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
321 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
322 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
323 return ((strncmp(option, property, len) == 0) &&
324 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
325 }
326
327 // Return true if property starts with "jdk.module." and its ensuing chars match
328 // any of the reserved module properties.
329 // property should be passed without the leading "-D".
330 bool Arguments::is_internal_module_property(const char* property) {
331 return internal_module_property_helper(property, false);
332 }
333
334 // Returns true if property is one of those recognized by is_internal_module_property() but
335 // is not supported by CDS archived full module graph.
336 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
337 return internal_module_property_helper(property, true);
338 }
339
340 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
341 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
342 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
343 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
344 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
345 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
346 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
347 return true;
348 }
349
350 if (!check_for_cds) {
351 // CDS notes: these properties are supported by CDS archived full module graph.
352 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
353 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
354 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
355 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
356 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
357 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
358 return true;
359 }
360 }
361 }
362 return false;
363 }
364
365 // Process java launcher properties.
366 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
367 // See if sun.java.launcher is defined.
368 // Must do this before setting up other system properties,
369 // as some of them may depend on launcher type.
370 for (int index = 0; index < args->nOptions; index++) {
371 const JavaVMOption* option = args->options + index;
372 const char* tail;
373
374 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
375 process_java_launcher_argument(tail, option->extraInfo);
376 continue;
377 }
378 if (match_option(option, "-XX:+ExecutingUnitTests")) {
379 _executing_unit_tests = true;
380 continue;
381 }
382 }
383 }
384
385 // Initialize system properties key and value.
386 void Arguments::init_system_properties() {
387
388 // Set up _boot_class_path which is not a property but
389 // relies heavily on argument processing and the jdk.boot.class.path.append
390 // property. It is used to store the underlying boot class path.
391 _boot_class_path = new PathString(nullptr);
392
393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
394 "Java Virtual Machine Specification", false));
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
397 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
398
399 // Initialize the vm.info now, but it will need updating after argument parsing.
400 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
401
402 // Following are JVMTI agent writable properties.
403 // Properties values are set to nullptr and they are
404 // os specific they are initialized in os::init_system_properties_values().
405 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
406 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
407 _java_home = new SystemProperty("java.home", nullptr, true);
408 _java_class_path = new SystemProperty("java.class.path", "", true);
409 // jdk.boot.class.path.append is a non-writeable, internal property.
410 // It can only be set by either:
411 // - -Xbootclasspath/a:
412 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
413 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
414
415 // Add to System Property list.
416 PropertyList_add(&_system_properties, _sun_boot_library_path);
417 PropertyList_add(&_system_properties, _java_library_path);
418 PropertyList_add(&_system_properties, _java_home);
419 PropertyList_add(&_system_properties, _java_class_path);
420 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
421 PropertyList_add(&_system_properties, _vm_info);
422
423 // Set OS specific system properties values
424 os::init_system_properties_values();
425 }
426
427 // Update/Initialize System properties after JDK version number is known
428 void Arguments::init_version_specific_system_properties() {
429 enum { bufsz = 16 };
430 char buffer[bufsz];
431 const char* spec_vendor = "Oracle Corporation";
432 uint32_t spec_version = JDK_Version::current().major_version();
433
434 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
435
436 PropertyList_add(&_system_properties,
437 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.version", buffer, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
442 }
443
444 /*
445 * -XX argument processing:
446 *
447 * -XX arguments are defined in several places, such as:
448 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
449 * -XX arguments are parsed in parse_argument().
450 * -XX argument bounds checking is done in check_vm_args_consistency().
451 *
452 * Over time -XX arguments may change. There are mechanisms to handle common cases:
453 *
454 * ALIASED: An option that is simply another name for another option. This is often
455 * part of the process of deprecating a flag, but not all aliases need
456 * to be deprecated.
457 *
458 * Create an alias for an option by adding the old and new option names to the
459 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
460 *
461 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
462 * support may be removed in the future. Both regular and aliased options may be
463 * deprecated.
464 *
465 * Add a deprecation warning for an option (or alias) by adding an entry in the
466 * "special_jvm_flags" table and setting the "deprecated_in" field.
467 * Often an option "deprecated" in one major release will
468 * be made "obsolete" in the next. In this case the entry should also have its
469 * "obsolete_in" field set.
470 *
471 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
472 * on the command line. A warning is printed to let the user know that option might not
473 * be accepted in the future.
474 *
475 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
476 * table and setting the "obsolete_in" field.
477 *
478 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
479 * to the current JDK version. The system will flatly refuse to admit the existence of
480 * the flag. This allows a flag to die automatically over JDK releases.
481 *
482 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
483 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
484 * - Newly obsolete or expired deprecated options should have their global variable
485 * definitions removed (from globals.hpp, etc) and related implementations removed.
486 *
487 * Recommended approach for removing options:
488 *
489 * To remove options commonly used by customers (e.g. product -XX options), use
490 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
491 *
492 * To remove internal options (e.g. diagnostic, experimental, develop options), use
493 * a 2-step model adding major release numbers to the obsolete and expire columns.
494 *
495 * To change the name of an option, use the alias table as well as a 2-step
496 * model adding major release numbers to the deprecate and expire columns.
497 * Think twice about aliasing commonly used customer options.
498 *
499 * There are times when it is appropriate to leave a future release number as undefined.
500 *
501 * Tests: Aliases should be tested in VMAliasOptions.java.
502 * Deprecated options should be tested in VMDeprecatedOptions.java.
503 */
504
505 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
506 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
507 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
508 // the command-line as usual, but will issue a warning.
509 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
510 // the command-line, while issuing a warning and ignoring the flag value.
511 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
512 // existence of the flag.
513 //
514 // MANUAL CLEANUP ON JDK VERSION UPDATES:
515 // This table ensures that the handling of options will update automatically when the JDK
516 // version is incremented, but the source code needs to be cleanup up manually:
517 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
518 // variable should be removed, as well as users of the variable.
519 // - As "deprecated" options age into "obsolete" options, move the entry into the
520 // "Obsolete Flags" section of the table.
521 // - All expired options should be removed from the table.
522 static SpecialFlag const special_jvm_flags[] = {
523 // -------------- Deprecated Flags --------------
524 // --- Non-alias flags - sorted by obsolete_in then expired_in:
525 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
528 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
529 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
530 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
531 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
532 #ifdef _LP64
533 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
534 #endif
535 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
536 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
537 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
538 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
539 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
540 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
541
542 // -------------- Obsolete Flags - sorted by expired_in --------------
543
544 #ifdef LINUX
545 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
546 #endif
547 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
548 { "G1UpdateBufferSize", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
549 { "ShenandoahPacing", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
550 #if defined(AARCH64)
551 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
552 #endif
553
554 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
555 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
556 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
557 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
558 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
559 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
560 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
561 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
562 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
563 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
564 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
565 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
566 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
567 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
568 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
569 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
570
571 { "PretenureSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
572 { "HeapMaximumCompactionInterval",JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
573
574 #ifdef ASSERT
575 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
576 #endif
577
578 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
579 // These entries will generate build errors. Their purpose is to test the macros.
580 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
581 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
582 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
583 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
584 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
585 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
586 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
587 #endif
588
589 { nullptr, JDK_Version(0), JDK_Version(0) }
590 };
591
592 // Flags that are aliases for other flags.
593 typedef struct {
594 const char* alias_name;
595 const char* real_name;
596 } AliasedFlag;
597
598 static AliasedFlag const aliased_jvm_flags[] = {
599 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
600 { nullptr, nullptr}
601 };
602
603 // Return true if "v" is less than "other", where "other" may be "undefined".
604 static bool version_less_than(JDK_Version v, JDK_Version other) {
605 assert(!v.is_undefined(), "must be defined");
606 if (!other.is_undefined() && v.compare(other) >= 0) {
607 return false;
608 } else {
609 return true;
610 }
611 }
612
613 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
614 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
615 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
616 flag = special_jvm_flags[i];
617 return true;
618 }
619 }
620 return false;
621 }
622
623 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
624 assert(version != nullptr, "Must provide a version buffer");
625 SpecialFlag flag;
626 if (lookup_special_flag(flag_name, flag)) {
627 if (!flag.obsolete_in.is_undefined()) {
628 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
629 *version = flag.obsolete_in;
630 // This flag may have been marked for obsoletion in this version, but we may not
631 // have actually removed it yet. Rather than ignoring it as soon as we reach
632 // this version we allow some time for the removal to happen. So if the flag
633 // still actually exists we process it as normal, but issue an adjusted warning.
634 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
635 if (real_flag != nullptr) {
636 char version_str[256];
637 version->to_string(version_str, sizeof(version_str));
638 warning("Temporarily processing option %s; support is scheduled for removal in %s",
639 flag_name, version_str);
640 return false;
641 }
642 return true;
643 }
644 }
645 }
646 return false;
647 }
648
649 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
650 assert(version != nullptr, "Must provide a version buffer");
651 SpecialFlag flag;
652 if (lookup_special_flag(flag_name, flag)) {
653 if (!flag.deprecated_in.is_undefined()) {
654 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
655 version_less_than(JDK_Version::current(), flag.expired_in)) {
656 *version = flag.deprecated_in;
657 return 1;
658 } else {
659 return -1;
660 }
661 }
662 }
663 return 0;
664 }
665
666 const char* Arguments::real_flag_name(const char *flag_name) {
667 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
668 const AliasedFlag& flag_status = aliased_jvm_flags[i];
669 if (strcmp(flag_status.alias_name, flag_name) == 0) {
670 return flag_status.real_name;
671 }
672 }
673 return flag_name;
674 }
675
676 #ifdef ASSERT
677 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
678 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
679 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
680 return true;
681 }
682 }
683 return false;
684 }
685
686 // Verifies the correctness of the entries in the special_jvm_flags table.
687 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
688 // version being earlier than the deprecation version, then a warning is issued
689 // and verification fails - by returning false. If it is detected that the table
690 // is out of date, with respect to the current version, then ideally a warning is
691 // issued but verification does not fail. This allows the VM to operate when the
692 // version is first updated, without needing to update all the impacted flags at
693 // the same time. In practice we can't issue the warning immediately when the version
694 // is updated as it occurs for every test and some tests are not prepared to handle
695 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
696 // if the check_globals flag is true, and in addition allow a grace period and only
697 // check for stale flags when we hit build 25 (which is far enough into the 6 month
698 // release cycle that all flag updates should have been processed, whilst still
699 // leaving time to make the change before RDP2).
700 // We use a gtest to call this, passing true, so that we can detect stale flags before
701 // the end of the release cycle.
702
703 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
704
705 bool Arguments::verify_special_jvm_flags(bool check_globals) {
706 bool success = true;
707 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
708 const SpecialFlag& flag = special_jvm_flags[i];
709 if (lookup_special_flag(flag.name, i)) {
710 warning("Duplicate special flag declaration \"%s\"", flag.name);
711 success = false;
712 }
713 if (flag.deprecated_in.is_undefined() &&
714 flag.obsolete_in.is_undefined()) {
715 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
716 success = false;
717 }
718
719 if (!flag.deprecated_in.is_undefined()) {
720 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
721 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
722 success = false;
723 }
724
725 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
726 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
727 success = false;
728 }
729 }
730
731 if (!flag.obsolete_in.is_undefined()) {
732 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
733 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
734 success = false;
735 }
736
737 // if flag has become obsolete it should not have a "globals" flag defined anymore.
738 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
739 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
740 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
741 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
742 success = false;
743 }
744 }
745
746 } else if (!flag.expired_in.is_undefined()) {
747 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
748 success = false;
749 }
750
751 if (!flag.expired_in.is_undefined()) {
752 // if flag has become expired it should not have a "globals" flag defined anymore.
753 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
754 !version_less_than(JDK_Version::current(), flag.expired_in)) {
755 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
756 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
757 success = false;
758 }
759 }
760 }
761 }
762 return success;
763 }
764 #endif
765
766 bool Arguments::atojulong(const char *s, julong* result) {
767 return parse_integer(s, result);
768 }
769
770 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
771 if (size < min_size) return arg_too_small;
772 if (size > max_size) return arg_too_big;
773 return arg_in_range;
774 }
775
776 // Describe an argument out of range error
777 void Arguments::describe_range_error(ArgsRange errcode) {
778 switch(errcode) {
779 case arg_too_big:
780 jio_fprintf(defaultStream::error_stream(),
781 "The specified size exceeds the maximum "
782 "representable size.\n");
783 break;
784 case arg_too_small:
785 case arg_unreadable:
786 case arg_in_range:
787 // do nothing for now
788 break;
789 default:
790 ShouldNotReachHere();
791 }
792 }
793
794 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
795 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
796 return true;
797 } else {
798 return false;
799 }
800 }
801
802 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
803 // strtod allows leading whitespace, but our flag format does not.
804 if (*value == '\0' || isspace((unsigned char) *value)) {
805 return false;
806 }
807 char* end;
808 errno = 0;
809 double v = strtod(value, &end);
810 if ((errno != 0) || (*end != 0)) {
811 return false;
812 }
813 if (g_isnan(v) || !g_isfinite(v)) {
814 // Currently we cannot handle these special values.
815 return false;
816 }
817
818 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
819 return true;
820 }
821 return false;
822 }
823
824 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
825 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
826
827 if (flag->is_int()) {
828 int v;
829 if (parse_integer(value, &v)) {
830 result = JVMFlagAccess::set_int(flag, &v, origin);
831 }
832 } else if (flag->is_uint()) {
833 uint v;
834 if (parse_integer(value, &v)) {
835 result = JVMFlagAccess::set_uint(flag, &v, origin);
836 }
837 } else if (flag->is_intx()) {
838 intx v;
839 if (parse_integer(value, &v)) {
840 result = JVMFlagAccess::set_intx(flag, &v, origin);
841 }
842 } else if (flag->is_uintx()) {
843 uintx v;
844 if (parse_integer(value, &v)) {
845 result = JVMFlagAccess::set_uintx(flag, &v, origin);
846 }
847 } else if (flag->is_uint64_t()) {
848 uint64_t v;
849 if (parse_integer(value, &v)) {
850 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
851 }
852 } else if (flag->is_size_t()) {
853 size_t v;
854 if (parse_integer(value, &v)) {
855 result = JVMFlagAccess::set_size_t(flag, &v, origin);
856 }
857 }
858
859 return result == JVMFlag::SUCCESS;
860 }
861
862 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
863 if (value[0] == '\0') {
864 value = nullptr;
865 }
866 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
867 // Contract: JVMFlag always returns a pointer that needs freeing.
868 FREE_C_HEAP_ARRAY(char, value);
869 return true;
870 }
871
872 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
873 const char* old_value = "";
874 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
875 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
876 size_t new_len = strlen(new_value);
877 const char* value;
878 char* free_this_too = nullptr;
879 if (old_len == 0) {
880 value = new_value;
881 } else if (new_len == 0) {
882 value = old_value;
883 } else {
884 size_t length = old_len + 1 + new_len + 1;
885 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
886 // each new setting adds another LINE to the switch:
887 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
888 value = buf;
889 free_this_too = buf;
890 }
891 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
892 // JVMFlag always returns a pointer that needs freeing.
893 FREE_C_HEAP_ARRAY(char, value);
894 // JVMFlag made its own copy, so I must delete my own temp. buffer.
895 FREE_C_HEAP_ARRAY(char, free_this_too);
896 return true;
897 }
898
899 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
900 const char* real_name = real_flag_name(arg);
901 JDK_Version since = JDK_Version();
902 switch (is_deprecated_flag(arg, &since)) {
903 case -1: {
904 // Obsolete or expired, so don't process normally,
905 // but allow for an obsolete flag we're still
906 // temporarily allowing.
907 if (!is_obsolete_flag(arg, &since)) {
908 return real_name;
909 }
910 // Note if we're not considered obsolete then we can't be expired either
911 // as obsoletion must come first.
912 return nullptr;
913 }
914 case 0:
915 return real_name;
916 case 1: {
917 char version[256];
918 since.to_string(version, sizeof(version));
919 if (real_name != arg) {
920 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
921 arg, version, real_name);
922 } else {
923 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
924 arg, version);
925 }
926 return real_name;
927 }
928 }
929 ShouldNotReachHere();
930 return nullptr;
931 }
932
933 #define BUFLEN 255
934
935 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
936 char name_copied[BUFLEN+1];
937 if (name[name_length] != 0) {
938 if (name_length > BUFLEN) {
939 return nullptr;
940 } else {
941 strncpy(name_copied, name, name_length);
942 name_copied[name_length] = '\0';
943 name = name_copied;
944 }
945 }
946
947 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
948 if (real_name == nullptr) {
949 return nullptr;
950 }
951 JVMFlag* flag = JVMFlag::find_flag(real_name);
952 return flag;
953 }
954
955 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
956 bool is_bool = false;
957 bool bool_val = false;
958 char c = *arg;
959 if (c == '+' || c == '-') {
960 is_bool = true;
961 bool_val = (c == '+');
962 arg++;
963 }
964
965 const char* name = arg;
966 while (true) {
967 c = *arg;
968 if (isalnum(c) || (c == '_')) {
969 ++arg;
970 } else {
971 break;
972 }
973 }
974
975 size_t name_len = size_t(arg - name);
976 if (name_len == 0) {
977 return false;
978 }
979
980 JVMFlag* flag = find_jvm_flag(name, name_len);
981 if (flag == nullptr) {
982 return false;
983 }
984
985 if (is_bool) {
986 if (*arg != 0) {
987 // Error -- extra characters such as -XX:+BoolFlag=123
988 return false;
989 }
990 return set_bool_flag(flag, bool_val, origin);
991 }
992
993 if (arg[0] == '=') {
994 const char* value = arg + 1;
995 if (flag->is_ccstr()) {
996 if (flag->ccstr_accumulates()) {
997 return append_to_string_flag(flag, value, origin);
998 } else {
999 return set_string_flag(flag, value, origin);
1000 }
1001 } else if (flag->is_double()) {
1002 return set_fp_numeric_flag(flag, value, origin);
1003 } else {
1004 return set_numeric_flag(flag, value, origin);
1005 }
1006 }
1007
1008 if (arg[0] == ':' && arg[1] == '=') {
1009 // -XX:Foo:=xxx will reset the string flag to the given value.
1010 const char* value = arg + 2;
1011 return set_string_flag(flag, value, origin);
1012 }
1013
1014 return false;
1015 }
1016
1017 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1018 assert(bldarray != nullptr, "illegal argument");
1019
1020 if (arg == nullptr) {
1021 return;
1022 }
1023
1024 int new_count = *count + 1;
1025
1026 // expand the array and add arg to the last element
1027 if (*bldarray == nullptr) {
1028 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1029 } else {
1030 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1031 }
1032 (*bldarray)[*count] = os::strdup_check_oom(arg);
1033 *count = new_count;
1034 }
1035
1036 void Arguments::build_jvm_args(const char* arg) {
1037 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1038 }
1039
1040 void Arguments::build_jvm_flags(const char* arg) {
1041 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1042 }
1043
1044 // utility function to return a string that concatenates all
1045 // strings in a given char** array
1046 const char* Arguments::build_resource_string(char** args, int count) {
1047 if (args == nullptr || count == 0) {
1048 return nullptr;
1049 }
1050 size_t length = 0;
1051 for (int i = 0; i < count; i++) {
1052 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1053 }
1054 char* s = NEW_RESOURCE_ARRAY(char, length);
1055 char* dst = s;
1056 for (int j = 0; j < count; j++) {
1057 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1058 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1059 dst += offset;
1060 length -= offset;
1061 }
1062 return (const char*) s;
1063 }
1064
1065 void Arguments::print_on(outputStream* st) {
1066 st->print_cr("VM Arguments:");
1067 if (num_jvm_flags() > 0) {
1068 st->print("jvm_flags: "); print_jvm_flags_on(st);
1069 st->cr();
1070 }
1071 if (num_jvm_args() > 0) {
1072 st->print("jvm_args: "); print_jvm_args_on(st);
1073 st->cr();
1074 }
1075 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1076 if (_java_class_path != nullptr) {
1077 char* path = _java_class_path->value();
1078 size_t len = strlen(path);
1079 st->print("java_class_path (initial): ");
1080 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1081 if (len == 0) {
1082 st->print_raw_cr("<not set>");
1083 } else {
1084 st->print_raw_cr(path, len);
1085 }
1086 }
1087 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1088 }
1089
1090 void Arguments::print_summary_on(outputStream* st) {
1091 // Print the command line. Environment variables that are helpful for
1092 // reproducing the problem are written later in the hs_err file.
1093 // flags are from setting file
1094 if (num_jvm_flags() > 0) {
1095 st->print_raw("Settings File: ");
1096 print_jvm_flags_on(st);
1097 st->cr();
1098 }
1099 // args are the command line and environment variable arguments.
1100 st->print_raw("Command Line: ");
1101 if (num_jvm_args() > 0) {
1102 print_jvm_args_on(st);
1103 }
1104 // this is the classfile and any arguments to the java program
1105 if (java_command() != nullptr) {
1106 st->print("%s", java_command());
1107 }
1108 st->cr();
1109 }
1110
1111 void Arguments::print_jvm_flags_on(outputStream* st) {
1112 if (_num_jvm_flags > 0) {
1113 for (int i=0; i < _num_jvm_flags; i++) {
1114 st->print("%s ", _jvm_flags_array[i]);
1115 }
1116 }
1117 }
1118
1119 void Arguments::print_jvm_args_on(outputStream* st) {
1120 if (_num_jvm_args > 0) {
1121 for (int i=0; i < _num_jvm_args; i++) {
1122 st->print("%s ", _jvm_args_array[i]);
1123 }
1124 }
1125 }
1126
1127 bool Arguments::process_argument(const char* arg,
1128 jboolean ignore_unrecognized,
1129 JVMFlagOrigin origin) {
1130 JDK_Version since = JDK_Version();
1131
1132 if (parse_argument(arg, origin)) {
1133 return true;
1134 }
1135
1136 // Determine if the flag has '+', '-', or '=' characters.
1137 bool has_plus_minus = (*arg == '+' || *arg == '-');
1138 const char* const argname = has_plus_minus ? arg + 1 : arg;
1139
1140 size_t arg_len;
1141 const char* equal_sign = strchr(argname, '=');
1142 if (equal_sign == nullptr) {
1143 arg_len = strlen(argname);
1144 } else {
1145 arg_len = equal_sign - argname;
1146 }
1147
1148 // Only make the obsolete check for valid arguments.
1149 if (arg_len <= BUFLEN) {
1150 // Construct a string which consists only of the argument name without '+', '-', or '='.
1151 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1152 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1153 if (is_obsolete_flag(stripped_argname, &since)) {
1154 char version[256];
1155 since.to_string(version, sizeof(version));
1156 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1157 return true;
1158 }
1159 }
1160
1161 // For locked flags, report a custom error message if available.
1162 // Otherwise, report the standard unrecognized VM option.
1163 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1164 if (found_flag != nullptr) {
1165 char locked_message_buf[BUFLEN];
1166 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1167 if (strlen(locked_message_buf) != 0) {
1168 #ifdef PRODUCT
1169 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1170 if (ignore_unrecognized && mismatched) {
1171 return true;
1172 }
1173 #endif
1174 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1175 }
1176 if (found_flag->is_bool() && !has_plus_minus) {
1177 jio_fprintf(defaultStream::error_stream(),
1178 "Missing +/- setting for VM option '%s'\n", argname);
1179 } else if (!found_flag->is_bool() && has_plus_minus) {
1180 jio_fprintf(defaultStream::error_stream(),
1181 "Unexpected +/- setting in VM option '%s'\n", argname);
1182 } else {
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Improperly specified VM option '%s'\n", argname);
1185 }
1186 } else {
1187 if (ignore_unrecognized) {
1188 return true;
1189 }
1190 jio_fprintf(defaultStream::error_stream(),
1191 "Unrecognized VM option '%s'\n", argname);
1192 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1193 if (fuzzy_matched != nullptr) {
1194 jio_fprintf(defaultStream::error_stream(),
1195 "Did you mean '%s%s%s'?\n",
1196 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1197 fuzzy_matched->name(),
1198 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1199 }
1200 }
1201
1202 // allow for commandline "commenting out" options like -XX:#+Verbose
1203 return arg[0] == '#';
1204 }
1205
1206 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1207 FILE* stream = os::fopen(file_name, "rb");
1208 if (stream == nullptr) {
1209 if (should_exist) {
1210 jio_fprintf(defaultStream::error_stream(),
1211 "Could not open settings file %s\n", file_name);
1212 return false;
1213 } else {
1214 return true;
1215 }
1216 }
1217
1218 char token[1024];
1219 int pos = 0;
1220
1221 bool in_white_space = true;
1222 bool in_comment = false;
1223 bool in_quote = false;
1224 int quote_c = 0;
1225 bool result = true;
1226
1227 int c = getc(stream);
1228 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1229 if (in_white_space) {
1230 if (in_comment) {
1231 if (c == '\n') in_comment = false;
1232 } else {
1233 if (c == '#') in_comment = true;
1234 else if (!isspace((unsigned char) c)) {
1235 in_white_space = false;
1236 token[pos++] = checked_cast<char>(c);
1237 }
1238 }
1239 } else {
1240 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1241 // token ends at newline, or at unquoted whitespace
1242 // this allows a way to include spaces in string-valued options
1243 token[pos] = '\0';
1244 logOption(token);
1245 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1246 build_jvm_flags(token);
1247 pos = 0;
1248 in_white_space = true;
1249 in_quote = false;
1250 } else if (!in_quote && (c == '\'' || c == '"')) {
1251 in_quote = true;
1252 quote_c = c;
1253 } else if (in_quote && (c == quote_c)) {
1254 in_quote = false;
1255 } else {
1256 token[pos++] = checked_cast<char>(c);
1257 }
1258 }
1259 c = getc(stream);
1260 }
1261 if (pos > 0) {
1262 token[pos] = '\0';
1263 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1264 build_jvm_flags(token);
1265 }
1266 fclose(stream);
1267 return result;
1268 }
1269
1270 //=============================================================================================================
1271 // Parsing of properties (-D)
1272
1273 const char* Arguments::get_property(const char* key) {
1274 return PropertyList_get_value(system_properties(), key);
1275 }
1276
1277 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1278 const char* eq = strchr(prop, '=');
1279 const char* key;
1280 const char* value = "";
1281
1282 if (eq == nullptr) {
1283 // property doesn't have a value, thus use passed string
1284 key = prop;
1285 } else {
1286 // property have a value, thus extract it and save to the
1287 // allocated string
1288 size_t key_len = eq - prop;
1289 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1290
1291 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1292 key = tmp_key;
1293
1294 value = &prop[key_len + 1];
1295 }
1296
1297 if (internal == ExternalProperty) {
1298 CDSConfig::check_incompatible_property(key, value);
1299 }
1300
1301 if (strcmp(key, "java.compiler") == 0) {
1302 // we no longer support java.compiler system property, log a warning and let it get
1303 // passed to Java, like any other system property
1304 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1305 // for applications using NONE or empty value, log a more informative message
1306 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1307 } else {
1308 warning("The java.compiler system property is obsolete and no longer supported.");
1309 }
1310 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1311 // append is true, writable is true, internal is false
1312 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1313 WriteableProperty, ExternalProperty);
1314 } else {
1315 if (strcmp(key, "sun.java.command") == 0) {
1316 char *old_java_command = _java_command;
1317 _java_command = os::strdup_check_oom(value, mtArguments);
1318 if (old_java_command != nullptr) {
1319 os::free(old_java_command);
1320 }
1321 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1322 // If this property is set on the command line then its value will be
1323 // displayed in VM error logs as the URL at which to submit such logs.
1324 // Normally the URL displayed in error logs is different from the value
1325 // of this system property, so a different property should have been
1326 // used here, but we leave this as-is in case someone depends upon it.
1327 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1328 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1329 // its value without going through the property list or making a Java call.
1330 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1331 if (old_java_vendor_url_bug != nullptr) {
1332 os::free((void *)old_java_vendor_url_bug);
1333 }
1334 }
1335
1336 // Create new property and add at the end of the list
1337 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1338 }
1339
1340 if (key != prop) {
1341 // SystemProperty copy passed value, thus free previously allocated
1342 // memory
1343 FreeHeap((void *)key);
1344 }
1345
1346 return true;
1347 }
1348
1349 //===========================================================================================================
1350 // Setting int/mixed/comp mode flags
1351
1352 void Arguments::set_mode_flags(Mode mode) {
1353 // Set up default values for all flags.
1354 // If you add a flag to any of the branches below,
1355 // add a default value for it here.
1356 _mode = mode;
1357
1358 // Ensure Agent_OnLoad has the correct initial values.
1359 // This may not be the final mode; mode may change later in onload phase.
1360 PropertyList_unique_add(&_system_properties, "java.vm.info",
1361 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1362
1363 UseInterpreter = true;
1364 UseCompiler = true;
1365 UseLoopCounter = true;
1366
1367 // Default values may be platform/compiler dependent -
1368 // use the saved values
1369 ClipInlining = Arguments::_ClipInlining;
1370 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1371 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1372 BackgroundCompilation = Arguments::_BackgroundCompilation;
1373
1374 // Change from defaults based on mode
1375 switch (mode) {
1376 default:
1377 ShouldNotReachHere();
1378 break;
1379 case _int:
1380 UseCompiler = false;
1381 UseLoopCounter = false;
1382 AlwaysCompileLoopMethods = false;
1383 UseOnStackReplacement = false;
1384 break;
1385 case _mixed:
1386 // same as default
1387 break;
1388 case _comp:
1389 UseInterpreter = false;
1390 BackgroundCompilation = false;
1391 ClipInlining = false;
1392 break;
1393 }
1394 }
1395
1396 // Conflict: required to use shared spaces (-Xshare:on), but
1397 // incompatible command line options were chosen.
1398 void Arguments::no_shared_spaces(const char* message) {
1399 if (RequireSharedSpaces) {
1400 aot_log_error(aot)("%s is incompatible with other specified options.",
1401 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1402 if (CDSConfig::new_aot_flags_used()) {
1403 vm_exit_during_initialization("Unable to use AOT cache", message);
1404 } else {
1405 vm_exit_during_initialization("Unable to use shared archive", message);
1406 }
1407 } else {
1408 if (CDSConfig::new_aot_flags_used()) {
1409 log_warning(aot)("Unable to use AOT cache: %s", message);
1410 } else {
1411 aot_log_info(aot)("Unable to use shared archive: %s", message);
1412 }
1413 UseSharedSpaces = false;
1414 }
1415 }
1416
1417 static void set_object_alignment() {
1418 // Object alignment.
1419 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1420 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1421 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1422 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1423 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1424 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1425
1426 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1427 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1428
1429 // Oop encoding heap max
1430 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1431 }
1432
1433 size_t Arguments::max_heap_for_compressed_oops() {
1434 // Avoid sign flip.
1435 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1436 // We need to fit both the null page and the heap into the memory budget, while
1437 // keeping alignment constraints of the heap. To guarantee the latter, as the
1438 // null page is located before the heap, we pad the null page to the conservative
1439 // maximum alignment that the GC may ever impose upon the heap.
1440 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1441 _conservative_max_heap_alignment);
1442
1443 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1444 NOT_LP64(ShouldNotReachHere(); return 0);
1445 }
1446
1447 void Arguments::set_use_compressed_oops() {
1448 #ifdef _LP64
1449 // MaxHeapSize is not set up properly at this point, but
1450 // the only value that can override MaxHeapSize if we are
1451 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1452 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1453
1454 if (max_heap_size <= max_heap_for_compressed_oops()) {
1455 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1456 FLAG_SET_ERGO(UseCompressedOops, true);
1457 }
1458 } else {
1459 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1460 warning("Max heap size too large for Compressed Oops");
1461 FLAG_SET_DEFAULT(UseCompressedOops, false);
1462 }
1463 }
1464 #endif // _LP64
1465 }
1466
1467 void Arguments::set_conservative_max_heap_alignment() {
1468 // The conservative maximum required alignment for the heap is the maximum of
1469 // the alignments imposed by several sources: any requirements from the heap
1470 // itself and the maximum page size we may run the VM with.
1471 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1472 _conservative_max_heap_alignment = MAX4(heap_alignment,
1473 os::vm_allocation_granularity(),
1474 os::max_page_size(),
1475 GCArguments::compute_heap_alignment());
1476 }
1477
1478 jint Arguments::set_ergonomics_flags() {
1479 GCConfig::initialize();
1480
1481 set_conservative_max_heap_alignment();
1482
1483 #ifdef _LP64
1484 set_use_compressed_oops();
1485
1486 // Also checks that certain machines are slower with compressed oops
1487 // in vm_version initialization code.
1488 #endif // _LP64
1489
1490 return JNI_OK;
1491 }
1492
1493 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1494 // The AggressiveHeap check is a temporary workaround to avoid calling
1495 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1496 // selected. This works because AggressiveHeap implies UseParallelGC
1497 // where we know the ratio will be 1. Once the AggressiveHeap option is
1498 // removed, this can be cleaned up.
1499 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1500 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1501 size_t max_allocatable = os::commit_memory_limit();
1502
1503 return MIN2(limit, max_allocatable / fraction);
1504 }
1505
1506 // Use static initialization to get the default before parsing
1507 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1508
1509 static size_t clamp_by_size_t_max(uint64_t value) {
1510 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1511 }
1512
1513 void Arguments::set_heap_size() {
1514 // Check if the user has configured any limit on the amount of RAM we may use.
1515 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1516 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1517 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1518 !FLAG_IS_DEFAULT(MaxRAM);
1519
1520 if (FLAG_IS_DEFAULT(MaxRAM)) {
1521 if (CompilerConfig::should_set_client_emulation_mode_flags()) {
1522 // Limit the available memory if client emulation mode is enabled.
1523 FLAG_SET_ERGO(MaxRAM, 1ULL*G);
1524 } else {
1525 // Use the available physical memory on the system.
1526 FLAG_SET_ERGO(MaxRAM, os::physical_memory());
1527 }
1528 }
1529
1530 // If the maximum heap size has not been set with -Xmx, then set it as
1531 // fraction of the size of physical memory, respecting the maximum and
1532 // minimum sizes of the heap.
1533 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1534 uint64_t min_memory = (uint64_t)(((double)MaxRAM * MinRAMPercentage) / 100);
1535 uint64_t max_memory = (uint64_t)(((double)MaxRAM * MaxRAMPercentage) / 100);
1536
1537 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1538 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1539
1540 if (reasonable_min < MaxHeapSize) {
1541 // Small physical memory, so use a minimum fraction of it for the heap
1542 reasonable_max = reasonable_min;
1543 } else {
1544 // Not-small physical memory, so require a heap at least
1545 // as large as MaxHeapSize
1546 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1547 }
1548
1549 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1550 // Limit the heap size to ErgoHeapSizeLimit
1551 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1552 }
1553
1554 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1555
1556 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1557 // An initial heap size was specified on the command line,
1558 // so be sure that the maximum size is consistent. Done
1559 // after call to limit_heap_by_allocatable_memory because that
1560 // method might reduce the allocation size.
1561 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1562 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1563 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1564 }
1565
1566 #ifdef _LP64
1567 if (UseCompressedOops || UseCompressedClassPointers) {
1568 // HeapBaseMinAddress can be greater than default but not less than.
1569 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1570 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1571 // matches compressed oops printing flags
1572 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1573 "(%zuG) which is greater than value given %zu",
1574 DefaultHeapBaseMinAddress,
1575 DefaultHeapBaseMinAddress/G,
1576 HeapBaseMinAddress);
1577 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1578 }
1579 }
1580 }
1581
1582 if (UseCompressedOops) {
1583 size_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1584 size_t max_coop_heap = max_heap_for_compressed_oops();
1585
1586 // Limit the heap size to the maximum possible when using compressed oops
1587 if (heap_end < max_coop_heap) {
1588 // Heap should be above HeapBaseMinAddress to get zero based compressed
1589 // oops but it should be not less than default MaxHeapSize.
1590 max_coop_heap -= HeapBaseMinAddress;
1591 }
1592
1593 // If the user has configured any limit on the amount of RAM we may use,
1594 // then disable compressed oops if the calculated max exceeds max_coop_heap
1595 // and UseCompressedOops was not specified.
1596 if (reasonable_max > max_coop_heap) {
1597 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1598 aot_log_info(aot)("UseCompressedOops disabled due to "
1599 "max heap %zu > compressed oop heap %zu. "
1600 "Please check the setting of MaxRAMPercentage %5.2f.",
1601 reasonable_max, max_coop_heap, MaxRAMPercentage);
1602 FLAG_SET_ERGO(UseCompressedOops, false);
1603 } else {
1604 reasonable_max = max_coop_heap;
1605 }
1606 }
1607 }
1608 #endif // _LP64
1609
1610 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1611 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1612 }
1613
1614 // If the minimum or initial heap_size have not been set or requested to be set
1615 // ergonomically, set them accordingly.
1616 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1617 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1618 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1619 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1620
1621 if (InitialHeapSize == 0) {
1622 uint64_t initial_memory = (uint64_t)(((double)MaxRAM * InitialRAMPercentage) / 100);
1623 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1624 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1625
1626 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1627 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1628
1629 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1630 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1631 }
1632
1633 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1634 // synchronize with InitialHeapSize to avoid errors with the default value.
1635 if (MinHeapSize == 0) {
1636 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1637 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1638 }
1639 }
1640 }
1641
1642 // This option inspects the machine and attempts to set various
1643 // parameters to be optimal for long-running, memory allocation
1644 // intensive jobs. It is intended for machines with large
1645 // amounts of cpu and memory.
1646 jint Arguments::set_aggressive_heap_flags() {
1647 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1648 // VM, but we may not be able to represent the total physical memory
1649 // available (like having 8gb of memory on a box but using a 32bit VM).
1650 // Thus, we need to make sure we're using a julong for intermediate
1651 // calculations.
1652 julong initHeapSize;
1653 physical_memory_size_type phys_mem = os::physical_memory();
1654 julong total_memory = static_cast<julong>(phys_mem);
1655
1656 if (total_memory < (julong) 256 * M) {
1657 jio_fprintf(defaultStream::error_stream(),
1658 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1659 vm_exit(1);
1660 }
1661
1662 // The heap size is half of available memory, or (at most)
1663 // all of possible memory less 160mb (leaving room for the OS
1664 // when using ISM). This is the maximum; because adaptive sizing
1665 // is turned on below, the actual space used may be smaller.
1666
1667 initHeapSize = MIN2(total_memory / (julong) 2,
1668 total_memory - (julong) 160 * M);
1669
1670 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1671
1672 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1673 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1674 return JNI_EINVAL;
1675 }
1676 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1677 return JNI_EINVAL;
1678 }
1679 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1680 return JNI_EINVAL;
1681 }
1682 }
1683 if (FLAG_IS_DEFAULT(NewSize)) {
1684 // Make the young generation 3/8ths of the total heap.
1685 if (FLAG_SET_CMDLINE(NewSize,
1686 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1687 return JNI_EINVAL;
1688 }
1689 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1690 return JNI_EINVAL;
1691 }
1692 }
1693
1694 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1695 FLAG_SET_DEFAULT(UseLargePages, true);
1696 #endif
1697
1698 // Increase some data structure sizes for efficiency
1699 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1700 return JNI_EINVAL;
1701 }
1702 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1703 return JNI_EINVAL;
1704 }
1705
1706 // See the OldPLABSize comment below, but replace 'after promotion'
1707 // with 'after copying'. YoungPLABSize is the size of the survivor
1708 // space per-gc-thread buffers. The default is 4kw.
1709 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1710 return JNI_EINVAL;
1711 }
1712
1713 // OldPLABSize is the size of the buffers in the old gen that
1714 // UseParallelGC uses to promote live data that doesn't fit in the
1715 // survivor spaces. At any given time, there's one for each gc thread.
1716 // The default size is 1kw. These buffers are rarely used, since the
1717 // survivor spaces are usually big enough. For specjbb, however, there
1718 // are occasions when there's lots of live data in the young gen
1719 // and we end up promoting some of it. We don't have a definite
1720 // explanation for why bumping OldPLABSize helps, but the theory
1721 // is that a bigger PLAB results in retaining something like the
1722 // original allocation order after promotion, which improves mutator
1723 // locality. A minor effect may be that larger PLABs reduce the
1724 // number of PLAB allocation events during gc. The value of 8kw
1725 // was arrived at by experimenting with specjbb.
1726 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1727 return JNI_EINVAL;
1728 }
1729
1730 // Enable parallel GC and adaptive generation sizing
1731 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1732 return JNI_EINVAL;
1733 }
1734
1735 // Encourage steady state memory management
1736 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1737 return JNI_EINVAL;
1738 }
1739
1740 return JNI_OK;
1741 }
1742
1743 // This must be called after ergonomics.
1744 void Arguments::set_bytecode_flags() {
1745 if (!RewriteBytecodes) {
1746 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1747 }
1748 }
1749
1750 // Aggressive optimization flags
1751 jint Arguments::set_aggressive_opts_flags() {
1752 #ifdef COMPILER2
1753 if (AggressiveUnboxing) {
1754 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1755 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1756 } else if (!EliminateAutoBox) {
1757 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1758 AggressiveUnboxing = false;
1759 }
1760 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1761 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1762 } else if (!DoEscapeAnalysis) {
1763 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1764 AggressiveUnboxing = false;
1765 }
1766 }
1767 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1768 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1769 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1770 }
1771 // Feed the cache size setting into the JDK
1772 char buffer[1024];
1773 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1774 if (!add_property(buffer)) {
1775 return JNI_ENOMEM;
1776 }
1777 }
1778 #endif
1779
1780 return JNI_OK;
1781 }
1782
1783 //===========================================================================================================
1784
1785 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1786 if (_sun_java_launcher != _default_java_launcher) {
1787 os::free(const_cast<char*>(_sun_java_launcher));
1788 }
1789 _sun_java_launcher = os::strdup_check_oom(launcher);
1790 }
1791
1792 bool Arguments::created_by_java_launcher() {
1793 assert(_sun_java_launcher != nullptr, "property must have value");
1794 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1795 }
1796
1797 bool Arguments::executing_unit_tests() {
1798 return _executing_unit_tests;
1799 }
1800
1801 //===========================================================================================================
1802 // Parsing of main arguments
1803
1804 static unsigned int addreads_count = 0;
1805 static unsigned int addexports_count = 0;
1806 static unsigned int addopens_count = 0;
1807 static unsigned int patch_mod_count = 0;
1808 static unsigned int enable_native_access_count = 0;
1809 static bool patch_mod_javabase = false;
1810
1811 // Check the consistency of vm_init_args
1812 bool Arguments::check_vm_args_consistency() {
1813 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1814 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1815 return false;
1816 }
1817
1818 // Method for adding checks for flag consistency.
1819 // The intent is to warn the user of all possible conflicts,
1820 // before returning an error.
1821 // Note: Needs platform-dependent factoring.
1822 bool status = true;
1823
1824 if (TLABRefillWasteFraction == 0) {
1825 jio_fprintf(defaultStream::error_stream(),
1826 "TLABRefillWasteFraction should be a denominator, "
1827 "not %zu\n",
1828 TLABRefillWasteFraction);
1829 status = false;
1830 }
1831
1832 status = CompilerConfig::check_args_consistency(status);
1833 #if INCLUDE_JVMCI
1834 if (status && EnableJVMCI) {
1835 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1836 // was explicitly set on the command line or in the jimage.
1837 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1838 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1839 return false;
1840 }
1841 }
1842 }
1843 #endif
1844
1845 #if INCLUDE_JFR
1846 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1847 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1848 return false;
1849 }
1850 }
1851 #endif
1852
1853 #ifndef SUPPORT_RESERVED_STACK_AREA
1854 if (StackReservedPages != 0) {
1855 FLAG_SET_CMDLINE(StackReservedPages, 0);
1856 warning("Reserved Stack Area not supported on this platform");
1857 }
1858 #endif
1859
1860 return status;
1861 }
1862
1863 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1864 const char* option_type) {
1865 if (ignore) return false;
1866
1867 const char* spacer = " ";
1868 if (option_type == nullptr) {
1869 option_type = ++spacer; // Set both to the empty string.
1870 }
1871
1872 jio_fprintf(defaultStream::error_stream(),
1873 "Unrecognized %s%soption: %s\n", option_type, spacer,
1874 option->optionString);
1875 return true;
1876 }
1877
1878 static const char* user_assertion_options[] = {
1879 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1880 };
1881
1882 static const char* system_assertion_options[] = {
1883 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1884 };
1885
1886 bool Arguments::parse_uint(const char* value,
1887 uint* uint_arg,
1888 uint min_size) {
1889 uint n;
1890 if (!parse_integer(value, &n)) {
1891 return false;
1892 }
1893 if (n >= min_size) {
1894 *uint_arg = n;
1895 return true;
1896 } else {
1897 return false;
1898 }
1899 }
1900
1901 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1902 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1903 CDSConfig::check_internal_module_property(prop_name, prop_value);
1904 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1905 char* property = AllocateHeap(prop_len, mtArguments);
1906 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1907 if (ret < 0 || ret >= (int)prop_len) {
1908 FreeHeap(property);
1909 return false;
1910 }
1911 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1912 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1913 // that multiple occurrences of the associated flag just causes the existing property value to be
1914 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1915 // to a property after we have finished flag processing.
1916 bool added = add_property(property, WriteableProperty, internal);
1917 FreeHeap(property);
1918 return added;
1919 }
1920
1921 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1922 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1923 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1924 const unsigned int props_count_limit = 1000;
1925 const int max_digits = 3;
1926 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1927
1928 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1929 if (count < props_count_limit) {
1930 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1931 char* property = AllocateHeap(prop_len, mtArguments);
1932 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1933 if (ret < 0 || ret >= (int)prop_len) {
1934 FreeHeap(property);
1935 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1936 return false;
1937 }
1938 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1939 FreeHeap(property);
1940 return added;
1941 }
1942
1943 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1944 return false;
1945 }
1946
1947 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1948 julong* long_arg,
1949 julong min_size,
1950 julong max_size) {
1951 if (!parse_integer(s, long_arg)) return arg_unreadable;
1952 return check_memory_size(*long_arg, min_size, max_size);
1953 }
1954
1955 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1956 // Save default settings for some mode flags
1957 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1958 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1959 Arguments::_ClipInlining = ClipInlining;
1960 Arguments::_BackgroundCompilation = BackgroundCompilation;
1961
1962 // Remember the default value of SharedBaseAddress.
1963 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1964
1965 // Setup flags for mixed which is the default
1966 set_mode_flags(_mixed);
1967
1968 jint result;
1969 for (int i = 0; i < all_args->length(); i++) {
1970 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1971 if (result != JNI_OK) {
1972 return result;
1973 }
1974 }
1975
1976 // Disable CDS for exploded image
1977 if (!has_jimage()) {
1978 no_shared_spaces("CDS disabled on exploded JDK");
1979 }
1980
1981 // We need to ensure processor and memory resources have been properly
1982 // configured - which may rely on arguments we just processed - before
1983 // doing the final argument processing. Any argument processing that
1984 // needs to know about processor and memory resources must occur after
1985 // this point.
1986
1987 os::init_container_support();
1988
1989 SystemMemoryBarrier::initialize();
1990
1991 // Do final processing now that all arguments have been parsed
1992 result = finalize_vm_init_args();
1993 if (result != JNI_OK) {
1994 return result;
1995 }
1996
1997 return JNI_OK;
1998 }
1999
2000 #if !INCLUDE_JVMTI || INCLUDE_CDS
2001 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2002 // represents a valid JDWP agent. is_path==true denotes that we
2003 // are dealing with -agentpath (case where name is a path), otherwise with
2004 // -agentlib
2005 static bool valid_jdwp_agent(char *name, bool is_path) {
2006 char *_name;
2007 const char *_jdwp = "jdwp";
2008 size_t _len_jdwp, _len_prefix;
2009
2010 if (is_path) {
2011 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2012 return false;
2013 }
2014
2015 _name++; // skip past last path separator
2016 _len_prefix = strlen(JNI_LIB_PREFIX);
2017
2018 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2019 return false;
2020 }
2021
2022 _name += _len_prefix;
2023 _len_jdwp = strlen(_jdwp);
2024
2025 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2026 _name += _len_jdwp;
2027 }
2028 else {
2029 return false;
2030 }
2031
2032 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2033 return false;
2034 }
2035
2036 return true;
2037 }
2038
2039 if (strcmp(name, _jdwp) == 0) {
2040 return true;
2041 }
2042
2043 return false;
2044 }
2045 #endif
2046
2047 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2048 // --patch-module=<module>=<file>(<pathsep><file>)*
2049 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2050 // Find the equal sign between the module name and the path specification
2051 const char* module_equal = strchr(patch_mod_tail, '=');
2052 if (module_equal == nullptr) {
2053 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2054 return JNI_ERR;
2055 } else {
2056 // Pick out the module name
2057 size_t module_len = module_equal - patch_mod_tail;
2058 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2059 if (module_name != nullptr) {
2060 memcpy(module_name, patch_mod_tail, module_len);
2061 *(module_name + module_len) = '\0';
2062 // The path piece begins one past the module_equal sign
2063 add_patch_mod_prefix(module_name, module_equal + 1);
2064 FREE_C_HEAP_ARRAY(char, module_name);
2065 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2066 return JNI_ENOMEM;
2067 }
2068 } else {
2069 return JNI_ENOMEM;
2070 }
2071 }
2072 return JNI_OK;
2073 }
2074
2075 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2076 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2077 // The min and max sizes match the values in globals.hpp, but scaled
2078 // with K. The values have been chosen so that alignment with page
2079 // size doesn't change the max value, which makes the conversions
2080 // back and forth between Xss value and ThreadStackSize value easier.
2081 // The values have also been chosen to fit inside a 32-bit signed type.
2082 const julong min_ThreadStackSize = 0;
2083 const julong max_ThreadStackSize = 1 * M;
2084
2085 // Make sure the above values match the range set in globals.hpp
2086 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2087 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2088 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2089
2090 const julong min_size = min_ThreadStackSize * K;
2091 const julong max_size = max_ThreadStackSize * K;
2092
2093 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2094
2095 julong size = 0;
2096 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2097 if (errcode != arg_in_range) {
2098 bool silent = (option == nullptr); // Allow testing to silence error messages
2099 if (!silent) {
2100 jio_fprintf(defaultStream::error_stream(),
2101 "Invalid thread stack size: %s\n", option->optionString);
2102 describe_range_error(errcode);
2103 }
2104 return JNI_EINVAL;
2105 }
2106
2107 // Internally track ThreadStackSize in units of 1024 bytes.
2108 const julong size_aligned = align_up(size, K);
2109 assert(size <= size_aligned,
2110 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2111 size, size_aligned);
2112
2113 const julong size_in_K = size_aligned / K;
2114 assert(size_in_K < (julong)max_intx,
2115 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2116 size_in_K);
2117
2118 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2119 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2120 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2121 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2122 max_expanded, size_in_K);
2123
2124 *out_ThreadStackSize = (intx)size_in_K;
2125
2126 return JNI_OK;
2127 }
2128
2129 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2130 // For match_option to return remaining or value part of option string
2131 const char* tail;
2132
2133 // iterate over arguments
2134 for (int index = 0; index < args->nOptions; index++) {
2135 bool is_absolute_path = false; // for -agentpath vs -agentlib
2136
2137 const JavaVMOption* option = args->options + index;
2138
2139 if (!match_option(option, "-Djava.class.path", &tail) &&
2140 !match_option(option, "-Dsun.java.command", &tail) &&
2141 !match_option(option, "-Dsun.java.launcher", &tail)) {
2142
2143 // add all jvm options to the jvm_args string. This string
2144 // is used later to set the java.vm.args PerfData string constant.
2145 // the -Djava.class.path and the -Dsun.java.command options are
2146 // omitted from jvm_args string as each have their own PerfData
2147 // string constant object.
2148 build_jvm_args(option->optionString);
2149 }
2150
2151 // -verbose:[class/module/gc/jni]
2152 if (match_option(option, "-verbose", &tail)) {
2153 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2154 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2155 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2156 } else if (!strcmp(tail, ":module")) {
2157 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2158 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2159 } else if (!strcmp(tail, ":gc")) {
2160 if (_legacyGCLogging.lastFlag == 0) {
2161 _legacyGCLogging.lastFlag = 1;
2162 }
2163 } else if (!strcmp(tail, ":jni")) {
2164 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2165 }
2166 // -da / -ea / -disableassertions / -enableassertions
2167 // These accept an optional class/package name separated by a colon, e.g.,
2168 // -da:java.lang.Thread.
2169 } else if (match_option(option, user_assertion_options, &tail, true)) {
2170 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2171 if (*tail == '\0') {
2172 JavaAssertions::setUserClassDefault(enable);
2173 } else {
2174 assert(*tail == ':', "bogus match by match_option()");
2175 JavaAssertions::addOption(tail + 1, enable);
2176 }
2177 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2178 } else if (match_option(option, system_assertion_options, &tail, false)) {
2179 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2180 JavaAssertions::setSystemClassDefault(enable);
2181 // -bootclasspath:
2182 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2183 jio_fprintf(defaultStream::output_stream(),
2184 "-Xbootclasspath is no longer a supported option.\n");
2185 return JNI_EINVAL;
2186 // -bootclasspath/a:
2187 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2188 Arguments::append_sysclasspath(tail);
2189 // -bootclasspath/p:
2190 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2191 jio_fprintf(defaultStream::output_stream(),
2192 "-Xbootclasspath/p is no longer a supported option.\n");
2193 return JNI_EINVAL;
2194 // -Xrun
2195 } else if (match_option(option, "-Xrun", &tail)) {
2196 if (tail != nullptr) {
2197 const char* pos = strchr(tail, ':');
2198 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2199 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2200 jio_snprintf(name, len + 1, "%s", tail);
2201
2202 char *options = nullptr;
2203 if(pos != nullptr) {
2204 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2205 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2206 }
2207 #if !INCLUDE_JVMTI
2208 if (strcmp(name, "jdwp") == 0) {
2209 jio_fprintf(defaultStream::error_stream(),
2210 "Debugging agents are not supported in this VM\n");
2211 return JNI_ERR;
2212 }
2213 #endif // !INCLUDE_JVMTI
2214 JvmtiAgentList::add_xrun(name, options, false);
2215 FREE_C_HEAP_ARRAY(char, name);
2216 FREE_C_HEAP_ARRAY(char, options);
2217 }
2218 } else if (match_option(option, "--add-reads=", &tail)) {
2219 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2220 return JNI_ENOMEM;
2221 }
2222 } else if (match_option(option, "--add-exports=", &tail)) {
2223 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2224 return JNI_ENOMEM;
2225 }
2226 } else if (match_option(option, "--add-opens=", &tail)) {
2227 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2228 return JNI_ENOMEM;
2229 }
2230 } else if (match_option(option, "--add-modules=", &tail)) {
2231 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2232 return JNI_ENOMEM;
2233 }
2234 #if INCLUDE_JVMCI
2235 if (!_jvmci_module_added) {
2236 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2237 if (jvmci_module != nullptr) {
2238 char before = *(jvmci_module - 1);
2239 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2240 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2241 FLAG_SET_DEFAULT(EnableJVMCI, true);
2242 _jvmci_module_added = true;
2243 }
2244 }
2245 }
2246 #endif
2247 } else if (match_option(option, "--enable-native-access=", &tail)) {
2248 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2249 return JNI_ENOMEM;
2250 }
2251 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2252 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2253 return JNI_ENOMEM;
2254 }
2255 } else if (match_option(option, "--limit-modules=", &tail)) {
2256 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2257 return JNI_ENOMEM;
2258 }
2259 } else if (match_option(option, "--module-path=", &tail)) {
2260 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2261 return JNI_ENOMEM;
2262 }
2263 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2264 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2265 return JNI_ENOMEM;
2266 }
2267 } else if (match_option(option, "--patch-module=", &tail)) {
2268 // --patch-module=<module>=<file>(<pathsep><file>)*
2269 int res = process_patch_mod_option(tail);
2270 if (res != JNI_OK) {
2271 return res;
2272 }
2273 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2274 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2275 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2276 AddProperty, WriteableProperty, InternalProperty);
2277 } else {
2278 jio_fprintf(defaultStream::error_stream(),
2279 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2280 return JNI_ERR;
2281 }
2282 } else if (match_option(option, "--illegal-access=", &tail)) {
2283 char version[256];
2284 JDK_Version::jdk(17).to_string(version, sizeof(version));
2285 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2286 // -agentlib and -agentpath
2287 } else if (match_option(option, "-agentlib:", &tail) ||
2288 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2289 if(tail != nullptr) {
2290 const char* pos = strchr(tail, '=');
2291 char* name;
2292 if (pos == nullptr) {
2293 name = os::strdup_check_oom(tail, mtArguments);
2294 } else {
2295 size_t len = pos - tail;
2296 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2297 memcpy(name, tail, len);
2298 name[len] = '\0';
2299 }
2300
2301 char *options = nullptr;
2302 if(pos != nullptr) {
2303 options = os::strdup_check_oom(pos + 1, mtArguments);
2304 }
2305 #if !INCLUDE_JVMTI
2306 if (valid_jdwp_agent(name, is_absolute_path)) {
2307 jio_fprintf(defaultStream::error_stream(),
2308 "Debugging agents are not supported in this VM\n");
2309 return JNI_ERR;
2310 }
2311 #elif INCLUDE_CDS
2312 if (valid_jdwp_agent(name, is_absolute_path)) {
2313 _has_jdwp_agent = true;
2314 }
2315 #endif // !INCLUDE_JVMTI
2316 JvmtiAgentList::add(name, options, is_absolute_path);
2317 os::free(name);
2318 os::free(options);
2319 }
2320 // -javaagent
2321 } else if (match_option(option, "-javaagent:", &tail)) {
2322 #if !INCLUDE_JVMTI
2323 jio_fprintf(defaultStream::error_stream(),
2324 "Instrumentation agents are not supported in this VM\n");
2325 return JNI_ERR;
2326 #else
2327 if (tail != nullptr) {
2328 size_t length = strlen(tail) + 1;
2329 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2330 jio_snprintf(options, length, "%s", tail);
2331 JvmtiAgentList::add("instrument", options, false);
2332 FREE_C_HEAP_ARRAY(char, options);
2333
2334 // java agents need module java.instrument
2335 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2336 return JNI_ENOMEM;
2337 }
2338 }
2339 #endif // !INCLUDE_JVMTI
2340 // --enable_preview
2341 } else if (match_option(option, "--enable-preview")) {
2342 set_enable_preview();
2343 // -Xnoclassgc
2344 } else if (match_option(option, "-Xnoclassgc")) {
2345 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2346 return JNI_EINVAL;
2347 }
2348 // -Xbatch
2349 } else if (match_option(option, "-Xbatch")) {
2350 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2351 return JNI_EINVAL;
2352 }
2353 // -Xmn for compatibility with other JVM vendors
2354 } else if (match_option(option, "-Xmn", &tail)) {
2355 julong long_initial_young_size = 0;
2356 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2357 if (errcode != arg_in_range) {
2358 jio_fprintf(defaultStream::error_stream(),
2359 "Invalid initial young generation size: %s\n", option->optionString);
2360 describe_range_error(errcode);
2361 return JNI_EINVAL;
2362 }
2363 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2364 return JNI_EINVAL;
2365 }
2366 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2367 return JNI_EINVAL;
2368 }
2369 // -Xms
2370 } else if (match_option(option, "-Xms", &tail)) {
2371 julong size = 0;
2372 // an initial heap size of 0 means automatically determine
2373 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2374 if (errcode != arg_in_range) {
2375 jio_fprintf(defaultStream::error_stream(),
2376 "Invalid initial heap size: %s\n", option->optionString);
2377 describe_range_error(errcode);
2378 return JNI_EINVAL;
2379 }
2380 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2381 return JNI_EINVAL;
2382 }
2383 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2384 return JNI_EINVAL;
2385 }
2386 // -Xmx
2387 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2388 julong long_max_heap_size = 0;
2389 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2390 if (errcode != arg_in_range) {
2391 jio_fprintf(defaultStream::error_stream(),
2392 "Invalid maximum heap size: %s\n", option->optionString);
2393 describe_range_error(errcode);
2394 return JNI_EINVAL;
2395 }
2396 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2397 return JNI_EINVAL;
2398 }
2399 // Xmaxf
2400 } else if (match_option(option, "-Xmaxf", &tail)) {
2401 char* err;
2402 double dmaxf = strtod(tail, &err);
2403 if (*err != '\0' || *tail == '\0') {
2404 jio_fprintf(defaultStream::error_stream(),
2405 "Bad max heap free ratio: %s\n",
2406 option->optionString);
2407 return JNI_EINVAL;
2408 }
2409 if (dmaxf < 0.0 || dmaxf > 1.0) {
2410 jio_fprintf(defaultStream::error_stream(),
2411 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2412 option->optionString);
2413 return JNI_EINVAL;
2414 }
2415 const uintx umaxf = (uintx)(dmaxf * 100);
2416 if (MinHeapFreeRatio > umaxf) {
2417 jio_fprintf(defaultStream::error_stream(),
2418 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2419 tail, MinHeapFreeRatio / 100.0f);
2420 return JNI_EINVAL;
2421 }
2422 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2423 return JNI_EINVAL;
2424 }
2425 // Xminf
2426 } else if (match_option(option, "-Xminf", &tail)) {
2427 char* err;
2428 double dminf = strtod(tail, &err);
2429 if (*err != '\0' || *tail == '\0') {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Bad min heap free ratio: %s\n",
2432 option->optionString);
2433 return JNI_EINVAL;
2434 }
2435 if (dminf < 0.0 || dminf > 1.0) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2438 tail);
2439 return JNI_EINVAL;
2440 }
2441 const uintx uminf = (uintx)(dminf * 100);
2442 if (MaxHeapFreeRatio < uminf) {
2443 jio_fprintf(defaultStream::error_stream(),
2444 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2445 tail, MaxHeapFreeRatio / 100.0f);
2446 return JNI_EINVAL;
2447 }
2448 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2449 return JNI_EINVAL;
2450 }
2451 // -Xss
2452 } else if (match_option(option, "-Xss", &tail)) {
2453 intx value = 0;
2454 jint err = parse_xss(option, tail, &value);
2455 if (err != JNI_OK) {
2456 return err;
2457 }
2458 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2459 return JNI_EINVAL;
2460 }
2461 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2462 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2463 julong long_ReservedCodeCacheSize = 0;
2464
2465 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2466 if (errcode != arg_in_range) {
2467 jio_fprintf(defaultStream::error_stream(),
2468 "Invalid maximum code cache size: %s.\n", option->optionString);
2469 return JNI_EINVAL;
2470 }
2471 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2472 return JNI_EINVAL;
2473 }
2474 // -green
2475 } else if (match_option(option, "-green")) {
2476 jio_fprintf(defaultStream::error_stream(),
2477 "Green threads support not available\n");
2478 return JNI_EINVAL;
2479 // -native
2480 } else if (match_option(option, "-native")) {
2481 // HotSpot always uses native threads, ignore silently for compatibility
2482 // -Xrs
2483 } else if (match_option(option, "-Xrs")) {
2484 // Classic/EVM option, new functionality
2485 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2486 return JNI_EINVAL;
2487 }
2488 // -Xprof
2489 } else if (match_option(option, "-Xprof")) {
2490 char version[256];
2491 // Obsolete in JDK 10
2492 JDK_Version::jdk(10).to_string(version, sizeof(version));
2493 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2494 // -Xinternalversion
2495 } else if (match_option(option, "-Xinternalversion")) {
2496 jio_fprintf(defaultStream::output_stream(), "%s\n",
2497 VM_Version::internal_vm_info_string());
2498 vm_exit(0);
2499 #ifndef PRODUCT
2500 // -Xprintflags
2501 } else if (match_option(option, "-Xprintflags")) {
2502 JVMFlag::printFlags(tty, false);
2503 vm_exit(0);
2504 #endif
2505 // -D
2506 } else if (match_option(option, "-D", &tail)) {
2507 const char* value;
2508 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2509 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2510 // abort if -Djava.endorsed.dirs is set
2511 jio_fprintf(defaultStream::output_stream(),
2512 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2513 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2514 return JNI_EINVAL;
2515 }
2516 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2517 *value != '\0' && strcmp(value, "\"\"") != 0) {
2518 // abort if -Djava.ext.dirs is set
2519 jio_fprintf(defaultStream::output_stream(),
2520 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2521 return JNI_EINVAL;
2522 }
2523 // Check for module related properties. They must be set using the modules
2524 // options. For example: use "--add-modules=java.sql", not
2525 // "-Djdk.module.addmods=java.sql"
2526 if (is_internal_module_property(option->optionString + 2)) {
2527 needs_module_property_warning = true;
2528 continue;
2529 }
2530 if (!add_property(tail)) {
2531 return JNI_ENOMEM;
2532 }
2533 // Out of the box management support
2534 if (match_option(option, "-Dcom.sun.management", &tail)) {
2535 #if INCLUDE_MANAGEMENT
2536 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2537 return JNI_EINVAL;
2538 }
2539 // management agent in module jdk.management.agent
2540 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2541 return JNI_ENOMEM;
2542 }
2543 #else
2544 jio_fprintf(defaultStream::output_stream(),
2545 "-Dcom.sun.management is not supported in this VM.\n");
2546 return JNI_ERR;
2547 #endif
2548 }
2549 // -Xint
2550 } else if (match_option(option, "-Xint")) {
2551 set_mode_flags(_int);
2552 mode_flag_cmd_line = true;
2553 // -Xmixed
2554 } else if (match_option(option, "-Xmixed")) {
2555 set_mode_flags(_mixed);
2556 mode_flag_cmd_line = true;
2557 // -Xcomp
2558 } else if (match_option(option, "-Xcomp")) {
2559 // for testing the compiler; turn off all flags that inhibit compilation
2560 set_mode_flags(_comp);
2561 mode_flag_cmd_line = true;
2562 // -Xshare:dump
2563 } else if (match_option(option, "-Xshare:dump")) {
2564 CDSConfig::enable_dumping_static_archive();
2565 CDSConfig::set_old_cds_flags_used();
2566 // -Xshare:on
2567 } else if (match_option(option, "-Xshare:on")) {
2568 UseSharedSpaces = true;
2569 RequireSharedSpaces = true;
2570 CDSConfig::set_old_cds_flags_used();
2571 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2572 } else if (match_option(option, "-Xshare:auto")) {
2573 UseSharedSpaces = true;
2574 RequireSharedSpaces = false;
2575 xshare_auto_cmd_line = true;
2576 CDSConfig::set_old_cds_flags_used();
2577 // -Xshare:off
2578 } else if (match_option(option, "-Xshare:off")) {
2579 UseSharedSpaces = false;
2580 RequireSharedSpaces = false;
2581 CDSConfig::set_old_cds_flags_used();
2582 // -Xverify
2583 } else if (match_option(option, "-Xverify", &tail)) {
2584 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2585 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2586 return JNI_EINVAL;
2587 }
2588 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2589 return JNI_EINVAL;
2590 }
2591 } else if (strcmp(tail, ":remote") == 0) {
2592 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2593 return JNI_EINVAL;
2594 }
2595 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2596 return JNI_EINVAL;
2597 }
2598 } else if (strcmp(tail, ":none") == 0) {
2599 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2600 return JNI_EINVAL;
2601 }
2602 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2603 return JNI_EINVAL;
2604 }
2605 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2606 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2607 return JNI_EINVAL;
2608 }
2609 // -Xdebug
2610 } else if (match_option(option, "-Xdebug")) {
2611 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2612 } else if (match_option(option, "-Xloggc:", &tail)) {
2613 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2614 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2615 _legacyGCLogging.lastFlag = 2;
2616 _legacyGCLogging.file = os::strdup_check_oom(tail);
2617 } else if (match_option(option, "-Xlog", &tail)) {
2618 bool ret = false;
2619 if (strcmp(tail, ":help") == 0) {
2620 fileStream stream(defaultStream::output_stream());
2621 LogConfiguration::print_command_line_help(&stream);
2622 vm_exit(0);
2623 } else if (strcmp(tail, ":disable") == 0) {
2624 LogConfiguration::disable_logging();
2625 ret = true;
2626 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2627 const char* async_tail = tail + strlen(":async");
2628 ret = LogConfiguration::parse_async_argument(async_tail);
2629 } else if (*tail == '\0') {
2630 ret = LogConfiguration::parse_command_line_arguments();
2631 assert(ret, "-Xlog without arguments should never fail to parse");
2632 } else if (*tail == ':') {
2633 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2634 }
2635 if (ret == false) {
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2638 tail);
2639 return JNI_EINVAL;
2640 }
2641 // JNI hooks
2642 } else if (match_option(option, "-Xcheck", &tail)) {
2643 if (!strcmp(tail, ":jni")) {
2644 #if !INCLUDE_JNI_CHECK
2645 warning("JNI CHECKING is not supported in this VM");
2646 #else
2647 CheckJNICalls = true;
2648 #endif // INCLUDE_JNI_CHECK
2649 } else if (is_bad_option(option, args->ignoreUnrecognized,
2650 "check")) {
2651 return JNI_EINVAL;
2652 }
2653 } else if (match_option(option, "vfprintf")) {
2654 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2655 } else if (match_option(option, "exit")) {
2656 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2657 } else if (match_option(option, "abort")) {
2658 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2659 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2660 // and the last option wins.
2661 } else if (match_option(option, "-XX:+NeverTenure")) {
2662 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2666 return JNI_EINVAL;
2667 }
2668 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2672 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2673 return JNI_EINVAL;
2674 }
2675 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2679 return JNI_EINVAL;
2680 }
2681 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2682 uint max_tenuring_thresh = 0;
2683 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2684 jio_fprintf(defaultStream::error_stream(),
2685 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2686 return JNI_EINVAL;
2687 }
2688
2689 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692
2693 if (MaxTenuringThreshold == 0) {
2694 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2695 return JNI_EINVAL;
2696 }
2697 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 } else {
2701 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 }
2708 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2709 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2710 return JNI_EINVAL;
2711 }
2712 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2716 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2717 return JNI_EINVAL;
2718 }
2719 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2723 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2730 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2734 return JNI_EINVAL;
2735 }
2736 } else if (match_option(option, "--finalization=", &tail)) {
2737 if (strcmp(tail, "enabled") == 0) {
2738 InstanceKlass::set_finalization_enabled(true);
2739 } else if (strcmp(tail, "disabled") == 0) {
2740 InstanceKlass::set_finalization_enabled(false);
2741 } else {
2742 jio_fprintf(defaultStream::error_stream(),
2743 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2744 tail);
2745 return JNI_EINVAL;
2746 }
2747 #if !defined(DTRACE_ENABLED)
2748 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "DTraceMethodProbes flag is not applicable for this configuration\n");
2751 return JNI_EINVAL;
2752 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2753 jio_fprintf(defaultStream::error_stream(),
2754 "DTraceAllocProbes flag is not applicable for this configuration\n");
2755 return JNI_EINVAL;
2756 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2757 jio_fprintf(defaultStream::error_stream(),
2758 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2759 return JNI_EINVAL;
2760 #endif // !defined(DTRACE_ENABLED)
2761 #ifdef ASSERT
2762 } else if (match_option(option, "-XX:+FullGCALot")) {
2763 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 #endif
2767 #if !INCLUDE_MANAGEMENT
2768 } else if (match_option(option, "-XX:+ManagementServer")) {
2769 jio_fprintf(defaultStream::error_stream(),
2770 "ManagementServer is not supported in this VM.\n");
2771 return JNI_ERR;
2772 #endif // INCLUDE_MANAGEMENT
2773 #if INCLUDE_JVMCI
2774 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2775 if (EnableJVMCIProduct) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2778 return JNI_EINVAL;
2779 }
2780 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2781 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2782 if (use_graal_jit) {
2783 const char* jvmci_compiler = get_property("jvmci.Compiler");
2784 if (jvmci_compiler != nullptr) {
2785 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2788 return JNI_ERR;
2789 }
2790 } else if (!add_property("jvmci.Compiler=graal")) {
2791 return JNI_ENOMEM;
2792 }
2793 }
2794
2795 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2796 if (EnableJVMCIProduct) {
2797 continue;
2798 }
2799 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2800 // Allow this flag if it has been unlocked.
2801 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2802 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2803 jio_fprintf(defaultStream::error_stream(),
2804 "Unable to enable JVMCI in product mode\n");
2805 return JNI_ERR;
2806 }
2807 }
2808 // The flag was locked so process normally to report that error
2809 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2810 return JNI_EINVAL;
2811 }
2812 #endif // INCLUDE_JVMCI
2813 #if INCLUDE_JFR
2814 } else if (match_jfr_option(&option)) {
2815 return JNI_EINVAL;
2816 #endif
2817 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2818 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2819 // already been handled
2820 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2821 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2822 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2823 return JNI_EINVAL;
2824 }
2825 }
2826 // Unknown option
2827 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2828 return JNI_ERR;
2829 }
2830 }
2831
2832 // PrintSharedArchiveAndExit will turn on
2833 // -Xshare:on
2834 // -Xlog:class+path=info
2835 if (PrintSharedArchiveAndExit) {
2836 UseSharedSpaces = true;
2837 RequireSharedSpaces = true;
2838 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2839 }
2840
2841 fix_appclasspath();
2842
2843 return JNI_OK;
2844 }
2845
2846 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2847 // For java.base check for duplicate --patch-module options being specified on the command line.
2848 // This check is only required for java.base, all other duplicate module specifications
2849 // will be checked during module system initialization. The module system initialization
2850 // will throw an ExceptionInInitializerError if this situation occurs.
2851 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2852 if (patch_mod_javabase) {
2853 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2854 } else {
2855 patch_mod_javabase = true;
2856 }
2857 }
2858
2859 // Create GrowableArray lazily, only if --patch-module has been specified
2860 if (_patch_mod_prefix == nullptr) {
2861 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2862 }
2863
2864 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2865 }
2866
2867 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2868 //
2869 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2870 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2871 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2872 // path is treated as the current directory.
2873 //
2874 // This causes problems with CDS, which requires that all directories specified in the classpath
2875 // must be empty. In most cases, applications do NOT want to load classes from the current
2876 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2877 // scripts compatible with CDS.
2878 void Arguments::fix_appclasspath() {
2879 if (IgnoreEmptyClassPaths) {
2880 const char separator = *os::path_separator();
2881 const char* src = _java_class_path->value();
2882
2883 // skip over all the leading empty paths
2884 while (*src == separator) {
2885 src ++;
2886 }
2887
2888 char* copy = os::strdup_check_oom(src, mtArguments);
2889
2890 // trim all trailing empty paths
2891 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2892 *tail = '\0';
2893 }
2894
2895 char from[3] = {separator, separator, '\0'};
2896 char to [2] = {separator, '\0'};
2897 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2898 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2899 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2900 }
2901
2902 _java_class_path->set_writeable_value(copy);
2903 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2904 }
2905 }
2906
2907 jint Arguments::finalize_vm_init_args() {
2908 // check if the default lib/endorsed directory exists; if so, error
2909 char path[JVM_MAXPATHLEN];
2910 const char* fileSep = os::file_separator();
2911 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2912
2913 DIR* dir = os::opendir(path);
2914 if (dir != nullptr) {
2915 jio_fprintf(defaultStream::output_stream(),
2916 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2917 "in modular form will be supported via the concept of upgradeable modules.\n");
2918 os::closedir(dir);
2919 return JNI_ERR;
2920 }
2921
2922 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2923 dir = os::opendir(path);
2924 if (dir != nullptr) {
2925 jio_fprintf(defaultStream::output_stream(),
2926 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2927 "Use -classpath instead.\n.");
2928 os::closedir(dir);
2929 return JNI_ERR;
2930 }
2931
2932 // This must be done after all arguments have been processed
2933 // and the container support has been initialized since AggressiveHeap
2934 // relies on the amount of total memory available.
2935 if (AggressiveHeap) {
2936 jint result = set_aggressive_heap_flags();
2937 if (result != JNI_OK) {
2938 return result;
2939 }
2940 }
2941
2942 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2943 // but like -Xint, leave compilation thresholds unaffected.
2944 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2945 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2946 set_mode_flags(_int);
2947 }
2948
2949 #ifdef ZERO
2950 // Zero always runs in interpreted mode
2951 set_mode_flags(_int);
2952 #endif
2953
2954 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2955 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2956 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2957 }
2958
2959 #if !COMPILER2_OR_JVMCI
2960 // Don't degrade server performance for footprint
2961 if (FLAG_IS_DEFAULT(UseLargePages) &&
2962 MaxHeapSize < LargePageHeapSizeThreshold) {
2963 // No need for large granularity pages w/small heaps.
2964 // Note that large pages are enabled/disabled for both the
2965 // Java heap and the code cache.
2966 FLAG_SET_DEFAULT(UseLargePages, false);
2967 }
2968
2969 UNSUPPORTED_OPTION(ProfileInterpreter);
2970 #endif
2971
2972 // Parse the CompilationMode flag
2973 if (!CompilationModeFlag::initialize()) {
2974 return JNI_ERR;
2975 }
2976
2977 if (!check_vm_args_consistency()) {
2978 return JNI_ERR;
2979 }
2980
2981
2982 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2983 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2984 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2985
2986 return JNI_OK;
2987 }
2988
2989 // Helper class for controlling the lifetime of JavaVMInitArgs
2990 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2991 // deleted on the destruction of the ScopedVMInitArgs object.
2992 class ScopedVMInitArgs : public StackObj {
2993 private:
2994 JavaVMInitArgs _args;
2995 char* _container_name;
2996 bool _is_set;
2997 char* _vm_options_file_arg;
2998
2999 public:
3000 ScopedVMInitArgs(const char *container_name) {
3001 _args.version = JNI_VERSION_1_2;
3002 _args.nOptions = 0;
3003 _args.options = nullptr;
3004 _args.ignoreUnrecognized = false;
3005 _container_name = (char *)container_name;
3006 _is_set = false;
3007 _vm_options_file_arg = nullptr;
3008 }
3009
3010 // Populates the JavaVMInitArgs object represented by this
3011 // ScopedVMInitArgs object with the arguments in options. The
3012 // allocated memory is deleted by the destructor. If this method
3013 // returns anything other than JNI_OK, then this object is in a
3014 // partially constructed state, and should be abandoned.
3015 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3016 _is_set = true;
3017 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3018 JavaVMOption, options->length(), mtArguments);
3019 if (options_arr == nullptr) {
3020 return JNI_ENOMEM;
3021 }
3022 _args.options = options_arr;
3023
3024 for (int i = 0; i < options->length(); i++) {
3025 options_arr[i] = options->at(i);
3026 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3027 if (options_arr[i].optionString == nullptr) {
3028 // Rely on the destructor to do cleanup.
3029 _args.nOptions = i;
3030 return JNI_ENOMEM;
3031 }
3032 }
3033
3034 _args.nOptions = options->length();
3035 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3036 return JNI_OK;
3037 }
3038
3039 JavaVMInitArgs* get() { return &_args; }
3040 char* container_name() { return _container_name; }
3041 bool is_set() { return _is_set; }
3042 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3043 char* vm_options_file_arg() { return _vm_options_file_arg; }
3044
3045 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3046 if (_vm_options_file_arg != nullptr) {
3047 os::free(_vm_options_file_arg);
3048 }
3049 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3050 }
3051
3052 ~ScopedVMInitArgs() {
3053 if (_vm_options_file_arg != nullptr) {
3054 os::free(_vm_options_file_arg);
3055 }
3056 if (_args.options == nullptr) return;
3057 for (int i = 0; i < _args.nOptions; i++) {
3058 os::free(_args.options[i].optionString);
3059 }
3060 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3061 }
3062
3063 // Insert options into this option list, to replace option at
3064 // vm_options_file_pos (-XX:VMOptionsFile)
3065 jint insert(const JavaVMInitArgs* args,
3066 const JavaVMInitArgs* args_to_insert,
3067 const int vm_options_file_pos) {
3068 assert(_args.options == nullptr, "shouldn't be set yet");
3069 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3070 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3071
3072 int length = args->nOptions + args_to_insert->nOptions - 1;
3073 // Construct new option array
3074 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3075 for (int i = 0; i < args->nOptions; i++) {
3076 if (i == vm_options_file_pos) {
3077 // insert the new options starting at the same place as the
3078 // -XX:VMOptionsFile option
3079 for (int j = 0; j < args_to_insert->nOptions; j++) {
3080 options.push(args_to_insert->options[j]);
3081 }
3082 } else {
3083 options.push(args->options[i]);
3084 }
3085 }
3086 // make into options array
3087 return set_args(&options);
3088 }
3089 };
3090
3091 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3092 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3093 }
3094
3095 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3096 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3097 }
3098
3099 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3100 for (int index = args->nOptions - 1; index >= 0; index--) {
3101 JavaVMOption* option = args->options + index;
3102 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3103 return option;
3104 }
3105 }
3106
3107 return nullptr;
3108 }
3109
3110 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3111 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3112 // Don't bother scanning all the args if this env variable is not set
3113 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3114 return JNI_OK;
3115 }
3116
3117 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3118 // of AOTMode.
3119 JavaVMOption* option = nullptr;
3120 for (int i = all_args->length() - 1; i >= 0; i--) {
3121 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3122 break;
3123 }
3124 }
3125
3126 if (option != nullptr) {
3127 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3128 // so its value is not reflected inside the global variable AOTMode.
3129 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3130 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3131 }
3132 } else {
3133 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3134 // which would have been set inside process_settings_file();
3135 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3136 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3137 }
3138 }
3139
3140 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3141 }
3142
3143 jint Arguments::parse_options_environment_variable(const char* name,
3144 ScopedVMInitArgs* vm_args) {
3145 char *buffer = ::getenv(name);
3146
3147 // Don't check this environment variable if user has special privileges
3148 // (e.g. unix su command).
3149 if (buffer == nullptr || os::have_special_privileges()) {
3150 return JNI_OK;
3151 }
3152
3153 if ((buffer = os::strdup(buffer)) == nullptr) {
3154 return JNI_ENOMEM;
3155 }
3156
3157 jio_fprintf(defaultStream::error_stream(),
3158 "Picked up %s: %s\n", name, buffer);
3159
3160 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3161
3162 os::free(buffer);
3163 return retcode;
3164 }
3165
3166 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3167 // read file into buffer
3168 int fd = ::open(file_name, O_RDONLY);
3169 if (fd < 0) {
3170 jio_fprintf(defaultStream::error_stream(),
3171 "Could not open options file '%s'\n",
3172 file_name);
3173 return JNI_ERR;
3174 }
3175
3176 struct stat stbuf;
3177 int retcode = os::stat(file_name, &stbuf);
3178 if (retcode != 0) {
3179 jio_fprintf(defaultStream::error_stream(),
3180 "Could not stat options file '%s'\n",
3181 file_name);
3182 ::close(fd);
3183 return JNI_ERR;
3184 }
3185
3186 if (stbuf.st_size == 0) {
3187 // tell caller there is no option data and that is ok
3188 ::close(fd);
3189 return JNI_OK;
3190 }
3191
3192 // '+ 1' for null termination even with max bytes
3193 size_t bytes_alloc = stbuf.st_size + 1;
3194
3195 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3196 if (nullptr == buf) {
3197 jio_fprintf(defaultStream::error_stream(),
3198 "Could not allocate read buffer for options file parse\n");
3199 ::close(fd);
3200 return JNI_ENOMEM;
3201 }
3202
3203 memset(buf, 0, bytes_alloc);
3204
3205 // Fill buffer
3206 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3207 ::close(fd);
3208 if (bytes_read < 0) {
3209 FREE_C_HEAP_ARRAY(char, buf);
3210 jio_fprintf(defaultStream::error_stream(),
3211 "Could not read options file '%s'\n", file_name);
3212 return JNI_ERR;
3213 }
3214
3215 if (bytes_read == 0) {
3216 // tell caller there is no option data and that is ok
3217 FREE_C_HEAP_ARRAY(char, buf);
3218 return JNI_OK;
3219 }
3220
3221 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3222
3223 FREE_C_HEAP_ARRAY(char, buf);
3224 return retcode;
3225 }
3226
3227 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3228 // Construct option array
3229 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3230
3231 // some pointers to help with parsing
3232 char *buffer_end = buffer + buf_len;
3233 char *opt_hd = buffer;
3234 char *wrt = buffer;
3235 char *rd = buffer;
3236
3237 // parse all options
3238 while (rd < buffer_end) {
3239 // skip leading white space from the input string
3240 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3241 rd++;
3242 }
3243
3244 if (rd >= buffer_end) {
3245 break;
3246 }
3247
3248 // Remember this is where we found the head of the token.
3249 opt_hd = wrt;
3250
3251 // Tokens are strings of non white space characters separated
3252 // by one or more white spaces.
3253 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3254 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3255 int quote = *rd; // matching quote to look for
3256 rd++; // don't copy open quote
3257 while (rd < buffer_end && *rd != quote) {
3258 // include everything (even spaces)
3259 // up until the close quote
3260 *wrt++ = *rd++; // copy to option string
3261 }
3262
3263 if (rd < buffer_end) {
3264 rd++; // don't copy close quote
3265 } else {
3266 // did not see closing quote
3267 jio_fprintf(defaultStream::error_stream(),
3268 "Unmatched quote in %s\n", name);
3269 return JNI_ERR;
3270 }
3271 } else {
3272 *wrt++ = *rd++; // copy to option string
3273 }
3274 }
3275
3276 // steal a white space character and set it to null
3277 *wrt++ = '\0';
3278 // We now have a complete token
3279
3280 JavaVMOption option;
3281 option.optionString = opt_hd;
3282 option.extraInfo = nullptr;
3283
3284 options.append(option); // Fill in option
3285
3286 rd++; // Advance to next character
3287 }
3288
3289 // Fill out JavaVMInitArgs structure.
3290 return vm_args->set_args(&options);
3291 }
3292
3293 #ifndef PRODUCT
3294 // Determine whether LogVMOutput should be implicitly turned on.
3295 static bool use_vm_log() {
3296 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3297 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3298 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3299 PrintAssembly || TraceDeoptimization ||
3300 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3301 return true;
3302 }
3303
3304 #ifdef COMPILER1
3305 if (PrintC1Statistics) {
3306 return true;
3307 }
3308 #endif // COMPILER1
3309
3310 #ifdef COMPILER2
3311 if (PrintOptoAssembly || PrintOptoStatistics) {
3312 return true;
3313 }
3314 #endif // COMPILER2
3315
3316 return false;
3317 }
3318
3319 #endif // PRODUCT
3320
3321 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3322 for (int index = 0; index < args->nOptions; index++) {
3323 const JavaVMOption* option = args->options + index;
3324 const char* tail;
3325 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3326 return true;
3327 }
3328 }
3329 return false;
3330 }
3331
3332 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3333 const char* vm_options_file,
3334 const int vm_options_file_pos,
3335 ScopedVMInitArgs* vm_options_file_args,
3336 ScopedVMInitArgs* args_out) {
3337 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3338 if (code != JNI_OK) {
3339 return code;
3340 }
3341
3342 if (vm_options_file_args->get()->nOptions < 1) {
3343 return JNI_OK;
3344 }
3345
3346 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3347 jio_fprintf(defaultStream::error_stream(),
3348 "A VM options file may not refer to a VM options file. "
3349 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3350 "options file '%s' in options container '%s' is an error.\n",
3351 vm_options_file_args->vm_options_file_arg(),
3352 vm_options_file_args->container_name());
3353 return JNI_EINVAL;
3354 }
3355
3356 return args_out->insert(args, vm_options_file_args->get(),
3357 vm_options_file_pos);
3358 }
3359
3360 // Expand -XX:VMOptionsFile found in args_in as needed.
3361 // mod_args and args_out parameters may return values as needed.
3362 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3363 ScopedVMInitArgs* mod_args,
3364 JavaVMInitArgs** args_out) {
3365 jint code = match_special_option_and_act(args_in, mod_args);
3366 if (code != JNI_OK) {
3367 return code;
3368 }
3369
3370 if (mod_args->is_set()) {
3371 // args_in contains -XX:VMOptionsFile and mod_args contains the
3372 // original options from args_in along with the options expanded
3373 // from the VMOptionsFile. Return a short-hand to the caller.
3374 *args_out = mod_args->get();
3375 } else {
3376 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3377 }
3378 return JNI_OK;
3379 }
3380
3381 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3382 ScopedVMInitArgs* args_out) {
3383 // Remaining part of option string
3384 const char* tail;
3385 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3386
3387 for (int index = 0; index < args->nOptions; index++) {
3388 const JavaVMOption* option = args->options + index;
3389 if (match_option(option, "-XX:Flags=", &tail)) {
3390 Arguments::set_jvm_flags_file(tail);
3391 continue;
3392 }
3393 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3394 if (vm_options_file_args.found_vm_options_file_arg()) {
3395 jio_fprintf(defaultStream::error_stream(),
3396 "The option '%s' is already specified in the options "
3397 "container '%s' so the specification of '%s' in the "
3398 "same options container is an error.\n",
3399 vm_options_file_args.vm_options_file_arg(),
3400 vm_options_file_args.container_name(),
3401 option->optionString);
3402 return JNI_EINVAL;
3403 }
3404 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3405 // If there's a VMOptionsFile, parse that
3406 jint code = insert_vm_options_file(args, tail, index,
3407 &vm_options_file_args, args_out);
3408 if (code != JNI_OK) {
3409 return code;
3410 }
3411 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3412 if (args_out->is_set()) {
3413 // The VMOptions file inserted some options so switch 'args'
3414 // to the new set of options, and continue processing which
3415 // preserves "last option wins" semantics.
3416 args = args_out->get();
3417 // The first option from the VMOptionsFile replaces the
3418 // current option. So we back track to process the
3419 // replacement option.
3420 index--;
3421 }
3422 continue;
3423 }
3424 if (match_option(option, "-XX:+PrintVMOptions")) {
3425 PrintVMOptions = true;
3426 continue;
3427 }
3428 if (match_option(option, "-XX:-PrintVMOptions")) {
3429 PrintVMOptions = false;
3430 continue;
3431 }
3432 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3433 IgnoreUnrecognizedVMOptions = true;
3434 continue;
3435 }
3436 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3437 IgnoreUnrecognizedVMOptions = false;
3438 continue;
3439 }
3440 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3441 JVMFlag::printFlags(tty, false);
3442 vm_exit(0);
3443 }
3444
3445 #ifndef PRODUCT
3446 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3447 JVMFlag::printFlags(tty, true);
3448 vm_exit(0);
3449 }
3450 #endif
3451 }
3452 return JNI_OK;
3453 }
3454
3455 static void print_options(const JavaVMInitArgs *args) {
3456 const char* tail;
3457 for (int index = 0; index < args->nOptions; index++) {
3458 const JavaVMOption *option = args->options + index;
3459 if (match_option(option, "-XX:", &tail)) {
3460 logOption(tail);
3461 }
3462 }
3463 }
3464
3465 bool Arguments::handle_deprecated_print_gc_flags() {
3466 if (PrintGC) {
3467 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3468 }
3469 if (PrintGCDetails) {
3470 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3471 }
3472
3473 if (_legacyGCLogging.lastFlag == 2) {
3474 // -Xloggc was used to specify a filename
3475 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3476
3477 LogTarget(Error, logging) target;
3478 LogStream errstream(target);
3479 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3480 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3481 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3482 }
3483 return true;
3484 }
3485
3486 static void apply_debugger_ergo() {
3487 #ifdef ASSERT
3488 if (ReplayCompiles) {
3489 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3490 }
3491
3492 if (UseDebuggerErgo) {
3493 // Turn on sub-flags
3494 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3495 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3496 }
3497
3498 if (UseDebuggerErgo2) {
3499 // Debugging with limited number of CPUs
3500 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3501 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3502 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3503 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3504 }
3505 #endif // ASSERT
3506 }
3507
3508 // Parse entry point called from JNI_CreateJavaVM
3509
3510 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3511 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3512 JVMFlag::check_all_flag_declarations();
3513
3514 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3515 const char* hotspotrc = ".hotspotrc";
3516 bool settings_file_specified = false;
3517 bool needs_hotspotrc_warning = false;
3518 ScopedVMInitArgs initial_vm_options_args("");
3519 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3520 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3521 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3522
3523 // Pointers to current working set of containers
3524 JavaVMInitArgs* cur_cmd_args;
3525 JavaVMInitArgs* cur_vm_options_args;
3526 JavaVMInitArgs* cur_java_options_args;
3527 JavaVMInitArgs* cur_java_tool_options_args;
3528 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3529
3530 // Containers for modified/expanded options
3531 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3532 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3533 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3534 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3535 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3536
3537 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3538
3539 jint code =
3540 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3541 if (code != JNI_OK) {
3542 return code;
3543 }
3544
3545 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3546 // This is an undocumented feature.
3547 code = parse_java_options_environment_variable(&initial_java_options_args);
3548 if (code != JNI_OK) {
3549 return code;
3550 }
3551
3552 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3553 char *vmoptions = ClassLoader::lookup_vm_options();
3554 if (vmoptions != nullptr) {
3555 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3556 FREE_C_HEAP_ARRAY(char, vmoptions);
3557 if (code != JNI_OK) {
3558 return code;
3559 }
3560 }
3561
3562 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3563 &mod_java_tool_options_args,
3564 &cur_java_tool_options_args);
3565 if (code != JNI_OK) {
3566 return code;
3567 }
3568
3569 code = expand_vm_options_as_needed(initial_cmd_args,
3570 &mod_cmd_args,
3571 &cur_cmd_args);
3572 if (code != JNI_OK) {
3573 return code;
3574 }
3575
3576 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3577 &mod_java_options_args,
3578 &cur_java_options_args);
3579 if (code != JNI_OK) {
3580 return code;
3581 }
3582
3583 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3584 &mod_vm_options_args,
3585 &cur_vm_options_args);
3586 if (code != JNI_OK) {
3587 return code;
3588 }
3589
3590 const char* flags_file = Arguments::get_jvm_flags_file();
3591 settings_file_specified = (flags_file != nullptr);
3592
3593 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3594 if (settings_file_specified) {
3595 if (!process_settings_file(flags_file, true,
3596 IgnoreUnrecognizedVMOptions)) {
3597 return JNI_EINVAL;
3598 }
3599 } else {
3600 #ifdef ASSERT
3601 // Parse default .hotspotrc settings file
3602 if (!process_settings_file(".hotspotrc", false,
3603 IgnoreUnrecognizedVMOptions)) {
3604 return JNI_EINVAL;
3605 }
3606 #else
3607 struct stat buf;
3608 if (os::stat(hotspotrc, &buf) == 0) {
3609 needs_hotspotrc_warning = true;
3610 }
3611 #endif
3612 }
3613
3614 // The settings in the args are applied in this order to the the JVM global flags.
3615 // For historical reasons, the order is DIFFERENT than the scanning order of
3616 // the above expand_vm_options_as_needed() calls.
3617 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3618 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3619 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3620 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3621
3622 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3623 // the options that have been gathered above.
3624 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3625 if (code != JNI_OK) {
3626 return code;
3627 }
3628 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3629 &mod_jdk_aot_vm_options_args,
3630 &cur_jdk_aot_vm_options_args);
3631 if (code != JNI_OK) {
3632 return code;
3633 }
3634
3635 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3636 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3637 const char* optionString = option->optionString;
3638 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3639 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3640 jio_fprintf(defaultStream::error_stream(),
3641 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3642 return JNI_ERR;
3643 }
3644 }
3645
3646 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3647
3648 if (IgnoreUnrecognizedVMOptions) {
3649 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3650 // the JDK so it shouldn't have bad options.
3651 cur_cmd_args->ignoreUnrecognized = true;
3652 cur_java_tool_options_args->ignoreUnrecognized = true;
3653 cur_java_options_args->ignoreUnrecognized = true;
3654 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3655 }
3656
3657 if (PrintVMOptions) {
3658 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3659 print_options(cur_java_tool_options_args);
3660 print_options(cur_cmd_args);
3661 print_options(cur_java_options_args);
3662 print_options(cur_jdk_aot_vm_options_args);
3663 }
3664
3665 // Apply the settings in these args to the JVM global flags.
3666 jint result = parse_vm_init_args(&all_args);
3667
3668 if (result != JNI_OK) {
3669 return result;
3670 }
3671
3672 // Delay warning until here so that we've had a chance to process
3673 // the -XX:-PrintWarnings flag
3674 if (needs_hotspotrc_warning) {
3675 warning("%s file is present but has been ignored. "
3676 "Run with -XX:Flags=%s to load the file.",
3677 hotspotrc, hotspotrc);
3678 }
3679
3680 if (needs_module_property_warning) {
3681 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3682 " names that are reserved for internal use.");
3683 }
3684
3685 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3686 UNSUPPORTED_OPTION(UseLargePages);
3687 #endif
3688
3689 #if defined(AIX)
3690 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3691 #endif
3692
3693 #ifndef PRODUCT
3694 if (TraceBytecodesAt != 0) {
3695 TraceBytecodes = true;
3696 }
3697 #endif // PRODUCT
3698
3699 if (ScavengeRootsInCode == 0) {
3700 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3701 warning("Forcing ScavengeRootsInCode non-zero");
3702 }
3703 ScavengeRootsInCode = 1;
3704 }
3705
3706 if (!handle_deprecated_print_gc_flags()) {
3707 return JNI_EINVAL;
3708 }
3709
3710 // Set object alignment values.
3711 set_object_alignment();
3712
3713 #if !INCLUDE_CDS
3714 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3715 jio_fprintf(defaultStream::error_stream(),
3716 "Shared spaces are not supported in this VM\n");
3717 return JNI_ERR;
3718 }
3719 if (DumpLoadedClassList != nullptr) {
3720 jio_fprintf(defaultStream::error_stream(),
3721 "DumpLoadedClassList is not supported in this VM\n");
3722 return JNI_ERR;
3723 }
3724 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3725 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3726 warning("Shared spaces are not supported in this VM");
3727 UseSharedSpaces = false;
3728 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3729 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3730 }
3731 no_shared_spaces("CDS Disabled");
3732 #endif // INCLUDE_CDS
3733
3734 // Verify NMT arguments
3735 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3736 if (lvl == NMT_unknown) {
3737 jio_fprintf(defaultStream::error_stream(),
3738 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3739 return JNI_ERR;
3740 }
3741 if (PrintNMTStatistics && lvl == NMT_off) {
3742 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3743 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3744 }
3745
3746 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3747 if (trace_dependencies && VerifyDependencies) {
3748 warning("dependency logging results may be inflated by VerifyDependencies");
3749 }
3750
3751 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3752 log_is_enabled(Info, class, load, cause);
3753 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3754 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3755 }
3756
3757 apply_debugger_ergo();
3758
3759 // The VMThread needs to stop now and then to execute these debug options.
3760 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3761 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3762 }
3763
3764 if (log_is_enabled(Info, arguments)) {
3765 LogStream st(Log(arguments)::info());
3766 Arguments::print_on(&st);
3767 }
3768
3769 return JNI_OK;
3770 }
3771
3772 void Arguments::set_compact_headers_flags() {
3773 #ifdef _LP64
3774 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3775 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3776 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3777 }
3778 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3779 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3780 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3781 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3782
3783 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3784 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3785 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3786 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3787 } else {
3788 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3789 }
3790 }
3791 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3792 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3793 }
3794 #endif
3795 }
3796
3797 jint Arguments::apply_ergo() {
3798 // Set flags based on ergonomics.
3799 jint result = set_ergonomics_flags();
3800 if (result != JNI_OK) return result;
3801
3802 // Set heap size based on available physical memory
3803 set_heap_size();
3804
3805 GCConfig::arguments()->initialize();
3806
3807 set_compact_headers_flags();
3808
3809 if (UseCompressedClassPointers) {
3810 CompressedKlassPointers::pre_initialize();
3811 }
3812
3813 CDSConfig::ergo_initialize();
3814
3815 // Initialize Metaspace flags and alignments
3816 Metaspace::ergo_initialize();
3817
3818 if (!StringDedup::ergo_initialize()) {
3819 return JNI_EINVAL;
3820 }
3821
3822 // Set compiler flags after GC is selected and GC specific
3823 // flags (LoopStripMiningIter) are set.
3824 CompilerConfig::ergo_initialize();
3825
3826 // Set bytecode rewriting flags
3827 set_bytecode_flags();
3828
3829 // Set flags if aggressive optimization flags are enabled
3830 jint code = set_aggressive_opts_flags();
3831 if (code != JNI_OK) {
3832 return code;
3833 }
3834
3835 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3836 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3837 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3838 warning("UseSecondarySupersTable is not supported");
3839 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3840 }
3841 if (!UseSecondarySupersTable) {
3842 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3843 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3844 }
3845
3846 #ifdef ZERO
3847 // Clear flags not supported on zero.
3848 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3849 #endif // ZERO
3850
3851 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3852 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3853 DebugNonSafepoints = true;
3854 }
3855
3856 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3857 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3858 }
3859
3860 // Treat the odd case where local verification is enabled but remote
3861 // verification is not as if both were enabled.
3862 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3863 log_info(verification)("Turning on remote verification because local verification is on");
3864 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3865 }
3866
3867 #ifndef PRODUCT
3868 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3869 if (use_vm_log()) {
3870 LogVMOutput = true;
3871 }
3872 }
3873 #endif // PRODUCT
3874
3875 if (PrintCommandLineFlags) {
3876 JVMFlag::printSetFlags(tty);
3877 }
3878
3879 #if COMPILER2_OR_JVMCI
3880 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3881 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3882 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3883 }
3884 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3885
3886 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3887 if (!EnableVectorReboxing) {
3888 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3889 } else {
3890 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3891 }
3892 }
3893 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3894 }
3895 #endif // COMPILER2_OR_JVMCI
3896
3897 #ifdef COMPILER2
3898 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3899 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3900 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3901 }
3902 #endif // COMPILER2
3903
3904 if (log_is_enabled(Info, perf, class, link)) {
3905 if (!UsePerfData) {
3906 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3907 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3908 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3909 }
3910 }
3911
3912 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3913 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3914 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3915 }
3916 }
3917 return JNI_OK;
3918 }
3919
3920 jint Arguments::adjust_after_os() {
3921 if (UseNUMA) {
3922 if (UseParallelGC) {
3923 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3924 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3925 }
3926 }
3927 }
3928 return JNI_OK;
3929 }
3930
3931 int Arguments::PropertyList_count(SystemProperty* pl) {
3932 int count = 0;
3933 while(pl != nullptr) {
3934 count++;
3935 pl = pl->next();
3936 }
3937 return count;
3938 }
3939
3940 // Return the number of readable properties.
3941 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3942 int count = 0;
3943 while(pl != nullptr) {
3944 if (pl->readable()) {
3945 count++;
3946 }
3947 pl = pl->next();
3948 }
3949 return count;
3950 }
3951
3952 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3953 assert(key != nullptr, "just checking");
3954 SystemProperty* prop;
3955 for (prop = pl; prop != nullptr; prop = prop->next()) {
3956 if (strcmp(key, prop->key()) == 0) return prop->value();
3957 }
3958 return nullptr;
3959 }
3960
3961 // Return the value of the requested property provided that it is a readable property.
3962 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3963 assert(key != nullptr, "just checking");
3964 SystemProperty* prop;
3965 // Return the property value if the keys match and the property is not internal or
3966 // it's the special internal property "jdk.boot.class.path.append".
3967 for (prop = pl; prop != nullptr; prop = prop->next()) {
3968 if (strcmp(key, prop->key()) == 0) {
3969 if (!prop->internal()) {
3970 return prop->value();
3971 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3972 return prop->value();
3973 } else {
3974 // Property is internal and not jdk.boot.class.path.append so return null.
3975 return nullptr;
3976 }
3977 }
3978 }
3979 return nullptr;
3980 }
3981
3982 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3983 SystemProperty* p = *plist;
3984 if (p == nullptr) {
3985 *plist = new_p;
3986 } else {
3987 while (p->next() != nullptr) {
3988 p = p->next();
3989 }
3990 p->set_next(new_p);
3991 }
3992 }
3993
3994 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3995 bool writeable, bool internal) {
3996 if (plist == nullptr)
3997 return;
3998
3999 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4000 PropertyList_add(plist, new_p);
4001 }
4002
4003 void Arguments::PropertyList_add(SystemProperty *element) {
4004 PropertyList_add(&_system_properties, element);
4005 }
4006
4007 // This add maintains unique property key in the list.
4008 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4009 PropertyAppendable append, PropertyWriteable writeable,
4010 PropertyInternal internal) {
4011 if (plist == nullptr)
4012 return;
4013
4014 // If property key exists and is writeable, then update with new value.
4015 // Trying to update a non-writeable property is silently ignored.
4016 SystemProperty* prop;
4017 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4018 if (strcmp(k, prop->key()) == 0) {
4019 if (append == AppendProperty) {
4020 prop->append_writeable_value(v);
4021 } else {
4022 prop->set_writeable_value(v);
4023 }
4024 return;
4025 }
4026 }
4027
4028 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4029 }
4030
4031 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4032 // Returns true if all of the source pointed by src has been copied over to
4033 // the destination buffer pointed by buf. Otherwise, returns false.
4034 // Notes:
4035 // 1. If the length (buflen) of the destination buffer excluding the
4036 // null terminator character is not long enough for holding the expanded
4037 // pid characters, it also returns false instead of returning the partially
4038 // expanded one.
4039 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4040 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4041 char* buf, size_t buflen) {
4042 const char* p = src;
4043 char* b = buf;
4044 const char* src_end = &src[srclen];
4045 char* buf_end = &buf[buflen - 1];
4046
4047 while (p < src_end && b < buf_end) {
4048 if (*p == '%') {
4049 switch (*(++p)) {
4050 case '%': // "%%" ==> "%"
4051 *b++ = *p++;
4052 break;
4053 case 'p': { // "%p" ==> current process id
4054 // buf_end points to the character before the last character so
4055 // that we could write '\0' to the end of the buffer.
4056 size_t buf_sz = buf_end - b + 1;
4057 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4058
4059 // if jio_snprintf fails or the buffer is not long enough to hold
4060 // the expanded pid, returns false.
4061 if (ret < 0 || ret >= (int)buf_sz) {
4062 return false;
4063 } else {
4064 b += ret;
4065 assert(*b == '\0', "fail in copy_expand_pid");
4066 if (p == src_end && b == buf_end + 1) {
4067 // reach the end of the buffer.
4068 return true;
4069 }
4070 }
4071 p++;
4072 break;
4073 }
4074 default :
4075 *b++ = '%';
4076 }
4077 } else {
4078 *b++ = *p++;
4079 }
4080 }
4081 *b = '\0';
4082 return (p == src_end); // return false if not all of the source was copied
4083 }