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