1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotLogging.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "gc/shared/gc_globals.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.hpp"
37 #include "gc/shared/genArguments.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_extension.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/os.hpp"
60 #include "runtime/safepoint.hpp"
61 #include "runtime/safepointMechanism.hpp"
62 #include "runtime/synchronizer.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "services/management.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/checkedCast.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 <limits>
79 #include <string.h>
80
81 static const char _default_java_launcher[] = "generic";
82
83 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
84
85 char* Arguments::_jvm_flags_file = nullptr;
86 char** Arguments::_jvm_flags_array = nullptr;
87 int Arguments::_num_jvm_flags = 0;
88 char** Arguments::_jvm_args_array = nullptr;
89 int Arguments::_num_jvm_args = 0;
90 unsigned int Arguments::_addmods_count = 0;
91 #if INCLUDE_JVMCI
92 bool Arguments::_jvmci_module_added = false;
93 #endif
94 char* Arguments::_java_command = nullptr;
95 SystemProperty* Arguments::_system_properties = nullptr;
96 size_t Arguments::_conservative_max_heap_alignment = 0;
97 Arguments::Mode Arguments::_mode = _mixed;
98 const char* Arguments::_java_vendor_url_bug = nullptr;
99 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
100 bool Arguments::_executing_unit_tests = false;
101
102 // These parameters are reset in method parse_vm_init_args()
103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
105 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
106 bool Arguments::_ClipInlining = ClipInlining;
107 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
108
109 bool Arguments::_enable_preview = false;
110 bool Arguments::_has_jdwp_agent = false;
111
112 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
113
114 // These are not set by the JDK's built-in launchers, but they can be set by
115 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
116 // JavaVMOption in jni.h.
117 abort_hook_t Arguments::_abort_hook = nullptr;
118 exit_hook_t Arguments::_exit_hook = nullptr;
119 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
120
121
122 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
123 SystemProperty *Arguments::_java_library_path = nullptr;
124 SystemProperty *Arguments::_java_home = nullptr;
125 SystemProperty *Arguments::_java_class_path = nullptr;
126 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
127 SystemProperty *Arguments::_vm_info = nullptr;
128
129 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
130 PathString *Arguments::_boot_class_path = nullptr;
131 bool Arguments::_has_jimage = false;
132
133 char* Arguments::_ext_dirs = nullptr;
134
135 // True if -Xshare:auto option was specified.
136 static bool xshare_auto_cmd_line = false;
137
138 // True if -Xint/-Xmixed/-Xcomp were specified
139 static bool mode_flag_cmd_line = false;
140
141 struct VMInitArgsGroup {
142 const JavaVMInitArgs* _args;
143 JVMFlagOrigin _origin;
144 };
145
146 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
147 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
148 if (new_value == nullptr) {
149 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
150 return false;
151 }
152 if (_value != nullptr) {
153 FreeHeap(_value);
154 }
155 _value = new_value;
156 strcpy(_value, value);
157 return true;
158 }
159
160 void PathString::append_value(const char *value) {
161 char *sp;
162 size_t len = 0;
163 if (value != nullptr) {
164 len = strlen(value);
165 if (_value != nullptr) {
166 len += strlen(_value);
167 }
168 sp = AllocateHeap(len+2, mtArguments);
169 assert(sp != nullptr, "Unable to allocate space for new append path value");
170 if (sp != nullptr) {
171 if (_value != nullptr) {
172 strcpy(sp, _value);
173 strcat(sp, os::path_separator());
174 strcat(sp, value);
175 FreeHeap(_value);
176 } else {
177 strcpy(sp, value);
178 }
179 _value = sp;
180 }
181 }
182 }
183
184 PathString::PathString(const char* value) {
185 if (value == nullptr) {
186 _value = nullptr;
187 } else {
188 _value = AllocateHeap(strlen(value)+1, mtArguments);
189 strcpy(_value, value);
190 }
191 }
192
193 PathString::~PathString() {
194 if (_value != nullptr) {
195 FreeHeap(_value);
196 _value = nullptr;
197 }
198 }
199
200 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
201 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
202 size_t len = strlen(module_name) + 1;
203 _module_name = AllocateHeap(len, mtInternal);
204 strncpy(_module_name, module_name, len); // copy the trailing null
205 _path = new PathString(path);
206 }
207
208 ModulePatchPath::~ModulePatchPath() {
209 if (_module_name != nullptr) {
210 FreeHeap(_module_name);
211 _module_name = nullptr;
212 }
213 if (_path != nullptr) {
214 delete _path;
215 _path = nullptr;
216 }
217 }
218
219 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
220 if (key == nullptr) {
221 _key = nullptr;
222 } else {
223 _key = AllocateHeap(strlen(key)+1, mtArguments);
224 strcpy(_key, key);
225 }
226 _next = nullptr;
227 _internal = internal;
228 _writeable = writeable;
229 }
230
231 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
232 // part of the option string.
233 static bool match_option(const JavaVMOption *option, const char* name,
234 const char** tail) {
235 size_t len = strlen(name);
236 if (strncmp(option->optionString, name, len) == 0) {
237 *tail = option->optionString + len;
238 return true;
239 } else {
240 return false;
241 }
242 }
243
244 // Check if 'option' matches 'name'. No "tail" is allowed.
245 static bool match_option(const JavaVMOption *option, const char* name) {
246 const char* tail = nullptr;
247 bool result = match_option(option, name, &tail);
248 if (tail != nullptr && *tail == '\0') {
249 return result;
250 } else {
251 return false;
252 }
253 }
254
255 // Return true if any of the strings in null-terminated array 'names' matches.
256 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
257 // the option must match exactly.
258 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
259 bool tail_allowed) {
260 for (/* empty */; *names != nullptr; ++names) {
261 if (match_option(option, *names, tail)) {
262 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
263 return true;
264 }
265 }
266 }
267 return false;
268 }
269
270 #if INCLUDE_JFR
271 static bool _has_jfr_option = false; // is using JFR
272
273 // return true on failure
274 static bool match_jfr_option(const JavaVMOption** option) {
275 assert((*option)->optionString != nullptr, "invariant");
276 char* tail = nullptr;
277 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
278 _has_jfr_option = true;
279 return Jfr::on_start_flight_recording_option(option, tail);
280 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
281 _has_jfr_option = true;
282 return Jfr::on_flight_recorder_option(option, tail);
283 }
284 return false;
285 }
286
287 bool Arguments::has_jfr_option() {
288 return _has_jfr_option;
289 }
290 #endif
291
292 static void logOption(const char* opt) {
293 if (PrintVMOptions) {
294 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
295 }
296 }
297
298 bool needs_module_property_warning = false;
299
300 #define MODULE_PROPERTY_PREFIX "jdk.module."
301 #define MODULE_PROPERTY_PREFIX_LEN 11
302 #define ADDEXPORTS "addexports"
303 #define ADDEXPORTS_LEN 10
304 #define ADDREADS "addreads"
305 #define ADDREADS_LEN 8
306 #define ADDOPENS "addopens"
307 #define ADDOPENS_LEN 8
308 #define PATCH "patch"
309 #define PATCH_LEN 5
310 #define ADDMODS "addmods"
311 #define ADDMODS_LEN 7
312 #define LIMITMODS "limitmods"
313 #define LIMITMODS_LEN 9
314 #define PATH "path"
315 #define PATH_LEN 4
316 #define UPGRADE_PATH "upgrade.path"
317 #define UPGRADE_PATH_LEN 12
318 #define ENABLE_NATIVE_ACCESS "enable.native.access"
319 #define ENABLE_NATIVE_ACCESS_LEN 20
320 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
321 #define ILLEGAL_NATIVE_ACCESS_LEN 21
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 return true;
350 }
351
352 if (!check_for_cds) {
353 // CDS notes: these properties are supported by CDS archived full module graph.
354 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
355 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
356 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
357 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
358 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
359 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
360 return true;
361 }
362 }
363 }
364 return false;
365 }
366
367 bool Arguments::patching_migrated_classes(const char* property, const char* value) {
368 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
369 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
370 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN)) {
371 if (strcmp(value, "java.base-valueclasses.jar")) {
372 return true;
373 }
374 }
375 }
376 return false;
377 }
378
379 // Process java launcher properties.
380 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
381 // See if sun.java.launcher is defined.
382 // Must do this before setting up other system properties,
383 // as some of them may depend on launcher type.
384 for (int index = 0; index < args->nOptions; index++) {
385 const JavaVMOption* option = args->options + index;
386 const char* tail;
387
388 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
389 process_java_launcher_argument(tail, option->extraInfo);
390 continue;
391 }
392 if (match_option(option, "-XX:+ExecutingUnitTests")) {
393 _executing_unit_tests = true;
394 continue;
395 }
396 }
397 }
398
399 // Initialize system properties key and value.
400 void Arguments::init_system_properties() {
401
402 // Set up _boot_class_path which is not a property but
403 // relies heavily on argument processing and the jdk.boot.class.path.append
404 // property. It is used to store the underlying boot class path.
405 _boot_class_path = new PathString(nullptr);
406
407 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
408 "Java Virtual Machine Specification", false));
409 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
410 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
411 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
412
413 // Initialize the vm.info now, but it will need updating after argument parsing.
414 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
415
416 // Following are JVMTI agent writable properties.
417 // Properties values are set to nullptr and they are
418 // os specific they are initialized in os::init_system_properties_values().
419 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
420 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
421 _java_home = new SystemProperty("java.home", nullptr, true);
422 _java_class_path = new SystemProperty("java.class.path", "", true);
423 // jdk.boot.class.path.append is a non-writeable, internal property.
424 // It can only be set by either:
425 // - -Xbootclasspath/a:
426 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
427 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
428
429 // Add to System Property list.
430 PropertyList_add(&_system_properties, _sun_boot_library_path);
431 PropertyList_add(&_system_properties, _java_library_path);
432 PropertyList_add(&_system_properties, _java_home);
433 PropertyList_add(&_system_properties, _java_class_path);
434 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
435 PropertyList_add(&_system_properties, _vm_info);
436
437 // Set OS specific system properties values
438 os::init_system_properties_values();
439 }
440
441 // Update/Initialize System properties after JDK version number is known
442 void Arguments::init_version_specific_system_properties() {
443 enum { bufsz = 16 };
444 char buffer[bufsz];
445 const char* spec_vendor = "Oracle Corporation";
446 uint32_t spec_version = JDK_Version::current().major_version();
447
448 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
449
450 PropertyList_add(&_system_properties,
451 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
452 PropertyList_add(&_system_properties,
453 new SystemProperty("java.vm.specification.version", buffer, false));
454 PropertyList_add(&_system_properties,
455 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
456 }
457
458 /*
459 * -XX argument processing:
460 *
461 * -XX arguments are defined in several places, such as:
462 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
463 * -XX arguments are parsed in parse_argument().
464 * -XX argument bounds checking is done in check_vm_args_consistency().
465 *
466 * Over time -XX arguments may change. There are mechanisms to handle common cases:
467 *
468 * ALIASED: An option that is simply another name for another option. This is often
469 * part of the process of deprecating a flag, but not all aliases need
470 * to be deprecated.
471 *
472 * Create an alias for an option by adding the old and new option names to the
473 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
474 *
475 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
476 * support may be removed in the future. Both regular and aliased options may be
477 * deprecated.
478 *
479 * Add a deprecation warning for an option (or alias) by adding an entry in the
480 * "special_jvm_flags" table and setting the "deprecated_in" field.
481 * Often an option "deprecated" in one major release will
482 * be made "obsolete" in the next. In this case the entry should also have its
483 * "obsolete_in" field set.
484 *
485 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
486 * on the command line. A warning is printed to let the user know that option might not
487 * be accepted in the future.
488 *
489 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
490 * table and setting the "obsolete_in" field.
491 *
492 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
493 * to the current JDK version. The system will flatly refuse to admit the existence of
494 * the flag. This allows a flag to die automatically over JDK releases.
495 *
496 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
497 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
498 * - Newly obsolete or expired deprecated options should have their global variable
499 * definitions removed (from globals.hpp, etc) and related implementations removed.
500 *
501 * Recommended approach for removing options:
502 *
503 * To remove options commonly used by customers (e.g. product -XX options), use
504 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
505 *
506 * To remove internal options (e.g. diagnostic, experimental, develop options), use
507 * a 2-step model adding major release numbers to the obsolete and expire columns.
508 *
509 * To change the name of an option, use the alias table as well as a 2-step
510 * model adding major release numbers to the deprecate and expire columns.
511 * Think twice about aliasing commonly used customer options.
512 *
513 * There are times when it is appropriate to leave a future release number as undefined.
514 *
515 * Tests: Aliases should be tested in VMAliasOptions.java.
516 * Deprecated options should be tested in VMDeprecatedOptions.java.
517 */
518
519 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
520 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
521 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
522 // the command-line as usual, but will issue a warning.
523 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
524 // the command-line, while issuing a warning and ignoring the flag value.
525 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
526 // existence of the flag.
527 //
528 // MANUAL CLEANUP ON JDK VERSION UPDATES:
529 // This table ensures that the handling of options will update automatically when the JDK
530 // version is incremented, but the source code needs to be cleanup up manually:
531 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
532 // variable should be removed, as well as users of the variable.
533 // - As "deprecated" options age into "obsolete" options, move the entry into the
534 // "Obsolete Flags" section of the table.
535 // - All expired options should be removed from the table.
536 static SpecialFlag const special_jvm_flags[] = {
537 // -------------- Deprecated Flags --------------
538 // --- Non-alias flags - sorted by obsolete_in then expired_in:
539 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
540 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
541 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
542 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
543 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
544 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
545 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
546 #ifdef _LP64
547 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
548 #endif
549 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
550 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
551 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
552 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
553 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
554 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
555
556 // -------------- Obsolete Flags - sorted by expired_in --------------
557
558 #ifdef LINUX
559 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
560 #endif
561 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
562 { "G1UpdateBufferSize", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
563 { "ShenandoahPacing", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
564 #if defined(AARCH64)
565 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
566 #endif
567
568 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
569 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
570 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
571 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
572 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
573 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
574 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
575 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
576 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
577 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
578 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
579 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
580 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
581 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
582 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
583 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
584
585 { "PretenureSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
586 { "HeapMaximumCompactionInterval",JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
587
588 #ifdef ASSERT
589 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
590 #endif
591
592 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
593 // These entries will generate build errors. Their purpose is to test the macros.
594 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
595 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
596 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
597 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
598 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
599 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
600 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
601 #endif
602
603 { nullptr, JDK_Version(0), JDK_Version(0) }
604 };
605
606 // Flags that are aliases for other flags.
607 typedef struct {
608 const char* alias_name;
609 const char* real_name;
610 } AliasedFlag;
611
612 static AliasedFlag const aliased_jvm_flags[] = {
613 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
614 { nullptr, nullptr}
615 };
616
617 // Return true if "v" is less than "other", where "other" may be "undefined".
618 static bool version_less_than(JDK_Version v, JDK_Version other) {
619 assert(!v.is_undefined(), "must be defined");
620 if (!other.is_undefined() && v.compare(other) >= 0) {
621 return false;
622 } else {
623 return true;
624 }
625 }
626
627 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
628 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
629 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
630 flag = special_jvm_flags[i];
631 return true;
632 }
633 }
634 return false;
635 }
636
637 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
638 assert(version != nullptr, "Must provide a version buffer");
639 SpecialFlag flag;
640 if (lookup_special_flag(flag_name, flag)) {
641 if (!flag.obsolete_in.is_undefined()) {
642 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
643 *version = flag.obsolete_in;
644 // This flag may have been marked for obsoletion in this version, but we may not
645 // have actually removed it yet. Rather than ignoring it as soon as we reach
646 // this version we allow some time for the removal to happen. So if the flag
647 // still actually exists we process it as normal, but issue an adjusted warning.
648 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
649 if (real_flag != nullptr) {
650 char version_str[256];
651 version->to_string(version_str, sizeof(version_str));
652 warning("Temporarily processing option %s; support is scheduled for removal in %s",
653 flag_name, version_str);
654 return false;
655 }
656 return true;
657 }
658 }
659 }
660 return false;
661 }
662
663 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
664 assert(version != nullptr, "Must provide a version buffer");
665 SpecialFlag flag;
666 if (lookup_special_flag(flag_name, flag)) {
667 if (!flag.deprecated_in.is_undefined()) {
668 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
669 version_less_than(JDK_Version::current(), flag.expired_in)) {
670 *version = flag.deprecated_in;
671 return 1;
672 } else {
673 return -1;
674 }
675 }
676 }
677 return 0;
678 }
679
680 const char* Arguments::real_flag_name(const char *flag_name) {
681 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
682 const AliasedFlag& flag_status = aliased_jvm_flags[i];
683 if (strcmp(flag_status.alias_name, flag_name) == 0) {
684 return flag_status.real_name;
685 }
686 }
687 return flag_name;
688 }
689
690 #ifdef ASSERT
691 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
692 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
693 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
694 return true;
695 }
696 }
697 return false;
698 }
699
700 // Verifies the correctness of the entries in the special_jvm_flags table.
701 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
702 // version being earlier than the deprecation version, then a warning is issued
703 // and verification fails - by returning false. If it is detected that the table
704 // is out of date, with respect to the current version, then ideally a warning is
705 // issued but verification does not fail. This allows the VM to operate when the
706 // version is first updated, without needing to update all the impacted flags at
707 // the same time. In practice we can't issue the warning immediately when the version
708 // is updated as it occurs for every test and some tests are not prepared to handle
709 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
710 // if the check_globals flag is true, and in addition allow a grace period and only
711 // check for stale flags when we hit build 25 (which is far enough into the 6 month
712 // release cycle that all flag updates should have been processed, whilst still
713 // leaving time to make the change before RDP2).
714 // We use a gtest to call this, passing true, so that we can detect stale flags before
715 // the end of the release cycle.
716
717 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
718
719 bool Arguments::verify_special_jvm_flags(bool check_globals) {
720 bool success = true;
721 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
722 const SpecialFlag& flag = special_jvm_flags[i];
723 if (lookup_special_flag(flag.name, i)) {
724 warning("Duplicate special flag declaration \"%s\"", flag.name);
725 success = false;
726 }
727 if (flag.deprecated_in.is_undefined() &&
728 flag.obsolete_in.is_undefined()) {
729 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
730 success = false;
731 }
732
733 if (!flag.deprecated_in.is_undefined()) {
734 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
735 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
736 success = false;
737 }
738
739 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
740 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
741 success = false;
742 }
743 }
744
745 if (!flag.obsolete_in.is_undefined()) {
746 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
747 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
748 success = false;
749 }
750
751 // if flag has become obsolete it should not have a "globals" flag defined anymore.
752 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
753 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
754 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
755 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
756 success = false;
757 }
758 }
759
760 } else if (!flag.expired_in.is_undefined()) {
761 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
762 success = false;
763 }
764
765 if (!flag.expired_in.is_undefined()) {
766 // if flag has become expired it should not have a "globals" flag defined anymore.
767 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
768 !version_less_than(JDK_Version::current(), flag.expired_in)) {
769 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
770 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
771 success = false;
772 }
773 }
774 }
775 }
776 return success;
777 }
778 #endif
779
780 bool Arguments::atojulong(const char *s, julong* result) {
781 return parse_integer(s, result);
782 }
783
784 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
785 if (size < min_size) return arg_too_small;
786 if (size > max_size) return arg_too_big;
787 return arg_in_range;
788 }
789
790 // Describe an argument out of range error
791 void Arguments::describe_range_error(ArgsRange errcode) {
792 switch(errcode) {
793 case arg_too_big:
794 jio_fprintf(defaultStream::error_stream(),
795 "The specified size exceeds the maximum "
796 "representable size.\n");
797 break;
798 case arg_too_small:
799 case arg_unreadable:
800 case arg_in_range:
801 // do nothing for now
802 break;
803 default:
804 ShouldNotReachHere();
805 }
806 }
807
808 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
809 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
810 return true;
811 } else {
812 return false;
813 }
814 }
815
816 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
817 // strtod allows leading whitespace, but our flag format does not.
818 if (*value == '\0' || isspace((unsigned char) *value)) {
819 return false;
820 }
821 char* end;
822 errno = 0;
823 double v = strtod(value, &end);
824 if ((errno != 0) || (*end != 0)) {
825 return false;
826 }
827 if (g_isnan(v) || !g_isfinite(v)) {
828 // Currently we cannot handle these special values.
829 return false;
830 }
831
832 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
833 return true;
834 }
835 return false;
836 }
837
838 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
839 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
840
841 if (flag->is_int()) {
842 int v;
843 if (parse_integer(value, &v)) {
844 result = JVMFlagAccess::set_int(flag, &v, origin);
845 }
846 } else if (flag->is_uint()) {
847 uint v;
848 if (parse_integer(value, &v)) {
849 result = JVMFlagAccess::set_uint(flag, &v, origin);
850 }
851 } else if (flag->is_intx()) {
852 intx v;
853 if (parse_integer(value, &v)) {
854 result = JVMFlagAccess::set_intx(flag, &v, origin);
855 }
856 } else if (flag->is_uintx()) {
857 uintx v;
858 if (parse_integer(value, &v)) {
859 result = JVMFlagAccess::set_uintx(flag, &v, origin);
860 }
861 } else if (flag->is_uint64_t()) {
862 uint64_t v;
863 if (parse_integer(value, &v)) {
864 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
865 }
866 } else if (flag->is_size_t()) {
867 size_t v;
868 if (parse_integer(value, &v)) {
869 result = JVMFlagAccess::set_size_t(flag, &v, origin);
870 }
871 }
872
873 return result == JVMFlag::SUCCESS;
874 }
875
876 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
877 if (value[0] == '\0') {
878 value = nullptr;
879 }
880 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
881 // Contract: JVMFlag always returns a pointer that needs freeing.
882 FREE_C_HEAP_ARRAY(char, value);
883 return true;
884 }
885
886 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
887 const char* old_value = "";
888 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
889 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
890 size_t new_len = strlen(new_value);
891 const char* value;
892 char* free_this_too = nullptr;
893 if (old_len == 0) {
894 value = new_value;
895 } else if (new_len == 0) {
896 value = old_value;
897 } else {
898 size_t length = old_len + 1 + new_len + 1;
899 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
900 // each new setting adds another LINE to the switch:
901 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
902 value = buf;
903 free_this_too = buf;
904 }
905 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
906 // JVMFlag always returns a pointer that needs freeing.
907 FREE_C_HEAP_ARRAY(char, value);
908 // JVMFlag made its own copy, so I must delete my own temp. buffer.
909 FREE_C_HEAP_ARRAY(char, free_this_too);
910 return true;
911 }
912
913 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
914 const char* real_name = real_flag_name(arg);
915 JDK_Version since = JDK_Version();
916 switch (is_deprecated_flag(arg, &since)) {
917 case -1: {
918 // Obsolete or expired, so don't process normally,
919 // but allow for an obsolete flag we're still
920 // temporarily allowing.
921 if (!is_obsolete_flag(arg, &since)) {
922 return real_name;
923 }
924 // Note if we're not considered obsolete then we can't be expired either
925 // as obsoletion must come first.
926 return nullptr;
927 }
928 case 0:
929 return real_name;
930 case 1: {
931 char version[256];
932 since.to_string(version, sizeof(version));
933 if (real_name != arg) {
934 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
935 arg, version, real_name);
936 } else {
937 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
938 arg, version);
939 }
940 return real_name;
941 }
942 }
943 ShouldNotReachHere();
944 return nullptr;
945 }
946
947 #define BUFLEN 255
948
949 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
950 char name_copied[BUFLEN+1];
951 if (name[name_length] != 0) {
952 if (name_length > BUFLEN) {
953 return nullptr;
954 } else {
955 strncpy(name_copied, name, name_length);
956 name_copied[name_length] = '\0';
957 name = name_copied;
958 }
959 }
960
961 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
962 if (real_name == nullptr) {
963 return nullptr;
964 }
965 JVMFlag* flag = JVMFlag::find_flag(real_name);
966 return flag;
967 }
968
969 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
970 bool is_bool = false;
971 bool bool_val = false;
972 char c = *arg;
973 if (c == '+' || c == '-') {
974 is_bool = true;
975 bool_val = (c == '+');
976 arg++;
977 }
978
979 const char* name = arg;
980 while (true) {
981 c = *arg;
982 if (isalnum(c) || (c == '_')) {
983 ++arg;
984 } else {
985 break;
986 }
987 }
988
989 size_t name_len = size_t(arg - name);
990 if (name_len == 0) {
991 return false;
992 }
993
994 JVMFlag* flag = find_jvm_flag(name, name_len);
995 if (flag == nullptr) {
996 return false;
997 }
998
999 if (is_bool) {
1000 if (*arg != 0) {
1001 // Error -- extra characters such as -XX:+BoolFlag=123
1002 return false;
1003 }
1004 return set_bool_flag(flag, bool_val, origin);
1005 }
1006
1007 if (arg[0] == '=') {
1008 const char* value = arg + 1;
1009 if (flag->is_ccstr()) {
1010 if (flag->ccstr_accumulates()) {
1011 return append_to_string_flag(flag, value, origin);
1012 } else {
1013 return set_string_flag(flag, value, origin);
1014 }
1015 } else if (flag->is_double()) {
1016 return set_fp_numeric_flag(flag, value, origin);
1017 } else {
1018 return set_numeric_flag(flag, value, origin);
1019 }
1020 }
1021
1022 if (arg[0] == ':' && arg[1] == '=') {
1023 // -XX:Foo:=xxx will reset the string flag to the given value.
1024 const char* value = arg + 2;
1025 return set_string_flag(flag, value, origin);
1026 }
1027
1028 return false;
1029 }
1030
1031 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1032 assert(bldarray != nullptr, "illegal argument");
1033
1034 if (arg == nullptr) {
1035 return;
1036 }
1037
1038 int new_count = *count + 1;
1039
1040 // expand the array and add arg to the last element
1041 if (*bldarray == nullptr) {
1042 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1043 } else {
1044 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1045 }
1046 (*bldarray)[*count] = os::strdup_check_oom(arg);
1047 *count = new_count;
1048 }
1049
1050 void Arguments::build_jvm_args(const char* arg) {
1051 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1052 }
1053
1054 void Arguments::build_jvm_flags(const char* arg) {
1055 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1056 }
1057
1058 // utility function to return a string that concatenates all
1059 // strings in a given char** array
1060 const char* Arguments::build_resource_string(char** args, int count) {
1061 if (args == nullptr || count == 0) {
1062 return nullptr;
1063 }
1064 size_t length = 0;
1065 for (int i = 0; i < count; i++) {
1066 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1067 }
1068 char* s = NEW_RESOURCE_ARRAY(char, length);
1069 char* dst = s;
1070 for (int j = 0; j < count; j++) {
1071 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1072 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1073 dst += offset;
1074 length -= offset;
1075 }
1076 return (const char*) s;
1077 }
1078
1079 void Arguments::print_on(outputStream* st) {
1080 st->print_cr("VM Arguments:");
1081 if (num_jvm_flags() > 0) {
1082 st->print("jvm_flags: "); print_jvm_flags_on(st);
1083 st->cr();
1084 }
1085 if (num_jvm_args() > 0) {
1086 st->print("jvm_args: "); print_jvm_args_on(st);
1087 st->cr();
1088 }
1089 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1090 if (_java_class_path != nullptr) {
1091 char* path = _java_class_path->value();
1092 size_t len = strlen(path);
1093 st->print("java_class_path (initial): ");
1094 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1095 if (len == 0) {
1096 st->print_raw_cr("<not set>");
1097 } else {
1098 st->print_raw_cr(path, len);
1099 }
1100 }
1101 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1102 }
1103
1104 void Arguments::print_summary_on(outputStream* st) {
1105 // Print the command line. Environment variables that are helpful for
1106 // reproducing the problem are written later in the hs_err file.
1107 // flags are from setting file
1108 if (num_jvm_flags() > 0) {
1109 st->print_raw("Settings File: ");
1110 print_jvm_flags_on(st);
1111 st->cr();
1112 }
1113 // args are the command line and environment variable arguments.
1114 st->print_raw("Command Line: ");
1115 if (num_jvm_args() > 0) {
1116 print_jvm_args_on(st);
1117 }
1118 // this is the classfile and any arguments to the java program
1119 if (java_command() != nullptr) {
1120 st->print("%s", java_command());
1121 }
1122 st->cr();
1123 }
1124
1125 void Arguments::print_jvm_flags_on(outputStream* st) {
1126 if (_num_jvm_flags > 0) {
1127 for (int i=0; i < _num_jvm_flags; i++) {
1128 st->print("%s ", _jvm_flags_array[i]);
1129 }
1130 }
1131 }
1132
1133 void Arguments::print_jvm_args_on(outputStream* st) {
1134 if (_num_jvm_args > 0) {
1135 for (int i=0; i < _num_jvm_args; i++) {
1136 st->print("%s ", _jvm_args_array[i]);
1137 }
1138 }
1139 }
1140
1141 bool Arguments::process_argument(const char* arg,
1142 jboolean ignore_unrecognized,
1143 JVMFlagOrigin origin) {
1144 JDK_Version since = JDK_Version();
1145
1146 if (parse_argument(arg, origin)) {
1147 return true;
1148 }
1149
1150 // Determine if the flag has '+', '-', or '=' characters.
1151 bool has_plus_minus = (*arg == '+' || *arg == '-');
1152 const char* const argname = has_plus_minus ? arg + 1 : arg;
1153
1154 size_t arg_len;
1155 const char* equal_sign = strchr(argname, '=');
1156 if (equal_sign == nullptr) {
1157 arg_len = strlen(argname);
1158 } else {
1159 arg_len = equal_sign - argname;
1160 }
1161
1162 // Only make the obsolete check for valid arguments.
1163 if (arg_len <= BUFLEN) {
1164 // Construct a string which consists only of the argument name without '+', '-', or '='.
1165 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1166 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1167 if (is_obsolete_flag(stripped_argname, &since)) {
1168 char version[256];
1169 since.to_string(version, sizeof(version));
1170 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1171 return true;
1172 }
1173 }
1174
1175 // For locked flags, report a custom error message if available.
1176 // Otherwise, report the standard unrecognized VM option.
1177 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1178 if (found_flag != nullptr) {
1179 char locked_message_buf[BUFLEN];
1180 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1181 if (strlen(locked_message_buf) != 0) {
1182 #ifdef PRODUCT
1183 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1184 if (ignore_unrecognized && mismatched) {
1185 return true;
1186 }
1187 #endif
1188 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1189 }
1190 if (found_flag->is_bool() && !has_plus_minus) {
1191 jio_fprintf(defaultStream::error_stream(),
1192 "Missing +/- setting for VM option '%s'\n", argname);
1193 } else if (!found_flag->is_bool() && has_plus_minus) {
1194 jio_fprintf(defaultStream::error_stream(),
1195 "Unexpected +/- setting in VM option '%s'\n", argname);
1196 } else {
1197 jio_fprintf(defaultStream::error_stream(),
1198 "Improperly specified VM option '%s'\n", argname);
1199 }
1200 } else {
1201 if (ignore_unrecognized) {
1202 return true;
1203 }
1204 jio_fprintf(defaultStream::error_stream(),
1205 "Unrecognized VM option '%s'\n", argname);
1206 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1207 if (fuzzy_matched != nullptr) {
1208 jio_fprintf(defaultStream::error_stream(),
1209 "Did you mean '%s%s%s'?\n",
1210 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1211 fuzzy_matched->name(),
1212 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1213 }
1214 }
1215
1216 // allow for commandline "commenting out" options like -XX:#+Verbose
1217 return arg[0] == '#';
1218 }
1219
1220 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1221 FILE* stream = os::fopen(file_name, "rb");
1222 if (stream == nullptr) {
1223 if (should_exist) {
1224 jio_fprintf(defaultStream::error_stream(),
1225 "Could not open settings file %s\n", file_name);
1226 return false;
1227 } else {
1228 return true;
1229 }
1230 }
1231
1232 char token[1024];
1233 int pos = 0;
1234
1235 bool in_white_space = true;
1236 bool in_comment = false;
1237 bool in_quote = false;
1238 int quote_c = 0;
1239 bool result = true;
1240
1241 int c = getc(stream);
1242 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1243 if (in_white_space) {
1244 if (in_comment) {
1245 if (c == '\n') in_comment = false;
1246 } else {
1247 if (c == '#') in_comment = true;
1248 else if (!isspace((unsigned char) c)) {
1249 in_white_space = false;
1250 token[pos++] = checked_cast<char>(c);
1251 }
1252 }
1253 } else {
1254 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1255 // token ends at newline, or at unquoted whitespace
1256 // this allows a way to include spaces in string-valued options
1257 token[pos] = '\0';
1258 logOption(token);
1259 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1260 build_jvm_flags(token);
1261 pos = 0;
1262 in_white_space = true;
1263 in_quote = false;
1264 } else if (!in_quote && (c == '\'' || c == '"')) {
1265 in_quote = true;
1266 quote_c = c;
1267 } else if (in_quote && (c == quote_c)) {
1268 in_quote = false;
1269 } else {
1270 token[pos++] = checked_cast<char>(c);
1271 }
1272 }
1273 c = getc(stream);
1274 }
1275 if (pos > 0) {
1276 token[pos] = '\0';
1277 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1278 build_jvm_flags(token);
1279 }
1280 fclose(stream);
1281 return result;
1282 }
1283
1284 //=============================================================================================================
1285 // Parsing of properties (-D)
1286
1287 const char* Arguments::get_property(const char* key) {
1288 return PropertyList_get_value(system_properties(), key);
1289 }
1290
1291 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1292 const char* eq = strchr(prop, '=');
1293 const char* key;
1294 const char* value = "";
1295
1296 if (eq == nullptr) {
1297 // property doesn't have a value, thus use passed string
1298 key = prop;
1299 } else {
1300 // property have a value, thus extract it and save to the
1301 // allocated string
1302 size_t key_len = eq - prop;
1303 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1304
1305 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1306 key = tmp_key;
1307
1308 value = &prop[key_len + 1];
1309 }
1310
1311 if (internal == ExternalProperty) {
1312 CDSConfig::check_incompatible_property(key, value);
1313 }
1314
1315 if (strcmp(key, "java.compiler") == 0) {
1316 // we no longer support java.compiler system property, log a warning and let it get
1317 // passed to Java, like any other system property
1318 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1319 // for applications using NONE or empty value, log a more informative message
1320 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1321 } else {
1322 warning("The java.compiler system property is obsolete and no longer supported.");
1323 }
1324 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1325 // append is true, writable is true, internal is false
1326 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1327 WriteableProperty, ExternalProperty);
1328 } else {
1329 if (strcmp(key, "sun.java.command") == 0) {
1330 char *old_java_command = _java_command;
1331 _java_command = os::strdup_check_oom(value, mtArguments);
1332 if (old_java_command != nullptr) {
1333 os::free(old_java_command);
1334 }
1335 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1336 // If this property is set on the command line then its value will be
1337 // displayed in VM error logs as the URL at which to submit such logs.
1338 // Normally the URL displayed in error logs is different from the value
1339 // of this system property, so a different property should have been
1340 // used here, but we leave this as-is in case someone depends upon it.
1341 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1342 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1343 // its value without going through the property list or making a Java call.
1344 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1345 if (old_java_vendor_url_bug != nullptr) {
1346 os::free((void *)old_java_vendor_url_bug);
1347 }
1348 }
1349
1350 // Create new property and add at the end of the list
1351 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1352 }
1353
1354 if (key != prop) {
1355 // SystemProperty copy passed value, thus free previously allocated
1356 // memory
1357 FreeHeap((void *)key);
1358 }
1359
1360 return true;
1361 }
1362
1363 //===========================================================================================================
1364 // Setting int/mixed/comp mode flags
1365
1366 void Arguments::set_mode_flags(Mode mode) {
1367 // Set up default values for all flags.
1368 // If you add a flag to any of the branches below,
1369 // add a default value for it here.
1370 _mode = mode;
1371
1372 // Ensure Agent_OnLoad has the correct initial values.
1373 // This may not be the final mode; mode may change later in onload phase.
1374 PropertyList_unique_add(&_system_properties, "java.vm.info",
1375 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1376
1377 UseInterpreter = true;
1378 UseCompiler = true;
1379 UseLoopCounter = true;
1380
1381 // Default values may be platform/compiler dependent -
1382 // use the saved values
1383 ClipInlining = Arguments::_ClipInlining;
1384 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1385 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1386 BackgroundCompilation = Arguments::_BackgroundCompilation;
1387
1388 // Change from defaults based on mode
1389 switch (mode) {
1390 default:
1391 ShouldNotReachHere();
1392 break;
1393 case _int:
1394 UseCompiler = false;
1395 UseLoopCounter = false;
1396 AlwaysCompileLoopMethods = false;
1397 UseOnStackReplacement = false;
1398 break;
1399 case _mixed:
1400 // same as default
1401 break;
1402 case _comp:
1403 UseInterpreter = false;
1404 BackgroundCompilation = false;
1405 ClipInlining = false;
1406 break;
1407 }
1408 }
1409
1410 // Conflict: required to use shared spaces (-Xshare:on), but
1411 // incompatible command line options were chosen.
1412 void Arguments::no_shared_spaces(const char* message) {
1413 if (RequireSharedSpaces) {
1414 aot_log_error(aot)("%s is incompatible with other specified options.",
1415 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1416 if (CDSConfig::new_aot_flags_used()) {
1417 vm_exit_during_initialization("Unable to use AOT cache", message);
1418 } else {
1419 vm_exit_during_initialization("Unable to use shared archive", message);
1420 }
1421 } else {
1422 if (CDSConfig::new_aot_flags_used()) {
1423 log_warning(aot)("Unable to use AOT cache: %s", message);
1424 } else {
1425 aot_log_info(aot)("Unable to use shared archive: %s", message);
1426 }
1427 UseSharedSpaces = false;
1428 }
1429 }
1430
1431 static void set_object_alignment() {
1432 // Object alignment.
1433 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1434 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1435 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1436 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1437 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1438 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1439
1440 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1441 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1442
1443 // Oop encoding heap max
1444 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1445 }
1446
1447 size_t Arguments::max_heap_for_compressed_oops() {
1448 // Avoid sign flip.
1449 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1450 // We need to fit both the null page and the heap into the memory budget, while
1451 // keeping alignment constraints of the heap. To guarantee the latter, as the
1452 // null page is located before the heap, we pad the null page to the conservative
1453 // maximum alignment that the GC may ever impose upon the heap.
1454 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1455 _conservative_max_heap_alignment);
1456
1457 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1458 NOT_LP64(ShouldNotReachHere(); return 0);
1459 }
1460
1461 void Arguments::set_use_compressed_oops() {
1462 #ifdef _LP64
1463 // MaxHeapSize is not set up properly at this point, but
1464 // the only value that can override MaxHeapSize if we are
1465 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1466 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1467
1468 if (max_heap_size <= max_heap_for_compressed_oops()) {
1469 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1470 FLAG_SET_ERGO(UseCompressedOops, true);
1471 }
1472 } else {
1473 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1474 warning("Max heap size too large for Compressed Oops");
1475 FLAG_SET_DEFAULT(UseCompressedOops, false);
1476 }
1477 }
1478 #endif // _LP64
1479 }
1480
1481 void Arguments::set_conservative_max_heap_alignment() {
1482 // The conservative maximum required alignment for the heap is the maximum of
1483 // the alignments imposed by several sources: any requirements from the heap
1484 // itself and the maximum page size we may run the VM with.
1485 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1486 _conservative_max_heap_alignment = MAX4(heap_alignment,
1487 os::vm_allocation_granularity(),
1488 os::max_page_size(),
1489 GCArguments::compute_heap_alignment());
1490 }
1491
1492 jint Arguments::set_ergonomics_flags() {
1493 GCConfig::initialize();
1494
1495 set_conservative_max_heap_alignment();
1496
1497 #ifdef _LP64
1498 set_use_compressed_oops();
1499
1500 // Also checks that certain machines are slower with compressed oops
1501 // in vm_version initialization code.
1502 #endif // _LP64
1503
1504 return JNI_OK;
1505 }
1506
1507 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1508 // The AggressiveHeap check is a temporary workaround to avoid calling
1509 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1510 // selected. This works because AggressiveHeap implies UseParallelGC
1511 // where we know the ratio will be 1. Once the AggressiveHeap option is
1512 // removed, this can be cleaned up.
1513 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1514 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1515 size_t max_allocatable = os::commit_memory_limit();
1516
1517 return MIN2(limit, max_allocatable / fraction);
1518 }
1519
1520 // Use static initialization to get the default before parsing
1521 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1522
1523 static size_t clamp_by_size_t_max(uint64_t value) {
1524 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1525 }
1526
1527 void Arguments::set_heap_size() {
1528 // Check if the user has configured any limit on the amount of RAM we may use.
1529 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1530 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1531 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1532 !FLAG_IS_DEFAULT(MaxRAM);
1533
1534 if (FLAG_IS_DEFAULT(MaxRAM)) {
1535 if (CompilerConfig::should_set_client_emulation_mode_flags()) {
1536 // Limit the available memory if client emulation mode is enabled.
1537 FLAG_SET_ERGO(MaxRAM, 1ULL*G);
1538 } else {
1539 // Use the available physical memory on the system.
1540 FLAG_SET_ERGO(MaxRAM, os::physical_memory());
1541 }
1542 }
1543
1544 // If the maximum heap size has not been set with -Xmx, then set it as
1545 // fraction of the size of physical memory, respecting the maximum and
1546 // minimum sizes of the heap.
1547 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1548 uint64_t min_memory = (uint64_t)(((double)MaxRAM * MinRAMPercentage) / 100);
1549 uint64_t max_memory = (uint64_t)(((double)MaxRAM * MaxRAMPercentage) / 100);
1550
1551 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1552 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1553
1554 if (reasonable_min < MaxHeapSize) {
1555 // Small physical memory, so use a minimum fraction of it for the heap
1556 reasonable_max = reasonable_min;
1557 } else {
1558 // Not-small physical memory, so require a heap at least
1559 // as large as MaxHeapSize
1560 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1561 }
1562
1563 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1564 // Limit the heap size to ErgoHeapSizeLimit
1565 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1566 }
1567
1568 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1569
1570 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1571 // An initial heap size was specified on the command line,
1572 // so be sure that the maximum size is consistent. Done
1573 // after call to limit_heap_by_allocatable_memory because that
1574 // method might reduce the allocation size.
1575 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1576 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1577 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1578 }
1579
1580 #ifdef _LP64
1581 if (UseCompressedOops || UseCompressedClassPointers) {
1582 // HeapBaseMinAddress can be greater than default but not less than.
1583 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1584 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1585 // matches compressed oops printing flags
1586 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1587 "(%zuG) which is greater than value given %zu",
1588 DefaultHeapBaseMinAddress,
1589 DefaultHeapBaseMinAddress/G,
1590 HeapBaseMinAddress);
1591 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1592 }
1593 }
1594 }
1595
1596 if (UseCompressedOops) {
1597 size_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1598 size_t max_coop_heap = max_heap_for_compressed_oops();
1599
1600 // Limit the heap size to the maximum possible when using compressed oops
1601 if (heap_end < max_coop_heap) {
1602 // Heap should be above HeapBaseMinAddress to get zero based compressed
1603 // oops but it should be not less than default MaxHeapSize.
1604 max_coop_heap -= HeapBaseMinAddress;
1605 }
1606
1607 // If the user has configured any limit on the amount of RAM we may use,
1608 // then disable compressed oops if the calculated max exceeds max_coop_heap
1609 // and UseCompressedOops was not specified.
1610 if (reasonable_max > max_coop_heap) {
1611 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1612 aot_log_info(aot)("UseCompressedOops disabled due to "
1613 "max heap %zu > compressed oop heap %zu. "
1614 "Please check the setting of MaxRAMPercentage %5.2f.",
1615 reasonable_max, max_coop_heap, MaxRAMPercentage);
1616 FLAG_SET_ERGO(UseCompressedOops, false);
1617 } else {
1618 reasonable_max = max_coop_heap;
1619 }
1620 }
1621 }
1622 #endif // _LP64
1623
1624 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1625 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1626 }
1627
1628 // If the minimum or initial heap_size have not been set or requested to be set
1629 // ergonomically, set them accordingly.
1630 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1631 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1632 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1633 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1634
1635 if (InitialHeapSize == 0) {
1636 uint64_t initial_memory = (uint64_t)(((double)MaxRAM * InitialRAMPercentage) / 100);
1637 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1638 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1639
1640 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1641 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1642
1643 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1644 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1645 }
1646
1647 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1648 // synchronize with InitialHeapSize to avoid errors with the default value.
1649 if (MinHeapSize == 0) {
1650 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1651 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1652 }
1653 }
1654 }
1655
1656 // This option inspects the machine and attempts to set various
1657 // parameters to be optimal for long-running, memory allocation
1658 // intensive jobs. It is intended for machines with large
1659 // amounts of cpu and memory.
1660 jint Arguments::set_aggressive_heap_flags() {
1661 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1662 // VM, but we may not be able to represent the total physical memory
1663 // available (like having 8gb of memory on a box but using a 32bit VM).
1664 // Thus, we need to make sure we're using a julong for intermediate
1665 // calculations.
1666 julong initHeapSize;
1667 physical_memory_size_type phys_mem = os::physical_memory();
1668 julong total_memory = static_cast<julong>(phys_mem);
1669
1670 if (total_memory < (julong) 256 * M) {
1671 jio_fprintf(defaultStream::error_stream(),
1672 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1673 vm_exit(1);
1674 }
1675
1676 // The heap size is half of available memory, or (at most)
1677 // all of possible memory less 160mb (leaving room for the OS
1678 // when using ISM). This is the maximum; because adaptive sizing
1679 // is turned on below, the actual space used may be smaller.
1680
1681 initHeapSize = MIN2(total_memory / (julong) 2,
1682 total_memory - (julong) 160 * M);
1683
1684 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1685
1686 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1687 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1688 return JNI_EINVAL;
1689 }
1690 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1691 return JNI_EINVAL;
1692 }
1693 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1694 return JNI_EINVAL;
1695 }
1696 }
1697 if (FLAG_IS_DEFAULT(NewSize)) {
1698 // Make the young generation 3/8ths of the total heap.
1699 if (FLAG_SET_CMDLINE(NewSize,
1700 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1701 return JNI_EINVAL;
1702 }
1703 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1704 return JNI_EINVAL;
1705 }
1706 }
1707
1708 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1709 FLAG_SET_DEFAULT(UseLargePages, true);
1710 #endif
1711
1712 // Increase some data structure sizes for efficiency
1713 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1714 return JNI_EINVAL;
1715 }
1716 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1717 return JNI_EINVAL;
1718 }
1719
1720 // See the OldPLABSize comment below, but replace 'after promotion'
1721 // with 'after copying'. YoungPLABSize is the size of the survivor
1722 // space per-gc-thread buffers. The default is 4kw.
1723 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1724 return JNI_EINVAL;
1725 }
1726
1727 // OldPLABSize is the size of the buffers in the old gen that
1728 // UseParallelGC uses to promote live data that doesn't fit in the
1729 // survivor spaces. At any given time, there's one for each gc thread.
1730 // The default size is 1kw. These buffers are rarely used, since the
1731 // survivor spaces are usually big enough. For specjbb, however, there
1732 // are occasions when there's lots of live data in the young gen
1733 // and we end up promoting some of it. We don't have a definite
1734 // explanation for why bumping OldPLABSize helps, but the theory
1735 // is that a bigger PLAB results in retaining something like the
1736 // original allocation order after promotion, which improves mutator
1737 // locality. A minor effect may be that larger PLABs reduce the
1738 // number of PLAB allocation events during gc. The value of 8kw
1739 // was arrived at by experimenting with specjbb.
1740 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1741 return JNI_EINVAL;
1742 }
1743
1744 // Enable parallel GC and adaptive generation sizing
1745 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1746 return JNI_EINVAL;
1747 }
1748
1749 // Encourage steady state memory management
1750 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1751 return JNI_EINVAL;
1752 }
1753
1754 return JNI_OK;
1755 }
1756
1757 // This must be called after ergonomics.
1758 void Arguments::set_bytecode_flags() {
1759 if (!RewriteBytecodes) {
1760 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1761 }
1762 }
1763
1764 // Aggressive optimization flags
1765 jint Arguments::set_aggressive_opts_flags() {
1766 #ifdef COMPILER2
1767 if (AggressiveUnboxing) {
1768 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1769 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1770 } else if (!EliminateAutoBox) {
1771 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1772 AggressiveUnboxing = false;
1773 }
1774 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1775 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1776 } else if (!DoEscapeAnalysis) {
1777 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1778 AggressiveUnboxing = false;
1779 }
1780 }
1781 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1782 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1783 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1784 }
1785 // Feed the cache size setting into the JDK
1786 char buffer[1024];
1787 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1788 if (!add_property(buffer)) {
1789 return JNI_ENOMEM;
1790 }
1791 }
1792 #endif
1793
1794 return JNI_OK;
1795 }
1796
1797 //===========================================================================================================
1798
1799 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1800 if (_sun_java_launcher != _default_java_launcher) {
1801 os::free(const_cast<char*>(_sun_java_launcher));
1802 }
1803 _sun_java_launcher = os::strdup_check_oom(launcher);
1804 }
1805
1806 bool Arguments::created_by_java_launcher() {
1807 assert(_sun_java_launcher != nullptr, "property must have value");
1808 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1809 }
1810
1811 bool Arguments::executing_unit_tests() {
1812 return _executing_unit_tests;
1813 }
1814
1815 //===========================================================================================================
1816 // Parsing of main arguments
1817
1818 static unsigned int addreads_count = 0;
1819 static unsigned int addexports_count = 0;
1820 static unsigned int addopens_count = 0;
1821 static unsigned int enable_native_access_count = 0;
1822 static bool patch_mod_javabase = false;
1823
1824 // Check the consistency of vm_init_args
1825 bool Arguments::check_vm_args_consistency() {
1826 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1827 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
1828 return false;
1829 }
1830
1831 // Method for adding checks for flag consistency.
1832 // The intent is to warn the user of all possible conflicts,
1833 // before returning an error.
1834 // Note: Needs platform-dependent factoring.
1835 bool status = true;
1836
1837 if (TLABRefillWasteFraction == 0) {
1838 jio_fprintf(defaultStream::error_stream(),
1839 "TLABRefillWasteFraction should be a denominator, "
1840 "not %zu\n",
1841 TLABRefillWasteFraction);
1842 status = false;
1843 }
1844
1845 status = CompilerConfig::check_args_consistency(status);
1846 #if INCLUDE_JVMCI
1847 if (status && EnableJVMCI) {
1848 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1849 // was explicitly set on the command line or in the jimage.
1850 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1851 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1852 return false;
1853 }
1854 }
1855 }
1856 #endif
1857
1858 #if INCLUDE_JFR
1859 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1860 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1861 return false;
1862 }
1863 }
1864 #endif
1865
1866 #ifndef SUPPORT_RESERVED_STACK_AREA
1867 if (StackReservedPages != 0) {
1868 FLAG_SET_CMDLINE(StackReservedPages, 0);
1869 warning("Reserved Stack Area not supported on this platform");
1870 }
1871 #endif
1872
1873 return status;
1874 }
1875
1876 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1877 const char* option_type) {
1878 if (ignore) return false;
1879
1880 const char* spacer = " ";
1881 if (option_type == nullptr) {
1882 option_type = ++spacer; // Set both to the empty string.
1883 }
1884
1885 jio_fprintf(defaultStream::error_stream(),
1886 "Unrecognized %s%soption: %s\n", option_type, spacer,
1887 option->optionString);
1888 return true;
1889 }
1890
1891 static const char* user_assertion_options[] = {
1892 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1893 };
1894
1895 static const char* system_assertion_options[] = {
1896 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1897 };
1898
1899 bool Arguments::parse_uint(const char* value,
1900 uint* uint_arg,
1901 uint min_size) {
1902 uint n;
1903 if (!parse_integer(value, &n)) {
1904 return false;
1905 }
1906 if (n >= min_size) {
1907 *uint_arg = n;
1908 return true;
1909 } else {
1910 return false;
1911 }
1912 }
1913
1914 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1915 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1916 CDSConfig::check_internal_module_property(prop_name, prop_value);
1917 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1918 char* property = AllocateHeap(prop_len, mtArguments);
1919 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1920 if (ret < 0 || ret >= (int)prop_len) {
1921 FreeHeap(property);
1922 return false;
1923 }
1924 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1925 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1926 // that multiple occurrences of the associated flag just causes the existing property value to be
1927 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1928 // to a property after we have finished flag processing.
1929 bool added = add_property(property, WriteableProperty, internal);
1930 FreeHeap(property);
1931 return added;
1932 }
1933
1934 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1935 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1936 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1937 const unsigned int props_count_limit = 1000;
1938 const int max_digits = 3;
1939 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1940
1941 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1942 if (count < props_count_limit) {
1943 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1944 char* property = AllocateHeap(prop_len, mtArguments);
1945 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1946 if (ret < 0 || ret >= (int)prop_len) {
1947 FreeHeap(property);
1948 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1949 return false;
1950 }
1951 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1952 FreeHeap(property);
1953 return added;
1954 }
1955
1956 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1957 return false;
1958 }
1959
1960 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1961 julong* long_arg,
1962 julong min_size,
1963 julong max_size) {
1964 if (!parse_integer(s, long_arg)) return arg_unreadable;
1965 return check_memory_size(*long_arg, min_size, max_size);
1966 }
1967
1968 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1969 // Save default settings for some mode flags
1970 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1971 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1972 Arguments::_ClipInlining = ClipInlining;
1973 Arguments::_BackgroundCompilation = BackgroundCompilation;
1974
1975 // Remember the default value of SharedBaseAddress.
1976 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1977
1978 // Setup flags for mixed which is the default
1979 set_mode_flags(_mixed);
1980
1981 jint result;
1982 for (int i = 0; i < all_args->length(); i++) {
1983 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1984 if (result != JNI_OK) {
1985 return result;
1986 }
1987 }
1988
1989 // Disable CDS for exploded image
1990 if (!has_jimage()) {
1991 no_shared_spaces("CDS disabled on exploded JDK");
1992 }
1993
1994 if (UseAltSubstitutabilityMethod) {
1995 no_shared_spaces("Alternate substitutability method doesn't work with CDS yet");
1996 }
1997
1998 // We need to ensure processor and memory resources have been properly
1999 // configured - which may rely on arguments we just processed - before
2000 // doing the final argument processing. Any argument processing that
2001 // needs to know about processor and memory resources must occur after
2002 // this point.
2003
2004 os::init_container_support();
2005
2006 SystemMemoryBarrier::initialize();
2007
2008 // Do final processing now that all arguments have been parsed
2009 result = finalize_vm_init_args();
2010 if (result != JNI_OK) {
2011 return result;
2012 }
2013
2014 return JNI_OK;
2015 }
2016
2017 #if !INCLUDE_JVMTI || INCLUDE_CDS
2018 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2019 // represents a valid JDWP agent. is_path==true denotes that we
2020 // are dealing with -agentpath (case where name is a path), otherwise with
2021 // -agentlib
2022 static bool valid_jdwp_agent(char *name, bool is_path) {
2023 char *_name;
2024 const char *_jdwp = "jdwp";
2025 size_t _len_jdwp, _len_prefix;
2026
2027 if (is_path) {
2028 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2029 return false;
2030 }
2031
2032 _name++; // skip past last path separator
2033 _len_prefix = strlen(JNI_LIB_PREFIX);
2034
2035 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2036 return false;
2037 }
2038
2039 _name += _len_prefix;
2040 _len_jdwp = strlen(_jdwp);
2041
2042 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2043 _name += _len_jdwp;
2044 }
2045 else {
2046 return false;
2047 }
2048
2049 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2050 return false;
2051 }
2052
2053 return true;
2054 }
2055
2056 if (strcmp(name, _jdwp) == 0) {
2057 return true;
2058 }
2059
2060 return false;
2061 }
2062 #endif
2063
2064 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2065 // --patch-module=<module>=<file>(<pathsep><file>)*
2066 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2067 // Find the equal sign between the module name and the path specification
2068 const char* module_equal = strchr(patch_mod_tail, '=');
2069 if (module_equal == nullptr) {
2070 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2071 return JNI_ERR;
2072 } else {
2073 // Pick out the module name
2074 size_t module_len = module_equal - patch_mod_tail;
2075 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2076 if (module_name != nullptr) {
2077 memcpy(module_name, patch_mod_tail, module_len);
2078 *(module_name + module_len) = '\0';
2079 // The path piece begins one past the module_equal sign
2080 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2081 FREE_C_HEAP_ARRAY(char, module_name);
2082 } else {
2083 return JNI_ENOMEM;
2084 }
2085 }
2086 return JNI_OK;
2087 }
2088
2089 // Temporary system property to disable preview patching and enable the new preview mode
2090 // feature for testing/development. Once the preview mode feature is finished, the value
2091 // will be always 'true' and this code, and all related dead-code can be removed.
2092 #define DISABLE_PREVIEW_PATCHING_DEFAULT false
2093
2094 bool Arguments::disable_preview_patching() {
2095 const char* prop = get_property("DISABLE_PREVIEW_PATCHING");
2096 return (prop != nullptr)
2097 ? strncmp(prop, "true", strlen("true")) == 0
2098 : DISABLE_PREVIEW_PATCHING_DEFAULT;
2099 }
2100
2101 // VALUECLASS_STR must match string used in the build
2102 #define VALUECLASS_STR "valueclasses"
2103 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2104
2105 // Finalize --patch-module args and --enable-preview related to value class module patches.
2106 // Create all numbered properties passing module patches.
2107 int Arguments::finalize_patch_module() {
2108 // If --enable-preview and EnableValhalla is true, modules may have preview mode resources.
2109 bool enable_valhalla_preview = enable_preview() && EnableValhalla;
2110 // Whether to use module patching, or the new preview mode feature for preview resources.
2111 bool disable_patching = disable_preview_patching();
2112
2113 // This must be called, even with 'false', to enable resource lookup from JImage.
2114 ClassLoader::init_jimage(disable_patching && enable_valhalla_preview);
2115
2116 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2117 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2118 if (!disable_patching && enable_valhalla_preview) {
2119 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2120 const char * fileSep = os::file_separator();
2121
2122 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2123 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2124 DIR* dir = os::opendir(valueclasses_dir);
2125 if (dir != nullptr) {
2126 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2127 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2128
2129 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2130 // Test if file ends-with "-valueclasses.jar"
2131 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2132 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2133 continue; // too short or not the expected suffix
2134 }
2135
2136 strcpy(module_name, entry->d_name);
2137 module_name[len] = '\0'; // truncate to just module-name
2138
2139 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2140 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2141 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2142 }
2143 FreeHeap(module_name);
2144 FreeHeap(path);
2145 os::closedir(dir);
2146 }
2147 FreeHeap(valueclasses_dir);
2148 }
2149
2150 // Create numbered properties for each module that has been patched either
2151 // by --patch-module (or --enable-preview if disable_patching is false).
2152 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2153 if (_patch_mod_prefix != nullptr) {
2154 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2155 unsigned int patch_mod_count = 0;
2156
2157 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2158 it != _patch_mod_prefix->end(); ++it) {
2159 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2160 (*it)->module_name(), (*it)->path_string());
2161 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2162 FreeHeap(prop_value);
2163 return JNI_ENOMEM;
2164 }
2165 }
2166 FreeHeap(prop_value);
2167 }
2168 return JNI_OK;
2169 }
2170
2171 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2172 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2173 // The min and max sizes match the values in globals.hpp, but scaled
2174 // with K. The values have been chosen so that alignment with page
2175 // size doesn't change the max value, which makes the conversions
2176 // back and forth between Xss value and ThreadStackSize value easier.
2177 // The values have also been chosen to fit inside a 32-bit signed type.
2178 const julong min_ThreadStackSize = 0;
2179 const julong max_ThreadStackSize = 1 * M;
2180
2181 // Make sure the above values match the range set in globals.hpp
2182 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2183 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2184 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2185
2186 const julong min_size = min_ThreadStackSize * K;
2187 const julong max_size = max_ThreadStackSize * K;
2188
2189 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2190
2191 julong size = 0;
2192 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2193 if (errcode != arg_in_range) {
2194 bool silent = (option == nullptr); // Allow testing to silence error messages
2195 if (!silent) {
2196 jio_fprintf(defaultStream::error_stream(),
2197 "Invalid thread stack size: %s\n", option->optionString);
2198 describe_range_error(errcode);
2199 }
2200 return JNI_EINVAL;
2201 }
2202
2203 // Internally track ThreadStackSize in units of 1024 bytes.
2204 const julong size_aligned = align_up(size, K);
2205 assert(size <= size_aligned,
2206 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2207 size, size_aligned);
2208
2209 const julong size_in_K = size_aligned / K;
2210 assert(size_in_K < (julong)max_intx,
2211 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2212 size_in_K);
2213
2214 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2215 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2216 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2217 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2218 max_expanded, size_in_K);
2219
2220 *out_ThreadStackSize = (intx)size_in_K;
2221
2222 return JNI_OK;
2223 }
2224
2225 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2226 // For match_option to return remaining or value part of option string
2227 const char* tail;
2228
2229 // iterate over arguments
2230 for (int index = 0; index < args->nOptions; index++) {
2231 bool is_absolute_path = false; // for -agentpath vs -agentlib
2232
2233 const JavaVMOption* option = args->options + index;
2234
2235 if (!match_option(option, "-Djava.class.path", &tail) &&
2236 !match_option(option, "-Dsun.java.command", &tail) &&
2237 !match_option(option, "-Dsun.java.launcher", &tail)) {
2238
2239 // add all jvm options to the jvm_args string. This string
2240 // is used later to set the java.vm.args PerfData string constant.
2241 // the -Djava.class.path and the -Dsun.java.command options are
2242 // omitted from jvm_args string as each have their own PerfData
2243 // string constant object.
2244 build_jvm_args(option->optionString);
2245 }
2246
2247 // -verbose:[class/module/gc/jni]
2248 if (match_option(option, "-verbose", &tail)) {
2249 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2250 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2251 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2252 } else if (!strcmp(tail, ":module")) {
2253 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2254 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2255 } else if (!strcmp(tail, ":gc")) {
2256 if (_legacyGCLogging.lastFlag == 0) {
2257 _legacyGCLogging.lastFlag = 1;
2258 }
2259 } else if (!strcmp(tail, ":jni")) {
2260 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2261 }
2262 // -da / -ea / -disableassertions / -enableassertions
2263 // These accept an optional class/package name separated by a colon, e.g.,
2264 // -da:java.lang.Thread.
2265 } else if (match_option(option, user_assertion_options, &tail, true)) {
2266 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2267 if (*tail == '\0') {
2268 JavaAssertions::setUserClassDefault(enable);
2269 } else {
2270 assert(*tail == ':', "bogus match by match_option()");
2271 JavaAssertions::addOption(tail + 1, enable);
2272 }
2273 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2274 } else if (match_option(option, system_assertion_options, &tail, false)) {
2275 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2276 JavaAssertions::setSystemClassDefault(enable);
2277 // -bootclasspath:
2278 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2279 jio_fprintf(defaultStream::output_stream(),
2280 "-Xbootclasspath is no longer a supported option.\n");
2281 return JNI_EINVAL;
2282 // -bootclasspath/a:
2283 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2284 Arguments::append_sysclasspath(tail);
2285 // -bootclasspath/p:
2286 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2287 jio_fprintf(defaultStream::output_stream(),
2288 "-Xbootclasspath/p is no longer a supported option.\n");
2289 return JNI_EINVAL;
2290 // -Xrun
2291 } else if (match_option(option, "-Xrun", &tail)) {
2292 if (tail != nullptr) {
2293 const char* pos = strchr(tail, ':');
2294 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2295 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2296 jio_snprintf(name, len + 1, "%s", tail);
2297
2298 char *options = nullptr;
2299 if(pos != nullptr) {
2300 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2301 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2302 }
2303 #if !INCLUDE_JVMTI
2304 if (strcmp(name, "jdwp") == 0) {
2305 jio_fprintf(defaultStream::error_stream(),
2306 "Debugging agents are not supported in this VM\n");
2307 return JNI_ERR;
2308 }
2309 #endif // !INCLUDE_JVMTI
2310 JvmtiAgentList::add_xrun(name, options, false);
2311 FREE_C_HEAP_ARRAY(char, name);
2312 FREE_C_HEAP_ARRAY(char, options);
2313 }
2314 } else if (match_option(option, "--add-reads=", &tail)) {
2315 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2316 return JNI_ENOMEM;
2317 }
2318 } else if (match_option(option, "--add-exports=", &tail)) {
2319 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2320 return JNI_ENOMEM;
2321 }
2322 } else if (match_option(option, "--add-opens=", &tail)) {
2323 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2324 return JNI_ENOMEM;
2325 }
2326 } else if (match_option(option, "--add-modules=", &tail)) {
2327 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2328 return JNI_ENOMEM;
2329 }
2330 #if INCLUDE_JVMCI
2331 if (!_jvmci_module_added) {
2332 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2333 if (jvmci_module != nullptr) {
2334 char before = *(jvmci_module - 1);
2335 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2336 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2337 FLAG_SET_DEFAULT(EnableJVMCI, true);
2338 _jvmci_module_added = true;
2339 }
2340 }
2341 }
2342 #endif
2343 } else if (match_option(option, "--enable-native-access=", &tail)) {
2344 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2345 return JNI_ENOMEM;
2346 }
2347 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2348 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2349 return JNI_ENOMEM;
2350 }
2351 } else if (match_option(option, "--limit-modules=", &tail)) {
2352 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2353 return JNI_ENOMEM;
2354 }
2355 } else if (match_option(option, "--module-path=", &tail)) {
2356 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2357 return JNI_ENOMEM;
2358 }
2359 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2360 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2361 return JNI_ENOMEM;
2362 }
2363 } else if (match_option(option, "--patch-module=", &tail)) {
2364 // --patch-module=<module>=<file>(<pathsep><file>)*
2365 int res = process_patch_mod_option(tail);
2366 if (res != JNI_OK) {
2367 return res;
2368 }
2369 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2370 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2371 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2372 AddProperty, WriteableProperty, InternalProperty);
2373 } else {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2376 return JNI_ERR;
2377 }
2378 } else if (match_option(option, "--illegal-access=", &tail)) {
2379 char version[256];
2380 JDK_Version::jdk(17).to_string(version, sizeof(version));
2381 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2382 // -agentlib and -agentpath
2383 } else if (match_option(option, "-agentlib:", &tail) ||
2384 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2385 if(tail != nullptr) {
2386 const char* pos = strchr(tail, '=');
2387 char* name;
2388 if (pos == nullptr) {
2389 name = os::strdup_check_oom(tail, mtArguments);
2390 } else {
2391 size_t len = pos - tail;
2392 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2393 memcpy(name, tail, len);
2394 name[len] = '\0';
2395 }
2396
2397 char *options = nullptr;
2398 if(pos != nullptr) {
2399 options = os::strdup_check_oom(pos + 1, mtArguments);
2400 }
2401 #if !INCLUDE_JVMTI
2402 if (valid_jdwp_agent(name, is_absolute_path)) {
2403 jio_fprintf(defaultStream::error_stream(),
2404 "Debugging agents are not supported in this VM\n");
2405 return JNI_ERR;
2406 }
2407 #elif INCLUDE_CDS
2408 if (valid_jdwp_agent(name, is_absolute_path)) {
2409 _has_jdwp_agent = true;
2410 }
2411 #endif // !INCLUDE_JVMTI
2412 JvmtiAgentList::add(name, options, is_absolute_path);
2413 os::free(name);
2414 os::free(options);
2415 }
2416 // -javaagent
2417 } else if (match_option(option, "-javaagent:", &tail)) {
2418 #if !INCLUDE_JVMTI
2419 jio_fprintf(defaultStream::error_stream(),
2420 "Instrumentation agents are not supported in this VM\n");
2421 return JNI_ERR;
2422 #else
2423 if (tail != nullptr) {
2424 size_t length = strlen(tail) + 1;
2425 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2426 jio_snprintf(options, length, "%s", tail);
2427 JvmtiAgentList::add("instrument", options, false);
2428 FREE_C_HEAP_ARRAY(char, options);
2429
2430 // java agents need module java.instrument
2431 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2432 return JNI_ENOMEM;
2433 }
2434 }
2435 #endif // !INCLUDE_JVMTI
2436 // --enable_preview
2437 } else if (match_option(option, "--enable-preview")) {
2438 set_enable_preview();
2439 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2440 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2441 return JNI_EINVAL;
2442 }
2443 // -Xnoclassgc
2444 } else if (match_option(option, "-Xnoclassgc")) {
2445 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2446 return JNI_EINVAL;
2447 }
2448 // -Xbatch
2449 } else if (match_option(option, "-Xbatch")) {
2450 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2451 return JNI_EINVAL;
2452 }
2453 // -Xmn for compatibility with other JVM vendors
2454 } else if (match_option(option, "-Xmn", &tail)) {
2455 julong long_initial_young_size = 0;
2456 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2457 if (errcode != arg_in_range) {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Invalid initial young generation size: %s\n", option->optionString);
2460 describe_range_error(errcode);
2461 return JNI_EINVAL;
2462 }
2463 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2464 return JNI_EINVAL;
2465 }
2466 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2467 return JNI_EINVAL;
2468 }
2469 // -Xms
2470 } else if (match_option(option, "-Xms", &tail)) {
2471 julong size = 0;
2472 // an initial heap size of 0 means automatically determine
2473 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2474 if (errcode != arg_in_range) {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Invalid initial heap size: %s\n", option->optionString);
2477 describe_range_error(errcode);
2478 return JNI_EINVAL;
2479 }
2480 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2481 return JNI_EINVAL;
2482 }
2483 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2484 return JNI_EINVAL;
2485 }
2486 // -Xmx
2487 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2488 julong long_max_heap_size = 0;
2489 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2490 if (errcode != arg_in_range) {
2491 jio_fprintf(defaultStream::error_stream(),
2492 "Invalid maximum heap size: %s\n", option->optionString);
2493 describe_range_error(errcode);
2494 return JNI_EINVAL;
2495 }
2496 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2497 return JNI_EINVAL;
2498 }
2499 // Xmaxf
2500 } else if (match_option(option, "-Xmaxf", &tail)) {
2501 char* err;
2502 double dmaxf = strtod(tail, &err);
2503 if (*err != '\0' || *tail == '\0') {
2504 jio_fprintf(defaultStream::error_stream(),
2505 "Bad max heap free ratio: %s\n",
2506 option->optionString);
2507 return JNI_EINVAL;
2508 }
2509 if (dmaxf < 0.0 || dmaxf > 1.0) {
2510 jio_fprintf(defaultStream::error_stream(),
2511 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2512 option->optionString);
2513 return JNI_EINVAL;
2514 }
2515 const uintx umaxf = (uintx)(dmaxf * 100);
2516 if (MinHeapFreeRatio > umaxf) {
2517 jio_fprintf(defaultStream::error_stream(),
2518 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2519 tail, MinHeapFreeRatio / 100.0f);
2520 return JNI_EINVAL;
2521 }
2522 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2523 return JNI_EINVAL;
2524 }
2525 // Xminf
2526 } else if (match_option(option, "-Xminf", &tail)) {
2527 char* err;
2528 double dminf = strtod(tail, &err);
2529 if (*err != '\0' || *tail == '\0') {
2530 jio_fprintf(defaultStream::error_stream(),
2531 "Bad min heap free ratio: %s\n",
2532 option->optionString);
2533 return JNI_EINVAL;
2534 }
2535 if (dminf < 0.0 || dminf > 1.0) {
2536 jio_fprintf(defaultStream::error_stream(),
2537 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2538 tail);
2539 return JNI_EINVAL;
2540 }
2541 const uintx uminf = (uintx)(dminf * 100);
2542 if (MaxHeapFreeRatio < uminf) {
2543 jio_fprintf(defaultStream::error_stream(),
2544 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2545 tail, MaxHeapFreeRatio / 100.0f);
2546 return JNI_EINVAL;
2547 }
2548 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2549 return JNI_EINVAL;
2550 }
2551 // -Xss
2552 } else if (match_option(option, "-Xss", &tail)) {
2553 intx value = 0;
2554 jint err = parse_xss(option, tail, &value);
2555 if (err != JNI_OK) {
2556 return err;
2557 }
2558 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2559 return JNI_EINVAL;
2560 }
2561 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2562 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2563 julong long_ReservedCodeCacheSize = 0;
2564
2565 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2566 if (errcode != arg_in_range) {
2567 jio_fprintf(defaultStream::error_stream(),
2568 "Invalid maximum code cache size: %s.\n", option->optionString);
2569 return JNI_EINVAL;
2570 }
2571 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2572 return JNI_EINVAL;
2573 }
2574 // -green
2575 } else if (match_option(option, "-green")) {
2576 jio_fprintf(defaultStream::error_stream(),
2577 "Green threads support not available\n");
2578 return JNI_EINVAL;
2579 // -native
2580 } else if (match_option(option, "-native")) {
2581 // HotSpot always uses native threads, ignore silently for compatibility
2582 // -Xrs
2583 } else if (match_option(option, "-Xrs")) {
2584 // Classic/EVM option, new functionality
2585 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2586 return JNI_EINVAL;
2587 }
2588 // -Xprof
2589 } else if (match_option(option, "-Xprof")) {
2590 char version[256];
2591 // Obsolete in JDK 10
2592 JDK_Version::jdk(10).to_string(version, sizeof(version));
2593 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2594 // -Xinternalversion
2595 } else if (match_option(option, "-Xinternalversion")) {
2596 jio_fprintf(defaultStream::output_stream(), "%s\n",
2597 VM_Version::internal_vm_info_string());
2598 vm_exit(0);
2599 #ifndef PRODUCT
2600 // -Xprintflags
2601 } else if (match_option(option, "-Xprintflags")) {
2602 JVMFlag::printFlags(tty, false);
2603 vm_exit(0);
2604 #endif
2605 // -D
2606 } else if (match_option(option, "-D", &tail)) {
2607 const char* value;
2608 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2609 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2610 // abort if -Djava.endorsed.dirs is set
2611 jio_fprintf(defaultStream::output_stream(),
2612 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2613 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2614 return JNI_EINVAL;
2615 }
2616 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2617 *value != '\0' && strcmp(value, "\"\"") != 0) {
2618 // abort if -Djava.ext.dirs is set
2619 jio_fprintf(defaultStream::output_stream(),
2620 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2621 return JNI_EINVAL;
2622 }
2623 // Check for module related properties. They must be set using the modules
2624 // options. For example: use "--add-modules=java.sql", not
2625 // "-Djdk.module.addmods=java.sql"
2626 if (is_internal_module_property(option->optionString + 2)) {
2627 needs_module_property_warning = true;
2628 continue;
2629 }
2630 if (!add_property(tail)) {
2631 return JNI_ENOMEM;
2632 }
2633 // Out of the box management support
2634 if (match_option(option, "-Dcom.sun.management", &tail)) {
2635 #if INCLUDE_MANAGEMENT
2636 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2637 return JNI_EINVAL;
2638 }
2639 // management agent in module jdk.management.agent
2640 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2641 return JNI_ENOMEM;
2642 }
2643 #else
2644 jio_fprintf(defaultStream::output_stream(),
2645 "-Dcom.sun.management is not supported in this VM.\n");
2646 return JNI_ERR;
2647 #endif
2648 }
2649 // -Xint
2650 } else if (match_option(option, "-Xint")) {
2651 set_mode_flags(_int);
2652 mode_flag_cmd_line = true;
2653 // -Xmixed
2654 } else if (match_option(option, "-Xmixed")) {
2655 set_mode_flags(_mixed);
2656 mode_flag_cmd_line = true;
2657 // -Xcomp
2658 } else if (match_option(option, "-Xcomp")) {
2659 // for testing the compiler; turn off all flags that inhibit compilation
2660 set_mode_flags(_comp);
2661 mode_flag_cmd_line = true;
2662 // -Xshare:dump
2663 } else if (match_option(option, "-Xshare:dump")) {
2664 CDSConfig::enable_dumping_static_archive();
2665 CDSConfig::set_old_cds_flags_used();
2666 // -Xshare:on
2667 } else if (match_option(option, "-Xshare:on")) {
2668 UseSharedSpaces = true;
2669 RequireSharedSpaces = true;
2670 CDSConfig::set_old_cds_flags_used();
2671 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2672 } else if (match_option(option, "-Xshare:auto")) {
2673 UseSharedSpaces = true;
2674 RequireSharedSpaces = false;
2675 xshare_auto_cmd_line = true;
2676 CDSConfig::set_old_cds_flags_used();
2677 // -Xshare:off
2678 } else if (match_option(option, "-Xshare:off")) {
2679 UseSharedSpaces = false;
2680 RequireSharedSpaces = false;
2681 CDSConfig::set_old_cds_flags_used();
2682 // -Xverify
2683 } else if (match_option(option, "-Xverify", &tail)) {
2684 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2685 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2689 return JNI_EINVAL;
2690 }
2691 } else if (strcmp(tail, ":remote") == 0) {
2692 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 } else if (strcmp(tail, ":none") == 0) {
2699 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2700 return JNI_EINVAL;
2701 }
2702 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2703 return JNI_EINVAL;
2704 }
2705 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2706 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2707 return JNI_EINVAL;
2708 }
2709 // -Xdebug
2710 } else if (match_option(option, "-Xdebug")) {
2711 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2712 } else if (match_option(option, "-Xloggc:", &tail)) {
2713 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2714 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2715 _legacyGCLogging.lastFlag = 2;
2716 _legacyGCLogging.file = os::strdup_check_oom(tail);
2717 } else if (match_option(option, "-Xlog", &tail)) {
2718 bool ret = false;
2719 if (strcmp(tail, ":help") == 0) {
2720 fileStream stream(defaultStream::output_stream());
2721 LogConfiguration::print_command_line_help(&stream);
2722 vm_exit(0);
2723 } else if (strcmp(tail, ":disable") == 0) {
2724 LogConfiguration::disable_logging();
2725 ret = true;
2726 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2727 const char* async_tail = tail + strlen(":async");
2728 ret = LogConfiguration::parse_async_argument(async_tail);
2729 } else if (*tail == '\0') {
2730 ret = LogConfiguration::parse_command_line_arguments();
2731 assert(ret, "-Xlog without arguments should never fail to parse");
2732 } else if (*tail == ':') {
2733 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2734 }
2735 if (ret == false) {
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2738 tail);
2739 return JNI_EINVAL;
2740 }
2741 // JNI hooks
2742 } else if (match_option(option, "-Xcheck", &tail)) {
2743 if (!strcmp(tail, ":jni")) {
2744 #if !INCLUDE_JNI_CHECK
2745 warning("JNI CHECKING is not supported in this VM");
2746 #else
2747 CheckJNICalls = true;
2748 #endif // INCLUDE_JNI_CHECK
2749 } else if (is_bad_option(option, args->ignoreUnrecognized,
2750 "check")) {
2751 return JNI_EINVAL;
2752 }
2753 } else if (match_option(option, "vfprintf")) {
2754 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2755 } else if (match_option(option, "exit")) {
2756 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2757 } else if (match_option(option, "abort")) {
2758 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2759 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2760 // and the last option wins.
2761 } else if (match_option(option, "-XX:+NeverTenure")) {
2762 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2766 return JNI_EINVAL;
2767 }
2768 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2769 return JNI_EINVAL;
2770 }
2771 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2772 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2773 return JNI_EINVAL;
2774 }
2775 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2779 return JNI_EINVAL;
2780 }
2781 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2782 uint max_tenuring_thresh = 0;
2783 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2784 jio_fprintf(defaultStream::error_stream(),
2785 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2786 return JNI_EINVAL;
2787 }
2788
2789 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2790 return JNI_EINVAL;
2791 }
2792
2793 if (MaxTenuringThreshold == 0) {
2794 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2795 return JNI_EINVAL;
2796 }
2797 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 } else {
2801 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2802 return JNI_EINVAL;
2803 }
2804 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2805 return JNI_EINVAL;
2806 }
2807 }
2808 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2809 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2816 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2817 return JNI_EINVAL;
2818 }
2819 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2820 return JNI_EINVAL;
2821 }
2822 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2823 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2824 return JNI_EINVAL;
2825 }
2826 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2827 return JNI_EINVAL;
2828 }
2829 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2830 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2831 return JNI_EINVAL;
2832 }
2833 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2834 return JNI_EINVAL;
2835 }
2836 } else if (match_option(option, "--finalization=", &tail)) {
2837 if (strcmp(tail, "enabled") == 0) {
2838 InstanceKlass::set_finalization_enabled(true);
2839 } else if (strcmp(tail, "disabled") == 0) {
2840 InstanceKlass::set_finalization_enabled(false);
2841 } else {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2844 tail);
2845 return JNI_EINVAL;
2846 }
2847 #if !defined(DTRACE_ENABLED)
2848 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2849 jio_fprintf(defaultStream::error_stream(),
2850 "DTraceMethodProbes flag is not applicable for this configuration\n");
2851 return JNI_EINVAL;
2852 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2853 jio_fprintf(defaultStream::error_stream(),
2854 "DTraceAllocProbes flag is not applicable for this configuration\n");
2855 return JNI_EINVAL;
2856 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2857 jio_fprintf(defaultStream::error_stream(),
2858 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2859 return JNI_EINVAL;
2860 #endif // !defined(DTRACE_ENABLED)
2861 #ifdef ASSERT
2862 } else if (match_option(option, "-XX:+FullGCALot")) {
2863 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 #endif
2867 #if !INCLUDE_MANAGEMENT
2868 } else if (match_option(option, "-XX:+ManagementServer")) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "ManagementServer is not supported in this VM.\n");
2871 return JNI_ERR;
2872 #endif // INCLUDE_MANAGEMENT
2873 #if INCLUDE_JVMCI
2874 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2875 if (EnableJVMCIProduct) {
2876 jio_fprintf(defaultStream::error_stream(),
2877 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2878 return JNI_EINVAL;
2879 }
2880 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2881 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2882 if (use_graal_jit) {
2883 const char* jvmci_compiler = get_property("jvmci.Compiler");
2884 if (jvmci_compiler != nullptr) {
2885 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2886 jio_fprintf(defaultStream::error_stream(),
2887 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2888 return JNI_ERR;
2889 }
2890 } else if (!add_property("jvmci.Compiler=graal")) {
2891 return JNI_ENOMEM;
2892 }
2893 }
2894
2895 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2896 if (EnableJVMCIProduct) {
2897 continue;
2898 }
2899 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2900 // Allow this flag if it has been unlocked.
2901 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2902 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2903 jio_fprintf(defaultStream::error_stream(),
2904 "Unable to enable JVMCI in product mode\n");
2905 return JNI_ERR;
2906 }
2907 }
2908 // The flag was locked so process normally to report that error
2909 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2910 return JNI_EINVAL;
2911 }
2912 #endif // INCLUDE_JVMCI
2913 #if INCLUDE_JFR
2914 } else if (match_jfr_option(&option)) {
2915 return JNI_EINVAL;
2916 #endif
2917 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2918 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2919 // already been handled
2920 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2921 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2922 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2923 return JNI_EINVAL;
2924 }
2925 }
2926 // Unknown option
2927 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2928 return JNI_ERR;
2929 }
2930 }
2931
2932 // PrintSharedArchiveAndExit will turn on
2933 // -Xshare:on
2934 // -Xlog:class+path=info
2935 if (PrintSharedArchiveAndExit) {
2936 UseSharedSpaces = true;
2937 RequireSharedSpaces = true;
2938 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2939 }
2940
2941 fix_appclasspath();
2942
2943 return JNI_OK;
2944 }
2945
2946 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2947 if (!allow_cds) {
2948 CDSConfig::set_module_patching_disables_cds();
2949 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2950 CDSConfig::set_java_base_module_patching_disables_cds();
2951 }
2952 }
2953
2954 // Create GrowableArray lazily, only if --patch-module has been specified
2955 if (_patch_mod_prefix == nullptr) {
2956 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2957 }
2958
2959 // Scan patches for matching module
2960 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2961 return (strcmp(module_name, patch->module_name()) == 0);
2962 });
2963 if (i == -1) {
2964 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2965 } else {
2966 if (allow_append) {
2967 // append path to existing module entry
2968 _patch_mod_prefix->at(i)->append_path(path);
2969 } else {
2970 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2971 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2972 } else {
2973 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2974 }
2975 }
2976 }
2977 }
2978
2979 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2980 //
2981 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2982 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2983 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2984 // path is treated as the current directory.
2985 //
2986 // This causes problems with CDS, which requires that all directories specified in the classpath
2987 // must be empty. In most cases, applications do NOT want to load classes from the current
2988 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2989 // scripts compatible with CDS.
2990 void Arguments::fix_appclasspath() {
2991 if (IgnoreEmptyClassPaths) {
2992 const char separator = *os::path_separator();
2993 const char* src = _java_class_path->value();
2994
2995 // skip over all the leading empty paths
2996 while (*src == separator) {
2997 src ++;
2998 }
2999
3000 char* copy = os::strdup_check_oom(src, mtArguments);
3001
3002 // trim all trailing empty paths
3003 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3004 *tail = '\0';
3005 }
3006
3007 char from[3] = {separator, separator, '\0'};
3008 char to [2] = {separator, '\0'};
3009 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3010 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3011 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3012 }
3013
3014 _java_class_path->set_writeable_value(copy);
3015 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3016 }
3017 }
3018
3019 jint Arguments::finalize_vm_init_args() {
3020 // check if the default lib/endorsed directory exists; if so, error
3021 char path[JVM_MAXPATHLEN];
3022 const char* fileSep = os::file_separator();
3023 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3024
3025 DIR* dir = os::opendir(path);
3026 if (dir != nullptr) {
3027 jio_fprintf(defaultStream::output_stream(),
3028 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3029 "in modular form will be supported via the concept of upgradeable modules.\n");
3030 os::closedir(dir);
3031 return JNI_ERR;
3032 }
3033
3034 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3035 dir = os::opendir(path);
3036 if (dir != nullptr) {
3037 jio_fprintf(defaultStream::output_stream(),
3038 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3039 "Use -classpath instead.\n.");
3040 os::closedir(dir);
3041 return JNI_ERR;
3042 }
3043
3044 // This must be done after all arguments have been processed
3045 // and the container support has been initialized since AggressiveHeap
3046 // relies on the amount of total memory available.
3047 if (AggressiveHeap) {
3048 jint result = set_aggressive_heap_flags();
3049 if (result != JNI_OK) {
3050 return result;
3051 }
3052 }
3053
3054 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3055 // but like -Xint, leave compilation thresholds unaffected.
3056 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3057 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3058 set_mode_flags(_int);
3059 }
3060
3061 #ifdef ZERO
3062 // Zero always runs in interpreted mode
3063 set_mode_flags(_int);
3064 #endif
3065
3066 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3067 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3068 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3069 }
3070
3071 #if !COMPILER2_OR_JVMCI
3072 // Don't degrade server performance for footprint
3073 if (FLAG_IS_DEFAULT(UseLargePages) &&
3074 MaxHeapSize < LargePageHeapSizeThreshold) {
3075 // No need for large granularity pages w/small heaps.
3076 // Note that large pages are enabled/disabled for both the
3077 // Java heap and the code cache.
3078 FLAG_SET_DEFAULT(UseLargePages, false);
3079 }
3080
3081 UNSUPPORTED_OPTION(ProfileInterpreter);
3082 #endif
3083
3084 // Parse the CompilationMode flag
3085 if (!CompilationModeFlag::initialize()) {
3086 return JNI_ERR;
3087 }
3088
3089 // finalize --module-patch and related --enable-preview
3090 if (finalize_patch_module() != JNI_OK) {
3091 return JNI_ERR;
3092 }
3093
3094 if (!check_vm_args_consistency()) {
3095 return JNI_ERR;
3096 }
3097
3098 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3099 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3100 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3101
3102 return JNI_OK;
3103 }
3104
3105 // Helper class for controlling the lifetime of JavaVMInitArgs
3106 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3107 // deleted on the destruction of the ScopedVMInitArgs object.
3108 class ScopedVMInitArgs : public StackObj {
3109 private:
3110 JavaVMInitArgs _args;
3111 char* _container_name;
3112 bool _is_set;
3113 char* _vm_options_file_arg;
3114
3115 public:
3116 ScopedVMInitArgs(const char *container_name) {
3117 _args.version = JNI_VERSION_1_2;
3118 _args.nOptions = 0;
3119 _args.options = nullptr;
3120 _args.ignoreUnrecognized = false;
3121 _container_name = (char *)container_name;
3122 _is_set = false;
3123 _vm_options_file_arg = nullptr;
3124 }
3125
3126 // Populates the JavaVMInitArgs object represented by this
3127 // ScopedVMInitArgs object with the arguments in options. The
3128 // allocated memory is deleted by the destructor. If this method
3129 // returns anything other than JNI_OK, then this object is in a
3130 // partially constructed state, and should be abandoned.
3131 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3132 _is_set = true;
3133 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3134 JavaVMOption, options->length(), mtArguments);
3135 if (options_arr == nullptr) {
3136 return JNI_ENOMEM;
3137 }
3138 _args.options = options_arr;
3139
3140 for (int i = 0; i < options->length(); i++) {
3141 options_arr[i] = options->at(i);
3142 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3143 if (options_arr[i].optionString == nullptr) {
3144 // Rely on the destructor to do cleanup.
3145 _args.nOptions = i;
3146 return JNI_ENOMEM;
3147 }
3148 }
3149
3150 _args.nOptions = options->length();
3151 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3152 return JNI_OK;
3153 }
3154
3155 JavaVMInitArgs* get() { return &_args; }
3156 char* container_name() { return _container_name; }
3157 bool is_set() { return _is_set; }
3158 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3159 char* vm_options_file_arg() { return _vm_options_file_arg; }
3160
3161 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3162 if (_vm_options_file_arg != nullptr) {
3163 os::free(_vm_options_file_arg);
3164 }
3165 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3166 }
3167
3168 ~ScopedVMInitArgs() {
3169 if (_vm_options_file_arg != nullptr) {
3170 os::free(_vm_options_file_arg);
3171 }
3172 if (_args.options == nullptr) return;
3173 for (int i = 0; i < _args.nOptions; i++) {
3174 os::free(_args.options[i].optionString);
3175 }
3176 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3177 }
3178
3179 // Insert options into this option list, to replace option at
3180 // vm_options_file_pos (-XX:VMOptionsFile)
3181 jint insert(const JavaVMInitArgs* args,
3182 const JavaVMInitArgs* args_to_insert,
3183 const int vm_options_file_pos) {
3184 assert(_args.options == nullptr, "shouldn't be set yet");
3185 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3186 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3187
3188 int length = args->nOptions + args_to_insert->nOptions - 1;
3189 // Construct new option array
3190 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3191 for (int i = 0; i < args->nOptions; i++) {
3192 if (i == vm_options_file_pos) {
3193 // insert the new options starting at the same place as the
3194 // -XX:VMOptionsFile option
3195 for (int j = 0; j < args_to_insert->nOptions; j++) {
3196 options.push(args_to_insert->options[j]);
3197 }
3198 } else {
3199 options.push(args->options[i]);
3200 }
3201 }
3202 // make into options array
3203 return set_args(&options);
3204 }
3205 };
3206
3207 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3208 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3209 }
3210
3211 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3212 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3213 }
3214
3215 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3216 for (int index = args->nOptions - 1; index >= 0; index--) {
3217 JavaVMOption* option = args->options + index;
3218 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3219 return option;
3220 }
3221 }
3222
3223 return nullptr;
3224 }
3225
3226 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3227 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3228 // Don't bother scanning all the args if this env variable is not set
3229 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3230 return JNI_OK;
3231 }
3232
3233 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3234 // of AOTMode.
3235 JavaVMOption* option = nullptr;
3236 for (int i = all_args->length() - 1; i >= 0; i--) {
3237 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3238 break;
3239 }
3240 }
3241
3242 if (option != nullptr) {
3243 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3244 // so its value is not reflected inside the global variable AOTMode.
3245 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3246 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3247 }
3248 } else {
3249 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3250 // which would have been set inside process_settings_file();
3251 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3252 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3253 }
3254 }
3255
3256 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3257 }
3258
3259 jint Arguments::parse_options_environment_variable(const char* name,
3260 ScopedVMInitArgs* vm_args) {
3261 char *buffer = ::getenv(name);
3262
3263 // Don't check this environment variable if user has special privileges
3264 // (e.g. unix su command).
3265 if (buffer == nullptr || os::have_special_privileges()) {
3266 return JNI_OK;
3267 }
3268
3269 if ((buffer = os::strdup(buffer)) == nullptr) {
3270 return JNI_ENOMEM;
3271 }
3272
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Picked up %s: %s\n", name, buffer);
3275
3276 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3277
3278 os::free(buffer);
3279 return retcode;
3280 }
3281
3282 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3283 // read file into buffer
3284 int fd = ::open(file_name, O_RDONLY);
3285 if (fd < 0) {
3286 jio_fprintf(defaultStream::error_stream(),
3287 "Could not open options file '%s'\n",
3288 file_name);
3289 return JNI_ERR;
3290 }
3291
3292 struct stat stbuf;
3293 int retcode = os::stat(file_name, &stbuf);
3294 if (retcode != 0) {
3295 jio_fprintf(defaultStream::error_stream(),
3296 "Could not stat options file '%s'\n",
3297 file_name);
3298 ::close(fd);
3299 return JNI_ERR;
3300 }
3301
3302 if (stbuf.st_size == 0) {
3303 // tell caller there is no option data and that is ok
3304 ::close(fd);
3305 return JNI_OK;
3306 }
3307
3308 // '+ 1' for null termination even with max bytes
3309 size_t bytes_alloc = stbuf.st_size + 1;
3310
3311 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3312 if (nullptr == buf) {
3313 jio_fprintf(defaultStream::error_stream(),
3314 "Could not allocate read buffer for options file parse\n");
3315 ::close(fd);
3316 return JNI_ENOMEM;
3317 }
3318
3319 memset(buf, 0, bytes_alloc);
3320
3321 // Fill buffer
3322 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3323 ::close(fd);
3324 if (bytes_read < 0) {
3325 FREE_C_HEAP_ARRAY(char, buf);
3326 jio_fprintf(defaultStream::error_stream(),
3327 "Could not read options file '%s'\n", file_name);
3328 return JNI_ERR;
3329 }
3330
3331 if (bytes_read == 0) {
3332 // tell caller there is no option data and that is ok
3333 FREE_C_HEAP_ARRAY(char, buf);
3334 return JNI_OK;
3335 }
3336
3337 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3338
3339 FREE_C_HEAP_ARRAY(char, buf);
3340 return retcode;
3341 }
3342
3343 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3344 // Construct option array
3345 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3346
3347 // some pointers to help with parsing
3348 char *buffer_end = buffer + buf_len;
3349 char *opt_hd = buffer;
3350 char *wrt = buffer;
3351 char *rd = buffer;
3352
3353 // parse all options
3354 while (rd < buffer_end) {
3355 // skip leading white space from the input string
3356 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3357 rd++;
3358 }
3359
3360 if (rd >= buffer_end) {
3361 break;
3362 }
3363
3364 // Remember this is where we found the head of the token.
3365 opt_hd = wrt;
3366
3367 // Tokens are strings of non white space characters separated
3368 // by one or more white spaces.
3369 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3370 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3371 int quote = *rd; // matching quote to look for
3372 rd++; // don't copy open quote
3373 while (rd < buffer_end && *rd != quote) {
3374 // include everything (even spaces)
3375 // up until the close quote
3376 *wrt++ = *rd++; // copy to option string
3377 }
3378
3379 if (rd < buffer_end) {
3380 rd++; // don't copy close quote
3381 } else {
3382 // did not see closing quote
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Unmatched quote in %s\n", name);
3385 return JNI_ERR;
3386 }
3387 } else {
3388 *wrt++ = *rd++; // copy to option string
3389 }
3390 }
3391
3392 // steal a white space character and set it to null
3393 *wrt++ = '\0';
3394 // We now have a complete token
3395
3396 JavaVMOption option;
3397 option.optionString = opt_hd;
3398 option.extraInfo = nullptr;
3399
3400 options.append(option); // Fill in option
3401
3402 rd++; // Advance to next character
3403 }
3404
3405 // Fill out JavaVMInitArgs structure.
3406 return vm_args->set_args(&options);
3407 }
3408
3409 #ifndef PRODUCT
3410 // Determine whether LogVMOutput should be implicitly turned on.
3411 static bool use_vm_log() {
3412 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3413 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3414 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3415 PrintAssembly || TraceDeoptimization ||
3416 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3417 return true;
3418 }
3419
3420 #ifdef COMPILER1
3421 if (PrintC1Statistics) {
3422 return true;
3423 }
3424 #endif // COMPILER1
3425
3426 #ifdef COMPILER2
3427 if (PrintOptoAssembly || PrintOptoStatistics) {
3428 return true;
3429 }
3430 #endif // COMPILER2
3431
3432 return false;
3433 }
3434
3435 #endif // PRODUCT
3436
3437 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3438 for (int index = 0; index < args->nOptions; index++) {
3439 const JavaVMOption* option = args->options + index;
3440 const char* tail;
3441 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3442 return true;
3443 }
3444 }
3445 return false;
3446 }
3447
3448 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3449 const char* vm_options_file,
3450 const int vm_options_file_pos,
3451 ScopedVMInitArgs* vm_options_file_args,
3452 ScopedVMInitArgs* args_out) {
3453 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3454 if (code != JNI_OK) {
3455 return code;
3456 }
3457
3458 if (vm_options_file_args->get()->nOptions < 1) {
3459 return JNI_OK;
3460 }
3461
3462 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3463 jio_fprintf(defaultStream::error_stream(),
3464 "A VM options file may not refer to a VM options file. "
3465 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3466 "options file '%s' in options container '%s' is an error.\n",
3467 vm_options_file_args->vm_options_file_arg(),
3468 vm_options_file_args->container_name());
3469 return JNI_EINVAL;
3470 }
3471
3472 return args_out->insert(args, vm_options_file_args->get(),
3473 vm_options_file_pos);
3474 }
3475
3476 // Expand -XX:VMOptionsFile found in args_in as needed.
3477 // mod_args and args_out parameters may return values as needed.
3478 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3479 ScopedVMInitArgs* mod_args,
3480 JavaVMInitArgs** args_out) {
3481 jint code = match_special_option_and_act(args_in, mod_args);
3482 if (code != JNI_OK) {
3483 return code;
3484 }
3485
3486 if (mod_args->is_set()) {
3487 // args_in contains -XX:VMOptionsFile and mod_args contains the
3488 // original options from args_in along with the options expanded
3489 // from the VMOptionsFile. Return a short-hand to the caller.
3490 *args_out = mod_args->get();
3491 } else {
3492 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3493 }
3494 return JNI_OK;
3495 }
3496
3497 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3498 ScopedVMInitArgs* args_out) {
3499 // Remaining part of option string
3500 const char* tail;
3501 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3502
3503 for (int index = 0; index < args->nOptions; index++) {
3504 const JavaVMOption* option = args->options + index;
3505 if (match_option(option, "-XX:Flags=", &tail)) {
3506 Arguments::set_jvm_flags_file(tail);
3507 continue;
3508 }
3509 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3510 if (vm_options_file_args.found_vm_options_file_arg()) {
3511 jio_fprintf(defaultStream::error_stream(),
3512 "The option '%s' is already specified in the options "
3513 "container '%s' so the specification of '%s' in the "
3514 "same options container is an error.\n",
3515 vm_options_file_args.vm_options_file_arg(),
3516 vm_options_file_args.container_name(),
3517 option->optionString);
3518 return JNI_EINVAL;
3519 }
3520 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3521 // If there's a VMOptionsFile, parse that
3522 jint code = insert_vm_options_file(args, tail, index,
3523 &vm_options_file_args, args_out);
3524 if (code != JNI_OK) {
3525 return code;
3526 }
3527 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3528 if (args_out->is_set()) {
3529 // The VMOptions file inserted some options so switch 'args'
3530 // to the new set of options, and continue processing which
3531 // preserves "last option wins" semantics.
3532 args = args_out->get();
3533 // The first option from the VMOptionsFile replaces the
3534 // current option. So we back track to process the
3535 // replacement option.
3536 index--;
3537 }
3538 continue;
3539 }
3540 if (match_option(option, "-XX:+PrintVMOptions")) {
3541 PrintVMOptions = true;
3542 continue;
3543 }
3544 if (match_option(option, "-XX:-PrintVMOptions")) {
3545 PrintVMOptions = false;
3546 continue;
3547 }
3548 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3549 IgnoreUnrecognizedVMOptions = true;
3550 continue;
3551 }
3552 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3553 IgnoreUnrecognizedVMOptions = false;
3554 continue;
3555 }
3556 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3557 JVMFlag::printFlags(tty, false);
3558 vm_exit(0);
3559 }
3560
3561 #ifndef PRODUCT
3562 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3563 JVMFlag::printFlags(tty, true);
3564 vm_exit(0);
3565 }
3566 #endif
3567 }
3568 return JNI_OK;
3569 }
3570
3571 static void print_options(const JavaVMInitArgs *args) {
3572 const char* tail;
3573 for (int index = 0; index < args->nOptions; index++) {
3574 const JavaVMOption *option = args->options + index;
3575 if (match_option(option, "-XX:", &tail)) {
3576 logOption(tail);
3577 }
3578 }
3579 }
3580
3581 bool Arguments::handle_deprecated_print_gc_flags() {
3582 if (PrintGC) {
3583 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3584 }
3585 if (PrintGCDetails) {
3586 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3587 }
3588
3589 if (_legacyGCLogging.lastFlag == 2) {
3590 // -Xloggc was used to specify a filename
3591 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3592
3593 LogTarget(Error, logging) target;
3594 LogStream errstream(target);
3595 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3596 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3597 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3598 }
3599 return true;
3600 }
3601
3602 static void apply_debugger_ergo() {
3603 #ifdef ASSERT
3604 if (ReplayCompiles) {
3605 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3606 }
3607
3608 if (UseDebuggerErgo) {
3609 // Turn on sub-flags
3610 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3611 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3612 }
3613
3614 if (UseDebuggerErgo2) {
3615 // Debugging with limited number of CPUs
3616 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3617 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3618 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3619 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3620 }
3621 #endif // ASSERT
3622 }
3623
3624 // Parse entry point called from JNI_CreateJavaVM
3625
3626 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3627 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3628 JVMFlag::check_all_flag_declarations();
3629
3630 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3631 const char* hotspotrc = ".hotspotrc";
3632 bool settings_file_specified = false;
3633 bool needs_hotspotrc_warning = false;
3634 ScopedVMInitArgs initial_vm_options_args("");
3635 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3636 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3637 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3638
3639 // Pointers to current working set of containers
3640 JavaVMInitArgs* cur_cmd_args;
3641 JavaVMInitArgs* cur_vm_options_args;
3642 JavaVMInitArgs* cur_java_options_args;
3643 JavaVMInitArgs* cur_java_tool_options_args;
3644 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3645
3646 // Containers for modified/expanded options
3647 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3648 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3649 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3650 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3651 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3652
3653 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3654
3655 jint code =
3656 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3657 if (code != JNI_OK) {
3658 return code;
3659 }
3660
3661 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3662 // This is an undocumented feature.
3663 code = parse_java_options_environment_variable(&initial_java_options_args);
3664 if (code != JNI_OK) {
3665 return code;
3666 }
3667
3668 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3669 char *vmoptions = ClassLoader::lookup_vm_options();
3670 if (vmoptions != nullptr) {
3671 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3672 FREE_C_HEAP_ARRAY(char, vmoptions);
3673 if (code != JNI_OK) {
3674 return code;
3675 }
3676 }
3677
3678 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3679 &mod_java_tool_options_args,
3680 &cur_java_tool_options_args);
3681 if (code != JNI_OK) {
3682 return code;
3683 }
3684
3685 code = expand_vm_options_as_needed(initial_cmd_args,
3686 &mod_cmd_args,
3687 &cur_cmd_args);
3688 if (code != JNI_OK) {
3689 return code;
3690 }
3691
3692 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3693 &mod_java_options_args,
3694 &cur_java_options_args);
3695 if (code != JNI_OK) {
3696 return code;
3697 }
3698
3699 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3700 &mod_vm_options_args,
3701 &cur_vm_options_args);
3702 if (code != JNI_OK) {
3703 return code;
3704 }
3705
3706 const char* flags_file = Arguments::get_jvm_flags_file();
3707 settings_file_specified = (flags_file != nullptr);
3708
3709 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3710 if (settings_file_specified) {
3711 if (!process_settings_file(flags_file, true,
3712 IgnoreUnrecognizedVMOptions)) {
3713 return JNI_EINVAL;
3714 }
3715 } else {
3716 #ifdef ASSERT
3717 // Parse default .hotspotrc settings file
3718 if (!process_settings_file(".hotspotrc", false,
3719 IgnoreUnrecognizedVMOptions)) {
3720 return JNI_EINVAL;
3721 }
3722 #else
3723 struct stat buf;
3724 if (os::stat(hotspotrc, &buf) == 0) {
3725 needs_hotspotrc_warning = true;
3726 }
3727 #endif
3728 }
3729
3730 // The settings in the args are applied in this order to the the JVM global flags.
3731 // For historical reasons, the order is DIFFERENT than the scanning order of
3732 // the above expand_vm_options_as_needed() calls.
3733 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3734 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3735 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3736 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3737
3738 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3739 // the options that have been gathered above.
3740 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3741 if (code != JNI_OK) {
3742 return code;
3743 }
3744 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3745 &mod_jdk_aot_vm_options_args,
3746 &cur_jdk_aot_vm_options_args);
3747 if (code != JNI_OK) {
3748 return code;
3749 }
3750
3751 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3752 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3753 const char* optionString = option->optionString;
3754 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3755 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3756 jio_fprintf(defaultStream::error_stream(),
3757 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3758 return JNI_ERR;
3759 }
3760 }
3761
3762 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3763
3764 if (IgnoreUnrecognizedVMOptions) {
3765 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3766 // the JDK so it shouldn't have bad options.
3767 cur_cmd_args->ignoreUnrecognized = true;
3768 cur_java_tool_options_args->ignoreUnrecognized = true;
3769 cur_java_options_args->ignoreUnrecognized = true;
3770 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3771 }
3772
3773 if (PrintVMOptions) {
3774 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3775 print_options(cur_java_tool_options_args);
3776 print_options(cur_cmd_args);
3777 print_options(cur_java_options_args);
3778 print_options(cur_jdk_aot_vm_options_args);
3779 }
3780
3781 // Apply the settings in these args to the JVM global flags.
3782 jint result = parse_vm_init_args(&all_args);
3783
3784 if (result != JNI_OK) {
3785 return result;
3786 }
3787
3788 // Delay warning until here so that we've had a chance to process
3789 // the -XX:-PrintWarnings flag
3790 if (needs_hotspotrc_warning) {
3791 warning("%s file is present but has been ignored. "
3792 "Run with -XX:Flags=%s to load the file.",
3793 hotspotrc, hotspotrc);
3794 }
3795
3796 if (needs_module_property_warning) {
3797 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3798 " names that are reserved for internal use.");
3799 }
3800
3801 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3802 UNSUPPORTED_OPTION(UseLargePages);
3803 #endif
3804
3805 #if defined(AIX)
3806 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3807 #endif
3808
3809 #ifndef PRODUCT
3810 if (TraceBytecodesAt != 0) {
3811 TraceBytecodes = true;
3812 }
3813 #endif // PRODUCT
3814
3815 if (ScavengeRootsInCode == 0) {
3816 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3817 warning("Forcing ScavengeRootsInCode non-zero");
3818 }
3819 ScavengeRootsInCode = 1;
3820 }
3821
3822 if (!handle_deprecated_print_gc_flags()) {
3823 return JNI_EINVAL;
3824 }
3825
3826 // Set object alignment values.
3827 set_object_alignment();
3828
3829 #if !INCLUDE_CDS
3830 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3831 jio_fprintf(defaultStream::error_stream(),
3832 "Shared spaces are not supported in this VM\n");
3833 return JNI_ERR;
3834 }
3835 if (DumpLoadedClassList != nullptr) {
3836 jio_fprintf(defaultStream::error_stream(),
3837 "DumpLoadedClassList is not supported in this VM\n");
3838 return JNI_ERR;
3839 }
3840 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3841 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3842 warning("Shared spaces are not supported in this VM");
3843 UseSharedSpaces = false;
3844 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3845 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3846 }
3847 no_shared_spaces("CDS Disabled");
3848 #endif // INCLUDE_CDS
3849
3850 // Verify NMT arguments
3851 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3852 if (lvl == NMT_unknown) {
3853 jio_fprintf(defaultStream::error_stream(),
3854 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3855 return JNI_ERR;
3856 }
3857 if (PrintNMTStatistics && lvl == NMT_off) {
3858 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3859 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3860 }
3861
3862 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3863 if (trace_dependencies && VerifyDependencies) {
3864 warning("dependency logging results may be inflated by VerifyDependencies");
3865 }
3866
3867 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3868 log_is_enabled(Info, class, load, cause);
3869 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3870 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3871 }
3872
3873 apply_debugger_ergo();
3874
3875 // The VMThread needs to stop now and then to execute these debug options.
3876 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3877 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3878 }
3879
3880 if (log_is_enabled(Info, arguments)) {
3881 LogStream st(Log(arguments)::info());
3882 Arguments::print_on(&st);
3883 }
3884
3885 return JNI_OK;
3886 }
3887
3888 void Arguments::set_compact_headers_flags() {
3889 #ifdef _LP64
3890 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3891 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3892 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3893 }
3894 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3895 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3896 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3897 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3898
3899 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3900 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3901 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3902 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3903 } else {
3904 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3905 }
3906 }
3907 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3908 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3909 }
3910 #endif
3911 }
3912
3913 jint Arguments::apply_ergo() {
3914 // Set flags based on ergonomics.
3915 jint result = set_ergonomics_flags();
3916 if (result != JNI_OK) return result;
3917
3918 // Set heap size based on available physical memory
3919 set_heap_size();
3920
3921 GCConfig::arguments()->initialize();
3922
3923 set_compact_headers_flags();
3924
3925 if (UseCompressedClassPointers) {
3926 CompressedKlassPointers::pre_initialize();
3927 }
3928
3929 CDSConfig::ergo_initialize();
3930
3931 // Initialize Metaspace flags and alignments
3932 Metaspace::ergo_initialize();
3933
3934 if (!StringDedup::ergo_initialize()) {
3935 return JNI_EINVAL;
3936 }
3937
3938 // Set compiler flags after GC is selected and GC specific
3939 // flags (LoopStripMiningIter) are set.
3940 CompilerConfig::ergo_initialize();
3941
3942 // Set bytecode rewriting flags
3943 set_bytecode_flags();
3944
3945 // Set flags if aggressive optimization flags are enabled
3946 jint code = set_aggressive_opts_flags();
3947 if (code != JNI_OK) {
3948 return code;
3949 }
3950
3951 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3952 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3953 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3954 warning("UseSecondarySupersTable is not supported");
3955 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3956 }
3957 if (!UseSecondarySupersTable) {
3958 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3959 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3960 }
3961
3962 #ifdef ZERO
3963 // Clear flags not supported on zero.
3964 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3965 #endif // ZERO
3966
3967 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3968 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3969 DebugNonSafepoints = true;
3970 }
3971
3972 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3973 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3974 }
3975
3976 // Treat the odd case where local verification is enabled but remote
3977 // verification is not as if both were enabled.
3978 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3979 log_info(verification)("Turning on remote verification because local verification is on");
3980 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3981 }
3982 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3983 // Disable calling convention optimizations if inline types are not supported.
3984 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3985 // the CDS archive, as the values must match between dumptime and runtime.
3986 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3987 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3988 }
3989 if (!UseNonAtomicValueFlattening && !UseNullableValueFlattening && !UseAtomicValueFlattening) {
3990 // Flattening is disabled
3991 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3992 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3993 }
3994
3995 #ifndef PRODUCT
3996 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3997 if (use_vm_log()) {
3998 LogVMOutput = true;
3999 }
4000 }
4001 #endif // PRODUCT
4002
4003 if (PrintCommandLineFlags) {
4004 JVMFlag::printSetFlags(tty);
4005 }
4006
4007 #if COMPILER2_OR_JVMCI
4008 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4009 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4010 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4011 }
4012 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4013
4014 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4015 if (!EnableVectorReboxing) {
4016 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4017 } else {
4018 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4019 }
4020 }
4021 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4022 }
4023 #endif // COMPILER2_OR_JVMCI
4024
4025 #ifdef COMPILER2
4026 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
4027 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
4028 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
4029 }
4030 #endif // COMPILER2
4031
4032 if (log_is_enabled(Info, perf, class, link)) {
4033 if (!UsePerfData) {
4034 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
4035 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
4036 assert(!log_is_enabled(Info, perf, class, link), "sanity");
4037 }
4038 }
4039
4040 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4041 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4042 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4043 }
4044 }
4045 return JNI_OK;
4046 }
4047
4048 jint Arguments::adjust_after_os() {
4049 if (UseNUMA) {
4050 if (UseParallelGC) {
4051 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4052 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4053 }
4054 }
4055 }
4056 return JNI_OK;
4057 }
4058
4059 int Arguments::PropertyList_count(SystemProperty* pl) {
4060 int count = 0;
4061 while(pl != nullptr) {
4062 count++;
4063 pl = pl->next();
4064 }
4065 return count;
4066 }
4067
4068 // Return the number of readable properties.
4069 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4070 int count = 0;
4071 while(pl != nullptr) {
4072 if (pl->readable()) {
4073 count++;
4074 }
4075 pl = pl->next();
4076 }
4077 return count;
4078 }
4079
4080 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4081 assert(key != nullptr, "just checking");
4082 SystemProperty* prop;
4083 for (prop = pl; prop != nullptr; prop = prop->next()) {
4084 if (strcmp(key, prop->key()) == 0) return prop->value();
4085 }
4086 return nullptr;
4087 }
4088
4089 // Return the value of the requested property provided that it is a readable property.
4090 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4091 assert(key != nullptr, "just checking");
4092 SystemProperty* prop;
4093 // Return the property value if the keys match and the property is not internal or
4094 // it's the special internal property "jdk.boot.class.path.append".
4095 for (prop = pl; prop != nullptr; prop = prop->next()) {
4096 if (strcmp(key, prop->key()) == 0) {
4097 if (!prop->internal()) {
4098 return prop->value();
4099 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4100 return prop->value();
4101 } else {
4102 // Property is internal and not jdk.boot.class.path.append so return null.
4103 return nullptr;
4104 }
4105 }
4106 }
4107 return nullptr;
4108 }
4109
4110 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4111 SystemProperty* p = *plist;
4112 if (p == nullptr) {
4113 *plist = new_p;
4114 } else {
4115 while (p->next() != nullptr) {
4116 p = p->next();
4117 }
4118 p->set_next(new_p);
4119 }
4120 }
4121
4122 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4123 bool writeable, bool internal) {
4124 if (plist == nullptr)
4125 return;
4126
4127 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4128 PropertyList_add(plist, new_p);
4129 }
4130
4131 void Arguments::PropertyList_add(SystemProperty *element) {
4132 PropertyList_add(&_system_properties, element);
4133 }
4134
4135 // This add maintains unique property key in the list.
4136 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4137 PropertyAppendable append, PropertyWriteable writeable,
4138 PropertyInternal internal) {
4139 if (plist == nullptr)
4140 return;
4141
4142 // If property key exists and is writeable, then update with new value.
4143 // Trying to update a non-writeable property is silently ignored.
4144 SystemProperty* prop;
4145 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4146 if (strcmp(k, prop->key()) == 0) {
4147 if (append == AppendProperty) {
4148 prop->append_writeable_value(v);
4149 } else {
4150 prop->set_writeable_value(v);
4151 }
4152 return;
4153 }
4154 }
4155
4156 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4157 }
4158
4159 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4160 // Returns true if all of the source pointed by src has been copied over to
4161 // the destination buffer pointed by buf. Otherwise, returns false.
4162 // Notes:
4163 // 1. If the length (buflen) of the destination buffer excluding the
4164 // null terminator character is not long enough for holding the expanded
4165 // pid characters, it also returns false instead of returning the partially
4166 // expanded one.
4167 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4168 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4169 char* buf, size_t buflen) {
4170 const char* p = src;
4171 char* b = buf;
4172 const char* src_end = &src[srclen];
4173 char* buf_end = &buf[buflen - 1];
4174
4175 while (p < src_end && b < buf_end) {
4176 if (*p == '%') {
4177 switch (*(++p)) {
4178 case '%': // "%%" ==> "%"
4179 *b++ = *p++;
4180 break;
4181 case 'p': { // "%p" ==> current process id
4182 // buf_end points to the character before the last character so
4183 // that we could write '\0' to the end of the buffer.
4184 size_t buf_sz = buf_end - b + 1;
4185 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4186
4187 // if jio_snprintf fails or the buffer is not long enough to hold
4188 // the expanded pid, returns false.
4189 if (ret < 0 || ret >= (int)buf_sz) {
4190 return false;
4191 } else {
4192 b += ret;
4193 assert(*b == '\0', "fail in copy_expand_pid");
4194 if (p == src_end && b == buf_end + 1) {
4195 // reach the end of the buffer.
4196 return true;
4197 }
4198 }
4199 p++;
4200 break;
4201 }
4202 default :
4203 *b++ = '%';
4204 }
4205 } else {
4206 *b++ = *p++;
4207 }
4208 }
4209 *b = '\0';
4210 return (p == src_end); // return false if not all of the source was copied
4211 }