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