1 /*
2 * Copyright (c) 1997, 2025, 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 "cds/aotLogging.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "cppstdlib/limits.hpp"
35 #include "gc/shared/gc_globals.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/genArguments.hpp"
39 #include "gc/shared/stringdedup/stringDedup.hpp"
40 #include "gc/shared/tlab_globals.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logConfiguration.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "nmt/nmtCommon.hpp"
48 #include "oops/compressedKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/objLayout.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "prims/jvmtiAgentList.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/flags/jvmFlag.hpp"
56 #include "runtime/flags/jvmFlagAccess.hpp"
57 #include "runtime/flags/jvmFlagLimit.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/os.hpp"
61 #include "runtime/safepoint.hpp"
62 #include "runtime/safepointMechanism.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/management.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/checkedCast.hpp"
68 #include "utilities/debug.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/macros.hpp"
71 #include "utilities/parseInteger.hpp"
72 #include "utilities/powerOfTwo.hpp"
73 #include "utilities/stringUtils.hpp"
74 #include "utilities/systemMemoryBarrier.hpp"
75 #if INCLUDE_JFR
76 #include "jfr/jfr.hpp"
77 #endif
78
79 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 unsigned int Arguments::_addmods_count = 0;
89 #if INCLUDE_JVMCI
90 bool Arguments::_jvmci_module_added = false;
91 #endif
92 char* Arguments::_java_command = nullptr;
93 SystemProperty* Arguments::_system_properties = nullptr;
94 size_t Arguments::_conservative_max_heap_alignment = 0;
95 Arguments::Mode Arguments::_mode = _mixed;
96 const char* Arguments::_java_vendor_url_bug = nullptr;
97 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
98 bool Arguments::_executing_unit_tests = false;
99
100 // These parameters are reset in method parse_vm_init_args()
101 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
102 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
103 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
104 bool Arguments::_ClipInlining = ClipInlining;
105 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
106
107 bool Arguments::_enable_preview = false;
108 bool Arguments::_has_jdwp_agent = false;
109
110 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
111
112 // These are not set by the JDK's built-in launchers, but they can be set by
113 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
114 // JavaVMOption in jni.h.
115 abort_hook_t Arguments::_abort_hook = nullptr;
116 exit_hook_t Arguments::_exit_hook = nullptr;
117 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
118
119
120 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
121 SystemProperty *Arguments::_java_library_path = nullptr;
122 SystemProperty *Arguments::_java_home = nullptr;
123 SystemProperty *Arguments::_java_class_path = nullptr;
124 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
125 SystemProperty *Arguments::_vm_info = nullptr;
126
127 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
128 PathString *Arguments::_boot_class_path = nullptr;
129 bool Arguments::_has_jimage = false;
130
131 char* Arguments::_ext_dirs = nullptr;
132
133 // True if -Xshare:auto option was specified.
134 static bool xshare_auto_cmd_line = false;
135
136 // True if -Xint/-Xmixed/-Xcomp were specified
137 static bool mode_flag_cmd_line = false;
138
139 struct VMInitArgsGroup {
140 const JavaVMInitArgs* _args;
141 JVMFlagOrigin _origin;
142 };
143
144 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
145 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
146 if (new_value == nullptr) {
147 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
148 return false;
149 }
150 if (_value != nullptr) {
151 FreeHeap(_value);
152 }
153 _value = new_value;
154 strcpy(_value, value);
155 return true;
156 }
157
158 void PathString::append_value(const char *value) {
159 char *sp;
160 size_t len = 0;
161 if (value != nullptr) {
162 len = strlen(value);
163 if (_value != nullptr) {
164 len += strlen(_value);
165 }
166 sp = AllocateHeap(len+2, mtArguments);
167 assert(sp != nullptr, "Unable to allocate space for new append path value");
168 if (sp != nullptr) {
169 if (_value != nullptr) {
170 strcpy(sp, _value);
171 strcat(sp, os::path_separator());
172 strcat(sp, value);
173 FreeHeap(_value);
174 } else {
175 strcpy(sp, value);
176 }
177 _value = sp;
178 }
179 }
180 }
181
182 PathString::PathString(const char* value) {
183 if (value == nullptr) {
184 _value = nullptr;
185 } else {
186 _value = AllocateHeap(strlen(value)+1, mtArguments);
187 strcpy(_value, value);
188 }
189 }
190
191 PathString::~PathString() {
192 if (_value != nullptr) {
193 FreeHeap(_value);
194 _value = nullptr;
195 }
196 }
197
198 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
199 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
200 size_t len = strlen(module_name) + 1;
201 _module_name = AllocateHeap(len, mtInternal);
202 strncpy(_module_name, module_name, len); // copy the trailing null
203 _path = new PathString(path);
204 }
205
206 ModulePatchPath::~ModulePatchPath() {
207 if (_module_name != nullptr) {
208 FreeHeap(_module_name);
209 _module_name = nullptr;
210 }
211 if (_path != nullptr) {
212 delete _path;
213 _path = nullptr;
214 }
215 }
216
217 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
218 if (key == nullptr) {
219 _key = nullptr;
220 } else {
221 _key = AllocateHeap(strlen(key)+1, mtArguments);
222 strcpy(_key, key);
223 }
224 _next = nullptr;
225 _internal = internal;
226 _writeable = writeable;
227 }
228
229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
230 // part of the option string.
231 static bool match_option(const JavaVMOption *option, const char* name,
232 const char** tail) {
233 size_t len = strlen(name);
234 if (strncmp(option->optionString, name, len) == 0) {
235 *tail = option->optionString + len;
236 return true;
237 } else {
238 return false;
239 }
240 }
241
242 // Check if 'option' matches 'name'. No "tail" is allowed.
243 static bool match_option(const JavaVMOption *option, const char* name) {
244 const char* tail = nullptr;
245 bool result = match_option(option, name, &tail);
246 if (tail != nullptr && *tail == '\0') {
247 return result;
248 } else {
249 return false;
250 }
251 }
252
253 // Return true if any of the strings in null-terminated array 'names' matches.
254 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
255 // the option must match exactly.
256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
257 bool tail_allowed) {
258 for (/* empty */; *names != nullptr; ++names) {
259 if (match_option(option, *names, tail)) {
260 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
261 return true;
262 }
263 }
264 }
265 return false;
266 }
267
268 #if INCLUDE_JFR
269 static bool _has_jfr_option = false; // is using JFR
270
271 // return true on failure
272 static bool match_jfr_option(const JavaVMOption** option) {
273 assert((*option)->optionString != nullptr, "invariant");
274 char* tail = nullptr;
275 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
276 _has_jfr_option = true;
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 _has_jfr_option = true;
280 return Jfr::on_flight_recorder_option(option, tail);
281 }
282 return false;
283 }
284
285 bool Arguments::has_jfr_option() {
286 return _has_jfr_option;
287 }
288 #endif
289
290 static void logOption(const char* opt) {
291 if (PrintVMOptions) {
292 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
293 }
294 }
295
296 bool needs_module_property_warning = false;
297
298 #define MODULE_PROPERTY_PREFIX "jdk.module."
299 #define MODULE_PROPERTY_PREFIX_LEN 11
300 #define ADDEXPORTS "addexports"
301 #define ADDEXPORTS_LEN 10
302 #define ADDREADS "addreads"
303 #define ADDREADS_LEN 8
304 #define ADDOPENS "addopens"
305 #define ADDOPENS_LEN 8
306 #define PATCH "patch"
307 #define PATCH_LEN 5
308 #define ADDMODS "addmods"
309 #define ADDMODS_LEN 7
310 #define LIMITMODS "limitmods"
311 #define LIMITMODS_LEN 9
312 #define PATH "path"
313 #define PATH_LEN 4
314 #define UPGRADE_PATH "upgrade.path"
315 #define UPGRADE_PATH_LEN 12
316 #define ENABLE_NATIVE_ACCESS "enable.native.access"
317 #define ENABLE_NATIVE_ACCESS_LEN 20
318 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
319 #define ILLEGAL_NATIVE_ACCESS_LEN 21
320
321 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
322 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
323 return ((strncmp(option, property, len) == 0) &&
324 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
325 }
326
327 // Return true if property starts with "jdk.module." and its ensuing chars match
328 // any of the reserved module properties.
329 // property should be passed without the leading "-D".
330 bool Arguments::is_internal_module_property(const char* property) {
331 return internal_module_property_helper(property, false);
332 }
333
334 // Returns true if property is one of those recognized by is_internal_module_property() but
335 // is not supported by CDS archived full module graph.
336 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
337 return internal_module_property_helper(property, true);
338 }
339
340 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
341 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
342 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
343 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
344 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
345 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
346 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
347 return true;
348 }
349
350 if (!check_for_cds) {
351 // CDS notes: these properties are supported by CDS archived full module graph.
352 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
353 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
354 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
355 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
356 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
357 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
358 return true;
359 }
360 }
361 }
362 return false;
363 }
364
365 // Process java launcher properties.
366 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
367 // See if sun.java.launcher is defined.
368 // Must do this before setting up other system properties,
369 // as some of them may depend on launcher type.
370 for (int index = 0; index < args->nOptions; index++) {
371 const JavaVMOption* option = args->options + index;
372 const char* tail;
373
374 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
375 process_java_launcher_argument(tail, option->extraInfo);
376 continue;
377 }
378 if (match_option(option, "-XX:+ExecutingUnitTests")) {
379 _executing_unit_tests = true;
380 continue;
381 }
382 }
383 }
384
385 // Initialize system properties key and value.
386 void Arguments::init_system_properties() {
387
388 // Set up _boot_class_path which is not a property but
389 // relies heavily on argument processing and the jdk.boot.class.path.append
390 // property. It is used to store the underlying boot class path.
391 _boot_class_path = new PathString(nullptr);
392
393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
394 "Java Virtual Machine Specification", false));
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
397 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
398
399 // Initialize the vm.info now, but it will need updating after argument parsing.
400 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
401
402 // Following are JVMTI agent writable properties.
403 // Properties values are set to nullptr and they are
404 // os specific they are initialized in os::init_system_properties_values().
405 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
406 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
407 _java_home = new SystemProperty("java.home", nullptr, true);
408 _java_class_path = new SystemProperty("java.class.path", "", true);
409 // jdk.boot.class.path.append is a non-writeable, internal property.
410 // It can only be set by either:
411 // - -Xbootclasspath/a:
412 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
413 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
414
415 // Add to System Property list.
416 PropertyList_add(&_system_properties, _sun_boot_library_path);
417 PropertyList_add(&_system_properties, _java_library_path);
418 PropertyList_add(&_system_properties, _java_home);
419 PropertyList_add(&_system_properties, _java_class_path);
420 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
421 PropertyList_add(&_system_properties, _vm_info);
422
423 // Set OS specific system properties values
424 os::init_system_properties_values();
425 }
426
427 // Update/Initialize System properties after JDK version number is known
428 void Arguments::init_version_specific_system_properties() {
429 enum { bufsz = 16 };
430 char buffer[bufsz];
431 const char* spec_vendor = "Oracle Corporation";
432 uint32_t spec_version = JDK_Version::current().major_version();
433
434 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
435
436 PropertyList_add(&_system_properties,
437 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.version", buffer, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
442 }
443
444 /*
445 * -XX argument processing:
446 *
447 * -XX arguments are defined in several places, such as:
448 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
449 * -XX arguments are parsed in parse_argument().
450 * -XX argument bounds checking is done in check_vm_args_consistency().
451 *
452 * Over time -XX arguments may change. There are mechanisms to handle common cases:
453 *
454 * ALIASED: An option that is simply another name for another option. This is often
455 * part of the process of deprecating a flag, but not all aliases need
456 * to be deprecated.
457 *
458 * Create an alias for an option by adding the old and new option names to the
459 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
460 *
461 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
462 * support may be removed in the future. Both regular and aliased options may be
463 * deprecated.
464 *
465 * Add a deprecation warning for an option (or alias) by adding an entry in the
466 * "special_jvm_flags" table and setting the "deprecated_in" field.
467 * Often an option "deprecated" in one major release will
468 * be made "obsolete" in the next. In this case the entry should also have its
469 * "obsolete_in" field set.
470 *
471 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
472 * on the command line. A warning is printed to let the user know that option might not
473 * be accepted in the future.
474 *
475 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
476 * table and setting the "obsolete_in" field.
477 *
478 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
479 * to the current JDK version. The system will flatly refuse to admit the existence of
480 * the flag. This allows a flag to die automatically over JDK releases.
481 *
482 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
483 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
484 * - Newly obsolete or expired deprecated options should have their global variable
485 * definitions removed (from globals.hpp, etc) and related implementations removed.
486 *
487 * Recommended approach for removing options:
488 *
489 * To remove options commonly used by customers (e.g. product -XX options), use
490 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
491 *
492 * To remove internal options (e.g. diagnostic, experimental, develop options), use
493 * a 2-step model adding major release numbers to the obsolete and expire columns.
494 *
495 * To change the name of an option, use the alias table as well as a 2-step
496 * model adding major release numbers to the deprecate and expire columns.
497 * Think twice about aliasing commonly used customer options.
498 *
499 * There are times when it is appropriate to leave a future release number as undefined.
500 *
501 * Tests: Aliases should be tested in VMAliasOptions.java.
502 * Deprecated options should be tested in VMDeprecatedOptions.java.
503 */
504
505 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
506 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
507 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
508 // the command-line as usual, but will issue a warning.
509 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
510 // the command-line, while issuing a warning and ignoring the flag value.
511 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
512 // existence of the flag.
513 //
514 // MANUAL CLEANUP ON JDK VERSION UPDATES:
515 // This table ensures that the handling of options will update automatically when the JDK
516 // version is incremented, but the source code needs to be cleanup up manually:
517 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
518 // variable should be removed, as well as users of the variable.
519 // - As "deprecated" options age into "obsolete" options, move the entry into the
520 // "Obsolete Flags" section of the table.
521 // - All expired options should be removed from the table.
522 static SpecialFlag const special_jvm_flags[] = {
523 // -------------- Deprecated Flags --------------
524 // --- Non-alias flags - sorted by obsolete_in then expired_in:
525 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
528 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
529 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
530 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
531 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
532 #ifdef _LP64
533 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
534 #endif
535 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
536 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
537 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
538 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
539 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
540 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
541 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
542 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
543 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
544
545 // -------------- Obsolete Flags - sorted by expired_in --------------
546
547 #ifdef LINUX
548 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
549 #endif
550 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
551 { "G1UpdateBufferSize", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
552 { "ShenandoahPacing", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
553 #if defined(AARCH64)
554 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
555 #endif
556
557 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
558 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
559 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
560 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
561 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
562 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
563 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
564 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
565 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
566 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
567 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
568 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
569 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
570 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
571 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
572 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
573
574 { "PretenureSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
575 { "HeapMaximumCompactionInterval",JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
576
577 #ifdef ASSERT
578 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
579 #endif
580
581 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
582 // These entries will generate build errors. Their purpose is to test the macros.
583 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
584 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
585 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
586 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
587 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
588 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
589 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
590 #endif
591
592 { nullptr, JDK_Version(0), JDK_Version(0) }
593 };
594
595 // Flags that are aliases for other flags.
596 typedef struct {
597 const char* alias_name;
598 const char* real_name;
599 } AliasedFlag;
600
601 static AliasedFlag const aliased_jvm_flags[] = {
602 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
603 { nullptr, nullptr}
604 };
605
606 // Return true if "v" is less than "other", where "other" may be "undefined".
607 static bool version_less_than(JDK_Version v, JDK_Version other) {
608 assert(!v.is_undefined(), "must be defined");
609 if (!other.is_undefined() && v.compare(other) >= 0) {
610 return false;
611 } else {
612 return true;
613 }
614 }
615
616 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
617 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
618 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
619 flag = special_jvm_flags[i];
620 return true;
621 }
622 }
623 return false;
624 }
625
626 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
627 assert(version != nullptr, "Must provide a version buffer");
628 SpecialFlag flag;
629 if (lookup_special_flag(flag_name, flag)) {
630 if (!flag.obsolete_in.is_undefined()) {
631 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
632 *version = flag.obsolete_in;
633 // This flag may have been marked for obsoletion in this version, but we may not
634 // have actually removed it yet. Rather than ignoring it as soon as we reach
635 // this version we allow some time for the removal to happen. So if the flag
636 // still actually exists we process it as normal, but issue an adjusted warning.
637 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
638 if (real_flag != nullptr) {
639 char version_str[256];
640 version->to_string(version_str, sizeof(version_str));
641 warning("Temporarily processing option %s; support is scheduled for removal in %s",
642 flag_name, version_str);
643 return false;
644 }
645 return true;
646 }
647 }
648 }
649 return false;
650 }
651
652 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
653 assert(version != nullptr, "Must provide a version buffer");
654 SpecialFlag flag;
655 if (lookup_special_flag(flag_name, flag)) {
656 if (!flag.deprecated_in.is_undefined()) {
657 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
658 version_less_than(JDK_Version::current(), flag.expired_in)) {
659 *version = flag.deprecated_in;
660 return 1;
661 } else {
662 return -1;
663 }
664 }
665 }
666 return 0;
667 }
668
669 const char* Arguments::real_flag_name(const char *flag_name) {
670 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
671 const AliasedFlag& flag_status = aliased_jvm_flags[i];
672 if (strcmp(flag_status.alias_name, flag_name) == 0) {
673 return flag_status.real_name;
674 }
675 }
676 return flag_name;
677 }
678
679 #ifdef ASSERT
680 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
681 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
682 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
683 return true;
684 }
685 }
686 return false;
687 }
688
689 // Verifies the correctness of the entries in the special_jvm_flags table.
690 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
691 // version being earlier than the deprecation version, then a warning is issued
692 // and verification fails - by returning false. If it is detected that the table
693 // is out of date, with respect to the current version, then ideally a warning is
694 // issued but verification does not fail. This allows the VM to operate when the
695 // version is first updated, without needing to update all the impacted flags at
696 // the same time. In practice we can't issue the warning immediately when the version
697 // is updated as it occurs for every test and some tests are not prepared to handle
698 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
699 // if the check_globals flag is true, and in addition allow a grace period and only
700 // check for stale flags when we hit build 25 (which is far enough into the 6 month
701 // release cycle that all flag updates should have been processed, whilst still
702 // leaving time to make the change before RDP2).
703 // We use a gtest to call this, passing true, so that we can detect stale flags before
704 // the end of the release cycle.
705
706 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
707
708 bool Arguments::verify_special_jvm_flags(bool check_globals) {
709 bool success = true;
710 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
711 const SpecialFlag& flag = special_jvm_flags[i];
712 if (lookup_special_flag(flag.name, i)) {
713 warning("Duplicate special flag declaration \"%s\"", flag.name);
714 success = false;
715 }
716 if (flag.deprecated_in.is_undefined() &&
717 flag.obsolete_in.is_undefined()) {
718 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
719 success = false;
720 }
721
722 if (!flag.deprecated_in.is_undefined()) {
723 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
724 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
725 success = false;
726 }
727
728 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
729 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
730 success = false;
731 }
732 }
733
734 if (!flag.obsolete_in.is_undefined()) {
735 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
736 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
737 success = false;
738 }
739
740 // if flag has become obsolete it should not have a "globals" flag defined anymore.
741 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
742 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
743 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
744 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
745 success = false;
746 }
747 }
748
749 } else if (!flag.expired_in.is_undefined()) {
750 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
751 success = false;
752 }
753
754 if (!flag.expired_in.is_undefined()) {
755 // if flag has become expired it should not have a "globals" flag defined anymore.
756 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
757 !version_less_than(JDK_Version::current(), flag.expired_in)) {
758 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
759 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
760 success = false;
761 }
762 }
763 }
764 }
765 return success;
766 }
767 #endif
768
769 bool Arguments::atojulong(const char *s, julong* result) {
770 return parse_integer(s, result);
771 }
772
773 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
774 if (size < min_size) return arg_too_small;
775 if (size > max_size) return arg_too_big;
776 return arg_in_range;
777 }
778
779 // Describe an argument out of range error
780 void Arguments::describe_range_error(ArgsRange errcode) {
781 switch(errcode) {
782 case arg_too_big:
783 jio_fprintf(defaultStream::error_stream(),
784 "The specified size exceeds the maximum "
785 "representable size.\n");
786 break;
787 case arg_too_small:
788 case arg_unreadable:
789 case arg_in_range:
790 // do nothing for now
791 break;
792 default:
793 ShouldNotReachHere();
794 }
795 }
796
797 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
798 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
799 return true;
800 } else {
801 return false;
802 }
803 }
804
805 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
806 // strtod allows leading whitespace, but our flag format does not.
807 if (*value == '\0' || isspace((unsigned char) *value)) {
808 return false;
809 }
810 char* end;
811 errno = 0;
812 double v = strtod(value, &end);
813 if ((errno != 0) || (*end != 0)) {
814 return false;
815 }
816 if (g_isnan(v) || !g_isfinite(v)) {
817 // Currently we cannot handle these special values.
818 return false;
819 }
820
821 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
822 return true;
823 }
824 return false;
825 }
826
827 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
828 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
829
830 if (flag->is_int()) {
831 int v;
832 if (parse_integer(value, &v)) {
833 result = JVMFlagAccess::set_int(flag, &v, origin);
834 }
835 } else if (flag->is_uint()) {
836 uint v;
837 if (parse_integer(value, &v)) {
838 result = JVMFlagAccess::set_uint(flag, &v, origin);
839 }
840 } else if (flag->is_intx()) {
841 intx v;
842 if (parse_integer(value, &v)) {
843 result = JVMFlagAccess::set_intx(flag, &v, origin);
844 }
845 } else if (flag->is_uintx()) {
846 uintx v;
847 if (parse_integer(value, &v)) {
848 result = JVMFlagAccess::set_uintx(flag, &v, origin);
849 }
850 } else if (flag->is_uint64_t()) {
851 uint64_t v;
852 if (parse_integer(value, &v)) {
853 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
854 }
855 } else if (flag->is_size_t()) {
856 size_t v;
857 if (parse_integer(value, &v)) {
858 result = JVMFlagAccess::set_size_t(flag, &v, origin);
859 }
860 }
861
862 return result == JVMFlag::SUCCESS;
863 }
864
865 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
866 if (value[0] == '\0') {
867 value = nullptr;
868 }
869 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
870 // Contract: JVMFlag always returns a pointer that needs freeing.
871 FREE_C_HEAP_ARRAY(char, value);
872 return true;
873 }
874
875 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
876 const char* old_value = "";
877 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
878 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
879 size_t new_len = strlen(new_value);
880 const char* value;
881 char* free_this_too = nullptr;
882 if (old_len == 0) {
883 value = new_value;
884 } else if (new_len == 0) {
885 value = old_value;
886 } else {
887 size_t length = old_len + 1 + new_len + 1;
888 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
889 // each new setting adds another LINE to the switch:
890 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
891 value = buf;
892 free_this_too = buf;
893 }
894 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
895 // JVMFlag always returns a pointer that needs freeing.
896 FREE_C_HEAP_ARRAY(char, value);
897 // JVMFlag made its own copy, so I must delete my own temp. buffer.
898 FREE_C_HEAP_ARRAY(char, free_this_too);
899 return true;
900 }
901
902 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
903 const char* real_name = real_flag_name(arg);
904 JDK_Version since = JDK_Version();
905 switch (is_deprecated_flag(arg, &since)) {
906 case -1: {
907 // Obsolete or expired, so don't process normally,
908 // but allow for an obsolete flag we're still
909 // temporarily allowing.
910 if (!is_obsolete_flag(arg, &since)) {
911 return real_name;
912 }
913 // Note if we're not considered obsolete then we can't be expired either
914 // as obsoletion must come first.
915 return nullptr;
916 }
917 case 0:
918 return real_name;
919 case 1: {
920 char version[256];
921 since.to_string(version, sizeof(version));
922 if (real_name != arg) {
923 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
924 arg, version, real_name);
925 } else {
926 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
927 arg, version);
928 }
929 return real_name;
930 }
931 }
932 ShouldNotReachHere();
933 return nullptr;
934 }
935
936 #define BUFLEN 255
937
938 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
939 char name_copied[BUFLEN+1];
940 if (name[name_length] != 0) {
941 if (name_length > BUFLEN) {
942 return nullptr;
943 } else {
944 strncpy(name_copied, name, name_length);
945 name_copied[name_length] = '\0';
946 name = name_copied;
947 }
948 }
949
950 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
951 if (real_name == nullptr) {
952 return nullptr;
953 }
954 JVMFlag* flag = JVMFlag::find_flag(real_name);
955 return flag;
956 }
957
958 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
959 bool is_bool = false;
960 bool bool_val = false;
961 char c = *arg;
962 if (c == '+' || c == '-') {
963 is_bool = true;
964 bool_val = (c == '+');
965 arg++;
966 }
967
968 const char* name = arg;
969 while (true) {
970 c = *arg;
971 if (isalnum(c) || (c == '_')) {
972 ++arg;
973 } else {
974 break;
975 }
976 }
977
978 size_t name_len = size_t(arg - name);
979 if (name_len == 0) {
980 return false;
981 }
982
983 JVMFlag* flag = find_jvm_flag(name, name_len);
984 if (flag == nullptr) {
985 return false;
986 }
987
988 if (is_bool) {
989 if (*arg != 0) {
990 // Error -- extra characters such as -XX:+BoolFlag=123
991 return false;
992 }
993 return set_bool_flag(flag, bool_val, origin);
994 }
995
996 if (arg[0] == '=') {
997 const char* value = arg + 1;
998 if (flag->is_ccstr()) {
999 if (flag->ccstr_accumulates()) {
1000 return append_to_string_flag(flag, value, origin);
1001 } else {
1002 return set_string_flag(flag, value, origin);
1003 }
1004 } else if (flag->is_double()) {
1005 return set_fp_numeric_flag(flag, value, origin);
1006 } else {
1007 return set_numeric_flag(flag, value, origin);
1008 }
1009 }
1010
1011 if (arg[0] == ':' && arg[1] == '=') {
1012 // -XX:Foo:=xxx will reset the string flag to the given value.
1013 const char* value = arg + 2;
1014 return set_string_flag(flag, value, origin);
1015 }
1016
1017 return false;
1018 }
1019
1020 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1021 assert(bldarray != nullptr, "illegal argument");
1022
1023 if (arg == nullptr) {
1024 return;
1025 }
1026
1027 int new_count = *count + 1;
1028
1029 // expand the array and add arg to the last element
1030 if (*bldarray == nullptr) {
1031 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1032 } else {
1033 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1034 }
1035 (*bldarray)[*count] = os::strdup_check_oom(arg);
1036 *count = new_count;
1037 }
1038
1039 void Arguments::build_jvm_args(const char* arg) {
1040 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1041 }
1042
1043 void Arguments::build_jvm_flags(const char* arg) {
1044 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1045 }
1046
1047 // utility function to return a string that concatenates all
1048 // strings in a given char** array
1049 const char* Arguments::build_resource_string(char** args, int count) {
1050 if (args == nullptr || count == 0) {
1051 return nullptr;
1052 }
1053 size_t length = 0;
1054 for (int i = 0; i < count; i++) {
1055 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1056 }
1057 char* s = NEW_RESOURCE_ARRAY(char, length);
1058 char* dst = s;
1059 for (int j = 0; j < count; j++) {
1060 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1061 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1062 dst += offset;
1063 length -= offset;
1064 }
1065 return (const char*) s;
1066 }
1067
1068 void Arguments::print_on(outputStream* st) {
1069 st->print_cr("VM Arguments:");
1070 if (num_jvm_flags() > 0) {
1071 st->print("jvm_flags: "); print_jvm_flags_on(st);
1072 st->cr();
1073 }
1074 if (num_jvm_args() > 0) {
1075 st->print("jvm_args: "); print_jvm_args_on(st);
1076 st->cr();
1077 }
1078 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1079 if (_java_class_path != nullptr) {
1080 char* path = _java_class_path->value();
1081 size_t len = strlen(path);
1082 st->print("java_class_path (initial): ");
1083 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1084 if (len == 0) {
1085 st->print_raw_cr("<not set>");
1086 } else {
1087 st->print_raw_cr(path, len);
1088 }
1089 }
1090 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1091 }
1092
1093 void Arguments::print_summary_on(outputStream* st) {
1094 // Print the command line. Environment variables that are helpful for
1095 // reproducing the problem are written later in the hs_err file.
1096 // flags are from setting file
1097 if (num_jvm_flags() > 0) {
1098 st->print_raw("Settings File: ");
1099 print_jvm_flags_on(st);
1100 st->cr();
1101 }
1102 // args are the command line and environment variable arguments.
1103 st->print_raw("Command Line: ");
1104 if (num_jvm_args() > 0) {
1105 print_jvm_args_on(st);
1106 }
1107 // this is the classfile and any arguments to the java program
1108 if (java_command() != nullptr) {
1109 st->print("%s", java_command());
1110 }
1111 st->cr();
1112 }
1113
1114 void Arguments::print_jvm_flags_on(outputStream* st) {
1115 if (_num_jvm_flags > 0) {
1116 for (int i=0; i < _num_jvm_flags; i++) {
1117 st->print("%s ", _jvm_flags_array[i]);
1118 }
1119 }
1120 }
1121
1122 void Arguments::print_jvm_args_on(outputStream* st) {
1123 if (_num_jvm_args > 0) {
1124 for (int i=0; i < _num_jvm_args; i++) {
1125 st->print("%s ", _jvm_args_array[i]);
1126 }
1127 }
1128 }
1129
1130 bool Arguments::process_argument(const char* arg,
1131 jboolean ignore_unrecognized,
1132 JVMFlagOrigin origin) {
1133 JDK_Version since = JDK_Version();
1134
1135 if (parse_argument(arg, origin)) {
1136 return true;
1137 }
1138
1139 // Determine if the flag has '+', '-', or '=' characters.
1140 bool has_plus_minus = (*arg == '+' || *arg == '-');
1141 const char* const argname = has_plus_minus ? arg + 1 : arg;
1142
1143 size_t arg_len;
1144 const char* equal_sign = strchr(argname, '=');
1145 if (equal_sign == nullptr) {
1146 arg_len = strlen(argname);
1147 } else {
1148 arg_len = equal_sign - argname;
1149 }
1150
1151 // Only make the obsolete check for valid arguments.
1152 if (arg_len <= BUFLEN) {
1153 // Construct a string which consists only of the argument name without '+', '-', or '='.
1154 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1155 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1156 if (is_obsolete_flag(stripped_argname, &since)) {
1157 char version[256];
1158 since.to_string(version, sizeof(version));
1159 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1160 return true;
1161 }
1162 }
1163
1164 // For locked flags, report a custom error message if available.
1165 // Otherwise, report the standard unrecognized VM option.
1166 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1167 if (found_flag != nullptr) {
1168 char locked_message_buf[BUFLEN];
1169 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1170 if (strlen(locked_message_buf) != 0) {
1171 #ifdef PRODUCT
1172 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1173 if (ignore_unrecognized && mismatched) {
1174 return true;
1175 }
1176 #endif
1177 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1178 }
1179 if (found_flag->is_bool() && !has_plus_minus) {
1180 jio_fprintf(defaultStream::error_stream(),
1181 "Missing +/- setting for VM option '%s'\n", argname);
1182 } else if (!found_flag->is_bool() && has_plus_minus) {
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Unexpected +/- setting in VM option '%s'\n", argname);
1185 } else {
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Improperly specified VM option '%s'\n", argname);
1188 }
1189 } else {
1190 if (ignore_unrecognized) {
1191 return true;
1192 }
1193 jio_fprintf(defaultStream::error_stream(),
1194 "Unrecognized VM option '%s'\n", argname);
1195 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1196 if (fuzzy_matched != nullptr) {
1197 jio_fprintf(defaultStream::error_stream(),
1198 "Did you mean '%s%s%s'?\n",
1199 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1200 fuzzy_matched->name(),
1201 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1202 }
1203 }
1204
1205 // allow for commandline "commenting out" options like -XX:#+Verbose
1206 return arg[0] == '#';
1207 }
1208
1209 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1210 FILE* stream = os::fopen(file_name, "rb");
1211 if (stream == nullptr) {
1212 if (should_exist) {
1213 jio_fprintf(defaultStream::error_stream(),
1214 "Could not open settings file %s\n", file_name);
1215 return false;
1216 } else {
1217 return true;
1218 }
1219 }
1220
1221 char token[1024];
1222 int pos = 0;
1223
1224 bool in_white_space = true;
1225 bool in_comment = false;
1226 bool in_quote = false;
1227 int quote_c = 0;
1228 bool result = true;
1229
1230 int c = getc(stream);
1231 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1232 if (in_white_space) {
1233 if (in_comment) {
1234 if (c == '\n') in_comment = false;
1235 } else {
1236 if (c == '#') in_comment = true;
1237 else if (!isspace((unsigned char) c)) {
1238 in_white_space = false;
1239 token[pos++] = checked_cast<char>(c);
1240 }
1241 }
1242 } else {
1243 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1244 // token ends at newline, or at unquoted whitespace
1245 // this allows a way to include spaces in string-valued options
1246 token[pos] = '\0';
1247 logOption(token);
1248 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1249 build_jvm_flags(token);
1250 pos = 0;
1251 in_white_space = true;
1252 in_quote = false;
1253 } else if (!in_quote && (c == '\'' || c == '"')) {
1254 in_quote = true;
1255 quote_c = c;
1256 } else if (in_quote && (c == quote_c)) {
1257 in_quote = false;
1258 } else {
1259 token[pos++] = checked_cast<char>(c);
1260 }
1261 }
1262 c = getc(stream);
1263 }
1264 if (pos > 0) {
1265 token[pos] = '\0';
1266 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1267 build_jvm_flags(token);
1268 }
1269 fclose(stream);
1270 return result;
1271 }
1272
1273 //=============================================================================================================
1274 // Parsing of properties (-D)
1275
1276 const char* Arguments::get_property(const char* key) {
1277 return PropertyList_get_value(system_properties(), key);
1278 }
1279
1280 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1281 const char* eq = strchr(prop, '=');
1282 const char* key;
1283 const char* value = "";
1284
1285 if (eq == nullptr) {
1286 // property doesn't have a value, thus use passed string
1287 key = prop;
1288 } else {
1289 // property have a value, thus extract it and save to the
1290 // allocated string
1291 size_t key_len = eq - prop;
1292 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1293
1294 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1295 key = tmp_key;
1296
1297 value = &prop[key_len + 1];
1298 }
1299
1300 if (internal == ExternalProperty) {
1301 CDSConfig::check_incompatible_property(key, value);
1302 }
1303
1304 if (strcmp(key, "java.compiler") == 0) {
1305 // we no longer support java.compiler system property, log a warning and let it get
1306 // passed to Java, like any other system property
1307 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1308 // for applications using NONE or empty value, log a more informative message
1309 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1310 } else {
1311 warning("The java.compiler system property is obsolete and no longer supported.");
1312 }
1313 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1314 // append is true, writable is true, internal is false
1315 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1316 WriteableProperty, ExternalProperty);
1317 } else {
1318 if (strcmp(key, "sun.java.command") == 0) {
1319 char *old_java_command = _java_command;
1320 _java_command = os::strdup_check_oom(value, mtArguments);
1321 if (old_java_command != nullptr) {
1322 os::free(old_java_command);
1323 }
1324 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1325 // If this property is set on the command line then its value will be
1326 // displayed in VM error logs as the URL at which to submit such logs.
1327 // Normally the URL displayed in error logs is different from the value
1328 // of this system property, so a different property should have been
1329 // used here, but we leave this as-is in case someone depends upon it.
1330 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1331 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1332 // its value without going through the property list or making a Java call.
1333 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1334 if (old_java_vendor_url_bug != nullptr) {
1335 os::free((void *)old_java_vendor_url_bug);
1336 }
1337 }
1338
1339 // Create new property and add at the end of the list
1340 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1341 }
1342
1343 if (key != prop) {
1344 // SystemProperty copy passed value, thus free previously allocated
1345 // memory
1346 FreeHeap((void *)key);
1347 }
1348
1349 return true;
1350 }
1351
1352 //===========================================================================================================
1353 // Setting int/mixed/comp mode flags
1354
1355 void Arguments::set_mode_flags(Mode mode) {
1356 // Set up default values for all flags.
1357 // If you add a flag to any of the branches below,
1358 // add a default value for it here.
1359 _mode = mode;
1360
1361 // Ensure Agent_OnLoad has the correct initial values.
1362 // This may not be the final mode; mode may change later in onload phase.
1363 PropertyList_unique_add(&_system_properties, "java.vm.info",
1364 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1365
1366 UseInterpreter = true;
1367 UseCompiler = true;
1368 UseLoopCounter = true;
1369
1370 // Default values may be platform/compiler dependent -
1371 // use the saved values
1372 ClipInlining = Arguments::_ClipInlining;
1373 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1374 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1375 BackgroundCompilation = Arguments::_BackgroundCompilation;
1376
1377 // Change from defaults based on mode
1378 switch (mode) {
1379 default:
1380 ShouldNotReachHere();
1381 break;
1382 case _int:
1383 UseCompiler = false;
1384 UseLoopCounter = false;
1385 AlwaysCompileLoopMethods = false;
1386 UseOnStackReplacement = false;
1387 break;
1388 case _mixed:
1389 // same as default
1390 break;
1391 case _comp:
1392 UseInterpreter = false;
1393 BackgroundCompilation = false;
1394 ClipInlining = false;
1395 break;
1396 }
1397 }
1398
1399 // Conflict: required to use shared spaces (-Xshare:on), but
1400 // incompatible command line options were chosen.
1401 void Arguments::no_shared_spaces(const char* message) {
1402 if (RequireSharedSpaces) {
1403 aot_log_error(aot)("%s is incompatible with other specified options.",
1404 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1405 if (CDSConfig::new_aot_flags_used()) {
1406 vm_exit_during_initialization("Unable to use AOT cache", message);
1407 } else {
1408 vm_exit_during_initialization("Unable to use shared archive", message);
1409 }
1410 } else {
1411 if (CDSConfig::new_aot_flags_used()) {
1412 log_warning(aot)("Unable to use AOT cache: %s", message);
1413 } else {
1414 aot_log_info(aot)("Unable to use shared archive: %s", message);
1415 }
1416 UseSharedSpaces = false;
1417 }
1418 }
1419
1420 static void set_object_alignment() {
1421 // Object alignment.
1422 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1423 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1424 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1425 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1426 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1427 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1428
1429 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1430 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1431
1432 // Oop encoding heap max
1433 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1434 }
1435
1436 size_t Arguments::max_heap_for_compressed_oops() {
1437 // Avoid sign flip.
1438 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1439 // We need to fit both the null page and the heap into the memory budget, while
1440 // keeping alignment constraints of the heap. To guarantee the latter, as the
1441 // null page is located before the heap, we pad the null page to the conservative
1442 // maximum alignment that the GC may ever impose upon the heap.
1443 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1444 _conservative_max_heap_alignment);
1445
1446 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1447 NOT_LP64(ShouldNotReachHere(); return 0);
1448 }
1449
1450 void Arguments::set_use_compressed_oops() {
1451 #ifdef _LP64
1452 // MaxHeapSize is not set up properly at this point, but
1453 // the only value that can override MaxHeapSize if we are
1454 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1455 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1456
1457 if (max_heap_size <= max_heap_for_compressed_oops()) {
1458 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1459 FLAG_SET_ERGO(UseCompressedOops, true);
1460 }
1461 } else {
1462 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1463 warning("Max heap size too large for Compressed Oops");
1464 FLAG_SET_DEFAULT(UseCompressedOops, false);
1465 }
1466 }
1467 #endif // _LP64
1468 }
1469
1470 void Arguments::set_conservative_max_heap_alignment() {
1471 // The conservative maximum required alignment for the heap is the maximum of
1472 // the alignments imposed by several sources: any requirements from the heap
1473 // itself and the maximum page size we may run the VM with.
1474 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1475 _conservative_max_heap_alignment = MAX4(heap_alignment,
1476 os::vm_allocation_granularity(),
1477 os::max_page_size(),
1478 GCArguments::compute_heap_alignment());
1479 }
1480
1481 jint Arguments::set_ergonomics_flags() {
1482 GCConfig::initialize();
1483
1484 set_conservative_max_heap_alignment();
1485
1486 #ifdef _LP64
1487 set_use_compressed_oops();
1488
1489 // Also checks that certain machines are slower with compressed oops
1490 // in vm_version initialization code.
1491 #endif // _LP64
1492
1493 return JNI_OK;
1494 }
1495
1496 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1497 // The AggressiveHeap check is a temporary workaround to avoid calling
1498 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1499 // selected. This works because AggressiveHeap implies UseParallelGC
1500 // where we know the ratio will be 1. Once the AggressiveHeap option is
1501 // removed, this can be cleaned up.
1502 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1503 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1504 size_t max_allocatable = os::commit_memory_limit();
1505
1506 return MIN2(limit, max_allocatable / fraction);
1507 }
1508
1509 // Use static initialization to get the default before parsing
1510 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1511
1512 static size_t clamp_by_size_t_max(uint64_t value) {
1513 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1514 }
1515
1516 void Arguments::set_heap_size() {
1517 // Check if the user has configured any limit on the amount of RAM we may use.
1518 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1519 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1520 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1521 !FLAG_IS_DEFAULT(MaxRAM);
1522
1523 if (FLAG_IS_DEFAULT(MaxRAM)) {
1524 if (CompilerConfig::should_set_client_emulation_mode_flags()) {
1525 // Limit the available memory if client emulation mode is enabled.
1526 FLAG_SET_ERGO(MaxRAM, 1ULL*G);
1527 } else {
1528 // Use the available physical memory on the system.
1529 FLAG_SET_ERGO(MaxRAM, os::physical_memory());
1530 }
1531 }
1532
1533 // If the maximum heap size has not been set with -Xmx, then set it as
1534 // fraction of the size of physical memory, respecting the maximum and
1535 // minimum sizes of the heap.
1536 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1537 uint64_t min_memory = (uint64_t)(((double)MaxRAM * MinRAMPercentage) / 100);
1538 uint64_t max_memory = (uint64_t)(((double)MaxRAM * MaxRAMPercentage) / 100);
1539
1540 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1541 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1542
1543 if (reasonable_min < MaxHeapSize) {
1544 // Small physical memory, so use a minimum fraction of it for the heap
1545 reasonable_max = reasonable_min;
1546 } else {
1547 // Not-small physical memory, so require a heap at least
1548 // as large as MaxHeapSize
1549 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1550 }
1551
1552 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1553 // Limit the heap size to ErgoHeapSizeLimit
1554 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1555 }
1556
1557 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1558
1559 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1560 // An initial heap size was specified on the command line,
1561 // so be sure that the maximum size is consistent. Done
1562 // after call to limit_heap_by_allocatable_memory because that
1563 // method might reduce the allocation size.
1564 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1565 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1566 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1567 }
1568
1569 #ifdef _LP64
1570 if (UseCompressedOops || UseCompressedClassPointers) {
1571 // HeapBaseMinAddress can be greater than default but not less than.
1572 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1573 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1574 // matches compressed oops printing flags
1575 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1576 "(%zuG) which is greater than value given %zu",
1577 DefaultHeapBaseMinAddress,
1578 DefaultHeapBaseMinAddress/G,
1579 HeapBaseMinAddress);
1580 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1581 }
1582 }
1583 }
1584
1585 if (UseCompressedOops) {
1586 size_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1587 size_t max_coop_heap = max_heap_for_compressed_oops();
1588
1589 // Limit the heap size to the maximum possible when using compressed oops
1590 if (heap_end < max_coop_heap) {
1591 // Heap should be above HeapBaseMinAddress to get zero based compressed
1592 // oops but it should be not less than default MaxHeapSize.
1593 max_coop_heap -= HeapBaseMinAddress;
1594 }
1595
1596 // If the user has configured any limit on the amount of RAM we may use,
1597 // then disable compressed oops if the calculated max exceeds max_coop_heap
1598 // and UseCompressedOops was not specified.
1599 if (reasonable_max > max_coop_heap) {
1600 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1601 aot_log_info(aot)("UseCompressedOops disabled due to "
1602 "max heap %zu > compressed oop heap %zu. "
1603 "Please check the setting of MaxRAMPercentage %5.2f.",
1604 reasonable_max, max_coop_heap, MaxRAMPercentage);
1605 FLAG_SET_ERGO(UseCompressedOops, false);
1606 } else {
1607 reasonable_max = max_coop_heap;
1608 }
1609 }
1610 }
1611 #endif // _LP64
1612
1613 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1614 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1615 }
1616
1617 // If the minimum or initial heap_size have not been set or requested to be set
1618 // ergonomically, set them accordingly.
1619 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1620 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1621 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1622 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1623
1624 if (InitialHeapSize == 0) {
1625 uint64_t initial_memory = (uint64_t)(((double)MaxRAM * InitialRAMPercentage) / 100);
1626 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1627 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1628
1629 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1630 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1631
1632 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1633 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1634 }
1635
1636 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1637 // synchronize with InitialHeapSize to avoid errors with the default value.
1638 if (MinHeapSize == 0) {
1639 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1640 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1641 }
1642 }
1643 }
1644
1645 // This option inspects the machine and attempts to set various
1646 // parameters to be optimal for long-running, memory allocation
1647 // intensive jobs. It is intended for machines with large
1648 // amounts of cpu and memory.
1649 jint Arguments::set_aggressive_heap_flags() {
1650 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1651 // VM, but we may not be able to represent the total physical memory
1652 // available (like having 8gb of memory on a box but using a 32bit VM).
1653 // Thus, we need to make sure we're using a julong for intermediate
1654 // calculations.
1655 julong initHeapSize;
1656 physical_memory_size_type phys_mem = os::physical_memory();
1657 julong total_memory = static_cast<julong>(phys_mem);
1658
1659 if (total_memory < (julong) 256 * M) {
1660 jio_fprintf(defaultStream::error_stream(),
1661 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1662 vm_exit(1);
1663 }
1664
1665 // The heap size is half of available memory, or (at most)
1666 // all of possible memory less 160mb (leaving room for the OS
1667 // when using ISM). This is the maximum; because adaptive sizing
1668 // is turned on below, the actual space used may be smaller.
1669
1670 initHeapSize = MIN2(total_memory / (julong) 2,
1671 total_memory - (julong) 160 * M);
1672
1673 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1674
1675 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1676 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1677 return JNI_EINVAL;
1678 }
1679 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1680 return JNI_EINVAL;
1681 }
1682 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1683 return JNI_EINVAL;
1684 }
1685 }
1686 if (FLAG_IS_DEFAULT(NewSize)) {
1687 // Make the young generation 3/8ths of the total heap.
1688 if (FLAG_SET_CMDLINE(NewSize,
1689 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1690 return JNI_EINVAL;
1691 }
1692 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1693 return JNI_EINVAL;
1694 }
1695 }
1696
1697 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1698 FLAG_SET_DEFAULT(UseLargePages, true);
1699 #endif
1700
1701 // Increase some data structure sizes for efficiency
1702 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1703 return JNI_EINVAL;
1704 }
1705 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1706 return JNI_EINVAL;
1707 }
1708
1709 // See the OldPLABSize comment below, but replace 'after promotion'
1710 // with 'after copying'. YoungPLABSize is the size of the survivor
1711 // space per-gc-thread buffers. The default is 4kw.
1712 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1713 return JNI_EINVAL;
1714 }
1715
1716 // OldPLABSize is the size of the buffers in the old gen that
1717 // UseParallelGC uses to promote live data that doesn't fit in the
1718 // survivor spaces. At any given time, there's one for each gc thread.
1719 // The default size is 1kw. These buffers are rarely used, since the
1720 // survivor spaces are usually big enough. For specjbb, however, there
1721 // are occasions when there's lots of live data in the young gen
1722 // and we end up promoting some of it. We don't have a definite
1723 // explanation for why bumping OldPLABSize helps, but the theory
1724 // is that a bigger PLAB results in retaining something like the
1725 // original allocation order after promotion, which improves mutator
1726 // locality. A minor effect may be that larger PLABs reduce the
1727 // number of PLAB allocation events during gc. The value of 8kw
1728 // was arrived at by experimenting with specjbb.
1729 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1730 return JNI_EINVAL;
1731 }
1732
1733 // Enable parallel GC and adaptive generation sizing
1734 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1735 return JNI_EINVAL;
1736 }
1737
1738 // Encourage steady state memory management
1739 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1740 return JNI_EINVAL;
1741 }
1742
1743 return JNI_OK;
1744 }
1745
1746 // This must be called after ergonomics.
1747 void Arguments::set_bytecode_flags() {
1748 if (!RewriteBytecodes) {
1749 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1750 }
1751 }
1752
1753 // Aggressive optimization flags
1754 jint Arguments::set_aggressive_opts_flags() {
1755 #ifdef COMPILER2
1756 if (AggressiveUnboxing) {
1757 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1758 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1759 } else if (!EliminateAutoBox) {
1760 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1761 AggressiveUnboxing = false;
1762 }
1763 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1764 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1765 } else if (!DoEscapeAnalysis) {
1766 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1767 AggressiveUnboxing = false;
1768 }
1769 }
1770 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1771 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1772 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1773 }
1774 // Feed the cache size setting into the JDK
1775 char buffer[1024];
1776 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1777 if (!add_property(buffer)) {
1778 return JNI_ENOMEM;
1779 }
1780 }
1781 #endif
1782
1783 return JNI_OK;
1784 }
1785
1786 //===========================================================================================================
1787
1788 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1789 if (_sun_java_launcher != _default_java_launcher) {
1790 os::free(const_cast<char*>(_sun_java_launcher));
1791 }
1792 _sun_java_launcher = os::strdup_check_oom(launcher);
1793 }
1794
1795 bool Arguments::created_by_java_launcher() {
1796 assert(_sun_java_launcher != nullptr, "property must have value");
1797 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1798 }
1799
1800 bool Arguments::executing_unit_tests() {
1801 return _executing_unit_tests;
1802 }
1803
1804 //===========================================================================================================
1805 // Parsing of main arguments
1806
1807 static unsigned int addreads_count = 0;
1808 static unsigned int addexports_count = 0;
1809 static unsigned int addopens_count = 0;
1810 static unsigned int patch_mod_count = 0;
1811 static unsigned int enable_native_access_count = 0;
1812 static bool patch_mod_javabase = false;
1813
1814 // Check the consistency of vm_init_args
1815 bool Arguments::check_vm_args_consistency() {
1816 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1817 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1818 return false;
1819 }
1820
1821 // Method for adding checks for flag consistency.
1822 // The intent is to warn the user of all possible conflicts,
1823 // before returning an error.
1824 // Note: Needs platform-dependent factoring.
1825 bool status = true;
1826
1827 if (TLABRefillWasteFraction == 0) {
1828 jio_fprintf(defaultStream::error_stream(),
1829 "TLABRefillWasteFraction should be a denominator, "
1830 "not %zu\n",
1831 TLABRefillWasteFraction);
1832 status = false;
1833 }
1834
1835 status = CompilerConfig::check_args_consistency(status);
1836 #if INCLUDE_JVMCI
1837 if (status && EnableJVMCI) {
1838 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1839 // was explicitly set on the command line or in the jimage.
1840 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1841 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1842 return false;
1843 }
1844 }
1845 }
1846 #endif
1847
1848 #if INCLUDE_JFR
1849 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1850 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1851 return false;
1852 }
1853 }
1854 #endif
1855
1856 #ifndef SUPPORT_RESERVED_STACK_AREA
1857 if (StackReservedPages != 0) {
1858 FLAG_SET_CMDLINE(StackReservedPages, 0);
1859 warning("Reserved Stack Area not supported on this platform");
1860 }
1861 #endif
1862
1863 return status;
1864 }
1865
1866 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1867 const char* option_type) {
1868 if (ignore) return false;
1869
1870 const char* spacer = " ";
1871 if (option_type == nullptr) {
1872 option_type = ++spacer; // Set both to the empty string.
1873 }
1874
1875 jio_fprintf(defaultStream::error_stream(),
1876 "Unrecognized %s%soption: %s\n", option_type, spacer,
1877 option->optionString);
1878 return true;
1879 }
1880
1881 static const char* user_assertion_options[] = {
1882 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1883 };
1884
1885 static const char* system_assertion_options[] = {
1886 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1887 };
1888
1889 bool Arguments::parse_uint(const char* value,
1890 uint* uint_arg,
1891 uint min_size) {
1892 uint n;
1893 if (!parse_integer(value, &n)) {
1894 return false;
1895 }
1896 if (n >= min_size) {
1897 *uint_arg = n;
1898 return true;
1899 } else {
1900 return false;
1901 }
1902 }
1903
1904 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1905 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1906 CDSConfig::check_internal_module_property(prop_name, prop_value);
1907 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1908 char* property = AllocateHeap(prop_len, mtArguments);
1909 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1910 if (ret < 0 || ret >= (int)prop_len) {
1911 FreeHeap(property);
1912 return false;
1913 }
1914 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1915 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1916 // that multiple occurrences of the associated flag just causes the existing property value to be
1917 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1918 // to a property after we have finished flag processing.
1919 bool added = add_property(property, WriteableProperty, internal);
1920 FreeHeap(property);
1921 return added;
1922 }
1923
1924 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1925 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1926 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1927 const unsigned int props_count_limit = 1000;
1928 const int max_digits = 3;
1929 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1930
1931 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1932 if (count < props_count_limit) {
1933 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1934 char* property = AllocateHeap(prop_len, mtArguments);
1935 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1936 if (ret < 0 || ret >= (int)prop_len) {
1937 FreeHeap(property);
1938 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1939 return false;
1940 }
1941 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1942 FreeHeap(property);
1943 return added;
1944 }
1945
1946 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1947 return false;
1948 }
1949
1950 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1951 julong* long_arg,
1952 julong min_size,
1953 julong max_size) {
1954 if (!parse_integer(s, long_arg)) return arg_unreadable;
1955 return check_memory_size(*long_arg, min_size, max_size);
1956 }
1957
1958 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1959 // Save default settings for some mode flags
1960 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1961 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1962 Arguments::_ClipInlining = ClipInlining;
1963 Arguments::_BackgroundCompilation = BackgroundCompilation;
1964
1965 // Remember the default value of SharedBaseAddress.
1966 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1967
1968 // Setup flags for mixed which is the default
1969 set_mode_flags(_mixed);
1970
1971 jint result;
1972 for (int i = 0; i < all_args->length(); i++) {
1973 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1974 if (result != JNI_OK) {
1975 return result;
1976 }
1977 }
1978
1979 // Disable CDS for exploded image
1980 if (!has_jimage()) {
1981 no_shared_spaces("CDS disabled on exploded JDK");
1982 }
1983
1984 // We need to ensure processor and memory resources have been properly
1985 // configured - which may rely on arguments we just processed - before
1986 // doing the final argument processing. Any argument processing that
1987 // needs to know about processor and memory resources must occur after
1988 // this point.
1989
1990 os::init_container_support();
1991
1992 SystemMemoryBarrier::initialize();
1993
1994 // Do final processing now that all arguments have been parsed
1995 result = finalize_vm_init_args();
1996 if (result != JNI_OK) {
1997 return result;
1998 }
1999
2000 return JNI_OK;
2001 }
2002
2003 #if !INCLUDE_JVMTI || INCLUDE_CDS
2004 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2005 // represents a valid JDWP agent. is_path==true denotes that we
2006 // are dealing with -agentpath (case where name is a path), otherwise with
2007 // -agentlib
2008 static bool valid_jdwp_agent(char *name, bool is_path) {
2009 char *_name;
2010 const char *_jdwp = "jdwp";
2011 size_t _len_jdwp, _len_prefix;
2012
2013 if (is_path) {
2014 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2015 return false;
2016 }
2017
2018 _name++; // skip past last path separator
2019 _len_prefix = strlen(JNI_LIB_PREFIX);
2020
2021 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2022 return false;
2023 }
2024
2025 _name += _len_prefix;
2026 _len_jdwp = strlen(_jdwp);
2027
2028 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2029 _name += _len_jdwp;
2030 }
2031 else {
2032 return false;
2033 }
2034
2035 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2036 return false;
2037 }
2038
2039 return true;
2040 }
2041
2042 if (strcmp(name, _jdwp) == 0) {
2043 return true;
2044 }
2045
2046 return false;
2047 }
2048 #endif
2049
2050 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2051 // --patch-module=<module>=<file>(<pathsep><file>)*
2052 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2053 // Find the equal sign between the module name and the path specification
2054 const char* module_equal = strchr(patch_mod_tail, '=');
2055 if (module_equal == nullptr) {
2056 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2057 return JNI_ERR;
2058 } else {
2059 // Pick out the module name
2060 size_t module_len = module_equal - patch_mod_tail;
2061 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2062 if (module_name != nullptr) {
2063 memcpy(module_name, patch_mod_tail, module_len);
2064 *(module_name + module_len) = '\0';
2065 // The path piece begins one past the module_equal sign
2066 add_patch_mod_prefix(module_name, module_equal + 1);
2067 FREE_C_HEAP_ARRAY(char, module_name);
2068 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2069 return JNI_ENOMEM;
2070 }
2071 } else {
2072 return JNI_ENOMEM;
2073 }
2074 }
2075 return JNI_OK;
2076 }
2077
2078 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2079 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2080 // The min and max sizes match the values in globals.hpp, but scaled
2081 // with K. The values have been chosen so that alignment with page
2082 // size doesn't change the max value, which makes the conversions
2083 // back and forth between Xss value and ThreadStackSize value easier.
2084 // The values have also been chosen to fit inside a 32-bit signed type.
2085 const julong min_ThreadStackSize = 0;
2086 const julong max_ThreadStackSize = 1 * M;
2087
2088 // Make sure the above values match the range set in globals.hpp
2089 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2090 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2091 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2092
2093 const julong min_size = min_ThreadStackSize * K;
2094 const julong max_size = max_ThreadStackSize * K;
2095
2096 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2097
2098 julong size = 0;
2099 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2100 if (errcode != arg_in_range) {
2101 bool silent = (option == nullptr); // Allow testing to silence error messages
2102 if (!silent) {
2103 jio_fprintf(defaultStream::error_stream(),
2104 "Invalid thread stack size: %s\n", option->optionString);
2105 describe_range_error(errcode);
2106 }
2107 return JNI_EINVAL;
2108 }
2109
2110 // Internally track ThreadStackSize in units of 1024 bytes.
2111 const julong size_aligned = align_up(size, K);
2112 assert(size <= size_aligned,
2113 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2114 size, size_aligned);
2115
2116 const julong size_in_K = size_aligned / K;
2117 assert(size_in_K < (julong)max_intx,
2118 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2119 size_in_K);
2120
2121 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2122 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2123 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2124 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2125 max_expanded, size_in_K);
2126
2127 *out_ThreadStackSize = (intx)size_in_K;
2128
2129 return JNI_OK;
2130 }
2131
2132 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2133 // For match_option to return remaining or value part of option string
2134 const char* tail;
2135
2136 // iterate over arguments
2137 for (int index = 0; index < args->nOptions; index++) {
2138 bool is_absolute_path = false; // for -agentpath vs -agentlib
2139
2140 const JavaVMOption* option = args->options + index;
2141
2142 if (!match_option(option, "-Djava.class.path", &tail) &&
2143 !match_option(option, "-Dsun.java.command", &tail) &&
2144 !match_option(option, "-Dsun.java.launcher", &tail)) {
2145
2146 // add all jvm options to the jvm_args string. This string
2147 // is used later to set the java.vm.args PerfData string constant.
2148 // the -Djava.class.path and the -Dsun.java.command options are
2149 // omitted from jvm_args string as each have their own PerfData
2150 // string constant object.
2151 build_jvm_args(option->optionString);
2152 }
2153
2154 // -verbose:[class/module/gc/jni]
2155 if (match_option(option, "-verbose", &tail)) {
2156 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2157 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2158 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2159 } else if (!strcmp(tail, ":module")) {
2160 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2161 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2162 } else if (!strcmp(tail, ":gc")) {
2163 if (_legacyGCLogging.lastFlag == 0) {
2164 _legacyGCLogging.lastFlag = 1;
2165 }
2166 } else if (!strcmp(tail, ":jni")) {
2167 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2168 }
2169 // -da / -ea / -disableassertions / -enableassertions
2170 // These accept an optional class/package name separated by a colon, e.g.,
2171 // -da:java.lang.Thread.
2172 } else if (match_option(option, user_assertion_options, &tail, true)) {
2173 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2174 if (*tail == '\0') {
2175 JavaAssertions::setUserClassDefault(enable);
2176 } else {
2177 assert(*tail == ':', "bogus match by match_option()");
2178 JavaAssertions::addOption(tail + 1, enable);
2179 }
2180 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2181 } else if (match_option(option, system_assertion_options, &tail, false)) {
2182 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2183 JavaAssertions::setSystemClassDefault(enable);
2184 // -bootclasspath:
2185 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2186 jio_fprintf(defaultStream::output_stream(),
2187 "-Xbootclasspath is no longer a supported option.\n");
2188 return JNI_EINVAL;
2189 // -bootclasspath/a:
2190 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2191 Arguments::append_sysclasspath(tail);
2192 // -bootclasspath/p:
2193 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2194 jio_fprintf(defaultStream::output_stream(),
2195 "-Xbootclasspath/p is no longer a supported option.\n");
2196 return JNI_EINVAL;
2197 // -Xrun
2198 } else if (match_option(option, "-Xrun", &tail)) {
2199 if (tail != nullptr) {
2200 const char* pos = strchr(tail, ':');
2201 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2202 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2203 jio_snprintf(name, len + 1, "%s", tail);
2204
2205 char *options = nullptr;
2206 if(pos != nullptr) {
2207 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2208 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2209 }
2210 #if !INCLUDE_JVMTI
2211 if (strcmp(name, "jdwp") == 0) {
2212 jio_fprintf(defaultStream::error_stream(),
2213 "Debugging agents are not supported in this VM\n");
2214 return JNI_ERR;
2215 }
2216 #endif // !INCLUDE_JVMTI
2217 JvmtiAgentList::add_xrun(name, options, false);
2218 FREE_C_HEAP_ARRAY(char, name);
2219 FREE_C_HEAP_ARRAY(char, options);
2220 }
2221 } else if (match_option(option, "--add-reads=", &tail)) {
2222 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2223 return JNI_ENOMEM;
2224 }
2225 } else if (match_option(option, "--add-exports=", &tail)) {
2226 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2227 return JNI_ENOMEM;
2228 }
2229 } else if (match_option(option, "--add-opens=", &tail)) {
2230 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2231 return JNI_ENOMEM;
2232 }
2233 } else if (match_option(option, "--add-modules=", &tail)) {
2234 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2235 return JNI_ENOMEM;
2236 }
2237 #if INCLUDE_JVMCI
2238 if (!_jvmci_module_added) {
2239 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2240 if (jvmci_module != nullptr) {
2241 char before = *(jvmci_module - 1);
2242 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2243 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2244 FLAG_SET_DEFAULT(EnableJVMCI, true);
2245 _jvmci_module_added = true;
2246 }
2247 }
2248 }
2249 #endif
2250 } else if (match_option(option, "--enable-native-access=", &tail)) {
2251 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2252 return JNI_ENOMEM;
2253 }
2254 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2255 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2256 return JNI_ENOMEM;
2257 }
2258 } else if (match_option(option, "--limit-modules=", &tail)) {
2259 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2260 return JNI_ENOMEM;
2261 }
2262 } else if (match_option(option, "--module-path=", &tail)) {
2263 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2264 return JNI_ENOMEM;
2265 }
2266 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2267 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2268 return JNI_ENOMEM;
2269 }
2270 } else if (match_option(option, "--patch-module=", &tail)) {
2271 // --patch-module=<module>=<file>(<pathsep><file>)*
2272 int res = process_patch_mod_option(tail);
2273 if (res != JNI_OK) {
2274 return res;
2275 }
2276 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2277 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2278 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2279 AddProperty, WriteableProperty, InternalProperty);
2280 } else {
2281 jio_fprintf(defaultStream::error_stream(),
2282 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2283 return JNI_ERR;
2284 }
2285 } else if (match_option(option, "--illegal-access=", &tail)) {
2286 char version[256];
2287 JDK_Version::jdk(17).to_string(version, sizeof(version));
2288 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2289 // -agentlib and -agentpath
2290 } else if (match_option(option, "-agentlib:", &tail) ||
2291 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2292 if(tail != nullptr) {
2293 const char* pos = strchr(tail, '=');
2294 char* name;
2295 if (pos == nullptr) {
2296 name = os::strdup_check_oom(tail, mtArguments);
2297 } else {
2298 size_t len = pos - tail;
2299 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2300 memcpy(name, tail, len);
2301 name[len] = '\0';
2302 }
2303
2304 char *options = nullptr;
2305 if(pos != nullptr) {
2306 options = os::strdup_check_oom(pos + 1, mtArguments);
2307 }
2308 #if !INCLUDE_JVMTI
2309 if (valid_jdwp_agent(name, is_absolute_path)) {
2310 jio_fprintf(defaultStream::error_stream(),
2311 "Debugging agents are not supported in this VM\n");
2312 return JNI_ERR;
2313 }
2314 #elif INCLUDE_CDS
2315 if (valid_jdwp_agent(name, is_absolute_path)) {
2316 _has_jdwp_agent = true;
2317 }
2318 #endif // !INCLUDE_JVMTI
2319 JvmtiAgentList::add(name, options, is_absolute_path);
2320 os::free(name);
2321 os::free(options);
2322 }
2323 // -javaagent
2324 } else if (match_option(option, "-javaagent:", &tail)) {
2325 #if !INCLUDE_JVMTI
2326 jio_fprintf(defaultStream::error_stream(),
2327 "Instrumentation agents are not supported in this VM\n");
2328 return JNI_ERR;
2329 #else
2330 if (tail != nullptr) {
2331 size_t length = strlen(tail) + 1;
2332 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2333 jio_snprintf(options, length, "%s", tail);
2334 JvmtiAgentList::add("instrument", options, false);
2335 FREE_C_HEAP_ARRAY(char, options);
2336
2337 // java agents need module java.instrument
2338 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2339 return JNI_ENOMEM;
2340 }
2341 }
2342 #endif // !INCLUDE_JVMTI
2343 // --enable_preview
2344 } else if (match_option(option, "--enable-preview")) {
2345 set_enable_preview();
2346 // -Xnoclassgc
2347 } else if (match_option(option, "-Xnoclassgc")) {
2348 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2349 return JNI_EINVAL;
2350 }
2351 // -Xbatch
2352 } else if (match_option(option, "-Xbatch")) {
2353 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2354 return JNI_EINVAL;
2355 }
2356 // -Xmn for compatibility with other JVM vendors
2357 } else if (match_option(option, "-Xmn", &tail)) {
2358 julong long_initial_young_size = 0;
2359 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2360 if (errcode != arg_in_range) {
2361 jio_fprintf(defaultStream::error_stream(),
2362 "Invalid initial young generation size: %s\n", option->optionString);
2363 describe_range_error(errcode);
2364 return JNI_EINVAL;
2365 }
2366 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2367 return JNI_EINVAL;
2368 }
2369 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2370 return JNI_EINVAL;
2371 }
2372 // -Xms
2373 } else if (match_option(option, "-Xms", &tail)) {
2374 julong size = 0;
2375 // an initial heap size of 0 means automatically determine
2376 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2377 if (errcode != arg_in_range) {
2378 jio_fprintf(defaultStream::error_stream(),
2379 "Invalid initial heap size: %s\n", option->optionString);
2380 describe_range_error(errcode);
2381 return JNI_EINVAL;
2382 }
2383 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2384 return JNI_EINVAL;
2385 }
2386 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2387 return JNI_EINVAL;
2388 }
2389 // -Xmx
2390 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2391 julong long_max_heap_size = 0;
2392 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2393 if (errcode != arg_in_range) {
2394 jio_fprintf(defaultStream::error_stream(),
2395 "Invalid maximum heap size: %s\n", option->optionString);
2396 describe_range_error(errcode);
2397 return JNI_EINVAL;
2398 }
2399 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2400 return JNI_EINVAL;
2401 }
2402 // Xmaxf
2403 } else if (match_option(option, "-Xmaxf", &tail)) {
2404 char* err;
2405 double dmaxf = strtod(tail, &err);
2406 if (*err != '\0' || *tail == '\0') {
2407 jio_fprintf(defaultStream::error_stream(),
2408 "Bad max heap free ratio: %s\n",
2409 option->optionString);
2410 return JNI_EINVAL;
2411 }
2412 if (dmaxf < 0.0 || dmaxf > 1.0) {
2413 jio_fprintf(defaultStream::error_stream(),
2414 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2415 option->optionString);
2416 return JNI_EINVAL;
2417 }
2418 const uintx umaxf = (uintx)(dmaxf * 100);
2419 if (MinHeapFreeRatio > umaxf) {
2420 jio_fprintf(defaultStream::error_stream(),
2421 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2422 tail, MinHeapFreeRatio / 100.0f);
2423 return JNI_EINVAL;
2424 }
2425 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2426 return JNI_EINVAL;
2427 }
2428 // Xminf
2429 } else if (match_option(option, "-Xminf", &tail)) {
2430 char* err;
2431 double dminf = strtod(tail, &err);
2432 if (*err != '\0' || *tail == '\0') {
2433 jio_fprintf(defaultStream::error_stream(),
2434 "Bad min heap free ratio: %s\n",
2435 option->optionString);
2436 return JNI_EINVAL;
2437 }
2438 if (dminf < 0.0 || dminf > 1.0) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2441 tail);
2442 return JNI_EINVAL;
2443 }
2444 const uintx uminf = (uintx)(dminf * 100);
2445 if (MaxHeapFreeRatio < uminf) {
2446 jio_fprintf(defaultStream::error_stream(),
2447 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2448 tail, MaxHeapFreeRatio / 100.0f);
2449 return JNI_EINVAL;
2450 }
2451 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2452 return JNI_EINVAL;
2453 }
2454 // -Xss
2455 } else if (match_option(option, "-Xss", &tail)) {
2456 intx value = 0;
2457 jint err = parse_xss(option, tail, &value);
2458 if (err != JNI_OK) {
2459 return err;
2460 }
2461 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2462 return JNI_EINVAL;
2463 }
2464 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2465 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2466 julong long_ReservedCodeCacheSize = 0;
2467
2468 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2469 if (errcode != arg_in_range) {
2470 jio_fprintf(defaultStream::error_stream(),
2471 "Invalid maximum code cache size: %s.\n", option->optionString);
2472 return JNI_EINVAL;
2473 }
2474 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2475 return JNI_EINVAL;
2476 }
2477 // -green
2478 } else if (match_option(option, "-green")) {
2479 jio_fprintf(defaultStream::error_stream(),
2480 "Green threads support not available\n");
2481 return JNI_EINVAL;
2482 // -native
2483 } else if (match_option(option, "-native")) {
2484 // HotSpot always uses native threads, ignore silently for compatibility
2485 // -Xrs
2486 } else if (match_option(option, "-Xrs")) {
2487 // Classic/EVM option, new functionality
2488 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2489 return JNI_EINVAL;
2490 }
2491 // -Xprof
2492 } else if (match_option(option, "-Xprof")) {
2493 char version[256];
2494 // Obsolete in JDK 10
2495 JDK_Version::jdk(10).to_string(version, sizeof(version));
2496 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2497 // -Xinternalversion
2498 } else if (match_option(option, "-Xinternalversion")) {
2499 jio_fprintf(defaultStream::output_stream(), "%s\n",
2500 VM_Version::internal_vm_info_string());
2501 vm_exit(0);
2502 #ifndef PRODUCT
2503 // -Xprintflags
2504 } else if (match_option(option, "-Xprintflags")) {
2505 JVMFlag::printFlags(tty, false);
2506 vm_exit(0);
2507 #endif
2508 // -D
2509 } else if (match_option(option, "-D", &tail)) {
2510 const char* value;
2511 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2512 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2513 // abort if -Djava.endorsed.dirs is set
2514 jio_fprintf(defaultStream::output_stream(),
2515 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2516 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2517 return JNI_EINVAL;
2518 }
2519 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2520 *value != '\0' && strcmp(value, "\"\"") != 0) {
2521 // abort if -Djava.ext.dirs is set
2522 jio_fprintf(defaultStream::output_stream(),
2523 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2524 return JNI_EINVAL;
2525 }
2526 // Check for module related properties. They must be set using the modules
2527 // options. For example: use "--add-modules=java.sql", not
2528 // "-Djdk.module.addmods=java.sql"
2529 if (is_internal_module_property(option->optionString + 2)) {
2530 needs_module_property_warning = true;
2531 continue;
2532 }
2533 if (!add_property(tail)) {
2534 return JNI_ENOMEM;
2535 }
2536 // Out of the box management support
2537 if (match_option(option, "-Dcom.sun.management", &tail)) {
2538 #if INCLUDE_MANAGEMENT
2539 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2540 return JNI_EINVAL;
2541 }
2542 // management agent in module jdk.management.agent
2543 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2544 return JNI_ENOMEM;
2545 }
2546 #else
2547 jio_fprintf(defaultStream::output_stream(),
2548 "-Dcom.sun.management is not supported in this VM.\n");
2549 return JNI_ERR;
2550 #endif
2551 }
2552 // -Xint
2553 } else if (match_option(option, "-Xint")) {
2554 set_mode_flags(_int);
2555 mode_flag_cmd_line = true;
2556 // -Xmixed
2557 } else if (match_option(option, "-Xmixed")) {
2558 set_mode_flags(_mixed);
2559 mode_flag_cmd_line = true;
2560 // -Xcomp
2561 } else if (match_option(option, "-Xcomp")) {
2562 // for testing the compiler; turn off all flags that inhibit compilation
2563 set_mode_flags(_comp);
2564 mode_flag_cmd_line = true;
2565 // -Xshare:dump
2566 } else if (match_option(option, "-Xshare:dump")) {
2567 CDSConfig::enable_dumping_static_archive();
2568 CDSConfig::set_old_cds_flags_used();
2569 // -Xshare:on
2570 } else if (match_option(option, "-Xshare:on")) {
2571 UseSharedSpaces = true;
2572 RequireSharedSpaces = true;
2573 CDSConfig::set_old_cds_flags_used();
2574 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2575 } else if (match_option(option, "-Xshare:auto")) {
2576 UseSharedSpaces = true;
2577 RequireSharedSpaces = false;
2578 xshare_auto_cmd_line = true;
2579 CDSConfig::set_old_cds_flags_used();
2580 // -Xshare:off
2581 } else if (match_option(option, "-Xshare:off")) {
2582 UseSharedSpaces = false;
2583 RequireSharedSpaces = false;
2584 CDSConfig::set_old_cds_flags_used();
2585 // -Xverify
2586 } else if (match_option(option, "-Xverify", &tail)) {
2587 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2588 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2589 return JNI_EINVAL;
2590 }
2591 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2592 return JNI_EINVAL;
2593 }
2594 } else if (strcmp(tail, ":remote") == 0) {
2595 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2596 return JNI_EINVAL;
2597 }
2598 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2599 return JNI_EINVAL;
2600 }
2601 } else if (strcmp(tail, ":none") == 0) {
2602 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2603 return JNI_EINVAL;
2604 }
2605 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2606 return JNI_EINVAL;
2607 }
2608 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2609 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2610 return JNI_EINVAL;
2611 }
2612 // -Xdebug
2613 } else if (match_option(option, "-Xdebug")) {
2614 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2615 } else if (match_option(option, "-Xloggc:", &tail)) {
2616 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2617 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2618 _legacyGCLogging.lastFlag = 2;
2619 _legacyGCLogging.file = os::strdup_check_oom(tail);
2620 } else if (match_option(option, "-Xlog", &tail)) {
2621 bool ret = false;
2622 if (strcmp(tail, ":help") == 0) {
2623 fileStream stream(defaultStream::output_stream());
2624 LogConfiguration::print_command_line_help(&stream);
2625 vm_exit(0);
2626 } else if (strcmp(tail, ":disable") == 0) {
2627 LogConfiguration::disable_logging();
2628 ret = true;
2629 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2630 const char* async_tail = tail + strlen(":async");
2631 ret = LogConfiguration::parse_async_argument(async_tail);
2632 } else if (*tail == '\0') {
2633 ret = LogConfiguration::parse_command_line_arguments();
2634 assert(ret, "-Xlog without arguments should never fail to parse");
2635 } else if (*tail == ':') {
2636 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2637 }
2638 if (ret == false) {
2639 jio_fprintf(defaultStream::error_stream(),
2640 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2641 tail);
2642 return JNI_EINVAL;
2643 }
2644 // JNI hooks
2645 } else if (match_option(option, "-Xcheck", &tail)) {
2646 if (!strcmp(tail, ":jni")) {
2647 #if !INCLUDE_JNI_CHECK
2648 warning("JNI CHECKING is not supported in this VM");
2649 #else
2650 CheckJNICalls = true;
2651 #endif // INCLUDE_JNI_CHECK
2652 } else if (is_bad_option(option, args->ignoreUnrecognized,
2653 "check")) {
2654 return JNI_EINVAL;
2655 }
2656 } else if (match_option(option, "vfprintf")) {
2657 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2658 } else if (match_option(option, "exit")) {
2659 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2660 } else if (match_option(option, "abort")) {
2661 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2662 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2663 // and the last option wins.
2664 } else if (match_option(option, "-XX:+NeverTenure")) {
2665 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2666 return JNI_EINVAL;
2667 }
2668 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2672 return JNI_EINVAL;
2673 }
2674 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2675 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2679 return JNI_EINVAL;
2680 }
2681 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2682 return JNI_EINVAL;
2683 }
2684 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2685 uint max_tenuring_thresh = 0;
2686 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2687 jio_fprintf(defaultStream::error_stream(),
2688 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2689 return JNI_EINVAL;
2690 }
2691
2692 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695
2696 if (MaxTenuringThreshold == 0) {
2697 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2701 return JNI_EINVAL;
2702 }
2703 } else {
2704 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2708 return JNI_EINVAL;
2709 }
2710 }
2711 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2712 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2719 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2726 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2730 return JNI_EINVAL;
2731 }
2732 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2733 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2734 return JNI_EINVAL;
2735 }
2736 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 } else if (match_option(option, "--finalization=", &tail)) {
2740 if (strcmp(tail, "enabled") == 0) {
2741 InstanceKlass::set_finalization_enabled(true);
2742 } else if (strcmp(tail, "disabled") == 0) {
2743 InstanceKlass::set_finalization_enabled(false);
2744 } else {
2745 jio_fprintf(defaultStream::error_stream(),
2746 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2747 tail);
2748 return JNI_EINVAL;
2749 }
2750 #if !defined(DTRACE_ENABLED)
2751 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2752 jio_fprintf(defaultStream::error_stream(),
2753 "DTraceMethodProbes flag is not applicable for this configuration\n");
2754 return JNI_EINVAL;
2755 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2756 jio_fprintf(defaultStream::error_stream(),
2757 "DTraceAllocProbes flag is not applicable for this configuration\n");
2758 return JNI_EINVAL;
2759 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2760 jio_fprintf(defaultStream::error_stream(),
2761 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2762 return JNI_EINVAL;
2763 #endif // !defined(DTRACE_ENABLED)
2764 #ifdef ASSERT
2765 } else if (match_option(option, "-XX:+FullGCALot")) {
2766 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 #endif
2770 #if !INCLUDE_MANAGEMENT
2771 } else if (match_option(option, "-XX:+ManagementServer")) {
2772 jio_fprintf(defaultStream::error_stream(),
2773 "ManagementServer is not supported in this VM.\n");
2774 return JNI_ERR;
2775 #endif // INCLUDE_MANAGEMENT
2776 #if INCLUDE_JVMCI
2777 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2778 if (EnableJVMCIProduct) {
2779 jio_fprintf(defaultStream::error_stream(),
2780 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2781 return JNI_EINVAL;
2782 }
2783 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2784 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2785 if (use_graal_jit) {
2786 const char* jvmci_compiler = get_property("jvmci.Compiler");
2787 if (jvmci_compiler != nullptr) {
2788 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2789 jio_fprintf(defaultStream::error_stream(),
2790 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2791 return JNI_ERR;
2792 }
2793 } else if (!add_property("jvmci.Compiler=graal")) {
2794 return JNI_ENOMEM;
2795 }
2796 }
2797
2798 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2799 if (EnableJVMCIProduct) {
2800 continue;
2801 }
2802 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2803 // Allow this flag if it has been unlocked.
2804 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2805 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2806 jio_fprintf(defaultStream::error_stream(),
2807 "Unable to enable JVMCI in product mode\n");
2808 return JNI_ERR;
2809 }
2810 }
2811 // The flag was locked so process normally to report that error
2812 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2813 return JNI_EINVAL;
2814 }
2815 #endif // INCLUDE_JVMCI
2816 #if INCLUDE_JFR
2817 } else if (match_jfr_option(&option)) {
2818 return JNI_EINVAL;
2819 #endif
2820 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2821 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2822 // already been handled
2823 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2824 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2825 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2826 return JNI_EINVAL;
2827 }
2828 }
2829 // Unknown option
2830 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2831 return JNI_ERR;
2832 }
2833 }
2834
2835 // PrintSharedArchiveAndExit will turn on
2836 // -Xshare:on
2837 // -Xlog:class+path=info
2838 if (PrintSharedArchiveAndExit) {
2839 UseSharedSpaces = true;
2840 RequireSharedSpaces = true;
2841 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2842 }
2843
2844 fix_appclasspath();
2845
2846 return JNI_OK;
2847 }
2848
2849 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2850 // For java.base check for duplicate --patch-module options being specified on the command line.
2851 // This check is only required for java.base, all other duplicate module specifications
2852 // will be checked during module system initialization. The module system initialization
2853 // will throw an ExceptionInInitializerError if this situation occurs.
2854 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2855 if (patch_mod_javabase) {
2856 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2857 } else {
2858 patch_mod_javabase = true;
2859 }
2860 }
2861
2862 // Create GrowableArray lazily, only if --patch-module has been specified
2863 if (_patch_mod_prefix == nullptr) {
2864 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2865 }
2866
2867 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2868 }
2869
2870 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2871 //
2872 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2873 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2874 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2875 // path is treated as the current directory.
2876 //
2877 // This causes problems with CDS, which requires that all directories specified in the classpath
2878 // must be empty. In most cases, applications do NOT want to load classes from the current
2879 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2880 // scripts compatible with CDS.
2881 void Arguments::fix_appclasspath() {
2882 if (IgnoreEmptyClassPaths) {
2883 const char separator = *os::path_separator();
2884 const char* src = _java_class_path->value();
2885
2886 // skip over all the leading empty paths
2887 while (*src == separator) {
2888 src ++;
2889 }
2890
2891 char* copy = os::strdup_check_oom(src, mtArguments);
2892
2893 // trim all trailing empty paths
2894 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2895 *tail = '\0';
2896 }
2897
2898 char from[3] = {separator, separator, '\0'};
2899 char to [2] = {separator, '\0'};
2900 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2901 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2902 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2903 }
2904
2905 _java_class_path->set_writeable_value(copy);
2906 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2907 }
2908 }
2909
2910 jint Arguments::finalize_vm_init_args() {
2911 // check if the default lib/endorsed directory exists; if so, error
2912 char path[JVM_MAXPATHLEN];
2913 const char* fileSep = os::file_separator();
2914 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2915
2916 DIR* dir = os::opendir(path);
2917 if (dir != nullptr) {
2918 jio_fprintf(defaultStream::output_stream(),
2919 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2920 "in modular form will be supported via the concept of upgradeable modules.\n");
2921 os::closedir(dir);
2922 return JNI_ERR;
2923 }
2924
2925 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2926 dir = os::opendir(path);
2927 if (dir != nullptr) {
2928 jio_fprintf(defaultStream::output_stream(),
2929 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2930 "Use -classpath instead.\n.");
2931 os::closedir(dir);
2932 return JNI_ERR;
2933 }
2934
2935 // This must be done after all arguments have been processed
2936 // and the container support has been initialized since AggressiveHeap
2937 // relies on the amount of total memory available.
2938 if (AggressiveHeap) {
2939 jint result = set_aggressive_heap_flags();
2940 if (result != JNI_OK) {
2941 return result;
2942 }
2943 }
2944
2945 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2946 // but like -Xint, leave compilation thresholds unaffected.
2947 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2948 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2949 set_mode_flags(_int);
2950 }
2951
2952 #ifdef ZERO
2953 // Zero always runs in interpreted mode
2954 set_mode_flags(_int);
2955 #endif
2956
2957 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2958 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2959 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2960 }
2961
2962 #if !COMPILER2_OR_JVMCI
2963 // Don't degrade server performance for footprint
2964 if (FLAG_IS_DEFAULT(UseLargePages) &&
2965 MaxHeapSize < LargePageHeapSizeThreshold) {
2966 // No need for large granularity pages w/small heaps.
2967 // Note that large pages are enabled/disabled for both the
2968 // Java heap and the code cache.
2969 FLAG_SET_DEFAULT(UseLargePages, false);
2970 }
2971
2972 UNSUPPORTED_OPTION(ProfileInterpreter);
2973 #endif
2974
2975 // Parse the CompilationMode flag
2976 if (!CompilationModeFlag::initialize()) {
2977 return JNI_ERR;
2978 }
2979
2980 if (!check_vm_args_consistency()) {
2981 return JNI_ERR;
2982 }
2983
2984
2985 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2986 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2987 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2988
2989 return JNI_OK;
2990 }
2991
2992 // Helper class for controlling the lifetime of JavaVMInitArgs
2993 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2994 // deleted on the destruction of the ScopedVMInitArgs object.
2995 class ScopedVMInitArgs : public StackObj {
2996 private:
2997 JavaVMInitArgs _args;
2998 char* _container_name;
2999 bool _is_set;
3000 char* _vm_options_file_arg;
3001
3002 public:
3003 ScopedVMInitArgs(const char *container_name) {
3004 _args.version = JNI_VERSION_1_2;
3005 _args.nOptions = 0;
3006 _args.options = nullptr;
3007 _args.ignoreUnrecognized = false;
3008 _container_name = (char *)container_name;
3009 _is_set = false;
3010 _vm_options_file_arg = nullptr;
3011 }
3012
3013 // Populates the JavaVMInitArgs object represented by this
3014 // ScopedVMInitArgs object with the arguments in options. The
3015 // allocated memory is deleted by the destructor. If this method
3016 // returns anything other than JNI_OK, then this object is in a
3017 // partially constructed state, and should be abandoned.
3018 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3019 _is_set = true;
3020 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3021 JavaVMOption, options->length(), mtArguments);
3022 if (options_arr == nullptr) {
3023 return JNI_ENOMEM;
3024 }
3025 _args.options = options_arr;
3026
3027 for (int i = 0; i < options->length(); i++) {
3028 options_arr[i] = options->at(i);
3029 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3030 if (options_arr[i].optionString == nullptr) {
3031 // Rely on the destructor to do cleanup.
3032 _args.nOptions = i;
3033 return JNI_ENOMEM;
3034 }
3035 }
3036
3037 _args.nOptions = options->length();
3038 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3039 return JNI_OK;
3040 }
3041
3042 JavaVMInitArgs* get() { return &_args; }
3043 char* container_name() { return _container_name; }
3044 bool is_set() { return _is_set; }
3045 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3046 char* vm_options_file_arg() { return _vm_options_file_arg; }
3047
3048 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3049 if (_vm_options_file_arg != nullptr) {
3050 os::free(_vm_options_file_arg);
3051 }
3052 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3053 }
3054
3055 ~ScopedVMInitArgs() {
3056 if (_vm_options_file_arg != nullptr) {
3057 os::free(_vm_options_file_arg);
3058 }
3059 if (_args.options == nullptr) return;
3060 for (int i = 0; i < _args.nOptions; i++) {
3061 os::free(_args.options[i].optionString);
3062 }
3063 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3064 }
3065
3066 // Insert options into this option list, to replace option at
3067 // vm_options_file_pos (-XX:VMOptionsFile)
3068 jint insert(const JavaVMInitArgs* args,
3069 const JavaVMInitArgs* args_to_insert,
3070 const int vm_options_file_pos) {
3071 assert(_args.options == nullptr, "shouldn't be set yet");
3072 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3073 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3074
3075 int length = args->nOptions + args_to_insert->nOptions - 1;
3076 // Construct new option array
3077 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3078 for (int i = 0; i < args->nOptions; i++) {
3079 if (i == vm_options_file_pos) {
3080 // insert the new options starting at the same place as the
3081 // -XX:VMOptionsFile option
3082 for (int j = 0; j < args_to_insert->nOptions; j++) {
3083 options.push(args_to_insert->options[j]);
3084 }
3085 } else {
3086 options.push(args->options[i]);
3087 }
3088 }
3089 // make into options array
3090 return set_args(&options);
3091 }
3092 };
3093
3094 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3095 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3096 }
3097
3098 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3099 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3100 }
3101
3102 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3103 for (int index = args->nOptions - 1; index >= 0; index--) {
3104 JavaVMOption* option = args->options + index;
3105 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3106 return option;
3107 }
3108 }
3109
3110 return nullptr;
3111 }
3112
3113 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3114 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3115 // Don't bother scanning all the args if this env variable is not set
3116 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3117 return JNI_OK;
3118 }
3119
3120 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3121 // of AOTMode.
3122 JavaVMOption* option = nullptr;
3123 for (int i = all_args->length() - 1; i >= 0; i--) {
3124 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3125 break;
3126 }
3127 }
3128
3129 if (option != nullptr) {
3130 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3131 // so its value is not reflected inside the global variable AOTMode.
3132 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3133 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3134 }
3135 } else {
3136 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3137 // which would have been set inside process_settings_file();
3138 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3139 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3140 }
3141 }
3142
3143 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3144 }
3145
3146 jint Arguments::parse_options_environment_variable(const char* name,
3147 ScopedVMInitArgs* vm_args) {
3148 char *buffer = ::getenv(name);
3149
3150 // Don't check this environment variable if user has special privileges
3151 // (e.g. unix su command).
3152 if (buffer == nullptr || os::have_special_privileges()) {
3153 return JNI_OK;
3154 }
3155
3156 if ((buffer = os::strdup(buffer)) == nullptr) {
3157 return JNI_ENOMEM;
3158 }
3159
3160 jio_fprintf(defaultStream::error_stream(),
3161 "Picked up %s: %s\n", name, buffer);
3162
3163 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3164
3165 os::free(buffer);
3166 return retcode;
3167 }
3168
3169 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3170 // read file into buffer
3171 int fd = ::open(file_name, O_RDONLY);
3172 if (fd < 0) {
3173 jio_fprintf(defaultStream::error_stream(),
3174 "Could not open options file '%s'\n",
3175 file_name);
3176 return JNI_ERR;
3177 }
3178
3179 struct stat stbuf;
3180 int retcode = os::stat(file_name, &stbuf);
3181 if (retcode != 0) {
3182 jio_fprintf(defaultStream::error_stream(),
3183 "Could not stat options file '%s'\n",
3184 file_name);
3185 ::close(fd);
3186 return JNI_ERR;
3187 }
3188
3189 if (stbuf.st_size == 0) {
3190 // tell caller there is no option data and that is ok
3191 ::close(fd);
3192 return JNI_OK;
3193 }
3194
3195 // '+ 1' for null termination even with max bytes
3196 size_t bytes_alloc = stbuf.st_size + 1;
3197
3198 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3199 if (nullptr == buf) {
3200 jio_fprintf(defaultStream::error_stream(),
3201 "Could not allocate read buffer for options file parse\n");
3202 ::close(fd);
3203 return JNI_ENOMEM;
3204 }
3205
3206 memset(buf, 0, bytes_alloc);
3207
3208 // Fill buffer
3209 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3210 ::close(fd);
3211 if (bytes_read < 0) {
3212 FREE_C_HEAP_ARRAY(char, buf);
3213 jio_fprintf(defaultStream::error_stream(),
3214 "Could not read options file '%s'\n", file_name);
3215 return JNI_ERR;
3216 }
3217
3218 if (bytes_read == 0) {
3219 // tell caller there is no option data and that is ok
3220 FREE_C_HEAP_ARRAY(char, buf);
3221 return JNI_OK;
3222 }
3223
3224 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3225
3226 FREE_C_HEAP_ARRAY(char, buf);
3227 return retcode;
3228 }
3229
3230 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3231 // Construct option array
3232 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3233
3234 // some pointers to help with parsing
3235 char *buffer_end = buffer + buf_len;
3236 char *opt_hd = buffer;
3237 char *wrt = buffer;
3238 char *rd = buffer;
3239
3240 // parse all options
3241 while (rd < buffer_end) {
3242 // skip leading white space from the input string
3243 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3244 rd++;
3245 }
3246
3247 if (rd >= buffer_end) {
3248 break;
3249 }
3250
3251 // Remember this is where we found the head of the token.
3252 opt_hd = wrt;
3253
3254 // Tokens are strings of non white space characters separated
3255 // by one or more white spaces.
3256 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3257 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3258 int quote = *rd; // matching quote to look for
3259 rd++; // don't copy open quote
3260 while (rd < buffer_end && *rd != quote) {
3261 // include everything (even spaces)
3262 // up until the close quote
3263 *wrt++ = *rd++; // copy to option string
3264 }
3265
3266 if (rd < buffer_end) {
3267 rd++; // don't copy close quote
3268 } else {
3269 // did not see closing quote
3270 jio_fprintf(defaultStream::error_stream(),
3271 "Unmatched quote in %s\n", name);
3272 return JNI_ERR;
3273 }
3274 } else {
3275 *wrt++ = *rd++; // copy to option string
3276 }
3277 }
3278
3279 // steal a white space character and set it to null
3280 *wrt++ = '\0';
3281 // We now have a complete token
3282
3283 JavaVMOption option;
3284 option.optionString = opt_hd;
3285 option.extraInfo = nullptr;
3286
3287 options.append(option); // Fill in option
3288
3289 rd++; // Advance to next character
3290 }
3291
3292 // Fill out JavaVMInitArgs structure.
3293 return vm_args->set_args(&options);
3294 }
3295
3296 #ifndef PRODUCT
3297 // Determine whether LogVMOutput should be implicitly turned on.
3298 static bool use_vm_log() {
3299 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3300 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3301 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3302 PrintAssembly || TraceDeoptimization ||
3303 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3304 return true;
3305 }
3306
3307 #ifdef COMPILER1
3308 if (PrintC1Statistics) {
3309 return true;
3310 }
3311 #endif // COMPILER1
3312
3313 #ifdef COMPILER2
3314 if (PrintOptoAssembly || PrintOptoStatistics) {
3315 return true;
3316 }
3317 #endif // COMPILER2
3318
3319 return false;
3320 }
3321
3322 #endif // PRODUCT
3323
3324 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3325 for (int index = 0; index < args->nOptions; index++) {
3326 const JavaVMOption* option = args->options + index;
3327 const char* tail;
3328 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3329 return true;
3330 }
3331 }
3332 return false;
3333 }
3334
3335 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3336 const char* vm_options_file,
3337 const int vm_options_file_pos,
3338 ScopedVMInitArgs* vm_options_file_args,
3339 ScopedVMInitArgs* args_out) {
3340 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3341 if (code != JNI_OK) {
3342 return code;
3343 }
3344
3345 if (vm_options_file_args->get()->nOptions < 1) {
3346 return JNI_OK;
3347 }
3348
3349 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3350 jio_fprintf(defaultStream::error_stream(),
3351 "A VM options file may not refer to a VM options file. "
3352 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3353 "options file '%s' in options container '%s' is an error.\n",
3354 vm_options_file_args->vm_options_file_arg(),
3355 vm_options_file_args->container_name());
3356 return JNI_EINVAL;
3357 }
3358
3359 return args_out->insert(args, vm_options_file_args->get(),
3360 vm_options_file_pos);
3361 }
3362
3363 // Expand -XX:VMOptionsFile found in args_in as needed.
3364 // mod_args and args_out parameters may return values as needed.
3365 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3366 ScopedVMInitArgs* mod_args,
3367 JavaVMInitArgs** args_out) {
3368 jint code = match_special_option_and_act(args_in, mod_args);
3369 if (code != JNI_OK) {
3370 return code;
3371 }
3372
3373 if (mod_args->is_set()) {
3374 // args_in contains -XX:VMOptionsFile and mod_args contains the
3375 // original options from args_in along with the options expanded
3376 // from the VMOptionsFile. Return a short-hand to the caller.
3377 *args_out = mod_args->get();
3378 } else {
3379 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3380 }
3381 return JNI_OK;
3382 }
3383
3384 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3385 ScopedVMInitArgs* args_out) {
3386 // Remaining part of option string
3387 const char* tail;
3388 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3389
3390 for (int index = 0; index < args->nOptions; index++) {
3391 const JavaVMOption* option = args->options + index;
3392 if (match_option(option, "-XX:Flags=", &tail)) {
3393 Arguments::set_jvm_flags_file(tail);
3394 continue;
3395 }
3396 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3397 if (vm_options_file_args.found_vm_options_file_arg()) {
3398 jio_fprintf(defaultStream::error_stream(),
3399 "The option '%s' is already specified in the options "
3400 "container '%s' so the specification of '%s' in the "
3401 "same options container is an error.\n",
3402 vm_options_file_args.vm_options_file_arg(),
3403 vm_options_file_args.container_name(),
3404 option->optionString);
3405 return JNI_EINVAL;
3406 }
3407 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3408 // If there's a VMOptionsFile, parse that
3409 jint code = insert_vm_options_file(args, tail, index,
3410 &vm_options_file_args, args_out);
3411 if (code != JNI_OK) {
3412 return code;
3413 }
3414 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3415 if (args_out->is_set()) {
3416 // The VMOptions file inserted some options so switch 'args'
3417 // to the new set of options, and continue processing which
3418 // preserves "last option wins" semantics.
3419 args = args_out->get();
3420 // The first option from the VMOptionsFile replaces the
3421 // current option. So we back track to process the
3422 // replacement option.
3423 index--;
3424 }
3425 continue;
3426 }
3427 if (match_option(option, "-XX:+PrintVMOptions")) {
3428 PrintVMOptions = true;
3429 continue;
3430 }
3431 if (match_option(option, "-XX:-PrintVMOptions")) {
3432 PrintVMOptions = false;
3433 continue;
3434 }
3435 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3436 IgnoreUnrecognizedVMOptions = true;
3437 continue;
3438 }
3439 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3440 IgnoreUnrecognizedVMOptions = false;
3441 continue;
3442 }
3443 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3444 JVMFlag::printFlags(tty, false);
3445 vm_exit(0);
3446 }
3447
3448 #ifndef PRODUCT
3449 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3450 JVMFlag::printFlags(tty, true);
3451 vm_exit(0);
3452 }
3453 #endif
3454 }
3455 return JNI_OK;
3456 }
3457
3458 static void print_options(const JavaVMInitArgs *args) {
3459 const char* tail;
3460 for (int index = 0; index < args->nOptions; index++) {
3461 const JavaVMOption *option = args->options + index;
3462 if (match_option(option, "-XX:", &tail)) {
3463 logOption(tail);
3464 }
3465 }
3466 }
3467
3468 bool Arguments::handle_deprecated_print_gc_flags() {
3469 if (PrintGC) {
3470 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3471 }
3472 if (PrintGCDetails) {
3473 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3474 }
3475
3476 if (_legacyGCLogging.lastFlag == 2) {
3477 // -Xloggc was used to specify a filename
3478 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3479
3480 LogTarget(Error, logging) target;
3481 LogStream errstream(target);
3482 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3483 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3484 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3485 }
3486 return true;
3487 }
3488
3489 static void apply_debugger_ergo() {
3490 #ifdef ASSERT
3491 if (ReplayCompiles) {
3492 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3493 }
3494
3495 if (UseDebuggerErgo) {
3496 // Turn on sub-flags
3497 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3498 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3499 }
3500
3501 if (UseDebuggerErgo2) {
3502 // Debugging with limited number of CPUs
3503 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3504 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3505 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3506 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3507 }
3508 #endif // ASSERT
3509 }
3510
3511 // Parse entry point called from JNI_CreateJavaVM
3512
3513 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3514 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3515 JVMFlag::check_all_flag_declarations();
3516
3517 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3518 const char* hotspotrc = ".hotspotrc";
3519 bool settings_file_specified = false;
3520 bool needs_hotspotrc_warning = false;
3521 ScopedVMInitArgs initial_vm_options_args("");
3522 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3523 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3524 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3525
3526 // Pointers to current working set of containers
3527 JavaVMInitArgs* cur_cmd_args;
3528 JavaVMInitArgs* cur_vm_options_args;
3529 JavaVMInitArgs* cur_java_options_args;
3530 JavaVMInitArgs* cur_java_tool_options_args;
3531 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3532
3533 // Containers for modified/expanded options
3534 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3535 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3536 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3537 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3538 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3539
3540 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3541
3542 jint code =
3543 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3544 if (code != JNI_OK) {
3545 return code;
3546 }
3547
3548 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3549 // This is an undocumented feature.
3550 code = parse_java_options_environment_variable(&initial_java_options_args);
3551 if (code != JNI_OK) {
3552 return code;
3553 }
3554
3555 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3556 char *vmoptions = ClassLoader::lookup_vm_options();
3557 if (vmoptions != nullptr) {
3558 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3559 FREE_C_HEAP_ARRAY(char, vmoptions);
3560 if (code != JNI_OK) {
3561 return code;
3562 }
3563 }
3564
3565 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3566 &mod_java_tool_options_args,
3567 &cur_java_tool_options_args);
3568 if (code != JNI_OK) {
3569 return code;
3570 }
3571
3572 code = expand_vm_options_as_needed(initial_cmd_args,
3573 &mod_cmd_args,
3574 &cur_cmd_args);
3575 if (code != JNI_OK) {
3576 return code;
3577 }
3578
3579 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3580 &mod_java_options_args,
3581 &cur_java_options_args);
3582 if (code != JNI_OK) {
3583 return code;
3584 }
3585
3586 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3587 &mod_vm_options_args,
3588 &cur_vm_options_args);
3589 if (code != JNI_OK) {
3590 return code;
3591 }
3592
3593 const char* flags_file = Arguments::get_jvm_flags_file();
3594 settings_file_specified = (flags_file != nullptr);
3595
3596 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3597 if (settings_file_specified) {
3598 if (!process_settings_file(flags_file, true,
3599 IgnoreUnrecognizedVMOptions)) {
3600 return JNI_EINVAL;
3601 }
3602 } else {
3603 #ifdef ASSERT
3604 // Parse default .hotspotrc settings file
3605 if (!process_settings_file(".hotspotrc", false,
3606 IgnoreUnrecognizedVMOptions)) {
3607 return JNI_EINVAL;
3608 }
3609 #else
3610 struct stat buf;
3611 if (os::stat(hotspotrc, &buf) == 0) {
3612 needs_hotspotrc_warning = true;
3613 }
3614 #endif
3615 }
3616
3617 // The settings in the args are applied in this order to the the JVM global flags.
3618 // For historical reasons, the order is DIFFERENT than the scanning order of
3619 // the above expand_vm_options_as_needed() calls.
3620 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3621 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3622 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3623 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3624
3625 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3626 // the options that have been gathered above.
3627 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3628 if (code != JNI_OK) {
3629 return code;
3630 }
3631 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3632 &mod_jdk_aot_vm_options_args,
3633 &cur_jdk_aot_vm_options_args);
3634 if (code != JNI_OK) {
3635 return code;
3636 }
3637
3638 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3639 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3640 const char* optionString = option->optionString;
3641 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3642 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3643 jio_fprintf(defaultStream::error_stream(),
3644 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3645 return JNI_ERR;
3646 }
3647 }
3648
3649 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3650
3651 if (IgnoreUnrecognizedVMOptions) {
3652 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3653 // the JDK so it shouldn't have bad options.
3654 cur_cmd_args->ignoreUnrecognized = true;
3655 cur_java_tool_options_args->ignoreUnrecognized = true;
3656 cur_java_options_args->ignoreUnrecognized = true;
3657 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3658 }
3659
3660 if (PrintVMOptions) {
3661 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3662 print_options(cur_java_tool_options_args);
3663 print_options(cur_cmd_args);
3664 print_options(cur_java_options_args);
3665 print_options(cur_jdk_aot_vm_options_args);
3666 }
3667
3668 // Apply the settings in these args to the JVM global flags.
3669 jint result = parse_vm_init_args(&all_args);
3670
3671 if (result != JNI_OK) {
3672 return result;
3673 }
3674
3675 // Delay warning until here so that we've had a chance to process
3676 // the -XX:-PrintWarnings flag
3677 if (needs_hotspotrc_warning) {
3678 warning("%s file is present but has been ignored. "
3679 "Run with -XX:Flags=%s to load the file.",
3680 hotspotrc, hotspotrc);
3681 }
3682
3683 if (needs_module_property_warning) {
3684 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3685 " names that are reserved for internal use.");
3686 }
3687
3688 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3689 UNSUPPORTED_OPTION(UseLargePages);
3690 #endif
3691
3692 #if defined(AIX)
3693 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3694 #endif
3695
3696 #ifndef PRODUCT
3697 if (TraceBytecodesAt != 0) {
3698 TraceBytecodes = true;
3699 }
3700 #endif // PRODUCT
3701
3702 if (ScavengeRootsInCode == 0) {
3703 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3704 warning("Forcing ScavengeRootsInCode non-zero");
3705 }
3706 ScavengeRootsInCode = 1;
3707 }
3708
3709 if (!handle_deprecated_print_gc_flags()) {
3710 return JNI_EINVAL;
3711 }
3712
3713 // Set object alignment values.
3714 set_object_alignment();
3715
3716 #if !INCLUDE_CDS
3717 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3718 jio_fprintf(defaultStream::error_stream(),
3719 "Shared spaces are not supported in this VM\n");
3720 return JNI_ERR;
3721 }
3722 if (DumpLoadedClassList != nullptr) {
3723 jio_fprintf(defaultStream::error_stream(),
3724 "DumpLoadedClassList is not supported in this VM\n");
3725 return JNI_ERR;
3726 }
3727 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3728 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3729 warning("Shared spaces are not supported in this VM");
3730 UseSharedSpaces = false;
3731 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3732 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3733 }
3734 no_shared_spaces("CDS Disabled");
3735 #endif // INCLUDE_CDS
3736
3737 // Verify NMT arguments
3738 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3739 if (lvl == NMT_unknown) {
3740 jio_fprintf(defaultStream::error_stream(),
3741 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3742 return JNI_ERR;
3743 }
3744 if (PrintNMTStatistics && lvl == NMT_off) {
3745 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3746 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3747 }
3748
3749 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3750 if (trace_dependencies && VerifyDependencies) {
3751 warning("dependency logging results may be inflated by VerifyDependencies");
3752 }
3753
3754 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3755 log_is_enabled(Info, class, load, cause);
3756 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3757 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3758 }
3759
3760 apply_debugger_ergo();
3761
3762 // The VMThread needs to stop now and then to execute these debug options.
3763 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3764 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3765 }
3766
3767 if (log_is_enabled(Info, arguments)) {
3768 LogStream st(Log(arguments)::info());
3769 Arguments::print_on(&st);
3770 }
3771
3772 return JNI_OK;
3773 }
3774
3775 void Arguments::set_compact_headers_flags() {
3776 #ifdef _LP64
3777 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3778 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3779 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3780 }
3781 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3782 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3783 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3784 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3785
3786 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3787 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3788 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3789 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3790 } else {
3791 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3792 }
3793 }
3794 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3795 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3796 }
3797 #endif
3798 }
3799
3800 jint Arguments::apply_ergo() {
3801 // Set flags based on ergonomics.
3802 jint result = set_ergonomics_flags();
3803 if (result != JNI_OK) return result;
3804
3805 // Set heap size based on available physical memory
3806 set_heap_size();
3807
3808 GCConfig::arguments()->initialize();
3809
3810 set_compact_headers_flags();
3811
3812 if (UseCompressedClassPointers) {
3813 CompressedKlassPointers::pre_initialize();
3814 }
3815
3816 CDSConfig::ergo_initialize();
3817
3818 // Initialize Metaspace flags and alignments
3819 Metaspace::ergo_initialize();
3820
3821 if (!StringDedup::ergo_initialize()) {
3822 return JNI_EINVAL;
3823 }
3824
3825 // Set compiler flags after GC is selected and GC specific
3826 // flags (LoopStripMiningIter) are set.
3827 CompilerConfig::ergo_initialize();
3828
3829 // Set bytecode rewriting flags
3830 set_bytecode_flags();
3831
3832 // Set flags if aggressive optimization flags are enabled
3833 jint code = set_aggressive_opts_flags();
3834 if (code != JNI_OK) {
3835 return code;
3836 }
3837
3838 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3839 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3840 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3841 warning("UseSecondarySupersTable is not supported");
3842 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3843 }
3844 if (!UseSecondarySupersTable) {
3845 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3846 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3847 }
3848
3849 #ifdef ZERO
3850 // Clear flags not supported on zero.
3851 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3852 #endif // ZERO
3853
3854 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3855 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3856 DebugNonSafepoints = true;
3857 }
3858
3859 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3860 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3861 }
3862
3863 // Treat the odd case where local verification is enabled but remote
3864 // verification is not as if both were enabled.
3865 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3866 log_info(verification)("Turning on remote verification because local verification is on");
3867 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3868 }
3869
3870 #ifndef PRODUCT
3871 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3872 if (use_vm_log()) {
3873 LogVMOutput = true;
3874 }
3875 }
3876 #endif // PRODUCT
3877
3878 if (PrintCommandLineFlags) {
3879 JVMFlag::printSetFlags(tty);
3880 }
3881
3882 #if COMPILER2_OR_JVMCI
3883 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3884 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3885 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3886 }
3887 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3888
3889 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3890 if (!EnableVectorReboxing) {
3891 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3892 } else {
3893 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3894 }
3895 }
3896 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3897 }
3898 #endif // COMPILER2_OR_JVMCI
3899
3900 #ifdef COMPILER2
3901 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3902 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3903 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3904 }
3905 #endif // COMPILER2
3906
3907 if (log_is_enabled(Info, perf, class, link)) {
3908 if (!UsePerfData) {
3909 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3910 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3911 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3912 }
3913 }
3914
3915 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3916 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3917 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3918 }
3919 }
3920 return JNI_OK;
3921 }
3922
3923 jint Arguments::adjust_after_os() {
3924 if (UseNUMA) {
3925 if (UseParallelGC) {
3926 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3927 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3928 }
3929 }
3930 }
3931 return JNI_OK;
3932 }
3933
3934 int Arguments::PropertyList_count(SystemProperty* pl) {
3935 int count = 0;
3936 while(pl != nullptr) {
3937 count++;
3938 pl = pl->next();
3939 }
3940 return count;
3941 }
3942
3943 // Return the number of readable properties.
3944 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3945 int count = 0;
3946 while(pl != nullptr) {
3947 if (pl->readable()) {
3948 count++;
3949 }
3950 pl = pl->next();
3951 }
3952 return count;
3953 }
3954
3955 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3956 assert(key != nullptr, "just checking");
3957 SystemProperty* prop;
3958 for (prop = pl; prop != nullptr; prop = prop->next()) {
3959 if (strcmp(key, prop->key()) == 0) return prop->value();
3960 }
3961 return nullptr;
3962 }
3963
3964 // Return the value of the requested property provided that it is a readable property.
3965 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3966 assert(key != nullptr, "just checking");
3967 SystemProperty* prop;
3968 // Return the property value if the keys match and the property is not internal or
3969 // it's the special internal property "jdk.boot.class.path.append".
3970 for (prop = pl; prop != nullptr; prop = prop->next()) {
3971 if (strcmp(key, prop->key()) == 0) {
3972 if (!prop->internal()) {
3973 return prop->value();
3974 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3975 return prop->value();
3976 } else {
3977 // Property is internal and not jdk.boot.class.path.append so return null.
3978 return nullptr;
3979 }
3980 }
3981 }
3982 return nullptr;
3983 }
3984
3985 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3986 SystemProperty* p = *plist;
3987 if (p == nullptr) {
3988 *plist = new_p;
3989 } else {
3990 while (p->next() != nullptr) {
3991 p = p->next();
3992 }
3993 p->set_next(new_p);
3994 }
3995 }
3996
3997 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3998 bool writeable, bool internal) {
3999 if (plist == nullptr)
4000 return;
4001
4002 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4003 PropertyList_add(plist, new_p);
4004 }
4005
4006 void Arguments::PropertyList_add(SystemProperty *element) {
4007 PropertyList_add(&_system_properties, element);
4008 }
4009
4010 // This add maintains unique property key in the list.
4011 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4012 PropertyAppendable append, PropertyWriteable writeable,
4013 PropertyInternal internal) {
4014 if (plist == nullptr)
4015 return;
4016
4017 // If property key exists and is writeable, then update with new value.
4018 // Trying to update a non-writeable property is silently ignored.
4019 SystemProperty* prop;
4020 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4021 if (strcmp(k, prop->key()) == 0) {
4022 if (append == AppendProperty) {
4023 prop->append_writeable_value(v);
4024 } else {
4025 prop->set_writeable_value(v);
4026 }
4027 return;
4028 }
4029 }
4030
4031 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4032 }
4033
4034 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4035 // Returns true if all of the source pointed by src has been copied over to
4036 // the destination buffer pointed by buf. Otherwise, returns false.
4037 // Notes:
4038 // 1. If the length (buflen) of the destination buffer excluding the
4039 // null terminator character is not long enough for holding the expanded
4040 // pid characters, it also returns false instead of returning the partially
4041 // expanded one.
4042 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4043 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4044 char* buf, size_t buflen) {
4045 const char* p = src;
4046 char* b = buf;
4047 const char* src_end = &src[srclen];
4048 char* buf_end = &buf[buflen - 1];
4049
4050 while (p < src_end && b < buf_end) {
4051 if (*p == '%') {
4052 switch (*(++p)) {
4053 case '%': // "%%" ==> "%"
4054 *b++ = *p++;
4055 break;
4056 case 'p': { // "%p" ==> current process id
4057 // buf_end points to the character before the last character so
4058 // that we could write '\0' to the end of the buffer.
4059 size_t buf_sz = buf_end - b + 1;
4060 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4061
4062 // if jio_snprintf fails or the buffer is not long enough to hold
4063 // the expanded pid, returns false.
4064 if (ret < 0 || ret >= (int)buf_sz) {
4065 return false;
4066 } else {
4067 b += ret;
4068 assert(*b == '\0', "fail in copy_expand_pid");
4069 if (p == src_end && b == buf_end + 1) {
4070 // reach the end of the buffer.
4071 return true;
4072 }
4073 }
4074 p++;
4075 break;
4076 }
4077 default :
4078 *b++ = '%';
4079 }
4080 } else {
4081 *b++ = *p++;
4082 }
4083 }
4084 *b = '\0';
4085 return (p == src_end); // return false if not all of the source was copied
4086 }