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 #include <string.h>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 unsigned int Arguments::_addmods_count = 0;
90 #if INCLUDE_JVMCI
91 bool Arguments::_jvmci_module_added = false;
92 #endif
93 char* Arguments::_java_command = nullptr;
94 SystemProperty* Arguments::_system_properties = nullptr;
95 size_t Arguments::_conservative_max_heap_alignment = 0;
96 Arguments::Mode Arguments::_mode = _mixed;
97 const char* Arguments::_java_vendor_url_bug = nullptr;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 bool Arguments::_executing_unit_tests = false;
100
101 // These parameters are reset in method parse_vm_init_args()
102 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
103 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
104 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
105 bool Arguments::_ClipInlining = ClipInlining;
106 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
107
108 bool Arguments::_enable_preview = false;
109 bool Arguments::_has_jdwp_agent = false;
110
111 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
112
113 // These are not set by the JDK's built-in launchers, but they can be set by
114 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
115 // JavaVMOption in jni.h.
116 abort_hook_t Arguments::_abort_hook = nullptr;
117 exit_hook_t Arguments::_exit_hook = nullptr;
118 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
119
120
121 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
122 SystemProperty *Arguments::_java_library_path = nullptr;
123 SystemProperty *Arguments::_java_home = nullptr;
124 SystemProperty *Arguments::_java_class_path = nullptr;
125 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
126 SystemProperty *Arguments::_vm_info = nullptr;
127
128 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
129 PathString *Arguments::_boot_class_path = nullptr;
130 bool Arguments::_has_jimage = false;
131
132 char* Arguments::_ext_dirs = nullptr;
133
134 // True if -Xshare:auto option was specified.
135 static bool xshare_auto_cmd_line = false;
136
137 // True if -Xint/-Xmixed/-Xcomp were specified
138 static bool mode_flag_cmd_line = false;
139
140 struct VMInitArgsGroup {
141 const JavaVMInitArgs* _args;
142 JVMFlagOrigin _origin;
143 };
144
145 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
146 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
147 if (new_value == nullptr) {
148 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
149 return false;
150 }
151 if (_value != nullptr) {
152 FreeHeap(_value);
153 }
154 _value = new_value;
155 strcpy(_value, value);
156 return true;
157 }
158
159 void PathString::append_value(const char *value) {
160 char *sp;
161 size_t len = 0;
162 if (value != nullptr) {
163 len = strlen(value);
164 if (_value != nullptr) {
165 len += strlen(_value);
166 }
167 sp = AllocateHeap(len+2, mtArguments);
168 assert(sp != nullptr, "Unable to allocate space for new append path value");
169 if (sp != nullptr) {
170 if (_value != nullptr) {
171 strcpy(sp, _value);
172 strcat(sp, os::path_separator());
173 strcat(sp, value);
174 FreeHeap(_value);
175 } else {
176 strcpy(sp, value);
177 }
178 _value = sp;
179 }
180 }
181 }
182
183 PathString::PathString(const char* value) {
184 if (value == nullptr) {
185 _value = nullptr;
186 } else {
187 _value = AllocateHeap(strlen(value)+1, mtArguments);
188 strcpy(_value, value);
189 }
190 }
191
192 PathString::~PathString() {
193 if (_value != nullptr) {
194 FreeHeap(_value);
195 _value = nullptr;
196 }
197 }
198
199 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
200 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
201 size_t len = strlen(module_name) + 1;
202 _module_name = AllocateHeap(len, mtInternal);
203 strncpy(_module_name, module_name, len); // copy the trailing null
204 _path = new PathString(path);
205 }
206
207 ModulePatchPath::~ModulePatchPath() {
208 if (_module_name != nullptr) {
209 FreeHeap(_module_name);
210 _module_name = nullptr;
211 }
212 if (_path != nullptr) {
213 delete _path;
214 _path = nullptr;
215 }
216 }
217
218 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
219 if (key == nullptr) {
220 _key = nullptr;
221 } else {
222 _key = AllocateHeap(strlen(key)+1, mtArguments);
223 strcpy(_key, key);
224 }
225 _next = nullptr;
226 _internal = internal;
227 _writeable = writeable;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = nullptr;
246 bool result = match_option(option, name, &tail);
247 if (tail != nullptr && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != nullptr; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 #if INCLUDE_JFR
270 static bool _has_jfr_option = false; // is using JFR
271
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != nullptr, "invariant");
275 char* tail = nullptr;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_start_flight_recording_option(option, tail);
279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
280 _has_jfr_option = true;
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284 }
285
286 bool Arguments::has_jfr_option() {
287 return _has_jfr_option;
288 }
289 #endif
290
291 static void logOption(const char* opt) {
292 if (PrintVMOptions) {
293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
294 }
295 }
296
297 bool needs_module_property_warning = false;
298
299 #define MODULE_PROPERTY_PREFIX "jdk.module."
300 #define MODULE_PROPERTY_PREFIX_LEN 11
301 #define ADDEXPORTS "addexports"
302 #define ADDEXPORTS_LEN 10
303 #define ADDREADS "addreads"
304 #define ADDREADS_LEN 8
305 #define ADDOPENS "addopens"
306 #define ADDOPENS_LEN 8
307 #define PATCH "patch"
308 #define PATCH_LEN 5
309 #define ADDMODS "addmods"
310 #define ADDMODS_LEN 7
311 #define LIMITMODS "limitmods"
312 #define LIMITMODS_LEN 9
313 #define PATH "path"
314 #define PATH_LEN 4
315 #define UPGRADE_PATH "upgrade.path"
316 #define UPGRADE_PATH_LEN 12
317 #define ENABLE_NATIVE_ACCESS "enable.native.access"
318 #define ENABLE_NATIVE_ACCESS_LEN 20
319 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
320 #define ILLEGAL_NATIVE_ACCESS_LEN 21
321 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
322 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
323 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
324 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
325
326 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
327 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
328 return ((strncmp(option, property, len) == 0) &&
329 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
330 }
331
332 // Return true if property starts with "jdk.module." and its ensuing chars match
333 // any of the reserved module properties.
334 // property should be passed without the leading "-D".
335 bool Arguments::is_internal_module_property(const char* property) {
336 return internal_module_property_helper(property, false);
337 }
338
339 // Returns true if property is one of those recognized by is_internal_module_property() but
340 // is not supported by CDS archived full module graph.
341 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
342 return internal_module_property_helper(property, true);
343 }
344
345 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
346 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
347 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
348 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
349 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
350 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
351 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
352 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
353 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
354 return true;
355 }
356
357 if (!check_for_cds) {
358 // CDS notes: these properties are supported by CDS archived full module graph.
359 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
360 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
361 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
362 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
363 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
364 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
365 return true;
366 }
367 }
368 }
369 return false;
370 }
371
372 // Process java launcher properties.
373 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
374 // See if sun.java.launcher is defined.
375 // Must do this before setting up other system properties,
376 // as some of them may depend on launcher type.
377 for (int index = 0; index < args->nOptions; index++) {
378 const JavaVMOption* option = args->options + index;
379 const char* tail;
380
381 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
382 process_java_launcher_argument(tail, option->extraInfo);
383 continue;
384 }
385 if (match_option(option, "-XX:+ExecutingUnitTests")) {
386 _executing_unit_tests = true;
387 continue;
388 }
389 }
390 }
391
392 // Initialize system properties key and value.
393 void Arguments::init_system_properties() {
394
395 // Set up _boot_class_path which is not a property but
396 // relies heavily on argument processing and the jdk.boot.class.path.append
397 // property. It is used to store the underlying boot class path.
398 _boot_class_path = new PathString(nullptr);
399
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
401 "Java Virtual Machine Specification", false));
402 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
403 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
404 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
405
406 // Initialize the vm.info now, but it will need updating after argument parsing.
407 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
408
409 // Following are JVMTI agent writable properties.
410 // Properties values are set to nullptr and they are
411 // os specific they are initialized in os::init_system_properties_values().
412 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
413 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
414 _java_home = new SystemProperty("java.home", nullptr, true);
415 _java_class_path = new SystemProperty("java.class.path", "", true);
416 // jdk.boot.class.path.append is a non-writeable, internal property.
417 // It can only be set by either:
418 // - -Xbootclasspath/a:
419 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
420 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
421
422 // Add to System Property list.
423 PropertyList_add(&_system_properties, _sun_boot_library_path);
424 PropertyList_add(&_system_properties, _java_library_path);
425 PropertyList_add(&_system_properties, _java_home);
426 PropertyList_add(&_system_properties, _java_class_path);
427 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
428 PropertyList_add(&_system_properties, _vm_info);
429
430 // Set OS specific system properties values
431 os::init_system_properties_values();
432 }
433
434 // Update/Initialize System properties after JDK version number is known
435 void Arguments::init_version_specific_system_properties() {
436 enum { bufsz = 16 };
437 char buffer[bufsz];
438 const char* spec_vendor = "Oracle Corporation";
439 uint32_t spec_version = JDK_Version::current().major_version();
440
441 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
442
443 PropertyList_add(&_system_properties,
444 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
445 PropertyList_add(&_system_properties,
446 new SystemProperty("java.vm.specification.version", buffer, false));
447 PropertyList_add(&_system_properties,
448 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
449 }
450
451 /*
452 * -XX argument processing:
453 *
454 * -XX arguments are defined in several places, such as:
455 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
456 * -XX arguments are parsed in parse_argument().
457 * -XX argument bounds checking is done in check_vm_args_consistency().
458 *
459 * Over time -XX arguments may change. There are mechanisms to handle common cases:
460 *
461 * ALIASED: An option that is simply another name for another option. This is often
462 * part of the process of deprecating a flag, but not all aliases need
463 * to be deprecated.
464 *
465 * Create an alias for an option by adding the old and new option names to the
466 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
467 *
468 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
469 * support may be removed in the future. Both regular and aliased options may be
470 * deprecated.
471 *
472 * Add a deprecation warning for an option (or alias) by adding an entry in the
473 * "special_jvm_flags" table and setting the "deprecated_in" field.
474 * Often an option "deprecated" in one major release will
475 * be made "obsolete" in the next. In this case the entry should also have its
476 * "obsolete_in" field set.
477 *
478 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
479 * on the command line. A warning is printed to let the user know that option might not
480 * be accepted in the future.
481 *
482 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
483 * table and setting the "obsolete_in" field.
484 *
485 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
486 * to the current JDK version. The system will flatly refuse to admit the existence of
487 * the flag. This allows a flag to die automatically over JDK releases.
488 *
489 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
490 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
491 * - Newly obsolete or expired deprecated options should have their global variable
492 * definitions removed (from globals.hpp, etc) and related implementations removed.
493 *
494 * Recommended approach for removing options:
495 *
496 * To remove options commonly used by customers (e.g. product -XX options), use
497 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
498 *
499 * To remove internal options (e.g. diagnostic, experimental, develop options), use
500 * a 2-step model adding major release numbers to the obsolete and expire columns.
501 *
502 * To change the name of an option, use the alias table as well as a 2-step
503 * model adding major release numbers to the deprecate and expire columns.
504 * Think twice about aliasing commonly used customer options.
505 *
506 * There are times when it is appropriate to leave a future release number as undefined.
507 *
508 * Tests: Aliases should be tested in VMAliasOptions.java.
509 * Deprecated options should be tested in VMDeprecatedOptions.java.
510 */
511
512 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
513 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
514 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
515 // the command-line as usual, but will issue a warning.
516 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
517 // the command-line, while issuing a warning and ignoring the flag value.
518 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
519 // existence of the flag.
520 //
521 // MANUAL CLEANUP ON JDK VERSION UPDATES:
522 // This table ensures that the handling of options will update automatically when the JDK
523 // version is incremented, but the source code needs to be cleanup up manually:
524 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
525 // variable should be removed, as well as users of the variable.
526 // - As "deprecated" options age into "obsolete" options, move the entry into the
527 // "Obsolete Flags" section of the table.
528 // - All expired options should be removed from the table.
529 static SpecialFlag const special_jvm_flags[] = {
530 // -------------- Deprecated Flags --------------
531 // --- Non-alias flags - sorted by obsolete_in then expired_in:
532 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
535 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
536 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
537 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
538 #ifdef _LP64
539 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
540 #endif
541 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
542 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
543 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
544 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
545 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
546
547 // -------------- Obsolete Flags - sorted by expired_in --------------
548
549 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
550 #if defined(AARCH64)
551 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
552 #endif
553
554 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
555 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
556 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
557 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
558 { "NewSizeThreadIncrease", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
559
560 #ifdef ASSERT
561 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
562 #endif
563
564 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
565 // These entries will generate build errors. Their purpose is to test the macros.
566 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
567 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
568 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
569 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
570 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
571 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
572 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
573 #endif
574
575 { nullptr, JDK_Version(0), JDK_Version(0) }
576 };
577
578 // Flags that are aliases for other flags.
579 typedef struct {
580 const char* alias_name;
581 const char* real_name;
582 } AliasedFlag;
583
584 static AliasedFlag const aliased_jvm_flags[] = {
585 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
586 { nullptr, nullptr}
587 };
588
589 // Return true if "v" is less than "other", where "other" may be "undefined".
590 static bool version_less_than(JDK_Version v, JDK_Version other) {
591 assert(!v.is_undefined(), "must be defined");
592 if (!other.is_undefined() && v.compare(other) >= 0) {
593 return false;
594 } else {
595 return true;
596 }
597 }
598
599 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
600 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
601 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
602 flag = special_jvm_flags[i];
603 return true;
604 }
605 }
606 return false;
607 }
608
609 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
610 assert(version != nullptr, "Must provide a version buffer");
611 SpecialFlag flag;
612 if (lookup_special_flag(flag_name, flag)) {
613 if (!flag.obsolete_in.is_undefined()) {
614 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
615 *version = flag.obsolete_in;
616 // This flag may have been marked for obsoletion in this version, but we may not
617 // have actually removed it yet. Rather than ignoring it as soon as we reach
618 // this version we allow some time for the removal to happen. So if the flag
619 // still actually exists we process it as normal, but issue an adjusted warning.
620 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
621 if (real_flag != nullptr) {
622 char version_str[256];
623 version->to_string(version_str, sizeof(version_str));
624 warning("Temporarily processing option %s; support is scheduled for removal in %s",
625 flag_name, version_str);
626 return false;
627 }
628 return true;
629 }
630 }
631 }
632 return false;
633 }
634
635 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
636 assert(version != nullptr, "Must provide a version buffer");
637 SpecialFlag flag;
638 if (lookup_special_flag(flag_name, flag)) {
639 if (!flag.deprecated_in.is_undefined()) {
640 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
641 version_less_than(JDK_Version::current(), flag.expired_in)) {
642 *version = flag.deprecated_in;
643 return 1;
644 } else {
645 return -1;
646 }
647 }
648 }
649 return 0;
650 }
651
652 const char* Arguments::real_flag_name(const char *flag_name) {
653 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
654 const AliasedFlag& flag_status = aliased_jvm_flags[i];
655 if (strcmp(flag_status.alias_name, flag_name) == 0) {
656 return flag_status.real_name;
657 }
658 }
659 return flag_name;
660 }
661
662 #ifdef ASSERT
663 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
664 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
665 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
666 return true;
667 }
668 }
669 return false;
670 }
671
672 // Verifies the correctness of the entries in the special_jvm_flags table.
673 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
674 // version being earlier than the deprecation version, then a warning is issued
675 // and verification fails - by returning false. If it is detected that the table
676 // is out of date, with respect to the current version, then ideally a warning is
677 // issued but verification does not fail. This allows the VM to operate when the
678 // version is first updated, without needing to update all the impacted flags at
679 // the same time. In practice we can't issue the warning immediately when the version
680 // is updated as it occurs for every test and some tests are not prepared to handle
681 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
682 // if the check_globals flag is true, and in addition allow a grace period and only
683 // check for stale flags when we hit build 25 (which is far enough into the 6 month
684 // release cycle that all flag updates should have been processed, whilst still
685 // leaving time to make the change before RDP2).
686 // We use a gtest to call this, passing true, so that we can detect stale flags before
687 // the end of the release cycle.
688
689 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
690
691 bool Arguments::verify_special_jvm_flags(bool check_globals) {
692 bool success = true;
693 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
694 const SpecialFlag& flag = special_jvm_flags[i];
695 if (lookup_special_flag(flag.name, i)) {
696 warning("Duplicate special flag declaration \"%s\"", flag.name);
697 success = false;
698 }
699 if (flag.deprecated_in.is_undefined() &&
700 flag.obsolete_in.is_undefined()) {
701 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
702 success = false;
703 }
704
705 if (!flag.deprecated_in.is_undefined()) {
706 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
707 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
708 success = false;
709 }
710
711 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
712 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
713 success = false;
714 }
715 }
716
717 if (!flag.obsolete_in.is_undefined()) {
718 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
719 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
720 success = false;
721 }
722
723 // if flag has become obsolete it should not have a "globals" flag defined anymore.
724 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
725 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
726 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
727 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
728 success = false;
729 }
730 }
731
732 } else if (!flag.expired_in.is_undefined()) {
733 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
734 success = false;
735 }
736
737 if (!flag.expired_in.is_undefined()) {
738 // if flag has become expired it should not have a "globals" flag defined anymore.
739 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
740 !version_less_than(JDK_Version::current(), flag.expired_in)) {
741 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
742 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
743 success = false;
744 }
745 }
746 }
747 }
748 return success;
749 }
750 #endif
751
752 bool Arguments::atojulong(const char *s, julong* result) {
753 return parse_integer(s, result);
754 }
755
756 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
757 if (size < min_size) return arg_too_small;
758 if (size > max_size) return arg_too_big;
759 return arg_in_range;
760 }
761
762 // Describe an argument out of range error
763 void Arguments::describe_range_error(ArgsRange errcode) {
764 switch(errcode) {
765 case arg_too_big:
766 jio_fprintf(defaultStream::error_stream(),
767 "The specified size exceeds the maximum "
768 "representable size.\n");
769 break;
770 case arg_too_small:
771 case arg_unreadable:
772 case arg_in_range:
773 // do nothing for now
774 break;
775 default:
776 ShouldNotReachHere();
777 }
778 }
779
780 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
781 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
782 return true;
783 } else {
784 return false;
785 }
786 }
787
788 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
789 // strtod allows leading whitespace, but our flag format does not.
790 if (*value == '\0' || isspace((unsigned char) *value)) {
791 return false;
792 }
793 char* end;
794 errno = 0;
795 double v = strtod(value, &end);
796 if ((errno != 0) || (*end != 0)) {
797 return false;
798 }
799 if (g_isnan(v) || !g_isfinite(v)) {
800 // Currently we cannot handle these special values.
801 return false;
802 }
803
804 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
805 return true;
806 }
807 return false;
808 }
809
810 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
811 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
812
813 if (flag->is_int()) {
814 int v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_int(flag, &v, origin);
817 }
818 } else if (flag->is_uint()) {
819 uint v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_uint(flag, &v, origin);
822 }
823 } else if (flag->is_intx()) {
824 intx v;
825 if (parse_integer(value, &v)) {
826 result = JVMFlagAccess::set_intx(flag, &v, origin);
827 }
828 } else if (flag->is_uintx()) {
829 uintx v;
830 if (parse_integer(value, &v)) {
831 result = JVMFlagAccess::set_uintx(flag, &v, origin);
832 }
833 } else if (flag->is_uint64_t()) {
834 uint64_t v;
835 if (parse_integer(value, &v)) {
836 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
837 }
838 } else if (flag->is_size_t()) {
839 size_t v;
840 if (parse_integer(value, &v)) {
841 result = JVMFlagAccess::set_size_t(flag, &v, origin);
842 }
843 }
844
845 return result == JVMFlag::SUCCESS;
846 }
847
848 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
849 if (value[0] == '\0') {
850 value = nullptr;
851 }
852 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
853 // Contract: JVMFlag always returns a pointer that needs freeing.
854 FREE_C_HEAP_ARRAY(char, value);
855 return true;
856 }
857
858 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
859 const char* old_value = "";
860 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
861 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
862 size_t new_len = strlen(new_value);
863 const char* value;
864 char* free_this_too = nullptr;
865 if (old_len == 0) {
866 value = new_value;
867 } else if (new_len == 0) {
868 value = old_value;
869 } else {
870 size_t length = old_len + 1 + new_len + 1;
871 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
872 // each new setting adds another LINE to the switch:
873 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
874 value = buf;
875 free_this_too = buf;
876 }
877 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
878 // JVMFlag always returns a pointer that needs freeing.
879 FREE_C_HEAP_ARRAY(char, value);
880 // JVMFlag made its own copy, so I must delete my own temp. buffer.
881 FREE_C_HEAP_ARRAY(char, free_this_too);
882 return true;
883 }
884
885 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
886 const char* real_name = real_flag_name(arg);
887 JDK_Version since = JDK_Version();
888 switch (is_deprecated_flag(arg, &since)) {
889 case -1: {
890 // Obsolete or expired, so don't process normally,
891 // but allow for an obsolete flag we're still
892 // temporarily allowing.
893 if (!is_obsolete_flag(arg, &since)) {
894 return real_name;
895 }
896 // Note if we're not considered obsolete then we can't be expired either
897 // as obsoletion must come first.
898 return nullptr;
899 }
900 case 0:
901 return real_name;
902 case 1: {
903 char version[256];
904 since.to_string(version, sizeof(version));
905 if (real_name != arg) {
906 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
907 arg, version, real_name);
908 } else {
909 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
910 arg, version);
911 }
912 return real_name;
913 }
914 }
915 ShouldNotReachHere();
916 return nullptr;
917 }
918
919 #define BUFLEN 255
920
921 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
922 char name_copied[BUFLEN+1];
923 if (name[name_length] != 0) {
924 if (name_length > BUFLEN) {
925 return nullptr;
926 } else {
927 strncpy(name_copied, name, name_length);
928 name_copied[name_length] = '\0';
929 name = name_copied;
930 }
931 }
932
933 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
934 if (real_name == nullptr) {
935 return nullptr;
936 }
937 JVMFlag* flag = JVMFlag::find_flag(real_name);
938 return flag;
939 }
940
941 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
942 bool is_bool = false;
943 bool bool_val = false;
944 char c = *arg;
945 if (c == '+' || c == '-') {
946 is_bool = true;
947 bool_val = (c == '+');
948 arg++;
949 }
950
951 const char* name = arg;
952 while (true) {
953 c = *arg;
954 if (isalnum(c) || (c == '_')) {
955 ++arg;
956 } else {
957 break;
958 }
959 }
960
961 size_t name_len = size_t(arg - name);
962 if (name_len == 0) {
963 return false;
964 }
965
966 JVMFlag* flag = find_jvm_flag(name, name_len);
967 if (flag == nullptr) {
968 return false;
969 }
970
971 if (is_bool) {
972 if (*arg != 0) {
973 // Error -- extra characters such as -XX:+BoolFlag=123
974 return false;
975 }
976 return set_bool_flag(flag, bool_val, origin);
977 }
978
979 if (arg[0] == '=') {
980 const char* value = arg + 1;
981 if (flag->is_ccstr()) {
982 if (flag->ccstr_accumulates()) {
983 return append_to_string_flag(flag, value, origin);
984 } else {
985 return set_string_flag(flag, value, origin);
986 }
987 } else if (flag->is_double()) {
988 return set_fp_numeric_flag(flag, value, origin);
989 } else {
990 return set_numeric_flag(flag, value, origin);
991 }
992 }
993
994 if (arg[0] == ':' && arg[1] == '=') {
995 // -XX:Foo:=xxx will reset the string flag to the given value.
996 const char* value = arg + 2;
997 return set_string_flag(flag, value, origin);
998 }
999
1000 return false;
1001 }
1002
1003 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1004 assert(bldarray != nullptr, "illegal argument");
1005
1006 if (arg == nullptr) {
1007 return;
1008 }
1009
1010 int new_count = *count + 1;
1011
1012 // expand the array and add arg to the last element
1013 if (*bldarray == nullptr) {
1014 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1015 } else {
1016 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1017 }
1018 (*bldarray)[*count] = os::strdup_check_oom(arg);
1019 *count = new_count;
1020 }
1021
1022 void Arguments::build_jvm_args(const char* arg) {
1023 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1024 }
1025
1026 void Arguments::build_jvm_flags(const char* arg) {
1027 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1028 }
1029
1030 // utility function to return a string that concatenates all
1031 // strings in a given char** array
1032 const char* Arguments::build_resource_string(char** args, int count) {
1033 if (args == nullptr || count == 0) {
1034 return nullptr;
1035 }
1036 size_t length = 0;
1037 for (int i = 0; i < count; i++) {
1038 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1039 }
1040 char* s = NEW_RESOURCE_ARRAY(char, length);
1041 char* dst = s;
1042 for (int j = 0; j < count; j++) {
1043 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1044 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1045 dst += offset;
1046 length -= offset;
1047 }
1048 return (const char*) s;
1049 }
1050
1051 void Arguments::print_on(outputStream* st) {
1052 st->print_cr("VM Arguments:");
1053 if (num_jvm_flags() > 0) {
1054 st->print("jvm_flags: "); print_jvm_flags_on(st);
1055 st->cr();
1056 }
1057 if (num_jvm_args() > 0) {
1058 st->print("jvm_args: "); print_jvm_args_on(st);
1059 st->cr();
1060 }
1061 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1062 if (_java_class_path != nullptr) {
1063 char* path = _java_class_path->value();
1064 size_t len = strlen(path);
1065 st->print("java_class_path (initial): ");
1066 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1067 if (len == 0) {
1068 st->print_raw_cr("<not set>");
1069 } else {
1070 st->print_raw_cr(path, len);
1071 }
1072 }
1073 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1074 }
1075
1076 void Arguments::print_summary_on(outputStream* st) {
1077 // Print the command line. Environment variables that are helpful for
1078 // reproducing the problem are written later in the hs_err file.
1079 // flags are from setting file
1080 if (num_jvm_flags() > 0) {
1081 st->print_raw("Settings File: ");
1082 print_jvm_flags_on(st);
1083 st->cr();
1084 }
1085 // args are the command line and environment variable arguments.
1086 st->print_raw("Command Line: ");
1087 if (num_jvm_args() > 0) {
1088 print_jvm_args_on(st);
1089 }
1090 // this is the classfile and any arguments to the java program
1091 if (java_command() != nullptr) {
1092 st->print("%s", java_command());
1093 }
1094 st->cr();
1095 }
1096
1097 void Arguments::set_jvm_flags_file(const char *value) {
1098 if (_jvm_flags_file != nullptr) {
1099 os::free(_jvm_flags_file);
1100 }
1101 _jvm_flags_file = os::strdup_check_oom(value);
1102 }
1103
1104 void Arguments::print_jvm_flags_on(outputStream* st) {
1105 if (_num_jvm_flags > 0) {
1106 for (int i=0; i < _num_jvm_flags; i++) {
1107 st->print("%s ", _jvm_flags_array[i]);
1108 }
1109 }
1110 }
1111
1112 void Arguments::print_jvm_args_on(outputStream* st) {
1113 if (_num_jvm_args > 0) {
1114 for (int i=0; i < _num_jvm_args; i++) {
1115 st->print("%s ", _jvm_args_array[i]);
1116 }
1117 }
1118 }
1119
1120 bool Arguments::process_argument(const char* arg,
1121 jboolean ignore_unrecognized,
1122 JVMFlagOrigin origin) {
1123 JDK_Version since = JDK_Version();
1124
1125 if (parse_argument(arg, origin)) {
1126 return true;
1127 }
1128
1129 // Determine if the flag has '+', '-', or '=' characters.
1130 bool has_plus_minus = (*arg == '+' || *arg == '-');
1131 const char* const argname = has_plus_minus ? arg + 1 : arg;
1132
1133 size_t arg_len;
1134 const char* equal_sign = strchr(argname, '=');
1135 if (equal_sign == nullptr) {
1136 arg_len = strlen(argname);
1137 } else {
1138 arg_len = equal_sign - argname;
1139 }
1140
1141 // Only make the obsolete check for valid arguments.
1142 if (arg_len <= BUFLEN) {
1143 // Construct a string which consists only of the argument name without '+', '-', or '='.
1144 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1145 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1146 if (is_obsolete_flag(stripped_argname, &since)) {
1147 char version[256];
1148 since.to_string(version, sizeof(version));
1149 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1150 return true;
1151 }
1152 }
1153
1154 // For locked flags, report a custom error message if available.
1155 // Otherwise, report the standard unrecognized VM option.
1156 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1157 if (found_flag != nullptr) {
1158 char locked_message_buf[BUFLEN];
1159 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1160 if (strlen(locked_message_buf) != 0) {
1161 #ifdef PRODUCT
1162 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1163 if (ignore_unrecognized && mismatched) {
1164 return true;
1165 }
1166 #endif
1167 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1168 }
1169 if (found_flag->is_bool() && !has_plus_minus) {
1170 jio_fprintf(defaultStream::error_stream(),
1171 "Missing +/- setting for VM option '%s'\n", argname);
1172 } else if (!found_flag->is_bool() && has_plus_minus) {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "Unexpected +/- setting in VM option '%s'\n", argname);
1175 } else {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Improperly specified VM option '%s'\n", argname);
1178 }
1179 } else {
1180 if (ignore_unrecognized) {
1181 return true;
1182 }
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Unrecognized VM option '%s'\n", argname);
1185 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1186 if (fuzzy_matched != nullptr) {
1187 jio_fprintf(defaultStream::error_stream(),
1188 "Did you mean '%s%s%s'?\n",
1189 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1190 fuzzy_matched->name(),
1191 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1192 }
1193 }
1194
1195 // allow for commandline "commenting out" options like -XX:#+Verbose
1196 return arg[0] == '#';
1197 }
1198
1199 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1200 FILE* stream = os::fopen(file_name, "rb");
1201 if (stream == nullptr) {
1202 if (should_exist) {
1203 jio_fprintf(defaultStream::error_stream(),
1204 "Could not open settings file %s\n", file_name);
1205 return false;
1206 } else {
1207 return true;
1208 }
1209 }
1210
1211 char token[1024];
1212 size_t pos = 0;
1213
1214 bool in_white_space = true;
1215 bool in_comment = false;
1216 bool in_quote = false;
1217 char quote_c = 0;
1218 bool result = true;
1219
1220 int c_or_eof = getc(stream);
1221 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1222 // We have checked the c_or_eof for EOF. getc should only ever return the
1223 // EOF or an unsigned char converted to an int. We cast down to a char to
1224 // avoid the char to int promotions we would otherwise do in the comparisons
1225 // below (which would be incorrect if we ever compared to a non-ascii char),
1226 // and the int to char conversions we would otherwise do in the assignments.
1227 const char c = static_cast<char>(c_or_eof);
1228 if (in_white_space) {
1229 if (in_comment) {
1230 if (c == '\n') in_comment = false;
1231 } else {
1232 if (c == '#') in_comment = true;
1233 else if (!isspace((unsigned char) c)) {
1234 in_white_space = false;
1235 token[pos++] = c;
1236 }
1237 }
1238 } else {
1239 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1240 // token ends at newline, or at unquoted whitespace
1241 // this allows a way to include spaces in string-valued options
1242 token[pos] = '\0';
1243 logOption(token);
1244 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1245 build_jvm_flags(token);
1246 pos = 0;
1247 in_white_space = true;
1248 in_quote = false;
1249 } else if (!in_quote && (c == '\'' || c == '"')) {
1250 in_quote = true;
1251 quote_c = c;
1252 } else if (in_quote && (c == quote_c)) {
1253 in_quote = false;
1254 } else {
1255 token[pos++] = c;
1256 }
1257 }
1258 c_or_eof = getc(stream);
1259 }
1260 if (pos > 0) {
1261 token[pos] = '\0';
1262 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1263 build_jvm_flags(token);
1264 }
1265 fclose(stream);
1266 return result;
1267 }
1268
1269 //=============================================================================================================
1270 // Parsing of properties (-D)
1271
1272 const char* Arguments::get_property(const char* key) {
1273 return PropertyList_get_value(system_properties(), key);
1274 }
1275
1276 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1277 const char* eq = strchr(prop, '=');
1278 const char* key;
1279 const char* value = "";
1280
1281 if (eq == nullptr) {
1282 // property doesn't have a value, thus use passed string
1283 key = prop;
1284 } else {
1285 // property have a value, thus extract it and save to the
1286 // allocated string
1287 size_t key_len = eq - prop;
1288 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1289
1290 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1291 key = tmp_key;
1292
1293 value = &prop[key_len + 1];
1294 }
1295
1296 if (internal == ExternalProperty) {
1297 CDSConfig::check_incompatible_property(key, value);
1298 }
1299
1300 if (strcmp(key, "java.compiler") == 0) {
1301 // we no longer support java.compiler system property, log a warning and let it get
1302 // passed to Java, like any other system property
1303 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1304 // for applications using NONE or empty value, log a more informative message
1305 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1306 } else {
1307 warning("The java.compiler system property is obsolete and no longer supported.");
1308 }
1309 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1310 // append is true, writable is true, internal is false
1311 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1312 WriteableProperty, ExternalProperty);
1313 } else {
1314 if (strcmp(key, "sun.java.command") == 0) {
1315 char *old_java_command = _java_command;
1316 _java_command = os::strdup_check_oom(value, mtArguments);
1317 if (old_java_command != nullptr) {
1318 os::free(old_java_command);
1319 }
1320 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1321 // If this property is set on the command line then its value will be
1322 // displayed in VM error logs as the URL at which to submit such logs.
1323 // Normally the URL displayed in error logs is different from the value
1324 // of this system property, so a different property should have been
1325 // used here, but we leave this as-is in case someone depends upon it.
1326 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1327 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1328 // its value without going through the property list or making a Java call.
1329 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1330 if (old_java_vendor_url_bug != nullptr) {
1331 os::free((void *)old_java_vendor_url_bug);
1332 }
1333 }
1334
1335 // Create new property and add at the end of the list
1336 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1337 }
1338
1339 if (key != prop) {
1340 // SystemProperty copy passed value, thus free previously allocated
1341 // memory
1342 FreeHeap((void *)key);
1343 }
1344
1345 return true;
1346 }
1347
1348 //===========================================================================================================
1349 // Setting int/mixed/comp mode flags
1350
1351 void Arguments::set_mode_flags(Mode mode) {
1352 // Set up default values for all flags.
1353 // If you add a flag to any of the branches below,
1354 // add a default value for it here.
1355 _mode = mode;
1356
1357 // Ensure Agent_OnLoad has the correct initial values.
1358 // This may not be the final mode; mode may change later in onload phase.
1359 PropertyList_unique_add(&_system_properties, "java.vm.info",
1360 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1361
1362 UseInterpreter = true;
1363 UseCompiler = true;
1364 UseLoopCounter = true;
1365
1366 // Default values may be platform/compiler dependent -
1367 // use the saved values
1368 ClipInlining = Arguments::_ClipInlining;
1369 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1370 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1371 BackgroundCompilation = Arguments::_BackgroundCompilation;
1372
1373 // Change from defaults based on mode
1374 switch (mode) {
1375 default:
1376 ShouldNotReachHere();
1377 break;
1378 case _int:
1379 UseCompiler = false;
1380 UseLoopCounter = false;
1381 AlwaysCompileLoopMethods = false;
1382 UseOnStackReplacement = false;
1383 break;
1384 case _mixed:
1385 // same as default
1386 break;
1387 case _comp:
1388 UseInterpreter = false;
1389 BackgroundCompilation = false;
1390 ClipInlining = false;
1391 break;
1392 }
1393 }
1394
1395 // Conflict: required to use shared spaces (-Xshare:on), but
1396 // incompatible command line options were chosen.
1397 void Arguments::no_shared_spaces(const char* message) {
1398 if (RequireSharedSpaces) {
1399 aot_log_error(aot)("%s is incompatible with other specified options.",
1400 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1401 if (CDSConfig::new_aot_flags_used()) {
1402 vm_exit_during_initialization("Unable to use AOT cache", message);
1403 } else {
1404 vm_exit_during_initialization("Unable to use shared archive", message);
1405 }
1406 } else {
1407 if (CDSConfig::new_aot_flags_used()) {
1408 log_warning(aot)("Unable to use AOT cache: %s", message);
1409 } else {
1410 aot_log_info(aot)("Unable to use shared archive: %s", message);
1411 }
1412 UseSharedSpaces = false;
1413 }
1414 }
1415
1416 static void set_object_alignment() {
1417 // Object alignment.
1418 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1419 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1420 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1421 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1422 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1423 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1424
1425 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1426 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1427
1428 // Oop encoding heap max
1429 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1430 }
1431
1432 size_t Arguments::max_heap_for_compressed_oops() {
1433 // Avoid sign flip.
1434 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1435 // We need to fit both the null page and the heap into the memory budget, while
1436 // keeping alignment constraints of the heap. To guarantee the latter, as the
1437 // null page is located before the heap, we pad the null page to the conservative
1438 // maximum alignment that the GC may ever impose upon the heap.
1439 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1440 _conservative_max_heap_alignment);
1441
1442 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1443 NOT_LP64(ShouldNotReachHere(); return 0);
1444 }
1445
1446 void Arguments::set_use_compressed_oops() {
1447 #ifdef _LP64
1448 // MaxHeapSize is not set up properly at this point, but
1449 // the only value that can override MaxHeapSize if we are
1450 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1451 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1452
1453 if (max_heap_size <= max_heap_for_compressed_oops()) {
1454 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1455 FLAG_SET_ERGO(UseCompressedOops, true);
1456 }
1457 } else {
1458 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1459 warning("Max heap size too large for Compressed Oops");
1460 FLAG_SET_DEFAULT(UseCompressedOops, false);
1461 }
1462 }
1463 #endif // _LP64
1464 }
1465
1466 void Arguments::set_conservative_max_heap_alignment() {
1467 // The conservative maximum required alignment for the heap is the maximum of
1468 // the alignments imposed by several sources: any requirements from the heap
1469 // itself and the maximum page size we may run the VM with.
1470 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1471 _conservative_max_heap_alignment = MAX3(heap_alignment,
1472 os::vm_allocation_granularity(),
1473 os::max_page_size());
1474 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1475 }
1476
1477 jint Arguments::set_ergonomics_flags() {
1478 GCConfig::initialize();
1479
1480 set_conservative_max_heap_alignment();
1481
1482 #ifdef _LP64
1483 set_use_compressed_oops();
1484
1485 // Also checks that certain machines are slower with compressed oops
1486 // in vm_version initialization code.
1487 #endif // _LP64
1488
1489 return JNI_OK;
1490 }
1491
1492 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1493 // The AggressiveHeap check is a temporary workaround to avoid calling
1494 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1495 // selected. This works because AggressiveHeap implies UseParallelGC
1496 // where we know the ratio will be 1. Once the AggressiveHeap option is
1497 // removed, this can be cleaned up.
1498 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1499 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1500 size_t max_allocatable = os::commit_memory_limit();
1501
1502 return MIN2(limit, max_allocatable / fraction);
1503 }
1504
1505 // Use static initialization to get the default before parsing
1506 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1507
1508 static size_t clamp_by_size_t_max(uint64_t value) {
1509 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1510 }
1511
1512 void Arguments::set_heap_size() {
1513 // Check if the user has configured any limit on the amount of RAM we may use.
1514 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1515 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1516 !FLAG_IS_DEFAULT(InitialRAMPercentage);
1517
1518 // Limit the available memory if client emulation mode is enabled.
1519 const size_t avail_mem = CompilerConfig::should_set_client_emulation_mode_flags()
1520 ? 1ULL*G
1521 : os::physical_memory();
1522
1523 // If the maximum heap size has not been set with -Xmx, then set it as
1524 // fraction of the size of physical memory, respecting the maximum and
1525 // minimum sizes of the heap.
1526 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1527 uint64_t min_memory = (uint64_t)(((double)avail_mem * MinRAMPercentage) / 100);
1528 uint64_t max_memory = (uint64_t)(((double)avail_mem * MaxRAMPercentage) / 100);
1529
1530 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1531 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1532
1533 if (reasonable_min < MaxHeapSize) {
1534 // Small physical memory, so use a minimum fraction of it for the heap
1535 reasonable_max = reasonable_min;
1536 } else {
1537 // Not-small physical memory, so require a heap at least
1538 // as large as MaxHeapSize
1539 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1540 }
1541
1542 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1543 // Limit the heap size to ErgoHeapSizeLimit
1544 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1545 }
1546
1547 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1548
1549 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1550 // An initial heap size was specified on the command line,
1551 // so be sure that the maximum size is consistent. Done
1552 // after call to limit_heap_by_allocatable_memory because that
1553 // method might reduce the allocation size.
1554 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1555 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1556 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1557 }
1558
1559 #ifdef _LP64
1560 if (UseCompressedOops || UseCompressedClassPointers) {
1561 // HeapBaseMinAddress can be greater than default but not less than.
1562 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1563 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1564 // matches compressed oops printing flags
1565 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1566 "(%zuG) which is greater than value given %zu",
1567 DefaultHeapBaseMinAddress,
1568 DefaultHeapBaseMinAddress/G,
1569 HeapBaseMinAddress);
1570 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1571 }
1572 }
1573 }
1574
1575 if (UseCompressedOops) {
1576 uintptr_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1577 uintptr_t max_coop_heap = max_heap_for_compressed_oops();
1578
1579 // Limit the heap size to the maximum possible when using compressed oops
1580 if (heap_end < max_coop_heap) {
1581 // Heap should be above HeapBaseMinAddress to get zero based compressed
1582 // oops but it should be not less than default MaxHeapSize.
1583 max_coop_heap -= HeapBaseMinAddress;
1584 }
1585
1586 // If the user has configured any limit on the amount of RAM we may use,
1587 // then disable compressed oops if the calculated max exceeds max_coop_heap
1588 // and UseCompressedOops was not specified.
1589 if (reasonable_max > max_coop_heap) {
1590 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1591 log_debug(gc, heap, coops)("UseCompressedOops disabled due to "
1592 "max heap %zu > compressed oop heap %zu. "
1593 "Please check the setting of MaxRAMPercentage %5.2f.",
1594 reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1595 FLAG_SET_ERGO(UseCompressedOops, false);
1596 } else {
1597 reasonable_max = max_coop_heap;
1598 }
1599 }
1600 }
1601 #endif // _LP64
1602
1603 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1604 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1605 }
1606
1607 // If the minimum or initial heap_size have not been set or requested to be set
1608 // ergonomically, set them accordingly.
1609 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1610 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1611 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1612 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1613
1614 if (InitialHeapSize == 0) {
1615 uint64_t initial_memory = (uint64_t)(((double)avail_mem * InitialRAMPercentage) / 100);
1616 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1617 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1618
1619 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1620 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1621
1622 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1623 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1624 }
1625
1626 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1627 // synchronize with InitialHeapSize to avoid errors with the default value.
1628 if (MinHeapSize == 0) {
1629 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1630 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1631 }
1632 }
1633 }
1634
1635 // This option inspects the machine and attempts to set various
1636 // parameters to be optimal for long-running, memory allocation
1637 // intensive jobs. It is intended for machines with large
1638 // amounts of cpu and memory.
1639 jint Arguments::set_aggressive_heap_flags() {
1640 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1641 // VM, but we may not be able to represent the total physical memory
1642 // available (like having 8gb of memory on a box but using a 32bit VM).
1643 // Thus, we need to make sure we're using a julong for intermediate
1644 // calculations.
1645 julong initHeapSize;
1646 physical_memory_size_type phys_mem = os::physical_memory();
1647 julong total_memory = static_cast<julong>(phys_mem);
1648
1649 if (total_memory < (julong) 256 * M) {
1650 jio_fprintf(defaultStream::error_stream(),
1651 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1652 vm_exit(1);
1653 }
1654
1655 // The heap size is half of available memory, or (at most)
1656 // all of possible memory less 160mb (leaving room for the OS
1657 // when using ISM). This is the maximum; because adaptive sizing
1658 // is turned on below, the actual space used may be smaller.
1659
1660 initHeapSize = MIN2(total_memory / (julong) 2,
1661 total_memory - (julong) 160 * M);
1662
1663 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1664
1665 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1666 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1667 return JNI_EINVAL;
1668 }
1669 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1673 return JNI_EINVAL;
1674 }
1675 }
1676 if (FLAG_IS_DEFAULT(NewSize)) {
1677 // Make the young generation 3/8ths of the total heap.
1678 if (FLAG_SET_CMDLINE(NewSize,
1679 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1680 return JNI_EINVAL;
1681 }
1682 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1683 return JNI_EINVAL;
1684 }
1685 }
1686
1687 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1688 FLAG_SET_DEFAULT(UseLargePages, true);
1689 #endif
1690
1691 // Increase some data structure sizes for efficiency
1692 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1693 return JNI_EINVAL;
1694 }
1695 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1696 return JNI_EINVAL;
1697 }
1698
1699 // See the OldPLABSize comment below, but replace 'after promotion'
1700 // with 'after copying'. YoungPLABSize is the size of the survivor
1701 // space per-gc-thread buffers. The default is 4kw.
1702 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1703 return JNI_EINVAL;
1704 }
1705
1706 // OldPLABSize is the size of the buffers in the old gen that
1707 // UseParallelGC uses to promote live data that doesn't fit in the
1708 // survivor spaces. At any given time, there's one for each gc thread.
1709 // The default size is 1kw. These buffers are rarely used, since the
1710 // survivor spaces are usually big enough. For specjbb, however, there
1711 // are occasions when there's lots of live data in the young gen
1712 // and we end up promoting some of it. We don't have a definite
1713 // explanation for why bumping OldPLABSize helps, but the theory
1714 // is that a bigger PLAB results in retaining something like the
1715 // original allocation order after promotion, which improves mutator
1716 // locality. A minor effect may be that larger PLABs reduce the
1717 // number of PLAB allocation events during gc. The value of 8kw
1718 // was arrived at by experimenting with specjbb.
1719 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1720 return JNI_EINVAL;
1721 }
1722
1723 // Enable parallel GC and adaptive generation sizing
1724 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1725 return JNI_EINVAL;
1726 }
1727
1728 // Encourage steady state memory management
1729 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1730 return JNI_EINVAL;
1731 }
1732
1733 return JNI_OK;
1734 }
1735
1736 // This must be called after ergonomics.
1737 void Arguments::set_bytecode_flags() {
1738 if (!RewriteBytecodes) {
1739 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1740 }
1741 }
1742
1743 // Aggressive optimization flags
1744 jint Arguments::set_aggressive_opts_flags() {
1745 #ifdef COMPILER2
1746 if (AggressiveUnboxing) {
1747 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1748 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1749 } else if (!EliminateAutoBox) {
1750 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1751 AggressiveUnboxing = false;
1752 }
1753 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1754 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1755 } else if (!DoEscapeAnalysis) {
1756 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1757 AggressiveUnboxing = false;
1758 }
1759 }
1760 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1761 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1762 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1763 }
1764 // Feed the cache size setting into the JDK
1765 char buffer[1024];
1766 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1767 if (!add_property(buffer)) {
1768 return JNI_ENOMEM;
1769 }
1770 }
1771 #endif
1772
1773 return JNI_OK;
1774 }
1775
1776 //===========================================================================================================
1777
1778 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1779 if (_sun_java_launcher != _default_java_launcher) {
1780 os::free(const_cast<char*>(_sun_java_launcher));
1781 }
1782 _sun_java_launcher = os::strdup_check_oom(launcher);
1783 }
1784
1785 bool Arguments::created_by_java_launcher() {
1786 assert(_sun_java_launcher != nullptr, "property must have value");
1787 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1788 }
1789
1790 bool Arguments::executing_unit_tests() {
1791 return _executing_unit_tests;
1792 }
1793
1794 //===========================================================================================================
1795 // Parsing of main arguments
1796
1797 static unsigned int addreads_count = 0;
1798 static unsigned int addexports_count = 0;
1799 static unsigned int addopens_count = 0;
1800 static unsigned int patch_mod_count = 0;
1801 static unsigned int enable_native_access_count = 0;
1802 static unsigned int enable_final_field_mutation = 0;
1803 static bool patch_mod_javabase = false;
1804
1805 // Check the consistency of vm_init_args
1806 bool Arguments::check_vm_args_consistency() {
1807 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1808 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1809 return false;
1810 }
1811
1812 // Method for adding checks for flag consistency.
1813 // The intent is to warn the user of all possible conflicts,
1814 // before returning an error.
1815 // Note: Needs platform-dependent factoring.
1816 bool status = true;
1817
1818 if (TLABRefillWasteFraction == 0) {
1819 jio_fprintf(defaultStream::error_stream(),
1820 "TLABRefillWasteFraction should be a denominator, "
1821 "not %zu\n",
1822 TLABRefillWasteFraction);
1823 status = false;
1824 }
1825
1826 status = CompilerConfig::check_args_consistency(status);
1827 #if INCLUDE_JVMCI
1828 if (status && EnableJVMCI) {
1829 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1830 // was explicitly set on the command line or in the jimage.
1831 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1832 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1833 return false;
1834 }
1835 }
1836 }
1837 #endif
1838
1839 #if INCLUDE_JFR
1840 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1841 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1842 return false;
1843 }
1844 }
1845 #endif
1846
1847 #ifndef SUPPORT_RESERVED_STACK_AREA
1848 if (StackReservedPages != 0) {
1849 FLAG_SET_CMDLINE(StackReservedPages, 0);
1850 warning("Reserved Stack Area not supported on this platform");
1851 }
1852 #endif
1853
1854 return status;
1855 }
1856
1857 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1858 const char* option_type) {
1859 if (ignore) return false;
1860
1861 const char* spacer = " ";
1862 if (option_type == nullptr) {
1863 option_type = ++spacer; // Set both to the empty string.
1864 }
1865
1866 jio_fprintf(defaultStream::error_stream(),
1867 "Unrecognized %s%soption: %s\n", option_type, spacer,
1868 option->optionString);
1869 return true;
1870 }
1871
1872 static const char* user_assertion_options[] = {
1873 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1874 };
1875
1876 static const char* system_assertion_options[] = {
1877 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1878 };
1879
1880 bool Arguments::parse_uint(const char* value,
1881 uint* uint_arg,
1882 uint min_size) {
1883 uint n;
1884 if (!parse_integer(value, &n)) {
1885 return false;
1886 }
1887 if (n >= min_size) {
1888 *uint_arg = n;
1889 return true;
1890 } else {
1891 return false;
1892 }
1893 }
1894
1895 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1896 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1897 CDSConfig::check_internal_module_property(prop_name, prop_value);
1898 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1899 char* property = AllocateHeap(prop_len, mtArguments);
1900 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1901 if (ret < 0 || ret >= (int)prop_len) {
1902 FreeHeap(property);
1903 return false;
1904 }
1905 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1906 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1907 // that multiple occurrences of the associated flag just causes the existing property value to be
1908 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1909 // to a property after we have finished flag processing.
1910 bool added = add_property(property, WriteableProperty, internal);
1911 FreeHeap(property);
1912 return added;
1913 }
1914
1915 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1916 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1917 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1918 const unsigned int props_count_limit = 1000;
1919 const int max_digits = 3;
1920 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1921
1922 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1923 if (count < props_count_limit) {
1924 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1925 char* property = AllocateHeap(prop_len, mtArguments);
1926 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1927 if (ret < 0 || ret >= (int)prop_len) {
1928 FreeHeap(property);
1929 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1930 return false;
1931 }
1932 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1933 FreeHeap(property);
1934 return added;
1935 }
1936
1937 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1938 return false;
1939 }
1940
1941 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1942 julong* long_arg,
1943 julong min_size,
1944 julong max_size) {
1945 if (!parse_integer(s, long_arg)) return arg_unreadable;
1946 return check_memory_size(*long_arg, min_size, max_size);
1947 }
1948
1949 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1950 // Save default settings for some mode flags
1951 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1952 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1953 Arguments::_ClipInlining = ClipInlining;
1954 Arguments::_BackgroundCompilation = BackgroundCompilation;
1955
1956 // Remember the default value of SharedBaseAddress.
1957 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1958
1959 // Setup flags for mixed which is the default
1960 set_mode_flags(_mixed);
1961
1962 jint result;
1963 for (int i = 0; i < all_args->length(); i++) {
1964 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1965 if (result != JNI_OK) {
1966 return result;
1967 }
1968 }
1969
1970 // Disable CDS for exploded image
1971 if (!has_jimage()) {
1972 no_shared_spaces("CDS disabled on exploded JDK");
1973 }
1974
1975 // We need to ensure processor and memory resources have been properly
1976 // configured - which may rely on arguments we just processed - before
1977 // doing the final argument processing. Any argument processing that
1978 // needs to know about processor and memory resources must occur after
1979 // this point.
1980
1981 os::init_container_support();
1982
1983 SystemMemoryBarrier::initialize();
1984
1985 // Do final processing now that all arguments have been parsed
1986 result = finalize_vm_init_args();
1987 if (result != JNI_OK) {
1988 return result;
1989 }
1990
1991 return JNI_OK;
1992 }
1993
1994 #if !INCLUDE_JVMTI || INCLUDE_CDS
1995 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1996 // represents a valid JDWP agent. is_path==true denotes that we
1997 // are dealing with -agentpath (case where name is a path), otherwise with
1998 // -agentlib
1999 static bool valid_jdwp_agent(char *name, bool is_path) {
2000 char *_name;
2001 const char *_jdwp = "jdwp";
2002 size_t _len_jdwp, _len_prefix;
2003
2004 if (is_path) {
2005 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2006 return false;
2007 }
2008
2009 _name++; // skip past last path separator
2010 _len_prefix = strlen(JNI_LIB_PREFIX);
2011
2012 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2013 return false;
2014 }
2015
2016 _name += _len_prefix;
2017 _len_jdwp = strlen(_jdwp);
2018
2019 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2020 _name += _len_jdwp;
2021 }
2022 else {
2023 return false;
2024 }
2025
2026 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2027 return false;
2028 }
2029
2030 return true;
2031 }
2032
2033 if (strcmp(name, _jdwp) == 0) {
2034 return true;
2035 }
2036
2037 return false;
2038 }
2039 #endif
2040
2041 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2042 // --patch-module=<module>=<file>(<pathsep><file>)*
2043 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2044 // Find the equal sign between the module name and the path specification
2045 const char* module_equal = strchr(patch_mod_tail, '=');
2046 if (module_equal == nullptr) {
2047 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2048 return JNI_ERR;
2049 } else {
2050 // Pick out the module name
2051 size_t module_len = module_equal - patch_mod_tail;
2052 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2053 if (module_name != nullptr) {
2054 memcpy(module_name, patch_mod_tail, module_len);
2055 *(module_name + module_len) = '\0';
2056 // The path piece begins one past the module_equal sign
2057 add_patch_mod_prefix(module_name, module_equal + 1);
2058 FREE_C_HEAP_ARRAY(char, module_name);
2059 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2060 return JNI_ENOMEM;
2061 }
2062 } else {
2063 return JNI_ENOMEM;
2064 }
2065 }
2066 return JNI_OK;
2067 }
2068
2069 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2070 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2071 // The min and max sizes match the values in globals.hpp, but scaled
2072 // with K. The values have been chosen so that alignment with page
2073 // size doesn't change the max value, which makes the conversions
2074 // back and forth between Xss value and ThreadStackSize value easier.
2075 // The values have also been chosen to fit inside a 32-bit signed type.
2076 const julong min_ThreadStackSize = 0;
2077 const julong max_ThreadStackSize = 1 * M;
2078
2079 // Make sure the above values match the range set in globals.hpp
2080 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2081 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2082 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2083
2084 const julong min_size = min_ThreadStackSize * K;
2085 const julong max_size = max_ThreadStackSize * K;
2086
2087 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2088
2089 julong size = 0;
2090 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2091 if (errcode != arg_in_range) {
2092 bool silent = (option == nullptr); // Allow testing to silence error messages
2093 if (!silent) {
2094 jio_fprintf(defaultStream::error_stream(),
2095 "Invalid thread stack size: %s\n", option->optionString);
2096 describe_range_error(errcode);
2097 }
2098 return JNI_EINVAL;
2099 }
2100
2101 // Internally track ThreadStackSize in units of 1024 bytes.
2102 const julong size_aligned = align_up(size, K);
2103 assert(size <= size_aligned,
2104 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2105 size, size_aligned);
2106
2107 const julong size_in_K = size_aligned / K;
2108 assert(size_in_K < (julong)max_intx,
2109 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2110 size_in_K);
2111
2112 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2113 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2114 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2115 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2116 max_expanded, size_in_K);
2117
2118 *out_ThreadStackSize = (intx)size_in_K;
2119
2120 return JNI_OK;
2121 }
2122
2123 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2124 // For match_option to return remaining or value part of option string
2125 const char* tail;
2126
2127 // iterate over arguments
2128 for (int index = 0; index < args->nOptions; index++) {
2129 bool is_absolute_path = false; // for -agentpath vs -agentlib
2130
2131 const JavaVMOption* option = args->options + index;
2132
2133 if (!match_option(option, "-Djava.class.path", &tail) &&
2134 !match_option(option, "-Dsun.java.command", &tail) &&
2135 !match_option(option, "-Dsun.java.launcher", &tail)) {
2136
2137 // add all jvm options to the jvm_args string. This string
2138 // is used later to set the java.vm.args PerfData string constant.
2139 // the -Djava.class.path and the -Dsun.java.command options are
2140 // omitted from jvm_args string as each have their own PerfData
2141 // string constant object.
2142 build_jvm_args(option->optionString);
2143 }
2144
2145 // -verbose:[class/module/gc/jni]
2146 if (match_option(option, "-verbose", &tail)) {
2147 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2148 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2149 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2150 } else if (!strcmp(tail, ":module")) {
2151 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2152 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2153 } else if (!strcmp(tail, ":gc")) {
2154 if (_legacyGCLogging.lastFlag == 0) {
2155 _legacyGCLogging.lastFlag = 1;
2156 }
2157 } else if (!strcmp(tail, ":jni")) {
2158 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2159 }
2160 // -da / -ea / -disableassertions / -enableassertions
2161 // These accept an optional class/package name separated by a colon, e.g.,
2162 // -da:java.lang.Thread.
2163 } else if (match_option(option, user_assertion_options, &tail, true)) {
2164 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2165 if (*tail == '\0') {
2166 JavaAssertions::setUserClassDefault(enable);
2167 } else {
2168 assert(*tail == ':', "bogus match by match_option()");
2169 JavaAssertions::addOption(tail + 1, enable);
2170 }
2171 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2172 } else if (match_option(option, system_assertion_options, &tail, false)) {
2173 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2174 JavaAssertions::setSystemClassDefault(enable);
2175 // -bootclasspath:
2176 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2177 jio_fprintf(defaultStream::output_stream(),
2178 "-Xbootclasspath is no longer a supported option.\n");
2179 return JNI_EINVAL;
2180 // -bootclasspath/a:
2181 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2182 Arguments::append_sysclasspath(tail);
2183 // -bootclasspath/p:
2184 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2185 jio_fprintf(defaultStream::output_stream(),
2186 "-Xbootclasspath/p is no longer a supported option.\n");
2187 return JNI_EINVAL;
2188 // -Xrun
2189 } else if (match_option(option, "-Xrun", &tail)) {
2190 if (tail != nullptr) {
2191 const char* pos = strchr(tail, ':');
2192 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2193 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2194 jio_snprintf(name, len + 1, "%s", tail);
2195
2196 char *options = nullptr;
2197 if(pos != nullptr) {
2198 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2199 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2200 }
2201 #if !INCLUDE_JVMTI
2202 if (strcmp(name, "jdwp") == 0) {
2203 jio_fprintf(defaultStream::error_stream(),
2204 "Debugging agents are not supported in this VM\n");
2205 return JNI_ERR;
2206 }
2207 #endif // !INCLUDE_JVMTI
2208 JvmtiAgentList::add_xrun(name, options, false);
2209 FREE_C_HEAP_ARRAY(char, name);
2210 FREE_C_HEAP_ARRAY(char, options);
2211 }
2212 } else if (match_option(option, "--add-reads=", &tail)) {
2213 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2214 return JNI_ENOMEM;
2215 }
2216 } else if (match_option(option, "--add-exports=", &tail)) {
2217 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2218 return JNI_ENOMEM;
2219 }
2220 } else if (match_option(option, "--add-opens=", &tail)) {
2221 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2222 return JNI_ENOMEM;
2223 }
2224 } else if (match_option(option, "--add-modules=", &tail)) {
2225 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2226 return JNI_ENOMEM;
2227 }
2228 #if INCLUDE_JVMCI
2229 if (!_jvmci_module_added) {
2230 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2231 if (jvmci_module != nullptr) {
2232 char before = *(jvmci_module - 1);
2233 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2234 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2235 FLAG_SET_DEFAULT(EnableJVMCI, true);
2236 _jvmci_module_added = true;
2237 }
2238 }
2239 }
2240 #endif
2241 } else if (match_option(option, "--enable-native-access=", &tail)) {
2242 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2243 return JNI_ENOMEM;
2244 }
2245 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2246 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2247 return JNI_ENOMEM;
2248 }
2249 } else if (match_option(option, "--limit-modules=", &tail)) {
2250 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2251 return JNI_ENOMEM;
2252 }
2253 } else if (match_option(option, "--module-path=", &tail)) {
2254 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2255 return JNI_ENOMEM;
2256 }
2257 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2258 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2259 return JNI_ENOMEM;
2260 }
2261 } else if (match_option(option, "--patch-module=", &tail)) {
2262 // --patch-module=<module>=<file>(<pathsep><file>)*
2263 int res = process_patch_mod_option(tail);
2264 if (res != JNI_OK) {
2265 return res;
2266 }
2267 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2268 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2269 return JNI_ENOMEM;
2270 }
2271 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2272 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2273 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2274 AddProperty, WriteableProperty, InternalProperty);
2275 } else {
2276 jio_fprintf(defaultStream::error_stream(),
2277 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2278 return JNI_ERR;
2279 }
2280 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2281 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2282 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2283 AddProperty, WriteableProperty, InternalProperty);
2284 } else {
2285 jio_fprintf(defaultStream::error_stream(),
2286 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2287 return JNI_ERR;
2288 }
2289 } else if (match_option(option, "--illegal-access=", &tail)) {
2290 char version[256];
2291 JDK_Version::jdk(17).to_string(version, sizeof(version));
2292 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2293 // -agentlib and -agentpath
2294 } else if (match_option(option, "-agentlib:", &tail) ||
2295 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2296 if(tail != nullptr) {
2297 const char* pos = strchr(tail, '=');
2298 char* name;
2299 if (pos == nullptr) {
2300 name = os::strdup_check_oom(tail, mtArguments);
2301 } else {
2302 size_t len = pos - tail;
2303 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2304 memcpy(name, tail, len);
2305 name[len] = '\0';
2306 }
2307
2308 char *options = nullptr;
2309 if(pos != nullptr) {
2310 options = os::strdup_check_oom(pos + 1, mtArguments);
2311 }
2312 #if !INCLUDE_JVMTI
2313 if (valid_jdwp_agent(name, is_absolute_path)) {
2314 jio_fprintf(defaultStream::error_stream(),
2315 "Debugging agents are not supported in this VM\n");
2316 return JNI_ERR;
2317 }
2318 #elif INCLUDE_CDS
2319 if (valid_jdwp_agent(name, is_absolute_path)) {
2320 _has_jdwp_agent = true;
2321 }
2322 #endif // !INCLUDE_JVMTI
2323 JvmtiAgentList::add(name, options, is_absolute_path);
2324 os::free(name);
2325 os::free(options);
2326 }
2327 // -javaagent
2328 } else if (match_option(option, "-javaagent:", &tail)) {
2329 #if !INCLUDE_JVMTI
2330 jio_fprintf(defaultStream::error_stream(),
2331 "Instrumentation agents are not supported in this VM\n");
2332 return JNI_ERR;
2333 #else
2334 if (tail != nullptr) {
2335 size_t length = strlen(tail) + 1;
2336 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2337 jio_snprintf(options, length, "%s", tail);
2338 JvmtiAgentList::add("instrument", options, false);
2339 FREE_C_HEAP_ARRAY(char, options);
2340
2341 // java agents need module java.instrument
2342 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2343 return JNI_ENOMEM;
2344 }
2345 }
2346 #endif // !INCLUDE_JVMTI
2347 // --enable_preview
2348 } else if (match_option(option, "--enable-preview")) {
2349 set_enable_preview();
2350 // -Xnoclassgc
2351 } else if (match_option(option, "-Xnoclassgc")) {
2352 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2353 return JNI_EINVAL;
2354 }
2355 // -Xbatch
2356 } else if (match_option(option, "-Xbatch")) {
2357 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2358 return JNI_EINVAL;
2359 }
2360 // -Xmn for compatibility with other JVM vendors
2361 } else if (match_option(option, "-Xmn", &tail)) {
2362 julong long_initial_young_size = 0;
2363 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2364 if (errcode != arg_in_range) {
2365 jio_fprintf(defaultStream::error_stream(),
2366 "Invalid initial young generation size: %s\n", option->optionString);
2367 describe_range_error(errcode);
2368 return JNI_EINVAL;
2369 }
2370 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2371 return JNI_EINVAL;
2372 }
2373 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2374 return JNI_EINVAL;
2375 }
2376 // -Xms
2377 } else if (match_option(option, "-Xms", &tail)) {
2378 julong size = 0;
2379 // an initial heap size of 0 means automatically determine
2380 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2381 if (errcode != arg_in_range) {
2382 jio_fprintf(defaultStream::error_stream(),
2383 "Invalid initial heap size: %s\n", option->optionString);
2384 describe_range_error(errcode);
2385 return JNI_EINVAL;
2386 }
2387 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2388 return JNI_EINVAL;
2389 }
2390 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2391 return JNI_EINVAL;
2392 }
2393 // -Xmx
2394 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2395 julong long_max_heap_size = 0;
2396 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2397 if (errcode != arg_in_range) {
2398 jio_fprintf(defaultStream::error_stream(),
2399 "Invalid maximum heap size: %s\n", option->optionString);
2400 describe_range_error(errcode);
2401 return JNI_EINVAL;
2402 }
2403 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2404 return JNI_EINVAL;
2405 }
2406 // Xmaxf
2407 } else if (match_option(option, "-Xmaxf", &tail)) {
2408 char* err;
2409 double dmaxf = strtod(tail, &err);
2410 if (*err != '\0' || *tail == '\0') {
2411 jio_fprintf(defaultStream::error_stream(),
2412 "Bad max heap free ratio: %s\n",
2413 option->optionString);
2414 return JNI_EINVAL;
2415 }
2416 if (dmaxf < 0.0 || dmaxf > 1.0) {
2417 jio_fprintf(defaultStream::error_stream(),
2418 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2419 option->optionString);
2420 return JNI_EINVAL;
2421 }
2422 const uintx umaxf = (uintx)(dmaxf * 100);
2423 if (MinHeapFreeRatio > umaxf) {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2426 tail, MinHeapFreeRatio / 100.0f);
2427 return JNI_EINVAL;
2428 }
2429 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2430 return JNI_EINVAL;
2431 }
2432 // Xminf
2433 } else if (match_option(option, "-Xminf", &tail)) {
2434 char* err;
2435 double dminf = strtod(tail, &err);
2436 if (*err != '\0' || *tail == '\0') {
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Bad min heap free ratio: %s\n",
2439 option->optionString);
2440 return JNI_EINVAL;
2441 }
2442 if (dminf < 0.0 || dminf > 1.0) {
2443 jio_fprintf(defaultStream::error_stream(),
2444 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2445 tail);
2446 return JNI_EINVAL;
2447 }
2448 const uintx uminf = (uintx)(dminf * 100);
2449 if (MaxHeapFreeRatio < uminf) {
2450 jio_fprintf(defaultStream::error_stream(),
2451 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2452 tail, MaxHeapFreeRatio / 100.0f);
2453 return JNI_EINVAL;
2454 }
2455 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2456 return JNI_EINVAL;
2457 }
2458 // -Xss
2459 } else if (match_option(option, "-Xss", &tail)) {
2460 intx value = 0;
2461 jint err = parse_xss(option, tail, &value);
2462 if (err != JNI_OK) {
2463 return err;
2464 }
2465 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2466 return JNI_EINVAL;
2467 }
2468 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2469 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2470 if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2471 warning("Option -Xmaxjitcodesize was deprecated in JDK 26 and will likely be removed in a future release.");
2472 }
2473 julong long_ReservedCodeCacheSize = 0;
2474
2475 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2476 if (errcode != arg_in_range) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "Invalid maximum code cache size: %s.\n", option->optionString);
2479 return JNI_EINVAL;
2480 }
2481 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2482 return JNI_EINVAL;
2483 }
2484 // -green
2485 } else if (match_option(option, "-green")) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Green threads support not available\n");
2488 return JNI_EINVAL;
2489 // -native
2490 } else if (match_option(option, "-native")) {
2491 // HotSpot always uses native threads, ignore silently for compatibility
2492 // -Xrs
2493 } else if (match_option(option, "-Xrs")) {
2494 // Classic/EVM option, new functionality
2495 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2496 return JNI_EINVAL;
2497 }
2498 // -Xprof
2499 } else if (match_option(option, "-Xprof")) {
2500 char version[256];
2501 // Obsolete in JDK 10
2502 JDK_Version::jdk(10).to_string(version, sizeof(version));
2503 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2504 // -Xinternalversion
2505 } else if (match_option(option, "-Xinternalversion")) {
2506 jio_fprintf(defaultStream::output_stream(), "%s\n",
2507 VM_Version::internal_vm_info_string());
2508 vm_exit(0);
2509 #ifndef PRODUCT
2510 // -Xprintflags
2511 } else if (match_option(option, "-Xprintflags")) {
2512 JVMFlag::printFlags(tty, false);
2513 vm_exit(0);
2514 #endif
2515 // -D
2516 } else if (match_option(option, "-D", &tail)) {
2517 const char* value;
2518 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2519 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2520 // abort if -Djava.endorsed.dirs is set
2521 jio_fprintf(defaultStream::output_stream(),
2522 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2523 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2524 return JNI_EINVAL;
2525 }
2526 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2527 *value != '\0' && strcmp(value, "\"\"") != 0) {
2528 // abort if -Djava.ext.dirs is set
2529 jio_fprintf(defaultStream::output_stream(),
2530 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2531 return JNI_EINVAL;
2532 }
2533 // Check for module related properties. They must be set using the modules
2534 // options. For example: use "--add-modules=java.sql", not
2535 // "-Djdk.module.addmods=java.sql"
2536 if (is_internal_module_property(option->optionString + 2)) {
2537 needs_module_property_warning = true;
2538 continue;
2539 }
2540 if (!add_property(tail)) {
2541 return JNI_ENOMEM;
2542 }
2543 // Out of the box management support
2544 if (match_option(option, "-Dcom.sun.management", &tail)) {
2545 #if INCLUDE_MANAGEMENT
2546 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2547 return JNI_EINVAL;
2548 }
2549 // management agent in module jdk.management.agent
2550 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2551 return JNI_ENOMEM;
2552 }
2553 #else
2554 jio_fprintf(defaultStream::output_stream(),
2555 "-Dcom.sun.management is not supported in this VM.\n");
2556 return JNI_ERR;
2557 #endif
2558 }
2559 // -Xint
2560 } else if (match_option(option, "-Xint")) {
2561 set_mode_flags(_int);
2562 mode_flag_cmd_line = true;
2563 // -Xmixed
2564 } else if (match_option(option, "-Xmixed")) {
2565 set_mode_flags(_mixed);
2566 mode_flag_cmd_line = true;
2567 // -Xcomp
2568 } else if (match_option(option, "-Xcomp")) {
2569 // for testing the compiler; turn off all flags that inhibit compilation
2570 set_mode_flags(_comp);
2571 mode_flag_cmd_line = true;
2572 // -Xshare:dump
2573 } else if (match_option(option, "-Xshare:dump")) {
2574 CDSConfig::enable_dumping_static_archive();
2575 CDSConfig::set_old_cds_flags_used();
2576 // -Xshare:on
2577 } else if (match_option(option, "-Xshare:on")) {
2578 UseSharedSpaces = true;
2579 RequireSharedSpaces = true;
2580 CDSConfig::set_old_cds_flags_used();
2581 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2582 } else if (match_option(option, "-Xshare:auto")) {
2583 UseSharedSpaces = true;
2584 RequireSharedSpaces = false;
2585 xshare_auto_cmd_line = true;
2586 CDSConfig::set_old_cds_flags_used();
2587 // -Xshare:off
2588 } else if (match_option(option, "-Xshare:off")) {
2589 UseSharedSpaces = false;
2590 RequireSharedSpaces = false;
2591 CDSConfig::set_old_cds_flags_used();
2592 // -Xverify
2593 } else if (match_option(option, "-Xverify", &tail)) {
2594 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2595 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2596 return JNI_EINVAL;
2597 }
2598 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2599 return JNI_EINVAL;
2600 }
2601 } else if (strcmp(tail, ":remote") == 0) {
2602 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2603 return JNI_EINVAL;
2604 }
2605 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2606 return JNI_EINVAL;
2607 }
2608 } else if (strcmp(tail, ":none") == 0) {
2609 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2610 return JNI_EINVAL;
2611 }
2612 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2613 return JNI_EINVAL;
2614 }
2615 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2616 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2617 return JNI_EINVAL;
2618 }
2619 // -Xdebug
2620 } else if (match_option(option, "-Xdebug")) {
2621 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2622 } else if (match_option(option, "-Xloggc:", &tail)) {
2623 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2624 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2625 _legacyGCLogging.lastFlag = 2;
2626 _legacyGCLogging.file = os::strdup_check_oom(tail);
2627 } else if (match_option(option, "-Xlog", &tail)) {
2628 bool ret = false;
2629 if (strcmp(tail, ":help") == 0) {
2630 fileStream stream(defaultStream::output_stream());
2631 LogConfiguration::print_command_line_help(&stream);
2632 vm_exit(0);
2633 } else if (strcmp(tail, ":disable") == 0) {
2634 LogConfiguration::disable_logging();
2635 ret = true;
2636 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2637 const char* async_tail = tail + strlen(":async");
2638 ret = LogConfiguration::parse_async_argument(async_tail);
2639 } else if (*tail == '\0') {
2640 ret = LogConfiguration::parse_command_line_arguments();
2641 assert(ret, "-Xlog without arguments should never fail to parse");
2642 } else if (*tail == ':') {
2643 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2644 }
2645 if (ret == false) {
2646 jio_fprintf(defaultStream::error_stream(),
2647 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2648 tail);
2649 return JNI_EINVAL;
2650 }
2651 // JNI hooks
2652 } else if (match_option(option, "-Xcheck", &tail)) {
2653 if (!strcmp(tail, ":jni")) {
2654 #if !INCLUDE_JNI_CHECK
2655 warning("JNI CHECKING is not supported in this VM");
2656 #else
2657 CheckJNICalls = true;
2658 #endif // INCLUDE_JNI_CHECK
2659 } else if (is_bad_option(option, args->ignoreUnrecognized,
2660 "check")) {
2661 return JNI_EINVAL;
2662 }
2663 } else if (match_option(option, "vfprintf")) {
2664 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2665 } else if (match_option(option, "exit")) {
2666 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2667 } else if (match_option(option, "abort")) {
2668 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2669 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2670 // and the last option wins.
2671 } else if (match_option(option, "-XX:+NeverTenure")) {
2672 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2673 return JNI_EINVAL;
2674 }
2675 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2679 return JNI_EINVAL;
2680 }
2681 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2682 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2683 return JNI_EINVAL;
2684 }
2685 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2689 return JNI_EINVAL;
2690 }
2691 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2692 uint max_tenuring_thresh = 0;
2693 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2694 jio_fprintf(defaultStream::error_stream(),
2695 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2696 return JNI_EINVAL;
2697 }
2698
2699 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2700 return JNI_EINVAL;
2701 }
2702
2703 if (MaxTenuringThreshold == 0) {
2704 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2708 return JNI_EINVAL;
2709 }
2710 } else {
2711 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2715 return JNI_EINVAL;
2716 }
2717 }
2718 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2719 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2726 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2730 return JNI_EINVAL;
2731 }
2732 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2733 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2734 return JNI_EINVAL;
2735 }
2736 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2740 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2741 return JNI_EINVAL;
2742 }
2743 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746 } else if (match_option(option, "--finalization=", &tail)) {
2747 if (strcmp(tail, "enabled") == 0) {
2748 InstanceKlass::set_finalization_enabled(true);
2749 } else if (strcmp(tail, "disabled") == 0) {
2750 InstanceKlass::set_finalization_enabled(false);
2751 } else {
2752 jio_fprintf(defaultStream::error_stream(),
2753 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2754 tail);
2755 return JNI_EINVAL;
2756 }
2757 #if !defined(DTRACE_ENABLED)
2758 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "DTraceMethodProbes flag is not applicable for this configuration\n");
2761 return JNI_EINVAL;
2762 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2763 jio_fprintf(defaultStream::error_stream(),
2764 "DTraceAllocProbes flag is not applicable for this configuration\n");
2765 return JNI_EINVAL;
2766 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2767 jio_fprintf(defaultStream::error_stream(),
2768 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2769 return JNI_EINVAL;
2770 #endif // !defined(DTRACE_ENABLED)
2771 #ifdef ASSERT
2772 } else if (match_option(option, "-XX:+FullGCALot")) {
2773 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2774 return JNI_EINVAL;
2775 }
2776 #endif
2777 #if !INCLUDE_MANAGEMENT
2778 } else if (match_option(option, "-XX:+ManagementServer")) {
2779 jio_fprintf(defaultStream::error_stream(),
2780 "ManagementServer is not supported in this VM.\n");
2781 return JNI_ERR;
2782 #endif // INCLUDE_MANAGEMENT
2783 #if INCLUDE_JVMCI
2784 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2785 if (EnableJVMCIProduct) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2788 return JNI_EINVAL;
2789 }
2790 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2791 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2792 if (use_graal_jit) {
2793 const char* jvmci_compiler = get_property("jvmci.Compiler");
2794 if (jvmci_compiler != nullptr) {
2795 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2798 return JNI_ERR;
2799 }
2800 } else if (!add_property("jvmci.Compiler=graal")) {
2801 return JNI_ENOMEM;
2802 }
2803 }
2804
2805 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2806 if (EnableJVMCIProduct) {
2807 continue;
2808 }
2809 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2810 // Allow this flag if it has been unlocked.
2811 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2812 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Unable to enable JVMCI in product mode\n");
2815 return JNI_ERR;
2816 }
2817 }
2818 // The flag was locked so process normally to report that error
2819 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2820 return JNI_EINVAL;
2821 }
2822 #endif // INCLUDE_JVMCI
2823 #if INCLUDE_JFR
2824 } else if (match_jfr_option(&option)) {
2825 return JNI_EINVAL;
2826 #endif
2827 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2828 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2829 // already been handled
2830 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2831 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2832 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2833 return JNI_EINVAL;
2834 }
2835 }
2836 // Unknown option
2837 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2838 return JNI_ERR;
2839 }
2840 }
2841
2842 // PrintSharedArchiveAndExit will turn on
2843 // -Xshare:on
2844 // -Xlog:class+path=info
2845 if (PrintSharedArchiveAndExit) {
2846 UseSharedSpaces = true;
2847 RequireSharedSpaces = true;
2848 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2849 }
2850
2851 fix_appclasspath();
2852
2853 return JNI_OK;
2854 }
2855
2856 void Arguments::set_ext_dirs(char *value) {
2857 _ext_dirs = os::strdup_check_oom(value);
2858 }
2859
2860 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2861 // For java.base check for duplicate --patch-module options being specified on the command line.
2862 // This check is only required for java.base, all other duplicate module specifications
2863 // will be checked during module system initialization. The module system initialization
2864 // will throw an ExceptionInInitializerError if this situation occurs.
2865 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2866 if (patch_mod_javabase) {
2867 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2868 } else {
2869 patch_mod_javabase = true;
2870 }
2871 }
2872
2873 // Create GrowableArray lazily, only if --patch-module has been specified
2874 if (_patch_mod_prefix == nullptr) {
2875 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2876 }
2877
2878 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2879 }
2880
2881 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2882 //
2883 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2884 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2885 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2886 // path is treated as the current directory.
2887 //
2888 // This causes problems with CDS, which requires that all directories specified in the classpath
2889 // must be empty. In most cases, applications do NOT want to load classes from the current
2890 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2891 // scripts compatible with CDS.
2892 void Arguments::fix_appclasspath() {
2893 if (IgnoreEmptyClassPaths) {
2894 const char separator = *os::path_separator();
2895 const char* src = _java_class_path->value();
2896
2897 // skip over all the leading empty paths
2898 while (*src == separator) {
2899 src ++;
2900 }
2901
2902 char* copy = os::strdup_check_oom(src, mtArguments);
2903
2904 // trim all trailing empty paths
2905 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2906 *tail = '\0';
2907 }
2908
2909 char from[3] = {separator, separator, '\0'};
2910 char to [2] = {separator, '\0'};
2911 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2912 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2913 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2914 }
2915
2916 _java_class_path->set_writeable_value(copy);
2917 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2918 }
2919 }
2920
2921 jint Arguments::finalize_vm_init_args() {
2922 // check if the default lib/endorsed directory exists; if so, error
2923 char path[JVM_MAXPATHLEN];
2924 const char* fileSep = os::file_separator();
2925 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2926
2927 DIR* dir = os::opendir(path);
2928 if (dir != nullptr) {
2929 jio_fprintf(defaultStream::output_stream(),
2930 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2931 "in modular form will be supported via the concept of upgradeable modules.\n");
2932 os::closedir(dir);
2933 return JNI_ERR;
2934 }
2935
2936 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2937 dir = os::opendir(path);
2938 if (dir != nullptr) {
2939 jio_fprintf(defaultStream::output_stream(),
2940 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2941 "Use -classpath instead.\n.");
2942 os::closedir(dir);
2943 return JNI_ERR;
2944 }
2945
2946 // This must be done after all arguments have been processed
2947 // and the container support has been initialized since AggressiveHeap
2948 // relies on the amount of total memory available.
2949 if (AggressiveHeap) {
2950 jint result = set_aggressive_heap_flags();
2951 if (result != JNI_OK) {
2952 return result;
2953 }
2954 }
2955
2956 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2957 // but like -Xint, leave compilation thresholds unaffected.
2958 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2959 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2960 set_mode_flags(_int);
2961 }
2962
2963 #ifdef ZERO
2964 // Zero always runs in interpreted mode
2965 set_mode_flags(_int);
2966 #endif
2967
2968 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2969 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2970 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2971 }
2972
2973 #if !COMPILER2_OR_JVMCI
2974 // Don't degrade server performance for footprint
2975 if (FLAG_IS_DEFAULT(UseLargePages) &&
2976 MaxHeapSize < LargePageHeapSizeThreshold) {
2977 // No need for large granularity pages w/small heaps.
2978 // Note that large pages are enabled/disabled for both the
2979 // Java heap and the code cache.
2980 FLAG_SET_DEFAULT(UseLargePages, false);
2981 }
2982
2983 UNSUPPORTED_OPTION(ProfileInterpreter);
2984 #endif
2985
2986 // Parse the CompilationMode flag
2987 if (!CompilationModeFlag::initialize()) {
2988 return JNI_ERR;
2989 }
2990
2991 ClassLoader::set_preview_mode(is_valhalla_enabled());
2992
2993 if (!check_vm_args_consistency()) {
2994 return JNI_ERR;
2995 }
2996
2997 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2998 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2999 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3000
3001 return JNI_OK;
3002 }
3003
3004 // Helper class for controlling the lifetime of JavaVMInitArgs
3005 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3006 // deleted on the destruction of the ScopedVMInitArgs object.
3007 class ScopedVMInitArgs : public StackObj {
3008 private:
3009 JavaVMInitArgs _args;
3010 char* _container_name;
3011 bool _is_set;
3012 char* _vm_options_file_arg;
3013
3014 public:
3015 ScopedVMInitArgs(const char *container_name) {
3016 _args.version = JNI_VERSION_1_2;
3017 _args.nOptions = 0;
3018 _args.options = nullptr;
3019 _args.ignoreUnrecognized = false;
3020 _container_name = (char *)container_name;
3021 _is_set = false;
3022 _vm_options_file_arg = nullptr;
3023 }
3024
3025 // Populates the JavaVMInitArgs object represented by this
3026 // ScopedVMInitArgs object with the arguments in options. The
3027 // allocated memory is deleted by the destructor. If this method
3028 // returns anything other than JNI_OK, then this object is in a
3029 // partially constructed state, and should be abandoned.
3030 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3031 _is_set = true;
3032 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3033 JavaVMOption, options->length(), mtArguments);
3034 if (options_arr == nullptr) {
3035 return JNI_ENOMEM;
3036 }
3037 _args.options = options_arr;
3038
3039 for (int i = 0; i < options->length(); i++) {
3040 options_arr[i] = options->at(i);
3041 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3042 if (options_arr[i].optionString == nullptr) {
3043 // Rely on the destructor to do cleanup.
3044 _args.nOptions = i;
3045 return JNI_ENOMEM;
3046 }
3047 }
3048
3049 _args.nOptions = options->length();
3050 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3051 return JNI_OK;
3052 }
3053
3054 JavaVMInitArgs* get() { return &_args; }
3055 char* container_name() { return _container_name; }
3056 bool is_set() { return _is_set; }
3057 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3058 char* vm_options_file_arg() { return _vm_options_file_arg; }
3059
3060 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3061 if (_vm_options_file_arg != nullptr) {
3062 os::free(_vm_options_file_arg);
3063 }
3064 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3065 }
3066
3067 ~ScopedVMInitArgs() {
3068 if (_vm_options_file_arg != nullptr) {
3069 os::free(_vm_options_file_arg);
3070 }
3071 if (_args.options == nullptr) return;
3072 for (int i = 0; i < _args.nOptions; i++) {
3073 os::free(_args.options[i].optionString);
3074 }
3075 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3076 }
3077
3078 // Insert options into this option list, to replace option at
3079 // vm_options_file_pos (-XX:VMOptionsFile)
3080 jint insert(const JavaVMInitArgs* args,
3081 const JavaVMInitArgs* args_to_insert,
3082 const int vm_options_file_pos) {
3083 assert(_args.options == nullptr, "shouldn't be set yet");
3084 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3085 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3086
3087 int length = args->nOptions + args_to_insert->nOptions - 1;
3088 // Construct new option array
3089 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3090 for (int i = 0; i < args->nOptions; i++) {
3091 if (i == vm_options_file_pos) {
3092 // insert the new options starting at the same place as the
3093 // -XX:VMOptionsFile option
3094 for (int j = 0; j < args_to_insert->nOptions; j++) {
3095 options.push(args_to_insert->options[j]);
3096 }
3097 } else {
3098 options.push(args->options[i]);
3099 }
3100 }
3101 // make into options array
3102 return set_args(&options);
3103 }
3104 };
3105
3106 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3107 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3108 }
3109
3110 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3111 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3112 }
3113
3114 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3115 for (int index = args->nOptions - 1; index >= 0; index--) {
3116 JavaVMOption* option = args->options + index;
3117 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3118 return option;
3119 }
3120 }
3121
3122 return nullptr;
3123 }
3124
3125 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3126 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3127 // Don't bother scanning all the args if this env variable is not set
3128 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3129 return JNI_OK;
3130 }
3131
3132 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3133 // of AOTMode.
3134 JavaVMOption* option = nullptr;
3135 for (int i = all_args->length() - 1; i >= 0; i--) {
3136 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3137 break;
3138 }
3139 }
3140
3141 if (option != nullptr) {
3142 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3143 // so its value is not reflected inside the global variable AOTMode.
3144 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3145 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3146 }
3147 } else {
3148 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3149 // which would have been set inside process_settings_file();
3150 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3151 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3152 }
3153 }
3154
3155 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3156 }
3157
3158 jint Arguments::parse_options_environment_variable(const char* name,
3159 ScopedVMInitArgs* vm_args) {
3160 char *buffer = ::getenv(name);
3161
3162 // Don't check this environment variable if user has special privileges
3163 // (e.g. unix su command).
3164 if (buffer == nullptr || os::have_special_privileges()) {
3165 return JNI_OK;
3166 }
3167
3168 if ((buffer = os::strdup(buffer)) == nullptr) {
3169 return JNI_ENOMEM;
3170 }
3171
3172 jio_fprintf(defaultStream::error_stream(),
3173 "Picked up %s: %s\n", name, buffer);
3174
3175 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3176
3177 os::free(buffer);
3178 return retcode;
3179 }
3180
3181 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3182 // read file into buffer
3183 int fd = ::open(file_name, O_RDONLY);
3184 if (fd < 0) {
3185 jio_fprintf(defaultStream::error_stream(),
3186 "Could not open options file '%s'\n",
3187 file_name);
3188 return JNI_ERR;
3189 }
3190
3191 struct stat stbuf;
3192 int retcode = os::stat(file_name, &stbuf);
3193 if (retcode != 0) {
3194 jio_fprintf(defaultStream::error_stream(),
3195 "Could not stat options file '%s'\n",
3196 file_name);
3197 ::close(fd);
3198 return JNI_ERR;
3199 }
3200
3201 if (stbuf.st_size == 0) {
3202 // tell caller there is no option data and that is ok
3203 ::close(fd);
3204 return JNI_OK;
3205 }
3206
3207 // '+ 1' for null termination even with max bytes
3208 size_t bytes_alloc = stbuf.st_size + 1;
3209
3210 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3211 if (nullptr == buf) {
3212 jio_fprintf(defaultStream::error_stream(),
3213 "Could not allocate read buffer for options file parse\n");
3214 ::close(fd);
3215 return JNI_ENOMEM;
3216 }
3217
3218 memset(buf, 0, bytes_alloc);
3219
3220 // Fill buffer
3221 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3222 ::close(fd);
3223 if (bytes_read < 0) {
3224 FREE_C_HEAP_ARRAY(char, buf);
3225 jio_fprintf(defaultStream::error_stream(),
3226 "Could not read options file '%s'\n", file_name);
3227 return JNI_ERR;
3228 }
3229
3230 if (bytes_read == 0) {
3231 // tell caller there is no option data and that is ok
3232 FREE_C_HEAP_ARRAY(char, buf);
3233 return JNI_OK;
3234 }
3235
3236 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3237
3238 FREE_C_HEAP_ARRAY(char, buf);
3239 return retcode;
3240 }
3241
3242 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3243 // Construct option array
3244 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3245
3246 // some pointers to help with parsing
3247 char *buffer_end = buffer + buf_len;
3248 char *opt_hd = buffer;
3249 char *wrt = buffer;
3250 char *rd = buffer;
3251
3252 // parse all options
3253 while (rd < buffer_end) {
3254 // skip leading white space from the input string
3255 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3256 rd++;
3257 }
3258
3259 if (rd >= buffer_end) {
3260 break;
3261 }
3262
3263 // Remember this is where we found the head of the token.
3264 opt_hd = wrt;
3265
3266 // Tokens are strings of non white space characters separated
3267 // by one or more white spaces.
3268 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3269 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3270 int quote = *rd; // matching quote to look for
3271 rd++; // don't copy open quote
3272 while (rd < buffer_end && *rd != quote) {
3273 // include everything (even spaces)
3274 // up until the close quote
3275 *wrt++ = *rd++; // copy to option string
3276 }
3277
3278 if (rd < buffer_end) {
3279 rd++; // don't copy close quote
3280 } else {
3281 // did not see closing quote
3282 jio_fprintf(defaultStream::error_stream(),
3283 "Unmatched quote in %s\n", name);
3284 return JNI_ERR;
3285 }
3286 } else {
3287 *wrt++ = *rd++; // copy to option string
3288 }
3289 }
3290
3291 // steal a white space character and set it to null
3292 *wrt++ = '\0';
3293 // We now have a complete token
3294
3295 JavaVMOption option;
3296 option.optionString = opt_hd;
3297 option.extraInfo = nullptr;
3298
3299 options.append(option); // Fill in option
3300
3301 rd++; // Advance to next character
3302 }
3303
3304 // Fill out JavaVMInitArgs structure.
3305 return vm_args->set_args(&options);
3306 }
3307
3308 #ifndef PRODUCT
3309 // Determine whether LogVMOutput should be implicitly turned on.
3310 static bool use_vm_log() {
3311 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3312 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3313 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3314 PrintAssembly || TraceDeoptimization ||
3315 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3316 return true;
3317 }
3318
3319 #ifdef COMPILER1
3320 if (PrintC1Statistics) {
3321 return true;
3322 }
3323 #endif // COMPILER1
3324
3325 #ifdef COMPILER2
3326 if (PrintOptoAssembly || PrintOptoStatistics) {
3327 return true;
3328 }
3329 #endif // COMPILER2
3330
3331 return false;
3332 }
3333
3334 #endif // PRODUCT
3335
3336 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3337 for (int index = 0; index < args->nOptions; index++) {
3338 const JavaVMOption* option = args->options + index;
3339 const char* tail;
3340 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3341 return true;
3342 }
3343 }
3344 return false;
3345 }
3346
3347 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3348 const char* vm_options_file,
3349 const int vm_options_file_pos,
3350 ScopedVMInitArgs* vm_options_file_args,
3351 ScopedVMInitArgs* args_out) {
3352 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3353 if (code != JNI_OK) {
3354 return code;
3355 }
3356
3357 if (vm_options_file_args->get()->nOptions < 1) {
3358 return JNI_OK;
3359 }
3360
3361 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3362 jio_fprintf(defaultStream::error_stream(),
3363 "A VM options file may not refer to a VM options file. "
3364 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3365 "options file '%s' in options container '%s' is an error.\n",
3366 vm_options_file_args->vm_options_file_arg(),
3367 vm_options_file_args->container_name());
3368 return JNI_EINVAL;
3369 }
3370
3371 return args_out->insert(args, vm_options_file_args->get(),
3372 vm_options_file_pos);
3373 }
3374
3375 // Expand -XX:VMOptionsFile found in args_in as needed.
3376 // mod_args and args_out parameters may return values as needed.
3377 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3378 ScopedVMInitArgs* mod_args,
3379 JavaVMInitArgs** args_out) {
3380 jint code = match_special_option_and_act(args_in, mod_args);
3381 if (code != JNI_OK) {
3382 return code;
3383 }
3384
3385 if (mod_args->is_set()) {
3386 // args_in contains -XX:VMOptionsFile and mod_args contains the
3387 // original options from args_in along with the options expanded
3388 // from the VMOptionsFile. Return a short-hand to the caller.
3389 *args_out = mod_args->get();
3390 } else {
3391 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3392 }
3393 return JNI_OK;
3394 }
3395
3396 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3397 ScopedVMInitArgs* args_out) {
3398 // Remaining part of option string
3399 const char* tail;
3400 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3401
3402 for (int index = 0; index < args->nOptions; index++) {
3403 const JavaVMOption* option = args->options + index;
3404 if (match_option(option, "-XX:Flags=", &tail)) {
3405 Arguments::set_jvm_flags_file(tail);
3406 continue;
3407 }
3408 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3409 if (vm_options_file_args.found_vm_options_file_arg()) {
3410 jio_fprintf(defaultStream::error_stream(),
3411 "The option '%s' is already specified in the options "
3412 "container '%s' so the specification of '%s' in the "
3413 "same options container is an error.\n",
3414 vm_options_file_args.vm_options_file_arg(),
3415 vm_options_file_args.container_name(),
3416 option->optionString);
3417 return JNI_EINVAL;
3418 }
3419 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3420 // If there's a VMOptionsFile, parse that
3421 jint code = insert_vm_options_file(args, tail, index,
3422 &vm_options_file_args, args_out);
3423 if (code != JNI_OK) {
3424 return code;
3425 }
3426 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3427 if (args_out->is_set()) {
3428 // The VMOptions file inserted some options so switch 'args'
3429 // to the new set of options, and continue processing which
3430 // preserves "last option wins" semantics.
3431 args = args_out->get();
3432 // The first option from the VMOptionsFile replaces the
3433 // current option. So we back track to process the
3434 // replacement option.
3435 index--;
3436 }
3437 continue;
3438 }
3439 if (match_option(option, "-XX:+PrintVMOptions")) {
3440 PrintVMOptions = true;
3441 continue;
3442 }
3443 if (match_option(option, "-XX:-PrintVMOptions")) {
3444 PrintVMOptions = false;
3445 continue;
3446 }
3447 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3448 IgnoreUnrecognizedVMOptions = true;
3449 continue;
3450 }
3451 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3452 IgnoreUnrecognizedVMOptions = false;
3453 continue;
3454 }
3455 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3456 JVMFlag::printFlags(tty, false);
3457 vm_exit(0);
3458 }
3459
3460 #ifndef PRODUCT
3461 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3462 JVMFlag::printFlags(tty, true);
3463 vm_exit(0);
3464 }
3465 #endif
3466 }
3467 return JNI_OK;
3468 }
3469
3470 static void print_options(const JavaVMInitArgs *args) {
3471 const char* tail;
3472 for (int index = 0; index < args->nOptions; index++) {
3473 const JavaVMOption *option = args->options + index;
3474 if (match_option(option, "-XX:", &tail)) {
3475 logOption(tail);
3476 }
3477 }
3478 }
3479
3480 bool Arguments::handle_deprecated_print_gc_flags() {
3481 if (PrintGC) {
3482 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3483 }
3484 if (PrintGCDetails) {
3485 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3486 }
3487
3488 if (_legacyGCLogging.lastFlag == 2) {
3489 // -Xloggc was used to specify a filename
3490 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3491
3492 LogTarget(Error, logging) target;
3493 LogStream errstream(target);
3494 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3495 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3496 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3497 }
3498 return true;
3499 }
3500
3501 static void apply_debugger_ergo() {
3502 #ifdef ASSERT
3503 if (ReplayCompiles) {
3504 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3505 }
3506
3507 if (UseDebuggerErgo) {
3508 // Turn on sub-flags
3509 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3510 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3511 }
3512
3513 if (UseDebuggerErgo2) {
3514 // Debugging with limited number of CPUs
3515 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3516 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3517 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3518 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3519 }
3520 #endif // ASSERT
3521 }
3522
3523 // Parse entry point called from JNI_CreateJavaVM
3524
3525 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3526 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3527 JVMFlag::check_all_flag_declarations();
3528
3529 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3530 const char* hotspotrc = ".hotspotrc";
3531 bool settings_file_specified = false;
3532 bool needs_hotspotrc_warning = false;
3533 ScopedVMInitArgs initial_vm_options_args("");
3534 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3535 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3536 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3537
3538 // Pointers to current working set of containers
3539 JavaVMInitArgs* cur_cmd_args;
3540 JavaVMInitArgs* cur_vm_options_args;
3541 JavaVMInitArgs* cur_java_options_args;
3542 JavaVMInitArgs* cur_java_tool_options_args;
3543 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3544
3545 // Containers for modified/expanded options
3546 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3547 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3548 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3549 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3550 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3551
3552 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3553
3554 jint code =
3555 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3556 if (code != JNI_OK) {
3557 return code;
3558 }
3559
3560 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3561 // This is an undocumented feature.
3562 code = parse_java_options_environment_variable(&initial_java_options_args);
3563 if (code != JNI_OK) {
3564 return code;
3565 }
3566
3567 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3568 char *vmoptions = ClassLoader::lookup_vm_options();
3569 if (vmoptions != nullptr) {
3570 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3571 FREE_C_HEAP_ARRAY(char, vmoptions);
3572 if (code != JNI_OK) {
3573 return code;
3574 }
3575 }
3576
3577 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3578 &mod_java_tool_options_args,
3579 &cur_java_tool_options_args);
3580 if (code != JNI_OK) {
3581 return code;
3582 }
3583
3584 code = expand_vm_options_as_needed(initial_cmd_args,
3585 &mod_cmd_args,
3586 &cur_cmd_args);
3587 if (code != JNI_OK) {
3588 return code;
3589 }
3590
3591 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3592 &mod_java_options_args,
3593 &cur_java_options_args);
3594 if (code != JNI_OK) {
3595 return code;
3596 }
3597
3598 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3599 &mod_vm_options_args,
3600 &cur_vm_options_args);
3601 if (code != JNI_OK) {
3602 return code;
3603 }
3604
3605 const char* flags_file = Arguments::get_jvm_flags_file();
3606 settings_file_specified = (flags_file != nullptr);
3607
3608 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3609 if (settings_file_specified) {
3610 if (!process_settings_file(flags_file, true,
3611 IgnoreUnrecognizedVMOptions)) {
3612 return JNI_EINVAL;
3613 }
3614 } else {
3615 #ifdef ASSERT
3616 // Parse default .hotspotrc settings file
3617 if (!process_settings_file(".hotspotrc", false,
3618 IgnoreUnrecognizedVMOptions)) {
3619 return JNI_EINVAL;
3620 }
3621 #else
3622 struct stat buf;
3623 if (os::stat(hotspotrc, &buf) == 0) {
3624 needs_hotspotrc_warning = true;
3625 }
3626 #endif
3627 }
3628
3629 // The settings in the args are applied in this order to the the JVM global flags.
3630 // For historical reasons, the order is DIFFERENT than the scanning order of
3631 // the above expand_vm_options_as_needed() calls.
3632 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3633 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3634 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3635 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3636
3637 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3638 // the options that have been gathered above.
3639 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3640 if (code != JNI_OK) {
3641 return code;
3642 }
3643 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3644 &mod_jdk_aot_vm_options_args,
3645 &cur_jdk_aot_vm_options_args);
3646 if (code != JNI_OK) {
3647 return code;
3648 }
3649
3650 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3651 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3652 const char* optionString = option->optionString;
3653 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3654 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3655 jio_fprintf(defaultStream::error_stream(),
3656 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3657 return JNI_ERR;
3658 }
3659 }
3660
3661 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3662
3663 if (IgnoreUnrecognizedVMOptions) {
3664 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3665 // the JDK so it shouldn't have bad options.
3666 cur_cmd_args->ignoreUnrecognized = true;
3667 cur_java_tool_options_args->ignoreUnrecognized = true;
3668 cur_java_options_args->ignoreUnrecognized = true;
3669 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3670 }
3671
3672 if (PrintVMOptions) {
3673 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3674 print_options(cur_java_tool_options_args);
3675 print_options(cur_cmd_args);
3676 print_options(cur_java_options_args);
3677 print_options(cur_jdk_aot_vm_options_args);
3678 }
3679
3680 // Apply the settings in these args to the JVM global flags.
3681 jint result = parse_vm_init_args(&all_args);
3682
3683 if (result != JNI_OK) {
3684 return result;
3685 }
3686
3687 // Delay warning until here so that we've had a chance to process
3688 // the -XX:-PrintWarnings flag
3689 if (needs_hotspotrc_warning) {
3690 warning("%s file is present but has been ignored. "
3691 "Run with -XX:Flags=%s to load the file.",
3692 hotspotrc, hotspotrc);
3693 }
3694
3695 if (needs_module_property_warning) {
3696 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3697 " names that are reserved for internal use.");
3698 }
3699
3700 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3701 UNSUPPORTED_OPTION(UseLargePages);
3702 #endif
3703
3704 #if defined(AIX)
3705 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3706 #endif
3707
3708 #ifndef PRODUCT
3709 if (TraceBytecodesAt != 0) {
3710 TraceBytecodes = true;
3711 }
3712 #endif // PRODUCT
3713
3714 if (ScavengeRootsInCode == 0) {
3715 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3716 warning("Forcing ScavengeRootsInCode non-zero");
3717 }
3718 ScavengeRootsInCode = 1;
3719 }
3720
3721 if (!handle_deprecated_print_gc_flags()) {
3722 return JNI_EINVAL;
3723 }
3724
3725 // Set object alignment values.
3726 set_object_alignment();
3727
3728 #if !INCLUDE_CDS
3729 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3730 jio_fprintf(defaultStream::error_stream(),
3731 "Shared spaces are not supported in this VM\n");
3732 return JNI_ERR;
3733 }
3734 if (DumpLoadedClassList != nullptr) {
3735 jio_fprintf(defaultStream::error_stream(),
3736 "DumpLoadedClassList is not supported in this VM\n");
3737 return JNI_ERR;
3738 }
3739 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3740 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3741 warning("Shared spaces are not supported in this VM");
3742 UseSharedSpaces = false;
3743 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3744 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3745 }
3746 no_shared_spaces("CDS Disabled");
3747 #endif // INCLUDE_CDS
3748
3749 // Verify NMT arguments
3750 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3751 if (lvl == NMT_unknown) {
3752 jio_fprintf(defaultStream::error_stream(),
3753 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3754 return JNI_ERR;
3755 }
3756 if (PrintNMTStatistics && lvl == NMT_off) {
3757 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3758 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3759 }
3760
3761 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3762 if (trace_dependencies && VerifyDependencies) {
3763 warning("dependency logging results may be inflated by VerifyDependencies");
3764 }
3765
3766 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3767 log_is_enabled(Info, class, load, cause);
3768 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3769 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3770 }
3771
3772 apply_debugger_ergo();
3773
3774 // The VMThread needs to stop now and then to execute these debug options.
3775 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3776 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3777 }
3778
3779 if (log_is_enabled(Info, arguments)) {
3780 LogStream st(Log(arguments)::info());
3781 Arguments::print_on(&st);
3782 }
3783
3784 return JNI_OK;
3785 }
3786
3787 void Arguments::set_compact_headers_flags() {
3788 #ifdef _LP64
3789 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3790 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3791 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3792 }
3793 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3794 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3795 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3796 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3797
3798 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3799 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3800 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3801 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3802 } else {
3803 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3804 }
3805 }
3806 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3807 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3808 }
3809 #endif
3810 }
3811
3812 jint Arguments::apply_ergo() {
3813 // Set flags based on ergonomics.
3814 jint result = set_ergonomics_flags();
3815 if (result != JNI_OK) return result;
3816
3817 // Set heap size based on available physical memory
3818 set_heap_size();
3819
3820 GCConfig::arguments()->initialize();
3821
3822 set_compact_headers_flags();
3823
3824 if (UseCompressedClassPointers) {
3825 CompressedKlassPointers::pre_initialize();
3826 }
3827
3828 CDSConfig::ergo_initialize();
3829
3830 // Initialize Metaspace flags and alignments
3831 Metaspace::ergo_initialize();
3832
3833 if (!StringDedup::ergo_initialize()) {
3834 return JNI_EINVAL;
3835 }
3836
3837 // Set compiler flags after GC is selected and GC specific
3838 // flags (LoopStripMiningIter) are set.
3839 CompilerConfig::ergo_initialize();
3840
3841 // Set bytecode rewriting flags
3842 set_bytecode_flags();
3843
3844 // Set flags if aggressive optimization flags are enabled
3845 jint code = set_aggressive_opts_flags();
3846 if (code != JNI_OK) {
3847 return code;
3848 }
3849
3850 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3851 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3852 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3853 warning("UseSecondarySupersTable is not supported");
3854 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3855 }
3856 if (!UseSecondarySupersTable) {
3857 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3858 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3859 }
3860
3861 #ifdef ZERO
3862 // Clear flags not supported on zero.
3863 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3864 #endif // ZERO
3865
3866 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3867 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3868 DebugNonSafepoints = true;
3869 }
3870
3871 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3872 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3873 }
3874
3875 // Treat the odd case where local verification is enabled but remote
3876 // verification is not as if both were enabled.
3877 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3878 log_info(verification)("Turning on remote verification because local verification is on");
3879 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3880 }
3881 if (!is_valhalla_enabled()) {
3882 #define WARN_IF_NOT_DEFAULT_FLAG(flag) \
3883 if (!FLAG_IS_DEFAULT(flag)) { \
3884 warning("Valhalla-specific flag \"%s\" has no effect when --enable-preview is not specified.", #flag); \
3885 }
3886
3887 #define DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(flag) \
3888 WARN_IF_NOT_DEFAULT_FLAG(flag) \
3889 FLAG_SET_DEFAULT(flag, false);
3890
3891 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypePassFieldsAsArgs);
3892 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypeReturnedAsFields);
3893 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayFlattening);
3894 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseFieldFlattening);
3895 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNonAtomicValueFlattening);
3896 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullableValueFlattening);
3897 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseAtomicValueFlattening);
3898 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintInlineLayout);
3899 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintFlatArrayLayout);
3900 WARN_IF_NOT_DEFAULT_FLAG(FlatArrayElementMaxOops);
3901 #ifdef ASSERT
3902 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(StressCallingConvention);
3903 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PreloadClasses);
3904 WARN_IF_NOT_DEFAULT_FLAG(PrintInlineKlassFields);
3905 #endif
3906 #ifdef COMPILER1
3907 DEBUG_ONLY(DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(C1UseDelayedFlattenedFieldReads);)
3908 #endif
3909 #ifdef COMPILER2
3910 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayLoadStoreProfile);
3911 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseACmpProfile);
3912 #endif
3913 #undef DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT
3914 #undef WARN_IF_NOT_DEFAULT_FLAG
3915 } else {
3916 if (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces) {
3917 // Disable calling convention optimizations if inline types are not supported.
3918 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3919 // the CDS archive, as the values must match between dumptime and runtime.
3920 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3921 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3922 }
3923 if (!UseNonAtomicValueFlattening && !UseNullableValueFlattening && !UseAtomicValueFlattening) {
3924 // Flattening is disabled
3925 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3926 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3927 }
3928 }
3929
3930 #ifndef PRODUCT
3931 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3932 if (use_vm_log()) {
3933 LogVMOutput = true;
3934 }
3935 }
3936 #endif // PRODUCT
3937
3938 if (PrintCommandLineFlags) {
3939 JVMFlag::printSetFlags(tty);
3940 }
3941
3942 #if COMPILER2_OR_JVMCI
3943 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3944 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3945 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3946 }
3947 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3948
3949 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3950 if (!EnableVectorReboxing) {
3951 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3952 } else {
3953 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3954 }
3955 }
3956 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3957 }
3958 #endif // COMPILER2_OR_JVMCI
3959
3960 #ifdef COMPILER2
3961 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3962 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3963 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3964 }
3965 #endif // COMPILER2
3966
3967 if (log_is_enabled(Info, perf, class, link)) {
3968 if (!UsePerfData) {
3969 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3970 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3971 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3972 }
3973 }
3974
3975 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3976 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3977 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3978 }
3979 }
3980 return JNI_OK;
3981 }
3982
3983 jint Arguments::adjust_after_os() {
3984 if (UseNUMA) {
3985 if (UseParallelGC) {
3986 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3987 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3988 }
3989 }
3990 }
3991 return JNI_OK;
3992 }
3993
3994 int Arguments::PropertyList_count(SystemProperty* pl) {
3995 int count = 0;
3996 while(pl != nullptr) {
3997 count++;
3998 pl = pl->next();
3999 }
4000 return count;
4001 }
4002
4003 // Return the number of readable properties.
4004 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4005 int count = 0;
4006 while(pl != nullptr) {
4007 if (pl->readable()) {
4008 count++;
4009 }
4010 pl = pl->next();
4011 }
4012 return count;
4013 }
4014
4015 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4016 assert(key != nullptr, "just checking");
4017 SystemProperty* prop;
4018 for (prop = pl; prop != nullptr; prop = prop->next()) {
4019 if (strcmp(key, prop->key()) == 0) return prop->value();
4020 }
4021 return nullptr;
4022 }
4023
4024 // Return the value of the requested property provided that it is a readable property.
4025 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4026 assert(key != nullptr, "just checking");
4027 SystemProperty* prop;
4028 // Return the property value if the keys match and the property is not internal or
4029 // it's the special internal property "jdk.boot.class.path.append".
4030 for (prop = pl; prop != nullptr; prop = prop->next()) {
4031 if (strcmp(key, prop->key()) == 0) {
4032 if (!prop->internal()) {
4033 return prop->value();
4034 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4035 return prop->value();
4036 } else {
4037 // Property is internal and not jdk.boot.class.path.append so return null.
4038 return nullptr;
4039 }
4040 }
4041 }
4042 return nullptr;
4043 }
4044
4045 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4046 SystemProperty* p = *plist;
4047 if (p == nullptr) {
4048 *plist = new_p;
4049 } else {
4050 while (p->next() != nullptr) {
4051 p = p->next();
4052 }
4053 p->set_next(new_p);
4054 }
4055 }
4056
4057 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4058 bool writeable, bool internal) {
4059 if (plist == nullptr)
4060 return;
4061
4062 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4063 PropertyList_add(plist, new_p);
4064 }
4065
4066 void Arguments::PropertyList_add(SystemProperty *element) {
4067 PropertyList_add(&_system_properties, element);
4068 }
4069
4070 // This add maintains unique property key in the list.
4071 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4072 PropertyAppendable append, PropertyWriteable writeable,
4073 PropertyInternal internal) {
4074 if (plist == nullptr)
4075 return;
4076
4077 // If property key exists and is writeable, then update with new value.
4078 // Trying to update a non-writeable property is silently ignored.
4079 SystemProperty* prop;
4080 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4081 if (strcmp(k, prop->key()) == 0) {
4082 if (append == AppendProperty) {
4083 prop->append_writeable_value(v);
4084 } else {
4085 prop->set_writeable_value(v);
4086 }
4087 return;
4088 }
4089 }
4090
4091 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4092 }
4093
4094 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4095 // Returns true if all of the source pointed by src has been copied over to
4096 // the destination buffer pointed by buf. Otherwise, returns false.
4097 // Notes:
4098 // 1. If the length (buflen) of the destination buffer excluding the
4099 // null terminator character is not long enough for holding the expanded
4100 // pid characters, it also returns false instead of returning the partially
4101 // expanded one.
4102 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4103 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4104 char* buf, size_t buflen) {
4105 const char* p = src;
4106 char* b = buf;
4107 const char* src_end = &src[srclen];
4108 char* buf_end = &buf[buflen - 1];
4109
4110 while (p < src_end && b < buf_end) {
4111 if (*p == '%') {
4112 switch (*(++p)) {
4113 case '%': // "%%" ==> "%"
4114 *b++ = *p++;
4115 break;
4116 case 'p': { // "%p" ==> current process id
4117 // buf_end points to the character before the last character so
4118 // that we could write '\0' to the end of the buffer.
4119 size_t buf_sz = buf_end - b + 1;
4120 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4121
4122 // if jio_snprintf fails or the buffer is not long enough to hold
4123 // the expanded pid, returns false.
4124 if (ret < 0 || ret >= (int)buf_sz) {
4125 return false;
4126 } else {
4127 b += ret;
4128 assert(*b == '\0', "fail in copy_expand_pid");
4129 if (p == src_end && b == buf_end + 1) {
4130 // reach the end of the buffer.
4131 return true;
4132 }
4133 }
4134 p++;
4135 break;
4136 }
4137 default :
4138 *b++ = '%';
4139 }
4140 } else {
4141 *b++ = *p++;
4142 }
4143 }
4144 *b = '\0';
4145 return (p == src_end); // return false if not all of the source was copied
4146 }