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/genArguments.hpp"
39 #include "gc/shared/stringdedup/stringDedup.hpp"
40 #include "gc/shared/tlab_globals.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logConfiguration.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "nmt/nmtCommon.hpp"
48 #include "oops/compressedKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/objLayout.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "prims/jvmtiAgentList.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/flags/jvmFlag.hpp"
56 #include "runtime/flags/jvmFlagAccess.hpp"
57 #include "runtime/flags/jvmFlagLimit.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/os.hpp"
61 #include "runtime/safepoint.hpp"
62 #include "runtime/safepointMechanism.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/management.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/checkedCast.hpp"
68 #include "utilities/debug.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/macros.hpp"
71 #include "utilities/parseInteger.hpp"
72 #include "utilities/powerOfTwo.hpp"
73 #include "utilities/stringUtils.hpp"
74 #include "utilities/systemMemoryBarrier.hpp"
75 #if INCLUDE_JFR
76 #include "jfr/jfr.hpp"
77 #endif
78
79 #include <limits>
80
81 static const char _default_java_launcher[] = "generic";
82
83 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
84
85 char* Arguments::_jvm_flags_file = nullptr;
86 char** Arguments::_jvm_flags_array = nullptr;
87 int Arguments::_num_jvm_flags = 0;
88 char** Arguments::_jvm_args_array = nullptr;
89 int Arguments::_num_jvm_args = 0;
90 unsigned int Arguments::_addmods_count = 0;
91 char* Arguments::_java_command = nullptr;
92 SystemProperty* Arguments::_system_properties = nullptr;
93 size_t Arguments::_conservative_max_heap_alignment = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 const char* Arguments::_java_vendor_url_bug = nullptr;
96 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
97 bool Arguments::_sun_java_launcher_is_altjvm = false;
98
99 // These parameters are reset in method parse_vm_init_args()
100 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
101 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
102 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
103 bool Arguments::_ClipInlining = ClipInlining;
104 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
105
106 bool Arguments::_enable_preview = false;
107
108 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
109
110 // These are not set by the JDK's built-in launchers, but they can be set by
111 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
112 // JavaVMOption in jni.h.
113 abort_hook_t Arguments::_abort_hook = nullptr;
114 exit_hook_t Arguments::_exit_hook = nullptr;
115 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
116
117
118 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
119 SystemProperty *Arguments::_java_library_path = nullptr;
120 SystemProperty *Arguments::_java_home = nullptr;
121 SystemProperty *Arguments::_java_class_path = nullptr;
122 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
123 SystemProperty *Arguments::_vm_info = nullptr;
124
125 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
126 PathString *Arguments::_boot_class_path = nullptr;
127 bool Arguments::_has_jimage = false;
128
129 char* Arguments::_ext_dirs = nullptr;
130
131 // True if -Xshare:auto option was specified.
132 static bool xshare_auto_cmd_line = false;
133
134 // True if -Xint/-Xmixed/-Xcomp were specified
135 static bool mode_flag_cmd_line = false;
136
137 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
138 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
139 if (new_value == nullptr) {
140 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
141 return false;
142 }
143 if (_value != nullptr) {
144 FreeHeap(_value);
145 }
146 _value = new_value;
147 strcpy(_value, value);
148 return true;
149 }
150
151 void PathString::append_value(const char *value) {
152 char *sp;
153 size_t len = 0;
154 if (value != nullptr) {
155 len = strlen(value);
156 if (_value != nullptr) {
157 len += strlen(_value);
158 }
159 sp = AllocateHeap(len+2, mtArguments);
160 assert(sp != nullptr, "Unable to allocate space for new append path value");
161 if (sp != nullptr) {
162 if (_value != nullptr) {
163 strcpy(sp, _value);
164 strcat(sp, os::path_separator());
165 strcat(sp, value);
166 FreeHeap(_value);
167 } else {
168 strcpy(sp, value);
169 }
170 _value = sp;
171 }
172 }
173 }
174
175 PathString::PathString(const char* value) {
176 if (value == nullptr) {
177 _value = nullptr;
178 } else {
179 _value = AllocateHeap(strlen(value)+1, mtArguments);
180 strcpy(_value, value);
181 }
182 }
183
184 PathString::~PathString() {
185 if (_value != nullptr) {
186 FreeHeap(_value);
187 _value = nullptr;
188 }
189 }
190
191 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
192 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
193 size_t len = strlen(module_name) + 1;
194 _module_name = AllocateHeap(len, mtInternal);
195 strncpy(_module_name, module_name, len); // copy the trailing null
196 _path = new PathString(path);
197 }
198
199 ModulePatchPath::~ModulePatchPath() {
200 if (_module_name != nullptr) {
201 FreeHeap(_module_name);
202 _module_name = nullptr;
203 }
204 if (_path != nullptr) {
205 delete _path;
206 _path = nullptr;
207 }
208 }
209
210 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
211 if (key == nullptr) {
212 _key = nullptr;
213 } else {
214 _key = AllocateHeap(strlen(key)+1, mtArguments);
215 strcpy(_key, key);
216 }
217 _next = nullptr;
218 _internal = internal;
219 _writeable = writeable;
220 }
221
222 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
223 // part of the option string.
224 static bool match_option(const JavaVMOption *option, const char* name,
225 const char** tail) {
226 size_t len = strlen(name);
227 if (strncmp(option->optionString, name, len) == 0) {
228 *tail = option->optionString + len;
229 return true;
230 } else {
231 return false;
232 }
233 }
234
235 // Check if 'option' matches 'name'. No "tail" is allowed.
236 static bool match_option(const JavaVMOption *option, const char* name) {
237 const char* tail = nullptr;
238 bool result = match_option(option, name, &tail);
239 if (tail != nullptr && *tail == '\0') {
240 return result;
241 } else {
242 return false;
243 }
244 }
245
246 // Return true if any of the strings in null-terminated array 'names' matches.
247 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
248 // the option must match exactly.
249 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
250 bool tail_allowed) {
251 for (/* empty */; *names != nullptr; ++names) {
252 if (match_option(option, *names, tail)) {
253 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
254 return true;
255 }
256 }
257 }
258 return false;
259 }
260
261 #if INCLUDE_JFR
262 static bool _has_jfr_option = false; // is using JFR
263
264 // return true on failure
265 static bool match_jfr_option(const JavaVMOption** option) {
266 assert((*option)->optionString != nullptr, "invariant");
267 char* tail = nullptr;
268 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_start_flight_recording_option(option, tail);
271 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
272 _has_jfr_option = true;
273 return Jfr::on_flight_recorder_option(option, tail);
274 }
275 return false;
276 }
277
278 bool Arguments::has_jfr_option() {
279 return _has_jfr_option;
280 }
281 #endif
282
283 static void logOption(const char* opt) {
284 if (PrintVMOptions) {
285 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
286 }
287 }
288
289 bool needs_module_property_warning = false;
290
291 #define MODULE_PROPERTY_PREFIX "jdk.module."
292 #define MODULE_PROPERTY_PREFIX_LEN 11
293 #define ADDEXPORTS "addexports"
294 #define ADDEXPORTS_LEN 10
295 #define ADDREADS "addreads"
296 #define ADDREADS_LEN 8
297 #define ADDOPENS "addopens"
298 #define ADDOPENS_LEN 8
299 #define PATCH "patch"
300 #define PATCH_LEN 5
301 #define ADDMODS "addmods"
302 #define ADDMODS_LEN 7
303 #define LIMITMODS "limitmods"
304 #define LIMITMODS_LEN 9
305 #define PATH "path"
306 #define PATH_LEN 4
307 #define UPGRADE_PATH "upgrade.path"
308 #define UPGRADE_PATH_LEN 12
309 #define ENABLE_NATIVE_ACCESS "enable.native.access"
310 #define ENABLE_NATIVE_ACCESS_LEN 20
311 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
312 #define ILLEGAL_NATIVE_ACCESS_LEN 21
313
314 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
315 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
316 return ((strncmp(option, property, len) == 0) &&
317 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
318 }
319
320 // Return true if property starts with "jdk.module." and its ensuing chars match
321 // any of the reserved module properties.
322 // property should be passed without the leading "-D".
323 bool Arguments::is_internal_module_property(const char* property) {
324 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
325 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
326 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
327 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
328 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
329 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
330 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
331 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
332 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
333 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
334 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
335 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
336 return true;
337 }
338 }
339 return false;
340 }
341
342 bool Arguments::is_add_modules_property(const char* key) {
343 return (strcmp(key, MODULE_PROPERTY_PREFIX ADDMODS) == 0);
344 }
345
346 // Return true if the key matches the --module-path property name ("jdk.module.path").
347 bool Arguments::is_module_path_property(const char* key) {
348 return (strcmp(key, MODULE_PROPERTY_PREFIX PATH) == 0);
349 }
350
351 // Process java launcher properties.
352 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
353 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
354 // Must do this before setting up other system properties,
355 // as some of them may depend on launcher type.
356 for (int index = 0; index < args->nOptions; index++) {
357 const JavaVMOption* option = args->options + index;
358 const char* tail;
359
360 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
361 process_java_launcher_argument(tail, option->extraInfo);
362 continue;
363 }
364 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
365 if (strcmp(tail, "true") == 0) {
366 _sun_java_launcher_is_altjvm = true;
367 }
368 continue;
369 }
370 }
371 }
372
373 // Initialize system properties key and value.
374 void Arguments::init_system_properties() {
375
376 // Set up _boot_class_path which is not a property but
377 // relies heavily on argument processing and the jdk.boot.class.path.append
378 // property. It is used to store the underlying boot class path.
379 _boot_class_path = new PathString(nullptr);
380
381 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
382 "Java Virtual Machine Specification", false));
383 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
384 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
385 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
386
387 // Initialize the vm.info now, but it will need updating after argument parsing.
388 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
389
390 // Following are JVMTI agent writable properties.
391 // Properties values are set to nullptr and they are
392 // os specific they are initialized in os::init_system_properties_values().
393 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
394 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
395 _java_home = new SystemProperty("java.home", nullptr, true);
396 _java_class_path = new SystemProperty("java.class.path", "", true);
397 // jdk.boot.class.path.append is a non-writeable, internal property.
398 // It can only be set by either:
399 // - -Xbootclasspath/a:
400 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
401 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
402
403 // Add to System Property list.
404 PropertyList_add(&_system_properties, _sun_boot_library_path);
405 PropertyList_add(&_system_properties, _java_library_path);
406 PropertyList_add(&_system_properties, _java_home);
407 PropertyList_add(&_system_properties, _java_class_path);
408 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
409 PropertyList_add(&_system_properties, _vm_info);
410
411 // Set OS specific system properties values
412 os::init_system_properties_values();
413 }
414
415 // Update/Initialize System properties after JDK version number is known
416 void Arguments::init_version_specific_system_properties() {
417 enum { bufsz = 16 };
418 char buffer[bufsz];
419 const char* spec_vendor = "Oracle Corporation";
420 uint32_t spec_version = JDK_Version::current().major_version();
421
422 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
423
424 PropertyList_add(&_system_properties,
425 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
426 PropertyList_add(&_system_properties,
427 new SystemProperty("java.vm.specification.version", buffer, false));
428 PropertyList_add(&_system_properties,
429 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
430 }
431
432 /*
433 * -XX argument processing:
434 *
435 * -XX arguments are defined in several places, such as:
436 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
437 * -XX arguments are parsed in parse_argument().
438 * -XX argument bounds checking is done in check_vm_args_consistency().
439 *
440 * Over time -XX arguments may change. There are mechanisms to handle common cases:
441 *
442 * ALIASED: An option that is simply another name for another option. This is often
443 * part of the process of deprecating a flag, but not all aliases need
444 * to be deprecated.
445 *
446 * Create an alias for an option by adding the old and new option names to the
447 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
448 *
449 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
450 * support may be removed in the future. Both regular and aliased options may be
451 * deprecated.
452 *
453 * Add a deprecation warning for an option (or alias) by adding an entry in the
454 * "special_jvm_flags" table and setting the "deprecated_in" field.
455 * Often an option "deprecated" in one major release will
456 * be made "obsolete" in the next. In this case the entry should also have its
457 * "obsolete_in" field set.
458 *
459 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
460 * on the command line. A warning is printed to let the user know that option might not
461 * be accepted in the future.
462 *
463 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
464 * table and setting the "obsolete_in" field.
465 *
466 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
467 * to the current JDK version. The system will flatly refuse to admit the existence of
468 * the flag. This allows a flag to die automatically over JDK releases.
469 *
470 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
471 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
472 * - Newly obsolete or expired deprecated options should have their global variable
473 * definitions removed (from globals.hpp, etc) and related implementations removed.
474 *
475 * Recommended approach for removing options:
476 *
477 * To remove options commonly used by customers (e.g. product -XX options), use
478 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
479 *
480 * To remove internal options (e.g. diagnostic, experimental, develop options), use
481 * a 2-step model adding major release numbers to the obsolete and expire columns.
482 *
483 * To change the name of an option, use the alias table as well as a 2-step
484 * model adding major release numbers to the deprecate and expire columns.
485 * Think twice about aliasing commonly used customer options.
486 *
487 * There are times when it is appropriate to leave a future release number as undefined.
488 *
489 * Tests: Aliases should be tested in VMAliasOptions.java.
490 * Deprecated options should be tested in VMDeprecatedOptions.java.
491 */
492
493 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
494 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
495 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
496 // the command-line as usual, but will issue a warning.
497 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
498 // the command-line, while issuing a warning and ignoring the flag value.
499 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
500 // existence of the flag.
501 //
502 // MANUAL CLEANUP ON JDK VERSION UPDATES:
503 // This table ensures that the handling of options will update automatically when the JDK
504 // version is incremented, but the source code needs to be cleanup up manually:
505 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
506 // variable should be removed, as well as users of the variable.
507 // - As "deprecated" options age into "obsolete" options, move the entry into the
508 // "Obsolete Flags" section of the table.
509 // - All expired options should be removed from the table.
510 static SpecialFlag const special_jvm_flags[] = {
511 // -------------- Deprecated Flags --------------
512 // --- Non-alias flags - sorted by obsolete_in then expired_in:
513 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
515 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
516 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
517 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
518 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
519 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
520 #ifdef LINUX
521 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
522 #endif
523 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
524 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
525 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
526
527 // -------------- Obsolete Flags - sorted by expired_in --------------
528
529 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
530 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
531 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
532 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
533 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
534 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
535 #if defined(X86)
536 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
537 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
538 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
539 #endif // X86
540
541
542 { "BaseFootPrintEstimate", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
543 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
544 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
545 #ifdef ASSERT
546 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
547 #endif
548
549 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
550 // These entries will generate build errors. Their purpose is to test the macros.
551 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
552 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
553 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
554 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
555 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
556 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
557 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
558 #endif
559
560 { nullptr, JDK_Version(0), JDK_Version(0) }
561 };
562
563 // Flags that are aliases for other flags.
564 typedef struct {
565 const char* alias_name;
566 const char* real_name;
567 } AliasedFlag;
568
569 static AliasedFlag const aliased_jvm_flags[] = {
570 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
571 { nullptr, nullptr}
572 };
573
574 // Return true if "v" is less than "other", where "other" may be "undefined".
575 static bool version_less_than(JDK_Version v, JDK_Version other) {
576 assert(!v.is_undefined(), "must be defined");
577 if (!other.is_undefined() && v.compare(other) >= 0) {
578 return false;
579 } else {
580 return true;
581 }
582 }
583
584 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
585 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
586 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
587 flag = special_jvm_flags[i];
588 return true;
589 }
590 }
591 return false;
592 }
593
594 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
595 assert(version != nullptr, "Must provide a version buffer");
596 SpecialFlag flag;
597 if (lookup_special_flag(flag_name, flag)) {
598 if (!flag.obsolete_in.is_undefined()) {
599 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
600 *version = flag.obsolete_in;
601 // This flag may have been marked for obsoletion in this version, but we may not
602 // have actually removed it yet. Rather than ignoring it as soon as we reach
603 // this version we allow some time for the removal to happen. So if the flag
604 // still actually exists we process it as normal, but issue an adjusted warning.
605 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
606 if (real_flag != nullptr) {
607 char version_str[256];
608 version->to_string(version_str, sizeof(version_str));
609 warning("Temporarily processing option %s; support is scheduled for removal in %s",
610 flag_name, version_str);
611 return false;
612 }
613 return true;
614 }
615 }
616 }
617 return false;
618 }
619
620 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
621 assert(version != nullptr, "Must provide a version buffer");
622 SpecialFlag flag;
623 if (lookup_special_flag(flag_name, flag)) {
624 if (!flag.deprecated_in.is_undefined()) {
625 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
626 version_less_than(JDK_Version::current(), flag.expired_in)) {
627 *version = flag.deprecated_in;
628 return 1;
629 } else {
630 return -1;
631 }
632 }
633 }
634 return 0;
635 }
636
637 const char* Arguments::real_flag_name(const char *flag_name) {
638 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
639 const AliasedFlag& flag_status = aliased_jvm_flags[i];
640 if (strcmp(flag_status.alias_name, flag_name) == 0) {
641 return flag_status.real_name;
642 }
643 }
644 return flag_name;
645 }
646
647 #ifdef ASSERT
648 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
649 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
650 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
651 return true;
652 }
653 }
654 return false;
655 }
656
657 // Verifies the correctness of the entries in the special_jvm_flags table.
658 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
659 // version being earlier than the deprecation version, then a warning is issued
660 // and verification fails - by returning false. If it is detected that the table
661 // is out of date, with respect to the current version, then ideally a warning is
662 // issued but verification does not fail. This allows the VM to operate when the
663 // version is first updated, without needing to update all the impacted flags at
664 // the same time. In practice we can't issue the warning immediately when the version
665 // is updated as it occurs for every test and some tests are not prepared to handle
666 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
667 // if the check_globals flag is true, and in addition allow a grace period and only
668 // check for stale flags when we hit build 25 (which is far enough into the 6 month
669 // release cycle that all flag updates should have been processed, whilst still
670 // leaving time to make the change before RDP2).
671 // We use a gtest to call this, passing true, so that we can detect stale flags before
672 // the end of the release cycle.
673
674 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
675
676 bool Arguments::verify_special_jvm_flags(bool check_globals) {
677 bool success = true;
678 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
679 const SpecialFlag& flag = special_jvm_flags[i];
680 if (lookup_special_flag(flag.name, i)) {
681 warning("Duplicate special flag declaration \"%s\"", flag.name);
682 success = false;
683 }
684 if (flag.deprecated_in.is_undefined() &&
685 flag.obsolete_in.is_undefined()) {
686 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
687 success = false;
688 }
689
690 if (!flag.deprecated_in.is_undefined()) {
691 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
692 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
693 success = false;
694 }
695
696 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
697 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
698 success = false;
699 }
700 }
701
702 if (!flag.obsolete_in.is_undefined()) {
703 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
704 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
705 success = false;
706 }
707
708 // if flag has become obsolete it should not have a "globals" flag defined anymore.
709 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
710 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
711 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
712 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
713 success = false;
714 }
715 }
716
717 } else if (!flag.expired_in.is_undefined()) {
718 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
719 success = false;
720 }
721
722 if (!flag.expired_in.is_undefined()) {
723 // if flag has become expired it should not have a "globals" flag defined anymore.
724 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
725 !version_less_than(JDK_Version::current(), flag.expired_in)) {
726 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
727 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
728 success = false;
729 }
730 }
731 }
732 }
733 return success;
734 }
735 #endif
736
737 bool Arguments::atojulong(const char *s, julong* result) {
738 return parse_integer(s, result);
739 }
740
741 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
742 if (size < min_size) return arg_too_small;
743 if (size > max_size) return arg_too_big;
744 return arg_in_range;
745 }
746
747 // Describe an argument out of range error
748 void Arguments::describe_range_error(ArgsRange errcode) {
749 switch(errcode) {
750 case arg_too_big:
751 jio_fprintf(defaultStream::error_stream(),
752 "The specified size exceeds the maximum "
753 "representable size.\n");
754 break;
755 case arg_too_small:
756 case arg_unreadable:
757 case arg_in_range:
758 // do nothing for now
759 break;
760 default:
761 ShouldNotReachHere();
762 }
763 }
764
765 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
766 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
767 return true;
768 } else {
769 return false;
770 }
771 }
772
773 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
774 // strtod allows leading whitespace, but our flag format does not.
775 if (*value == '\0' || isspace((unsigned char) *value)) {
776 return false;
777 }
778 char* end;
779 errno = 0;
780 double v = strtod(value, &end);
781 if ((errno != 0) || (*end != 0)) {
782 return false;
783 }
784 if (g_isnan(v) || !g_isfinite(v)) {
785 // Currently we cannot handle these special values.
786 return false;
787 }
788
789 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
790 return true;
791 }
792 return false;
793 }
794
795 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
796 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
797
798 if (flag->is_int()) {
799 int v;
800 if (parse_integer(value, &v)) {
801 result = JVMFlagAccess::set_int(flag, &v, origin);
802 }
803 } else if (flag->is_uint()) {
804 uint v;
805 if (parse_integer(value, &v)) {
806 result = JVMFlagAccess::set_uint(flag, &v, origin);
807 }
808 } else if (flag->is_intx()) {
809 intx v;
810 if (parse_integer(value, &v)) {
811 result = JVMFlagAccess::set_intx(flag, &v, origin);
812 }
813 } else if (flag->is_uintx()) {
814 uintx v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_uintx(flag, &v, origin);
817 }
818 } else if (flag->is_uint64_t()) {
819 uint64_t v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
822 }
823 } else if (flag->is_size_t()) {
824 size_t v;
825 if (parse_integer(value, &v)) {
826 result = JVMFlagAccess::set_size_t(flag, &v, origin);
827 }
828 }
829
830 return result == JVMFlag::SUCCESS;
831 }
832
833 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
834 if (value[0] == '\0') {
835 value = nullptr;
836 }
837 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
838 // Contract: JVMFlag always returns a pointer that needs freeing.
839 FREE_C_HEAP_ARRAY(char, value);
840 return true;
841 }
842
843 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
844 const char* old_value = "";
845 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
846 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
847 size_t new_len = strlen(new_value);
848 const char* value;
849 char* free_this_too = nullptr;
850 if (old_len == 0) {
851 value = new_value;
852 } else if (new_len == 0) {
853 value = old_value;
854 } else {
855 size_t length = old_len + 1 + new_len + 1;
856 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
857 // each new setting adds another LINE to the switch:
858 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
859 value = buf;
860 free_this_too = buf;
861 }
862 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
863 // JVMFlag always returns a pointer that needs freeing.
864 FREE_C_HEAP_ARRAY(char, value);
865 // JVMFlag made its own copy, so I must delete my own temp. buffer.
866 FREE_C_HEAP_ARRAY(char, free_this_too);
867 return true;
868 }
869
870 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
871 const char* real_name = real_flag_name(arg);
872 JDK_Version since = JDK_Version();
873 switch (is_deprecated_flag(arg, &since)) {
874 case -1: {
875 // Obsolete or expired, so don't process normally,
876 // but allow for an obsolete flag we're still
877 // temporarily allowing.
878 if (!is_obsolete_flag(arg, &since)) {
879 return real_name;
880 }
881 // Note if we're not considered obsolete then we can't be expired either
882 // as obsoletion must come first.
883 return nullptr;
884 }
885 case 0:
886 return real_name;
887 case 1: {
888 char version[256];
889 since.to_string(version, sizeof(version));
890 if (real_name != arg) {
891 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
892 arg, version, real_name);
893 } else {
894 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
895 arg, version);
896 }
897 return real_name;
898 }
899 }
900 ShouldNotReachHere();
901 return nullptr;
902 }
903
904 #define BUFLEN 255
905
906 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
907 char name_copied[BUFLEN+1];
908 if (name[name_length] != 0) {
909 if (name_length > BUFLEN) {
910 return nullptr;
911 } else {
912 strncpy(name_copied, name, name_length);
913 name_copied[name_length] = '\0';
914 name = name_copied;
915 }
916 }
917
918 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
919 if (real_name == nullptr) {
920 return nullptr;
921 }
922 JVMFlag* flag = JVMFlag::find_flag(real_name);
923 return flag;
924 }
925
926 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
927 bool is_bool = false;
928 bool bool_val = false;
929 char c = *arg;
930 if (c == '+' || c == '-') {
931 is_bool = true;
932 bool_val = (c == '+');
933 arg++;
934 }
935
936 const char* name = arg;
937 while (true) {
938 c = *arg;
939 if (isalnum(c) || (c == '_')) {
940 ++arg;
941 } else {
942 break;
943 }
944 }
945
946 size_t name_len = size_t(arg - name);
947 if (name_len == 0) {
948 return false;
949 }
950
951 JVMFlag* flag = find_jvm_flag(name, name_len);
952 if (flag == nullptr) {
953 return false;
954 }
955
956 if (is_bool) {
957 if (*arg != 0) {
958 // Error -- extra characters such as -XX:+BoolFlag=123
959 return false;
960 }
961 return set_bool_flag(flag, bool_val, origin);
962 }
963
964 if (arg[0] == '=') {
965 const char* value = arg + 1;
966 if (flag->is_ccstr()) {
967 if (flag->ccstr_accumulates()) {
968 return append_to_string_flag(flag, value, origin);
969 } else {
970 return set_string_flag(flag, value, origin);
971 }
972 } else if (flag->is_double()) {
973 return set_fp_numeric_flag(flag, value, origin);
974 } else {
975 return set_numeric_flag(flag, value, origin);
976 }
977 }
978
979 if (arg[0] == ':' && arg[1] == '=') {
980 // -XX:Foo:=xxx will reset the string flag to the given value.
981 const char* value = arg + 2;
982 return set_string_flag(flag, value, origin);
983 }
984
985 return false;
986 }
987
988 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
989 assert(bldarray != nullptr, "illegal argument");
990
991 if (arg == nullptr) {
992 return;
993 }
994
995 int new_count = *count + 1;
996
997 // expand the array and add arg to the last element
998 if (*bldarray == nullptr) {
999 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1000 } else {
1001 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1002 }
1003 (*bldarray)[*count] = os::strdup_check_oom(arg);
1004 *count = new_count;
1005 }
1006
1007 void Arguments::build_jvm_args(const char* arg) {
1008 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1009 }
1010
1011 void Arguments::build_jvm_flags(const char* arg) {
1012 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1013 }
1014
1015 // utility function to return a string that concatenates all
1016 // strings in a given char** array
1017 const char* Arguments::build_resource_string(char** args, int count) {
1018 if (args == nullptr || count == 0) {
1019 return nullptr;
1020 }
1021 size_t length = 0;
1022 for (int i = 0; i < count; i++) {
1023 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1024 }
1025 char* s = NEW_RESOURCE_ARRAY(char, length);
1026 char* dst = s;
1027 for (int j = 0; j < count; j++) {
1028 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1029 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1030 dst += offset;
1031 length -= offset;
1032 }
1033 return (const char*) s;
1034 }
1035
1036 void Arguments::print_on(outputStream* st) {
1037 st->print_cr("VM Arguments:");
1038 if (num_jvm_flags() > 0) {
1039 st->print("jvm_flags: "); print_jvm_flags_on(st);
1040 st->cr();
1041 }
1042 if (num_jvm_args() > 0) {
1043 st->print("jvm_args: "); print_jvm_args_on(st);
1044 st->cr();
1045 }
1046 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1047 if (_java_class_path != nullptr) {
1048 char* path = _java_class_path->value();
1049 size_t len = strlen(path);
1050 st->print("java_class_path (initial): ");
1051 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1052 if (len == 0) {
1053 st->print_raw_cr("<not set>");
1054 } else {
1055 st->print_raw_cr(path, len);
1056 }
1057 }
1058 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1059 }
1060
1061 void Arguments::print_summary_on(outputStream* st) {
1062 // Print the command line. Environment variables that are helpful for
1063 // reproducing the problem are written later in the hs_err file.
1064 // flags are from setting file
1065 if (num_jvm_flags() > 0) {
1066 st->print_raw("Settings File: ");
1067 print_jvm_flags_on(st);
1068 st->cr();
1069 }
1070 // args are the command line and environment variable arguments.
1071 st->print_raw("Command Line: ");
1072 if (num_jvm_args() > 0) {
1073 print_jvm_args_on(st);
1074 }
1075 // this is the classfile and any arguments to the java program
1076 if (java_command() != nullptr) {
1077 st->print("%s", java_command());
1078 }
1079 st->cr();
1080 }
1081
1082 void Arguments::print_jvm_flags_on(outputStream* st) {
1083 if (_num_jvm_flags > 0) {
1084 for (int i=0; i < _num_jvm_flags; i++) {
1085 st->print("%s ", _jvm_flags_array[i]);
1086 }
1087 }
1088 }
1089
1090 void Arguments::print_jvm_args_on(outputStream* st) {
1091 if (_num_jvm_args > 0) {
1092 for (int i=0; i < _num_jvm_args; i++) {
1093 st->print("%s ", _jvm_args_array[i]);
1094 }
1095 }
1096 }
1097
1098 bool Arguments::process_argument(const char* arg,
1099 jboolean ignore_unrecognized,
1100 JVMFlagOrigin origin) {
1101 JDK_Version since = JDK_Version();
1102
1103 if (parse_argument(arg, origin)) {
1104 return true;
1105 }
1106
1107 // Determine if the flag has '+', '-', or '=' characters.
1108 bool has_plus_minus = (*arg == '+' || *arg == '-');
1109 const char* const argname = has_plus_minus ? arg + 1 : arg;
1110
1111 size_t arg_len;
1112 const char* equal_sign = strchr(argname, '=');
1113 if (equal_sign == nullptr) {
1114 arg_len = strlen(argname);
1115 } else {
1116 arg_len = equal_sign - argname;
1117 }
1118
1119 // Only make the obsolete check for valid arguments.
1120 if (arg_len <= BUFLEN) {
1121 // Construct a string which consists only of the argument name without '+', '-', or '='.
1122 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1123 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1124 if (is_obsolete_flag(stripped_argname, &since)) {
1125 char version[256];
1126 since.to_string(version, sizeof(version));
1127 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1128 return true;
1129 }
1130 }
1131
1132 // For locked flags, report a custom error message if available.
1133 // Otherwise, report the standard unrecognized VM option.
1134 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1135 if (found_flag != nullptr) {
1136 char locked_message_buf[BUFLEN];
1137 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1138 if (strlen(locked_message_buf) != 0) {
1139 #ifdef PRODUCT
1140 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1141 if (ignore_unrecognized && mismatched) {
1142 return true;
1143 }
1144 #endif
1145 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1146 }
1147 if (found_flag->is_bool() && !has_plus_minus) {
1148 jio_fprintf(defaultStream::error_stream(),
1149 "Missing +/- setting for VM option '%s'\n", argname);
1150 } else if (!found_flag->is_bool() && has_plus_minus) {
1151 jio_fprintf(defaultStream::error_stream(),
1152 "Unexpected +/- setting in VM option '%s'\n", argname);
1153 } else {
1154 jio_fprintf(defaultStream::error_stream(),
1155 "Improperly specified VM option '%s'\n", argname);
1156 }
1157 } else {
1158 if (ignore_unrecognized) {
1159 return true;
1160 }
1161 jio_fprintf(defaultStream::error_stream(),
1162 "Unrecognized VM option '%s'\n", argname);
1163 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1164 if (fuzzy_matched != nullptr) {
1165 jio_fprintf(defaultStream::error_stream(),
1166 "Did you mean '%s%s%s'?\n",
1167 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1168 fuzzy_matched->name(),
1169 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1170 }
1171 }
1172
1173 // allow for commandline "commenting out" options like -XX:#+Verbose
1174 return arg[0] == '#';
1175 }
1176
1177 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1178 FILE* stream = os::fopen(file_name, "rb");
1179 if (stream == nullptr) {
1180 if (should_exist) {
1181 jio_fprintf(defaultStream::error_stream(),
1182 "Could not open settings file %s\n", file_name);
1183 return false;
1184 } else {
1185 return true;
1186 }
1187 }
1188
1189 char token[1024];
1190 int pos = 0;
1191
1192 bool in_white_space = true;
1193 bool in_comment = false;
1194 bool in_quote = false;
1195 int quote_c = 0;
1196 bool result = true;
1197
1198 int c = getc(stream);
1199 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1200 if (in_white_space) {
1201 if (in_comment) {
1202 if (c == '\n') in_comment = false;
1203 } else {
1204 if (c == '#') in_comment = true;
1205 else if (!isspace((unsigned char) c)) {
1206 in_white_space = false;
1207 token[pos++] = checked_cast<char>(c);
1208 }
1209 }
1210 } else {
1211 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1212 // token ends at newline, or at unquoted whitespace
1213 // this allows a way to include spaces in string-valued options
1214 token[pos] = '\0';
1215 logOption(token);
1216 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1217 build_jvm_flags(token);
1218 pos = 0;
1219 in_white_space = true;
1220 in_quote = false;
1221 } else if (!in_quote && (c == '\'' || c == '"')) {
1222 in_quote = true;
1223 quote_c = c;
1224 } else if (in_quote && (c == quote_c)) {
1225 in_quote = false;
1226 } else {
1227 token[pos++] = checked_cast<char>(c);
1228 }
1229 }
1230 c = getc(stream);
1231 }
1232 if (pos > 0) {
1233 token[pos] = '\0';
1234 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1235 build_jvm_flags(token);
1236 }
1237 fclose(stream);
1238 return result;
1239 }
1240
1241 //=============================================================================================================
1242 // Parsing of properties (-D)
1243
1244 const char* Arguments::get_property(const char* key) {
1245 return PropertyList_get_value(system_properties(), key);
1246 }
1247
1248 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1249 const char* eq = strchr(prop, '=');
1250 const char* key;
1251 const char* value = "";
1252
1253 if (eq == nullptr) {
1254 // property doesn't have a value, thus use passed string
1255 key = prop;
1256 } else {
1257 // property have a value, thus extract it and save to the
1258 // allocated string
1259 size_t key_len = eq - prop;
1260 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1261
1262 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1263 key = tmp_key;
1264
1265 value = &prop[key_len + 1];
1266 }
1267
1268 if (internal == ExternalProperty) {
1269 CDSConfig::check_incompatible_property(key, value);
1270 }
1271
1272 if (strcmp(key, "java.compiler") == 0) {
1273 // we no longer support java.compiler system property, log a warning and let it get
1274 // passed to Java, like any other system property
1275 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1276 // for applications using NONE or empty value, log a more informative message
1277 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1278 } else {
1279 warning("The java.compiler system property is obsolete and no longer supported.");
1280 }
1281 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1282 // sun.java.launcher.is_altjvm property is
1283 // private and is processed in process_sun_java_launcher_properties();
1284 // the sun.java.launcher property is passed on to the java application
1285 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1286 // append is true, writable is true, internal is false
1287 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1288 WriteableProperty, ExternalProperty);
1289 } else {
1290 if (strcmp(key, "sun.java.command") == 0) {
1291 char *old_java_command = _java_command;
1292 _java_command = os::strdup_check_oom(value, mtArguments);
1293 if (old_java_command != nullptr) {
1294 os::free(old_java_command);
1295 }
1296 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1297 // If this property is set on the command line then its value will be
1298 // displayed in VM error logs as the URL at which to submit such logs.
1299 // Normally the URL displayed in error logs is different from the value
1300 // of this system property, so a different property should have been
1301 // used here, but we leave this as-is in case someone depends upon it.
1302 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1303 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1304 // its value without going through the property list or making a Java call.
1305 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1306 if (old_java_vendor_url_bug != nullptr) {
1307 os::free((void *)old_java_vendor_url_bug);
1308 }
1309 }
1310
1311 // Create new property and add at the end of the list
1312 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1313 }
1314
1315 if (key != prop) {
1316 // SystemProperty copy passed value, thus free previously allocated
1317 // memory
1318 FreeHeap((void *)key);
1319 }
1320
1321 return true;
1322 }
1323
1324 //===========================================================================================================
1325 // Setting int/mixed/comp mode flags
1326
1327 void Arguments::set_mode_flags(Mode mode) {
1328 // Set up default values for all flags.
1329 // If you add a flag to any of the branches below,
1330 // add a default value for it here.
1331 _mode = mode;
1332
1333 // Ensure Agent_OnLoad has the correct initial values.
1334 // This may not be the final mode; mode may change later in onload phase.
1335 PropertyList_unique_add(&_system_properties, "java.vm.info",
1336 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1337
1338 UseInterpreter = true;
1339 UseCompiler = true;
1340 UseLoopCounter = true;
1341
1342 // Default values may be platform/compiler dependent -
1343 // use the saved values
1344 ClipInlining = Arguments::_ClipInlining;
1345 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1346 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1347 BackgroundCompilation = Arguments::_BackgroundCompilation;
1348
1349 // Change from defaults based on mode
1350 switch (mode) {
1351 default:
1352 ShouldNotReachHere();
1353 break;
1354 case _int:
1355 UseCompiler = false;
1356 UseLoopCounter = false;
1357 AlwaysCompileLoopMethods = false;
1358 UseOnStackReplacement = false;
1359 break;
1360 case _mixed:
1361 // same as default
1362 break;
1363 case _comp:
1364 UseInterpreter = false;
1365 BackgroundCompilation = false;
1366 ClipInlining = false;
1367 break;
1368 }
1369 }
1370
1371 // Conflict: required to use shared spaces (-Xshare:on), but
1372 // incompatible command line options were chosen.
1373 void Arguments::no_shared_spaces(const char* message) {
1374 if (RequireSharedSpaces) {
1375 jio_fprintf(defaultStream::error_stream(),
1376 "Class data sharing is inconsistent with other specified options.\n");
1377 vm_exit_during_initialization("Unable to use shared archive", message);
1378 } else {
1379 log_info(cds)("Unable to use shared archive: %s", message);
1380 UseSharedSpaces = false;
1381 }
1382 }
1383
1384 static void set_object_alignment() {
1385 // Object alignment.
1386 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1387 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1388 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1389 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1390 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1391 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1392
1393 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1394 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1395
1396 // Oop encoding heap max
1397 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1398 }
1399
1400 size_t Arguments::max_heap_for_compressed_oops() {
1401 // Avoid sign flip.
1402 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1403 // We need to fit both the null page and the heap into the memory budget, while
1404 // keeping alignment constraints of the heap. To guarantee the latter, as the
1405 // null page is located before the heap, we pad the null page to the conservative
1406 // maximum alignment that the GC may ever impose upon the heap.
1407 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1408 _conservative_max_heap_alignment);
1409
1410 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1411 NOT_LP64(ShouldNotReachHere(); return 0);
1412 }
1413
1414 void Arguments::set_use_compressed_oops() {
1415 #ifdef _LP64
1416 // MaxHeapSize is not set up properly at this point, but
1417 // the only value that can override MaxHeapSize if we are
1418 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1419 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1420
1421 if (max_heap_size <= max_heap_for_compressed_oops()) {
1422 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1423 FLAG_SET_ERGO(UseCompressedOops, true);
1424 }
1425 } else {
1426 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1427 warning("Max heap size too large for Compressed Oops");
1428 FLAG_SET_DEFAULT(UseCompressedOops, false);
1429 }
1430 }
1431 #endif // _LP64
1432 }
1433
1434 void Arguments::set_conservative_max_heap_alignment() {
1435 // The conservative maximum required alignment for the heap is the maximum of
1436 // the alignments imposed by several sources: any requirements from the heap
1437 // itself and the maximum page size we may run the VM with.
1438 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1439 _conservative_max_heap_alignment = MAX4(heap_alignment,
1440 os::vm_allocation_granularity(),
1441 os::max_page_size(),
1442 GCArguments::compute_heap_alignment());
1443 }
1444
1445 jint Arguments::set_ergonomics_flags() {
1446 GCConfig::initialize();
1447
1448 set_conservative_max_heap_alignment();
1449
1450 #ifdef _LP64
1451 set_use_compressed_oops();
1452
1453 // Also checks that certain machines are slower with compressed oops
1454 // in vm_version initialization code.
1455 #endif // _LP64
1456
1457 return JNI_OK;
1458 }
1459
1460 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1461 size_t max_allocatable;
1462 size_t result = limit;
1463 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1464 // The AggressiveHeap check is a temporary workaround to avoid calling
1465 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1466 // selected. This works because AggressiveHeap implies UseParallelGC
1467 // where we know the ratio will be 1. Once the AggressiveHeap option is
1468 // removed, this can be cleaned up.
1469 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1470 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1471 result = MIN2(result, max_allocatable / fraction);
1472 }
1473 return result;
1474 }
1475
1476 // Use static initialization to get the default before parsing
1477 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1478
1479 void Arguments::set_heap_size() {
1480 julong phys_mem;
1481
1482 // If the user specified one of these options, they
1483 // want specific memory sizing so do not limit memory
1484 // based on compressed oops addressability.
1485 // Also, memory limits will be calculated based on
1486 // available os physical memory, not our MaxRAM limit,
1487 // unless MaxRAM is also specified.
1488 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1489 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1490 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1491 !FLAG_IS_DEFAULT(MaxRAM));
1492 if (override_coop_limit) {
1493 if (FLAG_IS_DEFAULT(MaxRAM)) {
1494 phys_mem = os::physical_memory();
1495 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1496 } else {
1497 phys_mem = (julong)MaxRAM;
1498 }
1499 } else {
1500 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1501 : (julong)MaxRAM;
1502 }
1503
1504 // If the maximum heap size has not been set with -Xmx,
1505 // then set it as fraction of the size of physical memory,
1506 // respecting the maximum and minimum sizes of the heap.
1507 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1508 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1509 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1510 if (reasonable_min < MaxHeapSize) {
1511 // Small physical memory, so use a minimum fraction of it for the heap
1512 reasonable_max = reasonable_min;
1513 } else {
1514 // Not-small physical memory, so require a heap at least
1515 // as large as MaxHeapSize
1516 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1517 }
1518
1519 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1520 // Limit the heap size to ErgoHeapSizeLimit
1521 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1522 }
1523
1524 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1525
1526 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1527 // An initial heap size was specified on the command line,
1528 // so be sure that the maximum size is consistent. Done
1529 // after call to limit_heap_by_allocatable_memory because that
1530 // method might reduce the allocation size.
1531 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1532 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1533 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1534 }
1535
1536 #ifdef _LP64
1537 if (UseCompressedOops || UseCompressedClassPointers) {
1538 // HeapBaseMinAddress can be greater than default but not less than.
1539 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1540 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1541 // matches compressed oops printing flags
1542 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1543 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1544 DefaultHeapBaseMinAddress,
1545 DefaultHeapBaseMinAddress/G,
1546 HeapBaseMinAddress);
1547 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1548 }
1549 }
1550 }
1551 if (UseCompressedOops) {
1552 // Limit the heap size to the maximum possible when using compressed oops
1553 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1554
1555 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1556 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1557 // but it should be not less than default MaxHeapSize.
1558 max_coop_heap -= HeapBaseMinAddress;
1559 }
1560
1561 // If user specified flags prioritizing os physical
1562 // memory limits, then disable compressed oops if
1563 // limits exceed max_coop_heap and UseCompressedOops
1564 // was not specified.
1565 if (reasonable_max > max_coop_heap) {
1566 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1567 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1568 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1569 "Please check the setting of MaxRAMPercentage %5.2f."
1570 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1571 FLAG_SET_ERGO(UseCompressedOops, false);
1572 } else {
1573 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1574 }
1575 }
1576 }
1577 #endif // _LP64
1578
1579 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1580 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1581 }
1582
1583 // If the minimum or initial heap_size have not been set or requested to be set
1584 // ergonomically, set them accordingly.
1585 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1586 julong reasonable_minimum = (julong)(OldSize + NewSize);
1587
1588 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1589
1590 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1591
1592 if (InitialHeapSize == 0) {
1593 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1594 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1595
1596 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1597 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1598
1599 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1600 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1601 }
1602 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1603 // synchronize with InitialHeapSize to avoid errors with the default value.
1604 if (MinHeapSize == 0) {
1605 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1606 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1607 }
1608 }
1609 }
1610
1611 // This option inspects the machine and attempts to set various
1612 // parameters to be optimal for long-running, memory allocation
1613 // intensive jobs. It is intended for machines with large
1614 // amounts of cpu and memory.
1615 jint Arguments::set_aggressive_heap_flags() {
1616 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1617 // VM, but we may not be able to represent the total physical memory
1618 // available (like having 8gb of memory on a box but using a 32bit VM).
1619 // Thus, we need to make sure we're using a julong for intermediate
1620 // calculations.
1621 julong initHeapSize;
1622 julong total_memory = os::physical_memory();
1623
1624 if (total_memory < (julong) 256 * M) {
1625 jio_fprintf(defaultStream::error_stream(),
1626 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1627 vm_exit(1);
1628 }
1629
1630 // The heap size is half of available memory, or (at most)
1631 // all of possible memory less 160mb (leaving room for the OS
1632 // when using ISM). This is the maximum; because adaptive sizing
1633 // is turned on below, the actual space used may be smaller.
1634
1635 initHeapSize = MIN2(total_memory / (julong) 2,
1636 total_memory - (julong) 160 * M);
1637
1638 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1639
1640 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1641 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1642 return JNI_EINVAL;
1643 }
1644 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1645 return JNI_EINVAL;
1646 }
1647 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1648 return JNI_EINVAL;
1649 }
1650 }
1651 if (FLAG_IS_DEFAULT(NewSize)) {
1652 // Make the young generation 3/8ths of the total heap.
1653 if (FLAG_SET_CMDLINE(NewSize,
1654 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1655 return JNI_EINVAL;
1656 }
1657 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1658 return JNI_EINVAL;
1659 }
1660 }
1661
1662 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1663 FLAG_SET_DEFAULT(UseLargePages, true);
1664 #endif
1665
1666 // Increase some data structure sizes for efficiency
1667 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1668 return JNI_EINVAL;
1669 }
1670 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1671 return JNI_EINVAL;
1672 }
1673
1674 // See the OldPLABSize comment below, but replace 'after promotion'
1675 // with 'after copying'. YoungPLABSize is the size of the survivor
1676 // space per-gc-thread buffers. The default is 4kw.
1677 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1678 return JNI_EINVAL;
1679 }
1680
1681 // OldPLABSize is the size of the buffers in the old gen that
1682 // UseParallelGC uses to promote live data that doesn't fit in the
1683 // survivor spaces. At any given time, there's one for each gc thread.
1684 // The default size is 1kw. These buffers are rarely used, since the
1685 // survivor spaces are usually big enough. For specjbb, however, there
1686 // are occasions when there's lots of live data in the young gen
1687 // and we end up promoting some of it. We don't have a definite
1688 // explanation for why bumping OldPLABSize helps, but the theory
1689 // is that a bigger PLAB results in retaining something like the
1690 // original allocation order after promotion, which improves mutator
1691 // locality. A minor effect may be that larger PLABs reduce the
1692 // number of PLAB allocation events during gc. The value of 8kw
1693 // was arrived at by experimenting with specjbb.
1694 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1695 return JNI_EINVAL;
1696 }
1697
1698 // Enable parallel GC and adaptive generation sizing
1699 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1700 return JNI_EINVAL;
1701 }
1702
1703 // Encourage steady state memory management
1704 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1705 return JNI_EINVAL;
1706 }
1707
1708 return JNI_OK;
1709 }
1710
1711 // This must be called after ergonomics.
1712 void Arguments::set_bytecode_flags() {
1713 if (!RewriteBytecodes) {
1714 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1715 }
1716 }
1717
1718 // Aggressive optimization flags
1719 jint Arguments::set_aggressive_opts_flags() {
1720 #ifdef COMPILER2
1721 if (AggressiveUnboxing) {
1722 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1723 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1724 } else if (!EliminateAutoBox) {
1725 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1726 AggressiveUnboxing = false;
1727 }
1728 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1729 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1730 } else if (!DoEscapeAnalysis) {
1731 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1732 AggressiveUnboxing = false;
1733 }
1734 }
1735 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1736 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1737 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1738 }
1739 // Feed the cache size setting into the JDK
1740 char buffer[1024];
1741 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1742 if (!add_property(buffer)) {
1743 return JNI_ENOMEM;
1744 }
1745 }
1746 #endif
1747
1748 return JNI_OK;
1749 }
1750
1751 //===========================================================================================================
1752
1753 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1754 if (_sun_java_launcher != _default_java_launcher) {
1755 os::free(const_cast<char*>(_sun_java_launcher));
1756 }
1757 _sun_java_launcher = os::strdup_check_oom(launcher);
1758 }
1759
1760 bool Arguments::created_by_java_launcher() {
1761 assert(_sun_java_launcher != nullptr, "property must have value");
1762 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1763 }
1764
1765 bool Arguments::sun_java_launcher_is_altjvm() {
1766 return _sun_java_launcher_is_altjvm;
1767 }
1768
1769 //===========================================================================================================
1770 // Parsing of main arguments
1771
1772 unsigned int addreads_count = 0;
1773 unsigned int addexports_count = 0;
1774 unsigned int addopens_count = 0;
1775 unsigned int patch_mod_count = 0;
1776 unsigned int enable_native_access_count = 0;
1777
1778 // Check the consistency of vm_init_args
1779 bool Arguments::check_vm_args_consistency() {
1780 // Method for adding checks for flag consistency.
1781 // The intent is to warn the user of all possible conflicts,
1782 // before returning an error.
1783 // Note: Needs platform-dependent factoring.
1784 bool status = true;
1785
1786 if (TLABRefillWasteFraction == 0) {
1787 jio_fprintf(defaultStream::error_stream(),
1788 "TLABRefillWasteFraction should be a denominator, "
1789 "not " SIZE_FORMAT "\n",
1790 TLABRefillWasteFraction);
1791 status = false;
1792 }
1793
1794 status = CompilerConfig::check_args_consistency(status);
1795 #if INCLUDE_JVMCI
1796 if (status && EnableJVMCI) {
1797 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1798 AddProperty, UnwriteableProperty, InternalProperty);
1799 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1800 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1801 return false;
1802 }
1803 }
1804 }
1805 #endif
1806
1807 #if INCLUDE_JFR
1808 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1809 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1810 return false;
1811 }
1812 }
1813 #endif
1814
1815 #ifndef SUPPORT_RESERVED_STACK_AREA
1816 if (StackReservedPages != 0) {
1817 FLAG_SET_CMDLINE(StackReservedPages, 0);
1818 warning("Reserved Stack Area not supported on this platform");
1819 }
1820 #endif
1821
1822 #ifndef _LP64
1823 if (LockingMode == LM_LEGACY) {
1824 FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT);
1825 // Self-forwarding in bit 3 of the mark-word conflicts
1826 // with 4-byte-aligned stack-locks.
1827 warning("Legacy locking not supported on this platform");
1828 }
1829 #endif
1830
1831 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1832 // ObjectMonitorTable requires lightweight locking.
1833 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1834 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1835 }
1836
1837 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1838 if (LockingMode == LM_MONITOR) {
1839 jio_fprintf(defaultStream::error_stream(),
1840 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1841 return false;
1842 }
1843 #endif
1844 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1845 jio_fprintf(defaultStream::error_stream(),
1846 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1847 return false;
1848 }
1849 return status;
1850 }
1851
1852 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1853 const char* option_type) {
1854 if (ignore) return false;
1855
1856 const char* spacer = " ";
1857 if (option_type == nullptr) {
1858 option_type = ++spacer; // Set both to the empty string.
1859 }
1860
1861 jio_fprintf(defaultStream::error_stream(),
1862 "Unrecognized %s%soption: %s\n", option_type, spacer,
1863 option->optionString);
1864 return true;
1865 }
1866
1867 static const char* user_assertion_options[] = {
1868 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1869 };
1870
1871 static const char* system_assertion_options[] = {
1872 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1873 };
1874
1875 bool Arguments::parse_uint(const char* value,
1876 uint* uint_arg,
1877 uint min_size) {
1878 uint n;
1879 if (!parse_integer(value, &n)) {
1880 return false;
1881 }
1882 if (n >= min_size) {
1883 *uint_arg = n;
1884 return true;
1885 } else {
1886 return false;
1887 }
1888 }
1889
1890 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1891 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1892 CDSConfig::check_internal_module_property(prop_name, prop_value);
1893 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1894 char* property = AllocateHeap(prop_len, mtArguments);
1895 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1896 if (ret < 0 || ret >= (int)prop_len) {
1897 FreeHeap(property);
1898 return false;
1899 }
1900 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1901 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1902 // that multiple occurrences of the associated flag just causes the existing property value to be
1903 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1904 // to a property after we have finished flag processing.
1905 bool added = add_property(property, WriteableProperty, internal);
1906 FreeHeap(property);
1907 return added;
1908 }
1909
1910 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1911 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1912 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1913 const unsigned int props_count_limit = 1000;
1914 const int max_digits = 3;
1915 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1916
1917 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1918 if (count < props_count_limit) {
1919 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1920 char* property = AllocateHeap(prop_len, mtArguments);
1921 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1922 if (ret < 0 || ret >= (int)prop_len) {
1923 FreeHeap(property);
1924 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1925 return false;
1926 }
1927 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1928 FreeHeap(property);
1929 return added;
1930 }
1931
1932 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1933 return false;
1934 }
1935
1936 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1937 julong* long_arg,
1938 julong min_size,
1939 julong max_size) {
1940 if (!parse_integer(s, long_arg)) return arg_unreadable;
1941 return check_memory_size(*long_arg, min_size, max_size);
1942 }
1943
1944 // Parse JavaVMInitArgs structure
1945
1946 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1947 const JavaVMInitArgs *java_tool_options_args,
1948 const JavaVMInitArgs *java_options_args,
1949 const JavaVMInitArgs *cmd_line_args) {
1950 bool patch_mod_javabase = false;
1951
1952 // Save default settings for some mode flags
1953 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1954 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1955 Arguments::_ClipInlining = ClipInlining;
1956 Arguments::_BackgroundCompilation = BackgroundCompilation;
1957
1958 // Remember the default value of SharedBaseAddress.
1959 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1960
1961 // Setup flags for mixed which is the default
1962 set_mode_flags(_mixed);
1963
1964 // Parse args structure generated from java.base vm options resource
1965 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1966 if (result != JNI_OK) {
1967 return result;
1968 }
1969
1970 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1971 // variable (if present).
1972 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1973 if (result != JNI_OK) {
1974 return result;
1975 }
1976
1977 // Parse args structure generated from the command line flags.
1978 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1979 if (result != JNI_OK) {
1980 return result;
1981 }
1982
1983 // Parse args structure generated from the _JAVA_OPTIONS environment
1984 // variable (if present) (mimics classic VM)
1985 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1986 if (result != JNI_OK) {
1987 return result;
1988 }
1989
1990 // Disable CDS for exploded image
1991 if (!has_jimage()) {
1992 no_shared_spaces("CDS disabled on exploded JDK");
1993 }
1994
1995 // We need to ensure processor and memory resources have been properly
1996 // configured - which may rely on arguments we just processed - before
1997 // doing the final argument processing. Any argument processing that
1998 // needs to know about processor and memory resources must occur after
1999 // this point.
2000
2001 os::init_container_support();
2002
2003 SystemMemoryBarrier::initialize();
2004
2005 // Do final processing now that all arguments have been parsed
2006 result = finalize_vm_init_args(patch_mod_javabase);
2007 if (result != JNI_OK) {
2008 return result;
2009 }
2010
2011 return JNI_OK;
2012 }
2013
2014 #if !INCLUDE_JVMTI
2015 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2016 // represents a valid JDWP agent. is_path==true denotes that we
2017 // are dealing with -agentpath (case where name is a path), otherwise with
2018 // -agentlib
2019 static bool valid_jdwp_agent(char *name, bool is_path) {
2020 char *_name;
2021 const char *_jdwp = "jdwp";
2022 size_t _len_jdwp, _len_prefix;
2023
2024 if (is_path) {
2025 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2026 return false;
2027 }
2028
2029 _name++; // skip past last path separator
2030 _len_prefix = strlen(JNI_LIB_PREFIX);
2031
2032 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2033 return false;
2034 }
2035
2036 _name += _len_prefix;
2037 _len_jdwp = strlen(_jdwp);
2038
2039 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2040 _name += _len_jdwp;
2041 }
2042 else {
2043 return false;
2044 }
2045
2046 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2047 return false;
2048 }
2049
2050 return true;
2051 }
2052
2053 if (strcmp(name, _jdwp) == 0) {
2054 return true;
2055 }
2056
2057 return false;
2058 }
2059 #endif
2060
2061 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2062 // --patch-module=<module>=<file>(<pathsep><file>)*
2063 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2064 // Find the equal sign between the module name and the path specification
2065 const char* module_equal = strchr(patch_mod_tail, '=');
2066 if (module_equal == nullptr) {
2067 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2068 return JNI_ERR;
2069 } else {
2070 // Pick out the module name
2071 size_t module_len = module_equal - patch_mod_tail;
2072 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2073 if (module_name != nullptr) {
2074 memcpy(module_name, patch_mod_tail, module_len);
2075 *(module_name + module_len) = '\0';
2076 // The path piece begins one past the module_equal sign
2077 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2078 FREE_C_HEAP_ARRAY(char, module_name);
2079 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2080 return JNI_ENOMEM;
2081 }
2082 } else {
2083 return JNI_ENOMEM;
2084 }
2085 }
2086 return JNI_OK;
2087 }
2088
2089 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2090 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2091 // The min and max sizes match the values in globals.hpp, but scaled
2092 // with K. The values have been chosen so that alignment with page
2093 // size doesn't change the max value, which makes the conversions
2094 // back and forth between Xss value and ThreadStackSize value easier.
2095 // The values have also been chosen to fit inside a 32-bit signed type.
2096 const julong min_ThreadStackSize = 0;
2097 const julong max_ThreadStackSize = 1 * M;
2098
2099 // Make sure the above values match the range set in globals.hpp
2100 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2101 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2102 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2103
2104 const julong min_size = min_ThreadStackSize * K;
2105 const julong max_size = max_ThreadStackSize * K;
2106
2107 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2108
2109 julong size = 0;
2110 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2111 if (errcode != arg_in_range) {
2112 bool silent = (option == nullptr); // Allow testing to silence error messages
2113 if (!silent) {
2114 jio_fprintf(defaultStream::error_stream(),
2115 "Invalid thread stack size: %s\n", option->optionString);
2116 describe_range_error(errcode);
2117 }
2118 return JNI_EINVAL;
2119 }
2120
2121 // Internally track ThreadStackSize in units of 1024 bytes.
2122 const julong size_aligned = align_up(size, K);
2123 assert(size <= size_aligned,
2124 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2125 size, size_aligned);
2126
2127 const julong size_in_K = size_aligned / K;
2128 assert(size_in_K < (julong)max_intx,
2129 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2130 size_in_K);
2131
2132 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2133 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2134 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2135 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2136 max_expanded, size_in_K);
2137
2138 *out_ThreadStackSize = (intx)size_in_K;
2139
2140 return JNI_OK;
2141 }
2142
2143 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2144 // For match_option to return remaining or value part of option string
2145 const char* tail;
2146
2147 // iterate over arguments
2148 for (int index = 0; index < args->nOptions; index++) {
2149 bool is_absolute_path = false; // for -agentpath vs -agentlib
2150
2151 const JavaVMOption* option = args->options + index;
2152
2153 if (!match_option(option, "-Djava.class.path", &tail) &&
2154 !match_option(option, "-Dsun.java.command", &tail) &&
2155 !match_option(option, "-Dsun.java.launcher", &tail)) {
2156
2157 // add all jvm options to the jvm_args string. This string
2158 // is used later to set the java.vm.args PerfData string constant.
2159 // the -Djava.class.path and the -Dsun.java.command options are
2160 // omitted from jvm_args string as each have their own PerfData
2161 // string constant object.
2162 build_jvm_args(option->optionString);
2163 }
2164
2165 // -verbose:[class/module/gc/jni]
2166 if (match_option(option, "-verbose", &tail)) {
2167 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2168 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2169 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2170 } else if (!strcmp(tail, ":module")) {
2171 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2172 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2173 } else if (!strcmp(tail, ":gc")) {
2174 if (_legacyGCLogging.lastFlag == 0) {
2175 _legacyGCLogging.lastFlag = 1;
2176 }
2177 } else if (!strcmp(tail, ":jni")) {
2178 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2179 }
2180 // -da / -ea / -disableassertions / -enableassertions
2181 // These accept an optional class/package name separated by a colon, e.g.,
2182 // -da:java.lang.Thread.
2183 } else if (match_option(option, user_assertion_options, &tail, true)) {
2184 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2185 if (*tail == '\0') {
2186 JavaAssertions::setUserClassDefault(enable);
2187 } else {
2188 assert(*tail == ':', "bogus match by match_option()");
2189 JavaAssertions::addOption(tail + 1, enable);
2190 }
2191 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2192 } else if (match_option(option, system_assertion_options, &tail, false)) {
2193 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2194 JavaAssertions::setSystemClassDefault(enable);
2195 // -bootclasspath:
2196 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2197 jio_fprintf(defaultStream::output_stream(),
2198 "-Xbootclasspath is no longer a supported option.\n");
2199 return JNI_EINVAL;
2200 // -bootclasspath/a:
2201 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2202 Arguments::append_sysclasspath(tail);
2203 // -bootclasspath/p:
2204 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2205 jio_fprintf(defaultStream::output_stream(),
2206 "-Xbootclasspath/p is no longer a supported option.\n");
2207 return JNI_EINVAL;
2208 // -Xrun
2209 } else if (match_option(option, "-Xrun", &tail)) {
2210 if (tail != nullptr) {
2211 const char* pos = strchr(tail, ':');
2212 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2213 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2214 jio_snprintf(name, len + 1, "%s", tail);
2215
2216 char *options = nullptr;
2217 if(pos != nullptr) {
2218 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2219 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2220 }
2221 #if !INCLUDE_JVMTI
2222 if (strcmp(name, "jdwp") == 0) {
2223 jio_fprintf(defaultStream::error_stream(),
2224 "Debugging agents are not supported in this VM\n");
2225 return JNI_ERR;
2226 }
2227 #endif // !INCLUDE_JVMTI
2228 JvmtiAgentList::add_xrun(name, options, false);
2229 FREE_C_HEAP_ARRAY(char, name);
2230 FREE_C_HEAP_ARRAY(char, options);
2231 }
2232 } else if (match_option(option, "--add-reads=", &tail)) {
2233 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2234 return JNI_ENOMEM;
2235 }
2236 } else if (match_option(option, "--add-exports=", &tail)) {
2237 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2238 return JNI_ENOMEM;
2239 }
2240 } else if (match_option(option, "--add-opens=", &tail)) {
2241 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2242 return JNI_ENOMEM;
2243 }
2244 } else if (match_option(option, "--add-modules=", &tail)) {
2245 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2246 return JNI_ENOMEM;
2247 }
2248 } else if (match_option(option, "--enable-native-access=", &tail)) {
2249 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2250 return JNI_ENOMEM;
2251 }
2252 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2253 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2254 return JNI_ENOMEM;
2255 }
2256 } else if (match_option(option, "--limit-modules=", &tail)) {
2257 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2258 return JNI_ENOMEM;
2259 }
2260 } else if (match_option(option, "--module-path=", &tail)) {
2261 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2262 return JNI_ENOMEM;
2263 }
2264 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2265 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2266 return JNI_ENOMEM;
2267 }
2268 } else if (match_option(option, "--patch-module=", &tail)) {
2269 // --patch-module=<module>=<file>(<pathsep><file>)*
2270 int res = process_patch_mod_option(tail, patch_mod_javabase);
2271 if (res != JNI_OK) {
2272 return res;
2273 }
2274 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2275 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2276 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2277 AddProperty, WriteableProperty, InternalProperty);
2278 } else {
2279 jio_fprintf(defaultStream::error_stream(),
2280 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2281 return JNI_ERR;
2282 }
2283 } else if (match_option(option, "--illegal-access=", &tail)) {
2284 char version[256];
2285 JDK_Version::jdk(17).to_string(version, sizeof(version));
2286 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2287 // -agentlib and -agentpath
2288 } else if (match_option(option, "-agentlib:", &tail) ||
2289 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2290 if(tail != nullptr) {
2291 const char* pos = strchr(tail, '=');
2292 char* name;
2293 if (pos == nullptr) {
2294 name = os::strdup_check_oom(tail, mtArguments);
2295 } else {
2296 size_t len = pos - tail;
2297 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2298 memcpy(name, tail, len);
2299 name[len] = '\0';
2300 }
2301
2302 char *options = nullptr;
2303 if(pos != nullptr) {
2304 options = os::strdup_check_oom(pos + 1, mtArguments);
2305 }
2306 #if !INCLUDE_JVMTI
2307 if (valid_jdwp_agent(name, is_absolute_path)) {
2308 jio_fprintf(defaultStream::error_stream(),
2309 "Debugging agents are not supported in this VM\n");
2310 return JNI_ERR;
2311 }
2312 #endif // !INCLUDE_JVMTI
2313 JvmtiAgentList::add(name, options, is_absolute_path);
2314 os::free(name);
2315 os::free(options);
2316 }
2317 // -javaagent
2318 } else if (match_option(option, "-javaagent:", &tail)) {
2319 #if !INCLUDE_JVMTI
2320 jio_fprintf(defaultStream::error_stream(),
2321 "Instrumentation agents are not supported in this VM\n");
2322 return JNI_ERR;
2323 #else
2324 if (tail != nullptr) {
2325 size_t length = strlen(tail) + 1;
2326 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2327 jio_snprintf(options, length, "%s", tail);
2328 JvmtiAgentList::add("instrument", options, false);
2329 FREE_C_HEAP_ARRAY(char, options);
2330
2331 // java agents need module java.instrument
2332 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2333 return JNI_ENOMEM;
2334 }
2335 }
2336 #endif // !INCLUDE_JVMTI
2337 // --enable_preview
2338 } else if (match_option(option, "--enable-preview")) {
2339 set_enable_preview();
2340 // -Xnoclassgc
2341 } else if (match_option(option, "-Xnoclassgc")) {
2342 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2343 return JNI_EINVAL;
2344 }
2345 // -Xbatch
2346 } else if (match_option(option, "-Xbatch")) {
2347 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2348 return JNI_EINVAL;
2349 }
2350 // -Xmn for compatibility with other JVM vendors
2351 } else if (match_option(option, "-Xmn", &tail)) {
2352 julong long_initial_young_size = 0;
2353 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2354 if (errcode != arg_in_range) {
2355 jio_fprintf(defaultStream::error_stream(),
2356 "Invalid initial young generation size: %s\n", option->optionString);
2357 describe_range_error(errcode);
2358 return JNI_EINVAL;
2359 }
2360 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2361 return JNI_EINVAL;
2362 }
2363 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2364 return JNI_EINVAL;
2365 }
2366 // -Xms
2367 } else if (match_option(option, "-Xms", &tail)) {
2368 julong size = 0;
2369 // an initial heap size of 0 means automatically determine
2370 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2371 if (errcode != arg_in_range) {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "Invalid initial heap size: %s\n", option->optionString);
2374 describe_range_error(errcode);
2375 return JNI_EINVAL;
2376 }
2377 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2378 return JNI_EINVAL;
2379 }
2380 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2381 return JNI_EINVAL;
2382 }
2383 // -Xmx
2384 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2385 julong long_max_heap_size = 0;
2386 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2387 if (errcode != arg_in_range) {
2388 jio_fprintf(defaultStream::error_stream(),
2389 "Invalid maximum heap size: %s\n", option->optionString);
2390 describe_range_error(errcode);
2391 return JNI_EINVAL;
2392 }
2393 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2394 return JNI_EINVAL;
2395 }
2396 // Xmaxf
2397 } else if (match_option(option, "-Xmaxf", &tail)) {
2398 char* err;
2399 int maxf = (int)(strtod(tail, &err) * 100);
2400 if (*err != '\0' || *tail == '\0') {
2401 jio_fprintf(defaultStream::error_stream(),
2402 "Bad max heap free percentage size: %s\n",
2403 option->optionString);
2404 return JNI_EINVAL;
2405 } else {
2406 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2407 return JNI_EINVAL;
2408 }
2409 }
2410 // Xminf
2411 } else if (match_option(option, "-Xminf", &tail)) {
2412 char* err;
2413 int minf = (int)(strtod(tail, &err) * 100);
2414 if (*err != '\0' || *tail == '\0') {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "Bad min heap free percentage size: %s\n",
2417 option->optionString);
2418 return JNI_EINVAL;
2419 } else {
2420 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 }
2424 // -Xss
2425 } else if (match_option(option, "-Xss", &tail)) {
2426 intx value = 0;
2427 jint err = parse_xss(option, tail, &value);
2428 if (err != JNI_OK) {
2429 return err;
2430 }
2431 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2432 return JNI_EINVAL;
2433 }
2434 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2435 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2436 julong long_ReservedCodeCacheSize = 0;
2437
2438 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2439 if (errcode != arg_in_range) {
2440 jio_fprintf(defaultStream::error_stream(),
2441 "Invalid maximum code cache size: %s.\n", option->optionString);
2442 return JNI_EINVAL;
2443 }
2444 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2445 return JNI_EINVAL;
2446 }
2447 // -green
2448 } else if (match_option(option, "-green")) {
2449 jio_fprintf(defaultStream::error_stream(),
2450 "Green threads support not available\n");
2451 return JNI_EINVAL;
2452 // -native
2453 } else if (match_option(option, "-native")) {
2454 // HotSpot always uses native threads, ignore silently for compatibility
2455 // -Xrs
2456 } else if (match_option(option, "-Xrs")) {
2457 // Classic/EVM option, new functionality
2458 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2459 return JNI_EINVAL;
2460 }
2461 // -Xprof
2462 } else if (match_option(option, "-Xprof")) {
2463 char version[256];
2464 // Obsolete in JDK 10
2465 JDK_Version::jdk(10).to_string(version, sizeof(version));
2466 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2467 // -Xinternalversion
2468 } else if (match_option(option, "-Xinternalversion")) {
2469 jio_fprintf(defaultStream::output_stream(), "%s\n",
2470 VM_Version::internal_vm_info_string());
2471 vm_exit(0);
2472 #ifndef PRODUCT
2473 // -Xprintflags
2474 } else if (match_option(option, "-Xprintflags")) {
2475 JVMFlag::printFlags(tty, false);
2476 vm_exit(0);
2477 #endif
2478 // -D
2479 } else if (match_option(option, "-D", &tail)) {
2480 const char* value;
2481 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2482 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2483 // abort if -Djava.endorsed.dirs is set
2484 jio_fprintf(defaultStream::output_stream(),
2485 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2486 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2487 return JNI_EINVAL;
2488 }
2489 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2490 *value != '\0' && strcmp(value, "\"\"") != 0) {
2491 // abort if -Djava.ext.dirs is set
2492 jio_fprintf(defaultStream::output_stream(),
2493 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2494 return JNI_EINVAL;
2495 }
2496 // Check for module related properties. They must be set using the modules
2497 // options. For example: use "--add-modules=java.sql", not
2498 // "-Djdk.module.addmods=java.sql"
2499 if (is_internal_module_property(option->optionString + 2)) {
2500 needs_module_property_warning = true;
2501 continue;
2502 }
2503 if (!add_property(tail)) {
2504 return JNI_ENOMEM;
2505 }
2506 // Out of the box management support
2507 if (match_option(option, "-Dcom.sun.management", &tail)) {
2508 #if INCLUDE_MANAGEMENT
2509 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2510 return JNI_EINVAL;
2511 }
2512 // management agent in module jdk.management.agent
2513 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2514 return JNI_ENOMEM;
2515 }
2516 #else
2517 jio_fprintf(defaultStream::output_stream(),
2518 "-Dcom.sun.management is not supported in this VM.\n");
2519 return JNI_ERR;
2520 #endif
2521 }
2522 // -Xint
2523 } else if (match_option(option, "-Xint")) {
2524 set_mode_flags(_int);
2525 mode_flag_cmd_line = true;
2526 // -Xmixed
2527 } else if (match_option(option, "-Xmixed")) {
2528 set_mode_flags(_mixed);
2529 mode_flag_cmd_line = true;
2530 // -Xcomp
2531 } else if (match_option(option, "-Xcomp")) {
2532 // for testing the compiler; turn off all flags that inhibit compilation
2533 set_mode_flags(_comp);
2534 mode_flag_cmd_line = true;
2535 // -Xshare:dump
2536 } else if (match_option(option, "-Xshare:dump")) {
2537 CDSConfig::enable_dumping_static_archive();
2538 CDSConfig::set_old_cds_flags_used();
2539 // -Xshare:on
2540 } else if (match_option(option, "-Xshare:on")) {
2541 UseSharedSpaces = true;
2542 RequireSharedSpaces = true;
2543 CDSConfig::set_old_cds_flags_used();
2544 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2545 } else if (match_option(option, "-Xshare:auto")) {
2546 UseSharedSpaces = true;
2547 RequireSharedSpaces = false;
2548 xshare_auto_cmd_line = true;
2549 CDSConfig::set_old_cds_flags_used();
2550 // -Xshare:off
2551 } else if (match_option(option, "-Xshare:off")) {
2552 UseSharedSpaces = false;
2553 RequireSharedSpaces = false;
2554 CDSConfig::set_old_cds_flags_used();
2555 // -Xverify
2556 } else if (match_option(option, "-Xverify", &tail)) {
2557 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2558 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2559 return JNI_EINVAL;
2560 }
2561 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2562 return JNI_EINVAL;
2563 }
2564 } else if (strcmp(tail, ":remote") == 0) {
2565 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2566 return JNI_EINVAL;
2567 }
2568 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2569 return JNI_EINVAL;
2570 }
2571 } else if (strcmp(tail, ":none") == 0) {
2572 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2573 return JNI_EINVAL;
2574 }
2575 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2576 return JNI_EINVAL;
2577 }
2578 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2579 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2580 return JNI_EINVAL;
2581 }
2582 // -Xdebug
2583 } else if (match_option(option, "-Xdebug")) {
2584 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2585 } else if (match_option(option, "-Xloggc:", &tail)) {
2586 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2587 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2588 _legacyGCLogging.lastFlag = 2;
2589 _legacyGCLogging.file = os::strdup_check_oom(tail);
2590 } else if (match_option(option, "-Xlog", &tail)) {
2591 bool ret = false;
2592 if (strcmp(tail, ":help") == 0) {
2593 fileStream stream(defaultStream::output_stream());
2594 LogConfiguration::print_command_line_help(&stream);
2595 vm_exit(0);
2596 } else if (strcmp(tail, ":disable") == 0) {
2597 LogConfiguration::disable_logging();
2598 ret = true;
2599 } else if (strcmp(tail, ":async") == 0) {
2600 LogConfiguration::set_async_mode(true);
2601 ret = true;
2602 } else if (*tail == '\0') {
2603 ret = LogConfiguration::parse_command_line_arguments();
2604 assert(ret, "-Xlog without arguments should never fail to parse");
2605 } else if (*tail == ':') {
2606 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2607 }
2608 if (ret == false) {
2609 jio_fprintf(defaultStream::error_stream(),
2610 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2611 tail);
2612 return JNI_EINVAL;
2613 }
2614 // JNI hooks
2615 } else if (match_option(option, "-Xcheck", &tail)) {
2616 if (!strcmp(tail, ":jni")) {
2617 #if !INCLUDE_JNI_CHECK
2618 warning("JNI CHECKING is not supported in this VM");
2619 #else
2620 CheckJNICalls = true;
2621 #endif // INCLUDE_JNI_CHECK
2622 } else if (is_bad_option(option, args->ignoreUnrecognized,
2623 "check")) {
2624 return JNI_EINVAL;
2625 }
2626 } else if (match_option(option, "vfprintf")) {
2627 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2628 } else if (match_option(option, "exit")) {
2629 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2630 } else if (match_option(option, "abort")) {
2631 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2632 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2633 // and the last option wins.
2634 } else if (match_option(option, "-XX:+NeverTenure")) {
2635 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2636 return JNI_EINVAL;
2637 }
2638 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2639 return JNI_EINVAL;
2640 }
2641 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2645 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2646 return JNI_EINVAL;
2647 }
2648 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2649 return JNI_EINVAL;
2650 }
2651 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2652 return JNI_EINVAL;
2653 }
2654 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2655 uint max_tenuring_thresh = 0;
2656 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2659 return JNI_EINVAL;
2660 }
2661
2662 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665
2666 if (MaxTenuringThreshold == 0) {
2667 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2668 return JNI_EINVAL;
2669 }
2670 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2671 return JNI_EINVAL;
2672 }
2673 } else {
2674 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2675 return JNI_EINVAL;
2676 }
2677 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2678 return JNI_EINVAL;
2679 }
2680 }
2681 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2682 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2683 return JNI_EINVAL;
2684 }
2685 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2689 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2696 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2697 return JNI_EINVAL;
2698 }
2699 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2700 return JNI_EINVAL;
2701 }
2702 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2703 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2704 return JNI_EINVAL;
2705 }
2706 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2707 return JNI_EINVAL;
2708 }
2709 } else if (match_option(option, "--finalization=", &tail)) {
2710 if (strcmp(tail, "enabled") == 0) {
2711 InstanceKlass::set_finalization_enabled(true);
2712 } else if (strcmp(tail, "disabled") == 0) {
2713 InstanceKlass::set_finalization_enabled(false);
2714 } else {
2715 jio_fprintf(defaultStream::error_stream(),
2716 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2717 tail);
2718 return JNI_EINVAL;
2719 }
2720 #if !defined(DTRACE_ENABLED)
2721 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2722 jio_fprintf(defaultStream::error_stream(),
2723 "DTraceMethodProbes flag is not applicable for this configuration\n");
2724 return JNI_EINVAL;
2725 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "DTraceAllocProbes flag is not applicable for this configuration\n");
2728 return JNI_EINVAL;
2729 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2732 return JNI_EINVAL;
2733 #endif // !defined(DTRACE_ENABLED)
2734 #ifdef ASSERT
2735 } else if (match_option(option, "-XX:+FullGCALot")) {
2736 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 #endif
2740 #if !INCLUDE_MANAGEMENT
2741 } else if (match_option(option, "-XX:+ManagementServer")) {
2742 jio_fprintf(defaultStream::error_stream(),
2743 "ManagementServer is not supported in this VM.\n");
2744 return JNI_ERR;
2745 #endif // INCLUDE_MANAGEMENT
2746 #if INCLUDE_JVMCI
2747 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2748 if (EnableJVMCIProduct) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2751 return JNI_EINVAL;
2752 }
2753 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2754 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2755 if (use_graal_jit) {
2756 const char* jvmci_compiler = get_property("jvmci.Compiler");
2757 if (jvmci_compiler != nullptr) {
2758 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2761 return JNI_ERR;
2762 }
2763 } else if (!add_property("jvmci.Compiler=graal")) {
2764 return JNI_ENOMEM;
2765 }
2766 }
2767
2768 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2769 if (EnableJVMCIProduct) {
2770 continue;
2771 }
2772 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2773 // Allow this flag if it has been unlocked.
2774 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2775 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Unable to enable JVMCI in product mode\n");
2778 return JNI_ERR;
2779 }
2780 }
2781 // The flag was locked so process normally to report that error
2782 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2783 return JNI_EINVAL;
2784 }
2785 #endif // INCLUDE_JVMCI
2786 #if INCLUDE_JFR
2787 } else if (match_jfr_option(&option)) {
2788 return JNI_EINVAL;
2789 #endif
2790 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2791 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2792 // already been handled
2793 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2794 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2795 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2796 return JNI_EINVAL;
2797 }
2798 }
2799 // Unknown option
2800 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2801 return JNI_ERR;
2802 }
2803 }
2804
2805 // PrintSharedArchiveAndExit will turn on
2806 // -Xshare:on
2807 // -Xlog:class+path=info
2808 if (PrintSharedArchiveAndExit) {
2809 UseSharedSpaces = true;
2810 RequireSharedSpaces = true;
2811 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2812 }
2813
2814 fix_appclasspath();
2815
2816 return JNI_OK;
2817 }
2818
2819 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2820 // For java.base check for duplicate --patch-module options being specified on the command line.
2821 // This check is only required for java.base, all other duplicate module specifications
2822 // will be checked during module system initialization. The module system initialization
2823 // will throw an ExceptionInInitializerError if this situation occurs.
2824 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2825 if (*patch_mod_javabase) {
2826 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2827 } else {
2828 *patch_mod_javabase = true;
2829 }
2830 }
2831
2832 // Create GrowableArray lazily, only if --patch-module has been specified
2833 if (_patch_mod_prefix == nullptr) {
2834 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2835 }
2836
2837 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2838 }
2839
2840 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2841 //
2842 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2843 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2844 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2845 // path is treated as the current directory.
2846 //
2847 // This causes problems with CDS, which requires that all directories specified in the classpath
2848 // must be empty. In most cases, applications do NOT want to load classes from the current
2849 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2850 // scripts compatible with CDS.
2851 void Arguments::fix_appclasspath() {
2852 if (IgnoreEmptyClassPaths) {
2853 const char separator = *os::path_separator();
2854 const char* src = _java_class_path->value();
2855
2856 // skip over all the leading empty paths
2857 while (*src == separator) {
2858 src ++;
2859 }
2860
2861 char* copy = os::strdup_check_oom(src, mtArguments);
2862
2863 // trim all trailing empty paths
2864 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2865 *tail = '\0';
2866 }
2867
2868 char from[3] = {separator, separator, '\0'};
2869 char to [2] = {separator, '\0'};
2870 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2871 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2872 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2873 }
2874
2875 _java_class_path->set_writeable_value(copy);
2876 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2877 }
2878 }
2879
2880 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2881 // check if the default lib/endorsed directory exists; if so, error
2882 char path[JVM_MAXPATHLEN];
2883 const char* fileSep = os::file_separator();
2884 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2885
2886 DIR* dir = os::opendir(path);
2887 if (dir != nullptr) {
2888 jio_fprintf(defaultStream::output_stream(),
2889 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2890 "in modular form will be supported via the concept of upgradeable modules.\n");
2891 os::closedir(dir);
2892 return JNI_ERR;
2893 }
2894
2895 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2896 dir = os::opendir(path);
2897 if (dir != nullptr) {
2898 jio_fprintf(defaultStream::output_stream(),
2899 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2900 "Use -classpath instead.\n.");
2901 os::closedir(dir);
2902 return JNI_ERR;
2903 }
2904
2905 // This must be done after all arguments have been processed
2906 // and the container support has been initialized since AggressiveHeap
2907 // relies on the amount of total memory available.
2908 if (AggressiveHeap) {
2909 jint result = set_aggressive_heap_flags();
2910 if (result != JNI_OK) {
2911 return result;
2912 }
2913 }
2914
2915 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2916 // but like -Xint, leave compilation thresholds unaffected.
2917 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2918 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2919 set_mode_flags(_int);
2920 }
2921
2922 #ifdef ZERO
2923 // Zero always runs in interpreted mode
2924 set_mode_flags(_int);
2925 #endif
2926
2927 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2928 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2929 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2930 }
2931
2932 #if !COMPILER2_OR_JVMCI
2933 // Don't degrade server performance for footprint
2934 if (FLAG_IS_DEFAULT(UseLargePages) &&
2935 MaxHeapSize < LargePageHeapSizeThreshold) {
2936 // No need for large granularity pages w/small heaps.
2937 // Note that large pages are enabled/disabled for both the
2938 // Java heap and the code cache.
2939 FLAG_SET_DEFAULT(UseLargePages, false);
2940 }
2941
2942 UNSUPPORTED_OPTION(ProfileInterpreter);
2943 #endif
2944
2945 // Parse the CompilationMode flag
2946 if (!CompilationModeFlag::initialize()) {
2947 return JNI_ERR;
2948 }
2949
2950 if (!check_vm_args_consistency()) {
2951 return JNI_ERR;
2952 }
2953
2954 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line, xshare_auto_cmd_line)) {
2955 return JNI_ERR;
2956 }
2957
2958 if (StoreCachedCode) {
2959 FLAG_SET_ERGO_IF_DEFAULT(CachedCodeMaxSize, 512*M);
2960 }
2961
2962 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2963 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2964 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2965
2966 return JNI_OK;
2967 }
2968
2969 // Helper class for controlling the lifetime of JavaVMInitArgs
2970 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2971 // deleted on the destruction of the ScopedVMInitArgs object.
2972 class ScopedVMInitArgs : public StackObj {
2973 private:
2974 JavaVMInitArgs _args;
2975 char* _container_name;
2976 bool _is_set;
2977 char* _vm_options_file_arg;
2978
2979 public:
2980 ScopedVMInitArgs(const char *container_name) {
2981 _args.version = JNI_VERSION_1_2;
2982 _args.nOptions = 0;
2983 _args.options = nullptr;
2984 _args.ignoreUnrecognized = false;
2985 _container_name = (char *)container_name;
2986 _is_set = false;
2987 _vm_options_file_arg = nullptr;
2988 }
2989
2990 // Populates the JavaVMInitArgs object represented by this
2991 // ScopedVMInitArgs object with the arguments in options. The
2992 // allocated memory is deleted by the destructor. If this method
2993 // returns anything other than JNI_OK, then this object is in a
2994 // partially constructed state, and should be abandoned.
2995 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2996 _is_set = true;
2997 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2998 JavaVMOption, options->length(), mtArguments);
2999 if (options_arr == nullptr) {
3000 return JNI_ENOMEM;
3001 }
3002 _args.options = options_arr;
3003
3004 for (int i = 0; i < options->length(); i++) {
3005 options_arr[i] = options->at(i);
3006 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3007 if (options_arr[i].optionString == nullptr) {
3008 // Rely on the destructor to do cleanup.
3009 _args.nOptions = i;
3010 return JNI_ENOMEM;
3011 }
3012 }
3013
3014 _args.nOptions = options->length();
3015 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3016 return JNI_OK;
3017 }
3018
3019 JavaVMInitArgs* get() { return &_args; }
3020 char* container_name() { return _container_name; }
3021 bool is_set() { return _is_set; }
3022 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3023 char* vm_options_file_arg() { return _vm_options_file_arg; }
3024
3025 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3026 if (_vm_options_file_arg != nullptr) {
3027 os::free(_vm_options_file_arg);
3028 }
3029 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3030 }
3031
3032 ~ScopedVMInitArgs() {
3033 if (_vm_options_file_arg != nullptr) {
3034 os::free(_vm_options_file_arg);
3035 }
3036 if (_args.options == nullptr) return;
3037 for (int i = 0; i < _args.nOptions; i++) {
3038 os::free(_args.options[i].optionString);
3039 }
3040 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3041 }
3042
3043 // Insert options into this option list, to replace option at
3044 // vm_options_file_pos (-XX:VMOptionsFile)
3045 jint insert(const JavaVMInitArgs* args,
3046 const JavaVMInitArgs* args_to_insert,
3047 const int vm_options_file_pos) {
3048 assert(_args.options == nullptr, "shouldn't be set yet");
3049 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3050 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3051
3052 int length = args->nOptions + args_to_insert->nOptions - 1;
3053 // Construct new option array
3054 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3055 for (int i = 0; i < args->nOptions; i++) {
3056 if (i == vm_options_file_pos) {
3057 // insert the new options starting at the same place as the
3058 // -XX:VMOptionsFile option
3059 for (int j = 0; j < args_to_insert->nOptions; j++) {
3060 options.push(args_to_insert->options[j]);
3061 }
3062 } else {
3063 options.push(args->options[i]);
3064 }
3065 }
3066 // make into options array
3067 return set_args(&options);
3068 }
3069 };
3070
3071 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3072 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3073 }
3074
3075 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3076 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3077 }
3078
3079 jint Arguments::parse_options_environment_variable(const char* name,
3080 ScopedVMInitArgs* vm_args) {
3081 char *buffer = ::getenv(name);
3082
3083 // Don't check this environment variable if user has special privileges
3084 // (e.g. unix su command).
3085 if (buffer == nullptr || os::have_special_privileges()) {
3086 return JNI_OK;
3087 }
3088
3089 if ((buffer = os::strdup(buffer)) == nullptr) {
3090 return JNI_ENOMEM;
3091 }
3092
3093 jio_fprintf(defaultStream::error_stream(),
3094 "Picked up %s: %s\n", name, buffer);
3095
3096 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3097
3098 os::free(buffer);
3099 return retcode;
3100 }
3101
3102 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3103 // read file into buffer
3104 int fd = ::open(file_name, O_RDONLY);
3105 if (fd < 0) {
3106 jio_fprintf(defaultStream::error_stream(),
3107 "Could not open options file '%s'\n",
3108 file_name);
3109 return JNI_ERR;
3110 }
3111
3112 struct stat stbuf;
3113 int retcode = os::stat(file_name, &stbuf);
3114 if (retcode != 0) {
3115 jio_fprintf(defaultStream::error_stream(),
3116 "Could not stat options file '%s'\n",
3117 file_name);
3118 ::close(fd);
3119 return JNI_ERR;
3120 }
3121
3122 if (stbuf.st_size == 0) {
3123 // tell caller there is no option data and that is ok
3124 ::close(fd);
3125 return JNI_OK;
3126 }
3127
3128 // '+ 1' for null termination even with max bytes
3129 size_t bytes_alloc = stbuf.st_size + 1;
3130
3131 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3132 if (nullptr == buf) {
3133 jio_fprintf(defaultStream::error_stream(),
3134 "Could not allocate read buffer for options file parse\n");
3135 ::close(fd);
3136 return JNI_ENOMEM;
3137 }
3138
3139 memset(buf, 0, bytes_alloc);
3140
3141 // Fill buffer
3142 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3143 ::close(fd);
3144 if (bytes_read < 0) {
3145 FREE_C_HEAP_ARRAY(char, buf);
3146 jio_fprintf(defaultStream::error_stream(),
3147 "Could not read options file '%s'\n", file_name);
3148 return JNI_ERR;
3149 }
3150
3151 if (bytes_read == 0) {
3152 // tell caller there is no option data and that is ok
3153 FREE_C_HEAP_ARRAY(char, buf);
3154 return JNI_OK;
3155 }
3156
3157 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3158
3159 FREE_C_HEAP_ARRAY(char, buf);
3160 return retcode;
3161 }
3162
3163 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3164 // Construct option array
3165 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3166
3167 // some pointers to help with parsing
3168 char *buffer_end = buffer + buf_len;
3169 char *opt_hd = buffer;
3170 char *wrt = buffer;
3171 char *rd = buffer;
3172
3173 // parse all options
3174 while (rd < buffer_end) {
3175 // skip leading white space from the input string
3176 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3177 rd++;
3178 }
3179
3180 if (rd >= buffer_end) {
3181 break;
3182 }
3183
3184 // Remember this is where we found the head of the token.
3185 opt_hd = wrt;
3186
3187 // Tokens are strings of non white space characters separated
3188 // by one or more white spaces.
3189 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3190 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3191 int quote = *rd; // matching quote to look for
3192 rd++; // don't copy open quote
3193 while (rd < buffer_end && *rd != quote) {
3194 // include everything (even spaces)
3195 // up until the close quote
3196 *wrt++ = *rd++; // copy to option string
3197 }
3198
3199 if (rd < buffer_end) {
3200 rd++; // don't copy close quote
3201 } else {
3202 // did not see closing quote
3203 jio_fprintf(defaultStream::error_stream(),
3204 "Unmatched quote in %s\n", name);
3205 return JNI_ERR;
3206 }
3207 } else {
3208 *wrt++ = *rd++; // copy to option string
3209 }
3210 }
3211
3212 // steal a white space character and set it to null
3213 *wrt++ = '\0';
3214 // We now have a complete token
3215
3216 JavaVMOption option;
3217 option.optionString = opt_hd;
3218 option.extraInfo = nullptr;
3219
3220 options.append(option); // Fill in option
3221
3222 rd++; // Advance to next character
3223 }
3224
3225 // Fill out JavaVMInitArgs structure.
3226 return vm_args->set_args(&options);
3227 }
3228
3229 #ifndef PRODUCT
3230 // Determine whether LogVMOutput should be implicitly turned on.
3231 static bool use_vm_log() {
3232 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3233 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3234 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3235 PrintAssembly || TraceDeoptimization ||
3236 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3237 return true;
3238 }
3239
3240 #ifdef COMPILER1
3241 if (PrintC1Statistics) {
3242 return true;
3243 }
3244 #endif // COMPILER1
3245
3246 #ifdef COMPILER2
3247 if (PrintOptoAssembly || PrintOptoStatistics) {
3248 return true;
3249 }
3250 #endif // COMPILER2
3251
3252 return false;
3253 }
3254
3255 #endif // PRODUCT
3256
3257 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3258 for (int index = 0; index < args->nOptions; index++) {
3259 const JavaVMOption* option = args->options + index;
3260 const char* tail;
3261 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3262 return true;
3263 }
3264 }
3265 return false;
3266 }
3267
3268 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3269 const char* vm_options_file,
3270 const int vm_options_file_pos,
3271 ScopedVMInitArgs* vm_options_file_args,
3272 ScopedVMInitArgs* args_out) {
3273 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3274 if (code != JNI_OK) {
3275 return code;
3276 }
3277
3278 if (vm_options_file_args->get()->nOptions < 1) {
3279 return JNI_OK;
3280 }
3281
3282 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3283 jio_fprintf(defaultStream::error_stream(),
3284 "A VM options file may not refer to a VM options file. "
3285 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3286 "options file '%s' in options container '%s' is an error.\n",
3287 vm_options_file_args->vm_options_file_arg(),
3288 vm_options_file_args->container_name());
3289 return JNI_EINVAL;
3290 }
3291
3292 return args_out->insert(args, vm_options_file_args->get(),
3293 vm_options_file_pos);
3294 }
3295
3296 // Expand -XX:VMOptionsFile found in args_in as needed.
3297 // mod_args and args_out parameters may return values as needed.
3298 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3299 ScopedVMInitArgs* mod_args,
3300 JavaVMInitArgs** args_out) {
3301 jint code = match_special_option_and_act(args_in, mod_args);
3302 if (code != JNI_OK) {
3303 return code;
3304 }
3305
3306 if (mod_args->is_set()) {
3307 // args_in contains -XX:VMOptionsFile and mod_args contains the
3308 // original options from args_in along with the options expanded
3309 // from the VMOptionsFile. Return a short-hand to the caller.
3310 *args_out = mod_args->get();
3311 } else {
3312 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3313 }
3314 return JNI_OK;
3315 }
3316
3317 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3318 ScopedVMInitArgs* args_out) {
3319 // Remaining part of option string
3320 const char* tail;
3321 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3322
3323 for (int index = 0; index < args->nOptions; index++) {
3324 const JavaVMOption* option = args->options + index;
3325 if (match_option(option, "-XX:Flags=", &tail)) {
3326 Arguments::set_jvm_flags_file(tail);
3327 continue;
3328 }
3329 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3330 if (vm_options_file_args.found_vm_options_file_arg()) {
3331 jio_fprintf(defaultStream::error_stream(),
3332 "The option '%s' is already specified in the options "
3333 "container '%s' so the specification of '%s' in the "
3334 "same options container is an error.\n",
3335 vm_options_file_args.vm_options_file_arg(),
3336 vm_options_file_args.container_name(),
3337 option->optionString);
3338 return JNI_EINVAL;
3339 }
3340 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3341 // If there's a VMOptionsFile, parse that
3342 jint code = insert_vm_options_file(args, tail, index,
3343 &vm_options_file_args, args_out);
3344 if (code != JNI_OK) {
3345 return code;
3346 }
3347 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3348 if (args_out->is_set()) {
3349 // The VMOptions file inserted some options so switch 'args'
3350 // to the new set of options, and continue processing which
3351 // preserves "last option wins" semantics.
3352 args = args_out->get();
3353 // The first option from the VMOptionsFile replaces the
3354 // current option. So we back track to process the
3355 // replacement option.
3356 index--;
3357 }
3358 continue;
3359 }
3360 if (match_option(option, "-XX:+PrintVMOptions")) {
3361 PrintVMOptions = true;
3362 continue;
3363 }
3364 if (match_option(option, "-XX:-PrintVMOptions")) {
3365 PrintVMOptions = false;
3366 continue;
3367 }
3368 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3369 IgnoreUnrecognizedVMOptions = true;
3370 continue;
3371 }
3372 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3373 IgnoreUnrecognizedVMOptions = false;
3374 continue;
3375 }
3376 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3377 JVMFlag::printFlags(tty, false);
3378 vm_exit(0);
3379 }
3380
3381 #ifndef PRODUCT
3382 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3383 JVMFlag::printFlags(tty, true);
3384 vm_exit(0);
3385 }
3386 #endif
3387 }
3388 return JNI_OK;
3389 }
3390
3391 static void print_options(const JavaVMInitArgs *args) {
3392 const char* tail;
3393 for (int index = 0; index < args->nOptions; index++) {
3394 const JavaVMOption *option = args->options + index;
3395 if (match_option(option, "-XX:", &tail)) {
3396 logOption(tail);
3397 }
3398 }
3399 }
3400
3401 bool Arguments::handle_deprecated_print_gc_flags() {
3402 if (PrintGC) {
3403 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3404 }
3405 if (PrintGCDetails) {
3406 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3407 }
3408
3409 if (_legacyGCLogging.lastFlag == 2) {
3410 // -Xloggc was used to specify a filename
3411 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3412
3413 LogTarget(Error, logging) target;
3414 LogStream errstream(target);
3415 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3416 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3417 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3418 }
3419 return true;
3420 }
3421
3422 static void apply_debugger_ergo() {
3423 #ifdef ASSERT
3424 if (ReplayCompiles) {
3425 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3426 }
3427
3428 if (UseDebuggerErgo) {
3429 // Turn on sub-flags
3430 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3431 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3432 }
3433
3434 if (UseDebuggerErgo2) {
3435 // Debugging with limited number of CPUs
3436 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3437 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3438 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3439 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3440 }
3441 #endif // ASSERT
3442 }
3443
3444 // Parse entry point called from JNI_CreateJavaVM
3445
3446 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3447 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3448 JVMFlag::check_all_flag_declarations();
3449
3450 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3451 const char* hotspotrc = ".hotspotrc";
3452 bool settings_file_specified = false;
3453 bool needs_hotspotrc_warning = false;
3454 ScopedVMInitArgs initial_vm_options_args("");
3455 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3456 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3457
3458 // Pointers to current working set of containers
3459 JavaVMInitArgs* cur_cmd_args;
3460 JavaVMInitArgs* cur_vm_options_args;
3461 JavaVMInitArgs* cur_java_options_args;
3462 JavaVMInitArgs* cur_java_tool_options_args;
3463
3464 // Containers for modified/expanded options
3465 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3466 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3467 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3468 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3469
3470
3471 jint code =
3472 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3473 if (code != JNI_OK) {
3474 return code;
3475 }
3476
3477 code = parse_java_options_environment_variable(&initial_java_options_args);
3478 if (code != JNI_OK) {
3479 return code;
3480 }
3481
3482 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3483 char *vmoptions = ClassLoader::lookup_vm_options();
3484 if (vmoptions != nullptr) {
3485 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3486 FREE_C_HEAP_ARRAY(char, vmoptions);
3487 if (code != JNI_OK) {
3488 return code;
3489 }
3490 }
3491
3492 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3493 &mod_java_tool_options_args,
3494 &cur_java_tool_options_args);
3495 if (code != JNI_OK) {
3496 return code;
3497 }
3498
3499 code = expand_vm_options_as_needed(initial_cmd_args,
3500 &mod_cmd_args,
3501 &cur_cmd_args);
3502 if (code != JNI_OK) {
3503 return code;
3504 }
3505
3506 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3507 &mod_java_options_args,
3508 &cur_java_options_args);
3509 if (code != JNI_OK) {
3510 return code;
3511 }
3512
3513 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3514 &mod_vm_options_args,
3515 &cur_vm_options_args);
3516 if (code != JNI_OK) {
3517 return code;
3518 }
3519
3520 const char* flags_file = Arguments::get_jvm_flags_file();
3521 settings_file_specified = (flags_file != nullptr);
3522
3523 if (IgnoreUnrecognizedVMOptions) {
3524 cur_cmd_args->ignoreUnrecognized = true;
3525 cur_java_tool_options_args->ignoreUnrecognized = true;
3526 cur_java_options_args->ignoreUnrecognized = true;
3527 }
3528
3529 // Parse specified settings file
3530 if (settings_file_specified) {
3531 if (!process_settings_file(flags_file, true,
3532 cur_cmd_args->ignoreUnrecognized)) {
3533 return JNI_EINVAL;
3534 }
3535 } else {
3536 #ifdef ASSERT
3537 // Parse default .hotspotrc settings file
3538 if (!process_settings_file(".hotspotrc", false,
3539 cur_cmd_args->ignoreUnrecognized)) {
3540 return JNI_EINVAL;
3541 }
3542 #else
3543 struct stat buf;
3544 if (os::stat(hotspotrc, &buf) == 0) {
3545 needs_hotspotrc_warning = true;
3546 }
3547 #endif
3548 }
3549
3550 if (PrintVMOptions) {
3551 print_options(cur_java_tool_options_args);
3552 print_options(cur_cmd_args);
3553 print_options(cur_java_options_args);
3554 }
3555
3556 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3557 jint result = parse_vm_init_args(cur_vm_options_args,
3558 cur_java_tool_options_args,
3559 cur_java_options_args,
3560 cur_cmd_args);
3561
3562 if (result != JNI_OK) {
3563 return result;
3564 }
3565
3566 // Delay warning until here so that we've had a chance to process
3567 // the -XX:-PrintWarnings flag
3568 if (needs_hotspotrc_warning) {
3569 warning("%s file is present but has been ignored. "
3570 "Run with -XX:Flags=%s to load the file.",
3571 hotspotrc, hotspotrc);
3572 }
3573
3574 if (needs_module_property_warning) {
3575 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3576 " names that are reserved for internal use.");
3577 }
3578
3579 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3580 UNSUPPORTED_OPTION(UseLargePages);
3581 #endif
3582
3583 #if defined(AIX)
3584 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3585 #endif
3586
3587 #ifndef PRODUCT
3588 if (TraceBytecodesAt != 0) {
3589 TraceBytecodes = true;
3590 }
3591 #endif // PRODUCT
3592
3593 if (ScavengeRootsInCode == 0) {
3594 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3595 warning("Forcing ScavengeRootsInCode non-zero");
3596 }
3597 ScavengeRootsInCode = 1;
3598 }
3599
3600 if (!handle_deprecated_print_gc_flags()) {
3601 return JNI_EINVAL;
3602 }
3603
3604 // Set object alignment values.
3605 set_object_alignment();
3606
3607 #if !INCLUDE_CDS
3608 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3609 jio_fprintf(defaultStream::error_stream(),
3610 "Shared spaces are not supported in this VM\n");
3611 return JNI_ERR;
3612 }
3613 if (DumpLoadedClassList != nullptr) {
3614 jio_fprintf(defaultStream::error_stream(),
3615 "DumpLoadedClassList is not supported in this VM\n");
3616 return JNI_ERR;
3617 }
3618 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3619 log_is_enabled(Info, cds)) {
3620 warning("Shared spaces are not supported in this VM");
3621 UseSharedSpaces = false;
3622 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3623 }
3624 no_shared_spaces("CDS Disabled");
3625 #endif // INCLUDE_CDS
3626
3627 // Verify NMT arguments
3628 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3629 if (lvl == NMT_unknown) {
3630 jio_fprintf(defaultStream::error_stream(),
3631 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3632 return JNI_ERR;
3633 }
3634 if (PrintNMTStatistics && lvl == NMT_off) {
3635 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3636 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3637 }
3638
3639 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3640 if (trace_dependencies && VerifyDependencies) {
3641 warning("dependency logging results may be inflated by VerifyDependencies");
3642 }
3643
3644 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3645 log_is_enabled(Info, class, load, cause);
3646 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3647 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3648 }
3649
3650 apply_debugger_ergo();
3651
3652 // The VMThread needs to stop now and then to execute these debug options.
3653 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3654 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3655 }
3656
3657 if (log_is_enabled(Info, arguments)) {
3658 LogStream st(Log(arguments)::info());
3659 Arguments::print_on(&st);
3660 }
3661
3662 #ifdef _LP64
3663 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3664 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3665 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3666 }
3667 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
3668 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3669 }
3670 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3671 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3672 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3673 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3674
3675 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3676 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3677 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3678 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3679 } else {
3680 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3681 }
3682 }
3683 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3684 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3685 }
3686 ObjLayout::initialize();
3687 #endif
3688
3689 return JNI_OK;
3690 }
3691
3692 jint Arguments::apply_ergo() {
3693 // Set flags based on ergonomics.
3694 jint result = set_ergonomics_flags();
3695 if (result != JNI_OK) return result;
3696
3697 // Set heap size based on available physical memory
3698 set_heap_size();
3699
3700 GCConfig::arguments()->initialize();
3701
3702 if (UseCompressedClassPointers) {
3703 CompressedKlassPointers::pre_initialize();
3704 }
3705
3706 CDSConfig::initialize();
3707
3708 // Initialize Metaspace flags and alignments
3709 Metaspace::ergo_initialize();
3710
3711 if (!StringDedup::ergo_initialize()) {
3712 return JNI_EINVAL;
3713 }
3714
3715 // Set compiler flags after GC is selected and GC specific
3716 // flags (LoopStripMiningIter) are set.
3717 CompilerConfig::ergo_initialize();
3718
3719 // Set bytecode rewriting flags
3720 set_bytecode_flags();
3721
3722 // Set flags if aggressive optimization flags are enabled
3723 jint code = set_aggressive_opts_flags();
3724 if (code != JNI_OK) {
3725 return code;
3726 }
3727
3728 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3729 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3730 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3731 warning("UseSecondarySupersTable is not supported");
3732 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3733 }
3734 UseSecondarySupersTable = false; // FIXME: Disabled for Leyden. Neet to fix SCAddressTable::id_for_address()
3735 if (!UseSecondarySupersTable) {
3736 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3737 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3738 }
3739
3740 #ifdef ZERO
3741 // Clear flags not supported on zero.
3742 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3743 #endif // ZERO
3744
3745 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3746 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3747 DebugNonSafepoints = true;
3748 }
3749
3750 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3751 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3752 }
3753
3754 // Treat the odd case where local verification is enabled but remote
3755 // verification is not as if both were enabled.
3756 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3757 log_info(verification)("Turning on remote verification because local verification is on");
3758 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3759 }
3760
3761 #ifndef PRODUCT
3762 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3763 if (use_vm_log()) {
3764 LogVMOutput = true;
3765 }
3766 }
3767 #endif // PRODUCT
3768
3769 if (PrintCommandLineFlags) {
3770 JVMFlag::printSetFlags(tty);
3771 }
3772
3773 #if COMPILER2_OR_JVMCI
3774 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3775 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3776 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3777 }
3778 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3779
3780 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3781 if (!EnableVectorReboxing) {
3782 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3783 } else {
3784 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3785 }
3786 }
3787 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3788
3789 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3790 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3791 }
3792 FLAG_SET_DEFAULT(UseVectorStubs, false);
3793 }
3794 #endif // COMPILER2_OR_JVMCI
3795
3796 if (log_is_enabled(Info, init)) {
3797 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3798 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3799 }
3800 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) {
3801 // automatically enable -Xlog:perf+class+link
3802 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link));
3803 }
3804 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3805 } else {
3806 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3807 warning("Disabling ProfileVMLocks since logging is turned off.");
3808 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3809 }
3810 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3811 warning("Disabling ProfileVMCalls since logging is turned off.");
3812 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3813 }
3814 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3815 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3816 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3817 }
3818 if (log_is_enabled(Info, perf, class, link)) {
3819 warning("Disabling -Xlog:perf+class+link since logging is turned off.");
3820 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3821 }
3822 }
3823 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3824 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3825 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3826 }
3827 }
3828
3829 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3830 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3831 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3832 }
3833 }
3834 return JNI_OK;
3835 }
3836
3837 jint Arguments::adjust_after_os() {
3838 if (UseNUMA) {
3839 if (UseParallelGC) {
3840 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3841 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3842 }
3843 }
3844 }
3845 return JNI_OK;
3846 }
3847
3848 int Arguments::PropertyList_count(SystemProperty* pl) {
3849 int count = 0;
3850 while(pl != nullptr) {
3851 count++;
3852 pl = pl->next();
3853 }
3854 return count;
3855 }
3856
3857 // Return the number of readable properties.
3858 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3859 int count = 0;
3860 while(pl != nullptr) {
3861 if (pl->readable()) {
3862 count++;
3863 }
3864 pl = pl->next();
3865 }
3866 return count;
3867 }
3868
3869 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3870 assert(key != nullptr, "just checking");
3871 SystemProperty* prop;
3872 for (prop = pl; prop != nullptr; prop = prop->next()) {
3873 if (strcmp(key, prop->key()) == 0) return prop->value();
3874 }
3875 return nullptr;
3876 }
3877
3878 // Return the value of the requested property provided that it is a readable property.
3879 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3880 assert(key != nullptr, "just checking");
3881 SystemProperty* prop;
3882 // Return the property value if the keys match and the property is not internal or
3883 // it's the special internal property "jdk.boot.class.path.append".
3884 for (prop = pl; prop != nullptr; prop = prop->next()) {
3885 if (strcmp(key, prop->key()) == 0) {
3886 if (!prop->internal()) {
3887 return prop->value();
3888 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3889 return prop->value();
3890 } else {
3891 // Property is internal and not jdk.boot.class.path.append so return null.
3892 return nullptr;
3893 }
3894 }
3895 }
3896 return nullptr;
3897 }
3898
3899 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3900 SystemProperty* p = *plist;
3901 if (p == nullptr) {
3902 *plist = new_p;
3903 } else {
3904 while (p->next() != nullptr) {
3905 p = p->next();
3906 }
3907 p->set_next(new_p);
3908 }
3909 }
3910
3911 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3912 bool writeable, bool internal) {
3913 if (plist == nullptr)
3914 return;
3915
3916 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3917 PropertyList_add(plist, new_p);
3918 }
3919
3920 void Arguments::PropertyList_add(SystemProperty *element) {
3921 PropertyList_add(&_system_properties, element);
3922 }
3923
3924 // This add maintains unique property key in the list.
3925 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3926 PropertyAppendable append, PropertyWriteable writeable,
3927 PropertyInternal internal) {
3928 if (plist == nullptr)
3929 return;
3930
3931 // If property key exists and is writeable, then update with new value.
3932 // Trying to update a non-writeable property is silently ignored.
3933 SystemProperty* prop;
3934 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3935 if (strcmp(k, prop->key()) == 0) {
3936 if (append == AppendProperty) {
3937 prop->append_writeable_value(v);
3938 } else {
3939 prop->set_writeable_value(v);
3940 }
3941 return;
3942 }
3943 }
3944
3945 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3946 }
3947
3948 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3949 // Returns true if all of the source pointed by src has been copied over to
3950 // the destination buffer pointed by buf. Otherwise, returns false.
3951 // Notes:
3952 // 1. If the length (buflen) of the destination buffer excluding the
3953 // null terminator character is not long enough for holding the expanded
3954 // pid characters, it also returns false instead of returning the partially
3955 // expanded one.
3956 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3957 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3958 char* buf, size_t buflen) {
3959 const char* p = src;
3960 char* b = buf;
3961 const char* src_end = &src[srclen];
3962 char* buf_end = &buf[buflen - 1];
3963
3964 while (p < src_end && b < buf_end) {
3965 if (*p == '%') {
3966 switch (*(++p)) {
3967 case '%': // "%%" ==> "%"
3968 *b++ = *p++;
3969 break;
3970 case 'p': { // "%p" ==> current process id
3971 // buf_end points to the character before the last character so
3972 // that we could write '\0' to the end of the buffer.
3973 size_t buf_sz = buf_end - b + 1;
3974 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3975
3976 // if jio_snprintf fails or the buffer is not long enough to hold
3977 // the expanded pid, returns false.
3978 if (ret < 0 || ret >= (int)buf_sz) {
3979 return false;
3980 } else {
3981 b += ret;
3982 assert(*b == '\0', "fail in copy_expand_pid");
3983 if (p == src_end && b == buf_end + 1) {
3984 // reach the end of the buffer.
3985 return true;
3986 }
3987 }
3988 p++;
3989 break;
3990 }
3991 default :
3992 *b++ = '%';
3993 }
3994 } else {
3995 *b++ = *p++;
3996 }
3997 }
3998 *b = '\0';
3999 return (p == src_end); // return false if not all of the source was copied
4000 }