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/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/objLayout.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiAgentList.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/flags/jvmFlag.hpp"
55 #include "runtime/flags/jvmFlagAccess.hpp"
56 #include "runtime/flags/jvmFlagLimit.hpp"
57 #include "runtime/globals.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 char* Arguments::_java_command = nullptr;
91 SystemProperty* Arguments::_system_properties = nullptr;
92 size_t Arguments::_conservative_max_heap_alignment = 0;
93 Arguments::Mode Arguments::_mode = _mixed;
94 const char* Arguments::_java_vendor_url_bug = nullptr;
95 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
96 bool Arguments::_executing_unit_tests = false;
97
98 // These parameters are reset in method parse_vm_init_args()
99 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
100 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
101 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
102 bool Arguments::_ClipInlining = ClipInlining;
103 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
104
105 bool Arguments::_enable_preview = false;
106 bool Arguments::_has_jdwp_agent = false;
107
108 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
109
110 // These are not set by the JDK's built-in launchers, but they can be set by
111 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
112 // JavaVMOption in jni.h.
113 abort_hook_t Arguments::_abort_hook = nullptr;
114 exit_hook_t Arguments::_exit_hook = nullptr;
115 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
116
117
118 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
119 SystemProperty *Arguments::_java_library_path = nullptr;
120 SystemProperty *Arguments::_java_home = nullptr;
121 SystemProperty *Arguments::_java_class_path = nullptr;
122 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
123 SystemProperty *Arguments::_vm_info = nullptr;
124
125 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
126 PathString *Arguments::_boot_class_path = nullptr;
127 bool Arguments::_has_jimage = false;
128
129 char* Arguments::_ext_dirs = nullptr;
130
131 // True if -Xshare:auto option was specified.
132 static bool xshare_auto_cmd_line = false;
133
134 // True if -Xint/-Xmixed/-Xcomp were specified
135 static bool mode_flag_cmd_line = false;
136
137 struct VMInitArgsGroup {
138 const JavaVMInitArgs* _args;
139 JVMFlagOrigin _origin;
140 };
141
142 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
143 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
144 if (new_value == nullptr) {
145 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
146 return false;
147 }
148 if (_value != nullptr) {
149 FreeHeap(_value);
150 }
151 _value = new_value;
152 strcpy(_value, value);
153 return true;
154 }
155
156 void PathString::append_value(const char *value) {
157 char *sp;
158 size_t len = 0;
159 if (value != nullptr) {
160 len = strlen(value);
161 if (_value != nullptr) {
162 len += strlen(_value);
163 }
164 sp = AllocateHeap(len+2, mtArguments);
165 assert(sp != nullptr, "Unable to allocate space for new append path value");
166 if (sp != nullptr) {
167 if (_value != nullptr) {
168 strcpy(sp, _value);
169 strcat(sp, os::path_separator());
170 strcat(sp, value);
171 FreeHeap(_value);
172 } else {
173 strcpy(sp, value);
174 }
175 _value = sp;
176 }
177 }
178 }
179
180 PathString::PathString(const char* value) {
181 if (value == nullptr) {
182 _value = nullptr;
183 } else {
184 _value = AllocateHeap(strlen(value)+1, mtArguments);
185 strcpy(_value, value);
186 }
187 }
188
189 PathString::~PathString() {
190 if (_value != nullptr) {
191 FreeHeap(_value);
192 _value = nullptr;
193 }
194 }
195
196 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
197 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
198 size_t len = strlen(module_name) + 1;
199 _module_name = AllocateHeap(len, mtInternal);
200 strncpy(_module_name, module_name, len); // copy the trailing null
201 _path = new PathString(path);
202 }
203
204 ModulePatchPath::~ModulePatchPath() {
205 if (_module_name != nullptr) {
206 FreeHeap(_module_name);
207 _module_name = nullptr;
208 }
209 if (_path != nullptr) {
210 delete _path;
211 _path = nullptr;
212 }
213 }
214
215 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
216 if (key == nullptr) {
217 _key = nullptr;
218 } else {
219 _key = AllocateHeap(strlen(key)+1, mtArguments);
220 strcpy(_key, key);
221 }
222 _next = nullptr;
223 _internal = internal;
224 _writeable = writeable;
225 }
226
227 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
228 // part of the option string.
229 static bool match_option(const JavaVMOption *option, const char* name,
230 const char** tail) {
231 size_t len = strlen(name);
232 if (strncmp(option->optionString, name, len) == 0) {
233 *tail = option->optionString + len;
234 return true;
235 } else {
236 return false;
237 }
238 }
239
240 // Check if 'option' matches 'name'. No "tail" is allowed.
241 static bool match_option(const JavaVMOption *option, const char* name) {
242 const char* tail = nullptr;
243 bool result = match_option(option, name, &tail);
244 if (tail != nullptr && *tail == '\0') {
245 return result;
246 } else {
247 return false;
248 }
249 }
250
251 // Return true if any of the strings in null-terminated array 'names' matches.
252 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
253 // the option must match exactly.
254 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
255 bool tail_allowed) {
256 for (/* empty */; *names != nullptr; ++names) {
257 if (match_option(option, *names, tail)) {
258 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
259 return true;
260 }
261 }
262 }
263 return false;
264 }
265
266 #if INCLUDE_JFR
267 static bool _has_jfr_option = false; // is using JFR
268
269 // return true on failure
270 static bool match_jfr_option(const JavaVMOption** option) {
271 assert((*option)->optionString != nullptr, "invariant");
272 char* tail = nullptr;
273 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_start_flight_recording_option(option, tail);
276 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_flight_recorder_option(option, tail);
279 }
280 return false;
281 }
282
283 bool Arguments::has_jfr_option() {
284 return _has_jfr_option;
285 }
286 #endif
287
288 static void logOption(const char* opt) {
289 if (PrintVMOptions) {
290 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
291 }
292 }
293
294 bool needs_module_property_warning = false;
295
296 #define MODULE_PROPERTY_PREFIX "jdk.module."
297 #define MODULE_PROPERTY_PREFIX_LEN 11
298 #define ADDEXPORTS "addexports"
299 #define ADDEXPORTS_LEN 10
300 #define ADDREADS "addreads"
301 #define ADDREADS_LEN 8
302 #define ADDOPENS "addopens"
303 #define ADDOPENS_LEN 8
304 #define PATCH "patch"
305 #define PATCH_LEN 5
306 #define ADDMODS "addmods"
307 #define ADDMODS_LEN 7
308 #define LIMITMODS "limitmods"
309 #define LIMITMODS_LEN 9
310 #define PATH "path"
311 #define PATH_LEN 4
312 #define UPGRADE_PATH "upgrade.path"
313 #define UPGRADE_PATH_LEN 12
314 #define ENABLE_NATIVE_ACCESS "enable.native.access"
315 #define ENABLE_NATIVE_ACCESS_LEN 20
316 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
317 #define ILLEGAL_NATIVE_ACCESS_LEN 21
318 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
319 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
320 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
321 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
322
323 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
324 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
325 return ((strncmp(option, property, len) == 0) &&
326 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
327 }
328
329 // Return true if property starts with "jdk.module." and its ensuing chars match
330 // any of the reserved module properties.
331 // property should be passed without the leading "-D".
332 bool Arguments::is_internal_module_property(const char* property) {
333 return internal_module_property_helper(property, false);
334 }
335
336 // Returns true if property is one of those recognized by is_internal_module_property() but
337 // is not supported by CDS archived full module graph.
338 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
339 return internal_module_property_helper(property, true);
340 }
341
342 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
343 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
344 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
345 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
346 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
347 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
348 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
349 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
350 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
351 return true;
352 }
353
354 if (!check_for_cds) {
355 // CDS notes: these properties are supported by CDS archived full module graph.
356 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
357 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
358 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
359 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
360 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
361 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
362 return true;
363 }
364 }
365 }
366 return false;
367 }
368
369 // Process java launcher properties.
370 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
371 // See if sun.java.launcher is defined.
372 // Must do this before setting up other system properties,
373 // as some of them may depend on launcher type.
374 for (int index = 0; index < args->nOptions; index++) {
375 const JavaVMOption* option = args->options + index;
376 const char* tail;
377
378 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
379 process_java_launcher_argument(tail, option->extraInfo);
380 continue;
381 }
382 if (match_option(option, "-XX:+ExecutingUnitTests")) {
383 _executing_unit_tests = true;
384 continue;
385 }
386 }
387 }
388
389 // Initialize system properties key and value.
390 void Arguments::init_system_properties() {
391
392 // Set up _boot_class_path which is not a property but
393 // relies heavily on argument processing and the jdk.boot.class.path.append
394 // property. It is used to store the underlying boot class path.
395 _boot_class_path = new PathString(nullptr);
396
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
398 "Java Virtual Machine Specification", false));
399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
402
403 // Initialize the vm.info now, but it will need updating after argument parsing.
404 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
405
406 // Following are JVMTI agent writable properties.
407 // Properties values are set to nullptr and they are
408 // os specific they are initialized in os::init_system_properties_values().
409 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
410 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
411 _java_home = new SystemProperty("java.home", nullptr, true);
412 _java_class_path = new SystemProperty("java.class.path", "", true);
413 // jdk.boot.class.path.append is a non-writeable, internal property.
414 // It can only be set by either:
415 // - -Xbootclasspath/a:
416 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
417 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
418
419 // Add to System Property list.
420 PropertyList_add(&_system_properties, _sun_boot_library_path);
421 PropertyList_add(&_system_properties, _java_library_path);
422 PropertyList_add(&_system_properties, _java_home);
423 PropertyList_add(&_system_properties, _java_class_path);
424 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
425 PropertyList_add(&_system_properties, _vm_info);
426
427 // Set OS specific system properties values
428 os::init_system_properties_values();
429 }
430
431 // Update/Initialize System properties after JDK version number is known
432 void Arguments::init_version_specific_system_properties() {
433 enum { bufsz = 16 };
434 char buffer[bufsz];
435 const char* spec_vendor = "Oracle Corporation";
436 uint32_t spec_version = JDK_Version::current().major_version();
437
438 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
439
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.specification.version", buffer, false));
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
446 }
447
448 /*
449 * -XX argument processing:
450 *
451 * -XX arguments are defined in several places, such as:
452 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
453 * -XX arguments are parsed in parse_argument().
454 * -XX argument bounds checking is done in check_vm_args_consistency().
455 *
456 * Over time -XX arguments may change. There are mechanisms to handle common cases:
457 *
458 * ALIASED: An option that is simply another name for another option. This is often
459 * part of the process of deprecating a flag, but not all aliases need
460 * to be deprecated.
461 *
462 * Create an alias for an option by adding the old and new option names to the
463 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
464 *
465 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
466 * support may be removed in the future. Both regular and aliased options may be
467 * deprecated.
468 *
469 * Add a deprecation warning for an option (or alias) by adding an entry in the
470 * "special_jvm_flags" table and setting the "deprecated_in" field.
471 * Often an option "deprecated" in one major release will
472 * be made "obsolete" in the next. In this case the entry should also have its
473 * "obsolete_in" field set.
474 *
475 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
476 * on the command line. A warning is printed to let the user know that option might not
477 * be accepted in the future.
478 *
479 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
480 * table and setting the "obsolete_in" field.
481 *
482 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
483 * to the current JDK version. The system will flatly refuse to admit the existence of
484 * the flag. This allows a flag to die automatically over JDK releases.
485 *
486 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
487 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
488 * - Newly obsolete or expired deprecated options should have their global variable
489 * definitions removed (from globals.hpp, etc) and related implementations removed.
490 *
491 * Recommended approach for removing options:
492 *
493 * To remove options commonly used by customers (e.g. product -XX options), use
494 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
495 *
496 * To remove internal options (e.g. diagnostic, experimental, develop options), use
497 * a 2-step model adding major release numbers to the obsolete and expire columns.
498 *
499 * To change the name of an option, use the alias table as well as a 2-step
500 * model adding major release numbers to the deprecate and expire columns.
501 * Think twice about aliasing commonly used customer options.
502 *
503 * There are times when it is appropriate to leave a future release number as undefined.
504 *
505 * Tests: Aliases should be tested in VMAliasOptions.java.
506 * Deprecated options should be tested in VMDeprecatedOptions.java.
507 */
508
509 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
510 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
511 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
512 // the command-line as usual, but will issue a warning.
513 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
514 // the command-line, while issuing a warning and ignoring the flag value.
515 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
516 // existence of the flag.
517 //
518 // MANUAL CLEANUP ON JDK VERSION UPDATES:
519 // This table ensures that the handling of options will update automatically when the JDK
520 // version is incremented, but the source code needs to be cleanup up manually:
521 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
522 // variable should be removed, as well as users of the variable.
523 // - As "deprecated" options age into "obsolete" options, move the entry into the
524 // "Obsolete Flags" section of the table.
525 // - All expired options should be removed from the table.
526 static SpecialFlag const special_jvm_flags[] = {
527 // -------------- Deprecated Flags --------------
528 // --- Non-alias flags - sorted by obsolete_in then expired_in:
529 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
530 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
532 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
533 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
534 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
535 { "CompilationMode", JDK_Version::jdk(28), JDK_Version::jdk(29), JDK_Version::jdk(30)},
536 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
537 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
538 { "InitiatingHeapOccupancyPercent", JDK_Version::jdk(27), JDK_Version::jdk(28), JDK_Version::jdk(29) },
539 { "AlwaysCompileLoopMethods", JDK_Version::jdk(27), JDK_Version::jdk(28), JDK_Version::jdk(29) },
540
541 // -------------- Obsolete Flags - sorted by expired_in --------------
542
543 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
544 #if defined(AARCH64)
545 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
546 #endif
547 #ifdef _LP64
548 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
549 #endif
550
551 #ifdef ASSERT
552 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
553 #endif
554
555 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
556 // These entries will generate build errors. Their purpose is to test the macros.
557 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
558 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
559 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
560 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
561 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
562 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
563 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
564 #endif
565
566 { nullptr, JDK_Version(0), JDK_Version(0) }
567 };
568
569 // Flags that are aliases for other flags.
570 typedef struct {
571 const char* alias_name;
572 const char* real_name;
573 } AliasedFlag;
574
575 static AliasedFlag const aliased_jvm_flags[] = {
576 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
577 G1GC_ONLY({"InitiatingHeapOccupancyPercent" COMMA "G1IHOP" } COMMA)
578 { nullptr, nullptr}
579 };
580
581 // Return true if "v" is less than "other", where "other" may be "undefined".
582 static bool version_less_than(JDK_Version v, JDK_Version other) {
583 assert(!v.is_undefined(), "must be defined");
584 if (!other.is_undefined() && v.compare(other) >= 0) {
585 return false;
586 } else {
587 return true;
588 }
589 }
590
591 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
592 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
593 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
594 flag = special_jvm_flags[i];
595 return true;
596 }
597 }
598 return false;
599 }
600
601 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
602 assert(version != nullptr, "Must provide a version buffer");
603 SpecialFlag flag;
604 if (lookup_special_flag(flag_name, flag)) {
605 if (!flag.obsolete_in.is_undefined()) {
606 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
607 *version = flag.obsolete_in;
608 // This flag may have been marked for obsoletion in this version, but we may not
609 // have actually removed it yet. Rather than ignoring it as soon as we reach
610 // this version we allow some time for the removal to happen. So if the flag
611 // still actually exists we process it as normal, but issue an adjusted warning.
612 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
613 if (real_flag != nullptr) {
614 char version_str[256];
615 version->to_string(version_str, sizeof(version_str));
616 warning("Temporarily processing option %s; support is scheduled for removal in %s",
617 flag_name, version_str);
618 return false;
619 }
620 return true;
621 }
622 }
623 }
624 return false;
625 }
626
627 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
628 assert(version != nullptr, "Must provide a version buffer");
629 SpecialFlag flag;
630 if (lookup_special_flag(flag_name, flag)) {
631 if (!flag.deprecated_in.is_undefined()) {
632 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
633 version_less_than(JDK_Version::current(), flag.expired_in)) {
634 *version = flag.deprecated_in;
635 return 1;
636 } else {
637 return -1;
638 }
639 }
640 }
641 return 0;
642 }
643
644 const char* Arguments::real_flag_name(const char *flag_name) {
645 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
646 const AliasedFlag& flag_status = aliased_jvm_flags[i];
647 if (strcmp(flag_status.alias_name, flag_name) == 0) {
648 return flag_status.real_name;
649 }
650 }
651 return flag_name;
652 }
653
654 #ifdef ASSERT
655 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
656 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
657 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
658 return true;
659 }
660 }
661 return false;
662 }
663
664 // Verifies the correctness of the entries in the special_jvm_flags table.
665 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
666 // version being earlier than the deprecation version, then a warning is issued
667 // and verification fails - by returning false. If it is detected that the table
668 // is out of date, with respect to the current version, then ideally a warning is
669 // issued but verification does not fail. This allows the VM to operate when the
670 // version is first updated, without needing to update all the impacted flags at
671 // the same time. In practice we can't issue the warning immediately when the version
672 // is updated as it occurs for every test and some tests are not prepared to handle
673 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
674 // if the check_globals flag is true, and in addition allow a grace period and only
675 // check for stale flags when we hit build 25 (which is far enough into the 6 month
676 // release cycle that all flag updates should have been processed, whilst still
677 // leaving time to make the change before RDP2).
678 // We use a gtest to call this, passing true, so that we can detect stale flags before
679 // the end of the release cycle.
680
681 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
682
683 bool Arguments::verify_special_jvm_flags(bool check_globals) {
684 bool success = true;
685 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
686 const SpecialFlag& flag = special_jvm_flags[i];
687 if (lookup_special_flag(flag.name, i)) {
688 warning("Duplicate special flag declaration \"%s\"", flag.name);
689 success = false;
690 }
691 if (flag.deprecated_in.is_undefined() &&
692 flag.obsolete_in.is_undefined()) {
693 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
694 success = false;
695 }
696
697 if (!flag.deprecated_in.is_undefined()) {
698 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
699 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
700 success = false;
701 }
702
703 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
704 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
705 success = false;
706 }
707 }
708
709 if (!flag.obsolete_in.is_undefined()) {
710 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
711 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
712 success = false;
713 }
714
715 // if flag has become obsolete it should not have a "globals" flag defined anymore.
716 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
717 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
718 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
719 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
720 success = false;
721 }
722 }
723
724 } else if (!flag.expired_in.is_undefined()) {
725 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
726 success = false;
727 }
728
729 if (!flag.expired_in.is_undefined()) {
730 // if flag has become expired it should not have a "globals" flag defined anymore.
731 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
732 !version_less_than(JDK_Version::current(), flag.expired_in)) {
733 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
734 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
735 success = false;
736 }
737 }
738 }
739 }
740 return success;
741 }
742 #endif
743
744 bool Arguments::atojulong(const char *s, julong* result) {
745 return parse_integer(s, result);
746 }
747
748 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
749 if (size < min_size) return arg_too_small;
750 if (size > max_size) return arg_too_big;
751 return arg_in_range;
752 }
753
754 // Describe an argument out of range error
755 void Arguments::describe_range_error(ArgsRange errcode) {
756 switch(errcode) {
757 case arg_too_big:
758 jio_fprintf(defaultStream::error_stream(),
759 "The specified size exceeds the maximum "
760 "representable size.\n");
761 break;
762 case arg_too_small:
763 case arg_unreadable:
764 case arg_in_range:
765 // do nothing for now
766 break;
767 default:
768 ShouldNotReachHere();
769 }
770 }
771
772 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
773 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
774 return true;
775 } else {
776 return false;
777 }
778 }
779
780 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
781 // strtod allows leading whitespace, but our flag format does not.
782 if (*value == '\0' || isspace((unsigned char) *value)) {
783 return false;
784 }
785 char* end;
786 errno = 0;
787 double v = strtod(value, &end);
788 if ((errno != 0) || (*end != 0)) {
789 return false;
790 }
791 if (g_isnan(v) || !g_isfinite(v)) {
792 // Currently we cannot handle these special values.
793 return false;
794 }
795
796 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
797 return true;
798 }
799 return false;
800 }
801
802 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
803 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
804
805 if (flag->is_int()) {
806 int v;
807 if (parse_integer(value, &v)) {
808 result = JVMFlagAccess::set_int(flag, &v, origin);
809 }
810 } else if (flag->is_uint()) {
811 uint v;
812 if (parse_integer(value, &v)) {
813 result = JVMFlagAccess::set_uint(flag, &v, origin);
814 }
815 } else if (flag->is_intx()) {
816 intx v;
817 if (parse_integer(value, &v)) {
818 result = JVMFlagAccess::set_intx(flag, &v, origin);
819 }
820 } else if (flag->is_uintx()) {
821 uintx v;
822 if (parse_integer(value, &v)) {
823 result = JVMFlagAccess::set_uintx(flag, &v, origin);
824 }
825 } else if (flag->is_uint64_t()) {
826 uint64_t v;
827 if (parse_integer(value, &v)) {
828 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
829 }
830 } else if (flag->is_size_t()) {
831 size_t v;
832 if (parse_integer(value, &v)) {
833 result = JVMFlagAccess::set_size_t(flag, &v, origin);
834 }
835 }
836
837 return result == JVMFlag::SUCCESS;
838 }
839
840 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
841 if (value[0] == '\0') {
842 value = nullptr;
843 }
844 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
845 // Contract: JVMFlag always returns a pointer that needs freeing.
846 FREE_C_HEAP_ARRAY(value);
847 return true;
848 }
849
850 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
851 const char* old_value = "";
852 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
853 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
854 size_t new_len = strlen(new_value);
855 const char* value;
856 char* free_this_too = nullptr;
857 if (old_len == 0) {
858 value = new_value;
859 } else if (new_len == 0) {
860 value = old_value;
861 } else {
862 size_t length = old_len + 1 + new_len + 1;
863 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
864 // each new setting adds another LINE to the switch:
865 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
866 value = buf;
867 free_this_too = buf;
868 }
869 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
870 // JVMFlag always returns a pointer that needs freeing.
871 FREE_C_HEAP_ARRAY(value);
872 // JVMFlag made its own copy, so I must delete my own temp. buffer.
873 FREE_C_HEAP_ARRAY(free_this_too);
874 return true;
875 }
876
877 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
878 const char* real_name = real_flag_name(arg);
879 JDK_Version since = JDK_Version();
880 switch (is_deprecated_flag(arg, &since)) {
881 case -1: {
882 // Obsolete or expired, so don't process normally,
883 // but allow for an obsolete flag we're still
884 // temporarily allowing.
885 if (!is_obsolete_flag(arg, &since)) {
886 return real_name;
887 }
888 // Note if we're not considered obsolete then we can't be expired either
889 // as obsoletion must come first.
890 return nullptr;
891 }
892 case 0:
893 return real_name;
894 case 1: {
895 char version[256];
896 since.to_string(version, sizeof(version));
897 if (real_name != arg) {
898 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
899 arg, version, real_name);
900 } else {
901 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
902 arg, version);
903 }
904 return real_name;
905 }
906 }
907 ShouldNotReachHere();
908 return nullptr;
909 }
910
911 #define BUFLEN 255
912
913 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
914 char name_copied[BUFLEN+1];
915 if (name[name_length] != 0) {
916 if (name_length > BUFLEN) {
917 return nullptr;
918 } else {
919 strncpy(name_copied, name, name_length);
920 name_copied[name_length] = '\0';
921 name = name_copied;
922 }
923 }
924
925 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
926 if (real_name == nullptr) {
927 return nullptr;
928 }
929 JVMFlag* flag = JVMFlag::find_flag(real_name);
930 return flag;
931 }
932
933 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
934 bool is_bool = false;
935 bool bool_val = false;
936 char c = *arg;
937 if (c == '+' || c == '-') {
938 is_bool = true;
939 bool_val = (c == '+');
940 arg++;
941 }
942
943 const char* name = arg;
944 while (true) {
945 c = *arg;
946 if (isalnum(c) || (c == '_')) {
947 ++arg;
948 } else {
949 break;
950 }
951 }
952
953 size_t name_len = size_t(arg - name);
954 if (name_len == 0) {
955 return false;
956 }
957
958 JVMFlag* flag = find_jvm_flag(name, name_len);
959 if (flag == nullptr) {
960 return false;
961 }
962
963 if (is_bool) {
964 if (*arg != 0) {
965 // Error -- extra characters such as -XX:+BoolFlag=123
966 return false;
967 }
968 return set_bool_flag(flag, bool_val, origin);
969 }
970
971 if (arg[0] == '=') {
972 const char* value = arg + 1;
973 if (flag->is_ccstr()) {
974 if (flag->ccstr_accumulates()) {
975 return append_to_string_flag(flag, value, origin);
976 } else {
977 return set_string_flag(flag, value, origin);
978 }
979 } else if (flag->is_double()) {
980 return set_fp_numeric_flag(flag, value, origin);
981 } else {
982 return set_numeric_flag(flag, value, origin);
983 }
984 }
985
986 if (arg[0] == ':' && arg[1] == '=') {
987 // -XX:Foo:=xxx will reset the string flag to the given value.
988 const char* value = arg + 2;
989 return set_string_flag(flag, value, origin);
990 }
991
992 return false;
993 }
994
995 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
996 assert(bldarray != nullptr, "illegal argument");
997
998 if (arg == nullptr) {
999 return;
1000 }
1001
1002 int new_count = *count + 1;
1003
1004 // expand the array and add arg to the last element
1005 if (*bldarray == nullptr) {
1006 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1007 } else {
1008 *bldarray = REALLOC_C_HEAP_ARRAY(*bldarray, new_count, mtArguments);
1009 }
1010 (*bldarray)[*count] = os::strdup_check_oom(arg);
1011 *count = new_count;
1012 }
1013
1014 void Arguments::build_jvm_args(const char* arg) {
1015 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1016 }
1017
1018 void Arguments::build_jvm_flags(const char* arg) {
1019 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1020 }
1021
1022 // utility function to return a string that concatenates all
1023 // strings in a given char** array
1024 const char* Arguments::build_resource_string(char** args, int count) {
1025 if (args == nullptr || count == 0) {
1026 return nullptr;
1027 }
1028 size_t length = 0;
1029 for (int i = 0; i < count; i++) {
1030 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1031 }
1032 char* s = NEW_RESOURCE_ARRAY(char, length);
1033 char* dst = s;
1034 for (int j = 0; j < count; j++) {
1035 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1036 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1037 dst += offset;
1038 length -= offset;
1039 }
1040 return (const char*) s;
1041 }
1042
1043 void Arguments::print_on(outputStream* st) {
1044 st->print_cr("VM Arguments:");
1045 if (num_jvm_flags() > 0) {
1046 st->print("jvm_flags: "); print_jvm_flags_on(st);
1047 st->cr();
1048 }
1049 if (num_jvm_args() > 0) {
1050 st->print("jvm_args: "); print_jvm_args_on(st);
1051 st->cr();
1052 }
1053 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1054 if (_java_class_path != nullptr) {
1055 char* path = _java_class_path->value();
1056 size_t len = strlen(path);
1057 st->print("java_class_path (initial): ");
1058 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1059 if (len == 0) {
1060 st->print_raw_cr("<not set>");
1061 } else {
1062 st->print_raw_cr(path, len);
1063 }
1064 }
1065 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1066 }
1067
1068 void Arguments::print_summary_on(outputStream* st) {
1069 // Print the command line. Environment variables that are helpful for
1070 // reproducing the problem are written later in the hs_err file.
1071 // flags are from setting file
1072 if (num_jvm_flags() > 0) {
1073 st->print_raw("Settings File: ");
1074 print_jvm_flags_on(st);
1075 st->cr();
1076 }
1077 // args are the command line and environment variable arguments.
1078 st->print_raw("Command Line: ");
1079 if (num_jvm_args() > 0) {
1080 print_jvm_args_on(st);
1081 }
1082 // this is the classfile and any arguments to the java program
1083 if (java_command() != nullptr) {
1084 st->print("%s", java_command());
1085 }
1086 st->cr();
1087 }
1088
1089 void Arguments::set_jvm_flags_file(const char *value) {
1090 if (_jvm_flags_file != nullptr) {
1091 os::free(_jvm_flags_file);
1092 }
1093 _jvm_flags_file = os::strdup_check_oom(value);
1094 }
1095
1096 void Arguments::print_jvm_flags_on(outputStream* st) {
1097 if (_num_jvm_flags > 0) {
1098 for (int i=0; i < _num_jvm_flags; i++) {
1099 st->print("%s ", _jvm_flags_array[i]);
1100 }
1101 }
1102 }
1103
1104 void Arguments::print_jvm_args_on(outputStream* st) {
1105 if (_num_jvm_args > 0) {
1106 for (int i=0; i < _num_jvm_args; i++) {
1107 st->print("%s ", _jvm_args_array[i]);
1108 }
1109 }
1110 }
1111
1112 bool Arguments::process_argument(const char* arg,
1113 jboolean ignore_unrecognized,
1114 JVMFlagOrigin origin) {
1115 JDK_Version since = JDK_Version();
1116
1117 if (parse_argument(arg, origin)) {
1118 return true;
1119 }
1120
1121 // Determine if the flag has '+', '-', or '=' characters.
1122 bool has_plus_minus = (*arg == '+' || *arg == '-');
1123 const char* const argname = has_plus_minus ? arg + 1 : arg;
1124
1125 size_t arg_len;
1126 const char* equal_sign = strchr(argname, '=');
1127 if (equal_sign == nullptr) {
1128 arg_len = strlen(argname);
1129 } else {
1130 arg_len = equal_sign - argname;
1131 }
1132
1133 // Only make the obsolete check for valid arguments.
1134 if (arg_len <= BUFLEN) {
1135 // Construct a string which consists only of the argument name without '+', '-', or '='.
1136 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1137 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1138 if (is_obsolete_flag(stripped_argname, &since)) {
1139 char version[256];
1140 since.to_string(version, sizeof(version));
1141 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1142 return true;
1143 }
1144 }
1145
1146 // For locked flags, report a custom error message if available.
1147 // Otherwise, report the standard unrecognized VM option.
1148 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1149 if (found_flag != nullptr) {
1150 char locked_message_buf[BUFLEN];
1151 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1152 if (strlen(locked_message_buf) != 0) {
1153 #ifdef PRODUCT
1154 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1155 if (ignore_unrecognized && mismatched) {
1156 return true;
1157 }
1158 #endif
1159 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1160 }
1161 if (found_flag->is_bool() && !has_plus_minus) {
1162 jio_fprintf(defaultStream::error_stream(),
1163 "Missing +/- setting for VM option '%s'\n", argname);
1164 } else if (!found_flag->is_bool() && has_plus_minus) {
1165 jio_fprintf(defaultStream::error_stream(),
1166 "Unexpected +/- setting in VM option '%s'\n", argname);
1167 } else {
1168 jio_fprintf(defaultStream::error_stream(),
1169 "Improperly specified VM option '%s'\n", argname);
1170 }
1171 } else {
1172 if (ignore_unrecognized) {
1173 return true;
1174 }
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Unrecognized VM option '%s'\n", argname);
1177 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1178 if (fuzzy_matched != nullptr) {
1179 jio_fprintf(defaultStream::error_stream(),
1180 "Did you mean '%s%s%s'?\n",
1181 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1182 fuzzy_matched->name(),
1183 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1184 }
1185 }
1186
1187 // allow for commandline "commenting out" options like -XX:#+Verbose
1188 return arg[0] == '#';
1189 }
1190
1191 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1192 FILE* stream = os::fopen(file_name, "rb");
1193 if (stream == nullptr) {
1194 if (should_exist) {
1195 jio_fprintf(defaultStream::error_stream(),
1196 "Could not open settings file %s\n", file_name);
1197 return false;
1198 } else {
1199 return true;
1200 }
1201 }
1202
1203 char token[1024];
1204 size_t pos = 0;
1205
1206 bool in_white_space = true;
1207 bool in_comment = false;
1208 bool in_quote = false;
1209 char quote_c = 0;
1210 bool result = true;
1211
1212 int c_or_eof = getc(stream);
1213 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1214 // We have checked the c_or_eof for EOF. getc should only ever return the
1215 // EOF or an unsigned char converted to an int. We cast down to a char to
1216 // avoid the char to int promotions we would otherwise do in the comparisons
1217 // below (which would be incorrect if we ever compared to a non-ascii char),
1218 // and the int to char conversions we would otherwise do in the assignments.
1219 const char c = static_cast<char>(c_or_eof);
1220 if (in_white_space) {
1221 if (in_comment) {
1222 if (c == '\n') in_comment = false;
1223 } else {
1224 if (c == '#') in_comment = true;
1225 else if (!isspace((unsigned char) c)) {
1226 in_white_space = false;
1227 token[pos++] = c;
1228 }
1229 }
1230 } else {
1231 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1232 // token ends at newline, or at unquoted whitespace
1233 // this allows a way to include spaces in string-valued options
1234 token[pos] = '\0';
1235 logOption(token);
1236 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1237 build_jvm_flags(token);
1238 pos = 0;
1239 in_white_space = true;
1240 in_quote = false;
1241 } else if (!in_quote && (c == '\'' || c == '"')) {
1242 in_quote = true;
1243 quote_c = c;
1244 } else if (in_quote && (c == quote_c)) {
1245 in_quote = false;
1246 } else {
1247 token[pos++] = c;
1248 }
1249 }
1250 c_or_eof = getc(stream);
1251 }
1252 if (pos > 0) {
1253 token[pos] = '\0';
1254 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1255 build_jvm_flags(token);
1256 }
1257 fclose(stream);
1258 return result;
1259 }
1260
1261 //=============================================================================================================
1262 // Parsing of properties (-D)
1263
1264 const char* Arguments::get_property(const char* key) {
1265 return PropertyList_get_value(system_properties(), key);
1266 }
1267
1268 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1269 const char* eq = strchr(prop, '=');
1270 const char* key;
1271 const char* value = "";
1272
1273 if (eq == nullptr) {
1274 // property doesn't have a value, thus use passed string
1275 key = prop;
1276 } else {
1277 // property have a value, thus extract it and save to the
1278 // allocated string
1279 size_t key_len = eq - prop;
1280 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1281
1282 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1283 key = tmp_key;
1284
1285 value = &prop[key_len + 1];
1286 }
1287
1288 if (internal == ExternalProperty) {
1289 CDSConfig::check_incompatible_property(key, value);
1290 }
1291
1292 if (strcmp(key, "java.compiler") == 0) {
1293 // we no longer support java.compiler system property, log a warning and let it get
1294 // passed to Java, like any other system property
1295 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1296 // for applications using NONE or empty value, log a more informative message
1297 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1298 } else {
1299 warning("The java.compiler system property is obsolete and no longer supported.");
1300 }
1301 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1302 // append is true, writable is true, internal is false
1303 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1304 WriteableProperty, ExternalProperty);
1305 } else {
1306 if (strcmp(key, "sun.java.command") == 0) {
1307 char *old_java_command = _java_command;
1308 _java_command = os::strdup_check_oom(value, mtArguments);
1309 if (old_java_command != nullptr) {
1310 os::free(old_java_command);
1311 }
1312 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1313 // If this property is set on the command line then its value will be
1314 // displayed in VM error logs as the URL at which to submit such logs.
1315 // Normally the URL displayed in error logs is different from the value
1316 // of this system property, so a different property should have been
1317 // used here, but we leave this as-is in case someone depends upon it.
1318 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1319 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1320 // its value without going through the property list or making a Java call.
1321 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1322 if (old_java_vendor_url_bug != nullptr) {
1323 os::free((void *)old_java_vendor_url_bug);
1324 }
1325 }
1326
1327 // Create new property and add at the end of the list
1328 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1329 }
1330
1331 if (key != prop) {
1332 // SystemProperty copy passed value, thus free previously allocated
1333 // memory
1334 FreeHeap((void *)key);
1335 }
1336
1337 return true;
1338 }
1339
1340 //===========================================================================================================
1341 // Setting int/mixed/comp mode flags
1342
1343 void Arguments::set_mode_flags(Mode mode) {
1344 // Set up default values for all flags.
1345 // If you add a flag to any of the branches below,
1346 // add a default value for it here.
1347 _mode = mode;
1348
1349 // Ensure Agent_OnLoad has the correct initial values.
1350 // This may not be the final mode; mode may change later in onload phase.
1351 PropertyList_unique_add(&_system_properties, "java.vm.info",
1352 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1353
1354 UseInterpreter = true;
1355 UseCompiler = true;
1356 UseLoopCounter = true;
1357
1358 // Default values may be platform/compiler dependent -
1359 // use the saved values
1360 ClipInlining = Arguments::_ClipInlining;
1361 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1362 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1363 BackgroundCompilation = Arguments::_BackgroundCompilation;
1364
1365 // Change from defaults based on mode
1366 switch (mode) {
1367 default:
1368 ShouldNotReachHere();
1369 break;
1370 case _int:
1371 UseCompiler = false;
1372 UseLoopCounter = false;
1373 AlwaysCompileLoopMethods = false;
1374 UseOnStackReplacement = false;
1375 break;
1376 case _mixed:
1377 // same as default
1378 break;
1379 case _comp:
1380 UseInterpreter = false;
1381 BackgroundCompilation = false;
1382 ClipInlining = false;
1383 break;
1384 }
1385 }
1386
1387 // Conflict: required to use shared spaces (-Xshare:on), but
1388 // incompatible command line options were chosen.
1389 void Arguments::no_shared_spaces(const char* message) {
1390 if (RequireSharedSpaces) {
1391 aot_log_error(aot)("%s is incompatible with other specified options.",
1392 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1393 if (CDSConfig::new_aot_flags_used()) {
1394 vm_exit_during_initialization("Unable to use AOT cache", message);
1395 } else {
1396 vm_exit_during_initialization("Unable to use shared archive", message);
1397 }
1398 } else {
1399 if (CDSConfig::new_aot_flags_used()) {
1400 log_warning(aot)("Unable to use AOT cache: %s", message);
1401 } else {
1402 aot_log_info(aot)("Unable to use shared archive: %s", message);
1403 }
1404 UseSharedSpaces = false;
1405 }
1406 }
1407
1408 static void set_object_alignment() {
1409 // Object alignment.
1410 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1411 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1412 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1413 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1414 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1415 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1416
1417 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1418 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1419
1420 // Oop encoding heap max
1421 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1422 }
1423
1424 size_t Arguments::max_heap_for_compressed_oops() {
1425 // Avoid sign flip.
1426 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1427 // We need to fit both the null page and the heap into the memory budget, while
1428 // keeping alignment constraints of the heap. To guarantee the latter, as the
1429 // null page is located before the heap, we pad the null page to the conservative
1430 // maximum alignment that the GC may ever impose upon the heap.
1431 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1432 _conservative_max_heap_alignment);
1433
1434 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1435 NOT_LP64(ShouldNotReachHere(); return 0);
1436 }
1437
1438 void Arguments::set_use_compressed_oops() {
1439 #ifdef _LP64
1440 // MaxHeapSize is not set up properly at this point, but
1441 // the only value that can override MaxHeapSize if we are
1442 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1443 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1444
1445 if (max_heap_size <= max_heap_for_compressed_oops()) {
1446 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1447 FLAG_SET_ERGO(UseCompressedOops, true);
1448 }
1449 } else {
1450 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1451 warning("Max heap size too large for Compressed Oops");
1452 FLAG_SET_DEFAULT(UseCompressedOops, false);
1453 }
1454 }
1455 #endif // _LP64
1456 }
1457
1458 void Arguments::set_conservative_max_heap_alignment() {
1459 // The conservative maximum required alignment for the heap is the maximum of
1460 // the alignments imposed by several sources: any requirements from the heap
1461 // itself and the maximum page size we may run the VM with.
1462 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1463 _conservative_max_heap_alignment = MAX3(heap_alignment,
1464 os::vm_allocation_granularity(),
1465 os::max_page_size());
1466 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1467 }
1468
1469 jint Arguments::set_ergonomics_flags() {
1470 GCConfig::initialize();
1471
1472 set_conservative_max_heap_alignment();
1473
1474 #ifdef _LP64
1475 set_use_compressed_oops();
1476
1477 // Also checks that certain machines are slower with compressed oops
1478 // in vm_version initialization code.
1479 #endif // _LP64
1480
1481 return JNI_OK;
1482 }
1483
1484 // This must be called after ergonomics.
1485 void Arguments::set_bytecode_flags() {
1486 if (!RewriteBytecodes) {
1487 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1488 }
1489 }
1490
1491 // Aggressive optimization flags
1492 jint Arguments::set_aggressive_opts_flags() {
1493 #ifdef COMPILER2
1494 if (AggressiveUnboxing) {
1495 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1496 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1497 } else if (!EliminateAutoBox) {
1498 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1499 AggressiveUnboxing = false;
1500 }
1501 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1502 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1503 } else if (!DoEscapeAnalysis) {
1504 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1505 AggressiveUnboxing = false;
1506 }
1507 }
1508 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1509 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1510 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1511 }
1512 // Feed the cache size setting into the JDK
1513 char buffer[1024];
1514 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1515 if (!add_property(buffer)) {
1516 return JNI_ENOMEM;
1517 }
1518 }
1519 #endif
1520
1521 return JNI_OK;
1522 }
1523
1524 //===========================================================================================================
1525
1526 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1527 if (_sun_java_launcher != _default_java_launcher) {
1528 os::free(const_cast<char*>(_sun_java_launcher));
1529 }
1530 _sun_java_launcher = os::strdup_check_oom(launcher);
1531 }
1532
1533 bool Arguments::created_by_java_launcher() {
1534 assert(_sun_java_launcher != nullptr, "property must have value");
1535 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1536 }
1537
1538 bool Arguments::executing_unit_tests() {
1539 return _executing_unit_tests;
1540 }
1541
1542 //===========================================================================================================
1543 // Parsing of main arguments
1544
1545 static unsigned int addreads_count = 0;
1546 static unsigned int addexports_count = 0;
1547 static unsigned int addopens_count = 0;
1548 static unsigned int patch_mod_count = 0;
1549 static unsigned int enable_native_access_count = 0;
1550 static unsigned int enable_final_field_mutation = 0;
1551 static bool patch_mod_javabase = false;
1552
1553 // Check the consistency of vm_init_args
1554 bool Arguments::check_vm_args_consistency() {
1555 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1556 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1557 return false;
1558 }
1559
1560 // Method for adding checks for flag consistency.
1561 // The intent is to warn the user of all possible conflicts,
1562 // before returning an error.
1563 // Note: Needs platform-dependent factoring.
1564 bool status = true;
1565
1566 status = CompilerConfig::check_args_consistency(status);
1567 #if INCLUDE_JFR
1568 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1569 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1570 return false;
1571 }
1572 }
1573 #endif
1574
1575 #ifndef SUPPORT_RESERVED_STACK_AREA
1576 if (StackReservedPages != 0) {
1577 FLAG_SET_CMDLINE(StackReservedPages, 0);
1578 warning("Reserved Stack Area not supported on this platform");
1579 }
1580 #endif
1581
1582 return status;
1583 }
1584
1585 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1586 const char* option_type) {
1587 if (ignore) return false;
1588
1589 const char* spacer = " ";
1590 if (option_type == nullptr) {
1591 option_type = ++spacer; // Set both to the empty string.
1592 }
1593
1594 jio_fprintf(defaultStream::error_stream(),
1595 "Unrecognized %s%soption: %s\n", option_type, spacer,
1596 option->optionString);
1597 return true;
1598 }
1599
1600 static const char* user_assertion_options[] = {
1601 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1602 };
1603
1604 static const char* system_assertion_options[] = {
1605 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1606 };
1607
1608 bool Arguments::parse_uint(const char* value,
1609 uint* uint_arg,
1610 uint min_size) {
1611 uint n;
1612 if (!parse_integer(value, &n)) {
1613 return false;
1614 }
1615 if (n >= min_size) {
1616 *uint_arg = n;
1617 return true;
1618 } else {
1619 return false;
1620 }
1621 }
1622
1623 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1624 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1625 CDSConfig::check_internal_module_property(prop_name, prop_value);
1626 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1627 char* property = AllocateHeap(prop_len, mtArguments);
1628 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1629 if (ret < 0 || ret >= (int)prop_len) {
1630 FreeHeap(property);
1631 return false;
1632 }
1633 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1634 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1635 // that multiple occurrences of the associated flag just causes the existing property value to be
1636 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1637 // to a property after we have finished flag processing.
1638 bool added = add_property(property, WriteableProperty, internal);
1639 FreeHeap(property);
1640 return added;
1641 }
1642
1643 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1644 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1645 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1646 const unsigned int props_count_limit = 1000;
1647 const int max_digits = 3;
1648 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1649
1650 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1651 if (count < props_count_limit) {
1652 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1653 char* property = AllocateHeap(prop_len, mtArguments);
1654 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1655 if (ret < 0 || ret >= (int)prop_len) {
1656 FreeHeap(property);
1657 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1658 return false;
1659 }
1660 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1661 FreeHeap(property);
1662 return added;
1663 }
1664
1665 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1666 return false;
1667 }
1668
1669 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1670 julong* long_arg,
1671 julong min_size,
1672 julong max_size) {
1673 if (!parse_integer(s, long_arg)) return arg_unreadable;
1674 return check_memory_size(*long_arg, min_size, max_size);
1675 }
1676
1677 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1678 // Save default settings for some mode flags
1679 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1680 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1681 Arguments::_ClipInlining = ClipInlining;
1682 Arguments::_BackgroundCompilation = BackgroundCompilation;
1683
1684 // Remember the default value of SharedBaseAddress.
1685 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1686
1687 // Setup flags for mixed which is the default
1688 set_mode_flags(_mixed);
1689
1690 jint result;
1691 for (int i = 0; i < all_args->length(); i++) {
1692 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1693 if (result != JNI_OK) {
1694 return result;
1695 }
1696 }
1697
1698 // Disable CDS for exploded image
1699 if (!has_jimage()) {
1700 no_shared_spaces("CDS disabled on exploded JDK");
1701 }
1702
1703 // We need to ensure processor and memory resources have been properly
1704 // configured - which may rely on arguments we just processed - before
1705 // doing the final argument processing. Any argument processing that
1706 // needs to know about processor and memory resources must occur after
1707 // this point.
1708
1709 os::check_temp_directory();
1710 os::init_container_support();
1711
1712 SystemMemoryBarrier::initialize();
1713
1714 // Do final processing now that all arguments have been parsed
1715 result = finalize_vm_init_args();
1716 if (result != JNI_OK) {
1717 return result;
1718 }
1719
1720 return JNI_OK;
1721 }
1722
1723 #if !INCLUDE_JVMTI || INCLUDE_CDS
1724 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1725 // represents a valid JDWP agent. is_path==true denotes that we
1726 // are dealing with -agentpath (case where name is a path), otherwise with
1727 // -agentlib
1728 static bool valid_jdwp_agent(char *name, bool is_path) {
1729 char *_name;
1730 const char *_jdwp = "jdwp";
1731 size_t _len_jdwp, _len_prefix;
1732
1733 if (is_path) {
1734 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
1735 return false;
1736 }
1737
1738 _name++; // skip past last path separator
1739 _len_prefix = strlen(JNI_LIB_PREFIX);
1740
1741 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
1742 return false;
1743 }
1744
1745 _name += _len_prefix;
1746 _len_jdwp = strlen(_jdwp);
1747
1748 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
1749 _name += _len_jdwp;
1750 }
1751 else {
1752 return false;
1753 }
1754
1755 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
1756 return false;
1757 }
1758
1759 return true;
1760 }
1761
1762 if (strcmp(name, _jdwp) == 0) {
1763 return true;
1764 }
1765
1766 return false;
1767 }
1768 #endif
1769
1770 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
1771 // --patch-module=<module>=<file>(<pathsep><file>)*
1772 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
1773 // Find the equal sign between the module name and the path specification
1774 const char* module_equal = strchr(patch_mod_tail, '=');
1775 if (module_equal == nullptr) {
1776 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
1777 return JNI_ERR;
1778 } else {
1779 // Pick out the module name
1780 size_t module_len = module_equal - patch_mod_tail;
1781 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
1782 if (module_name != nullptr) {
1783 memcpy(module_name, patch_mod_tail, module_len);
1784 *(module_name + module_len) = '\0';
1785 // The path piece begins one past the module_equal sign
1786 add_patch_mod_prefix(module_name, module_equal + 1);
1787 FREE_C_HEAP_ARRAY(module_name);
1788 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
1789 return JNI_ENOMEM;
1790 }
1791 } else {
1792 return JNI_ENOMEM;
1793 }
1794 }
1795 return JNI_OK;
1796 }
1797
1798 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
1799 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
1800 // The min and max sizes match the values in globals.hpp, but scaled
1801 // with K. The values have been chosen so that alignment with page
1802 // size doesn't change the max value, which makes the conversions
1803 // back and forth between Xss value and ThreadStackSize value easier.
1804 // The values have also been chosen to fit inside a 32-bit signed type.
1805 const julong min_ThreadStackSize = 0;
1806 const julong max_ThreadStackSize = 1 * M;
1807
1808 // Make sure the above values match the range set in globals.hpp
1809 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
1810 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
1811 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
1812
1813 const julong min_size = min_ThreadStackSize * K;
1814 const julong max_size = max_ThreadStackSize * K;
1815
1816 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
1817
1818 julong size = 0;
1819 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
1820 if (errcode != arg_in_range) {
1821 bool silent = (option == nullptr); // Allow testing to silence error messages
1822 if (!silent) {
1823 jio_fprintf(defaultStream::error_stream(),
1824 "Invalid thread stack size: %s\n", option->optionString);
1825 describe_range_error(errcode);
1826 }
1827 return JNI_EINVAL;
1828 }
1829
1830 // Internally track ThreadStackSize in units of 1024 bytes.
1831 const julong size_aligned = align_up(size, K);
1832 assert(size <= size_aligned,
1833 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
1834 size, size_aligned);
1835
1836 const julong size_in_K = size_aligned / K;
1837 assert(size_in_K < (julong)max_intx,
1838 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
1839 size_in_K);
1840
1841 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
1842 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
1843 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
1844 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
1845 max_expanded, size_in_K);
1846
1847 *out_ThreadStackSize = (intx)size_in_K;
1848
1849 return JNI_OK;
1850 }
1851
1852 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
1853 // For match_option to return remaining or value part of option string
1854 const char* tail;
1855
1856 // iterate over arguments
1857 for (int index = 0; index < args->nOptions; index++) {
1858 bool is_absolute_path = false; // for -agentpath vs -agentlib
1859
1860 const JavaVMOption* option = args->options + index;
1861
1862 if (!match_option(option, "-Djava.class.path", &tail) &&
1863 !match_option(option, "-Dsun.java.command", &tail) &&
1864 !match_option(option, "-Dsun.java.launcher", &tail)) {
1865
1866 // add all jvm options to the jvm_args string. This string
1867 // is used later to set the java.vm.args PerfData string constant.
1868 // the -Djava.class.path and the -Dsun.java.command options are
1869 // omitted from jvm_args string as each have their own PerfData
1870 // string constant object.
1871 build_jvm_args(option->optionString);
1872 }
1873
1874 // -verbose:[class/module/gc/jni]
1875 if (match_option(option, "-verbose", &tail)) {
1876 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1877 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
1878 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
1879 } else if (!strcmp(tail, ":module")) {
1880 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
1881 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
1882 } else if (!strcmp(tail, ":gc")) {
1883 if (_legacyGCLogging.lastFlag == 0) {
1884 _legacyGCLogging.lastFlag = 1;
1885 }
1886 } else if (!strcmp(tail, ":jni")) {
1887 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
1888 }
1889 // -da / -ea / -disableassertions / -enableassertions
1890 // These accept an optional class/package name separated by a colon, e.g.,
1891 // -da:java.lang.Thread.
1892 } else if (match_option(option, user_assertion_options, &tail, true)) {
1893 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1894 if (*tail == '\0') {
1895 JavaAssertions::setUserClassDefault(enable);
1896 } else {
1897 assert(*tail == ':', "bogus match by match_option()");
1898 JavaAssertions::addOption(tail + 1, enable);
1899 }
1900 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1901 } else if (match_option(option, system_assertion_options, &tail, false)) {
1902 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1903 JavaAssertions::setSystemClassDefault(enable);
1904 // -bootclasspath:
1905 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1906 jio_fprintf(defaultStream::output_stream(),
1907 "-Xbootclasspath is no longer a supported option.\n");
1908 return JNI_EINVAL;
1909 // -bootclasspath/a:
1910 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1911 Arguments::append_sysclasspath(tail);
1912 // -bootclasspath/p:
1913 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1914 jio_fprintf(defaultStream::output_stream(),
1915 "-Xbootclasspath/p is no longer a supported option.\n");
1916 return JNI_EINVAL;
1917 // -Xrun
1918 } else if (match_option(option, "-Xrun", &tail)) {
1919 if (tail != nullptr) {
1920 const char* pos = strchr(tail, ':');
1921 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
1922 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
1923 jio_snprintf(name, len + 1, "%s", tail);
1924
1925 char *options = nullptr;
1926 if(pos != nullptr) {
1927 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1928 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
1929 }
1930 #if !INCLUDE_JVMTI
1931 if (strcmp(name, "jdwp") == 0) {
1932 jio_fprintf(defaultStream::error_stream(),
1933 "Debugging agents are not supported in this VM\n");
1934 return JNI_ERR;
1935 }
1936 #endif // !INCLUDE_JVMTI
1937 JvmtiAgentList::add_xrun(name, options, false);
1938 FREE_C_HEAP_ARRAY(name);
1939 FREE_C_HEAP_ARRAY(options);
1940 }
1941 } else if (match_option(option, "--add-reads=", &tail)) {
1942 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
1943 return JNI_ENOMEM;
1944 }
1945 } else if (match_option(option, "--add-exports=", &tail)) {
1946 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
1947 return JNI_ENOMEM;
1948 }
1949 } else if (match_option(option, "--add-opens=", &tail)) {
1950 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
1951 return JNI_ENOMEM;
1952 }
1953 } else if (match_option(option, "--add-modules=", &tail)) {
1954 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
1955 return JNI_ENOMEM;
1956 }
1957 } else if (match_option(option, "--enable-native-access=", &tail)) {
1958 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
1959 return JNI_ENOMEM;
1960 }
1961 } else if (match_option(option, "--illegal-native-access=", &tail)) {
1962 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
1963 return JNI_ENOMEM;
1964 }
1965 } else if (match_option(option, "--limit-modules=", &tail)) {
1966 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
1967 return JNI_ENOMEM;
1968 }
1969 } else if (match_option(option, "--module-path=", &tail)) {
1970 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
1971 return JNI_ENOMEM;
1972 }
1973 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
1974 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
1975 return JNI_ENOMEM;
1976 }
1977 } else if (match_option(option, "--patch-module=", &tail)) {
1978 // --patch-module=<module>=<file>(<pathsep><file>)*
1979 int res = process_patch_mod_option(tail);
1980 if (res != JNI_OK) {
1981 return res;
1982 }
1983 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
1984 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
1985 return JNI_ENOMEM;
1986 }
1987 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
1988 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
1989 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
1990 AddProperty, WriteableProperty, InternalProperty);
1991 } else {
1992 jio_fprintf(defaultStream::error_stream(),
1993 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
1994 return JNI_ERR;
1995 }
1996 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
1997 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
1998 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
1999 AddProperty, WriteableProperty, InternalProperty);
2000 } else {
2001 jio_fprintf(defaultStream::error_stream(),
2002 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2003 return JNI_ERR;
2004 }
2005 } else if (match_option(option, "--illegal-access=", &tail)) {
2006 char version[256];
2007 JDK_Version::jdk(17).to_string(version, sizeof(version));
2008 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2009 // -agentlib and -agentpath
2010 } else if (match_option(option, "-agentlib:", &tail) ||
2011 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2012 if(tail != nullptr) {
2013 const char* pos = strchr(tail, '=');
2014 char* name;
2015 if (pos == nullptr) {
2016 name = os::strdup_check_oom(tail, mtArguments);
2017 } else {
2018 size_t len = pos - tail;
2019 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2020 memcpy(name, tail, len);
2021 name[len] = '\0';
2022 }
2023
2024 char *options = nullptr;
2025 if(pos != nullptr) {
2026 options = os::strdup_check_oom(pos + 1, mtArguments);
2027 }
2028 #if !INCLUDE_JVMTI
2029 if (valid_jdwp_agent(name, is_absolute_path)) {
2030 jio_fprintf(defaultStream::error_stream(),
2031 "Debugging agents are not supported in this VM\n");
2032 return JNI_ERR;
2033 }
2034 #elif INCLUDE_CDS
2035 if (valid_jdwp_agent(name, is_absolute_path)) {
2036 _has_jdwp_agent = true;
2037 }
2038 #endif // !INCLUDE_JVMTI
2039 JvmtiAgentList::add(name, options, is_absolute_path);
2040 os::free(name);
2041 os::free(options);
2042 }
2043 // -javaagent
2044 } else if (match_option(option, "-javaagent:", &tail)) {
2045 #if !INCLUDE_JVMTI
2046 jio_fprintf(defaultStream::error_stream(),
2047 "Instrumentation agents are not supported in this VM\n");
2048 return JNI_ERR;
2049 #else
2050 if (tail != nullptr) {
2051 size_t length = strlen(tail) + 1;
2052 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2053 jio_snprintf(options, length, "%s", tail);
2054 JvmtiAgentList::add("instrument", options, false);
2055 FREE_C_HEAP_ARRAY(options);
2056
2057 // java agents need module java.instrument
2058 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2059 return JNI_ENOMEM;
2060 }
2061 }
2062 #endif // !INCLUDE_JVMTI
2063 // --enable_preview
2064 } else if (match_option(option, "--enable-preview")) {
2065 set_enable_preview();
2066 // -Xnoclassgc
2067 } else if (match_option(option, "-Xnoclassgc")) {
2068 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2069 return JNI_EINVAL;
2070 }
2071 // -Xbatch
2072 } else if (match_option(option, "-Xbatch")) {
2073 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2074 return JNI_EINVAL;
2075 }
2076 // -Xmn for compatibility with other JVM vendors
2077 } else if (match_option(option, "-Xmn", &tail)) {
2078 julong long_initial_young_size = 0;
2079 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2080 if (errcode != arg_in_range) {
2081 jio_fprintf(defaultStream::error_stream(),
2082 "Invalid initial young generation size: %s\n", option->optionString);
2083 describe_range_error(errcode);
2084 return JNI_EINVAL;
2085 }
2086 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2087 return JNI_EINVAL;
2088 }
2089 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2090 return JNI_EINVAL;
2091 }
2092 // -Xms
2093 } else if (match_option(option, "-Xms", &tail)) {
2094 julong size = 0;
2095 // an initial heap size of 0 means automatically determine
2096 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2097 if (errcode != arg_in_range) {
2098 jio_fprintf(defaultStream::error_stream(),
2099 "Invalid initial heap size: %s\n", option->optionString);
2100 describe_range_error(errcode);
2101 return JNI_EINVAL;
2102 }
2103 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2104 return JNI_EINVAL;
2105 }
2106 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2107 return JNI_EINVAL;
2108 }
2109 // -Xmx
2110 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2111 julong long_max_heap_size = 0;
2112 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2113 if (errcode != arg_in_range) {
2114 jio_fprintf(defaultStream::error_stream(),
2115 "Invalid maximum heap size: %s\n", option->optionString);
2116 describe_range_error(errcode);
2117 return JNI_EINVAL;
2118 }
2119 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2120 return JNI_EINVAL;
2121 }
2122 // Xmaxf
2123 } else if (match_option(option, "-Xmaxf", &tail)) {
2124 char* err;
2125 double dmaxf = strtod(tail, &err);
2126 if (*err != '\0' || *tail == '\0') {
2127 jio_fprintf(defaultStream::error_stream(),
2128 "Bad max heap free ratio: %s\n",
2129 option->optionString);
2130 return JNI_EINVAL;
2131 }
2132 if (dmaxf < 0.0 || dmaxf > 1.0) {
2133 jio_fprintf(defaultStream::error_stream(),
2134 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2135 option->optionString);
2136 return JNI_EINVAL;
2137 }
2138 const uintx umaxf = (uintx)(dmaxf * 100);
2139 if (MinHeapFreeRatio > umaxf) {
2140 jio_fprintf(defaultStream::error_stream(),
2141 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2142 tail, MinHeapFreeRatio / 100.0f);
2143 return JNI_EINVAL;
2144 }
2145 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2146 return JNI_EINVAL;
2147 }
2148 // Xminf
2149 } else if (match_option(option, "-Xminf", &tail)) {
2150 char* err;
2151 double dminf = strtod(tail, &err);
2152 if (*err != '\0' || *tail == '\0') {
2153 jio_fprintf(defaultStream::error_stream(),
2154 "Bad min heap free ratio: %s\n",
2155 option->optionString);
2156 return JNI_EINVAL;
2157 }
2158 if (dminf < 0.0 || dminf > 1.0) {
2159 jio_fprintf(defaultStream::error_stream(),
2160 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2161 tail);
2162 return JNI_EINVAL;
2163 }
2164 const uintx uminf = (uintx)(dminf * 100);
2165 if (MaxHeapFreeRatio < uminf) {
2166 jio_fprintf(defaultStream::error_stream(),
2167 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2168 tail, MaxHeapFreeRatio / 100.0f);
2169 return JNI_EINVAL;
2170 }
2171 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2172 return JNI_EINVAL;
2173 }
2174 // -Xss
2175 } else if (match_option(option, "-Xss", &tail)) {
2176 intx value = 0;
2177 jint err = parse_xss(option, tail, &value);
2178 if (err != JNI_OK) {
2179 return err;
2180 }
2181 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2182 return JNI_EINVAL;
2183 }
2184 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2185 warning("Ignoring option %s; support was removed in JDK 27", option->optionString);
2186 } else if (match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2187 julong long_ReservedCodeCacheSize = 0;
2188
2189 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2190 if (errcode != arg_in_range) {
2191 jio_fprintf(defaultStream::error_stream(),
2192 "Invalid maximum code cache size: %s.\n", option->optionString);
2193 return JNI_EINVAL;
2194 }
2195 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2196 return JNI_EINVAL;
2197 }
2198 // -green
2199 } else if (match_option(option, "-green")) {
2200 jio_fprintf(defaultStream::error_stream(),
2201 "Green threads support not available\n");
2202 return JNI_EINVAL;
2203 // -native
2204 } else if (match_option(option, "-native")) {
2205 // HotSpot always uses native threads, ignore silently for compatibility
2206 // -Xrs
2207 } else if (match_option(option, "-Xrs")) {
2208 // Classic/EVM option, new functionality
2209 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2210 return JNI_EINVAL;
2211 }
2212 // -Xprof
2213 } else if (match_option(option, "-Xprof")) {
2214 char version[256];
2215 // Obsolete in JDK 10
2216 JDK_Version::jdk(10).to_string(version, sizeof(version));
2217 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2218 // -Xinternalversion
2219 } else if (match_option(option, "-Xinternalversion")) {
2220 jio_fprintf(defaultStream::output_stream(), "%s\n",
2221 VM_Version::internal_vm_info_string());
2222 vm_exit(0);
2223 #ifndef PRODUCT
2224 // -Xprintflags
2225 } else if (match_option(option, "-Xprintflags")) {
2226 JVMFlag::printFlags(tty, false);
2227 vm_exit(0);
2228 #endif
2229 // -D
2230 } else if (match_option(option, "-D", &tail)) {
2231 const char* value;
2232 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2233 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2234 // abort if -Djava.endorsed.dirs is set
2235 jio_fprintf(defaultStream::output_stream(),
2236 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2237 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2238 return JNI_EINVAL;
2239 }
2240 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2241 *value != '\0' && strcmp(value, "\"\"") != 0) {
2242 // abort if -Djava.ext.dirs is set
2243 jio_fprintf(defaultStream::output_stream(),
2244 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2245 return JNI_EINVAL;
2246 }
2247 // Check for module related properties. They must be set using the modules
2248 // options. For example: use "--add-modules=java.sql", not
2249 // "-Djdk.module.addmods=java.sql"
2250 if (is_internal_module_property(option->optionString + 2)) {
2251 needs_module_property_warning = true;
2252 continue;
2253 }
2254 if (!add_property(tail)) {
2255 return JNI_ENOMEM;
2256 }
2257 // Out of the box management support
2258 if (match_option(option, "-Dcom.sun.management", &tail)) {
2259 #if INCLUDE_MANAGEMENT
2260 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2261 return JNI_EINVAL;
2262 }
2263 // management agent in module jdk.management.agent
2264 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2265 return JNI_ENOMEM;
2266 }
2267 #else
2268 jio_fprintf(defaultStream::output_stream(),
2269 "-Dcom.sun.management is not supported in this VM.\n");
2270 return JNI_ERR;
2271 #endif
2272 }
2273 // -Xint
2274 } else if (match_option(option, "-Xint")) {
2275 set_mode_flags(_int);
2276 mode_flag_cmd_line = true;
2277 // -Xmixed
2278 } else if (match_option(option, "-Xmixed")) {
2279 set_mode_flags(_mixed);
2280 mode_flag_cmd_line = true;
2281 // -Xcomp
2282 } else if (match_option(option, "-Xcomp")) {
2283 // for testing the compiler; turn off all flags that inhibit compilation
2284 set_mode_flags(_comp);
2285 mode_flag_cmd_line = true;
2286 // -Xshare:dump
2287 } else if (match_option(option, "-Xshare:dump")) {
2288 CDSConfig::enable_dumping_static_archive();
2289 CDSConfig::set_old_cds_flags_used();
2290 // -Xshare:on
2291 } else if (match_option(option, "-Xshare:on")) {
2292 UseSharedSpaces = true;
2293 RequireSharedSpaces = true;
2294 CDSConfig::set_old_cds_flags_used();
2295 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2296 } else if (match_option(option, "-Xshare:auto")) {
2297 UseSharedSpaces = true;
2298 RequireSharedSpaces = false;
2299 xshare_auto_cmd_line = true;
2300 CDSConfig::set_old_cds_flags_used();
2301 // -Xshare:off
2302 } else if (match_option(option, "-Xshare:off")) {
2303 UseSharedSpaces = false;
2304 RequireSharedSpaces = false;
2305 CDSConfig::set_old_cds_flags_used();
2306 // -Xverify
2307 } else if (match_option(option, "-Xverify", &tail)) {
2308 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2309 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2310 return JNI_EINVAL;
2311 }
2312 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2313 return JNI_EINVAL;
2314 }
2315 } else if (strcmp(tail, ":remote") == 0) {
2316 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2317 return JNI_EINVAL;
2318 }
2319 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2320 return JNI_EINVAL;
2321 }
2322 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2323 return JNI_EINVAL;
2324 }
2325 // -Xdebug
2326 } else if (match_option(option, "-Xdebug")) {
2327 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2328 } else if (match_option(option, "-Xloggc:", &tail)) {
2329 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2330 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2331 _legacyGCLogging.lastFlag = 2;
2332 _legacyGCLogging.file = os::strdup_check_oom(tail);
2333 } else if (match_option(option, "-Xlog", &tail)) {
2334 bool ret = false;
2335 if (strcmp(tail, ":help") == 0) {
2336 fileStream stream(defaultStream::output_stream());
2337 LogConfiguration::print_command_line_help(&stream);
2338 vm_exit(0);
2339 } else if (strcmp(tail, ":disable") == 0) {
2340 LogConfiguration::disable_logging();
2341 ret = true;
2342 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2343 const char* async_tail = tail + strlen(":async");
2344 ret = LogConfiguration::parse_async_argument(async_tail);
2345 } else if (*tail == '\0') {
2346 ret = LogConfiguration::parse_command_line_arguments();
2347 assert(ret, "-Xlog without arguments should never fail to parse");
2348 } else if (*tail == ':') {
2349 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2350 }
2351 if (ret == false) {
2352 jio_fprintf(defaultStream::error_stream(),
2353 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2354 tail);
2355 return JNI_EINVAL;
2356 }
2357 // JNI hooks
2358 } else if (match_option(option, "-Xcheck", &tail)) {
2359 if (!strcmp(tail, ":jni")) {
2360 #if !INCLUDE_JNI_CHECK
2361 warning("JNI CHECKING is not supported in this VM");
2362 #else
2363 CheckJNICalls = true;
2364 #endif // INCLUDE_JNI_CHECK
2365 } else if (is_bad_option(option, args->ignoreUnrecognized,
2366 "check")) {
2367 return JNI_EINVAL;
2368 }
2369 } else if (match_option(option, "vfprintf")) {
2370 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2371 } else if (match_option(option, "exit")) {
2372 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2373 } else if (match_option(option, "abort")) {
2374 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2375 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2376 // and the last option wins.
2377 } else if (match_option(option, "-XX:+NeverTenure")) {
2378 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2379 return JNI_EINVAL;
2380 }
2381 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2382 return JNI_EINVAL;
2383 }
2384 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2385 return JNI_EINVAL;
2386 }
2387 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2388 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2389 return JNI_EINVAL;
2390 }
2391 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2392 return JNI_EINVAL;
2393 }
2394 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2395 return JNI_EINVAL;
2396 }
2397 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2398 uint max_tenuring_thresh = 0;
2399 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2400 jio_fprintf(defaultStream::error_stream(),
2401 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2402 return JNI_EINVAL;
2403 }
2404
2405 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2406 return JNI_EINVAL;
2407 }
2408
2409 if (MaxTenuringThreshold == 0) {
2410 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2411 return JNI_EINVAL;
2412 }
2413 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2414 return JNI_EINVAL;
2415 }
2416 } else {
2417 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2418 return JNI_EINVAL;
2419 }
2420 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 }
2424 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2425 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2426 return JNI_EINVAL;
2427 }
2428 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2429 return JNI_EINVAL;
2430 }
2431 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2432 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2433 return JNI_EINVAL;
2434 }
2435 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2436 return JNI_EINVAL;
2437 }
2438 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2439 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2440 return JNI_EINVAL;
2441 }
2442 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2443 return JNI_EINVAL;
2444 }
2445 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2446 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2447 return JNI_EINVAL;
2448 }
2449 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2450 return JNI_EINVAL;
2451 }
2452 } else if (match_option(option, "--finalization=", &tail)) {
2453 if (strcmp(tail, "enabled") == 0) {
2454 InstanceKlass::set_finalization_enabled(true);
2455 } else if (strcmp(tail, "disabled") == 0) {
2456 InstanceKlass::set_finalization_enabled(false);
2457 } else {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2460 tail);
2461 return JNI_EINVAL;
2462 }
2463 #if !defined(DTRACE_ENABLED)
2464 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2465 jio_fprintf(defaultStream::error_stream(),
2466 "DTraceMethodProbes flag is not applicable for this configuration\n");
2467 return JNI_EINVAL;
2468 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2469 jio_fprintf(defaultStream::error_stream(),
2470 "DTraceAllocProbes flag is not applicable for this configuration\n");
2471 return JNI_EINVAL;
2472 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2475 return JNI_EINVAL;
2476 #endif // !defined(DTRACE_ENABLED)
2477 #ifdef ASSERT
2478 } else if (match_option(option, "-XX:+FullGCALot")) {
2479 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2480 return JNI_EINVAL;
2481 }
2482 #endif
2483 #if !INCLUDE_MANAGEMENT
2484 } else if (match_option(option, "-XX:+ManagementServer")) {
2485 jio_fprintf(defaultStream::error_stream(),
2486 "ManagementServer is not supported in this VM.\n");
2487 return JNI_ERR;
2488 #endif // INCLUDE_MANAGEMENT
2489 #if INCLUDE_JFR
2490 } else if (match_jfr_option(&option)) {
2491 return JNI_EINVAL;
2492 #endif
2493 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2494 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2495 // already been handled
2496 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2497 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2498 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2499 return JNI_EINVAL;
2500 }
2501 }
2502 // Unknown option
2503 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2504 return JNI_ERR;
2505 }
2506 }
2507
2508 // PrintSharedArchiveAndExit will turn on
2509 // -Xshare:on
2510 // -Xlog:class+path=info
2511 if (PrintSharedArchiveAndExit) {
2512 UseSharedSpaces = true;
2513 RequireSharedSpaces = true;
2514 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2515 }
2516
2517 fix_appclasspath();
2518
2519 return JNI_OK;
2520 }
2521
2522 void Arguments::set_ext_dirs(char *value) {
2523 _ext_dirs = os::strdup_check_oom(value);
2524 }
2525
2526 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2527 // For java.base check for duplicate --patch-module options being specified on the command line.
2528 // This check is only required for java.base, all other duplicate module specifications
2529 // will be checked during module system initialization. The module system initialization
2530 // will throw an ExceptionInInitializerError if this situation occurs.
2531 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2532 if (patch_mod_javabase) {
2533 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2534 } else {
2535 patch_mod_javabase = true;
2536 }
2537 }
2538
2539 // Create GrowableArray lazily, only if --patch-module has been specified
2540 if (_patch_mod_prefix == nullptr) {
2541 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2542 }
2543
2544 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2545 }
2546
2547 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2548 //
2549 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2550 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2551 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2552 // path is treated as the current directory.
2553 //
2554 // This causes problems with CDS, which requires that all directories specified in the classpath
2555 // must be empty. In most cases, applications do NOT want to load classes from the current
2556 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2557 // scripts compatible with CDS.
2558 void Arguments::fix_appclasspath() {
2559 if (IgnoreEmptyClassPaths) {
2560 const char separator = *os::path_separator();
2561 const char* src = _java_class_path->value();
2562
2563 // skip over all the leading empty paths
2564 while (*src == separator) {
2565 src ++;
2566 }
2567
2568 char* copy = os::strdup_check_oom(src, mtArguments);
2569
2570 // trim all trailing empty paths
2571 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2572 *tail = '\0';
2573 }
2574
2575 char from[3] = {separator, separator, '\0'};
2576 char to [2] = {separator, '\0'};
2577 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2578 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2579 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2580 }
2581
2582 _java_class_path->set_writeable_value(copy);
2583 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2584 }
2585 }
2586
2587 jint Arguments::finalize_vm_init_args() {
2588 // check if the default lib/endorsed directory exists; if so, error
2589 char path[JVM_MAXPATHLEN];
2590 const char* fileSep = os::file_separator();
2591 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2592
2593 DIR* dir = os::opendir(path);
2594 if (dir != nullptr) {
2595 jio_fprintf(defaultStream::output_stream(),
2596 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2597 "in modular form will be supported via the concept of upgradeable modules.\n");
2598 os::closedir(dir);
2599 return JNI_ERR;
2600 }
2601
2602 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2603 dir = os::opendir(path);
2604 if (dir != nullptr) {
2605 jio_fprintf(defaultStream::output_stream(),
2606 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2607 "Use -classpath instead.\n.");
2608 os::closedir(dir);
2609 return JNI_ERR;
2610 }
2611
2612 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2613 // but like -Xint, leave compilation thresholds unaffected.
2614 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2615 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2616 set_mode_flags(_int);
2617 }
2618
2619 #ifdef ZERO
2620 // Zero always runs in interpreted mode
2621 set_mode_flags(_int);
2622 #endif
2623
2624 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2625 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2626 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2627 }
2628
2629 #ifndef COMPILER2
2630 // Don't degrade server performance for footprint
2631 if (FLAG_IS_DEFAULT(UseLargePages) &&
2632 MaxHeapSize < LargePageHeapSizeThreshold) {
2633 // No need for large granularity pages w/small heaps.
2634 // Note that large pages are enabled/disabled for both the
2635 // Java heap and the code cache.
2636 FLAG_SET_DEFAULT(UseLargePages, false);
2637 }
2638
2639 UNSUPPORTED_OPTION(ProfileInterpreter);
2640 #endif // !COMPILER2
2641
2642 // Parse the CompilationMode flag
2643 if (!CompilationModeFlag::initialize()) {
2644 return JNI_ERR;
2645 }
2646
2647 // Called after ClassLoader::lookup_vm_options() but before class loading begins.
2648 ClassLoader::set_preview_mode(is_valhalla_enabled());
2649
2650 if (!check_vm_args_consistency()) {
2651 return JNI_ERR;
2652 }
2653
2654
2655 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2656 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2657 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2658
2659 return JNI_OK;
2660 }
2661
2662 // Helper class for controlling the lifetime of JavaVMInitArgs
2663 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2664 // deleted on the destruction of the ScopedVMInitArgs object.
2665 class ScopedVMInitArgs : public StackObj {
2666 private:
2667 JavaVMInitArgs _args;
2668 char* _container_name;
2669 bool _is_set;
2670 char* _vm_options_file_arg;
2671
2672 public:
2673 ScopedVMInitArgs(const char *container_name) {
2674 _args.version = JNI_VERSION_1_2;
2675 _args.nOptions = 0;
2676 _args.options = nullptr;
2677 _args.ignoreUnrecognized = false;
2678 _container_name = (char *)container_name;
2679 _is_set = false;
2680 _vm_options_file_arg = nullptr;
2681 }
2682
2683 // Populates the JavaVMInitArgs object represented by this
2684 // ScopedVMInitArgs object with the arguments in options. The
2685 // allocated memory is deleted by the destructor. If this method
2686 // returns anything other than JNI_OK, then this object is in a
2687 // partially constructed state, and should be abandoned.
2688 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2689 _is_set = true;
2690 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2691 JavaVMOption, options->length(), mtArguments);
2692 if (options_arr == nullptr) {
2693 return JNI_ENOMEM;
2694 }
2695 _args.options = options_arr;
2696
2697 for (int i = 0; i < options->length(); i++) {
2698 options_arr[i] = options->at(i);
2699 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2700 if (options_arr[i].optionString == nullptr) {
2701 // Rely on the destructor to do cleanup.
2702 _args.nOptions = i;
2703 return JNI_ENOMEM;
2704 }
2705 }
2706
2707 _args.nOptions = options->length();
2708 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2709 return JNI_OK;
2710 }
2711
2712 JavaVMInitArgs* get() { return &_args; }
2713 char* container_name() { return _container_name; }
2714 bool is_set() { return _is_set; }
2715 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
2716 char* vm_options_file_arg() { return _vm_options_file_arg; }
2717
2718 void set_vm_options_file_arg(const char *vm_options_file_arg) {
2719 if (_vm_options_file_arg != nullptr) {
2720 os::free(_vm_options_file_arg);
2721 }
2722 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
2723 }
2724
2725 ~ScopedVMInitArgs() {
2726 if (_vm_options_file_arg != nullptr) {
2727 os::free(_vm_options_file_arg);
2728 }
2729 if (_args.options == nullptr) return;
2730 for (int i = 0; i < _args.nOptions; i++) {
2731 os::free(_args.options[i].optionString);
2732 }
2733 FREE_C_HEAP_ARRAY(_args.options);
2734 }
2735
2736 // Insert options into this option list, to replace option at
2737 // vm_options_file_pos (-XX:VMOptionsFile)
2738 jint insert(const JavaVMInitArgs* args,
2739 const JavaVMInitArgs* args_to_insert,
2740 const int vm_options_file_pos) {
2741 assert(_args.options == nullptr, "shouldn't be set yet");
2742 assert(args_to_insert->nOptions != 0, "there should be args to insert");
2743 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
2744
2745 int length = args->nOptions + args_to_insert->nOptions - 1;
2746 // Construct new option array
2747 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
2748 for (int i = 0; i < args->nOptions; i++) {
2749 if (i == vm_options_file_pos) {
2750 // insert the new options starting at the same place as the
2751 // -XX:VMOptionsFile option
2752 for (int j = 0; j < args_to_insert->nOptions; j++) {
2753 options.push(args_to_insert->options[j]);
2754 }
2755 } else {
2756 options.push(args->options[i]);
2757 }
2758 }
2759 // make into options array
2760 return set_args(&options);
2761 }
2762 };
2763
2764 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
2765 return parse_options_environment_variable("_JAVA_OPTIONS", args);
2766 }
2767
2768 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
2769 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
2770 }
2771
2772 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
2773 for (int index = args->nOptions - 1; index >= 0; index--) {
2774 JavaVMOption* option = args->options + index;
2775 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
2776 return option;
2777 }
2778 }
2779
2780 return nullptr;
2781 }
2782
2783 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
2784 ScopedVMInitArgs* jdk_aot_vm_options_args) {
2785 // Don't bother scanning all the args if this env variable is not set
2786 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
2787 return JNI_OK;
2788 }
2789
2790 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
2791 // of AOTMode.
2792 JavaVMOption* option = nullptr;
2793 for (int i = all_args->length() - 1; i >= 0; i--) {
2794 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
2795 break;
2796 }
2797 }
2798
2799 if (option != nullptr) {
2800 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
2801 // so its value is not reflected inside the global variable AOTMode.
2802 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
2803 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2804 }
2805 } else {
2806 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
2807 // which would have been set inside process_settings_file();
2808 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
2809 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2810 }
2811 }
2812
2813 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
2814 }
2815
2816 jint Arguments::parse_options_environment_variable(const char* name,
2817 ScopedVMInitArgs* vm_args) {
2818 char *buffer = ::getenv(name);
2819
2820 // Don't check this environment variable if user has special privileges
2821 // (e.g. unix su command).
2822 if (buffer == nullptr || os::have_special_privileges()) {
2823 return JNI_OK;
2824 }
2825
2826 if ((buffer = os::strdup(buffer)) == nullptr) {
2827 return JNI_ENOMEM;
2828 }
2829
2830 jio_fprintf(defaultStream::error_stream(),
2831 "Picked up %s: %s\n", name, buffer);
2832
2833 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
2834
2835 os::free(buffer);
2836 return retcode;
2837 }
2838
2839 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
2840 // read file into buffer
2841 int fd = ::open(file_name, O_RDONLY);
2842 if (fd < 0) {
2843 jio_fprintf(defaultStream::error_stream(),
2844 "Could not open options file '%s'\n",
2845 file_name);
2846 return JNI_ERR;
2847 }
2848
2849 struct stat stbuf;
2850 int retcode = os::stat(file_name, &stbuf);
2851 if (retcode != 0) {
2852 jio_fprintf(defaultStream::error_stream(),
2853 "Could not stat options file '%s'\n",
2854 file_name);
2855 ::close(fd);
2856 return JNI_ERR;
2857 }
2858
2859 if (stbuf.st_size == 0) {
2860 // tell caller there is no option data and that is ok
2861 ::close(fd);
2862 return JNI_OK;
2863 }
2864
2865 // '+ 1' for null termination even with max bytes
2866 size_t bytes_alloc = stbuf.st_size + 1;
2867
2868 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
2869 if (nullptr == buf) {
2870 jio_fprintf(defaultStream::error_stream(),
2871 "Could not allocate read buffer for options file parse\n");
2872 ::close(fd);
2873 return JNI_ENOMEM;
2874 }
2875
2876 memset(buf, 0, bytes_alloc);
2877
2878 // Fill buffer
2879 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
2880 ::close(fd);
2881 if (bytes_read < 0) {
2882 FREE_C_HEAP_ARRAY(buf);
2883 jio_fprintf(defaultStream::error_stream(),
2884 "Could not read options file '%s'\n", file_name);
2885 return JNI_ERR;
2886 }
2887
2888 if (bytes_read == 0) {
2889 // tell caller there is no option data and that is ok
2890 FREE_C_HEAP_ARRAY(buf);
2891 return JNI_OK;
2892 }
2893
2894 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
2895
2896 FREE_C_HEAP_ARRAY(buf);
2897 return retcode;
2898 }
2899
2900 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
2901 // Construct option array
2902 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
2903
2904 // some pointers to help with parsing
2905 char *buffer_end = buffer + buf_len;
2906 char *opt_hd = buffer;
2907 char *wrt = buffer;
2908 char *rd = buffer;
2909
2910 // parse all options
2911 while (rd < buffer_end) {
2912 // skip leading white space from the input string
2913 while (rd < buffer_end && isspace((unsigned char) *rd)) {
2914 rd++;
2915 }
2916
2917 if (rd >= buffer_end) {
2918 break;
2919 }
2920
2921 // Remember this is where we found the head of the token.
2922 opt_hd = wrt;
2923
2924 // Tokens are strings of non white space characters separated
2925 // by one or more white spaces.
2926 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
2927 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2928 int quote = *rd; // matching quote to look for
2929 rd++; // don't copy open quote
2930 while (rd < buffer_end && *rd != quote) {
2931 // include everything (even spaces)
2932 // up until the close quote
2933 *wrt++ = *rd++; // copy to option string
2934 }
2935
2936 if (rd < buffer_end) {
2937 rd++; // don't copy close quote
2938 } else {
2939 // did not see closing quote
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Unmatched quote in %s\n", name);
2942 return JNI_ERR;
2943 }
2944 } else {
2945 *wrt++ = *rd++; // copy to option string
2946 }
2947 }
2948
2949 // steal a white space character and set it to null
2950 *wrt++ = '\0';
2951 // We now have a complete token
2952
2953 JavaVMOption option;
2954 option.optionString = opt_hd;
2955 option.extraInfo = nullptr;
2956
2957 options.append(option); // Fill in option
2958
2959 rd++; // Advance to next character
2960 }
2961
2962 // Fill out JavaVMInitArgs structure.
2963 return vm_args->set_args(&options);
2964 }
2965
2966 #ifndef PRODUCT
2967 // Determine whether LogVMOutput should be implicitly turned on.
2968 static bool use_vm_log() {
2969 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
2970 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
2971 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
2972 PrintAssembly || TraceDeoptimization ||
2973 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
2974 return true;
2975 }
2976
2977 #ifdef COMPILER1
2978 if (PrintC1Statistics) {
2979 return true;
2980 }
2981 #endif // COMPILER1
2982
2983 #ifdef COMPILER2
2984 if (PrintOptoAssembly || PrintOptoStatistics) {
2985 return true;
2986 }
2987 #endif // COMPILER2
2988
2989 return false;
2990 }
2991
2992 #endif // PRODUCT
2993
2994 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
2995 for (int index = 0; index < args->nOptions; index++) {
2996 const JavaVMOption* option = args->options + index;
2997 const char* tail;
2998 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
2999 return true;
3000 }
3001 }
3002 return false;
3003 }
3004
3005 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3006 const char* vm_options_file,
3007 const int vm_options_file_pos,
3008 ScopedVMInitArgs* vm_options_file_args,
3009 ScopedVMInitArgs* args_out) {
3010 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3011 if (code != JNI_OK) {
3012 return code;
3013 }
3014
3015 if (vm_options_file_args->get()->nOptions < 1) {
3016 return JNI_OK;
3017 }
3018
3019 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3020 jio_fprintf(defaultStream::error_stream(),
3021 "A VM options file may not refer to a VM options file. "
3022 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3023 "options file '%s' in options container '%s' is an error.\n",
3024 vm_options_file_args->vm_options_file_arg(),
3025 vm_options_file_args->container_name());
3026 return JNI_EINVAL;
3027 }
3028
3029 return args_out->insert(args, vm_options_file_args->get(),
3030 vm_options_file_pos);
3031 }
3032
3033 // Expand -XX:VMOptionsFile found in args_in as needed.
3034 // mod_args and args_out parameters may return values as needed.
3035 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3036 ScopedVMInitArgs* mod_args,
3037 JavaVMInitArgs** args_out) {
3038 jint code = match_special_option_and_act(args_in, mod_args);
3039 if (code != JNI_OK) {
3040 return code;
3041 }
3042
3043 if (mod_args->is_set()) {
3044 // args_in contains -XX:VMOptionsFile and mod_args contains the
3045 // original options from args_in along with the options expanded
3046 // from the VMOptionsFile. Return a short-hand to the caller.
3047 *args_out = mod_args->get();
3048 } else {
3049 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3050 }
3051 return JNI_OK;
3052 }
3053
3054 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3055 ScopedVMInitArgs* args_out) {
3056 // Remaining part of option string
3057 const char* tail;
3058 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3059
3060 for (int index = 0; index < args->nOptions; index++) {
3061 const JavaVMOption* option = args->options + index;
3062 if (match_option(option, "-XX:Flags=", &tail)) {
3063 Arguments::set_jvm_flags_file(tail);
3064 continue;
3065 }
3066 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3067 if (vm_options_file_args.found_vm_options_file_arg()) {
3068 jio_fprintf(defaultStream::error_stream(),
3069 "The option '%s' is already specified in the options "
3070 "container '%s' so the specification of '%s' in the "
3071 "same options container is an error.\n",
3072 vm_options_file_args.vm_options_file_arg(),
3073 vm_options_file_args.container_name(),
3074 option->optionString);
3075 return JNI_EINVAL;
3076 }
3077 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3078 // If there's a VMOptionsFile, parse that
3079 jint code = insert_vm_options_file(args, tail, index,
3080 &vm_options_file_args, args_out);
3081 if (code != JNI_OK) {
3082 return code;
3083 }
3084 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3085 if (args_out->is_set()) {
3086 // The VMOptions file inserted some options so switch 'args'
3087 // to the new set of options, and continue processing which
3088 // preserves "last option wins" semantics.
3089 args = args_out->get();
3090 // The first option from the VMOptionsFile replaces the
3091 // current option. So we back track to process the
3092 // replacement option.
3093 index--;
3094 }
3095 continue;
3096 }
3097 if (match_option(option, "-XX:+PrintVMOptions")) {
3098 PrintVMOptions = true;
3099 continue;
3100 }
3101 if (match_option(option, "-XX:-PrintVMOptions")) {
3102 PrintVMOptions = false;
3103 continue;
3104 }
3105 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3106 IgnoreUnrecognizedVMOptions = true;
3107 continue;
3108 }
3109 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3110 IgnoreUnrecognizedVMOptions = false;
3111 continue;
3112 }
3113 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3114 JVMFlag::printFlags(tty, false);
3115 vm_exit(0);
3116 }
3117
3118 #ifndef PRODUCT
3119 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3120 JVMFlag::printFlags(tty, true);
3121 vm_exit(0);
3122 }
3123 #endif
3124 }
3125 return JNI_OK;
3126 }
3127
3128 static void print_options(const JavaVMInitArgs *args) {
3129 const char* tail;
3130 for (int index = 0; index < args->nOptions; index++) {
3131 const JavaVMOption *option = args->options + index;
3132 if (match_option(option, "-XX:", &tail)) {
3133 logOption(tail);
3134 }
3135 }
3136 }
3137
3138 bool Arguments::handle_deprecated_print_gc_flags() {
3139 if (PrintGC) {
3140 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3141 }
3142 if (PrintGCDetails) {
3143 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3144 }
3145
3146 if (_legacyGCLogging.lastFlag == 2) {
3147 // -Xloggc was used to specify a filename
3148 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3149
3150 LogTarget(Error, logging) target;
3151 LogStream errstream(target);
3152 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3153 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3154 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3155 }
3156 return true;
3157 }
3158
3159 static void apply_debugger_ergo() {
3160 #ifdef ASSERT
3161 if (ReplayCompiles) {
3162 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3163 }
3164
3165 if (UseDebuggerErgo) {
3166 // Turn on sub-flags
3167 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3168 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3169 }
3170
3171 if (UseDebuggerErgo2) {
3172 // Debugging with limited number of CPUs
3173 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3174 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3175 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3176 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3177 }
3178 #endif // ASSERT
3179 }
3180
3181 // Parse entry point called from JNI_CreateJavaVM
3182
3183 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3184 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3185 JVMFlag::check_all_flag_declarations();
3186
3187 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3188 const char* hotspotrc = ".hotspotrc";
3189 bool settings_file_specified = false;
3190 bool needs_hotspotrc_warning = false;
3191 ScopedVMInitArgs initial_vm_options_args("");
3192 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3193 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3194 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3195
3196 // Pointers to current working set of containers
3197 JavaVMInitArgs* cur_cmd_args;
3198 JavaVMInitArgs* cur_vm_options_args;
3199 JavaVMInitArgs* cur_java_options_args;
3200 JavaVMInitArgs* cur_java_tool_options_args;
3201 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3202
3203 // Containers for modified/expanded options
3204 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3205 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3206 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3207 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3208 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3209
3210 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3211
3212 jint code =
3213 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3214 if (code != JNI_OK) {
3215 return code;
3216 }
3217
3218 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3219 // This is an undocumented feature.
3220 code = parse_java_options_environment_variable(&initial_java_options_args);
3221 if (code != JNI_OK) {
3222 return code;
3223 }
3224
3225 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3226 char *vmoptions = ClassLoader::lookup_vm_options();
3227 if (vmoptions != nullptr) {
3228 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3229 FREE_C_HEAP_ARRAY(vmoptions);
3230 if (code != JNI_OK) {
3231 return code;
3232 }
3233 }
3234
3235 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3236 &mod_java_tool_options_args,
3237 &cur_java_tool_options_args);
3238 if (code != JNI_OK) {
3239 return code;
3240 }
3241
3242 code = expand_vm_options_as_needed(initial_cmd_args,
3243 &mod_cmd_args,
3244 &cur_cmd_args);
3245 if (code != JNI_OK) {
3246 return code;
3247 }
3248
3249 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3250 &mod_java_options_args,
3251 &cur_java_options_args);
3252 if (code != JNI_OK) {
3253 return code;
3254 }
3255
3256 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3257 &mod_vm_options_args,
3258 &cur_vm_options_args);
3259 if (code != JNI_OK) {
3260 return code;
3261 }
3262
3263 const char* flags_file = Arguments::get_jvm_flags_file();
3264 settings_file_specified = (flags_file != nullptr);
3265
3266 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3267 if (settings_file_specified) {
3268 if (!process_settings_file(flags_file, true,
3269 IgnoreUnrecognizedVMOptions)) {
3270 return JNI_EINVAL;
3271 }
3272 } else {
3273 #ifdef ASSERT
3274 // Parse default .hotspotrc settings file
3275 if (!process_settings_file(".hotspotrc", false,
3276 IgnoreUnrecognizedVMOptions)) {
3277 return JNI_EINVAL;
3278 }
3279 #else
3280 struct stat buf;
3281 if (os::stat(hotspotrc, &buf) == 0) {
3282 needs_hotspotrc_warning = true;
3283 }
3284 #endif
3285 }
3286
3287 // The settings in the args are applied in this order to the the JVM global flags.
3288 // For historical reasons, the order is DIFFERENT than the scanning order of
3289 // the above expand_vm_options_as_needed() calls.
3290 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3291 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3292 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3293 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3294
3295 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3296 // the options that have been gathered above.
3297 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3298 if (code != JNI_OK) {
3299 return code;
3300 }
3301 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3302 &mod_jdk_aot_vm_options_args,
3303 &cur_jdk_aot_vm_options_args);
3304 if (code != JNI_OK) {
3305 return code;
3306 }
3307
3308 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3309 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3310 const char* optionString = option->optionString;
3311 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3312 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3313 jio_fprintf(defaultStream::error_stream(),
3314 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3315 return JNI_ERR;
3316 }
3317 }
3318
3319 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3320
3321 if (IgnoreUnrecognizedVMOptions) {
3322 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3323 // the JDK so it shouldn't have bad options.
3324 cur_cmd_args->ignoreUnrecognized = true;
3325 cur_java_tool_options_args->ignoreUnrecognized = true;
3326 cur_java_options_args->ignoreUnrecognized = true;
3327 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3328 }
3329
3330 if (PrintVMOptions) {
3331 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3332 print_options(cur_java_tool_options_args);
3333 print_options(cur_cmd_args);
3334 print_options(cur_java_options_args);
3335 print_options(cur_jdk_aot_vm_options_args);
3336 }
3337
3338 // Apply the settings in these args to the JVM global flags.
3339 jint result = parse_vm_init_args(&all_args);
3340
3341 if (result != JNI_OK) {
3342 return result;
3343 }
3344
3345 // Delay warning until here so that we've had a chance to process
3346 // the -XX:-PrintWarnings flag
3347 if (needs_hotspotrc_warning) {
3348 warning("%s file is present but has been ignored. "
3349 "Run with -XX:Flags=%s to load the file.",
3350 hotspotrc, hotspotrc);
3351 }
3352
3353 if (needs_module_property_warning) {
3354 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3355 " names that are reserved for internal use.");
3356 }
3357
3358 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3359 UNSUPPORTED_OPTION(UseLargePages);
3360 #endif
3361
3362 #if defined(AIX)
3363 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3364 #endif
3365
3366 #ifndef PRODUCT
3367 if (TraceBytecodesAt != 0) {
3368 TraceBytecodes = true;
3369 }
3370 #endif // PRODUCT
3371
3372 if (ScavengeRootsInCode == 0) {
3373 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3374 warning("Forcing ScavengeRootsInCode non-zero");
3375 }
3376 ScavengeRootsInCode = 1;
3377 }
3378
3379 if (!handle_deprecated_print_gc_flags()) {
3380 return JNI_EINVAL;
3381 }
3382
3383 // Set object alignment values.
3384 set_object_alignment();
3385
3386 #if !INCLUDE_CDS
3387 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3388 jio_fprintf(defaultStream::error_stream(),
3389 "Shared spaces are not supported in this VM\n");
3390 return JNI_ERR;
3391 }
3392 if (DumpLoadedClassList != nullptr) {
3393 jio_fprintf(defaultStream::error_stream(),
3394 "DumpLoadedClassList is not supported in this VM\n");
3395 return JNI_ERR;
3396 }
3397 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3398 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3399 warning("Shared spaces are not supported in this VM");
3400 UseSharedSpaces = false;
3401 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3402 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3403 }
3404 no_shared_spaces("CDS Disabled");
3405 #endif // INCLUDE_CDS
3406
3407 // Verify NMT arguments
3408 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3409 if (lvl == NMT_unknown) {
3410 jio_fprintf(defaultStream::error_stream(),
3411 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3412 return JNI_ERR;
3413 }
3414 if (PrintNMTStatistics && lvl == NMT_off) {
3415 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3416 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3417 }
3418
3419 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3420 if (trace_dependencies && VerifyDependencies) {
3421 warning("dependency logging results may be inflated by VerifyDependencies");
3422 }
3423
3424 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3425 log_is_enabled(Info, class, load, cause);
3426 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3427 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3428 }
3429
3430 apply_debugger_ergo();
3431
3432 // The VMThread needs to stop now and then to execute these debug options.
3433 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3434 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3435 }
3436
3437 if (log_is_enabled(Info, arguments)) {
3438 LogStream st(Log(arguments)::info());
3439 Arguments::print_on(&st);
3440 }
3441
3442 return JNI_OK;
3443 }
3444
3445 void Arguments::set_compact_headers_flags() {
3446 #ifdef _LP64
3447 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3448 if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3449 warning("-UseObjectMonitorTable is incompatible with +UseCompactObjectHeaders; ignoring -UseObjectMonitorTable");
3450 }
3451 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3452 }
3453 #endif
3454 }
3455
3456 jint Arguments::apply_ergo() {
3457 // Set flags based on ergonomics.
3458 jint result = set_ergonomics_flags();
3459 if (result != JNI_OK) return result;
3460
3461 // Set heap size based on available physical memory
3462 GCConfig::arguments()->set_heap_size();
3463
3464 GCConfig::arguments()->initialize();
3465
3466 set_compact_headers_flags();
3467
3468 CompressedKlassPointers::pre_initialize();
3469
3470 CDSConfig::ergo_initialize();
3471
3472 // Initialize Metaspace flags and alignments
3473 Metaspace::ergo_initialize();
3474
3475 if (!StringDedup::ergo_initialize()) {
3476 return JNI_EINVAL;
3477 }
3478
3479 // Set compiler flags after GC is selected and GC specific
3480 // flags (LoopStripMiningIter) are set.
3481 CompilerConfig::ergo_initialize();
3482
3483 // Set bytecode rewriting flags
3484 set_bytecode_flags();
3485
3486 // Set flags if aggressive optimization flags are enabled
3487 jint code = set_aggressive_opts_flags();
3488 if (code != JNI_OK) {
3489 return code;
3490 }
3491
3492 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3493 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3494 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3495 warning("UseSecondarySupersTable is not supported");
3496 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3497 }
3498 if (!UseSecondarySupersTable) {
3499 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3500 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3501 }
3502
3503 #ifdef ZERO
3504 // Clear flags not supported on zero.
3505 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3506 #endif // ZERO
3507
3508 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3509 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3510 DebugNonSafepoints = true;
3511 }
3512
3513 // Treat the odd case where local verification is enabled but remote
3514 // verification is not as if both were enabled.
3515 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3516 log_info(verification)("Turning on remote verification because local verification is on");
3517 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3518 }
3519 if (!is_valhalla_enabled()) {
3520 #define WARN_IF_NOT_DEFAULT_FLAG(flag) \
3521 if (!FLAG_IS_DEFAULT(flag)) { \
3522 warning("Preview-specific flag \"%s\" has no effect when --enable-preview is not specified.", #flag); \
3523 }
3524
3525 #define DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(flag) \
3526 WARN_IF_NOT_DEFAULT_FLAG(flag) \
3527 FLAG_SET_DEFAULT(flag, false);
3528
3529 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypePassFieldsAsArgs);
3530 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypeReturnedAsFields);
3531 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayFlattening);
3532 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseFieldFlattening);
3533 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullFreeNonAtomicValueFlattening);
3534 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullableAtomicValueFlattening);
3535 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullFreeAtomicValueFlattening);
3536 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullableNonAtomicValueFlattening);
3537 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseAcmpFastPath);
3538 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintInlineLayout);
3539 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintFlatArrayLayout);
3540 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(IgnoreAssertUnsetFields);
3541 WARN_IF_NOT_DEFAULT_FLAG(FlatArrayElementMaxOops);
3542 WARN_IF_NOT_DEFAULT_FLAG(ForceNonTearable);
3543 #ifdef ASSERT
3544 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(StressCallingConvention);
3545 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PreloadClasses);
3546 WARN_IF_NOT_DEFAULT_FLAG(PrintInlineKlassFields);
3547 #endif
3548 #ifdef COMPILER1
3549 DEBUG_ONLY(DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(C1UseDelayedFlattenedFieldReads);)
3550 #endif
3551 #ifdef COMPILER2
3552 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayLoadStoreProfile);
3553 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseACmpProfile);
3554 #endif
3555 #undef DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT
3556 #undef WARN_IF_NOT_DEFAULT_FLAG
3557 } else {
3558 #define DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(flag, fallback) \
3559 if (!FLAG_IS_DEFAULT(flag) && !UseArrayFlattening && !UseFieldFlattening) { \
3560 warning("Flattening flag \"%s\" has no effect when all flattening modes are disabled.", #flag); \
3561 FLAG_SET_DEFAULT(flag, fallback); \
3562 }
3563
3564 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullFreeNonAtomicValueFlattening, false);
3565 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullableAtomicValueFlattening, false);
3566 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullFreeAtomicValueFlattening, false);
3567 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullableNonAtomicValueFlattening, false);
3568 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(FlatArrayElementMaxOops, 0);
3569 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(FlatteningBudget, 0);
3570 #undef DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING
3571 if (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces) {
3572 // Disable calling convention optimizations if inline types are not supported.
3573 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3574 // the CDS archive, as the values must match between dumptime and runtime.
3575 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3576 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3577 }
3578 if (!UseNullFreeNonAtomicValueFlattening &&
3579 !UseNullableAtomicValueFlattening &&
3580 !UseNullFreeAtomicValueFlattening &&
3581 !UseNullableNonAtomicValueFlattening) {
3582 // Flattening is disabled
3583 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3584 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3585 }
3586 }
3587
3588 #ifndef PRODUCT
3589 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3590 if (use_vm_log()) {
3591 LogVMOutput = true;
3592 }
3593 }
3594 #endif // PRODUCT
3595
3596 if (PrintCommandLineFlags) {
3597 JVMFlag::printSetFlags(tty);
3598 }
3599
3600 #ifdef COMPILER2
3601 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3602 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3603 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3604 }
3605 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3606
3607 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3608 if (!EnableVectorReboxing) {
3609 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3610 } else {
3611 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3612 }
3613 }
3614 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3615 }
3616
3617 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3618 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3619 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3620 }
3621 #endif // COMPILER2
3622
3623 if (log_is_enabled(Info, perf, class, link)) {
3624 if (!UsePerfData) {
3625 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3626 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3627 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3628 }
3629 }
3630
3631 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3632 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3633 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3634 }
3635 }
3636 return JNI_OK;
3637 }
3638
3639 jint Arguments::adjust_after_os() {
3640 if (UseNUMA) {
3641 if (UseParallelGC) {
3642 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3643 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3644 }
3645 }
3646 }
3647 return JNI_OK;
3648 }
3649
3650 int Arguments::PropertyList_count(SystemProperty* pl) {
3651 int count = 0;
3652 while(pl != nullptr) {
3653 count++;
3654 pl = pl->next();
3655 }
3656 return count;
3657 }
3658
3659 // Return the number of readable properties.
3660 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3661 int count = 0;
3662 while(pl != nullptr) {
3663 if (pl->readable()) {
3664 count++;
3665 }
3666 pl = pl->next();
3667 }
3668 return count;
3669 }
3670
3671 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3672 assert(key != nullptr, "just checking");
3673 SystemProperty* prop;
3674 for (prop = pl; prop != nullptr; prop = prop->next()) {
3675 if (strcmp(key, prop->key()) == 0) return prop->value();
3676 }
3677 return nullptr;
3678 }
3679
3680 // Return the value of the requested property provided that it is a readable property.
3681 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3682 assert(key != nullptr, "just checking");
3683 SystemProperty* prop;
3684 // Return the property value if the keys match and the property is not internal or
3685 // it's the special internal property "jdk.boot.class.path.append".
3686 for (prop = pl; prop != nullptr; prop = prop->next()) {
3687 if (strcmp(key, prop->key()) == 0) {
3688 if (!prop->internal()) {
3689 return prop->value();
3690 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3691 return prop->value();
3692 } else {
3693 // Property is internal and not jdk.boot.class.path.append so return null.
3694 return nullptr;
3695 }
3696 }
3697 }
3698 return nullptr;
3699 }
3700
3701 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3702 SystemProperty* p = *plist;
3703 if (p == nullptr) {
3704 *plist = new_p;
3705 } else {
3706 while (p->next() != nullptr) {
3707 p = p->next();
3708 }
3709 p->set_next(new_p);
3710 }
3711 }
3712
3713 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3714 bool writeable, bool internal) {
3715 if (plist == nullptr)
3716 return;
3717
3718 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3719 PropertyList_add(plist, new_p);
3720 }
3721
3722 void Arguments::PropertyList_add(SystemProperty *element) {
3723 PropertyList_add(&_system_properties, element);
3724 }
3725
3726 // This add maintains unique property key in the list.
3727 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3728 PropertyAppendable append, PropertyWriteable writeable,
3729 PropertyInternal internal) {
3730 if (plist == nullptr)
3731 return;
3732
3733 // If property key exists and is writeable, then update with new value.
3734 // Trying to update a non-writeable property is silently ignored.
3735 SystemProperty* prop;
3736 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3737 if (strcmp(k, prop->key()) == 0) {
3738 if (append == AppendProperty) {
3739 prop->append_writeable_value(v);
3740 } else {
3741 prop->set_writeable_value(v);
3742 }
3743 return;
3744 }
3745 }
3746
3747 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3748 }
3749
3750 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3751 // Returns true if all of the source pointed by src has been copied over to
3752 // the destination buffer pointed by buf. Otherwise, returns false.
3753 // Notes:
3754 // 1. If the length (buflen) of the destination buffer excluding the
3755 // null terminator character is not long enough for holding the expanded
3756 // pid characters, it also returns false instead of returning the partially
3757 // expanded one.
3758 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3759 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3760 char* buf, size_t buflen) {
3761 const char* p = src;
3762 char* b = buf;
3763 const char* src_end = &src[srclen];
3764 char* buf_end = &buf[buflen - 1];
3765
3766 while (p < src_end && b < buf_end) {
3767 if (*p == '%') {
3768 switch (*(++p)) {
3769 case '%': // "%%" ==> "%"
3770 *b++ = *p++;
3771 break;
3772 case 'p': { // "%p" ==> current process id
3773 // buf_end points to the character before the last character so
3774 // that we could write '\0' to the end of the buffer.
3775 size_t buf_sz = buf_end - b + 1;
3776 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3777
3778 // if jio_snprintf fails or the buffer is not long enough to hold
3779 // the expanded pid, returns false.
3780 if (ret < 0 || ret >= (int)buf_sz) {
3781 return false;
3782 } else {
3783 b += ret;
3784 assert(*b == '\0', "fail in copy_expand_pid");
3785 if (p == src_end && b == buf_end + 1) {
3786 // reach the end of the buffer.
3787 return true;
3788 }
3789 }
3790 p++;
3791 break;
3792 }
3793 default :
3794 *b++ = '%';
3795 }
3796 } else {
3797 *b++ = *p++;
3798 }
3799 }
3800 *b = '\0';
3801 return (p == src_end); // return false if not all of the source was copied
3802 }