1 /*
2 * Copyright (c) 1997, 2023, 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 "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/filemap.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "gc/shared/gcArguments.hpp"
35 #include "gc/shared/gcConfig.hpp"
36 #include "gc/shared/stringdedup/stringDedup.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "jvm.h"
39 #include "logging/log.hpp"
40 #include "logging/logConfiguration.hpp"
41 #include "logging/logStream.hpp"
42 #include "logging/logTag.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/jvmtiAgentList.hpp"
47 #include "prims/jvmtiExport.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/flags/jvmFlag.hpp"
50 #include "runtime/flags/jvmFlagAccess.hpp"
51 #include "runtime/flags/jvmFlagLimit.hpp"
52 #include "runtime/globals_extension.hpp"
53 #include "runtime/java.hpp"
54 #include "runtime/os.hpp"
55 #include "runtime/safepoint.hpp"
56 #include "runtime/safepointMechanism.hpp"
57 #include "runtime/synchronizer.hpp"
58 #include "runtime/vm_version.hpp"
59 #include "services/management.hpp"
60 #include "services/nmtCommon.hpp"
61 #include "utilities/align.hpp"
62 #include "utilities/debug.hpp"
63 #include "utilities/defaultStream.hpp"
64 #include "utilities/macros.hpp"
65 #include "utilities/parseInteger.hpp"
66 #include "utilities/powerOfTwo.hpp"
67 #include "utilities/stringUtils.hpp"
68 #include "utilities/systemMemoryBarrier.hpp"
69 #if INCLUDE_JFR
70 #include "jfr/jfr.hpp"
71 #endif
72
73 #include <limits>
74
75 static const char _default_java_launcher[] = "generic";
76
77 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
78
79 char* Arguments::_jvm_flags_file = nullptr;
80 char** Arguments::_jvm_flags_array = nullptr;
81 int Arguments::_num_jvm_flags = 0;
82 char** Arguments::_jvm_args_array = nullptr;
83 int Arguments::_num_jvm_args = 0;
84 char* Arguments::_java_command = nullptr;
85 SystemProperty* Arguments::_system_properties = nullptr;
86 size_t Arguments::_conservative_max_heap_alignment = 0;
87 Arguments::Mode Arguments::_mode = _mixed;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = nullptr;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 bool Arguments::_sun_java_launcher_is_altjvm = false;
92
93 // These parameters are reset in method parse_vm_init_args()
94 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
95 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
96 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
97 bool Arguments::_ClipInlining = ClipInlining;
98 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
99
100 bool Arguments::_enable_preview = false;
101
102 char* Arguments::_default_shared_archive_path = nullptr;
103 char* Arguments::SharedArchivePath = nullptr;
104 char* Arguments::SharedDynamicArchivePath = nullptr;
105
106 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
107
108 // These are not set by the JDK's built-in launchers, but they can be set by
109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
110 // JavaVMOption in jni.h.
111 abort_hook_t Arguments::_abort_hook = nullptr;
112 exit_hook_t Arguments::_exit_hook = nullptr;
113 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
114
115
116 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
117 SystemProperty *Arguments::_java_library_path = nullptr;
118 SystemProperty *Arguments::_java_home = nullptr;
119 SystemProperty *Arguments::_java_class_path = nullptr;
120 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
121 SystemProperty *Arguments::_vm_info = nullptr;
122
123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
124 PathString *Arguments::_boot_class_path = nullptr;
125 bool Arguments::_has_jimage = false;
126
127 char* Arguments::_ext_dirs = nullptr;
128
129 // True if -Xshare:auto option was specified.
130 static bool xshare_auto_cmd_line = false;
131
132 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
133 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
134 if (new_value == nullptr) {
135 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
136 return false;
137 }
138 if (_value != nullptr) {
139 FreeHeap(_value);
140 }
141 _value = new_value;
142 strcpy(_value, value);
143 return true;
144 }
145
146 void PathString::append_value(const char *value) {
147 char *sp;
148 size_t len = 0;
149 if (value != nullptr) {
150 len = strlen(value);
151 if (_value != nullptr) {
152 len += strlen(_value);
153 }
154 sp = AllocateHeap(len+2, mtArguments);
155 assert(sp != nullptr, "Unable to allocate space for new append path value");
156 if (sp != nullptr) {
157 if (_value != nullptr) {
158 strcpy(sp, _value);
159 strcat(sp, os::path_separator());
160 strcat(sp, value);
161 FreeHeap(_value);
162 } else {
163 strcpy(sp, value);
164 }
165 _value = sp;
166 }
167 }
168 }
169
170 PathString::PathString(const char* value) {
171 if (value == nullptr) {
172 _value = nullptr;
173 } else {
174 _value = AllocateHeap(strlen(value)+1, mtArguments);
175 strcpy(_value, value);
176 }
177 }
178
179 PathString::~PathString() {
180 if (_value != nullptr) {
181 FreeHeap(_value);
182 _value = nullptr;
183 }
184 }
185
186 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
187 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
188 size_t len = strlen(module_name) + 1;
189 _module_name = AllocateHeap(len, mtInternal);
190 strncpy(_module_name, module_name, len); // copy the trailing null
191 _path = new PathString(path);
192 }
193
194 ModulePatchPath::~ModulePatchPath() {
195 if (_module_name != nullptr) {
196 FreeHeap(_module_name);
197 _module_name = nullptr;
198 }
199 if (_path != nullptr) {
200 delete _path;
201 _path = nullptr;
202 }
203 }
204
205 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
206 if (key == nullptr) {
207 _key = nullptr;
208 } else {
209 _key = AllocateHeap(strlen(key)+1, mtArguments);
210 strcpy(_key, key);
211 }
212 _next = nullptr;
213 _internal = internal;
214 _writeable = writeable;
215 }
216
217 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
218 // part of the option string.
219 static bool match_option(const JavaVMOption *option, const char* name,
220 const char** tail) {
221 size_t len = strlen(name);
222 if (strncmp(option->optionString, name, len) == 0) {
223 *tail = option->optionString + len;
224 return true;
225 } else {
226 return false;
227 }
228 }
229
230 // Check if 'option' matches 'name'. No "tail" is allowed.
231 static bool match_option(const JavaVMOption *option, const char* name) {
232 const char* tail = nullptr;
233 bool result = match_option(option, name, &tail);
234 if (tail != nullptr && *tail == '\0') {
235 return result;
236 } else {
237 return false;
238 }
239 }
240
241 // Return true if any of the strings in null-terminated array 'names' matches.
242 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
243 // the option must match exactly.
244 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
245 bool tail_allowed) {
246 for (/* empty */; *names != nullptr; ++names) {
247 if (match_option(option, *names, tail)) {
248 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
249 return true;
250 }
251 }
252 }
253 return false;
254 }
255
256 #if INCLUDE_JFR
257 static bool _has_jfr_option = false; // is using JFR
258
259 // return true on failure
260 static bool match_jfr_option(const JavaVMOption** option) {
261 assert((*option)->optionString != nullptr, "invariant");
262 char* tail = nullptr;
263 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
264 _has_jfr_option = true;
265 return Jfr::on_start_flight_recording_option(option, tail);
266 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
267 _has_jfr_option = true;
268 return Jfr::on_flight_recorder_option(option, tail);
269 }
270 return false;
271 }
272
273 bool Arguments::has_jfr_option() {
274 return _has_jfr_option;
275 }
276 #endif
277
278 static void logOption(const char* opt) {
279 if (PrintVMOptions) {
280 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
281 }
282 }
283
284 bool needs_module_property_warning = false;
285
286 #define MODULE_PROPERTY_PREFIX "jdk.module."
287 #define MODULE_PROPERTY_PREFIX_LEN 11
288 #define ADDEXPORTS "addexports"
289 #define ADDEXPORTS_LEN 10
290 #define ADDREADS "addreads"
291 #define ADDREADS_LEN 8
292 #define ADDOPENS "addopens"
293 #define ADDOPENS_LEN 8
294 #define PATCH "patch"
295 #define PATCH_LEN 5
296 #define ADDMODS "addmods"
297 #define ADDMODS_LEN 7
298 #define LIMITMODS "limitmods"
299 #define LIMITMODS_LEN 9
300 #define PATH "path"
301 #define PATH_LEN 4
302 #define UPGRADE_PATH "upgrade.path"
303 #define UPGRADE_PATH_LEN 12
304 #define ENABLE_NATIVE_ACCESS "enable.native.access"
305 #define ENABLE_NATIVE_ACCESS_LEN 20
306
307 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
308 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
309 return ((strncmp(option, property, len) == 0) &&
310 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
311 }
312
313 // Return true if property starts with "jdk.module." and its ensuing chars match
314 // any of the reserved module properties.
315 // property should be passed without the leading "-D".
316 bool Arguments::is_internal_module_property(const char* property) {
317 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
318 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
319 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
320 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
321 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
322 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
323 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
324 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
325 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
326 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
327 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
328 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
329 return true;
330 }
331 }
332 return false;
333 }
334
335 // Process java launcher properties.
336 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
337 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
338 // Must do this before setting up other system properties,
339 // as some of them may depend on launcher type.
340 for (int index = 0; index < args->nOptions; index++) {
341 const JavaVMOption* option = args->options + index;
342 const char* tail;
343
344 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
345 process_java_launcher_argument(tail, option->extraInfo);
346 continue;
347 }
348 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
349 if (strcmp(tail, "true") == 0) {
350 _sun_java_launcher_is_altjvm = true;
351 }
352 continue;
353 }
354 }
355 }
356
357 // Initialize system properties key and value.
358 void Arguments::init_system_properties() {
359
360 // Set up _boot_class_path which is not a property but
361 // relies heavily on argument processing and the jdk.boot.class.path.append
362 // property. It is used to store the underlying boot class path.
363 _boot_class_path = new PathString(nullptr);
364
365 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
366 "Java Virtual Machine Specification", false));
367 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
369 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
370
371 // Initialize the vm.info now, but it will need updating after argument parsing.
372 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
373
374 // Following are JVMTI agent writable properties.
375 // Properties values are set to nullptr and they are
376 // os specific they are initialized in os::init_system_properties_values().
377 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
378 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
379 _java_home = new SystemProperty("java.home", nullptr, true);
380 _java_class_path = new SystemProperty("java.class.path", "", true);
381 // jdk.boot.class.path.append is a non-writeable, internal property.
382 // It can only be set by either:
383 // - -Xbootclasspath/a:
384 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
385 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
386
387 // Add to System Property list.
388 PropertyList_add(&_system_properties, _sun_boot_library_path);
389 PropertyList_add(&_system_properties, _java_library_path);
390 PropertyList_add(&_system_properties, _java_home);
391 PropertyList_add(&_system_properties, _java_class_path);
392 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
393 PropertyList_add(&_system_properties, _vm_info);
394
395 // Set OS specific system properties values
396 os::init_system_properties_values();
397 }
398
399 // Update/Initialize System properties after JDK version number is known
400 void Arguments::init_version_specific_system_properties() {
401 enum { bufsz = 16 };
402 char buffer[bufsz];
403 const char* spec_vendor = "Oracle Corporation";
404 uint32_t spec_version = JDK_Version::current().major_version();
405
406 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
407
408 PropertyList_add(&_system_properties,
409 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
410 PropertyList_add(&_system_properties,
411 new SystemProperty("java.vm.specification.version", buffer, false));
412 PropertyList_add(&_system_properties,
413 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
414 }
415
416 /*
417 * -XX argument processing:
418 *
419 * -XX arguments are defined in several places, such as:
420 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
421 * -XX arguments are parsed in parse_argument().
422 * -XX argument bounds checking is done in check_vm_args_consistency().
423 *
424 * Over time -XX arguments may change. There are mechanisms to handle common cases:
425 *
426 * ALIASED: An option that is simply another name for another option. This is often
427 * part of the process of deprecating a flag, but not all aliases need
428 * to be deprecated.
429 *
430 * Create an alias for an option by adding the old and new option names to the
431 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
432 *
433 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
434 * support may be removed in the future. Both regular and aliased options may be
435 * deprecated.
436 *
437 * Add a deprecation warning for an option (or alias) by adding an entry in the
438 * "special_jvm_flags" table and setting the "deprecated_in" field.
439 * Often an option "deprecated" in one major release will
440 * be made "obsolete" in the next. In this case the entry should also have its
441 * "obsolete_in" field set.
442 *
443 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
444 * on the command line. A warning is printed to let the user know that option might not
445 * be accepted in the future.
446 *
447 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
448 * table and setting the "obsolete_in" field.
449 *
450 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
451 * to the current JDK version. The system will flatly refuse to admit the existence of
452 * the flag. This allows a flag to die automatically over JDK releases.
453 *
454 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
455 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
456 * - Newly obsolete or expired deprecated options should have their global variable
457 * definitions removed (from globals.hpp, etc) and related implementations removed.
458 *
459 * Recommended approach for removing options:
460 *
461 * To remove options commonly used by customers (e.g. product -XX options), use
462 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
463 *
464 * To remove internal options (e.g. diagnostic, experimental, develop options), use
465 * a 2-step model adding major release numbers to the obsolete and expire columns.
466 *
467 * To change the name of an option, use the alias table as well as a 2-step
468 * model adding major release numbers to the deprecate and expire columns.
469 * Think twice about aliasing commonly used customer options.
470 *
471 * There are times when it is appropriate to leave a future release number as undefined.
472 *
473 * Tests: Aliases should be tested in VMAliasOptions.java.
474 * Deprecated options should be tested in VMDeprecatedOptions.java.
475 */
476
477 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
478 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
479 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
480 // the command-line as usual, but will issue a warning.
481 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
482 // the command-line, while issuing a warning and ignoring the flag value.
483 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
484 // existence of the flag.
485 //
486 // MANUAL CLEANUP ON JDK VERSION UPDATES:
487 // This table ensures that the handling of options will update automatically when the JDK
488 // version is incremented, but the source code needs to be cleanup up manually:
489 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
490 // variable should be removed, as well as users of the variable.
491 // - As "deprecated" options age into "obsolete" options, move the entry into the
492 // "Obsolete Flags" section of the table.
493 // - All expired options should be removed from the table.
494 static SpecialFlag const special_jvm_flags[] = {
495 // -------------- Deprecated Flags --------------
496 // --- Non-alias flags - sorted by obsolete_in then expired_in:
497 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
498 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
501 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
502 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
503 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
504 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
505 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
506 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
507
508 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
509 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
510 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
511 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
512
513 // -------------- Obsolete Flags - sorted by expired_in --------------
514
515 { "EnableWaitForParallelLoad", JDK_Version::jdk(20), JDK_Version::jdk(21), JDK_Version::jdk(22) },
516 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
517 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
518 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
519 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
520 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
521 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
522
523 { "G1UsePreventiveGC", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(22) },
524 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
525 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
526 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
527 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
528
529 #ifdef ASSERT
530 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
531 #endif
532
533 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
534 // These entries will generate build errors. Their purpose is to test the macros.
535 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
536 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
537 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
538 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
539 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
540 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
541 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
542 #endif
543
544 { nullptr, JDK_Version(0), JDK_Version(0) }
545 };
546
547 // Flags that are aliases for other flags.
548 typedef struct {
549 const char* alias_name;
550 const char* real_name;
551 } AliasedFlag;
552
553 static AliasedFlag const aliased_jvm_flags[] = {
554 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
555 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
556 { nullptr, nullptr}
557 };
558
559 // Return true if "v" is less than "other", where "other" may be "undefined".
560 static bool version_less_than(JDK_Version v, JDK_Version other) {
561 assert(!v.is_undefined(), "must be defined");
562 if (!other.is_undefined() && v.compare(other) >= 0) {
563 return false;
564 } else {
565 return true;
566 }
567 }
568
569 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
570 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
571 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
572 flag = special_jvm_flags[i];
573 return true;
574 }
575 }
576 return false;
577 }
578
579 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
580 assert(version != nullptr, "Must provide a version buffer");
581 SpecialFlag flag;
582 if (lookup_special_flag(flag_name, flag)) {
583 if (!flag.obsolete_in.is_undefined()) {
584 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
585 *version = flag.obsolete_in;
586 // This flag may have been marked for obsoletion in this version, but we may not
587 // have actually removed it yet. Rather than ignoring it as soon as we reach
588 // this version we allow some time for the removal to happen. So if the flag
589 // still actually exists we process it as normal, but issue an adjusted warning.
590 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
591 if (real_flag != nullptr) {
592 char version_str[256];
593 version->to_string(version_str, sizeof(version_str));
594 warning("Temporarily processing option %s; support is scheduled for removal in %s",
595 flag_name, version_str);
596 return false;
597 }
598 return true;
599 }
600 }
601 }
602 return false;
603 }
604
605 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
606 assert(version != nullptr, "Must provide a version buffer");
607 SpecialFlag flag;
608 if (lookup_special_flag(flag_name, flag)) {
609 if (!flag.deprecated_in.is_undefined()) {
610 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
611 version_less_than(JDK_Version::current(), flag.expired_in)) {
612 *version = flag.deprecated_in;
613 return 1;
614 } else {
615 return -1;
616 }
617 }
618 }
619 return 0;
620 }
621
622 const char* Arguments::real_flag_name(const char *flag_name) {
623 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
624 const AliasedFlag& flag_status = aliased_jvm_flags[i];
625 if (strcmp(flag_status.alias_name, flag_name) == 0) {
626 return flag_status.real_name;
627 }
628 }
629 return flag_name;
630 }
631
632 #ifdef ASSERT
633 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
634 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
635 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
636 return true;
637 }
638 }
639 return false;
640 }
641
642 // Verifies the correctness of the entries in the special_jvm_flags table.
643 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
644 // version being earlier than the deprecation version, then a warning is issued
645 // and verification fails - by returning false. If it is detected that the table
646 // is out of date, with respect to the current version, then ideally a warning is
647 // issued but verification does not fail. This allows the VM to operate when the
648 // version is first updated, without needing to update all the impacted flags at
649 // the same time. In practice we can't issue the warning immediately when the version
650 // is updated as it occurs for every test and some tests are not prepared to handle
651 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
652 // if the check_globals flag is true, and in addition allow a grace period and only
653 // check for stale flags when we hit build 25 (which is far enough into the 6 month
654 // release cycle that all flag updates should have been processed, whilst still
655 // leaving time to make the change before RDP2).
656 // We use a gtest to call this, passing true, so that we can detect stale flags before
657 // the end of the release cycle.
658
659 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
660
661 bool Arguments::verify_special_jvm_flags(bool check_globals) {
662 bool success = true;
663 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
664 const SpecialFlag& flag = special_jvm_flags[i];
665 if (lookup_special_flag(flag.name, i)) {
666 warning("Duplicate special flag declaration \"%s\"", flag.name);
667 success = false;
668 }
669 if (flag.deprecated_in.is_undefined() &&
670 flag.obsolete_in.is_undefined()) {
671 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
672 success = false;
673 }
674
675 if (!flag.deprecated_in.is_undefined()) {
676 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
677 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
678 success = false;
679 }
680
681 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
682 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
683 success = false;
684 }
685 }
686
687 if (!flag.obsolete_in.is_undefined()) {
688 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
689 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
690 success = false;
691 }
692
693 // if flag has become obsolete it should not have a "globals" flag defined anymore.
694 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
695 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
696 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
697 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
698 success = false;
699 }
700 }
701
702 } else if (!flag.expired_in.is_undefined()) {
703 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
704 success = false;
705 }
706
707 if (!flag.expired_in.is_undefined()) {
708 // if flag has become expired it should not have a "globals" flag defined anymore.
709 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
710 !version_less_than(JDK_Version::current(), flag.expired_in)) {
711 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
712 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
713 success = false;
714 }
715 }
716 }
717 }
718 return success;
719 }
720 #endif
721
722 bool Arguments::atojulong(const char *s, julong* result) {
723 return parse_integer(s, result);
724 }
725
726 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
727 if (size < min_size) return arg_too_small;
728 if (size > max_size) return arg_too_big;
729 return arg_in_range;
730 }
731
732 // Describe an argument out of range error
733 void Arguments::describe_range_error(ArgsRange errcode) {
734 switch(errcode) {
735 case arg_too_big:
736 jio_fprintf(defaultStream::error_stream(),
737 "The specified size exceeds the maximum "
738 "representable size.\n");
739 break;
740 case arg_too_small:
741 case arg_unreadable:
742 case arg_in_range:
743 // do nothing for now
744 break;
745 default:
746 ShouldNotReachHere();
747 }
748 }
749
750 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
751 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
752 return true;
753 } else {
754 return false;
755 }
756 }
757
758 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
759 // strtod allows leading whitespace, but our flag format does not.
760 if (*value == '\0' || isspace(*value)) {
761 return false;
762 }
763 char* end;
764 errno = 0;
765 double v = strtod(value, &end);
766 if ((errno != 0) || (*end != 0)) {
767 return false;
768 }
769 if (g_isnan(v) || !g_isfinite(v)) {
770 // Currently we cannot handle these special values.
771 return false;
772 }
773
774 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
775 return true;
776 }
777 return false;
778 }
779
780 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
781 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
782
783 if (flag->is_int()) {
784 int v;
785 if (parse_integer(value, &v)) {
786 result = JVMFlagAccess::set_int(flag, &v, origin);
787 }
788 } else if (flag->is_uint()) {
789 uint v;
790 if (parse_integer(value, &v)) {
791 result = JVMFlagAccess::set_uint(flag, &v, origin);
792 }
793 } else if (flag->is_intx()) {
794 intx v;
795 if (parse_integer(value, &v)) {
796 result = JVMFlagAccess::set_intx(flag, &v, origin);
797 }
798 } else if (flag->is_uintx()) {
799 uintx v;
800 if (parse_integer(value, &v)) {
801 result = JVMFlagAccess::set_uintx(flag, &v, origin);
802 }
803 } else if (flag->is_uint64_t()) {
804 uint64_t v;
805 if (parse_integer(value, &v)) {
806 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
807 }
808 } else if (flag->is_size_t()) {
809 size_t v;
810 if (parse_integer(value, &v)) {
811 result = JVMFlagAccess::set_size_t(flag, &v, origin);
812 }
813 }
814
815 return result == JVMFlag::SUCCESS;
816 }
817
818 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
819 if (value[0] == '\0') {
820 value = nullptr;
821 }
822 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
823 // Contract: JVMFlag always returns a pointer that needs freeing.
824 FREE_C_HEAP_ARRAY(char, value);
825 return true;
826 }
827
828 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
829 const char* old_value = "";
830 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
831 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
832 size_t new_len = strlen(new_value);
833 const char* value;
834 char* free_this_too = nullptr;
835 if (old_len == 0) {
836 value = new_value;
837 } else if (new_len == 0) {
838 value = old_value;
839 } else {
840 size_t length = old_len + 1 + new_len + 1;
841 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
842 // each new setting adds another LINE to the switch:
843 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
844 value = buf;
845 free_this_too = buf;
846 }
847 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
848 // JVMFlag always returns a pointer that needs freeing.
849 FREE_C_HEAP_ARRAY(char, value);
850 // JVMFlag made its own copy, so I must delete my own temp. buffer.
851 FREE_C_HEAP_ARRAY(char, free_this_too);
852 return true;
853 }
854
855 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
856 const char* real_name = real_flag_name(arg);
857 JDK_Version since = JDK_Version();
858 switch (is_deprecated_flag(arg, &since)) {
859 case -1: {
860 // Obsolete or expired, so don't process normally,
861 // but allow for an obsolete flag we're still
862 // temporarily allowing.
863 if (!is_obsolete_flag(arg, &since)) {
864 return real_name;
865 }
866 // Note if we're not considered obsolete then we can't be expired either
867 // as obsoletion must come first.
868 return nullptr;
869 }
870 case 0:
871 return real_name;
872 case 1: {
873 char version[256];
874 since.to_string(version, sizeof(version));
875 if (real_name != arg) {
876 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
877 arg, version, real_name);
878 } else {
879 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
880 arg, version);
881 }
882 return real_name;
883 }
884 }
885 ShouldNotReachHere();
886 return nullptr;
887 }
888
889 #define BUFLEN 255
890
891 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
892 char name_copied[BUFLEN+1];
893 if (name[name_length] != 0) {
894 if (name_length > BUFLEN) {
895 return nullptr;
896 } else {
897 strncpy(name_copied, name, name_length);
898 name_copied[name_length] = '\0';
899 name = name_copied;
900 }
901 }
902
903 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
904 if (real_name == nullptr) {
905 return nullptr;
906 }
907 JVMFlag* flag = JVMFlag::find_flag(real_name);
908 return flag;
909 }
910
911 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
912 bool is_bool = false;
913 bool bool_val = false;
914 char c = *arg;
915 if (c == '+' || c == '-') {
916 is_bool = true;
917 bool_val = (c == '+');
918 arg++;
919 }
920
921 const char* name = arg;
922 while (true) {
923 c = *arg;
924 if (isalnum(c) || (c == '_')) {
925 ++arg;
926 } else {
927 break;
928 }
929 }
930
931 size_t name_len = size_t(arg - name);
932 if (name_len == 0) {
933 return false;
934 }
935
936 JVMFlag* flag = find_jvm_flag(name, name_len);
937 if (flag == nullptr) {
938 return false;
939 }
940
941 if (is_bool) {
942 if (*arg != 0) {
943 // Error -- extra characters such as -XX:+BoolFlag=123
944 return false;
945 }
946 return set_bool_flag(flag, bool_val, origin);
947 }
948
949 if (arg[0] == '=') {
950 const char* value = arg + 1;
951 if (flag->is_ccstr()) {
952 if (flag->ccstr_accumulates()) {
953 return append_to_string_flag(flag, value, origin);
954 } else {
955 return set_string_flag(flag, value, origin);
956 }
957 } else if (flag->is_double()) {
958 return set_fp_numeric_flag(flag, value, origin);
959 } else {
960 return set_numeric_flag(flag, value, origin);
961 }
962 }
963
964 if (arg[0] == ':' && arg[1] == '=') {
965 // -XX:Foo:=xxx will reset the string flag to the given value.
966 const char* value = arg + 2;
967 return set_string_flag(flag, value, origin);
968 }
969
970 return false;
971 }
972
973 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
974 assert(bldarray != nullptr, "illegal argument");
975
976 if (arg == nullptr) {
977 return;
978 }
979
980 int new_count = *count + 1;
981
982 // expand the array and add arg to the last element
983 if (*bldarray == nullptr) {
984 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
985 } else {
986 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
987 }
988 (*bldarray)[*count] = os::strdup_check_oom(arg);
989 *count = new_count;
990 }
991
992 void Arguments::build_jvm_args(const char* arg) {
993 add_string(&_jvm_args_array, &_num_jvm_args, arg);
994 }
995
996 void Arguments::build_jvm_flags(const char* arg) {
997 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
998 }
999
1000 // utility function to return a string that concatenates all
1001 // strings in a given char** array
1002 const char* Arguments::build_resource_string(char** args, int count) {
1003 if (args == nullptr || count == 0) {
1004 return nullptr;
1005 }
1006 size_t length = 0;
1007 for (int i = 0; i < count; i++) {
1008 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1009 }
1010 char* s = NEW_RESOURCE_ARRAY(char, length);
1011 char* dst = s;
1012 for (int j = 0; j < count; j++) {
1013 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1014 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1015 dst += offset;
1016 length -= offset;
1017 }
1018 return (const char*) s;
1019 }
1020
1021 void Arguments::print_on(outputStream* st) {
1022 st->print_cr("VM Arguments:");
1023 if (num_jvm_flags() > 0) {
1024 st->print("jvm_flags: "); print_jvm_flags_on(st);
1025 st->cr();
1026 }
1027 if (num_jvm_args() > 0) {
1028 st->print("jvm_args: "); print_jvm_args_on(st);
1029 st->cr();
1030 }
1031 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1032 if (_java_class_path != nullptr) {
1033 char* path = _java_class_path->value();
1034 size_t len = strlen(path);
1035 st->print("java_class_path (initial): ");
1036 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1037 if (len == 0) {
1038 st->print_raw_cr("<not set>");
1039 } else {
1040 st->print_raw_cr(path, len);
1041 }
1042 }
1043 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1044 }
1045
1046 void Arguments::print_summary_on(outputStream* st) {
1047 // Print the command line. Environment variables that are helpful for
1048 // reproducing the problem are written later in the hs_err file.
1049 // flags are from setting file
1050 if (num_jvm_flags() > 0) {
1051 st->print_raw("Settings File: ");
1052 print_jvm_flags_on(st);
1053 st->cr();
1054 }
1055 // args are the command line and environment variable arguments.
1056 st->print_raw("Command Line: ");
1057 if (num_jvm_args() > 0) {
1058 print_jvm_args_on(st);
1059 }
1060 // this is the classfile and any arguments to the java program
1061 if (java_command() != nullptr) {
1062 st->print("%s", java_command());
1063 }
1064 st->cr();
1065 }
1066
1067 void Arguments::print_jvm_flags_on(outputStream* st) {
1068 if (_num_jvm_flags > 0) {
1069 for (int i=0; i < _num_jvm_flags; i++) {
1070 st->print("%s ", _jvm_flags_array[i]);
1071 }
1072 }
1073 }
1074
1075 void Arguments::print_jvm_args_on(outputStream* st) {
1076 if (_num_jvm_args > 0) {
1077 for (int i=0; i < _num_jvm_args; i++) {
1078 st->print("%s ", _jvm_args_array[i]);
1079 }
1080 }
1081 }
1082
1083 bool Arguments::process_argument(const char* arg,
1084 jboolean ignore_unrecognized,
1085 JVMFlagOrigin origin) {
1086 JDK_Version since = JDK_Version();
1087
1088 if (parse_argument(arg, origin)) {
1089 return true;
1090 }
1091
1092 // Determine if the flag has '+', '-', or '=' characters.
1093 bool has_plus_minus = (*arg == '+' || *arg == '-');
1094 const char* const argname = has_plus_minus ? arg + 1 : arg;
1095
1096 size_t arg_len;
1097 const char* equal_sign = strchr(argname, '=');
1098 if (equal_sign == nullptr) {
1099 arg_len = strlen(argname);
1100 } else {
1101 arg_len = equal_sign - argname;
1102 }
1103
1104 // Only make the obsolete check for valid arguments.
1105 if (arg_len <= BUFLEN) {
1106 // Construct a string which consists only of the argument name without '+', '-', or '='.
1107 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1108 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1109 if (is_obsolete_flag(stripped_argname, &since)) {
1110 char version[256];
1111 since.to_string(version, sizeof(version));
1112 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1113 return true;
1114 }
1115 }
1116
1117 // For locked flags, report a custom error message if available.
1118 // Otherwise, report the standard unrecognized VM option.
1119 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1120 if (found_flag != nullptr) {
1121 char locked_message_buf[BUFLEN];
1122 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1123 if (strlen(locked_message_buf) == 0) {
1124 if (found_flag->is_bool() && !has_plus_minus) {
1125 jio_fprintf(defaultStream::error_stream(),
1126 "Missing +/- setting for VM option '%s'\n", argname);
1127 } else if (!found_flag->is_bool() && has_plus_minus) {
1128 jio_fprintf(defaultStream::error_stream(),
1129 "Unexpected +/- setting in VM option '%s'\n", argname);
1130 } else {
1131 jio_fprintf(defaultStream::error_stream(),
1132 "Improperly specified VM option '%s'\n", argname);
1133 }
1134 } else {
1135 #ifdef PRODUCT
1136 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1137 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1138 if (ignore_unrecognized && mismatched) {
1139 return true;
1140 }
1141 #endif
1142 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1143 }
1144 } else {
1145 if (ignore_unrecognized) {
1146 return true;
1147 }
1148 jio_fprintf(defaultStream::error_stream(),
1149 "Unrecognized VM option '%s'\n", argname);
1150 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1151 if (fuzzy_matched != nullptr) {
1152 jio_fprintf(defaultStream::error_stream(),
1153 "Did you mean '%s%s%s'? ",
1154 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1155 fuzzy_matched->name(),
1156 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1157 }
1158 }
1159
1160 // allow for commandline "commenting out" options like -XX:#+Verbose
1161 return arg[0] == '#';
1162 }
1163
1164 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1165 FILE* stream = os::fopen(file_name, "rb");
1166 if (stream == nullptr) {
1167 if (should_exist) {
1168 jio_fprintf(defaultStream::error_stream(),
1169 "Could not open settings file %s\n", file_name);
1170 return false;
1171 } else {
1172 return true;
1173 }
1174 }
1175
1176 char token[1024];
1177 int pos = 0;
1178
1179 bool in_white_space = true;
1180 bool in_comment = false;
1181 bool in_quote = false;
1182 char quote_c = 0;
1183 bool result = true;
1184
1185 int c = getc(stream);
1186 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1187 if (in_white_space) {
1188 if (in_comment) {
1189 if (c == '\n') in_comment = false;
1190 } else {
1191 if (c == '#') in_comment = true;
1192 else if (!isspace(c)) {
1193 in_white_space = false;
1194 token[pos++] = c;
1195 }
1196 }
1197 } else {
1198 if (c == '\n' || (!in_quote && isspace(c))) {
1199 // token ends at newline, or at unquoted whitespace
1200 // this allows a way to include spaces in string-valued options
1201 token[pos] = '\0';
1202 logOption(token);
1203 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1204 build_jvm_flags(token);
1205 pos = 0;
1206 in_white_space = true;
1207 in_quote = false;
1208 } else if (!in_quote && (c == '\'' || c == '"')) {
1209 in_quote = true;
1210 quote_c = c;
1211 } else if (in_quote && (c == quote_c)) {
1212 in_quote = false;
1213 } else {
1214 token[pos++] = c;
1215 }
1216 }
1217 c = getc(stream);
1218 }
1219 if (pos > 0) {
1220 token[pos] = '\0';
1221 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1222 build_jvm_flags(token);
1223 }
1224 fclose(stream);
1225 return result;
1226 }
1227
1228 //=============================================================================================================
1229 // Parsing of properties (-D)
1230
1231 const char* Arguments::get_property(const char* key) {
1232 return PropertyList_get_value(system_properties(), key);
1233 }
1234
1235 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1236 const char* eq = strchr(prop, '=');
1237 const char* key;
1238 const char* value = "";
1239
1240 if (eq == nullptr) {
1241 // property doesn't have a value, thus use passed string
1242 key = prop;
1243 } else {
1244 // property have a value, thus extract it and save to the
1245 // allocated string
1246 size_t key_len = eq - prop;
1247 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1248
1249 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1250 key = tmp_key;
1251
1252 value = &prop[key_len + 1];
1253 }
1254
1255 #if INCLUDE_CDS
1256 if (is_internal_module_property(key) ||
1257 strcmp(key, "jdk.module.main") == 0) {
1258 MetaspaceShared::disable_optimized_module_handling();
1259 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
1260 }
1261 if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
1262 strcmp(key, "jdk.module.validation") == 0 ||
1263 strcmp(key, "java.system.class.loader") == 0) {
1264 MetaspaceShared::disable_full_module_graph();
1265 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
1266 }
1267 #endif
1268
1269 if (strcmp(key, "java.compiler") == 0) {
1270 // we no longer support java.compiler system property, log a warning and let it get
1271 // passed to Java, like any other system property
1272 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1273 // for applications using NONE or empty value, log a more informative message
1274 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1275 } else {
1276 warning("The java.compiler system property is obsolete and no longer supported.");
1277 }
1278 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1279 // sun.java.launcher.is_altjvm property is
1280 // private and is processed in process_sun_java_launcher_properties();
1281 // the sun.java.launcher property is passed on to the java application
1282 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1283 // append is true, writable is true, internal is false
1284 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1285 WriteableProperty, ExternalProperty);
1286 } else {
1287 if (strcmp(key, "sun.java.command") == 0) {
1288 char *old_java_command = _java_command;
1289 _java_command = os::strdup_check_oom(value, mtArguments);
1290 if (old_java_command != nullptr) {
1291 os::free(old_java_command);
1292 }
1293 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1294 // If this property is set on the command line then its value will be
1295 // displayed in VM error logs as the URL at which to submit such logs.
1296 // Normally the URL displayed in error logs is different from the value
1297 // of this system property, so a different property should have been
1298 // used here, but we leave this as-is in case someone depends upon it.
1299 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1300 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1301 // its value without going through the property list or making a Java call.
1302 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1303 if (old_java_vendor_url_bug != nullptr) {
1304 os::free((void *)old_java_vendor_url_bug);
1305 }
1306 }
1307
1308 // Create new property and add at the end of the list
1309 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1310 }
1311
1312 if (key != prop) {
1313 // SystemProperty copy passed value, thus free previously allocated
1314 // memory
1315 FreeHeap((void *)key);
1316 }
1317
1318 return true;
1319 }
1320
1321 #if INCLUDE_CDS
1322 const char* unsupported_properties[] = { "jdk.module.limitmods",
1323 "jdk.module.upgrade.path",
1324 "jdk.module.patch.0" };
1325 const char* unsupported_options[] = { "--limit-modules",
1326 "--upgrade-module-path",
1327 "--patch-module"
1328 };
1329 void Arguments::check_unsupported_dumping_properties() {
1330 assert(is_dumping_archive(),
1331 "this function is only used with CDS dump time");
1332 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1333 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1334 SystemProperty* sp = system_properties();
1335 while (sp != nullptr) {
1336 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1337 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1338 vm_exit_during_initialization(
1339 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1340 }
1341 }
1342 sp = sp->next();
1343 }
1344
1345 // Check for an exploded module build in use with -Xshare:dump.
1346 if (!has_jimage()) {
1347 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1348 }
1349 }
1350
1351 bool Arguments::check_unsupported_cds_runtime_properties() {
1352 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1353 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1354 if (ArchiveClassesAtExit != nullptr) {
1355 // dynamic dumping, just return false for now.
1356 // check_unsupported_dumping_properties() will be called later to check the same set of
1357 // properties, and will exit the VM with the correct error message if the unsupported properties
1358 // are used.
1359 return false;
1360 }
1361 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1362 if (get_property(unsupported_properties[i]) != nullptr) {
1363 if (RequireSharedSpaces) {
1364 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1365 } else {
1366 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1367 }
1368 return true;
1369 }
1370 }
1371 return false;
1372 }
1373 #endif
1374
1375 //===========================================================================================================
1376 // Setting int/mixed/comp mode flags
1377
1378 void Arguments::set_mode_flags(Mode mode) {
1379 // Set up default values for all flags.
1380 // If you add a flag to any of the branches below,
1381 // add a default value for it here.
1382 _mode = mode;
1383
1384 // Ensure Agent_OnLoad has the correct initial values.
1385 // This may not be the final mode; mode may change later in onload phase.
1386 PropertyList_unique_add(&_system_properties, "java.vm.info",
1387 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1388
1389 UseInterpreter = true;
1390 UseCompiler = true;
1391 UseLoopCounter = true;
1392
1393 // Default values may be platform/compiler dependent -
1394 // use the saved values
1395 ClipInlining = Arguments::_ClipInlining;
1396 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1397 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1398 BackgroundCompilation = Arguments::_BackgroundCompilation;
1399
1400 // Change from defaults based on mode
1401 switch (mode) {
1402 default:
1403 ShouldNotReachHere();
1404 break;
1405 case _int:
1406 UseCompiler = false;
1407 UseLoopCounter = false;
1408 AlwaysCompileLoopMethods = false;
1409 UseOnStackReplacement = false;
1410 break;
1411 case _mixed:
1412 // same as default
1413 break;
1414 case _comp:
1415 UseInterpreter = false;
1416 BackgroundCompilation = false;
1417 ClipInlining = false;
1418 break;
1419 }
1420 }
1421
1422 // Conflict: required to use shared spaces (-Xshare:on), but
1423 // incompatible command line options were chosen.
1424 static void no_shared_spaces(const char* message) {
1425 if (RequireSharedSpaces) {
1426 jio_fprintf(defaultStream::error_stream(),
1427 "Class data sharing is inconsistent with other specified options.\n");
1428 vm_exit_during_initialization("Unable to use shared archive", message);
1429 } else {
1430 log_info(cds)("Unable to use shared archive: %s", message);
1431 UseSharedSpaces = false;
1432 }
1433 }
1434
1435 void set_object_alignment() {
1436 // Object alignment.
1437 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1438 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1439 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1440 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1441 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1442 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1443
1444 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1445 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1446
1447 // Oop encoding heap max
1448 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1449 }
1450
1451 size_t Arguments::max_heap_for_compressed_oops() {
1452 // Avoid sign flip.
1453 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1454 // We need to fit both the null page and the heap into the memory budget, while
1455 // keeping alignment constraints of the heap. To guarantee the latter, as the
1456 // null page is located before the heap, we pad the null page to the conservative
1457 // maximum alignment that the GC may ever impose upon the heap.
1458 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1459 _conservative_max_heap_alignment);
1460
1461 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1462 NOT_LP64(ShouldNotReachHere(); return 0);
1463 }
1464
1465 void Arguments::set_use_compressed_oops() {
1466 #ifdef _LP64
1467 // MaxHeapSize is not set up properly at this point, but
1468 // the only value that can override MaxHeapSize if we are
1469 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1470 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1471
1472 if (max_heap_size <= max_heap_for_compressed_oops()) {
1473 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1474 FLAG_SET_ERGO(UseCompressedOops, true);
1475 }
1476 } else {
1477 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1478 warning("Max heap size too large for Compressed Oops");
1479 FLAG_SET_DEFAULT(UseCompressedOops, false);
1480 }
1481 }
1482 #endif // _LP64
1483 }
1484
1485 void Arguments::set_use_compressed_klass_ptrs() {
1486 #ifdef _LP64
1487 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1488 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1489 #endif // _LP64
1490 }
1491
1492 void Arguments::set_conservative_max_heap_alignment() {
1493 // The conservative maximum required alignment for the heap is the maximum of
1494 // the alignments imposed by several sources: any requirements from the heap
1495 // itself and the maximum page size we may run the VM with.
1496 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1497 _conservative_max_heap_alignment = MAX4(heap_alignment,
1498 os::vm_allocation_granularity(),
1499 os::max_page_size(),
1500 GCArguments::compute_heap_alignment());
1501 }
1502
1503 jint Arguments::set_ergonomics_flags() {
1504 GCConfig::initialize();
1505
1506 set_conservative_max_heap_alignment();
1507
1508 #ifdef _LP64
1509 set_use_compressed_oops();
1510 set_use_compressed_klass_ptrs();
1511
1512 // Also checks that certain machines are slower with compressed oops
1513 // in vm_version initialization code.
1514 #endif // _LP64
1515
1516 return JNI_OK;
1517 }
1518
1519 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1520 size_t max_allocatable;
1521 size_t result = limit;
1522 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1523 // The AggressiveHeap check is a temporary workaround to avoid calling
1524 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1525 // selected. This works because AggressiveHeap implies UseParallelGC
1526 // where we know the ratio will be 1. Once the AggressiveHeap option is
1527 // removed, this can be cleaned up.
1528 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1529 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1530 result = MIN2(result, max_allocatable / fraction);
1531 }
1532 return result;
1533 }
1534
1535 // Use static initialization to get the default before parsing
1536 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1537
1538 void Arguments::set_heap_size() {
1539 julong phys_mem;
1540
1541 // If the user specified one of these options, they
1542 // want specific memory sizing so do not limit memory
1543 // based on compressed oops addressability.
1544 // Also, memory limits will be calculated based on
1545 // available os physical memory, not our MaxRAM limit,
1546 // unless MaxRAM is also specified.
1547 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1548 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1549 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1550 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1551 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1552 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1553 !FLAG_IS_DEFAULT(MaxRAM));
1554 if (override_coop_limit) {
1555 if (FLAG_IS_DEFAULT(MaxRAM)) {
1556 phys_mem = os::physical_memory();
1557 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1558 } else {
1559 phys_mem = (julong)MaxRAM;
1560 }
1561 } else {
1562 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1563 : (julong)MaxRAM;
1564 }
1565
1566
1567 // Convert deprecated flags
1568 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1569 !FLAG_IS_DEFAULT(MaxRAMFraction))
1570 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1571
1572 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1573 !FLAG_IS_DEFAULT(MinRAMFraction))
1574 MinRAMPercentage = 100.0 / MinRAMFraction;
1575
1576 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1577 !FLAG_IS_DEFAULT(InitialRAMFraction))
1578 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1579
1580 // If the maximum heap size has not been set with -Xmx,
1581 // then set it as fraction of the size of physical memory,
1582 // respecting the maximum and minimum sizes of the heap.
1583 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1584 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1585 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1586 if (reasonable_min < MaxHeapSize) {
1587 // Small physical memory, so use a minimum fraction of it for the heap
1588 reasonable_max = reasonable_min;
1589 } else {
1590 // Not-small physical memory, so require a heap at least
1591 // as large as MaxHeapSize
1592 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1593 }
1594
1595 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1596 // Limit the heap size to ErgoHeapSizeLimit
1597 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1598 }
1599
1600 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1601
1602 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1603 // An initial heap size was specified on the command line,
1604 // so be sure that the maximum size is consistent. Done
1605 // after call to limit_heap_by_allocatable_memory because that
1606 // method might reduce the allocation size.
1607 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1608 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1609 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1610 }
1611
1612 #ifdef _LP64
1613 if (UseCompressedOops || UseCompressedClassPointers) {
1614 // HeapBaseMinAddress can be greater than default but not less than.
1615 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1616 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1617 // matches compressed oops printing flags
1618 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1619 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1620 DefaultHeapBaseMinAddress,
1621 DefaultHeapBaseMinAddress/G,
1622 HeapBaseMinAddress);
1623 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1624 }
1625 }
1626 }
1627 if (UseCompressedOops) {
1628 // Limit the heap size to the maximum possible when using compressed oops
1629 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1630
1631 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1632 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1633 // but it should be not less than default MaxHeapSize.
1634 max_coop_heap -= HeapBaseMinAddress;
1635 }
1636
1637 // If user specified flags prioritizing os physical
1638 // memory limits, then disable compressed oops if
1639 // limits exceed max_coop_heap and UseCompressedOops
1640 // was not specified.
1641 if (reasonable_max > max_coop_heap) {
1642 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1643 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1644 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1645 "Please check the setting of MaxRAMPercentage %5.2f."
1646 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1647 FLAG_SET_ERGO(UseCompressedOops, false);
1648 } else {
1649 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1650 }
1651 }
1652 }
1653 #endif // _LP64
1654
1655 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1656 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1657 }
1658
1659 // If the minimum or initial heap_size have not been set or requested to be set
1660 // ergonomically, set them accordingly.
1661 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1662 julong reasonable_minimum = (julong)(OldSize + NewSize);
1663
1664 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1665
1666 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1667
1668 if (InitialHeapSize == 0) {
1669 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1670 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1671
1672 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1673 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1674
1675 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1676 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1677 }
1678 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1679 // synchronize with InitialHeapSize to avoid errors with the default value.
1680 if (MinHeapSize == 0) {
1681 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1682 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1683 }
1684 }
1685 }
1686
1687 // This option inspects the machine and attempts to set various
1688 // parameters to be optimal for long-running, memory allocation
1689 // intensive jobs. It is intended for machines with large
1690 // amounts of cpu and memory.
1691 jint Arguments::set_aggressive_heap_flags() {
1692 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1693 // VM, but we may not be able to represent the total physical memory
1694 // available (like having 8gb of memory on a box but using a 32bit VM).
1695 // Thus, we need to make sure we're using a julong for intermediate
1696 // calculations.
1697 julong initHeapSize;
1698 julong total_memory = os::physical_memory();
1699
1700 if (total_memory < (julong) 256 * M) {
1701 jio_fprintf(defaultStream::error_stream(),
1702 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1703 vm_exit(1);
1704 }
1705
1706 // The heap size is half of available memory, or (at most)
1707 // all of possible memory less 160mb (leaving room for the OS
1708 // when using ISM). This is the maximum; because adaptive sizing
1709 // is turned on below, the actual space used may be smaller.
1710
1711 initHeapSize = MIN2(total_memory / (julong) 2,
1712 total_memory - (julong) 160 * M);
1713
1714 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1715
1716 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1717 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1718 return JNI_EINVAL;
1719 }
1720 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1721 return JNI_EINVAL;
1722 }
1723 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1724 return JNI_EINVAL;
1725 }
1726 }
1727 if (FLAG_IS_DEFAULT(NewSize)) {
1728 // Make the young generation 3/8ths of the total heap.
1729 if (FLAG_SET_CMDLINE(NewSize,
1730 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1731 return JNI_EINVAL;
1732 }
1733 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1734 return JNI_EINVAL;
1735 }
1736 }
1737
1738 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1739 FLAG_SET_DEFAULT(UseLargePages, true);
1740 #endif
1741
1742 // Increase some data structure sizes for efficiency
1743 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1744 return JNI_EINVAL;
1745 }
1746 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1747 return JNI_EINVAL;
1748 }
1749 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1750 return JNI_EINVAL;
1751 }
1752
1753 // See the OldPLABSize comment below, but replace 'after promotion'
1754 // with 'after copying'. YoungPLABSize is the size of the survivor
1755 // space per-gc-thread buffers. The default is 4kw.
1756 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1757 return JNI_EINVAL;
1758 }
1759
1760 // OldPLABSize is the size of the buffers in the old gen that
1761 // UseParallelGC uses to promote live data that doesn't fit in the
1762 // survivor spaces. At any given time, there's one for each gc thread.
1763 // The default size is 1kw. These buffers are rarely used, since the
1764 // survivor spaces are usually big enough. For specjbb, however, there
1765 // are occasions when there's lots of live data in the young gen
1766 // and we end up promoting some of it. We don't have a definite
1767 // explanation for why bumping OldPLABSize helps, but the theory
1768 // is that a bigger PLAB results in retaining something like the
1769 // original allocation order after promotion, which improves mutator
1770 // locality. A minor effect may be that larger PLABs reduce the
1771 // number of PLAB allocation events during gc. The value of 8kw
1772 // was arrived at by experimenting with specjbb.
1773 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1774 return JNI_EINVAL;
1775 }
1776
1777 // Enable parallel GC and adaptive generation sizing
1778 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1779 return JNI_EINVAL;
1780 }
1781
1782 // Encourage steady state memory management
1783 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1784 return JNI_EINVAL;
1785 }
1786
1787 // This appears to improve mutator locality
1788 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1789 return JNI_EINVAL;
1790 }
1791
1792 return JNI_OK;
1793 }
1794
1795 // This must be called after ergonomics.
1796 void Arguments::set_bytecode_flags() {
1797 if (!RewriteBytecodes) {
1798 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1799 }
1800 }
1801
1802 // Aggressive optimization flags
1803 jint Arguments::set_aggressive_opts_flags() {
1804 #ifdef COMPILER2
1805 if (AggressiveUnboxing) {
1806 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1807 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1808 } else if (!EliminateAutoBox) {
1809 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1810 AggressiveUnboxing = false;
1811 }
1812 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1813 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1814 } else if (!DoEscapeAnalysis) {
1815 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1816 AggressiveUnboxing = false;
1817 }
1818 }
1819 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1820 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1821 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1822 }
1823 // Feed the cache size setting into the JDK
1824 char buffer[1024];
1825 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1826 if (!add_property(buffer)) {
1827 return JNI_ENOMEM;
1828 }
1829 }
1830 #endif
1831
1832 return JNI_OK;
1833 }
1834
1835 //===========================================================================================================
1836
1837 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1838 if (_sun_java_launcher != _default_java_launcher) {
1839 os::free(const_cast<char*>(_sun_java_launcher));
1840 }
1841 _sun_java_launcher = os::strdup_check_oom(launcher);
1842 }
1843
1844 bool Arguments::created_by_java_launcher() {
1845 assert(_sun_java_launcher != nullptr, "property must have value");
1846 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1847 }
1848
1849 bool Arguments::sun_java_launcher_is_altjvm() {
1850 return _sun_java_launcher_is_altjvm;
1851 }
1852
1853 //===========================================================================================================
1854 // Parsing of main arguments
1855
1856 unsigned int addreads_count = 0;
1857 unsigned int addexports_count = 0;
1858 unsigned int addopens_count = 0;
1859 unsigned int addmods_count = 0;
1860 unsigned int patch_mod_count = 0;
1861 unsigned int enable_native_access_count = 0;
1862
1863 // Check the consistency of vm_init_args
1864 bool Arguments::check_vm_args_consistency() {
1865 // Method for adding checks for flag consistency.
1866 // The intent is to warn the user of all possible conflicts,
1867 // before returning an error.
1868 // Note: Needs platform-dependent factoring.
1869 bool status = true;
1870
1871 if (TLABRefillWasteFraction == 0) {
1872 jio_fprintf(defaultStream::error_stream(),
1873 "TLABRefillWasteFraction should be a denominator, "
1874 "not " SIZE_FORMAT "\n",
1875 TLABRefillWasteFraction);
1876 status = false;
1877 }
1878
1879 status = CompilerConfig::check_args_consistency(status);
1880 #if INCLUDE_JVMCI
1881 if (status && EnableJVMCI) {
1882 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1883 AddProperty, UnwriteableProperty, InternalProperty);
1884 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1885 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1886 return false;
1887 }
1888 }
1889 }
1890 #endif
1891
1892 #if INCLUDE_JFR
1893 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1894 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1895 return false;
1896 }
1897 }
1898 #endif
1899
1900 #ifndef SUPPORT_RESERVED_STACK_AREA
1901 if (StackReservedPages != 0) {
1902 FLAG_SET_CMDLINE(StackReservedPages, 0);
1903 warning("Reserved Stack Area not supported on this platform");
1904 }
1905 #endif
1906
1907
1908 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64)
1909 if (LockingMode == LM_LIGHTWEIGHT) {
1910 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1911 warning("New lightweight locking not supported on this platform");
1912 }
1913 #endif
1914
1915 if (UseHeavyMonitors) {
1916 if (FLAG_IS_CMDLINE(LockingMode) && LockingMode != LM_MONITOR) {
1917 jio_fprintf(defaultStream::error_stream(),
1918 "Conflicting -XX:+UseHeavyMonitors and -XX:LockingMode=%d flags", LockingMode);
1919 return false;
1920 }
1921 FLAG_SET_CMDLINE(LockingMode, LM_MONITOR);
1922 }
1923
1924 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1925 if (LockingMode == LM_MONITOR) {
1926 jio_fprintf(defaultStream::error_stream(),
1927 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture");
1928 return false;
1929 }
1930 #endif
1931 #if (defined(X86) || defined(PPC64)) && !defined(ZERO)
1932 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
1933 jio_fprintf(defaultStream::error_stream(),
1934 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive");
1935
1936 return false;
1937 }
1938 #endif
1939 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1940 jio_fprintf(defaultStream::error_stream(),
1941 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)");
1942 return false;
1943 }
1944 return status;
1945 }
1946
1947 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1948 const char* option_type) {
1949 if (ignore) return false;
1950
1951 const char* spacer = " ";
1952 if (option_type == nullptr) {
1953 option_type = ++spacer; // Set both to the empty string.
1954 }
1955
1956 jio_fprintf(defaultStream::error_stream(),
1957 "Unrecognized %s%soption: %s\n", option_type, spacer,
1958 option->optionString);
1959 return true;
1960 }
1961
1962 static const char* user_assertion_options[] = {
1963 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1964 };
1965
1966 static const char* system_assertion_options[] = {
1967 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1968 };
1969
1970 bool Arguments::parse_uintx(const char* value,
1971 uintx* uintx_arg,
1972 uintx min_size) {
1973 uintx n;
1974 if (!parse_integer(value, &n)) {
1975 return false;
1976 }
1977 if (n >= min_size) {
1978 *uintx_arg = n;
1979 return true;
1980 } else {
1981 return false;
1982 }
1983 }
1984
1985 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1986 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1987 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1988 char* property = AllocateHeap(prop_len, mtArguments);
1989 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1990 if (ret < 0 || ret >= (int)prop_len) {
1991 FreeHeap(property);
1992 return false;
1993 }
1994 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1995 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1996 // that multiple occurrences of the associated flag just causes the existing property value to be
1997 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1998 // to a property after we have finished flag processing.
1999 bool added = add_property(property, WriteableProperty, internal);
2000 FreeHeap(property);
2001 return added;
2002 }
2003
2004 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2005 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2006 const unsigned int props_count_limit = 1000;
2007 const int max_digits = 3;
2008 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2009
2010 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2011 if (count < props_count_limit) {
2012 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2013 char* property = AllocateHeap(prop_len, mtArguments);
2014 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2015 if (ret < 0 || ret >= (int)prop_len) {
2016 FreeHeap(property);
2017 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2018 return false;
2019 }
2020 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2021 FreeHeap(property);
2022 return added;
2023 }
2024
2025 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2026 return false;
2027 }
2028
2029 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2030 julong* long_arg,
2031 julong min_size,
2032 julong max_size) {
2033 if (!parse_integer(s, long_arg)) return arg_unreadable;
2034 return check_memory_size(*long_arg, min_size, max_size);
2035 }
2036
2037 // Parse JavaVMInitArgs structure
2038
2039 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2040 const JavaVMInitArgs *java_tool_options_args,
2041 const JavaVMInitArgs *java_options_args,
2042 const JavaVMInitArgs *cmd_line_args) {
2043 bool patch_mod_javabase = false;
2044
2045 // Save default settings for some mode flags
2046 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2047 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2048 Arguments::_ClipInlining = ClipInlining;
2049 Arguments::_BackgroundCompilation = BackgroundCompilation;
2050
2051 // Remember the default value of SharedBaseAddress.
2052 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2053
2054 // Setup flags for mixed which is the default
2055 set_mode_flags(_mixed);
2056
2057 // Parse args structure generated from java.base vm options resource
2058 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
2059 if (result != JNI_OK) {
2060 return result;
2061 }
2062
2063 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2064 // variable (if present).
2065 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2066 if (result != JNI_OK) {
2067 return result;
2068 }
2069
2070 // Parse args structure generated from the command line flags.
2071 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2072 if (result != JNI_OK) {
2073 return result;
2074 }
2075
2076 // Parse args structure generated from the _JAVA_OPTIONS environment
2077 // variable (if present) (mimics classic VM)
2078 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2079 if (result != JNI_OK) {
2080 return result;
2081 }
2082
2083 // Disable CDS for exploded image
2084 if (!has_jimage()) {
2085 no_shared_spaces("CDS disabled on exploded JDK");
2086 }
2087
2088 // We need to ensure processor and memory resources have been properly
2089 // configured - which may rely on arguments we just processed - before
2090 // doing the final argument processing. Any argument processing that
2091 // needs to know about processor and memory resources must occur after
2092 // this point.
2093
2094 os::init_container_support();
2095
2096 SystemMemoryBarrier::initialize();
2097
2098 // Do final processing now that all arguments have been parsed
2099 result = finalize_vm_init_args(patch_mod_javabase);
2100 if (result != JNI_OK) {
2101 return result;
2102 }
2103
2104 return JNI_OK;
2105 }
2106
2107 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2108 // represents a valid JDWP agent. is_path==true denotes that we
2109 // are dealing with -agentpath (case where name is a path), otherwise with
2110 // -agentlib
2111 bool valid_jdwp_agent(char *name, bool is_path) {
2112 char *_name;
2113 const char *_jdwp = "jdwp";
2114 size_t _len_jdwp, _len_prefix;
2115
2116 if (is_path) {
2117 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2118 return false;
2119 }
2120
2121 _name++; // skip past last path separator
2122 _len_prefix = strlen(JNI_LIB_PREFIX);
2123
2124 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2125 return false;
2126 }
2127
2128 _name += _len_prefix;
2129 _len_jdwp = strlen(_jdwp);
2130
2131 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2132 _name += _len_jdwp;
2133 }
2134 else {
2135 return false;
2136 }
2137
2138 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2139 return false;
2140 }
2141
2142 return true;
2143 }
2144
2145 if (strcmp(name, _jdwp) == 0) {
2146 return true;
2147 }
2148
2149 return false;
2150 }
2151
2152 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2153 // --patch-module=<module>=<file>(<pathsep><file>)*
2154 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2155 // Find the equal sign between the module name and the path specification
2156 const char* module_equal = strchr(patch_mod_tail, '=');
2157 if (module_equal == nullptr) {
2158 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2159 return JNI_ERR;
2160 } else {
2161 // Pick out the module name
2162 size_t module_len = module_equal - patch_mod_tail;
2163 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2164 if (module_name != nullptr) {
2165 memcpy(module_name, patch_mod_tail, module_len);
2166 *(module_name + module_len) = '\0';
2167 // The path piece begins one past the module_equal sign
2168 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2169 FREE_C_HEAP_ARRAY(char, module_name);
2170 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2171 return JNI_ENOMEM;
2172 }
2173 } else {
2174 return JNI_ENOMEM;
2175 }
2176 }
2177 return JNI_OK;
2178 }
2179
2180 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2181 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2182 // The min and max sizes match the values in globals.hpp, but scaled
2183 // with K. The values have been chosen so that alignment with page
2184 // size doesn't change the max value, which makes the conversions
2185 // back and forth between Xss value and ThreadStackSize value easier.
2186 // The values have also been chosen to fit inside a 32-bit signed type.
2187 const julong min_ThreadStackSize = 0;
2188 const julong max_ThreadStackSize = 1 * M;
2189
2190 // Make sure the above values match the range set in globals.hpp
2191 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2192 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2193 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2194
2195 const julong min_size = min_ThreadStackSize * K;
2196 const julong max_size = max_ThreadStackSize * K;
2197
2198 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2199
2200 julong size = 0;
2201 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2202 if (errcode != arg_in_range) {
2203 bool silent = (option == nullptr); // Allow testing to silence error messages
2204 if (!silent) {
2205 jio_fprintf(defaultStream::error_stream(),
2206 "Invalid thread stack size: %s\n", option->optionString);
2207 describe_range_error(errcode);
2208 }
2209 return JNI_EINVAL;
2210 }
2211
2212 // Internally track ThreadStackSize in units of 1024 bytes.
2213 const julong size_aligned = align_up(size, K);
2214 assert(size <= size_aligned,
2215 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2216 size, size_aligned);
2217
2218 const julong size_in_K = size_aligned / K;
2219 assert(size_in_K < (julong)max_intx,
2220 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2221 size_in_K);
2222
2223 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2224 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2225 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2226 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2227 max_expanded, size_in_K);
2228
2229 *out_ThreadStackSize = (intx)size_in_K;
2230
2231 return JNI_OK;
2232 }
2233
2234 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2235 // For match_option to return remaining or value part of option string
2236 const char* tail;
2237
2238 // iterate over arguments
2239 for (int index = 0; index < args->nOptions; index++) {
2240 bool is_absolute_path = false; // for -agentpath vs -agentlib
2241
2242 const JavaVMOption* option = args->options + index;
2243
2244 if (!match_option(option, "-Djava.class.path", &tail) &&
2245 !match_option(option, "-Dsun.java.command", &tail) &&
2246 !match_option(option, "-Dsun.java.launcher", &tail)) {
2247
2248 // add all jvm options to the jvm_args string. This string
2249 // is used later to set the java.vm.args PerfData string constant.
2250 // the -Djava.class.path and the -Dsun.java.command options are
2251 // omitted from jvm_args string as each have their own PerfData
2252 // string constant object.
2253 build_jvm_args(option->optionString);
2254 }
2255
2256 // -verbose:[class/module/gc/jni]
2257 if (match_option(option, "-verbose", &tail)) {
2258 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2259 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2260 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2261 } else if (!strcmp(tail, ":module")) {
2262 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2263 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2264 } else if (!strcmp(tail, ":gc")) {
2265 if (_legacyGCLogging.lastFlag == 0) {
2266 _legacyGCLogging.lastFlag = 1;
2267 }
2268 } else if (!strcmp(tail, ":jni")) {
2269 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2270 }
2271 // -da / -ea / -disableassertions / -enableassertions
2272 // These accept an optional class/package name separated by a colon, e.g.,
2273 // -da:java.lang.Thread.
2274 } else if (match_option(option, user_assertion_options, &tail, true)) {
2275 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2276 if (*tail == '\0') {
2277 JavaAssertions::setUserClassDefault(enable);
2278 } else {
2279 assert(*tail == ':', "bogus match by match_option()");
2280 JavaAssertions::addOption(tail + 1, enable);
2281 }
2282 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2283 } else if (match_option(option, system_assertion_options, &tail, false)) {
2284 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2285 JavaAssertions::setSystemClassDefault(enable);
2286 // -bootclasspath:
2287 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2288 jio_fprintf(defaultStream::output_stream(),
2289 "-Xbootclasspath is no longer a supported option.\n");
2290 return JNI_EINVAL;
2291 // -bootclasspath/a:
2292 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2293 Arguments::append_sysclasspath(tail);
2294 #if INCLUDE_CDS
2295 MetaspaceShared::disable_optimized_module_handling();
2296 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2297 #endif
2298 // -bootclasspath/p:
2299 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2300 jio_fprintf(defaultStream::output_stream(),
2301 "-Xbootclasspath/p is no longer a supported option.\n");
2302 return JNI_EINVAL;
2303 // -Xrun
2304 } else if (match_option(option, "-Xrun", &tail)) {
2305 if (tail != nullptr) {
2306 const char* pos = strchr(tail, ':');
2307 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2308 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2309 jio_snprintf(name, len + 1, "%s", tail);
2310
2311 char *options = nullptr;
2312 if(pos != nullptr) {
2313 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2314 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2315 }
2316 #if !INCLUDE_JVMTI
2317 if (strcmp(name, "jdwp") == 0) {
2318 jio_fprintf(defaultStream::error_stream(),
2319 "Debugging agents are not supported in this VM\n");
2320 return JNI_ERR;
2321 }
2322 #endif // !INCLUDE_JVMTI
2323 JvmtiAgentList::add_xrun(name, options, false);
2324 FREE_C_HEAP_ARRAY(char, name);
2325 FREE_C_HEAP_ARRAY(char, options);
2326 }
2327 } else if (match_option(option, "--add-reads=", &tail)) {
2328 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2329 return JNI_ENOMEM;
2330 }
2331 } else if (match_option(option, "--add-exports=", &tail)) {
2332 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2333 return JNI_ENOMEM;
2334 }
2335 } else if (match_option(option, "--add-opens=", &tail)) {
2336 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2337 return JNI_ENOMEM;
2338 }
2339 } else if (match_option(option, "--add-modules=", &tail)) {
2340 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2341 return JNI_ENOMEM;
2342 }
2343 } else if (match_option(option, "--enable-native-access=", &tail)) {
2344 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2345 return JNI_ENOMEM;
2346 }
2347 } else if (match_option(option, "--limit-modules=", &tail)) {
2348 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2349 return JNI_ENOMEM;
2350 }
2351 } else if (match_option(option, "--module-path=", &tail)) {
2352 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2353 return JNI_ENOMEM;
2354 }
2355 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2356 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2357 return JNI_ENOMEM;
2358 }
2359 } else if (match_option(option, "--patch-module=", &tail)) {
2360 // --patch-module=<module>=<file>(<pathsep><file>)*
2361 int res = process_patch_mod_option(tail, patch_mod_javabase);
2362 if (res != JNI_OK) {
2363 return res;
2364 }
2365 } else if (match_option(option, "--illegal-access=", &tail)) {
2366 char version[256];
2367 JDK_Version::jdk(17).to_string(version, sizeof(version));
2368 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2369 // -agentlib and -agentpath
2370 } else if (match_option(option, "-agentlib:", &tail) ||
2371 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2372 if(tail != nullptr) {
2373 const char* pos = strchr(tail, '=');
2374 char* name;
2375 if (pos == nullptr) {
2376 name = os::strdup_check_oom(tail, mtArguments);
2377 } else {
2378 size_t len = pos - tail;
2379 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2380 memcpy(name, tail, len);
2381 name[len] = '\0';
2382 }
2383
2384 char *options = nullptr;
2385 if(pos != nullptr) {
2386 options = os::strdup_check_oom(pos + 1, mtArguments);
2387 }
2388 #if !INCLUDE_JVMTI
2389 if (valid_jdwp_agent(name, is_absolute_path)) {
2390 jio_fprintf(defaultStream::error_stream(),
2391 "Debugging agents are not supported in this VM\n");
2392 return JNI_ERR;
2393 }
2394 #endif // !INCLUDE_JVMTI
2395 JvmtiAgentList::add(name, options, is_absolute_path);
2396 os::free(name);
2397 os::free(options);
2398 }
2399 // -javaagent
2400 } else if (match_option(option, "-javaagent:", &tail)) {
2401 #if !INCLUDE_JVMTI
2402 jio_fprintf(defaultStream::error_stream(),
2403 "Instrumentation agents are not supported in this VM\n");
2404 return JNI_ERR;
2405 #else
2406 if (tail != nullptr) {
2407 size_t length = strlen(tail) + 1;
2408 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2409 jio_snprintf(options, length, "%s", tail);
2410 JvmtiAgentList::add("instrument", options, false);
2411 FREE_C_HEAP_ARRAY(char, options);
2412
2413 // java agents need module java.instrument
2414 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2415 return JNI_ENOMEM;
2416 }
2417 }
2418 #endif // !INCLUDE_JVMTI
2419 // --enable_preview
2420 } else if (match_option(option, "--enable-preview")) {
2421 set_enable_preview();
2422 // -Xnoclassgc
2423 } else if (match_option(option, "-Xnoclassgc")) {
2424 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2425 return JNI_EINVAL;
2426 }
2427 // -Xbatch
2428 } else if (match_option(option, "-Xbatch")) {
2429 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2430 return JNI_EINVAL;
2431 }
2432 // -Xmn for compatibility with other JVM vendors
2433 } else if (match_option(option, "-Xmn", &tail)) {
2434 julong long_initial_young_size = 0;
2435 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2436 if (errcode != arg_in_range) {
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Invalid initial young generation size: %s\n", option->optionString);
2439 describe_range_error(errcode);
2440 return JNI_EINVAL;
2441 }
2442 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2443 return JNI_EINVAL;
2444 }
2445 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2446 return JNI_EINVAL;
2447 }
2448 // -Xms
2449 } else if (match_option(option, "-Xms", &tail)) {
2450 julong size = 0;
2451 // an initial heap size of 0 means automatically determine
2452 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2453 if (errcode != arg_in_range) {
2454 jio_fprintf(defaultStream::error_stream(),
2455 "Invalid initial heap size: %s\n", option->optionString);
2456 describe_range_error(errcode);
2457 return JNI_EINVAL;
2458 }
2459 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2460 return JNI_EINVAL;
2461 }
2462 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2463 return JNI_EINVAL;
2464 }
2465 // -Xmx
2466 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2467 julong long_max_heap_size = 0;
2468 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2469 if (errcode != arg_in_range) {
2470 jio_fprintf(defaultStream::error_stream(),
2471 "Invalid maximum heap size: %s\n", option->optionString);
2472 describe_range_error(errcode);
2473 return JNI_EINVAL;
2474 }
2475 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2476 return JNI_EINVAL;
2477 }
2478 // Xmaxf
2479 } else if (match_option(option, "-Xmaxf", &tail)) {
2480 char* err;
2481 int maxf = (int)(strtod(tail, &err) * 100);
2482 if (*err != '\0' || *tail == '\0') {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Bad max heap free percentage size: %s\n",
2485 option->optionString);
2486 return JNI_EINVAL;
2487 } else {
2488 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2489 return JNI_EINVAL;
2490 }
2491 }
2492 // Xminf
2493 } else if (match_option(option, "-Xminf", &tail)) {
2494 char* err;
2495 int minf = (int)(strtod(tail, &err) * 100);
2496 if (*err != '\0' || *tail == '\0') {
2497 jio_fprintf(defaultStream::error_stream(),
2498 "Bad min heap free percentage size: %s\n",
2499 option->optionString);
2500 return JNI_EINVAL;
2501 } else {
2502 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2503 return JNI_EINVAL;
2504 }
2505 }
2506 // -Xss
2507 } else if (match_option(option, "-Xss", &tail)) {
2508 intx value = 0;
2509 jint err = parse_xss(option, tail, &value);
2510 if (err != JNI_OK) {
2511 return err;
2512 }
2513 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2514 return JNI_EINVAL;
2515 }
2516 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2517 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2518 julong long_ReservedCodeCacheSize = 0;
2519
2520 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2521 if (errcode != arg_in_range) {
2522 jio_fprintf(defaultStream::error_stream(),
2523 "Invalid maximum code cache size: %s.\n", option->optionString);
2524 return JNI_EINVAL;
2525 }
2526 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2527 return JNI_EINVAL;
2528 }
2529 // -green
2530 } else if (match_option(option, "-green")) {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Green threads support not available\n");
2533 return JNI_EINVAL;
2534 // -native
2535 } else if (match_option(option, "-native")) {
2536 // HotSpot always uses native threads, ignore silently for compatibility
2537 // -Xrs
2538 } else if (match_option(option, "-Xrs")) {
2539 // Classic/EVM option, new functionality
2540 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2541 return JNI_EINVAL;
2542 }
2543 // -Xprof
2544 } else if (match_option(option, "-Xprof")) {
2545 char version[256];
2546 // Obsolete in JDK 10
2547 JDK_Version::jdk(10).to_string(version, sizeof(version));
2548 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2549 // -Xinternalversion
2550 } else if (match_option(option, "-Xinternalversion")) {
2551 jio_fprintf(defaultStream::output_stream(), "%s\n",
2552 VM_Version::internal_vm_info_string());
2553 vm_exit(0);
2554 #ifndef PRODUCT
2555 // -Xprintflags
2556 } else if (match_option(option, "-Xprintflags")) {
2557 JVMFlag::printFlags(tty, false);
2558 vm_exit(0);
2559 #endif
2560 // -D
2561 } else if (match_option(option, "-D", &tail)) {
2562 const char* value;
2563 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2564 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2565 // abort if -Djava.endorsed.dirs is set
2566 jio_fprintf(defaultStream::output_stream(),
2567 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2568 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2569 return JNI_EINVAL;
2570 }
2571 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2572 *value != '\0' && strcmp(value, "\"\"") != 0) {
2573 // abort if -Djava.ext.dirs is set
2574 jio_fprintf(defaultStream::output_stream(),
2575 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2576 return JNI_EINVAL;
2577 }
2578 // Check for module related properties. They must be set using the modules
2579 // options. For example: use "--add-modules=java.sql", not
2580 // "-Djdk.module.addmods=java.sql"
2581 if (is_internal_module_property(option->optionString + 2)) {
2582 needs_module_property_warning = true;
2583 continue;
2584 }
2585 if (!add_property(tail)) {
2586 return JNI_ENOMEM;
2587 }
2588 // Out of the box management support
2589 if (match_option(option, "-Dcom.sun.management", &tail)) {
2590 #if INCLUDE_MANAGEMENT
2591 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2592 return JNI_EINVAL;
2593 }
2594 // management agent in module jdk.management.agent
2595 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2596 return JNI_ENOMEM;
2597 }
2598 #else
2599 jio_fprintf(defaultStream::output_stream(),
2600 "-Dcom.sun.management is not supported in this VM.\n");
2601 return JNI_ERR;
2602 #endif
2603 }
2604 // -Xint
2605 } else if (match_option(option, "-Xint")) {
2606 set_mode_flags(_int);
2607 // -Xmixed
2608 } else if (match_option(option, "-Xmixed")) {
2609 set_mode_flags(_mixed);
2610 // -Xcomp
2611 } else if (match_option(option, "-Xcomp")) {
2612 // for testing the compiler; turn off all flags that inhibit compilation
2613 set_mode_flags(_comp);
2614 // -Xshare:dump
2615 } else if (match_option(option, "-Xshare:dump")) {
2616 DumpSharedSpaces = true;
2617 // -Xshare:on
2618 } else if (match_option(option, "-Xshare:on")) {
2619 UseSharedSpaces = true;
2620 RequireSharedSpaces = true;
2621 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2622 } else if (match_option(option, "-Xshare:auto")) {
2623 UseSharedSpaces = true;
2624 RequireSharedSpaces = false;
2625 xshare_auto_cmd_line = true;
2626 // -Xshare:off
2627 } else if (match_option(option, "-Xshare:off")) {
2628 UseSharedSpaces = false;
2629 RequireSharedSpaces = false;
2630 // -Xverify
2631 } else if (match_option(option, "-Xverify", &tail)) {
2632 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2633 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2634 return JNI_EINVAL;
2635 }
2636 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2637 return JNI_EINVAL;
2638 }
2639 } else if (strcmp(tail, ":remote") == 0) {
2640 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2641 return JNI_EINVAL;
2642 }
2643 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 } else if (strcmp(tail, ":none") == 0) {
2647 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2648 return JNI_EINVAL;
2649 }
2650 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2651 return JNI_EINVAL;
2652 }
2653 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2654 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2655 return JNI_EINVAL;
2656 }
2657 // -Xdebug
2658 } else if (match_option(option, "-Xdebug")) {
2659 // note this flag has been used, then ignore
2660 set_xdebug_mode(true);
2661 // -Xnoagent
2662 } else if (match_option(option, "-Xnoagent")) {
2663 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2664 } else if (match_option(option, "-Xloggc:", &tail)) {
2665 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2666 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2667 _legacyGCLogging.lastFlag = 2;
2668 _legacyGCLogging.file = os::strdup_check_oom(tail);
2669 } else if (match_option(option, "-Xlog", &tail)) {
2670 bool ret = false;
2671 if (strcmp(tail, ":help") == 0) {
2672 fileStream stream(defaultStream::output_stream());
2673 LogConfiguration::print_command_line_help(&stream);
2674 vm_exit(0);
2675 } else if (strcmp(tail, ":disable") == 0) {
2676 LogConfiguration::disable_logging();
2677 ret = true;
2678 } else if (strcmp(tail, ":async") == 0) {
2679 LogConfiguration::set_async_mode(true);
2680 ret = true;
2681 } else if (*tail == '\0') {
2682 ret = LogConfiguration::parse_command_line_arguments();
2683 assert(ret, "-Xlog without arguments should never fail to parse");
2684 } else if (*tail == ':') {
2685 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2686 }
2687 if (ret == false) {
2688 jio_fprintf(defaultStream::error_stream(),
2689 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2690 tail);
2691 return JNI_EINVAL;
2692 }
2693 // JNI hooks
2694 } else if (match_option(option, "-Xcheck", &tail)) {
2695 if (!strcmp(tail, ":jni")) {
2696 #if !INCLUDE_JNI_CHECK
2697 warning("JNI CHECKING is not supported in this VM");
2698 #else
2699 CheckJNICalls = true;
2700 #endif // INCLUDE_JNI_CHECK
2701 } else if (is_bad_option(option, args->ignoreUnrecognized,
2702 "check")) {
2703 return JNI_EINVAL;
2704 }
2705 } else if (match_option(option, "vfprintf")) {
2706 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2707 } else if (match_option(option, "exit")) {
2708 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2709 } else if (match_option(option, "abort")) {
2710 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2711 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2712 // and the last option wins.
2713 } else if (match_option(option, "-XX:+NeverTenure")) {
2714 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2715 return JNI_EINVAL;
2716 }
2717 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2718 return JNI_EINVAL;
2719 }
2720 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2724 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2734 uintx max_tenuring_thresh = 0;
2735 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2738 return JNI_EINVAL;
2739 }
2740
2741 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744
2745 if (MaxTenuringThreshold == 0) {
2746 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 } else {
2753 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 }
2760 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2761 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2765 return JNI_EINVAL;
2766 }
2767 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2768 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2769 return JNI_EINVAL;
2770 }
2771 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2772 return JNI_EINVAL;
2773 }
2774 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2775 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2779 return JNI_EINVAL;
2780 }
2781 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2782 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2783 return JNI_EINVAL;
2784 }
2785 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2786 return JNI_EINVAL;
2787 }
2788 } else if (match_option(option, "--finalization=", &tail)) {
2789 if (strcmp(tail, "enabled") == 0) {
2790 InstanceKlass::set_finalization_enabled(true);
2791 } else if (strcmp(tail, "disabled") == 0) {
2792 InstanceKlass::set_finalization_enabled(false);
2793 } else {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2796 tail);
2797 return JNI_EINVAL;
2798 }
2799 #if !defined(DTRACE_ENABLED)
2800 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2801 jio_fprintf(defaultStream::error_stream(),
2802 "DTraceMethodProbes flag is not applicable for this configuration\n");
2803 return JNI_EINVAL;
2804 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2805 jio_fprintf(defaultStream::error_stream(),
2806 "DTraceAllocProbes flag is not applicable for this configuration\n");
2807 return JNI_EINVAL;
2808 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2811 return JNI_EINVAL;
2812 #endif // !defined(DTRACE_ENABLED)
2813 #ifdef ASSERT
2814 } else if (match_option(option, "-XX:+FullGCALot")) {
2815 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2816 return JNI_EINVAL;
2817 }
2818 // disable scavenge before parallel mark-compact
2819 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2820 return JNI_EINVAL;
2821 }
2822 #endif
2823 #if !INCLUDE_MANAGEMENT
2824 } else if (match_option(option, "-XX:+ManagementServer")) {
2825 jio_fprintf(defaultStream::error_stream(),
2826 "ManagementServer is not supported in this VM.\n");
2827 return JNI_ERR;
2828 #endif // INCLUDE_MANAGEMENT
2829 #if INCLUDE_JVMCI
2830 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2831 if (EnableJVMCIProduct) {
2832 jio_fprintf(defaultStream::error_stream(),
2833 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2834 return JNI_EINVAL;
2835 }
2836 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2837 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2838 if (use_graal_jit) {
2839 const char* jvmci_compiler = get_property("jvmci.Compiler");
2840 if (jvmci_compiler != nullptr) {
2841 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s", jvmci_compiler);
2844 return JNI_ERR;
2845 }
2846 } else if (!add_property("jvmci.Compiler=graal")) {
2847 return JNI_ENOMEM;
2848 }
2849 }
2850
2851 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2852 if (EnableJVMCIProduct) {
2853 continue;
2854 }
2855 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2856 // Allow this flag if it has been unlocked.
2857 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2858 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2859 jio_fprintf(defaultStream::error_stream(),
2860 "Unable to enable JVMCI in product mode");
2861 return JNI_ERR;
2862 }
2863 }
2864 // The flag was locked so process normally to report that error
2865 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2866 return JNI_EINVAL;
2867 }
2868 #endif // INCLUDE_JVMCI
2869 #if INCLUDE_JFR
2870 } else if (match_jfr_option(&option)) {
2871 return JNI_EINVAL;
2872 #endif
2873 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2874 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2875 // already been handled
2876 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2877 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2878 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2879 return JNI_EINVAL;
2880 }
2881 }
2882 // Unknown option
2883 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2884 return JNI_ERR;
2885 }
2886 }
2887
2888 // PrintSharedArchiveAndExit will turn on
2889 // -Xshare:on
2890 // -Xlog:class+path=info
2891 if (PrintSharedArchiveAndExit) {
2892 UseSharedSpaces = true;
2893 RequireSharedSpaces = true;
2894 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2895 }
2896
2897 fix_appclasspath();
2898
2899 return JNI_OK;
2900 }
2901
2902 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2903 // For java.base check for duplicate --patch-module options being specified on the command line.
2904 // This check is only required for java.base, all other duplicate module specifications
2905 // will be checked during module system initialization. The module system initialization
2906 // will throw an ExceptionInInitializerError if this situation occurs.
2907 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2908 if (*patch_mod_javabase) {
2909 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2910 } else {
2911 *patch_mod_javabase = true;
2912 }
2913 }
2914
2915 // Create GrowableArray lazily, only if --patch-module has been specified
2916 if (_patch_mod_prefix == nullptr) {
2917 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2918 }
2919
2920 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2921 }
2922
2923 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2924 //
2925 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2926 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2927 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2928 // path is treated as the current directory.
2929 //
2930 // This causes problems with CDS, which requires that all directories specified in the classpath
2931 // must be empty. In most cases, applications do NOT want to load classes from the current
2932 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2933 // scripts compatible with CDS.
2934 void Arguments::fix_appclasspath() {
2935 if (IgnoreEmptyClassPaths) {
2936 const char separator = *os::path_separator();
2937 const char* src = _java_class_path->value();
2938
2939 // skip over all the leading empty paths
2940 while (*src == separator) {
2941 src ++;
2942 }
2943
2944 char* copy = os::strdup_check_oom(src, mtArguments);
2945
2946 // trim all trailing empty paths
2947 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2948 *tail = '\0';
2949 }
2950
2951 char from[3] = {separator, separator, '\0'};
2952 char to [2] = {separator, '\0'};
2953 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2954 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2955 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2956 }
2957
2958 _java_class_path->set_writeable_value(copy);
2959 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2960 }
2961 }
2962
2963 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2964 // check if the default lib/endorsed directory exists; if so, error
2965 char path[JVM_MAXPATHLEN];
2966 const char* fileSep = os::file_separator();
2967 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2968
2969 DIR* dir = os::opendir(path);
2970 if (dir != nullptr) {
2971 jio_fprintf(defaultStream::output_stream(),
2972 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2973 "in modular form will be supported via the concept of upgradeable modules.\n");
2974 os::closedir(dir);
2975 return JNI_ERR;
2976 }
2977
2978 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2979 dir = os::opendir(path);
2980 if (dir != nullptr) {
2981 jio_fprintf(defaultStream::output_stream(),
2982 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2983 "Use -classpath instead.\n.");
2984 os::closedir(dir);
2985 return JNI_ERR;
2986 }
2987
2988 // This must be done after all arguments have been processed
2989 // and the container support has been initialized since AggressiveHeap
2990 // relies on the amount of total memory available.
2991 if (AggressiveHeap) {
2992 jint result = set_aggressive_heap_flags();
2993 if (result != JNI_OK) {
2994 return result;
2995 }
2996 }
2997
2998 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2999 // but like -Xint, leave compilation thresholds unaffected.
3000 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3001 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3002 set_mode_flags(_int);
3003 }
3004
3005 #ifdef ZERO
3006 // Zero always runs in interpreted mode
3007 set_mode_flags(_int);
3008 #endif
3009
3010 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3011 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3012 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3013 }
3014
3015 #if !COMPILER2_OR_JVMCI
3016 // Don't degrade server performance for footprint
3017 if (FLAG_IS_DEFAULT(UseLargePages) &&
3018 MaxHeapSize < LargePageHeapSizeThreshold) {
3019 // No need for large granularity pages w/small heaps.
3020 // Note that large pages are enabled/disabled for both the
3021 // Java heap and the code cache.
3022 FLAG_SET_DEFAULT(UseLargePages, false);
3023 }
3024
3025 UNSUPPORTED_OPTION(ProfileInterpreter);
3026 #endif
3027
3028 // Parse the CompilationMode flag
3029 if (!CompilationModeFlag::initialize()) {
3030 return JNI_ERR;
3031 }
3032
3033 if (!check_vm_args_consistency()) {
3034 return JNI_ERR;
3035 }
3036
3037 #if INCLUDE_CDS
3038 if (DumpSharedSpaces) {
3039 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3040 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable
3041 // compiler just to be safe.
3042 //
3043 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the
3044 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler.
3045 // TODO: revisit the following for the static archive case.
3046 set_mode_flags(_int);
3047
3048 // String deduplication may cause CDS to iterate the strings in different order from one
3049 // run to another which resulting in non-determinstic CDS archives.
3050 // Disable UseStringDeduplication while dumping CDS archive.
3051 UseStringDeduplication = false;
3052 }
3053
3054 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
3055 if (ArchiveClassesAtExit != nullptr && RecordDynamicDumpInfo) {
3056 jio_fprintf(defaultStream::output_stream(),
3057 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
3058 return JNI_ERR;
3059 }
3060
3061 if (ArchiveClassesAtExit == nullptr && !RecordDynamicDumpInfo) {
3062 DynamicDumpSharedSpaces = false;
3063 } else {
3064 DynamicDumpSharedSpaces = true;
3065 }
3066
3067 if (AutoCreateSharedArchive) {
3068 if (SharedArchiveFile == nullptr) {
3069 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
3070 return JNI_ERR;
3071 }
3072 if (ArchiveClassesAtExit != nullptr) {
3073 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
3074 return JNI_ERR;
3075 }
3076 }
3077
3078 if (UseSharedSpaces && patch_mod_javabase) {
3079 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3080 }
3081 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3082 UseSharedSpaces = false;
3083 }
3084
3085 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
3086 // Always verify non-system classes during CDS dump
3087 if (!BytecodeVerificationRemote) {
3088 BytecodeVerificationRemote = true;
3089 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3090 }
3091 }
3092 #endif
3093
3094 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3095 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3096 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3097
3098 #ifdef _LP64
3099 if (UseCompactObjectHeaders && UseZGC && !ZGenerational) {
3100 warning("Single-generational ZGC does not work with compact object headers, disabling UseCompactObjectHeaders");
3101 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3102 }
3103 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3104 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3105 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3106 }
3107 if (UseCompactObjectHeaders && LockingMode == LM_LEGACY) {
3108 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3109 }
3110 if (UseCompactObjectHeaders && !UseAltGCForwarding) {
3111 FLAG_SET_DEFAULT(UseAltGCForwarding, true);
3112 }
3113 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3114 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3115 }
3116 #endif
3117
3118 return JNI_OK;
3119 }
3120
3121 // Helper class for controlling the lifetime of JavaVMInitArgs
3122 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3123 // deleted on the destruction of the ScopedVMInitArgs object.
3124 class ScopedVMInitArgs : public StackObj {
3125 private:
3126 JavaVMInitArgs _args;
3127 char* _container_name;
3128 bool _is_set;
3129 char* _vm_options_file_arg;
3130
3131 public:
3132 ScopedVMInitArgs(const char *container_name) {
3133 _args.version = JNI_VERSION_1_2;
3134 _args.nOptions = 0;
3135 _args.options = nullptr;
3136 _args.ignoreUnrecognized = false;
3137 _container_name = (char *)container_name;
3138 _is_set = false;
3139 _vm_options_file_arg = nullptr;
3140 }
3141
3142 // Populates the JavaVMInitArgs object represented by this
3143 // ScopedVMInitArgs object with the arguments in options. The
3144 // allocated memory is deleted by the destructor. If this method
3145 // returns anything other than JNI_OK, then this object is in a
3146 // partially constructed state, and should be abandoned.
3147 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3148 _is_set = true;
3149 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3150 JavaVMOption, options->length(), mtArguments);
3151 if (options_arr == nullptr) {
3152 return JNI_ENOMEM;
3153 }
3154 _args.options = options_arr;
3155
3156 for (int i = 0; i < options->length(); i++) {
3157 options_arr[i] = options->at(i);
3158 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3159 if (options_arr[i].optionString == nullptr) {
3160 // Rely on the destructor to do cleanup.
3161 _args.nOptions = i;
3162 return JNI_ENOMEM;
3163 }
3164 }
3165
3166 _args.nOptions = options->length();
3167 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3168 return JNI_OK;
3169 }
3170
3171 JavaVMInitArgs* get() { return &_args; }
3172 char* container_name() { return _container_name; }
3173 bool is_set() { return _is_set; }
3174 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3175 char* vm_options_file_arg() { return _vm_options_file_arg; }
3176
3177 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3178 if (_vm_options_file_arg != nullptr) {
3179 os::free(_vm_options_file_arg);
3180 }
3181 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3182 }
3183
3184 ~ScopedVMInitArgs() {
3185 if (_vm_options_file_arg != nullptr) {
3186 os::free(_vm_options_file_arg);
3187 }
3188 if (_args.options == nullptr) return;
3189 for (int i = 0; i < _args.nOptions; i++) {
3190 os::free(_args.options[i].optionString);
3191 }
3192 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3193 }
3194
3195 // Insert options into this option list, to replace option at
3196 // vm_options_file_pos (-XX:VMOptionsFile)
3197 jint insert(const JavaVMInitArgs* args,
3198 const JavaVMInitArgs* args_to_insert,
3199 const int vm_options_file_pos) {
3200 assert(_args.options == nullptr, "shouldn't be set yet");
3201 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3202 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3203
3204 int length = args->nOptions + args_to_insert->nOptions - 1;
3205 // Construct new option array
3206 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3207 for (int i = 0; i < args->nOptions; i++) {
3208 if (i == vm_options_file_pos) {
3209 // insert the new options starting at the same place as the
3210 // -XX:VMOptionsFile option
3211 for (int j = 0; j < args_to_insert->nOptions; j++) {
3212 options.push(args_to_insert->options[j]);
3213 }
3214 } else {
3215 options.push(args->options[i]);
3216 }
3217 }
3218 // make into options array
3219 return set_args(&options);
3220 }
3221 };
3222
3223 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3224 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3225 }
3226
3227 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3228 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3229 }
3230
3231 jint Arguments::parse_options_environment_variable(const char* name,
3232 ScopedVMInitArgs* vm_args) {
3233 char *buffer = ::getenv(name);
3234
3235 // Don't check this environment variable if user has special privileges
3236 // (e.g. unix su command).
3237 if (buffer == nullptr || os::have_special_privileges()) {
3238 return JNI_OK;
3239 }
3240
3241 if ((buffer = os::strdup(buffer)) == nullptr) {
3242 return JNI_ENOMEM;
3243 }
3244
3245 jio_fprintf(defaultStream::error_stream(),
3246 "Picked up %s: %s\n", name, buffer);
3247
3248 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3249
3250 os::free(buffer);
3251 return retcode;
3252 }
3253
3254 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3255 // read file into buffer
3256 int fd = ::open(file_name, O_RDONLY);
3257 if (fd < 0) {
3258 jio_fprintf(defaultStream::error_stream(),
3259 "Could not open options file '%s'\n",
3260 file_name);
3261 return JNI_ERR;
3262 }
3263
3264 struct stat stbuf;
3265 int retcode = os::stat(file_name, &stbuf);
3266 if (retcode != 0) {
3267 jio_fprintf(defaultStream::error_stream(),
3268 "Could not stat options file '%s'\n",
3269 file_name);
3270 ::close(fd);
3271 return JNI_ERR;
3272 }
3273
3274 if (stbuf.st_size == 0) {
3275 // tell caller there is no option data and that is ok
3276 ::close(fd);
3277 return JNI_OK;
3278 }
3279
3280 // '+ 1' for null termination even with max bytes
3281 size_t bytes_alloc = stbuf.st_size + 1;
3282
3283 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3284 if (nullptr == buf) {
3285 jio_fprintf(defaultStream::error_stream(),
3286 "Could not allocate read buffer for options file parse\n");
3287 ::close(fd);
3288 return JNI_ENOMEM;
3289 }
3290
3291 memset(buf, 0, bytes_alloc);
3292
3293 // Fill buffer
3294 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3295 ::close(fd);
3296 if (bytes_read < 0) {
3297 FREE_C_HEAP_ARRAY(char, buf);
3298 jio_fprintf(defaultStream::error_stream(),
3299 "Could not read options file '%s'\n", file_name);
3300 return JNI_ERR;
3301 }
3302
3303 if (bytes_read == 0) {
3304 // tell caller there is no option data and that is ok
3305 FREE_C_HEAP_ARRAY(char, buf);
3306 return JNI_OK;
3307 }
3308
3309 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3310
3311 FREE_C_HEAP_ARRAY(char, buf);
3312 return retcode;
3313 }
3314
3315 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3316 // Construct option array
3317 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3318
3319 // some pointers to help with parsing
3320 char *buffer_end = buffer + buf_len;
3321 char *opt_hd = buffer;
3322 char *wrt = buffer;
3323 char *rd = buffer;
3324
3325 // parse all options
3326 while (rd < buffer_end) {
3327 // skip leading white space from the input string
3328 while (rd < buffer_end && isspace(*rd)) {
3329 rd++;
3330 }
3331
3332 if (rd >= buffer_end) {
3333 break;
3334 }
3335
3336 // Remember this is where we found the head of the token.
3337 opt_hd = wrt;
3338
3339 // Tokens are strings of non white space characters separated
3340 // by one or more white spaces.
3341 while (rd < buffer_end && !isspace(*rd)) {
3342 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3343 int quote = *rd; // matching quote to look for
3344 rd++; // don't copy open quote
3345 while (rd < buffer_end && *rd != quote) {
3346 // include everything (even spaces)
3347 // up until the close quote
3348 *wrt++ = *rd++; // copy to option string
3349 }
3350
3351 if (rd < buffer_end) {
3352 rd++; // don't copy close quote
3353 } else {
3354 // did not see closing quote
3355 jio_fprintf(defaultStream::error_stream(),
3356 "Unmatched quote in %s\n", name);
3357 return JNI_ERR;
3358 }
3359 } else {
3360 *wrt++ = *rd++; // copy to option string
3361 }
3362 }
3363
3364 // steal a white space character and set it to null
3365 *wrt++ = '\0';
3366 // We now have a complete token
3367
3368 JavaVMOption option;
3369 option.optionString = opt_hd;
3370 option.extraInfo = nullptr;
3371
3372 options.append(option); // Fill in option
3373
3374 rd++; // Advance to next character
3375 }
3376
3377 // Fill out JavaVMInitArgs structure.
3378 return vm_args->set_args(&options);
3379 }
3380
3381 void Arguments::set_shared_spaces_flags_and_archive_paths() {
3382 if (DumpSharedSpaces) {
3383 if (RequireSharedSpaces) {
3384 warning("Cannot dump shared archive while using shared archive");
3385 }
3386 UseSharedSpaces = false;
3387 }
3388 #if INCLUDE_CDS
3389 // Initialize shared archive paths which could include both base and dynamic archive paths
3390 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3391 //
3392 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
3393 if (DumpSharedSpaces || UseSharedSpaces) {
3394 init_shared_archive_paths();
3395 }
3396 #endif // INCLUDE_CDS
3397 }
3398
3399 #if INCLUDE_CDS
3400 // Sharing support
3401 // Construct the path to the archive
3402 char* Arguments::get_default_shared_archive_path() {
3403 if (_default_shared_archive_path == nullptr) {
3404 char jvm_path[JVM_MAXPATHLEN];
3405 os::jvm_path(jvm_path, sizeof(jvm_path));
3406 char *end = strrchr(jvm_path, *os::file_separator());
3407 if (end != nullptr) *end = '\0';
3408 size_t jvm_path_len = strlen(jvm_path);
3409 size_t file_sep_len = strlen(os::file_separator());
3410 const size_t len = jvm_path_len + file_sep_len + 20;
3411 _default_shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3412 jio_snprintf(_default_shared_archive_path, len,
3413 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
3414 jvm_path, os::file_separator());
3415 }
3416 return _default_shared_archive_path;
3417 }
3418
3419 int Arguments::num_archives(const char* archive_path) {
3420 if (archive_path == nullptr) {
3421 return 0;
3422 }
3423 int npaths = 1;
3424 char* p = (char*)archive_path;
3425 while (*p != '\0') {
3426 if (*p == os::path_separator()[0]) {
3427 npaths++;
3428 }
3429 p++;
3430 }
3431 return npaths;
3432 }
3433
3434 void Arguments::extract_shared_archive_paths(const char* archive_path,
3435 char** base_archive_path,
3436 char** top_archive_path) {
3437 char* begin_ptr = (char*)archive_path;
3438 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3439 if (end_ptr == nullptr || end_ptr == begin_ptr) {
3440 vm_exit_during_initialization("Base archive was not specified", archive_path);
3441 }
3442 size_t len = end_ptr - begin_ptr;
3443 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3444 strncpy(cur_path, begin_ptr, len);
3445 cur_path[len] = '\0';
3446 *base_archive_path = cur_path;
3447
3448 begin_ptr = ++end_ptr;
3449 if (*begin_ptr == '\0') {
3450 vm_exit_during_initialization("Top archive was not specified", archive_path);
3451 }
3452 end_ptr = strchr(begin_ptr, '\0');
3453 assert(end_ptr != nullptr, "sanity");
3454 len = end_ptr - begin_ptr;
3455 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3456 strncpy(cur_path, begin_ptr, len + 1);
3457 *top_archive_path = cur_path;
3458 }
3459
3460 void Arguments::init_shared_archive_paths() {
3461 if (ArchiveClassesAtExit != nullptr) {
3462 assert(!RecordDynamicDumpInfo, "already checked");
3463 if (DumpSharedSpaces) {
3464 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3465 }
3466 check_unsupported_dumping_properties();
3467
3468 if (os::same_files(get_default_shared_archive_path(), ArchiveClassesAtExit)) {
3469 vm_exit_during_initialization(
3470 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path());
3471 }
3472 }
3473
3474 if (SharedArchiveFile == nullptr) {
3475 SharedArchivePath = get_default_shared_archive_path();
3476 } else {
3477 int archives = num_archives(SharedArchiveFile);
3478 assert(archives > 0, "must be");
3479
3480 if (is_dumping_archive() && archives > 1) {
3481 vm_exit_during_initialization(
3482 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3483 }
3484
3485 if (DumpSharedSpaces) {
3486 assert(archives == 1, "must be");
3487 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
3488 // will be overwritten no matter regardless of its contents
3489 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3490 } else {
3491 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
3492 // is read from top.jsa
3493 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
3494 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
3495 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
3496 //
3497 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
3498 // allow cases (b) and (c). Case (b) is already checked above.
3499
3500 if (archives > 2) {
3501 vm_exit_during_initialization(
3502 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3503 }
3504 if (archives == 1) {
3505 char* base_archive_path = nullptr;
3506 bool success =
3507 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
3508 if (!success) {
3509 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
3510 // regenerate the dynamic archive base on default archive.
3511 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
3512 DynamicDumpSharedSpaces = true;
3513 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
3514 SharedArchivePath = get_default_shared_archive_path();
3515 SharedArchiveFile = nullptr;
3516 } else {
3517 if (AutoCreateSharedArchive) {
3518 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
3519 AutoCreateSharedArchive = false;
3520 }
3521 no_shared_spaces("invalid archive");
3522 }
3523 } else if (base_archive_path == nullptr) {
3524 // User has specified a single archive, which is a static archive.
3525 SharedArchivePath = const_cast<char *>(SharedArchiveFile);
3526 } else {
3527 // User has specified a single archive, which is a dynamic archive.
3528 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile);
3529 SharedArchivePath = base_archive_path; // has been c-heap allocated.
3530 }
3531 } else {
3532 extract_shared_archive_paths((const char*)SharedArchiveFile,
3533 &SharedArchivePath, &SharedDynamicArchivePath);
3534 if (SharedArchivePath == nullptr) {
3535 assert(SharedDynamicArchivePath == nullptr, "must be");
3536 no_shared_spaces("invalid archive");
3537 }
3538 }
3539
3540 if (SharedDynamicArchivePath != nullptr) {
3541 // Check for case (c)
3542 if (RecordDynamicDumpInfo) {
3543 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3544 SharedArchiveFile);
3545 }
3546 if (ArchiveClassesAtExit != nullptr) {
3547 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3548 SharedArchiveFile);
3549 }
3550 }
3551
3552 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3553 vm_exit_during_initialization(
3554 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3555 SharedArchiveFile);
3556 }
3557 }
3558 }
3559 }
3560 #endif // INCLUDE_CDS
3561
3562 #ifndef PRODUCT
3563 // Determine whether LogVMOutput should be implicitly turned on.
3564 static bool use_vm_log() {
3565 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3566 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3567 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3568 PrintAssembly || TraceDeoptimization ||
3569 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3570 return true;
3571 }
3572
3573 #ifdef COMPILER1
3574 if (PrintC1Statistics) {
3575 return true;
3576 }
3577 #endif // COMPILER1
3578
3579 #ifdef COMPILER2
3580 if (PrintOptoAssembly || PrintOptoStatistics) {
3581 return true;
3582 }
3583 #endif // COMPILER2
3584
3585 return false;
3586 }
3587
3588 #endif // PRODUCT
3589
3590 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3591 for (int index = 0; index < args->nOptions; index++) {
3592 const JavaVMOption* option = args->options + index;
3593 const char* tail;
3594 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3595 return true;
3596 }
3597 }
3598 return false;
3599 }
3600
3601 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3602 const char* vm_options_file,
3603 const int vm_options_file_pos,
3604 ScopedVMInitArgs* vm_options_file_args,
3605 ScopedVMInitArgs* args_out) {
3606 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3607 if (code != JNI_OK) {
3608 return code;
3609 }
3610
3611 if (vm_options_file_args->get()->nOptions < 1) {
3612 return JNI_OK;
3613 }
3614
3615 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3616 jio_fprintf(defaultStream::error_stream(),
3617 "A VM options file may not refer to a VM options file. "
3618 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3619 "options file '%s' in options container '%s' is an error.\n",
3620 vm_options_file_args->vm_options_file_arg(),
3621 vm_options_file_args->container_name());
3622 return JNI_EINVAL;
3623 }
3624
3625 return args_out->insert(args, vm_options_file_args->get(),
3626 vm_options_file_pos);
3627 }
3628
3629 // Expand -XX:VMOptionsFile found in args_in as needed.
3630 // mod_args and args_out parameters may return values as needed.
3631 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3632 ScopedVMInitArgs* mod_args,
3633 JavaVMInitArgs** args_out) {
3634 jint code = match_special_option_and_act(args_in, mod_args);
3635 if (code != JNI_OK) {
3636 return code;
3637 }
3638
3639 if (mod_args->is_set()) {
3640 // args_in contains -XX:VMOptionsFile and mod_args contains the
3641 // original options from args_in along with the options expanded
3642 // from the VMOptionsFile. Return a short-hand to the caller.
3643 *args_out = mod_args->get();
3644 } else {
3645 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3646 }
3647 return JNI_OK;
3648 }
3649
3650 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3651 ScopedVMInitArgs* args_out) {
3652 // Remaining part of option string
3653 const char* tail;
3654 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3655
3656 for (int index = 0; index < args->nOptions; index++) {
3657 const JavaVMOption* option = args->options + index;
3658 if (match_option(option, "-XX:Flags=", &tail)) {
3659 Arguments::set_jvm_flags_file(tail);
3660 continue;
3661 }
3662 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3663 if (vm_options_file_args.found_vm_options_file_arg()) {
3664 jio_fprintf(defaultStream::error_stream(),
3665 "The option '%s' is already specified in the options "
3666 "container '%s' so the specification of '%s' in the "
3667 "same options container is an error.\n",
3668 vm_options_file_args.vm_options_file_arg(),
3669 vm_options_file_args.container_name(),
3670 option->optionString);
3671 return JNI_EINVAL;
3672 }
3673 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3674 // If there's a VMOptionsFile, parse that
3675 jint code = insert_vm_options_file(args, tail, index,
3676 &vm_options_file_args, args_out);
3677 if (code != JNI_OK) {
3678 return code;
3679 }
3680 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3681 if (args_out->is_set()) {
3682 // The VMOptions file inserted some options so switch 'args'
3683 // to the new set of options, and continue processing which
3684 // preserves "last option wins" semantics.
3685 args = args_out->get();
3686 // The first option from the VMOptionsFile replaces the
3687 // current option. So we back track to process the
3688 // replacement option.
3689 index--;
3690 }
3691 continue;
3692 }
3693 if (match_option(option, "-XX:+PrintVMOptions")) {
3694 PrintVMOptions = true;
3695 continue;
3696 }
3697 if (match_option(option, "-XX:-PrintVMOptions")) {
3698 PrintVMOptions = false;
3699 continue;
3700 }
3701 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3702 IgnoreUnrecognizedVMOptions = true;
3703 continue;
3704 }
3705 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3706 IgnoreUnrecognizedVMOptions = false;
3707 continue;
3708 }
3709 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3710 JVMFlag::printFlags(tty, false);
3711 vm_exit(0);
3712 }
3713
3714 #ifndef PRODUCT
3715 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3716 JVMFlag::printFlags(tty, true);
3717 vm_exit(0);
3718 }
3719 #endif
3720 }
3721 return JNI_OK;
3722 }
3723
3724 static void print_options(const JavaVMInitArgs *args) {
3725 const char* tail;
3726 for (int index = 0; index < args->nOptions; index++) {
3727 const JavaVMOption *option = args->options + index;
3728 if (match_option(option, "-XX:", &tail)) {
3729 logOption(tail);
3730 }
3731 }
3732 }
3733
3734 bool Arguments::handle_deprecated_print_gc_flags() {
3735 if (PrintGC) {
3736 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3737 }
3738 if (PrintGCDetails) {
3739 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3740 }
3741
3742 if (_legacyGCLogging.lastFlag == 2) {
3743 // -Xloggc was used to specify a filename
3744 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3745
3746 LogTarget(Error, logging) target;
3747 LogStream errstream(target);
3748 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3749 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3750 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3751 }
3752 return true;
3753 }
3754
3755 static void apply_debugger_ergo() {
3756 #ifndef PRODUCT
3757 // UseDebuggerErgo is notproduct
3758 if (ReplayCompiles) {
3759 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3760 }
3761 #endif
3762
3763 #ifndef PRODUCT
3764 if (UseDebuggerErgo) {
3765 // Turn on sub-flags
3766 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3767 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3768 }
3769 #endif
3770
3771 if (UseDebuggerErgo2) {
3772 // Debugging with limited number of CPUs
3773 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3774 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3775 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3776 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3777 }
3778 }
3779
3780 // Parse entry point called from JNI_CreateJavaVM
3781
3782 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3783 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3784 JVMFlag::check_all_flag_declarations();
3785
3786 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3787 const char* hotspotrc = ".hotspotrc";
3788 bool settings_file_specified = false;
3789 bool needs_hotspotrc_warning = false;
3790 ScopedVMInitArgs initial_vm_options_args("");
3791 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3792 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3793
3794 // Pointers to current working set of containers
3795 JavaVMInitArgs* cur_cmd_args;
3796 JavaVMInitArgs* cur_vm_options_args;
3797 JavaVMInitArgs* cur_java_options_args;
3798 JavaVMInitArgs* cur_java_tool_options_args;
3799
3800 // Containers for modified/expanded options
3801 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3802 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3803 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3804 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3805
3806
3807 jint code =
3808 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3809 if (code != JNI_OK) {
3810 return code;
3811 }
3812
3813 code = parse_java_options_environment_variable(&initial_java_options_args);
3814 if (code != JNI_OK) {
3815 return code;
3816 }
3817
3818 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3819 char *vmoptions = ClassLoader::lookup_vm_options();
3820 if (vmoptions != nullptr) {
3821 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3822 FREE_C_HEAP_ARRAY(char, vmoptions);
3823 if (code != JNI_OK) {
3824 return code;
3825 }
3826 }
3827
3828 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3829 &mod_java_tool_options_args,
3830 &cur_java_tool_options_args);
3831 if (code != JNI_OK) {
3832 return code;
3833 }
3834
3835 code = expand_vm_options_as_needed(initial_cmd_args,
3836 &mod_cmd_args,
3837 &cur_cmd_args);
3838 if (code != JNI_OK) {
3839 return code;
3840 }
3841
3842 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3843 &mod_java_options_args,
3844 &cur_java_options_args);
3845 if (code != JNI_OK) {
3846 return code;
3847 }
3848
3849 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3850 &mod_vm_options_args,
3851 &cur_vm_options_args);
3852 if (code != JNI_OK) {
3853 return code;
3854 }
3855
3856 const char* flags_file = Arguments::get_jvm_flags_file();
3857 settings_file_specified = (flags_file != nullptr);
3858
3859 if (IgnoreUnrecognizedVMOptions) {
3860 cur_cmd_args->ignoreUnrecognized = true;
3861 cur_java_tool_options_args->ignoreUnrecognized = true;
3862 cur_java_options_args->ignoreUnrecognized = true;
3863 }
3864
3865 // Parse specified settings file
3866 if (settings_file_specified) {
3867 if (!process_settings_file(flags_file, true,
3868 cur_cmd_args->ignoreUnrecognized)) {
3869 return JNI_EINVAL;
3870 }
3871 } else {
3872 #ifdef ASSERT
3873 // Parse default .hotspotrc settings file
3874 if (!process_settings_file(".hotspotrc", false,
3875 cur_cmd_args->ignoreUnrecognized)) {
3876 return JNI_EINVAL;
3877 }
3878 #else
3879 struct stat buf;
3880 if (os::stat(hotspotrc, &buf) == 0) {
3881 needs_hotspotrc_warning = true;
3882 }
3883 #endif
3884 }
3885
3886 if (PrintVMOptions) {
3887 print_options(cur_java_tool_options_args);
3888 print_options(cur_cmd_args);
3889 print_options(cur_java_options_args);
3890 }
3891
3892 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3893 jint result = parse_vm_init_args(cur_vm_options_args,
3894 cur_java_tool_options_args,
3895 cur_java_options_args,
3896 cur_cmd_args);
3897
3898 if (result != JNI_OK) {
3899 return result;
3900 }
3901
3902 // Delay warning until here so that we've had a chance to process
3903 // the -XX:-PrintWarnings flag
3904 if (needs_hotspotrc_warning) {
3905 warning("%s file is present but has been ignored. "
3906 "Run with -XX:Flags=%s to load the file.",
3907 hotspotrc, hotspotrc);
3908 }
3909
3910 if (needs_module_property_warning) {
3911 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3912 " names that are reserved for internal use.");
3913 }
3914
3915 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3916 UNSUPPORTED_OPTION(UseLargePages);
3917 #endif
3918
3919 #if defined(AIX)
3920 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3921 #endif
3922
3923 #ifndef PRODUCT
3924 if (TraceBytecodesAt != 0) {
3925 TraceBytecodes = true;
3926 }
3927 if (CountCompiledCalls) {
3928 if (UseCounterDecay) {
3929 warning("UseCounterDecay disabled because CountCalls is set");
3930 UseCounterDecay = false;
3931 }
3932 }
3933 #endif // PRODUCT
3934
3935 if (ScavengeRootsInCode == 0) {
3936 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3937 warning("Forcing ScavengeRootsInCode non-zero");
3938 }
3939 ScavengeRootsInCode = 1;
3940 }
3941
3942 if (!handle_deprecated_print_gc_flags()) {
3943 return JNI_EINVAL;
3944 }
3945
3946 // Set object alignment values.
3947 set_object_alignment();
3948
3949 #if !INCLUDE_CDS
3950 if (DumpSharedSpaces || RequireSharedSpaces) {
3951 jio_fprintf(defaultStream::error_stream(),
3952 "Shared spaces are not supported in this VM\n");
3953 return JNI_ERR;
3954 }
3955 if (DumpLoadedClassList != nullptr) {
3956 jio_fprintf(defaultStream::error_stream(),
3957 "DumpLoadedClassList is not supported in this VM\n");
3958 return JNI_ERR;
3959 }
3960 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
3961 log_is_enabled(Info, cds)) {
3962 warning("Shared spaces are not supported in this VM");
3963 UseSharedSpaces = false;
3964 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3965 }
3966 no_shared_spaces("CDS Disabled");
3967 #endif // INCLUDE_CDS
3968
3969 // Verify NMT arguments
3970 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3971 if (lvl == NMT_unknown) {
3972 jio_fprintf(defaultStream::error_stream(),
3973 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", nullptr);
3974 return JNI_ERR;
3975 }
3976 if (PrintNMTStatistics && lvl == NMT_off) {
3977 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3978 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3979 }
3980
3981 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3982 if (trace_dependencies && VerifyDependencies) {
3983 warning("dependency logging results may be inflated by VerifyDependencies");
3984 }
3985
3986 apply_debugger_ergo();
3987
3988 if (log_is_enabled(Info, arguments)) {
3989 LogStream st(Log(arguments)::info());
3990 Arguments::print_on(&st);
3991 }
3992
3993 return JNI_OK;
3994 }
3995
3996 jint Arguments::apply_ergo() {
3997 // Set flags based on ergonomics.
3998 jint result = set_ergonomics_flags();
3999 if (result != JNI_OK) return result;
4000
4001 // Set heap size based on available physical memory
4002 set_heap_size();
4003
4004 GCConfig::arguments()->initialize();
4005
4006 set_shared_spaces_flags_and_archive_paths();
4007
4008 // Initialize Metaspace flags and alignments
4009 Metaspace::ergo_initialize();
4010
4011 if (!StringDedup::ergo_initialize()) {
4012 return JNI_EINVAL;
4013 }
4014
4015 // Set compiler flags after GC is selected and GC specific
4016 // flags (LoopStripMiningIter) are set.
4017 CompilerConfig::ergo_initialize();
4018
4019 // Set bytecode rewriting flags
4020 set_bytecode_flags();
4021
4022 // Set flags if aggressive optimization flags are enabled
4023 jint code = set_aggressive_opts_flags();
4024 if (code != JNI_OK) {
4025 return code;
4026 }
4027
4028 #ifdef ZERO
4029 // Clear flags not supported on zero.
4030 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4031 #endif // ZERO
4032
4033 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4034 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4035 DebugNonSafepoints = true;
4036 }
4037
4038 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4039 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4040 }
4041
4042 // Treat the odd case where local verification is enabled but remote
4043 // verification is not as if both were enabled.
4044 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4045 log_info(verification)("Turning on remote verification because local verification is on");
4046 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4047 }
4048
4049 #ifndef PRODUCT
4050 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4051 if (use_vm_log()) {
4052 LogVMOutput = true;
4053 }
4054 }
4055 #endif // PRODUCT
4056
4057 if (PrintCommandLineFlags) {
4058 JVMFlag::printSetFlags(tty);
4059 }
4060
4061 #ifdef COMPILER2
4062 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4063 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4064 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4065 }
4066 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4067
4068 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4069 if (!EnableVectorReboxing) {
4070 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4071 } else {
4072 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4073 }
4074 }
4075 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4076
4077 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
4078 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
4079 }
4080 FLAG_SET_DEFAULT(UseVectorStubs, false);
4081 }
4082 #endif // COMPILER2
4083
4084 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4085 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4086 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4087 }
4088 }
4089 return JNI_OK;
4090 }
4091
4092 jint Arguments::adjust_after_os() {
4093 if (UseNUMA) {
4094 if (UseParallelGC) {
4095 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4096 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4097 }
4098 }
4099 }
4100 return JNI_OK;
4101 }
4102
4103 int Arguments::PropertyList_count(SystemProperty* pl) {
4104 int count = 0;
4105 while(pl != nullptr) {
4106 count++;
4107 pl = pl->next();
4108 }
4109 return count;
4110 }
4111
4112 // Return the number of readable properties.
4113 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4114 int count = 0;
4115 while(pl != nullptr) {
4116 if (pl->readable()) {
4117 count++;
4118 }
4119 pl = pl->next();
4120 }
4121 return count;
4122 }
4123
4124 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4125 assert(key != nullptr, "just checking");
4126 SystemProperty* prop;
4127 for (prop = pl; prop != nullptr; prop = prop->next()) {
4128 if (strcmp(key, prop->key()) == 0) return prop->value();
4129 }
4130 return nullptr;
4131 }
4132
4133 // Return the value of the requested property provided that it is a readable property.
4134 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4135 assert(key != nullptr, "just checking");
4136 SystemProperty* prop;
4137 // Return the property value if the keys match and the property is not internal or
4138 // it's the special internal property "jdk.boot.class.path.append".
4139 for (prop = pl; prop != nullptr; prop = prop->next()) {
4140 if (strcmp(key, prop->key()) == 0) {
4141 if (!prop->internal()) {
4142 return prop->value();
4143 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4144 return prop->value();
4145 } else {
4146 // Property is internal and not jdk.boot.class.path.append so return null.
4147 return nullptr;
4148 }
4149 }
4150 }
4151 return nullptr;
4152 }
4153
4154 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4155 SystemProperty* p = *plist;
4156 if (p == nullptr) {
4157 *plist = new_p;
4158 } else {
4159 while (p->next() != nullptr) {
4160 p = p->next();
4161 }
4162 p->set_next(new_p);
4163 }
4164 }
4165
4166 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4167 bool writeable, bool internal) {
4168 if (plist == nullptr)
4169 return;
4170
4171 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4172 PropertyList_add(plist, new_p);
4173 }
4174
4175 void Arguments::PropertyList_add(SystemProperty *element) {
4176 PropertyList_add(&_system_properties, element);
4177 }
4178
4179 // This add maintains unique property key in the list.
4180 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4181 PropertyAppendable append, PropertyWriteable writeable,
4182 PropertyInternal internal) {
4183 if (plist == nullptr)
4184 return;
4185
4186 // If property key exists and is writeable, then update with new value.
4187 // Trying to update a non-writeable property is silently ignored.
4188 SystemProperty* prop;
4189 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4190 if (strcmp(k, prop->key()) == 0) {
4191 if (append == AppendProperty) {
4192 prop->append_writeable_value(v);
4193 } else {
4194 prop->set_writeable_value(v);
4195 }
4196 return;
4197 }
4198 }
4199
4200 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4201 }
4202
4203 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4204 // Returns true if all of the source pointed by src has been copied over to
4205 // the destination buffer pointed by buf. Otherwise, returns false.
4206 // Notes:
4207 // 1. If the length (buflen) of the destination buffer excluding the
4208 // null terminator character is not long enough for holding the expanded
4209 // pid characters, it also returns false instead of returning the partially
4210 // expanded one.
4211 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4212 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4213 char* buf, size_t buflen) {
4214 const char* p = src;
4215 char* b = buf;
4216 const char* src_end = &src[srclen];
4217 char* buf_end = &buf[buflen - 1];
4218
4219 while (p < src_end && b < buf_end) {
4220 if (*p == '%') {
4221 switch (*(++p)) {
4222 case '%': // "%%" ==> "%"
4223 *b++ = *p++;
4224 break;
4225 case 'p': { // "%p" ==> current process id
4226 // buf_end points to the character before the last character so
4227 // that we could write '\0' to the end of the buffer.
4228 size_t buf_sz = buf_end - b + 1;
4229 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4230
4231 // if jio_snprintf fails or the buffer is not long enough to hold
4232 // the expanded pid, returns false.
4233 if (ret < 0 || ret >= (int)buf_sz) {
4234 return false;
4235 } else {
4236 b += ret;
4237 assert(*b == '\0', "fail in copy_expand_pid");
4238 if (p == src_end && b == buf_end + 1) {
4239 // reach the end of the buffer.
4240 return true;
4241 }
4242 }
4243 p++;
4244 break;
4245 }
4246 default :
4247 *b++ = '%';
4248 }
4249 } else {
4250 *b++ = *p++;
4251 }
4252 }
4253 *b = '\0';
4254 return (p == src_end); // return false if not all of the source was copied
4255 }