1 /*
2 * Copyright (c) 1997, 2024, 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/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "cds/heapShared.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/javaAssertions.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/stringTable.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "compiler/compilerDefinitions.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 char* Arguments::_java_command = nullptr;
89 SystemProperty* Arguments::_system_properties = nullptr;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 const char* Arguments::_java_vendor_url_bug = nullptr;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
102
103 bool Arguments::_enable_preview = false;
104
105 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
106
107 // These are not set by the JDK's built-in launchers, but they can be set by
108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
109 // JavaVMOption in jni.h.
110 abort_hook_t Arguments::_abort_hook = nullptr;
111 exit_hook_t Arguments::_exit_hook = nullptr;
112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
116 SystemProperty *Arguments::_java_library_path = nullptr;
117 SystemProperty *Arguments::_java_home = nullptr;
118 SystemProperty *Arguments::_java_class_path = nullptr;
119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
120 SystemProperty *Arguments::_vm_info = nullptr;
121
122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
123 PathString *Arguments::_boot_class_path = nullptr;
124 bool Arguments::_has_jimage = false;
125
126 char* Arguments::_ext_dirs = nullptr;
127
128 // True if -Xshare:auto option was specified.
129 static bool xshare_auto_cmd_line = false;
130
131 // True if -Xint/-Xmixed/-Xcomp were specified
132 static bool mode_flag_cmd_line = false;
133
134 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
135 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
136 if (new_value == nullptr) {
137 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
138 return false;
139 }
140 if (_value != nullptr) {
141 FreeHeap(_value);
142 }
143 _value = new_value;
144 strcpy(_value, value);
145 return true;
146 }
147
148 void PathString::append_value(const char *value) {
149 char *sp;
150 size_t len = 0;
151 if (value != nullptr) {
152 len = strlen(value);
153 if (_value != nullptr) {
154 len += strlen(_value);
155 }
156 sp = AllocateHeap(len+2, mtArguments);
157 assert(sp != nullptr, "Unable to allocate space for new append path value");
158 if (sp != nullptr) {
159 if (_value != nullptr) {
160 strcpy(sp, _value);
161 strcat(sp, os::path_separator());
162 strcat(sp, value);
163 FreeHeap(_value);
164 } else {
165 strcpy(sp, value);
166 }
167 _value = sp;
168 }
169 }
170 }
171
172 PathString::PathString(const char* value) {
173 if (value == nullptr) {
174 _value = nullptr;
175 } else {
176 _value = AllocateHeap(strlen(value)+1, mtArguments);
177 strcpy(_value, value);
178 }
179 }
180
181 PathString::~PathString() {
182 if (_value != nullptr) {
183 FreeHeap(_value);
184 _value = nullptr;
185 }
186 }
187
188 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
189 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
190 size_t len = strlen(module_name) + 1;
191 _module_name = AllocateHeap(len, mtInternal);
192 strncpy(_module_name, module_name, len); // copy the trailing null
193 _path = new PathString(path);
194 }
195
196 ModulePatchPath::~ModulePatchPath() {
197 if (_module_name != nullptr) {
198 FreeHeap(_module_name);
199 _module_name = nullptr;
200 }
201 if (_path != nullptr) {
202 delete _path;
203 _path = nullptr;
204 }
205 }
206
207 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
208 if (key == nullptr) {
209 _key = nullptr;
210 } else {
211 _key = AllocateHeap(strlen(key)+1, mtArguments);
212 strcpy(_key, key);
213 }
214 _next = nullptr;
215 _internal = internal;
216 _writeable = writeable;
217 }
218
219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
220 // part of the option string.
221 static bool match_option(const JavaVMOption *option, const char* name,
222 const char** tail) {
223 size_t len = strlen(name);
224 if (strncmp(option->optionString, name, len) == 0) {
225 *tail = option->optionString + len;
226 return true;
227 } else {
228 return false;
229 }
230 }
231
232 // Check if 'option' matches 'name'. No "tail" is allowed.
233 static bool match_option(const JavaVMOption *option, const char* name) {
234 const char* tail = nullptr;
235 bool result = match_option(option, name, &tail);
236 if (tail != nullptr && *tail == '\0') {
237 return result;
238 } else {
239 return false;
240 }
241 }
242
243 // Return true if any of the strings in null-terminated array 'names' matches.
244 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
245 // the option must match exactly.
246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
247 bool tail_allowed) {
248 for (/* empty */; *names != nullptr; ++names) {
249 if (match_option(option, *names, tail)) {
250 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
251 return true;
252 }
253 }
254 }
255 return false;
256 }
257
258 #if INCLUDE_JFR
259 static bool _has_jfr_option = false; // is using JFR
260
261 // return true on failure
262 static bool match_jfr_option(const JavaVMOption** option) {
263 assert((*option)->optionString != nullptr, "invariant");
264 char* tail = nullptr;
265 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
266 _has_jfr_option = true;
267 return Jfr::on_start_flight_recording_option(option, tail);
268 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_flight_recorder_option(option, tail);
271 }
272 return false;
273 }
274
275 bool Arguments::has_jfr_option() {
276 return _has_jfr_option;
277 }
278 #endif
279
280 static void logOption(const char* opt) {
281 if (PrintVMOptions) {
282 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
283 }
284 }
285
286 bool needs_module_property_warning = false;
287
288 #define MODULE_PROPERTY_PREFIX "jdk.module."
289 #define MODULE_PROPERTY_PREFIX_LEN 11
290 #define ADDEXPORTS "addexports"
291 #define ADDEXPORTS_LEN 10
292 #define ADDREADS "addreads"
293 #define ADDREADS_LEN 8
294 #define ADDOPENS "addopens"
295 #define ADDOPENS_LEN 8
296 #define PATCH "patch"
297 #define PATCH_LEN 5
298 #define ADDMODS "addmods"
299 #define ADDMODS_LEN 7
300 #define LIMITMODS "limitmods"
301 #define LIMITMODS_LEN 9
302 #define PATH "path"
303 #define PATH_LEN 4
304 #define UPGRADE_PATH "upgrade.path"
305 #define UPGRADE_PATH_LEN 12
306 #define ENABLE_NATIVE_ACCESS "enable.native.access"
307 #define ENABLE_NATIVE_ACCESS_LEN 20
308
309 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
310 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
311 return ((strncmp(option, property, len) == 0) &&
312 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
313 }
314
315 // Return true if property starts with "jdk.module." and its ensuing chars match
316 // any of the reserved module properties.
317 // property should be passed without the leading "-D".
318 bool Arguments::is_internal_module_property(const char* property) {
319 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
320 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
321 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
322 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
323 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
324 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
325 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
326 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
327 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
328 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
329 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
330 return true;
331 }
332 }
333 return false;
334 }
335
336 // Process java launcher properties.
337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
338 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
339 // Must do this before setting up other system properties,
340 // as some of them may depend on launcher type.
341 for (int index = 0; index < args->nOptions; index++) {
342 const JavaVMOption* option = args->options + index;
343 const char* tail;
344
345 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
346 process_java_launcher_argument(tail, option->extraInfo);
347 continue;
348 }
349 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
350 if (strcmp(tail, "true") == 0) {
351 _sun_java_launcher_is_altjvm = true;
352 }
353 continue;
354 }
355 }
356 }
357
358 // Initialize system properties key and value.
359 void Arguments::init_system_properties() {
360
361 // Set up _boot_class_path which is not a property but
362 // relies heavily on argument processing and the jdk.boot.class.path.append
363 // property. It is used to store the underlying boot class path.
364 _boot_class_path = new PathString(nullptr);
365
366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
367 "Java Virtual Machine Specification", false));
368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
370 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
371
372 // Initialize the vm.info now, but it will need updating after argument parsing.
373 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
374
375 // Following are JVMTI agent writable properties.
376 // Properties values are set to nullptr and they are
377 // os specific they are initialized in os::init_system_properties_values().
378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
379 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
380 _java_home = new SystemProperty("java.home", nullptr, true);
381 _java_class_path = new SystemProperty("java.class.path", "", true);
382 // jdk.boot.class.path.append is a non-writeable, internal property.
383 // It can only be set by either:
384 // - -Xbootclasspath/a:
385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
387
388 // Add to System Property list.
389 PropertyList_add(&_system_properties, _sun_boot_library_path);
390 PropertyList_add(&_system_properties, _java_library_path);
391 PropertyList_add(&_system_properties, _java_home);
392 PropertyList_add(&_system_properties, _java_class_path);
393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
394 PropertyList_add(&_system_properties, _vm_info);
395
396 // Set OS specific system properties values
397 os::init_system_properties_values();
398 }
399
400 // Update/Initialize System properties after JDK version number is known
401 void Arguments::init_version_specific_system_properties() {
402 enum { bufsz = 16 };
403 char buffer[bufsz];
404 const char* spec_vendor = "Oracle Corporation";
405 uint32_t spec_version = JDK_Version::current().major_version();
406
407 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
408
409 PropertyList_add(&_system_properties,
410 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
411 PropertyList_add(&_system_properties,
412 new SystemProperty("java.vm.specification.version", buffer, false));
413 PropertyList_add(&_system_properties,
414 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
415 }
416
417 /*
418 * -XX argument processing:
419 *
420 * -XX arguments are defined in several places, such as:
421 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
422 * -XX arguments are parsed in parse_argument().
423 * -XX argument bounds checking is done in check_vm_args_consistency().
424 *
425 * Over time -XX arguments may change. There are mechanisms to handle common cases:
426 *
427 * ALIASED: An option that is simply another name for another option. This is often
428 * part of the process of deprecating a flag, but not all aliases need
429 * to be deprecated.
430 *
431 * Create an alias for an option by adding the old and new option names to the
432 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
433 *
434 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
435 * support may be removed in the future. Both regular and aliased options may be
436 * deprecated.
437 *
438 * Add a deprecation warning for an option (or alias) by adding an entry in the
439 * "special_jvm_flags" table and setting the "deprecated_in" field.
440 * Often an option "deprecated" in one major release will
441 * be made "obsolete" in the next. In this case the entry should also have its
442 * "obsolete_in" field set.
443 *
444 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
445 * on the command line. A warning is printed to let the user know that option might not
446 * be accepted in the future.
447 *
448 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
449 * table and setting the "obsolete_in" field.
450 *
451 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
452 * to the current JDK version. The system will flatly refuse to admit the existence of
453 * the flag. This allows a flag to die automatically over JDK releases.
454 *
455 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
456 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
457 * - Newly obsolete or expired deprecated options should have their global variable
458 * definitions removed (from globals.hpp, etc) and related implementations removed.
459 *
460 * Recommended approach for removing options:
461 *
462 * To remove options commonly used by customers (e.g. product -XX options), use
463 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
464 *
465 * To remove internal options (e.g. diagnostic, experimental, develop options), use
466 * a 2-step model adding major release numbers to the obsolete and expire columns.
467 *
468 * To change the name of an option, use the alias table as well as a 2-step
469 * model adding major release numbers to the deprecate and expire columns.
470 * Think twice about aliasing commonly used customer options.
471 *
472 * There are times when it is appropriate to leave a future release number as undefined.
473 *
474 * Tests: Aliases should be tested in VMAliasOptions.java.
475 * Deprecated options should be tested in VMDeprecatedOptions.java.
476 */
477
478 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
479 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
480 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
481 // the command-line as usual, but will issue a warning.
482 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
483 // the command-line, while issuing a warning and ignoring the flag value.
484 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
485 // existence of the flag.
486 //
487 // MANUAL CLEANUP ON JDK VERSION UPDATES:
488 // This table ensures that the handling of options will update automatically when the JDK
489 // version is incremented, but the source code needs to be cleanup up manually:
490 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
491 // variable should be removed, as well as users of the variable.
492 // - As "deprecated" options age into "obsolete" options, move the entry into the
493 // "Obsolete Flags" section of the table.
494 // - All expired options should be removed from the table.
495 static SpecialFlag const special_jvm_flags[] = {
496 // -------------- Deprecated Flags --------------
497 // --- Non-alias flags - sorted by obsolete_in then expired_in:
498 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() },
501 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
502 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
503 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
504 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
505 { "RegisterFinalizersAtInit", JDK_Version::jdk(22), JDK_Version::jdk(23), JDK_Version::jdk(24) },
506 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
507 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
508 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
509 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
510 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
511 #if defined(X86)
512 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
513 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
514 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
515 #endif // X86
516 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
517 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
518
519 // -------------- Obsolete Flags - sorted by expired_in --------------
520
521 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
522
523 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
524 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
525 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
526 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
527 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
528 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
529
530 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
531 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
532 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
533
534 { "AdaptiveSizePolicyCollectionCostMargin", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
535 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) },
536 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
537 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
538 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
539 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) },
540 { "TLABStats", JDK_Version::jdk(12), JDK_Version::jdk(23), JDK_Version::jdk(24) },
541 { "GCLockerEdenExpansionPercent", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
542 { "NUMAPageScanRate", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
543 { "ProcessDistributionStride", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
544
545 { "ParallelOldDeadWoodLimiterMean", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
546 { "ParallelOldDeadWoodLimiterStdDev", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
547 { "UseNeon", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
548 { "ScavengeBeforeFullGC", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
549 #ifdef ASSERT
550 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
551 #endif
552
553 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
554 // These entries will generate build errors. Their purpose is to test the macros.
555 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
556 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
557 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
558 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
559 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
560 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
562 #endif
563
564 { nullptr, JDK_Version(0), JDK_Version(0) }
565 };
566
567 // Flags that are aliases for other flags.
568 typedef struct {
569 const char* alias_name;
570 const char* real_name;
571 } AliasedFlag;
572
573 static AliasedFlag const aliased_jvm_flags[] = {
574 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
575 { nullptr, nullptr}
576 };
577
578 // Return true if "v" is less than "other", where "other" may be "undefined".
579 static bool version_less_than(JDK_Version v, JDK_Version other) {
580 assert(!v.is_undefined(), "must be defined");
581 if (!other.is_undefined() && v.compare(other) >= 0) {
582 return false;
583 } else {
584 return true;
585 }
586 }
587
588 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
589 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
590 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
591 flag = special_jvm_flags[i];
592 return true;
593 }
594 }
595 return false;
596 }
597
598 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
599 assert(version != nullptr, "Must provide a version buffer");
600 SpecialFlag flag;
601 if (lookup_special_flag(flag_name, flag)) {
602 if (!flag.obsolete_in.is_undefined()) {
603 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
604 *version = flag.obsolete_in;
605 // This flag may have been marked for obsoletion in this version, but we may not
606 // have actually removed it yet. Rather than ignoring it as soon as we reach
607 // this version we allow some time for the removal to happen. So if the flag
608 // still actually exists we process it as normal, but issue an adjusted warning.
609 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
610 if (real_flag != nullptr) {
611 char version_str[256];
612 version->to_string(version_str, sizeof(version_str));
613 warning("Temporarily processing option %s; support is scheduled for removal in %s",
614 flag_name, version_str);
615 return false;
616 }
617 return true;
618 }
619 }
620 }
621 return false;
622 }
623
624 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
625 assert(version != nullptr, "Must provide a version buffer");
626 SpecialFlag flag;
627 if (lookup_special_flag(flag_name, flag)) {
628 if (!flag.deprecated_in.is_undefined()) {
629 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
630 version_less_than(JDK_Version::current(), flag.expired_in)) {
631 *version = flag.deprecated_in;
632 return 1;
633 } else {
634 return -1;
635 }
636 }
637 }
638 return 0;
639 }
640
641 const char* Arguments::real_flag_name(const char *flag_name) {
642 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
643 const AliasedFlag& flag_status = aliased_jvm_flags[i];
644 if (strcmp(flag_status.alias_name, flag_name) == 0) {
645 return flag_status.real_name;
646 }
647 }
648 return flag_name;
649 }
650
651 #ifdef ASSERT
652 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
653 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
654 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
655 return true;
656 }
657 }
658 return false;
659 }
660
661 // Verifies the correctness of the entries in the special_jvm_flags table.
662 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
663 // version being earlier than the deprecation version, then a warning is issued
664 // and verification fails - by returning false. If it is detected that the table
665 // is out of date, with respect to the current version, then ideally a warning is
666 // issued but verification does not fail. This allows the VM to operate when the
667 // version is first updated, without needing to update all the impacted flags at
668 // the same time. In practice we can't issue the warning immediately when the version
669 // is updated as it occurs for every test and some tests are not prepared to handle
670 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
671 // if the check_globals flag is true, and in addition allow a grace period and only
672 // check for stale flags when we hit build 25 (which is far enough into the 6 month
673 // release cycle that all flag updates should have been processed, whilst still
674 // leaving time to make the change before RDP2).
675 // We use a gtest to call this, passing true, so that we can detect stale flags before
676 // the end of the release cycle.
677
678 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
679
680 bool Arguments::verify_special_jvm_flags(bool check_globals) {
681 bool success = true;
682 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
683 const SpecialFlag& flag = special_jvm_flags[i];
684 if (lookup_special_flag(flag.name, i)) {
685 warning("Duplicate special flag declaration \"%s\"", flag.name);
686 success = false;
687 }
688 if (flag.deprecated_in.is_undefined() &&
689 flag.obsolete_in.is_undefined()) {
690 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
691 success = false;
692 }
693
694 if (!flag.deprecated_in.is_undefined()) {
695 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
696 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
697 success = false;
698 }
699
700 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
701 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
702 success = false;
703 }
704 }
705
706 if (!flag.obsolete_in.is_undefined()) {
707 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
708 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
709 success = false;
710 }
711
712 // if flag has become obsolete it should not have a "globals" flag defined anymore.
713 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
714 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
715 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
716 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
717 success = false;
718 }
719 }
720
721 } else if (!flag.expired_in.is_undefined()) {
722 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
723 success = false;
724 }
725
726 if (!flag.expired_in.is_undefined()) {
727 // if flag has become expired it should not have a "globals" flag defined anymore.
728 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
729 !version_less_than(JDK_Version::current(), flag.expired_in)) {
730 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
731 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
732 success = false;
733 }
734 }
735 }
736 }
737 return success;
738 }
739 #endif
740
741 bool Arguments::atojulong(const char *s, julong* result) {
742 return parse_integer(s, result);
743 }
744
745 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
746 if (size < min_size) return arg_too_small;
747 if (size > max_size) return arg_too_big;
748 return arg_in_range;
749 }
750
751 // Describe an argument out of range error
752 void Arguments::describe_range_error(ArgsRange errcode) {
753 switch(errcode) {
754 case arg_too_big:
755 jio_fprintf(defaultStream::error_stream(),
756 "The specified size exceeds the maximum "
757 "representable size.\n");
758 break;
759 case arg_too_small:
760 case arg_unreadable:
761 case arg_in_range:
762 // do nothing for now
763 break;
764 default:
765 ShouldNotReachHere();
766 }
767 }
768
769 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
770 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
771 return true;
772 } else {
773 return false;
774 }
775 }
776
777 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
778 // strtod allows leading whitespace, but our flag format does not.
779 if (*value == '\0' || isspace(*value)) {
780 return false;
781 }
782 char* end;
783 errno = 0;
784 double v = strtod(value, &end);
785 if ((errno != 0) || (*end != 0)) {
786 return false;
787 }
788 if (g_isnan(v) || !g_isfinite(v)) {
789 // Currently we cannot handle these special values.
790 return false;
791 }
792
793 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
794 return true;
795 }
796 return false;
797 }
798
799 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
800 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
801
802 if (flag->is_int()) {
803 int v;
804 if (parse_integer(value, &v)) {
805 result = JVMFlagAccess::set_int(flag, &v, origin);
806 }
807 } else if (flag->is_uint()) {
808 uint v;
809 if (parse_integer(value, &v)) {
810 result = JVMFlagAccess::set_uint(flag, &v, origin);
811 }
812 } else if (flag->is_intx()) {
813 intx v;
814 if (parse_integer(value, &v)) {
815 result = JVMFlagAccess::set_intx(flag, &v, origin);
816 }
817 } else if (flag->is_uintx()) {
818 uintx v;
819 if (parse_integer(value, &v)) {
820 result = JVMFlagAccess::set_uintx(flag, &v, origin);
821 }
822 } else if (flag->is_uint64_t()) {
823 uint64_t v;
824 if (parse_integer(value, &v)) {
825 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
826 }
827 } else if (flag->is_size_t()) {
828 size_t v;
829 if (parse_integer(value, &v)) {
830 result = JVMFlagAccess::set_size_t(flag, &v, origin);
831 }
832 }
833
834 return result == JVMFlag::SUCCESS;
835 }
836
837 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
838 if (value[0] == '\0') {
839 value = nullptr;
840 }
841 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
842 // Contract: JVMFlag always returns a pointer that needs freeing.
843 FREE_C_HEAP_ARRAY(char, value);
844 return true;
845 }
846
847 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
848 const char* old_value = "";
849 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
850 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
851 size_t new_len = strlen(new_value);
852 const char* value;
853 char* free_this_too = nullptr;
854 if (old_len == 0) {
855 value = new_value;
856 } else if (new_len == 0) {
857 value = old_value;
858 } else {
859 size_t length = old_len + 1 + new_len + 1;
860 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
861 // each new setting adds another LINE to the switch:
862 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
863 value = buf;
864 free_this_too = buf;
865 }
866 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
867 // JVMFlag always returns a pointer that needs freeing.
868 FREE_C_HEAP_ARRAY(char, value);
869 // JVMFlag made its own copy, so I must delete my own temp. buffer.
870 FREE_C_HEAP_ARRAY(char, free_this_too);
871 return true;
872 }
873
874 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
875 const char* real_name = real_flag_name(arg);
876 JDK_Version since = JDK_Version();
877 switch (is_deprecated_flag(arg, &since)) {
878 case -1: {
879 // Obsolete or expired, so don't process normally,
880 // but allow for an obsolete flag we're still
881 // temporarily allowing.
882 if (!is_obsolete_flag(arg, &since)) {
883 return real_name;
884 }
885 // Note if we're not considered obsolete then we can't be expired either
886 // as obsoletion must come first.
887 return nullptr;
888 }
889 case 0:
890 return real_name;
891 case 1: {
892 char version[256];
893 since.to_string(version, sizeof(version));
894 if (real_name != arg) {
895 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
896 arg, version, real_name);
897 } else {
898 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
899 arg, version);
900 }
901 return real_name;
902 }
903 }
904 ShouldNotReachHere();
905 return nullptr;
906 }
907
908 #define BUFLEN 255
909
910 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
911 char name_copied[BUFLEN+1];
912 if (name[name_length] != 0) {
913 if (name_length > BUFLEN) {
914 return nullptr;
915 } else {
916 strncpy(name_copied, name, name_length);
917 name_copied[name_length] = '\0';
918 name = name_copied;
919 }
920 }
921
922 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
923 if (real_name == nullptr) {
924 return nullptr;
925 }
926 JVMFlag* flag = JVMFlag::find_flag(real_name);
927 return flag;
928 }
929
930 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
931 bool is_bool = false;
932 bool bool_val = false;
933 char c = *arg;
934 if (c == '+' || c == '-') {
935 is_bool = true;
936 bool_val = (c == '+');
937 arg++;
938 }
939
940 const char* name = arg;
941 while (true) {
942 c = *arg;
943 if (isalnum(c) || (c == '_')) {
944 ++arg;
945 } else {
946 break;
947 }
948 }
949
950 size_t name_len = size_t(arg - name);
951 if (name_len == 0) {
952 return false;
953 }
954
955 JVMFlag* flag = find_jvm_flag(name, name_len);
956 if (flag == nullptr) {
957 return false;
958 }
959
960 if (is_bool) {
961 if (*arg != 0) {
962 // Error -- extra characters such as -XX:+BoolFlag=123
963 return false;
964 }
965 return set_bool_flag(flag, bool_val, origin);
966 }
967
968 if (arg[0] == '=') {
969 const char* value = arg + 1;
970 if (flag->is_ccstr()) {
971 if (flag->ccstr_accumulates()) {
972 return append_to_string_flag(flag, value, origin);
973 } else {
974 return set_string_flag(flag, value, origin);
975 }
976 } else if (flag->is_double()) {
977 return set_fp_numeric_flag(flag, value, origin);
978 } else {
979 return set_numeric_flag(flag, value, origin);
980 }
981 }
982
983 if (arg[0] == ':' && arg[1] == '=') {
984 // -XX:Foo:=xxx will reset the string flag to the given value.
985 const char* value = arg + 2;
986 return set_string_flag(flag, value, origin);
987 }
988
989 return false;
990 }
991
992 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
993 assert(bldarray != nullptr, "illegal argument");
994
995 if (arg == nullptr) {
996 return;
997 }
998
999 int new_count = *count + 1;
1000
1001 // expand the array and add arg to the last element
1002 if (*bldarray == nullptr) {
1003 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1004 } else {
1005 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1006 }
1007 (*bldarray)[*count] = os::strdup_check_oom(arg);
1008 *count = new_count;
1009 }
1010
1011 void Arguments::build_jvm_args(const char* arg) {
1012 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1013 }
1014
1015 void Arguments::build_jvm_flags(const char* arg) {
1016 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1017 }
1018
1019 // utility function to return a string that concatenates all
1020 // strings in a given char** array
1021 const char* Arguments::build_resource_string(char** args, int count) {
1022 if (args == nullptr || count == 0) {
1023 return nullptr;
1024 }
1025 size_t length = 0;
1026 for (int i = 0; i < count; i++) {
1027 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1028 }
1029 char* s = NEW_RESOURCE_ARRAY(char, length);
1030 char* dst = s;
1031 for (int j = 0; j < count; j++) {
1032 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1033 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1034 dst += offset;
1035 length -= offset;
1036 }
1037 return (const char*) s;
1038 }
1039
1040 void Arguments::print_on(outputStream* st) {
1041 st->print_cr("VM Arguments:");
1042 if (num_jvm_flags() > 0) {
1043 st->print("jvm_flags: "); print_jvm_flags_on(st);
1044 st->cr();
1045 }
1046 if (num_jvm_args() > 0) {
1047 st->print("jvm_args: "); print_jvm_args_on(st);
1048 st->cr();
1049 }
1050 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1051 if (_java_class_path != nullptr) {
1052 char* path = _java_class_path->value();
1053 size_t len = strlen(path);
1054 st->print("java_class_path (initial): ");
1055 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1056 if (len == 0) {
1057 st->print_raw_cr("<not set>");
1058 } else {
1059 st->print_raw_cr(path, len);
1060 }
1061 }
1062 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1063 }
1064
1065 void Arguments::print_summary_on(outputStream* st) {
1066 // Print the command line. Environment variables that are helpful for
1067 // reproducing the problem are written later in the hs_err file.
1068 // flags are from setting file
1069 if (num_jvm_flags() > 0) {
1070 st->print_raw("Settings File: ");
1071 print_jvm_flags_on(st);
1072 st->cr();
1073 }
1074 // args are the command line and environment variable arguments.
1075 st->print_raw("Command Line: ");
1076 if (num_jvm_args() > 0) {
1077 print_jvm_args_on(st);
1078 }
1079 // this is the classfile and any arguments to the java program
1080 if (java_command() != nullptr) {
1081 st->print("%s", java_command());
1082 }
1083 st->cr();
1084 }
1085
1086 void Arguments::print_jvm_flags_on(outputStream* st) {
1087 if (_num_jvm_flags > 0) {
1088 for (int i=0; i < _num_jvm_flags; i++) {
1089 st->print("%s ", _jvm_flags_array[i]);
1090 }
1091 }
1092 }
1093
1094 void Arguments::print_jvm_args_on(outputStream* st) {
1095 if (_num_jvm_args > 0) {
1096 for (int i=0; i < _num_jvm_args; i++) {
1097 st->print("%s ", _jvm_args_array[i]);
1098 }
1099 }
1100 }
1101
1102 bool Arguments::process_argument(const char* arg,
1103 jboolean ignore_unrecognized,
1104 JVMFlagOrigin origin) {
1105 JDK_Version since = JDK_Version();
1106
1107 if (parse_argument(arg, origin)) {
1108 return true;
1109 }
1110
1111 // Determine if the flag has '+', '-', or '=' characters.
1112 bool has_plus_minus = (*arg == '+' || *arg == '-');
1113 const char* const argname = has_plus_minus ? arg + 1 : arg;
1114
1115 size_t arg_len;
1116 const char* equal_sign = strchr(argname, '=');
1117 if (equal_sign == nullptr) {
1118 arg_len = strlen(argname);
1119 } else {
1120 arg_len = equal_sign - argname;
1121 }
1122
1123 // Only make the obsolete check for valid arguments.
1124 if (arg_len <= BUFLEN) {
1125 // Construct a string which consists only of the argument name without '+', '-', or '='.
1126 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1127 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1128 if (is_obsolete_flag(stripped_argname, &since)) {
1129 char version[256];
1130 since.to_string(version, sizeof(version));
1131 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1132 return true;
1133 }
1134 }
1135
1136 // For locked flags, report a custom error message if available.
1137 // Otherwise, report the standard unrecognized VM option.
1138 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1139 if (found_flag != nullptr) {
1140 char locked_message_buf[BUFLEN];
1141 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1142 if (strlen(locked_message_buf) != 0) {
1143 #ifdef PRODUCT
1144 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1145 if (ignore_unrecognized && mismatched) {
1146 return true;
1147 }
1148 #endif
1149 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1150 }
1151 if (found_flag->is_bool() && !has_plus_minus) {
1152 jio_fprintf(defaultStream::error_stream(),
1153 "Missing +/- setting for VM option '%s'\n", argname);
1154 } else if (!found_flag->is_bool() && has_plus_minus) {
1155 jio_fprintf(defaultStream::error_stream(),
1156 "Unexpected +/- setting in VM option '%s'\n", argname);
1157 } else {
1158 jio_fprintf(defaultStream::error_stream(),
1159 "Improperly specified VM option '%s'\n", argname);
1160 }
1161 } else {
1162 if (ignore_unrecognized) {
1163 return true;
1164 }
1165 jio_fprintf(defaultStream::error_stream(),
1166 "Unrecognized VM option '%s'\n", argname);
1167 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1168 if (fuzzy_matched != nullptr) {
1169 jio_fprintf(defaultStream::error_stream(),
1170 "Did you mean '%s%s%s'?\n",
1171 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1172 fuzzy_matched->name(),
1173 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1174 }
1175 }
1176
1177 // allow for commandline "commenting out" options like -XX:#+Verbose
1178 return arg[0] == '#';
1179 }
1180
1181 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1182 FILE* stream = os::fopen(file_name, "rb");
1183 if (stream == nullptr) {
1184 if (should_exist) {
1185 jio_fprintf(defaultStream::error_stream(),
1186 "Could not open settings file %s\n", file_name);
1187 return false;
1188 } else {
1189 return true;
1190 }
1191 }
1192
1193 char token[1024];
1194 int pos = 0;
1195
1196 bool in_white_space = true;
1197 bool in_comment = false;
1198 bool in_quote = false;
1199 int quote_c = 0;
1200 bool result = true;
1201
1202 int c = getc(stream);
1203 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1204 if (in_white_space) {
1205 if (in_comment) {
1206 if (c == '\n') in_comment = false;
1207 } else {
1208 if (c == '#') in_comment = true;
1209 else if (!isspace(c)) {
1210 in_white_space = false;
1211 token[pos++] = checked_cast<char>(c);
1212 }
1213 }
1214 } else {
1215 if (c == '\n' || (!in_quote && isspace(c))) {
1216 // token ends at newline, or at unquoted whitespace
1217 // this allows a way to include spaces in string-valued options
1218 token[pos] = '\0';
1219 logOption(token);
1220 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1221 build_jvm_flags(token);
1222 pos = 0;
1223 in_white_space = true;
1224 in_quote = false;
1225 } else if (!in_quote && (c == '\'' || c == '"')) {
1226 in_quote = true;
1227 quote_c = c;
1228 } else if (in_quote && (c == quote_c)) {
1229 in_quote = false;
1230 } else {
1231 token[pos++] = checked_cast<char>(c);
1232 }
1233 }
1234 c = getc(stream);
1235 }
1236 if (pos > 0) {
1237 token[pos] = '\0';
1238 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1239 build_jvm_flags(token);
1240 }
1241 fclose(stream);
1242 return result;
1243 }
1244
1245 //=============================================================================================================
1246 // Parsing of properties (-D)
1247
1248 const char* Arguments::get_property(const char* key) {
1249 return PropertyList_get_value(system_properties(), key);
1250 }
1251
1252 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1253 const char* eq = strchr(prop, '=');
1254 const char* key;
1255 const char* value = "";
1256
1257 if (eq == nullptr) {
1258 // property doesn't have a value, thus use passed string
1259 key = prop;
1260 } else {
1261 // property have a value, thus extract it and save to the
1262 // allocated string
1263 size_t key_len = eq - prop;
1264 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1265
1266 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1267 key = tmp_key;
1268
1269 value = &prop[key_len + 1];
1270 }
1271
1272 if (internal == ExternalProperty) {
1273 CDSConfig::check_incompatible_property(key, value);
1274 }
1275
1276 if (strcmp(key, "java.compiler") == 0) {
1277 // we no longer support java.compiler system property, log a warning and let it get
1278 // passed to Java, like any other system property
1279 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1280 // for applications using NONE or empty value, log a more informative message
1281 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1282 } else {
1283 warning("The java.compiler system property is obsolete and no longer supported.");
1284 }
1285 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1286 // sun.java.launcher.is_altjvm property is
1287 // private and is processed in process_sun_java_launcher_properties();
1288 // the sun.java.launcher property is passed on to the java application
1289 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1290 // append is true, writable is true, internal is false
1291 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1292 WriteableProperty, ExternalProperty);
1293 } else {
1294 if (strcmp(key, "sun.java.command") == 0) {
1295 char *old_java_command = _java_command;
1296 _java_command = os::strdup_check_oom(value, mtArguments);
1297 if (old_java_command != nullptr) {
1298 os::free(old_java_command);
1299 }
1300 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1301 // If this property is set on the command line then its value will be
1302 // displayed in VM error logs as the URL at which to submit such logs.
1303 // Normally the URL displayed in error logs is different from the value
1304 // of this system property, so a different property should have been
1305 // used here, but we leave this as-is in case someone depends upon it.
1306 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1307 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1308 // its value without going through the property list or making a Java call.
1309 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1310 if (old_java_vendor_url_bug != nullptr) {
1311 os::free((void *)old_java_vendor_url_bug);
1312 }
1313 }
1314
1315 // Create new property and add at the end of the list
1316 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1317 }
1318
1319 if (key != prop) {
1320 // SystemProperty copy passed value, thus free previously allocated
1321 // memory
1322 FreeHeap((void *)key);
1323 }
1324
1325 return true;
1326 }
1327
1328 //===========================================================================================================
1329 // Setting int/mixed/comp mode flags
1330
1331 void Arguments::set_mode_flags(Mode mode) {
1332 // Set up default values for all flags.
1333 // If you add a flag to any of the branches below,
1334 // add a default value for it here.
1335 _mode = mode;
1336
1337 // Ensure Agent_OnLoad has the correct initial values.
1338 // This may not be the final mode; mode may change later in onload phase.
1339 PropertyList_unique_add(&_system_properties, "java.vm.info",
1340 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1341
1342 UseInterpreter = true;
1343 UseCompiler = true;
1344 UseLoopCounter = true;
1345
1346 // Default values may be platform/compiler dependent -
1347 // use the saved values
1348 ClipInlining = Arguments::_ClipInlining;
1349 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1350 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1351 BackgroundCompilation = Arguments::_BackgroundCompilation;
1352
1353 // Change from defaults based on mode
1354 switch (mode) {
1355 default:
1356 ShouldNotReachHere();
1357 break;
1358 case _int:
1359 UseCompiler = false;
1360 UseLoopCounter = false;
1361 AlwaysCompileLoopMethods = false;
1362 UseOnStackReplacement = false;
1363 break;
1364 case _mixed:
1365 // same as default
1366 break;
1367 case _comp:
1368 UseInterpreter = false;
1369 BackgroundCompilation = false;
1370 ClipInlining = false;
1371 break;
1372 }
1373 }
1374
1375 // Conflict: required to use shared spaces (-Xshare:on), but
1376 // incompatible command line options were chosen.
1377 void Arguments::no_shared_spaces(const char* message) {
1378 if (RequireSharedSpaces) {
1379 jio_fprintf(defaultStream::error_stream(),
1380 "Class data sharing is inconsistent with other specified options.\n");
1381 vm_exit_during_initialization("Unable to use shared archive", message);
1382 } else {
1383 log_info(cds)("Unable to use shared archive: %s", message);
1384 UseSharedSpaces = false;
1385 }
1386 }
1387
1388 static void set_object_alignment() {
1389 // Object alignment.
1390 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1391 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1392 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1393 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1394 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1395 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1396
1397 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1398 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1399
1400 // Oop encoding heap max
1401 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1402 }
1403
1404 size_t Arguments::max_heap_for_compressed_oops() {
1405 // Avoid sign flip.
1406 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1407 // We need to fit both the null page and the heap into the memory budget, while
1408 // keeping alignment constraints of the heap. To guarantee the latter, as the
1409 // null page is located before the heap, we pad the null page to the conservative
1410 // maximum alignment that the GC may ever impose upon the heap.
1411 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1412 _conservative_max_heap_alignment);
1413
1414 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1415 NOT_LP64(ShouldNotReachHere(); return 0);
1416 }
1417
1418 void Arguments::set_use_compressed_oops() {
1419 #ifdef _LP64
1420 // MaxHeapSize is not set up properly at this point, but
1421 // the only value that can override MaxHeapSize if we are
1422 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1423 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1424
1425 if (max_heap_size <= max_heap_for_compressed_oops()) {
1426 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1427 FLAG_SET_ERGO(UseCompressedOops, true);
1428 }
1429 } else {
1430 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1431 warning("Max heap size too large for Compressed Oops");
1432 FLAG_SET_DEFAULT(UseCompressedOops, false);
1433 }
1434 }
1435 #endif // _LP64
1436 }
1437
1438 void Arguments::set_use_compressed_klass_ptrs() {
1439 #ifdef _LP64
1440 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1441 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1442 #endif // _LP64
1443 }
1444
1445 void Arguments::set_conservative_max_heap_alignment() {
1446 // The conservative maximum required alignment for the heap is the maximum of
1447 // the alignments imposed by several sources: any requirements from the heap
1448 // itself and the maximum page size we may run the VM with.
1449 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1450 _conservative_max_heap_alignment = MAX4(heap_alignment,
1451 os::vm_allocation_granularity(),
1452 os::max_page_size(),
1453 GCArguments::compute_heap_alignment());
1454 }
1455
1456 jint Arguments::set_ergonomics_flags() {
1457 GCConfig::initialize();
1458
1459 set_conservative_max_heap_alignment();
1460
1461 #ifdef _LP64
1462 set_use_compressed_oops();
1463 set_use_compressed_klass_ptrs();
1464
1465 // Also checks that certain machines are slower with compressed oops
1466 // in vm_version initialization code.
1467 #endif // _LP64
1468
1469 return JNI_OK;
1470 }
1471
1472 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1473 size_t max_allocatable;
1474 size_t result = limit;
1475 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1476 // The AggressiveHeap check is a temporary workaround to avoid calling
1477 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1478 // selected. This works because AggressiveHeap implies UseParallelGC
1479 // where we know the ratio will be 1. Once the AggressiveHeap option is
1480 // removed, this can be cleaned up.
1481 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1482 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1483 result = MIN2(result, max_allocatable / fraction);
1484 }
1485 return result;
1486 }
1487
1488 // Use static initialization to get the default before parsing
1489 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1490
1491 void Arguments::set_heap_size() {
1492 julong phys_mem;
1493
1494 // If the user specified one of these options, they
1495 // want specific memory sizing so do not limit memory
1496 // based on compressed oops addressability.
1497 // Also, memory limits will be calculated based on
1498 // available os physical memory, not our MaxRAM limit,
1499 // unless MaxRAM is also specified.
1500 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1501 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1502 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1503 !FLAG_IS_DEFAULT(MaxRAM));
1504 if (override_coop_limit) {
1505 if (FLAG_IS_DEFAULT(MaxRAM)) {
1506 phys_mem = os::physical_memory();
1507 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1508 } else {
1509 phys_mem = (julong)MaxRAM;
1510 }
1511 } else {
1512 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1513 : (julong)MaxRAM;
1514 }
1515
1516 // If the maximum heap size has not been set with -Xmx,
1517 // then set it as fraction of the size of physical memory,
1518 // respecting the maximum and minimum sizes of the heap.
1519 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1520 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1521 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1522 if (reasonable_min < MaxHeapSize) {
1523 // Small physical memory, so use a minimum fraction of it for the heap
1524 reasonable_max = reasonable_min;
1525 } else {
1526 // Not-small physical memory, so require a heap at least
1527 // as large as MaxHeapSize
1528 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1529 }
1530
1531 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1532 // Limit the heap size to ErgoHeapSizeLimit
1533 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1534 }
1535
1536 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1537
1538 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1539 // An initial heap size was specified on the command line,
1540 // so be sure that the maximum size is consistent. Done
1541 // after call to limit_heap_by_allocatable_memory because that
1542 // method might reduce the allocation size.
1543 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1544 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1545 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1546 }
1547
1548 #ifdef _LP64
1549 if (UseCompressedOops || UseCompressedClassPointers) {
1550 // HeapBaseMinAddress can be greater than default but not less than.
1551 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1552 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1553 // matches compressed oops printing flags
1554 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1555 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1556 DefaultHeapBaseMinAddress,
1557 DefaultHeapBaseMinAddress/G,
1558 HeapBaseMinAddress);
1559 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1560 }
1561 }
1562 }
1563 if (UseCompressedOops) {
1564 // Limit the heap size to the maximum possible when using compressed oops
1565 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1566
1567 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1568 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1569 // but it should be not less than default MaxHeapSize.
1570 max_coop_heap -= HeapBaseMinAddress;
1571 }
1572
1573 // If user specified flags prioritizing os physical
1574 // memory limits, then disable compressed oops if
1575 // limits exceed max_coop_heap and UseCompressedOops
1576 // was not specified.
1577 if (reasonable_max > max_coop_heap) {
1578 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1579 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1580 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1581 "Please check the setting of MaxRAMPercentage %5.2f."
1582 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1583 FLAG_SET_ERGO(UseCompressedOops, false);
1584 } else {
1585 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1586 }
1587 }
1588 }
1589 #endif // _LP64
1590
1591 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1592 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1593 }
1594
1595 // If the minimum or initial heap_size have not been set or requested to be set
1596 // ergonomically, set them accordingly.
1597 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1598 julong reasonable_minimum = (julong)(OldSize + NewSize);
1599
1600 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1601
1602 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1603
1604 if (InitialHeapSize == 0) {
1605 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1606 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1607
1608 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1609 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1610
1611 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1612 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1613 }
1614 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1615 // synchronize with InitialHeapSize to avoid errors with the default value.
1616 if (MinHeapSize == 0) {
1617 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1618 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1619 }
1620 }
1621 }
1622
1623 // This option inspects the machine and attempts to set various
1624 // parameters to be optimal for long-running, memory allocation
1625 // intensive jobs. It is intended for machines with large
1626 // amounts of cpu and memory.
1627 jint Arguments::set_aggressive_heap_flags() {
1628 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1629 // VM, but we may not be able to represent the total physical memory
1630 // available (like having 8gb of memory on a box but using a 32bit VM).
1631 // Thus, we need to make sure we're using a julong for intermediate
1632 // calculations.
1633 julong initHeapSize;
1634 julong total_memory = os::physical_memory();
1635
1636 if (total_memory < (julong) 256 * M) {
1637 jio_fprintf(defaultStream::error_stream(),
1638 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1639 vm_exit(1);
1640 }
1641
1642 // The heap size is half of available memory, or (at most)
1643 // all of possible memory less 160mb (leaving room for the OS
1644 // when using ISM). This is the maximum; because adaptive sizing
1645 // is turned on below, the actual space used may be smaller.
1646
1647 initHeapSize = MIN2(total_memory / (julong) 2,
1648 total_memory - (julong) 160 * M);
1649
1650 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1651
1652 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1653 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1654 return JNI_EINVAL;
1655 }
1656 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1657 return JNI_EINVAL;
1658 }
1659 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1660 return JNI_EINVAL;
1661 }
1662 }
1663 if (FLAG_IS_DEFAULT(NewSize)) {
1664 // Make the young generation 3/8ths of the total heap.
1665 if (FLAG_SET_CMDLINE(NewSize,
1666 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1667 return JNI_EINVAL;
1668 }
1669 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672 }
1673
1674 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1675 FLAG_SET_DEFAULT(UseLargePages, true);
1676 #endif
1677
1678 // Increase some data structure sizes for efficiency
1679 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1680 return JNI_EINVAL;
1681 }
1682 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1683 return JNI_EINVAL;
1684 }
1685 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1686 return JNI_EINVAL;
1687 }
1688
1689 // See the OldPLABSize comment below, but replace 'after promotion'
1690 // with 'after copying'. YoungPLABSize is the size of the survivor
1691 // space per-gc-thread buffers. The default is 4kw.
1692 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1693 return JNI_EINVAL;
1694 }
1695
1696 // OldPLABSize is the size of the buffers in the old gen that
1697 // UseParallelGC uses to promote live data that doesn't fit in the
1698 // survivor spaces. At any given time, there's one for each gc thread.
1699 // The default size is 1kw. These buffers are rarely used, since the
1700 // survivor spaces are usually big enough. For specjbb, however, there
1701 // are occasions when there's lots of live data in the young gen
1702 // and we end up promoting some of it. We don't have a definite
1703 // explanation for why bumping OldPLABSize helps, but the theory
1704 // is that a bigger PLAB results in retaining something like the
1705 // original allocation order after promotion, which improves mutator
1706 // locality. A minor effect may be that larger PLABs reduce the
1707 // number of PLAB allocation events during gc. The value of 8kw
1708 // was arrived at by experimenting with specjbb.
1709 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1710 return JNI_EINVAL;
1711 }
1712
1713 // Enable parallel GC and adaptive generation sizing
1714 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1715 return JNI_EINVAL;
1716 }
1717
1718 // Encourage steady state memory management
1719 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1720 return JNI_EINVAL;
1721 }
1722
1723 return JNI_OK;
1724 }
1725
1726 // This must be called after ergonomics.
1727 void Arguments::set_bytecode_flags() {
1728 if (!RewriteBytecodes) {
1729 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1730 }
1731 }
1732
1733 // Aggressive optimization flags
1734 jint Arguments::set_aggressive_opts_flags() {
1735 #ifdef COMPILER2
1736 if (AggressiveUnboxing) {
1737 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1738 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1739 } else if (!EliminateAutoBox) {
1740 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1741 AggressiveUnboxing = false;
1742 }
1743 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1744 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1745 } else if (!DoEscapeAnalysis) {
1746 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1747 AggressiveUnboxing = false;
1748 }
1749 }
1750 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1751 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1752 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1753 }
1754 // Feed the cache size setting into the JDK
1755 char buffer[1024];
1756 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1757 if (!add_property(buffer)) {
1758 return JNI_ENOMEM;
1759 }
1760 }
1761 #endif
1762
1763 return JNI_OK;
1764 }
1765
1766 //===========================================================================================================
1767
1768 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1769 if (_sun_java_launcher != _default_java_launcher) {
1770 os::free(const_cast<char*>(_sun_java_launcher));
1771 }
1772 _sun_java_launcher = os::strdup_check_oom(launcher);
1773 }
1774
1775 bool Arguments::created_by_java_launcher() {
1776 assert(_sun_java_launcher != nullptr, "property must have value");
1777 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1778 }
1779
1780 bool Arguments::sun_java_launcher_is_altjvm() {
1781 return _sun_java_launcher_is_altjvm;
1782 }
1783
1784 //===========================================================================================================
1785 // Parsing of main arguments
1786
1787 unsigned int addreads_count = 0;
1788 unsigned int addexports_count = 0;
1789 unsigned int addopens_count = 0;
1790 unsigned int addmods_count = 0;
1791 unsigned int patch_mod_count = 0;
1792 unsigned int enable_native_access_count = 0;
1793
1794 // Check the consistency of vm_init_args
1795 bool Arguments::check_vm_args_consistency() {
1796 // Method for adding checks for flag consistency.
1797 // The intent is to warn the user of all possible conflicts,
1798 // before returning an error.
1799 // Note: Needs platform-dependent factoring.
1800 bool status = true;
1801
1802 if (TLABRefillWasteFraction == 0) {
1803 jio_fprintf(defaultStream::error_stream(),
1804 "TLABRefillWasteFraction should be a denominator, "
1805 "not " SIZE_FORMAT "\n",
1806 TLABRefillWasteFraction);
1807 status = false;
1808 }
1809
1810 status = CompilerConfig::check_args_consistency(status);
1811 #if INCLUDE_JVMCI
1812 if (status && EnableJVMCI) {
1813 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1814 AddProperty, UnwriteableProperty, InternalProperty);
1815 /*
1816 * Ioi - 2023/05/19. There's no need for this with my patch-jdk.sh script, which adds
1817 * jdk.internal.vm.ci as one of the default modules. Using -Djdk.module.addmods will
1818 * cause the full module graph to be disabled and slow down performance.
1819 */
1820 if (!TempDisableAddJVMCIModule && ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1821 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1822 return false;
1823 }
1824 }
1825 }
1826 #endif
1827
1828 #if INCLUDE_JFR
1829 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1830 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1831 return false;
1832 }
1833 }
1834 #endif
1835
1836 #ifndef SUPPORT_RESERVED_STACK_AREA
1837 if (StackReservedPages != 0) {
1838 FLAG_SET_CMDLINE(StackReservedPages, 0);
1839 warning("Reserved Stack Area not supported on this platform");
1840 }
1841 #endif
1842
1843 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1844 if (LockingMode == LM_LIGHTWEIGHT) {
1845 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1846 warning("New lightweight locking not supported on this platform");
1847 }
1848 #endif
1849
1850 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1851 if (LockingMode == LM_MONITOR) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1854 return false;
1855 }
1856 #endif
1857 #if defined(X86) && !defined(ZERO)
1858 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
1859 jio_fprintf(defaultStream::error_stream(),
1860 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n");
1861
1862 return false;
1863 }
1864 #endif
1865 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1866 jio_fprintf(defaultStream::error_stream(),
1867 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1868 return false;
1869 }
1870 return status;
1871 }
1872
1873 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1874 const char* option_type) {
1875 if (ignore) return false;
1876
1877 const char* spacer = " ";
1878 if (option_type == nullptr) {
1879 option_type = ++spacer; // Set both to the empty string.
1880 }
1881
1882 jio_fprintf(defaultStream::error_stream(),
1883 "Unrecognized %s%soption: %s\n", option_type, spacer,
1884 option->optionString);
1885 return true;
1886 }
1887
1888 static const char* user_assertion_options[] = {
1889 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1890 };
1891
1892 static const char* system_assertion_options[] = {
1893 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1894 };
1895
1896 bool Arguments::parse_uint(const char* value,
1897 uint* uint_arg,
1898 uint min_size) {
1899 uint n;
1900 if (!parse_integer(value, &n)) {
1901 return false;
1902 }
1903 if (n >= min_size) {
1904 *uint_arg = n;
1905 return true;
1906 } else {
1907 return false;
1908 }
1909 }
1910
1911 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1912 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1913 CDSConfig::check_internal_module_property(prop_name, prop_value);
1914 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1915 char* property = AllocateHeap(prop_len, mtArguments);
1916 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1917 if (ret < 0 || ret >= (int)prop_len) {
1918 FreeHeap(property);
1919 return false;
1920 }
1921 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1922 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1923 // that multiple occurrences of the associated flag just causes the existing property value to be
1924 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1925 // to a property after we have finished flag processing.
1926 bool added = add_property(property, WriteableProperty, internal);
1927 FreeHeap(property);
1928 return added;
1929 }
1930
1931 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1932 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1933 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1934 const unsigned int props_count_limit = 1000;
1935 const int max_digits = 3;
1936 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1937
1938 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1939 if (count < props_count_limit) {
1940 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1941 char* property = AllocateHeap(prop_len, mtArguments);
1942 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1943 if (ret < 0 || ret >= (int)prop_len) {
1944 FreeHeap(property);
1945 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1946 return false;
1947 }
1948 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1949 FreeHeap(property);
1950 return added;
1951 }
1952
1953 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1954 return false;
1955 }
1956
1957 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1958 julong* long_arg,
1959 julong min_size,
1960 julong max_size) {
1961 if (!parse_integer(s, long_arg)) return arg_unreadable;
1962 return check_memory_size(*long_arg, min_size, max_size);
1963 }
1964
1965 // Parse JavaVMInitArgs structure
1966
1967 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1968 const JavaVMInitArgs *java_tool_options_args,
1969 const JavaVMInitArgs *java_options_args,
1970 const JavaVMInitArgs *cmd_line_args) {
1971 bool patch_mod_javabase = false;
1972
1973 // Save default settings for some mode flags
1974 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1975 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1976 Arguments::_ClipInlining = ClipInlining;
1977 Arguments::_BackgroundCompilation = BackgroundCompilation;
1978
1979 // Remember the default value of SharedBaseAddress.
1980 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1981
1982 // Setup flags for mixed which is the default
1983 set_mode_flags(_mixed);
1984
1985 // Parse args structure generated from java.base vm options resource
1986 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1987 if (result != JNI_OK) {
1988 return result;
1989 }
1990
1991 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1992 // variable (if present).
1993 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1994 if (result != JNI_OK) {
1995 return result;
1996 }
1997
1998 // Parse args structure generated from the command line flags.
1999 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2000 if (result != JNI_OK) {
2001 return result;
2002 }
2003
2004 // Parse args structure generated from the _JAVA_OPTIONS environment
2005 // variable (if present) (mimics classic VM)
2006 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2007 if (result != JNI_OK) {
2008 return result;
2009 }
2010
2011 // Disable CDS for exploded image
2012 if (!has_jimage()) {
2013 no_shared_spaces("CDS disabled on exploded JDK");
2014 }
2015
2016 // We need to ensure processor and memory resources have been properly
2017 // configured - which may rely on arguments we just processed - before
2018 // doing the final argument processing. Any argument processing that
2019 // needs to know about processor and memory resources must occur after
2020 // this point.
2021
2022 os::init_container_support();
2023
2024 SystemMemoryBarrier::initialize();
2025
2026 // Do final processing now that all arguments have been parsed
2027 result = finalize_vm_init_args(patch_mod_javabase);
2028 if (result != JNI_OK) {
2029 return result;
2030 }
2031
2032 return JNI_OK;
2033 }
2034
2035 #if !INCLUDE_JVMTI
2036 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2037 // represents a valid JDWP agent. is_path==true denotes that we
2038 // are dealing with -agentpath (case where name is a path), otherwise with
2039 // -agentlib
2040 static bool valid_jdwp_agent(char *name, bool is_path) {
2041 char *_name;
2042 const char *_jdwp = "jdwp";
2043 size_t _len_jdwp, _len_prefix;
2044
2045 if (is_path) {
2046 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2047 return false;
2048 }
2049
2050 _name++; // skip past last path separator
2051 _len_prefix = strlen(JNI_LIB_PREFIX);
2052
2053 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2054 return false;
2055 }
2056
2057 _name += _len_prefix;
2058 _len_jdwp = strlen(_jdwp);
2059
2060 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2061 _name += _len_jdwp;
2062 }
2063 else {
2064 return false;
2065 }
2066
2067 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2068 return false;
2069 }
2070
2071 return true;
2072 }
2073
2074 if (strcmp(name, _jdwp) == 0) {
2075 return true;
2076 }
2077
2078 return false;
2079 }
2080 #endif
2081
2082 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2083 // --patch-module=<module>=<file>(<pathsep><file>)*
2084 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2085 // Find the equal sign between the module name and the path specification
2086 const char* module_equal = strchr(patch_mod_tail, '=');
2087 if (module_equal == nullptr) {
2088 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2089 return JNI_ERR;
2090 } else {
2091 // Pick out the module name
2092 size_t module_len = module_equal - patch_mod_tail;
2093 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2094 if (module_name != nullptr) {
2095 memcpy(module_name, patch_mod_tail, module_len);
2096 *(module_name + module_len) = '\0';
2097 // The path piece begins one past the module_equal sign
2098 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2099 FREE_C_HEAP_ARRAY(char, module_name);
2100 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2101 return JNI_ENOMEM;
2102 }
2103 } else {
2104 return JNI_ENOMEM;
2105 }
2106 }
2107 return JNI_OK;
2108 }
2109
2110 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2111 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2112 // The min and max sizes match the values in globals.hpp, but scaled
2113 // with K. The values have been chosen so that alignment with page
2114 // size doesn't change the max value, which makes the conversions
2115 // back and forth between Xss value and ThreadStackSize value easier.
2116 // The values have also been chosen to fit inside a 32-bit signed type.
2117 const julong min_ThreadStackSize = 0;
2118 const julong max_ThreadStackSize = 1 * M;
2119
2120 // Make sure the above values match the range set in globals.hpp
2121 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2122 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2123 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2124
2125 const julong min_size = min_ThreadStackSize * K;
2126 const julong max_size = max_ThreadStackSize * K;
2127
2128 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2129
2130 julong size = 0;
2131 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2132 if (errcode != arg_in_range) {
2133 bool silent = (option == nullptr); // Allow testing to silence error messages
2134 if (!silent) {
2135 jio_fprintf(defaultStream::error_stream(),
2136 "Invalid thread stack size: %s\n", option->optionString);
2137 describe_range_error(errcode);
2138 }
2139 return JNI_EINVAL;
2140 }
2141
2142 // Internally track ThreadStackSize in units of 1024 bytes.
2143 const julong size_aligned = align_up(size, K);
2144 assert(size <= size_aligned,
2145 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2146 size, size_aligned);
2147
2148 const julong size_in_K = size_aligned / K;
2149 assert(size_in_K < (julong)max_intx,
2150 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2151 size_in_K);
2152
2153 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2154 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2155 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2156 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2157 max_expanded, size_in_K);
2158
2159 *out_ThreadStackSize = (intx)size_in_K;
2160
2161 return JNI_OK;
2162 }
2163
2164 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2165 // For match_option to return remaining or value part of option string
2166 const char* tail;
2167
2168 // iterate over arguments
2169 for (int index = 0; index < args->nOptions; index++) {
2170 bool is_absolute_path = false; // for -agentpath vs -agentlib
2171
2172 const JavaVMOption* option = args->options + index;
2173
2174 if (!match_option(option, "-Djava.class.path", &tail) &&
2175 !match_option(option, "-Dsun.java.command", &tail) &&
2176 !match_option(option, "-Dsun.java.launcher", &tail)) {
2177
2178 // add all jvm options to the jvm_args string. This string
2179 // is used later to set the java.vm.args PerfData string constant.
2180 // the -Djava.class.path and the -Dsun.java.command options are
2181 // omitted from jvm_args string as each have their own PerfData
2182 // string constant object.
2183 build_jvm_args(option->optionString);
2184 }
2185
2186 // -verbose:[class/module/gc/jni]
2187 if (match_option(option, "-verbose", &tail)) {
2188 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2189 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2190 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2191 } else if (!strcmp(tail, ":module")) {
2192 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2193 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2194 } else if (!strcmp(tail, ":gc")) {
2195 if (_legacyGCLogging.lastFlag == 0) {
2196 _legacyGCLogging.lastFlag = 1;
2197 }
2198 } else if (!strcmp(tail, ":jni")) {
2199 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2200 }
2201 // -da / -ea / -disableassertions / -enableassertions
2202 // These accept an optional class/package name separated by a colon, e.g.,
2203 // -da:java.lang.Thread.
2204 } else if (match_option(option, user_assertion_options, &tail, true)) {
2205 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2206 if (*tail == '\0') {
2207 JavaAssertions::setUserClassDefault(enable);
2208 } else {
2209 assert(*tail == ':', "bogus match by match_option()");
2210 JavaAssertions::addOption(tail + 1, enable);
2211 }
2212 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2213 } else if (match_option(option, system_assertion_options, &tail, false)) {
2214 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2215 JavaAssertions::setSystemClassDefault(enable);
2216 // -bootclasspath:
2217 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2218 jio_fprintf(defaultStream::output_stream(),
2219 "-Xbootclasspath is no longer a supported option.\n");
2220 return JNI_EINVAL;
2221 // -bootclasspath/a:
2222 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2223 Arguments::append_sysclasspath(tail);
2224 // -bootclasspath/p:
2225 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2226 jio_fprintf(defaultStream::output_stream(),
2227 "-Xbootclasspath/p is no longer a supported option.\n");
2228 return JNI_EINVAL;
2229 // -Xrun
2230 } else if (match_option(option, "-Xrun", &tail)) {
2231 if (tail != nullptr) {
2232 const char* pos = strchr(tail, ':');
2233 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2234 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2235 jio_snprintf(name, len + 1, "%s", tail);
2236
2237 char *options = nullptr;
2238 if(pos != nullptr) {
2239 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2240 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2241 }
2242 #if !INCLUDE_JVMTI
2243 if (strcmp(name, "jdwp") == 0) {
2244 jio_fprintf(defaultStream::error_stream(),
2245 "Debugging agents are not supported in this VM\n");
2246 return JNI_ERR;
2247 }
2248 #endif // !INCLUDE_JVMTI
2249 JvmtiAgentList::add_xrun(name, options, false);
2250 FREE_C_HEAP_ARRAY(char, name);
2251 FREE_C_HEAP_ARRAY(char, options);
2252 }
2253 } else if (match_option(option, "--add-reads=", &tail)) {
2254 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2255 return JNI_ENOMEM;
2256 }
2257 } else if (match_option(option, "--add-exports=", &tail)) {
2258 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2259 return JNI_ENOMEM;
2260 }
2261 } else if (match_option(option, "--add-opens=", &tail)) {
2262 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2263 return JNI_ENOMEM;
2264 }
2265 } else if (match_option(option, "--add-modules=", &tail)) {
2266 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2267 return JNI_ENOMEM;
2268 }
2269 } else if (match_option(option, "--enable-native-access=", &tail)) {
2270 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2271 return JNI_ENOMEM;
2272 }
2273 } else if (match_option(option, "--limit-modules=", &tail)) {
2274 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2275 return JNI_ENOMEM;
2276 }
2277 } else if (match_option(option, "--module-path=", &tail)) {
2278 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2279 return JNI_ENOMEM;
2280 }
2281 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2282 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2283 return JNI_ENOMEM;
2284 }
2285 } else if (match_option(option, "--patch-module=", &tail)) {
2286 // --patch-module=<module>=<file>(<pathsep><file>)*
2287 int res = process_patch_mod_option(tail, patch_mod_javabase);
2288 if (res != JNI_OK) {
2289 return res;
2290 }
2291 } else if (match_option(option, "--illegal-access=", &tail)) {
2292 char version[256];
2293 JDK_Version::jdk(17).to_string(version, sizeof(version));
2294 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2295 // -agentlib and -agentpath
2296 } else if (match_option(option, "-agentlib:", &tail) ||
2297 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2298 if(tail != nullptr) {
2299 const char* pos = strchr(tail, '=');
2300 char* name;
2301 if (pos == nullptr) {
2302 name = os::strdup_check_oom(tail, mtArguments);
2303 } else {
2304 size_t len = pos - tail;
2305 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2306 memcpy(name, tail, len);
2307 name[len] = '\0';
2308 }
2309
2310 char *options = nullptr;
2311 if(pos != nullptr) {
2312 options = os::strdup_check_oom(pos + 1, mtArguments);
2313 }
2314 #if !INCLUDE_JVMTI
2315 if (valid_jdwp_agent(name, is_absolute_path)) {
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(name, options, is_absolute_path);
2322 os::free(name);
2323 os::free(options);
2324 }
2325 // -javaagent
2326 } else if (match_option(option, "-javaagent:", &tail)) {
2327 #if !INCLUDE_JVMTI
2328 jio_fprintf(defaultStream::error_stream(),
2329 "Instrumentation agents are not supported in this VM\n");
2330 return JNI_ERR;
2331 #else
2332 if (tail != nullptr) {
2333 size_t length = strlen(tail) + 1;
2334 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2335 jio_snprintf(options, length, "%s", tail);
2336 JvmtiAgentList::add("instrument", options, false);
2337 FREE_C_HEAP_ARRAY(char, options);
2338
2339 // java agents need module java.instrument
2340 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2341 return JNI_ENOMEM;
2342 }
2343 }
2344 #endif // !INCLUDE_JVMTI
2345 // --enable_preview
2346 } else if (match_option(option, "--enable-preview")) {
2347 set_enable_preview();
2348 // -Xnoclassgc
2349 } else if (match_option(option, "-Xnoclassgc")) {
2350 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2351 return JNI_EINVAL;
2352 }
2353 // -Xbatch
2354 } else if (match_option(option, "-Xbatch")) {
2355 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2356 return JNI_EINVAL;
2357 }
2358 // -Xmn for compatibility with other JVM vendors
2359 } else if (match_option(option, "-Xmn", &tail)) {
2360 julong long_initial_young_size = 0;
2361 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2362 if (errcode != arg_in_range) {
2363 jio_fprintf(defaultStream::error_stream(),
2364 "Invalid initial young generation size: %s\n", option->optionString);
2365 describe_range_error(errcode);
2366 return JNI_EINVAL;
2367 }
2368 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2369 return JNI_EINVAL;
2370 }
2371 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2372 return JNI_EINVAL;
2373 }
2374 // -Xms
2375 } else if (match_option(option, "-Xms", &tail)) {
2376 julong size = 0;
2377 // an initial heap size of 0 means automatically determine
2378 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2379 if (errcode != arg_in_range) {
2380 jio_fprintf(defaultStream::error_stream(),
2381 "Invalid initial heap size: %s\n", option->optionString);
2382 describe_range_error(errcode);
2383 return JNI_EINVAL;
2384 }
2385 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2386 return JNI_EINVAL;
2387 }
2388 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2389 return JNI_EINVAL;
2390 }
2391 // -Xmx
2392 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2393 julong long_max_heap_size = 0;
2394 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2395 if (errcode != arg_in_range) {
2396 jio_fprintf(defaultStream::error_stream(),
2397 "Invalid maximum heap size: %s\n", option->optionString);
2398 describe_range_error(errcode);
2399 return JNI_EINVAL;
2400 }
2401 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2402 return JNI_EINVAL;
2403 }
2404 // Xmaxf
2405 } else if (match_option(option, "-Xmaxf", &tail)) {
2406 char* err;
2407 int maxf = (int)(strtod(tail, &err) * 100);
2408 if (*err != '\0' || *tail == '\0') {
2409 jio_fprintf(defaultStream::error_stream(),
2410 "Bad max heap free percentage size: %s\n",
2411 option->optionString);
2412 return JNI_EINVAL;
2413 } else {
2414 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2415 return JNI_EINVAL;
2416 }
2417 }
2418 // Xminf
2419 } else if (match_option(option, "-Xminf", &tail)) {
2420 char* err;
2421 int minf = (int)(strtod(tail, &err) * 100);
2422 if (*err != '\0' || *tail == '\0') {
2423 jio_fprintf(defaultStream::error_stream(),
2424 "Bad min heap free percentage size: %s\n",
2425 option->optionString);
2426 return JNI_EINVAL;
2427 } else {
2428 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2429 return JNI_EINVAL;
2430 }
2431 }
2432 // -Xss
2433 } else if (match_option(option, "-Xss", &tail)) {
2434 intx value = 0;
2435 jint err = parse_xss(option, tail, &value);
2436 if (err != JNI_OK) {
2437 return err;
2438 }
2439 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2440 return JNI_EINVAL;
2441 }
2442 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2443 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2444 julong long_ReservedCodeCacheSize = 0;
2445
2446 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2447 if (errcode != arg_in_range) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Invalid maximum code cache size: %s.\n", option->optionString);
2450 return JNI_EINVAL;
2451 }
2452 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2453 return JNI_EINVAL;
2454 }
2455 // -green
2456 } else if (match_option(option, "-green")) {
2457 jio_fprintf(defaultStream::error_stream(),
2458 "Green threads support not available\n");
2459 return JNI_EINVAL;
2460 // -native
2461 } else if (match_option(option, "-native")) {
2462 // HotSpot always uses native threads, ignore silently for compatibility
2463 // -Xrs
2464 } else if (match_option(option, "-Xrs")) {
2465 // Classic/EVM option, new functionality
2466 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2467 return JNI_EINVAL;
2468 }
2469 // -Xprof
2470 } else if (match_option(option, "-Xprof")) {
2471 char version[256];
2472 // Obsolete in JDK 10
2473 JDK_Version::jdk(10).to_string(version, sizeof(version));
2474 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2475 // -Xinternalversion
2476 } else if (match_option(option, "-Xinternalversion")) {
2477 jio_fprintf(defaultStream::output_stream(), "%s\n",
2478 VM_Version::internal_vm_info_string());
2479 vm_exit(0);
2480 #ifndef PRODUCT
2481 // -Xprintflags
2482 } else if (match_option(option, "-Xprintflags")) {
2483 JVMFlag::printFlags(tty, false);
2484 vm_exit(0);
2485 #endif
2486 // -D
2487 } else if (match_option(option, "-D", &tail)) {
2488 const char* value;
2489 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2490 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2491 // abort if -Djava.endorsed.dirs is set
2492 jio_fprintf(defaultStream::output_stream(),
2493 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2494 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2495 return JNI_EINVAL;
2496 }
2497 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2498 *value != '\0' && strcmp(value, "\"\"") != 0) {
2499 // abort if -Djava.ext.dirs is set
2500 jio_fprintf(defaultStream::output_stream(),
2501 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2502 return JNI_EINVAL;
2503 }
2504 // Check for module related properties. They must be set using the modules
2505 // options. For example: use "--add-modules=java.sql", not
2506 // "-Djdk.module.addmods=java.sql"
2507 if (is_internal_module_property(option->optionString + 2)) {
2508 needs_module_property_warning = true;
2509 continue;
2510 }
2511 if (!add_property(tail)) {
2512 return JNI_ENOMEM;
2513 }
2514 // Out of the box management support
2515 if (match_option(option, "-Dcom.sun.management", &tail)) {
2516 #if INCLUDE_MANAGEMENT
2517 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2518 return JNI_EINVAL;
2519 }
2520 // management agent in module jdk.management.agent
2521 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2522 return JNI_ENOMEM;
2523 }
2524 #else
2525 jio_fprintf(defaultStream::output_stream(),
2526 "-Dcom.sun.management is not supported in this VM.\n");
2527 return JNI_ERR;
2528 #endif
2529 }
2530 // -Xint
2531 } else if (match_option(option, "-Xint")) {
2532 set_mode_flags(_int);
2533 mode_flag_cmd_line = true;
2534 // -Xmixed
2535 } else if (match_option(option, "-Xmixed")) {
2536 set_mode_flags(_mixed);
2537 mode_flag_cmd_line = true;
2538 // -Xcomp
2539 } else if (match_option(option, "-Xcomp")) {
2540 // for testing the compiler; turn off all flags that inhibit compilation
2541 set_mode_flags(_comp);
2542 mode_flag_cmd_line = true;
2543 // -Xshare:dump
2544 } else if (match_option(option, "-Xshare:dump")) {
2545 CDSConfig::enable_dumping_static_archive();
2546 // -Xshare:on
2547 } else if (match_option(option, "-Xshare:on")) {
2548 UseSharedSpaces = true;
2549 RequireSharedSpaces = true;
2550 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2551 } else if (match_option(option, "-Xshare:auto")) {
2552 UseSharedSpaces = true;
2553 RequireSharedSpaces = false;
2554 xshare_auto_cmd_line = true;
2555 // -Xshare:off
2556 } else if (match_option(option, "-Xshare:off")) {
2557 UseSharedSpaces = false;
2558 RequireSharedSpaces = false;
2559 // -Xverify
2560 } else if (match_option(option, "-Xverify", &tail)) {
2561 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2562 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2563 return JNI_EINVAL;
2564 }
2565 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2566 return JNI_EINVAL;
2567 }
2568 } else if (strcmp(tail, ":remote") == 0) {
2569 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2570 return JNI_EINVAL;
2571 }
2572 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2573 return JNI_EINVAL;
2574 }
2575 } else if (strcmp(tail, ":none") == 0) {
2576 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2577 return JNI_EINVAL;
2578 }
2579 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2580 return JNI_EINVAL;
2581 }
2582 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2583 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2584 return JNI_EINVAL;
2585 }
2586 // -Xdebug
2587 } else if (match_option(option, "-Xdebug")) {
2588 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2589 } else if (match_option(option, "-Xloggc:", &tail)) {
2590 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2591 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2592 _legacyGCLogging.lastFlag = 2;
2593 _legacyGCLogging.file = os::strdup_check_oom(tail);
2594 } else if (match_option(option, "-Xlog", &tail)) {
2595 bool ret = false;
2596 if (strcmp(tail, ":help") == 0) {
2597 fileStream stream(defaultStream::output_stream());
2598 LogConfiguration::print_command_line_help(&stream);
2599 vm_exit(0);
2600 } else if (strcmp(tail, ":disable") == 0) {
2601 LogConfiguration::disable_logging();
2602 ret = true;
2603 } else if (strcmp(tail, ":async") == 0) {
2604 LogConfiguration::set_async_mode(true);
2605 ret = true;
2606 } else if (*tail == '\0') {
2607 ret = LogConfiguration::parse_command_line_arguments();
2608 assert(ret, "-Xlog without arguments should never fail to parse");
2609 } else if (*tail == ':') {
2610 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2611 }
2612 if (ret == false) {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2615 tail);
2616 return JNI_EINVAL;
2617 }
2618 // JNI hooks
2619 } else if (match_option(option, "-Xcheck", &tail)) {
2620 if (!strcmp(tail, ":jni")) {
2621 #if !INCLUDE_JNI_CHECK
2622 warning("JNI CHECKING is not supported in this VM");
2623 #else
2624 CheckJNICalls = true;
2625 #endif // INCLUDE_JNI_CHECK
2626 } else if (is_bad_option(option, args->ignoreUnrecognized,
2627 "check")) {
2628 return JNI_EINVAL;
2629 }
2630 } else if (match_option(option, "vfprintf")) {
2631 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2632 } else if (match_option(option, "exit")) {
2633 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2634 } else if (match_option(option, "abort")) {
2635 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2636 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2637 // and the last option wins.
2638 } else if (match_option(option, "-XX:+NeverTenure")) {
2639 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2640 return JNI_EINVAL;
2641 }
2642 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2643 return JNI_EINVAL;
2644 }
2645 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2646 return JNI_EINVAL;
2647 }
2648 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2649 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2650 return JNI_EINVAL;
2651 }
2652 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2653 return JNI_EINVAL;
2654 }
2655 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2656 return JNI_EINVAL;
2657 }
2658 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2659 uint max_tenuring_thresh = 0;
2660 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2663 return JNI_EINVAL;
2664 }
2665
2666 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669
2670 if (MaxTenuringThreshold == 0) {
2671 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2672 return JNI_EINVAL;
2673 }
2674 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2675 return JNI_EINVAL;
2676 }
2677 } else {
2678 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2679 return JNI_EINVAL;
2680 }
2681 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2682 return JNI_EINVAL;
2683 }
2684 }
2685 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2686 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2693 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2694 return JNI_EINVAL;
2695 }
2696 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2697 return JNI_EINVAL;
2698 }
2699 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2700 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2701 return JNI_EINVAL;
2702 }
2703 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2704 return JNI_EINVAL;
2705 }
2706 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2707 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2708 return JNI_EINVAL;
2709 }
2710 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2711 return JNI_EINVAL;
2712 }
2713 } else if (match_option(option, "--finalization=", &tail)) {
2714 if (strcmp(tail, "enabled") == 0) {
2715 InstanceKlass::set_finalization_enabled(true);
2716 } else if (strcmp(tail, "disabled") == 0) {
2717 InstanceKlass::set_finalization_enabled(false);
2718 } else {
2719 jio_fprintf(defaultStream::error_stream(),
2720 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2721 tail);
2722 return JNI_EINVAL;
2723 }
2724 #if !defined(DTRACE_ENABLED)
2725 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "DTraceMethodProbes flag is not applicable for this configuration\n");
2728 return JNI_EINVAL;
2729 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "DTraceAllocProbes flag is not applicable for this configuration\n");
2732 return JNI_EINVAL;
2733 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2734 jio_fprintf(defaultStream::error_stream(),
2735 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2736 return JNI_EINVAL;
2737 #endif // !defined(DTRACE_ENABLED)
2738 #ifdef ASSERT
2739 } else if (match_option(option, "-XX:+FullGCALot")) {
2740 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2741 return JNI_EINVAL;
2742 }
2743 #endif
2744 #if !INCLUDE_MANAGEMENT
2745 } else if (match_option(option, "-XX:+ManagementServer")) {
2746 jio_fprintf(defaultStream::error_stream(),
2747 "ManagementServer is not supported in this VM.\n");
2748 return JNI_ERR;
2749 #endif // INCLUDE_MANAGEMENT
2750 #if INCLUDE_JVMCI
2751 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2752 if (EnableJVMCIProduct) {
2753 jio_fprintf(defaultStream::error_stream(),
2754 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2755 return JNI_EINVAL;
2756 }
2757 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2758 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2759 if (use_graal_jit) {
2760 const char* jvmci_compiler = get_property("jvmci.Compiler");
2761 if (jvmci_compiler != nullptr) {
2762 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2763 jio_fprintf(defaultStream::error_stream(),
2764 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2765 return JNI_ERR;
2766 }
2767 } else if (!add_property("jvmci.Compiler=graal")) {
2768 return JNI_ENOMEM;
2769 }
2770 }
2771
2772 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2773 if (EnableJVMCIProduct) {
2774 continue;
2775 }
2776 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2777 // Allow this flag if it has been unlocked.
2778 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2779 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2780 jio_fprintf(defaultStream::error_stream(),
2781 "Unable to enable JVMCI in product mode\n");
2782 return JNI_ERR;
2783 }
2784 }
2785 // The flag was locked so process normally to report that error
2786 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2787 return JNI_EINVAL;
2788 }
2789 #endif // INCLUDE_JVMCI
2790 #if INCLUDE_JFR
2791 } else if (match_jfr_option(&option)) {
2792 return JNI_EINVAL;
2793 #endif
2794 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2795 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2796 // already been handled
2797 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2798 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2799 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2800 return JNI_EINVAL;
2801 }
2802 }
2803 // Unknown option
2804 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2805 return JNI_ERR;
2806 }
2807 }
2808
2809 // PrintSharedArchiveAndExit will turn on
2810 // -Xshare:on
2811 // -Xlog:class+path=info
2812 if (PrintSharedArchiveAndExit) {
2813 UseSharedSpaces = true;
2814 RequireSharedSpaces = true;
2815 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2816 }
2817
2818 fix_appclasspath();
2819
2820 return JNI_OK;
2821 }
2822
2823 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2824 // For java.base check for duplicate --patch-module options being specified on the command line.
2825 // This check is only required for java.base, all other duplicate module specifications
2826 // will be checked during module system initialization. The module system initialization
2827 // will throw an ExceptionInInitializerError if this situation occurs.
2828 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2829 if (*patch_mod_javabase) {
2830 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2831 } else {
2832 *patch_mod_javabase = true;
2833 }
2834 }
2835
2836 // Create GrowableArray lazily, only if --patch-module has been specified
2837 if (_patch_mod_prefix == nullptr) {
2838 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2839 }
2840
2841 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2842 }
2843
2844 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2845 //
2846 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2847 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2848 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2849 // path is treated as the current directory.
2850 //
2851 // This causes problems with CDS, which requires that all directories specified in the classpath
2852 // must be empty. In most cases, applications do NOT want to load classes from the current
2853 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2854 // scripts compatible with CDS.
2855 void Arguments::fix_appclasspath() {
2856 if (IgnoreEmptyClassPaths) {
2857 const char separator = *os::path_separator();
2858 const char* src = _java_class_path->value();
2859
2860 // skip over all the leading empty paths
2861 while (*src == separator) {
2862 src ++;
2863 }
2864
2865 char* copy = os::strdup_check_oom(src, mtArguments);
2866
2867 // trim all trailing empty paths
2868 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2869 *tail = '\0';
2870 }
2871
2872 char from[3] = {separator, separator, '\0'};
2873 char to [2] = {separator, '\0'};
2874 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2875 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2876 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2877 }
2878
2879 _java_class_path->set_writeable_value(copy);
2880 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2881 }
2882 }
2883
2884 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2885 // check if the default lib/endorsed directory exists; if so, error
2886 char path[JVM_MAXPATHLEN];
2887 const char* fileSep = os::file_separator();
2888 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2889
2890 DIR* dir = os::opendir(path);
2891 if (dir != nullptr) {
2892 jio_fprintf(defaultStream::output_stream(),
2893 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2894 "in modular form will be supported via the concept of upgradeable modules.\n");
2895 os::closedir(dir);
2896 return JNI_ERR;
2897 }
2898
2899 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2900 dir = os::opendir(path);
2901 if (dir != nullptr) {
2902 jio_fprintf(defaultStream::output_stream(),
2903 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2904 "Use -classpath instead.\n.");
2905 os::closedir(dir);
2906 return JNI_ERR;
2907 }
2908
2909 // This must be done after all arguments have been processed
2910 // and the container support has been initialized since AggressiveHeap
2911 // relies on the amount of total memory available.
2912 if (AggressiveHeap) {
2913 jint result = set_aggressive_heap_flags();
2914 if (result != JNI_OK) {
2915 return result;
2916 }
2917 }
2918
2919 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2920 // but like -Xint, leave compilation thresholds unaffected.
2921 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2922 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2923 set_mode_flags(_int);
2924 }
2925
2926 #ifdef ZERO
2927 // Zero always runs in interpreted mode
2928 set_mode_flags(_int);
2929 #endif
2930
2931 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2932 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2933 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2934 }
2935
2936 #if !COMPILER2_OR_JVMCI
2937 // Don't degrade server performance for footprint
2938 if (FLAG_IS_DEFAULT(UseLargePages) &&
2939 MaxHeapSize < LargePageHeapSizeThreshold) {
2940 // No need for large granularity pages w/small heaps.
2941 // Note that large pages are enabled/disabled for both the
2942 // Java heap and the code cache.
2943 FLAG_SET_DEFAULT(UseLargePages, false);
2944 }
2945
2946 UNSUPPORTED_OPTION(ProfileInterpreter);
2947 #endif
2948
2949 // Parse the CompilationMode flag
2950 if (!CompilationModeFlag::initialize()) {
2951 return JNI_ERR;
2952 }
2953
2954 if (!check_vm_args_consistency()) {
2955 return JNI_ERR;
2956 }
2957
2958 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
2959 return JNI_ERR;
2960 }
2961
2962 if (StoreCachedCode) {
2963 FLAG_SET_ERGO_IF_DEFAULT(CachedCodeMaxSize, 512*M);
2964 }
2965
2966 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2967 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2968 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2969
2970 return JNI_OK;
2971 }
2972
2973 // Helper class for controlling the lifetime of JavaVMInitArgs
2974 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2975 // deleted on the destruction of the ScopedVMInitArgs object.
2976 class ScopedVMInitArgs : public StackObj {
2977 private:
2978 JavaVMInitArgs _args;
2979 char* _container_name;
2980 bool _is_set;
2981 char* _vm_options_file_arg;
2982
2983 public:
2984 ScopedVMInitArgs(const char *container_name) {
2985 _args.version = JNI_VERSION_1_2;
2986 _args.nOptions = 0;
2987 _args.options = nullptr;
2988 _args.ignoreUnrecognized = false;
2989 _container_name = (char *)container_name;
2990 _is_set = false;
2991 _vm_options_file_arg = nullptr;
2992 }
2993
2994 // Populates the JavaVMInitArgs object represented by this
2995 // ScopedVMInitArgs object with the arguments in options. The
2996 // allocated memory is deleted by the destructor. If this method
2997 // returns anything other than JNI_OK, then this object is in a
2998 // partially constructed state, and should be abandoned.
2999 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3000 _is_set = true;
3001 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3002 JavaVMOption, options->length(), mtArguments);
3003 if (options_arr == nullptr) {
3004 return JNI_ENOMEM;
3005 }
3006 _args.options = options_arr;
3007
3008 for (int i = 0; i < options->length(); i++) {
3009 options_arr[i] = options->at(i);
3010 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3011 if (options_arr[i].optionString == nullptr) {
3012 // Rely on the destructor to do cleanup.
3013 _args.nOptions = i;
3014 return JNI_ENOMEM;
3015 }
3016 }
3017
3018 _args.nOptions = options->length();
3019 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3020 return JNI_OK;
3021 }
3022
3023 JavaVMInitArgs* get() { return &_args; }
3024 char* container_name() { return _container_name; }
3025 bool is_set() { return _is_set; }
3026 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3027 char* vm_options_file_arg() { return _vm_options_file_arg; }
3028
3029 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3030 if (_vm_options_file_arg != nullptr) {
3031 os::free(_vm_options_file_arg);
3032 }
3033 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3034 }
3035
3036 ~ScopedVMInitArgs() {
3037 if (_vm_options_file_arg != nullptr) {
3038 os::free(_vm_options_file_arg);
3039 }
3040 if (_args.options == nullptr) return;
3041 for (int i = 0; i < _args.nOptions; i++) {
3042 os::free(_args.options[i].optionString);
3043 }
3044 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3045 }
3046
3047 // Insert options into this option list, to replace option at
3048 // vm_options_file_pos (-XX:VMOptionsFile)
3049 jint insert(const JavaVMInitArgs* args,
3050 const JavaVMInitArgs* args_to_insert,
3051 const int vm_options_file_pos) {
3052 assert(_args.options == nullptr, "shouldn't be set yet");
3053 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3054 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3055
3056 int length = args->nOptions + args_to_insert->nOptions - 1;
3057 // Construct new option array
3058 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3059 for (int i = 0; i < args->nOptions; i++) {
3060 if (i == vm_options_file_pos) {
3061 // insert the new options starting at the same place as the
3062 // -XX:VMOptionsFile option
3063 for (int j = 0; j < args_to_insert->nOptions; j++) {
3064 options.push(args_to_insert->options[j]);
3065 }
3066 } else {
3067 options.push(args->options[i]);
3068 }
3069 }
3070 // make into options array
3071 return set_args(&options);
3072 }
3073 };
3074
3075 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3076 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3077 }
3078
3079 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3080 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3081 }
3082
3083 jint Arguments::parse_options_environment_variable(const char* name,
3084 ScopedVMInitArgs* vm_args) {
3085 char *buffer = ::getenv(name);
3086
3087 // Don't check this environment variable if user has special privileges
3088 // (e.g. unix su command).
3089 if (buffer == nullptr || os::have_special_privileges()) {
3090 return JNI_OK;
3091 }
3092
3093 if ((buffer = os::strdup(buffer)) == nullptr) {
3094 return JNI_ENOMEM;
3095 }
3096
3097 jio_fprintf(defaultStream::error_stream(),
3098 "Picked up %s: %s\n", name, buffer);
3099
3100 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3101
3102 os::free(buffer);
3103 return retcode;
3104 }
3105
3106 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3107 // read file into buffer
3108 int fd = ::open(file_name, O_RDONLY);
3109 if (fd < 0) {
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Could not open options file '%s'\n",
3112 file_name);
3113 return JNI_ERR;
3114 }
3115
3116 struct stat stbuf;
3117 int retcode = os::stat(file_name, &stbuf);
3118 if (retcode != 0) {
3119 jio_fprintf(defaultStream::error_stream(),
3120 "Could not stat options file '%s'\n",
3121 file_name);
3122 ::close(fd);
3123 return JNI_ERR;
3124 }
3125
3126 if (stbuf.st_size == 0) {
3127 // tell caller there is no option data and that is ok
3128 ::close(fd);
3129 return JNI_OK;
3130 }
3131
3132 // '+ 1' for null termination even with max bytes
3133 size_t bytes_alloc = stbuf.st_size + 1;
3134
3135 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3136 if (nullptr == buf) {
3137 jio_fprintf(defaultStream::error_stream(),
3138 "Could not allocate read buffer for options file parse\n");
3139 ::close(fd);
3140 return JNI_ENOMEM;
3141 }
3142
3143 memset(buf, 0, bytes_alloc);
3144
3145 // Fill buffer
3146 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3147 ::close(fd);
3148 if (bytes_read < 0) {
3149 FREE_C_HEAP_ARRAY(char, buf);
3150 jio_fprintf(defaultStream::error_stream(),
3151 "Could not read options file '%s'\n", file_name);
3152 return JNI_ERR;
3153 }
3154
3155 if (bytes_read == 0) {
3156 // tell caller there is no option data and that is ok
3157 FREE_C_HEAP_ARRAY(char, buf);
3158 return JNI_OK;
3159 }
3160
3161 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3162
3163 FREE_C_HEAP_ARRAY(char, buf);
3164 return retcode;
3165 }
3166
3167 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3168 // Construct option array
3169 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3170
3171 // some pointers to help with parsing
3172 char *buffer_end = buffer + buf_len;
3173 char *opt_hd = buffer;
3174 char *wrt = buffer;
3175 char *rd = buffer;
3176
3177 // parse all options
3178 while (rd < buffer_end) {
3179 // skip leading white space from the input string
3180 while (rd < buffer_end && isspace(*rd)) {
3181 rd++;
3182 }
3183
3184 if (rd >= buffer_end) {
3185 break;
3186 }
3187
3188 // Remember this is where we found the head of the token.
3189 opt_hd = wrt;
3190
3191 // Tokens are strings of non white space characters separated
3192 // by one or more white spaces.
3193 while (rd < buffer_end && !isspace(*rd)) {
3194 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3195 int quote = *rd; // matching quote to look for
3196 rd++; // don't copy open quote
3197 while (rd < buffer_end && *rd != quote) {
3198 // include everything (even spaces)
3199 // up until the close quote
3200 *wrt++ = *rd++; // copy to option string
3201 }
3202
3203 if (rd < buffer_end) {
3204 rd++; // don't copy close quote
3205 } else {
3206 // did not see closing quote
3207 jio_fprintf(defaultStream::error_stream(),
3208 "Unmatched quote in %s\n", name);
3209 return JNI_ERR;
3210 }
3211 } else {
3212 *wrt++ = *rd++; // copy to option string
3213 }
3214 }
3215
3216 // steal a white space character and set it to null
3217 *wrt++ = '\0';
3218 // We now have a complete token
3219
3220 JavaVMOption option;
3221 option.optionString = opt_hd;
3222 option.extraInfo = nullptr;
3223
3224 options.append(option); // Fill in option
3225
3226 rd++; // Advance to next character
3227 }
3228
3229 // Fill out JavaVMInitArgs structure.
3230 return vm_args->set_args(&options);
3231 }
3232
3233 #ifndef PRODUCT
3234 // Determine whether LogVMOutput should be implicitly turned on.
3235 static bool use_vm_log() {
3236 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3237 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3238 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3239 PrintAssembly || TraceDeoptimization ||
3240 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3241 return true;
3242 }
3243
3244 #ifdef COMPILER1
3245 if (PrintC1Statistics) {
3246 return true;
3247 }
3248 #endif // COMPILER1
3249
3250 #ifdef COMPILER2
3251 if (PrintOptoAssembly || PrintOptoStatistics) {
3252 return true;
3253 }
3254 #endif // COMPILER2
3255
3256 return false;
3257 }
3258
3259 #endif // PRODUCT
3260
3261 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3262 for (int index = 0; index < args->nOptions; index++) {
3263 const JavaVMOption* option = args->options + index;
3264 const char* tail;
3265 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3266 return true;
3267 }
3268 }
3269 return false;
3270 }
3271
3272 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3273 const char* vm_options_file,
3274 const int vm_options_file_pos,
3275 ScopedVMInitArgs* vm_options_file_args,
3276 ScopedVMInitArgs* args_out) {
3277 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3278 if (code != JNI_OK) {
3279 return code;
3280 }
3281
3282 if (vm_options_file_args->get()->nOptions < 1) {
3283 return JNI_OK;
3284 }
3285
3286 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3287 jio_fprintf(defaultStream::error_stream(),
3288 "A VM options file may not refer to a VM options file. "
3289 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3290 "options file '%s' in options container '%s' is an error.\n",
3291 vm_options_file_args->vm_options_file_arg(),
3292 vm_options_file_args->container_name());
3293 return JNI_EINVAL;
3294 }
3295
3296 return args_out->insert(args, vm_options_file_args->get(),
3297 vm_options_file_pos);
3298 }
3299
3300 // Expand -XX:VMOptionsFile found in args_in as needed.
3301 // mod_args and args_out parameters may return values as needed.
3302 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3303 ScopedVMInitArgs* mod_args,
3304 JavaVMInitArgs** args_out) {
3305 jint code = match_special_option_and_act(args_in, mod_args);
3306 if (code != JNI_OK) {
3307 return code;
3308 }
3309
3310 if (mod_args->is_set()) {
3311 // args_in contains -XX:VMOptionsFile and mod_args contains the
3312 // original options from args_in along with the options expanded
3313 // from the VMOptionsFile. Return a short-hand to the caller.
3314 *args_out = mod_args->get();
3315 } else {
3316 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3317 }
3318 return JNI_OK;
3319 }
3320
3321 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3322 ScopedVMInitArgs* args_out) {
3323 // Remaining part of option string
3324 const char* tail;
3325 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3326
3327 for (int index = 0; index < args->nOptions; index++) {
3328 const JavaVMOption* option = args->options + index;
3329 if (match_option(option, "-XX:Flags=", &tail)) {
3330 Arguments::set_jvm_flags_file(tail);
3331 continue;
3332 }
3333 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3334 if (vm_options_file_args.found_vm_options_file_arg()) {
3335 jio_fprintf(defaultStream::error_stream(),
3336 "The option '%s' is already specified in the options "
3337 "container '%s' so the specification of '%s' in the "
3338 "same options container is an error.\n",
3339 vm_options_file_args.vm_options_file_arg(),
3340 vm_options_file_args.container_name(),
3341 option->optionString);
3342 return JNI_EINVAL;
3343 }
3344 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3345 // If there's a VMOptionsFile, parse that
3346 jint code = insert_vm_options_file(args, tail, index,
3347 &vm_options_file_args, args_out);
3348 if (code != JNI_OK) {
3349 return code;
3350 }
3351 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3352 if (args_out->is_set()) {
3353 // The VMOptions file inserted some options so switch 'args'
3354 // to the new set of options, and continue processing which
3355 // preserves "last option wins" semantics.
3356 args = args_out->get();
3357 // The first option from the VMOptionsFile replaces the
3358 // current option. So we back track to process the
3359 // replacement option.
3360 index--;
3361 }
3362 continue;
3363 }
3364 if (match_option(option, "-XX:+PrintVMOptions")) {
3365 PrintVMOptions = true;
3366 continue;
3367 }
3368 if (match_option(option, "-XX:-PrintVMOptions")) {
3369 PrintVMOptions = false;
3370 continue;
3371 }
3372 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3373 IgnoreUnrecognizedVMOptions = true;
3374 continue;
3375 }
3376 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3377 IgnoreUnrecognizedVMOptions = false;
3378 continue;
3379 }
3380 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3381 JVMFlag::printFlags(tty, false);
3382 vm_exit(0);
3383 }
3384
3385 #ifndef PRODUCT
3386 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3387 JVMFlag::printFlags(tty, true);
3388 vm_exit(0);
3389 }
3390 #endif
3391 }
3392 return JNI_OK;
3393 }
3394
3395 static void print_options(const JavaVMInitArgs *args) {
3396 const char* tail;
3397 for (int index = 0; index < args->nOptions; index++) {
3398 const JavaVMOption *option = args->options + index;
3399 if (match_option(option, "-XX:", &tail)) {
3400 logOption(tail);
3401 }
3402 }
3403 }
3404
3405 bool Arguments::handle_deprecated_print_gc_flags() {
3406 if (PrintGC) {
3407 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3408 }
3409 if (PrintGCDetails) {
3410 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3411 }
3412
3413 if (_legacyGCLogging.lastFlag == 2) {
3414 // -Xloggc was used to specify a filename
3415 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3416
3417 LogTarget(Error, logging) target;
3418 LogStream errstream(target);
3419 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3420 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3421 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3422 }
3423 return true;
3424 }
3425
3426 static void apply_debugger_ergo() {
3427 #ifdef ASSERT
3428 if (ReplayCompiles) {
3429 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3430 }
3431
3432 if (UseDebuggerErgo) {
3433 // Turn on sub-flags
3434 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3435 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3436 }
3437
3438 if (UseDebuggerErgo2) {
3439 // Debugging with limited number of CPUs
3440 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3441 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3442 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3443 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3444 }
3445 #endif // ASSERT
3446 }
3447
3448 // Parse entry point called from JNI_CreateJavaVM
3449
3450 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3451 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3452 JVMFlag::check_all_flag_declarations();
3453
3454 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3455 const char* hotspotrc = ".hotspotrc";
3456 bool settings_file_specified = false;
3457 bool needs_hotspotrc_warning = false;
3458 ScopedVMInitArgs initial_vm_options_args("");
3459 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3460 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3461
3462 // Pointers to current working set of containers
3463 JavaVMInitArgs* cur_cmd_args;
3464 JavaVMInitArgs* cur_vm_options_args;
3465 JavaVMInitArgs* cur_java_options_args;
3466 JavaVMInitArgs* cur_java_tool_options_args;
3467
3468 // Containers for modified/expanded options
3469 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3470 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3471 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3472 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3473
3474
3475 jint code =
3476 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3477 if (code != JNI_OK) {
3478 return code;
3479 }
3480
3481 code = parse_java_options_environment_variable(&initial_java_options_args);
3482 if (code != JNI_OK) {
3483 return code;
3484 }
3485
3486 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3487 char *vmoptions = ClassLoader::lookup_vm_options();
3488 if (vmoptions != nullptr) {
3489 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3490 FREE_C_HEAP_ARRAY(char, vmoptions);
3491 if (code != JNI_OK) {
3492 return code;
3493 }
3494 }
3495
3496 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3497 &mod_java_tool_options_args,
3498 &cur_java_tool_options_args);
3499 if (code != JNI_OK) {
3500 return code;
3501 }
3502
3503 code = expand_vm_options_as_needed(initial_cmd_args,
3504 &mod_cmd_args,
3505 &cur_cmd_args);
3506 if (code != JNI_OK) {
3507 return code;
3508 }
3509
3510 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3511 &mod_java_options_args,
3512 &cur_java_options_args);
3513 if (code != JNI_OK) {
3514 return code;
3515 }
3516
3517 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3518 &mod_vm_options_args,
3519 &cur_vm_options_args);
3520 if (code != JNI_OK) {
3521 return code;
3522 }
3523
3524 const char* flags_file = Arguments::get_jvm_flags_file();
3525 settings_file_specified = (flags_file != nullptr);
3526
3527 if (IgnoreUnrecognizedVMOptions) {
3528 cur_cmd_args->ignoreUnrecognized = true;
3529 cur_java_tool_options_args->ignoreUnrecognized = true;
3530 cur_java_options_args->ignoreUnrecognized = true;
3531 }
3532
3533 // Parse specified settings file
3534 if (settings_file_specified) {
3535 if (!process_settings_file(flags_file, true,
3536 cur_cmd_args->ignoreUnrecognized)) {
3537 return JNI_EINVAL;
3538 }
3539 } else {
3540 #ifdef ASSERT
3541 // Parse default .hotspotrc settings file
3542 if (!process_settings_file(".hotspotrc", false,
3543 cur_cmd_args->ignoreUnrecognized)) {
3544 return JNI_EINVAL;
3545 }
3546 #else
3547 struct stat buf;
3548 if (os::stat(hotspotrc, &buf) == 0) {
3549 needs_hotspotrc_warning = true;
3550 }
3551 #endif
3552 }
3553
3554 if (PrintVMOptions) {
3555 print_options(cur_java_tool_options_args);
3556 print_options(cur_cmd_args);
3557 print_options(cur_java_options_args);
3558 }
3559
3560 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3561 jint result = parse_vm_init_args(cur_vm_options_args,
3562 cur_java_tool_options_args,
3563 cur_java_options_args,
3564 cur_cmd_args);
3565
3566 if (result != JNI_OK) {
3567 return result;
3568 }
3569
3570 // Delay warning until here so that we've had a chance to process
3571 // the -XX:-PrintWarnings flag
3572 if (needs_hotspotrc_warning) {
3573 warning("%s file is present but has been ignored. "
3574 "Run with -XX:Flags=%s to load the file.",
3575 hotspotrc, hotspotrc);
3576 }
3577
3578 if (needs_module_property_warning) {
3579 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3580 " names that are reserved for internal use.");
3581 }
3582
3583 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3584 UNSUPPORTED_OPTION(UseLargePages);
3585 #endif
3586
3587 #if defined(AIX)
3588 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3589 #endif
3590
3591 #ifndef PRODUCT
3592 if (TraceBytecodesAt != 0) {
3593 TraceBytecodes = true;
3594 }
3595 #endif // PRODUCT
3596
3597 if (ScavengeRootsInCode == 0) {
3598 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3599 warning("Forcing ScavengeRootsInCode non-zero");
3600 }
3601 ScavengeRootsInCode = 1;
3602 }
3603
3604 if (!handle_deprecated_print_gc_flags()) {
3605 return JNI_EINVAL;
3606 }
3607
3608 // Set object alignment values.
3609 set_object_alignment();
3610
3611 #if !INCLUDE_CDS
3612 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3613 jio_fprintf(defaultStream::error_stream(),
3614 "Shared spaces are not supported in this VM\n");
3615 return JNI_ERR;
3616 }
3617 if (DumpLoadedClassList != nullptr) {
3618 jio_fprintf(defaultStream::error_stream(),
3619 "DumpLoadedClassList is not supported in this VM\n");
3620 return JNI_ERR;
3621 }
3622 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
3623 log_is_enabled(Info, cds)) {
3624 warning("Shared spaces are not supported in this VM");
3625 UseSharedSpaces = false;
3626 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3627 }
3628 no_shared_spaces("CDS Disabled");
3629 #endif // INCLUDE_CDS
3630
3631 // Verify NMT arguments
3632 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3633 if (lvl == NMT_unknown) {
3634 jio_fprintf(defaultStream::error_stream(),
3635 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3636 return JNI_ERR;
3637 }
3638 if (PrintNMTStatistics && lvl == NMT_off) {
3639 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3640 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3641 }
3642
3643 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3644 if (trace_dependencies && VerifyDependencies) {
3645 warning("dependency logging results may be inflated by VerifyDependencies");
3646 }
3647
3648 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3649 log_is_enabled(Info, class, load, cause);
3650 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3651 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3652 }
3653
3654 apply_debugger_ergo();
3655
3656 // The VMThread needs to stop now and then to execute these debug options.
3657 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3658 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3659 }
3660
3661 if (log_is_enabled(Info, arguments)) {
3662 LogStream st(Log(arguments)::info());
3663 Arguments::print_on(&st);
3664 }
3665
3666 return JNI_OK;
3667 }
3668
3669 jint Arguments::apply_ergo() {
3670 // Set flags based on ergonomics.
3671 jint result = set_ergonomics_flags();
3672 if (result != JNI_OK) return result;
3673
3674 // Set heap size based on available physical memory
3675 set_heap_size();
3676
3677 GCConfig::arguments()->initialize();
3678
3679 CDSConfig::initialize();
3680
3681 // Initialize Metaspace flags and alignments
3682 Metaspace::ergo_initialize();
3683
3684 if (!StringDedup::ergo_initialize()) {
3685 return JNI_EINVAL;
3686 }
3687
3688 // Set compiler flags after GC is selected and GC specific
3689 // flags (LoopStripMiningIter) are set.
3690 CompilerConfig::ergo_initialize();
3691
3692 // Set bytecode rewriting flags
3693 set_bytecode_flags();
3694
3695 // Set flags if aggressive optimization flags are enabled
3696 jint code = set_aggressive_opts_flags();
3697 if (code != JNI_OK) {
3698 return code;
3699 }
3700
3701 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3702 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3703 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3704 warning("UseSecondarySupersTable is not supported");
3705 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3706 }
3707 UseSecondarySupersTable = false; // FIXME: Disabled for Leyden. Neet to fix SCAddressTable::id_for_address()
3708 if (!UseSecondarySupersTable) {
3709 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3710 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3711 }
3712
3713 #ifdef ZERO
3714 // Clear flags not supported on zero.
3715 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3716 #endif // ZERO
3717
3718 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3719 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3720 DebugNonSafepoints = true;
3721 }
3722
3723 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3724 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3725 }
3726
3727 // Treat the odd case where local verification is enabled but remote
3728 // verification is not as if both were enabled.
3729 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3730 log_info(verification)("Turning on remote verification because local verification is on");
3731 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3732 }
3733
3734 #ifndef PRODUCT
3735 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3736 if (use_vm_log()) {
3737 LogVMOutput = true;
3738 }
3739 }
3740 #endif // PRODUCT
3741
3742 if (PrintCommandLineFlags) {
3743 JVMFlag::printSetFlags(tty);
3744 }
3745
3746 #if COMPILER2_OR_JVMCI
3747 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3748 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3749 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3750 }
3751 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3752
3753 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3754 if (!EnableVectorReboxing) {
3755 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3756 } else {
3757 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3758 }
3759 }
3760 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3761
3762 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3763 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3764 }
3765 FLAG_SET_DEFAULT(UseVectorStubs, false);
3766 }
3767 #endif // COMPILER2_OR_JVMCI
3768
3769 if (log_is_enabled(Info, init)) {
3770 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3771 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3772 }
3773 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3774 } else {
3775 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3776 warning("Disabling ProfileVMLocks since logging is turned off.");
3777 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3778 }
3779 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3780 warning("Disabling ProfileVMCalls since logging is turned off.");
3781 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3782 }
3783 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3784 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3785 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3786 }
3787 }
3788 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3789 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3790 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3791 }
3792 }
3793
3794 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3795 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3796 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3797 }
3798 }
3799 return JNI_OK;
3800 }
3801
3802 jint Arguments::adjust_after_os() {
3803 if (UseNUMA) {
3804 if (UseParallelGC) {
3805 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3806 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3807 }
3808 }
3809 }
3810 return JNI_OK;
3811 }
3812
3813 int Arguments::PropertyList_count(SystemProperty* pl) {
3814 int count = 0;
3815 while(pl != nullptr) {
3816 count++;
3817 pl = pl->next();
3818 }
3819 return count;
3820 }
3821
3822 // Return the number of readable properties.
3823 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3824 int count = 0;
3825 while(pl != nullptr) {
3826 if (pl->readable()) {
3827 count++;
3828 }
3829 pl = pl->next();
3830 }
3831 return count;
3832 }
3833
3834 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3835 assert(key != nullptr, "just checking");
3836 SystemProperty* prop;
3837 for (prop = pl; prop != nullptr; prop = prop->next()) {
3838 if (strcmp(key, prop->key()) == 0) return prop->value();
3839 }
3840 return nullptr;
3841 }
3842
3843 // Return the value of the requested property provided that it is a readable property.
3844 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3845 assert(key != nullptr, "just checking");
3846 SystemProperty* prop;
3847 // Return the property value if the keys match and the property is not internal or
3848 // it's the special internal property "jdk.boot.class.path.append".
3849 for (prop = pl; prop != nullptr; prop = prop->next()) {
3850 if (strcmp(key, prop->key()) == 0) {
3851 if (!prop->internal()) {
3852 return prop->value();
3853 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3854 return prop->value();
3855 } else {
3856 // Property is internal and not jdk.boot.class.path.append so return null.
3857 return nullptr;
3858 }
3859 }
3860 }
3861 return nullptr;
3862 }
3863
3864 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3865 SystemProperty* p = *plist;
3866 if (p == nullptr) {
3867 *plist = new_p;
3868 } else {
3869 while (p->next() != nullptr) {
3870 p = p->next();
3871 }
3872 p->set_next(new_p);
3873 }
3874 }
3875
3876 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3877 bool writeable, bool internal) {
3878 if (plist == nullptr)
3879 return;
3880
3881 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3882 PropertyList_add(plist, new_p);
3883 }
3884
3885 void Arguments::PropertyList_add(SystemProperty *element) {
3886 PropertyList_add(&_system_properties, element);
3887 }
3888
3889 // This add maintains unique property key in the list.
3890 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3891 PropertyAppendable append, PropertyWriteable writeable,
3892 PropertyInternal internal) {
3893 if (plist == nullptr)
3894 return;
3895
3896 // If property key exists and is writeable, then update with new value.
3897 // Trying to update a non-writeable property is silently ignored.
3898 SystemProperty* prop;
3899 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3900 if (strcmp(k, prop->key()) == 0) {
3901 if (append == AppendProperty) {
3902 prop->append_writeable_value(v);
3903 } else {
3904 prop->set_writeable_value(v);
3905 }
3906 return;
3907 }
3908 }
3909
3910 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3911 }
3912
3913 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3914 // Returns true if all of the source pointed by src has been copied over to
3915 // the destination buffer pointed by buf. Otherwise, returns false.
3916 // Notes:
3917 // 1. If the length (buflen) of the destination buffer excluding the
3918 // null terminator character is not long enough for holding the expanded
3919 // pid characters, it also returns false instead of returning the partially
3920 // expanded one.
3921 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3922 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3923 char* buf, size_t buflen) {
3924 const char* p = src;
3925 char* b = buf;
3926 const char* src_end = &src[srclen];
3927 char* buf_end = &buf[buflen - 1];
3928
3929 while (p < src_end && b < buf_end) {
3930 if (*p == '%') {
3931 switch (*(++p)) {
3932 case '%': // "%%" ==> "%"
3933 *b++ = *p++;
3934 break;
3935 case 'p': { // "%p" ==> current process id
3936 // buf_end points to the character before the last character so
3937 // that we could write '\0' to the end of the buffer.
3938 size_t buf_sz = buf_end - b + 1;
3939 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3940
3941 // if jio_snprintf fails or the buffer is not long enough to hold
3942 // the expanded pid, returns false.
3943 if (ret < 0 || ret >= (int)buf_sz) {
3944 return false;
3945 } else {
3946 b += ret;
3947 assert(*b == '\0', "fail in copy_expand_pid");
3948 if (p == src_end && b == buf_end + 1) {
3949 // reach the end of the buffer.
3950 return true;
3951 }
3952 }
3953 p++;
3954 break;
3955 }
3956 default :
3957 *b++ = '%';
3958 }
3959 } else {
3960 *b++ = *p++;
3961 }
3962 }
3963 *b = '\0';
3964 return (p == src_end); // return false if not all of the source was copied
3965 }