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