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