1 /*
2 * Copyright (c) 1997, 2026, 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/debug.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/macros.hpp"
70 #include "utilities/parseInteger.hpp"
71 #include "utilities/powerOfTwo.hpp"
72 #include "utilities/stringUtils.hpp"
73 #include "utilities/systemMemoryBarrier.hpp"
74 #if INCLUDE_JFR
75 #include "jfr/jfr.hpp"
76 #endif
77
78 static const char _default_java_launcher[] = "generic";
79
80 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
81
82 char* Arguments::_jvm_flags_file = nullptr;
83 char** Arguments::_jvm_flags_array = nullptr;
84 int Arguments::_num_jvm_flags = 0;
85 char** Arguments::_jvm_args_array = nullptr;
86 int Arguments::_num_jvm_args = 0;
87 unsigned int Arguments::_addmods_count = 0;
88 #if INCLUDE_JVMCI
89 bool Arguments::_jvmci_module_added = false;
90 #endif
91 char* Arguments::_java_command = nullptr;
92 SystemProperty* Arguments::_system_properties = nullptr;
93 size_t Arguments::_conservative_max_heap_alignment = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 const char* Arguments::_java_vendor_url_bug = nullptr;
96 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
97 bool Arguments::_executing_unit_tests = false;
98
99 // These parameters are reset in method parse_vm_init_args()
100 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
101 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
102 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
103 bool Arguments::_ClipInlining = ClipInlining;
104 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
105
106 bool Arguments::_enable_preview = false;
107 bool Arguments::_has_jdwp_agent = false;
108
109 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
110
111 // These are not set by the JDK's built-in launchers, but they can be set by
112 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
113 // JavaVMOption in jni.h.
114 abort_hook_t Arguments::_abort_hook = nullptr;
115 exit_hook_t Arguments::_exit_hook = nullptr;
116 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
117
118
119 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
120 SystemProperty *Arguments::_java_library_path = nullptr;
121 SystemProperty *Arguments::_java_home = nullptr;
122 SystemProperty *Arguments::_java_class_path = nullptr;
123 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
124 SystemProperty *Arguments::_vm_info = nullptr;
125
126 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
127 PathString *Arguments::_boot_class_path = nullptr;
128 bool Arguments::_has_jimage = false;
129
130 char* Arguments::_ext_dirs = nullptr;
131
132 // True if -Xshare:auto option was specified.
133 static bool xshare_auto_cmd_line = false;
134
135 // True if -Xint/-Xmixed/-Xcomp were specified
136 static bool mode_flag_cmd_line = false;
137
138 struct VMInitArgsGroup {
139 const JavaVMInitArgs* _args;
140 JVMFlagOrigin _origin;
141 };
142
143 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
144 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
145 if (new_value == nullptr) {
146 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
147 return false;
148 }
149 if (_value != nullptr) {
150 FreeHeap(_value);
151 }
152 _value = new_value;
153 strcpy(_value, value);
154 return true;
155 }
156
157 void PathString::append_value(const char *value) {
158 char *sp;
159 size_t len = 0;
160 if (value != nullptr) {
161 len = strlen(value);
162 if (_value != nullptr) {
163 len += strlen(_value);
164 }
165 sp = AllocateHeap(len+2, mtArguments);
166 assert(sp != nullptr, "Unable to allocate space for new append path value");
167 if (sp != nullptr) {
168 if (_value != nullptr) {
169 strcpy(sp, _value);
170 strcat(sp, os::path_separator());
171 strcat(sp, value);
172 FreeHeap(_value);
173 } else {
174 strcpy(sp, value);
175 }
176 _value = sp;
177 }
178 }
179 }
180
181 PathString::PathString(const char* value) {
182 if (value == nullptr) {
183 _value = nullptr;
184 } else {
185 _value = AllocateHeap(strlen(value)+1, mtArguments);
186 strcpy(_value, value);
187 }
188 }
189
190 PathString::~PathString() {
191 if (_value != nullptr) {
192 FreeHeap(_value);
193 _value = nullptr;
194 }
195 }
196
197 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
198 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
199 size_t len = strlen(module_name) + 1;
200 _module_name = AllocateHeap(len, mtInternal);
201 strncpy(_module_name, module_name, len); // copy the trailing null
202 _path = new PathString(path);
203 }
204
205 ModulePatchPath::~ModulePatchPath() {
206 if (_module_name != nullptr) {
207 FreeHeap(_module_name);
208 _module_name = nullptr;
209 }
210 if (_path != nullptr) {
211 delete _path;
212 _path = nullptr;
213 }
214 }
215
216 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
217 if (key == nullptr) {
218 _key = nullptr;
219 } else {
220 _key = AllocateHeap(strlen(key)+1, mtArguments);
221 strcpy(_key, key);
222 }
223 _next = nullptr;
224 _internal = internal;
225 _writeable = writeable;
226 }
227
228 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
229 // part of the option string.
230 static bool match_option(const JavaVMOption *option, const char* name,
231 const char** tail) {
232 size_t len = strlen(name);
233 if (strncmp(option->optionString, name, len) == 0) {
234 *tail = option->optionString + len;
235 return true;
236 } else {
237 return false;
238 }
239 }
240
241 // Check if 'option' matches 'name'. No "tail" is allowed.
242 static bool match_option(const JavaVMOption *option, const char* name) {
243 const char* tail = nullptr;
244 bool result = match_option(option, name, &tail);
245 if (tail != nullptr && *tail == '\0') {
246 return result;
247 } else {
248 return false;
249 }
250 }
251
252 // Return true if any of the strings in null-terminated array 'names' matches.
253 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
254 // the option must match exactly.
255 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
256 bool tail_allowed) {
257 for (/* empty */; *names != nullptr; ++names) {
258 if (match_option(option, *names, tail)) {
259 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
260 return true;
261 }
262 }
263 }
264 return false;
265 }
266
267 #if INCLUDE_JFR
268 static bool _has_jfr_option = false; // is using JFR
269
270 // return true on failure
271 static bool match_jfr_option(const JavaVMOption** option) {
272 assert((*option)->optionString != nullptr, "invariant");
273 char* tail = nullptr;
274 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
275 _has_jfr_option = true;
276 return Jfr::on_start_flight_recording_option(option, tail);
277 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
278 _has_jfr_option = true;
279 return Jfr::on_flight_recorder_option(option, tail);
280 }
281 return false;
282 }
283
284 bool Arguments::has_jfr_option() {
285 return _has_jfr_option;
286 }
287 #endif
288
289 static void logOption(const char* opt) {
290 if (PrintVMOptions) {
291 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
292 }
293 }
294
295 bool needs_module_property_warning = false;
296
297 #define MODULE_PROPERTY_PREFIX "jdk.module."
298 #define MODULE_PROPERTY_PREFIX_LEN 11
299 #define ADDEXPORTS "addexports"
300 #define ADDEXPORTS_LEN 10
301 #define ADDREADS "addreads"
302 #define ADDREADS_LEN 8
303 #define ADDOPENS "addopens"
304 #define ADDOPENS_LEN 8
305 #define PATCH "patch"
306 #define PATCH_LEN 5
307 #define ADDMODS "addmods"
308 #define ADDMODS_LEN 7
309 #define LIMITMODS "limitmods"
310 #define LIMITMODS_LEN 9
311 #define PATH "path"
312 #define PATH_LEN 4
313 #define UPGRADE_PATH "upgrade.path"
314 #define UPGRADE_PATH_LEN 12
315 #define ENABLE_NATIVE_ACCESS "enable.native.access"
316 #define ENABLE_NATIVE_ACCESS_LEN 20
317 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
318 #define ILLEGAL_NATIVE_ACCESS_LEN 21
319 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
320 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
321 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
322 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
323
324 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
325 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
326 return ((strncmp(option, property, len) == 0) &&
327 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
328 }
329
330 // Return true if property starts with "jdk.module." and its ensuing chars match
331 // any of the reserved module properties.
332 // property should be passed without the leading "-D".
333 bool Arguments::is_internal_module_property(const char* property) {
334 return internal_module_property_helper(property, false);
335 }
336
337 // Returns true if property is one of those recognized by is_internal_module_property() but
338 // is not supported by CDS archived full module graph.
339 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
340 return internal_module_property_helper(property, true);
341 }
342
343 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
344 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
345 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
346 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
347 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
348 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
349 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
350 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
351 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
352 return true;
353 }
354
355 if (!check_for_cds) {
356 // CDS notes: these properties are supported by CDS archived full module graph.
357 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
358 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
359 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
360 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
361 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
362 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
363 return true;
364 }
365 }
366 }
367 return false;
368 }
369
370 // Process java launcher properties.
371 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
372 // See if sun.java.launcher is defined.
373 // Must do this before setting up other system properties,
374 // as some of them may depend on launcher type.
375 for (int index = 0; index < args->nOptions; index++) {
376 const JavaVMOption* option = args->options + index;
377 const char* tail;
378
379 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
380 process_java_launcher_argument(tail, option->extraInfo);
381 continue;
382 }
383 if (match_option(option, "-XX:+ExecutingUnitTests")) {
384 _executing_unit_tests = true;
385 continue;
386 }
387 }
388 }
389
390 // Initialize system properties key and value.
391 void Arguments::init_system_properties() {
392
393 // Set up _boot_class_path which is not a property but
394 // relies heavily on argument processing and the jdk.boot.class.path.append
395 // property. It is used to store the underlying boot class path.
396 _boot_class_path = new PathString(nullptr);
397
398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
399 "Java Virtual Machine Specification", false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
402 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
403
404 // Initialize the vm.info now, but it will need updating after argument parsing.
405 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
406
407 // Following are JVMTI agent writable properties.
408 // Properties values are set to nullptr and they are
409 // os specific they are initialized in os::init_system_properties_values().
410 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
411 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
412 _java_home = new SystemProperty("java.home", nullptr, true);
413 _java_class_path = new SystemProperty("java.class.path", "", true);
414 // jdk.boot.class.path.append is a non-writeable, internal property.
415 // It can only be set by either:
416 // - -Xbootclasspath/a:
417 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
418 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
419
420 // Add to System Property list.
421 PropertyList_add(&_system_properties, _sun_boot_library_path);
422 PropertyList_add(&_system_properties, _java_library_path);
423 PropertyList_add(&_system_properties, _java_home);
424 PropertyList_add(&_system_properties, _java_class_path);
425 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
426 PropertyList_add(&_system_properties, _vm_info);
427
428 // Set OS specific system properties values
429 os::init_system_properties_values();
430 }
431
432 // Update/Initialize System properties after JDK version number is known
433 void Arguments::init_version_specific_system_properties() {
434 enum { bufsz = 16 };
435 char buffer[bufsz];
436 const char* spec_vendor = "Oracle Corporation";
437 uint32_t spec_version = JDK_Version::current().major_version();
438
439 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
440
441 PropertyList_add(&_system_properties,
442 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
443 PropertyList_add(&_system_properties,
444 new SystemProperty("java.vm.specification.version", buffer, false));
445 PropertyList_add(&_system_properties,
446 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
447 }
448
449 /*
450 * -XX argument processing:
451 *
452 * -XX arguments are defined in several places, such as:
453 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
454 * -XX arguments are parsed in parse_argument().
455 * -XX argument bounds checking is done in check_vm_args_consistency().
456 *
457 * Over time -XX arguments may change. There are mechanisms to handle common cases:
458 *
459 * ALIASED: An option that is simply another name for another option. This is often
460 * part of the process of deprecating a flag, but not all aliases need
461 * to be deprecated.
462 *
463 * Create an alias for an option by adding the old and new option names to the
464 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
465 *
466 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
467 * support may be removed in the future. Both regular and aliased options may be
468 * deprecated.
469 *
470 * Add a deprecation warning for an option (or alias) by adding an entry in the
471 * "special_jvm_flags" table and setting the "deprecated_in" field.
472 * Often an option "deprecated" in one major release will
473 * be made "obsolete" in the next. In this case the entry should also have its
474 * "obsolete_in" field set.
475 *
476 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
477 * on the command line. A warning is printed to let the user know that option might not
478 * be accepted in the future.
479 *
480 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
481 * table and setting the "obsolete_in" field.
482 *
483 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
484 * to the current JDK version. The system will flatly refuse to admit the existence of
485 * the flag. This allows a flag to die automatically over JDK releases.
486 *
487 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
488 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
489 * - Newly obsolete or expired deprecated options should have their global variable
490 * definitions removed (from globals.hpp, etc) and related implementations removed.
491 *
492 * Recommended approach for removing options:
493 *
494 * To remove options commonly used by customers (e.g. product -XX options), use
495 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
496 *
497 * To remove internal options (e.g. diagnostic, experimental, develop options), use
498 * a 2-step model adding major release numbers to the obsolete and expire columns.
499 *
500 * To change the name of an option, use the alias table as well as a 2-step
501 * model adding major release numbers to the deprecate and expire columns.
502 * Think twice about aliasing commonly used customer options.
503 *
504 * There are times when it is appropriate to leave a future release number as undefined.
505 *
506 * Tests: Aliases should be tested in VMAliasOptions.java.
507 * Deprecated options should be tested in VMDeprecatedOptions.java.
508 */
509
510 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
511 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
512 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
513 // the command-line as usual, but will issue a warning.
514 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
515 // the command-line, while issuing a warning and ignoring the flag value.
516 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
517 // existence of the flag.
518 //
519 // MANUAL CLEANUP ON JDK VERSION UPDATES:
520 // This table ensures that the handling of options will update automatically when the JDK
521 // version is incremented, but the source code needs to be cleanup up manually:
522 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
523 // variable should be removed, as well as users of the variable.
524 // - As "deprecated" options age into "obsolete" options, move the entry into the
525 // "Obsolete Flags" section of the table.
526 // - All expired options should be removed from the table.
527 static SpecialFlag const special_jvm_flags[] = {
528 // -------------- Deprecated Flags --------------
529 // --- Non-alias flags - sorted by obsolete_in then expired_in:
530 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
533 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
534 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
535 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
536 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
537 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
538
539 // -------------- Obsolete Flags - sorted by expired_in --------------
540
541 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
542 #if defined(AARCH64)
543 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
544 #endif
545 #ifdef _LP64
546 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
547 #endif
548
549 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
550 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
551 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
552 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
553 { "NewSizeThreadIncrease", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
554 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
555 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
556 { "UseXMMForArrayCopy", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
557 { "UseNewLongLShift", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
558 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
559
560 #ifdef ASSERT
561 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
562 #endif
563
564 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
565 // These entries will generate build errors. Their purpose is to test the macros.
566 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
567 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
568 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
569 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
570 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
571 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
572 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
573 #endif
574
575 { nullptr, JDK_Version(0), JDK_Version(0) }
576 };
577
578 // Flags that are aliases for other flags.
579 typedef struct {
580 const char* alias_name;
581 const char* real_name;
582 } AliasedFlag;
583
584 static AliasedFlag const aliased_jvm_flags[] = {
585 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
586 { nullptr, nullptr}
587 };
588
589 // Return true if "v" is less than "other", where "other" may be "undefined".
590 static bool version_less_than(JDK_Version v, JDK_Version other) {
591 assert(!v.is_undefined(), "must be defined");
592 if (!other.is_undefined() && v.compare(other) >= 0) {
593 return false;
594 } else {
595 return true;
596 }
597 }
598
599 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
600 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
601 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
602 flag = special_jvm_flags[i];
603 return true;
604 }
605 }
606 return false;
607 }
608
609 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
610 assert(version != nullptr, "Must provide a version buffer");
611 SpecialFlag flag;
612 if (lookup_special_flag(flag_name, flag)) {
613 if (!flag.obsolete_in.is_undefined()) {
614 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
615 *version = flag.obsolete_in;
616 // This flag may have been marked for obsoletion in this version, but we may not
617 // have actually removed it yet. Rather than ignoring it as soon as we reach
618 // this version we allow some time for the removal to happen. So if the flag
619 // still actually exists we process it as normal, but issue an adjusted warning.
620 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
621 if (real_flag != nullptr) {
622 char version_str[256];
623 version->to_string(version_str, sizeof(version_str));
624 warning("Temporarily processing option %s; support is scheduled for removal in %s",
625 flag_name, version_str);
626 return false;
627 }
628 return true;
629 }
630 }
631 }
632 return false;
633 }
634
635 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
636 assert(version != nullptr, "Must provide a version buffer");
637 SpecialFlag flag;
638 if (lookup_special_flag(flag_name, flag)) {
639 if (!flag.deprecated_in.is_undefined()) {
640 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
641 version_less_than(JDK_Version::current(), flag.expired_in)) {
642 *version = flag.deprecated_in;
643 return 1;
644 } else {
645 return -1;
646 }
647 }
648 }
649 return 0;
650 }
651
652 const char* Arguments::real_flag_name(const char *flag_name) {
653 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
654 const AliasedFlag& flag_status = aliased_jvm_flags[i];
655 if (strcmp(flag_status.alias_name, flag_name) == 0) {
656 return flag_status.real_name;
657 }
658 }
659 return flag_name;
660 }
661
662 #ifdef ASSERT
663 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
664 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
665 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
666 return true;
667 }
668 }
669 return false;
670 }
671
672 // Verifies the correctness of the entries in the special_jvm_flags table.
673 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
674 // version being earlier than the deprecation version, then a warning is issued
675 // and verification fails - by returning false. If it is detected that the table
676 // is out of date, with respect to the current version, then ideally a warning is
677 // issued but verification does not fail. This allows the VM to operate when the
678 // version is first updated, without needing to update all the impacted flags at
679 // the same time. In practice we can't issue the warning immediately when the version
680 // is updated as it occurs for every test and some tests are not prepared to handle
681 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
682 // if the check_globals flag is true, and in addition allow a grace period and only
683 // check for stale flags when we hit build 25 (which is far enough into the 6 month
684 // release cycle that all flag updates should have been processed, whilst still
685 // leaving time to make the change before RDP2).
686 // We use a gtest to call this, passing true, so that we can detect stale flags before
687 // the end of the release cycle.
688
689 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
690
691 bool Arguments::verify_special_jvm_flags(bool check_globals) {
692 bool success = true;
693 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
694 const SpecialFlag& flag = special_jvm_flags[i];
695 if (lookup_special_flag(flag.name, i)) {
696 warning("Duplicate special flag declaration \"%s\"", flag.name);
697 success = false;
698 }
699 if (flag.deprecated_in.is_undefined() &&
700 flag.obsolete_in.is_undefined()) {
701 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
702 success = false;
703 }
704
705 if (!flag.deprecated_in.is_undefined()) {
706 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
707 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
708 success = false;
709 }
710
711 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
712 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
713 success = false;
714 }
715 }
716
717 if (!flag.obsolete_in.is_undefined()) {
718 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
719 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
720 success = false;
721 }
722
723 // if flag has become obsolete it should not have a "globals" flag defined anymore.
724 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
725 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
726 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
727 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
728 success = false;
729 }
730 }
731
732 } else if (!flag.expired_in.is_undefined()) {
733 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
734 success = false;
735 }
736
737 if (!flag.expired_in.is_undefined()) {
738 // if flag has become expired it should not have a "globals" flag defined anymore.
739 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
740 !version_less_than(JDK_Version::current(), flag.expired_in)) {
741 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
742 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
743 success = false;
744 }
745 }
746 }
747 }
748 return success;
749 }
750 #endif
751
752 bool Arguments::atojulong(const char *s, julong* result) {
753 return parse_integer(s, result);
754 }
755
756 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
757 if (size < min_size) return arg_too_small;
758 if (size > max_size) return arg_too_big;
759 return arg_in_range;
760 }
761
762 // Describe an argument out of range error
763 void Arguments::describe_range_error(ArgsRange errcode) {
764 switch(errcode) {
765 case arg_too_big:
766 jio_fprintf(defaultStream::error_stream(),
767 "The specified size exceeds the maximum "
768 "representable size.\n");
769 break;
770 case arg_too_small:
771 case arg_unreadable:
772 case arg_in_range:
773 // do nothing for now
774 break;
775 default:
776 ShouldNotReachHere();
777 }
778 }
779
780 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
781 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
782 return true;
783 } else {
784 return false;
785 }
786 }
787
788 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
789 // strtod allows leading whitespace, but our flag format does not.
790 if (*value == '\0' || isspace((unsigned char) *value)) {
791 return false;
792 }
793 char* end;
794 errno = 0;
795 double v = strtod(value, &end);
796 if ((errno != 0) || (*end != 0)) {
797 return false;
798 }
799 if (g_isnan(v) || !g_isfinite(v)) {
800 // Currently we cannot handle these special values.
801 return false;
802 }
803
804 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
805 return true;
806 }
807 return false;
808 }
809
810 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
811 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
812
813 if (flag->is_int()) {
814 int v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_int(flag, &v, origin);
817 }
818 } else if (flag->is_uint()) {
819 uint v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_uint(flag, &v, origin);
822 }
823 } else if (flag->is_intx()) {
824 intx v;
825 if (parse_integer(value, &v)) {
826 result = JVMFlagAccess::set_intx(flag, &v, origin);
827 }
828 } else if (flag->is_uintx()) {
829 uintx v;
830 if (parse_integer(value, &v)) {
831 result = JVMFlagAccess::set_uintx(flag, &v, origin);
832 }
833 } else if (flag->is_uint64_t()) {
834 uint64_t v;
835 if (parse_integer(value, &v)) {
836 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
837 }
838 } else if (flag->is_size_t()) {
839 size_t v;
840 if (parse_integer(value, &v)) {
841 result = JVMFlagAccess::set_size_t(flag, &v, origin);
842 }
843 }
844
845 return result == JVMFlag::SUCCESS;
846 }
847
848 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
849 if (value[0] == '\0') {
850 value = nullptr;
851 }
852 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
853 // Contract: JVMFlag always returns a pointer that needs freeing.
854 FREE_C_HEAP_ARRAY(value);
855 return true;
856 }
857
858 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
859 const char* old_value = "";
860 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
861 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
862 size_t new_len = strlen(new_value);
863 const char* value;
864 char* free_this_too = nullptr;
865 if (old_len == 0) {
866 value = new_value;
867 } else if (new_len == 0) {
868 value = old_value;
869 } else {
870 size_t length = old_len + 1 + new_len + 1;
871 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
872 // each new setting adds another LINE to the switch:
873 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
874 value = buf;
875 free_this_too = buf;
876 }
877 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
878 // JVMFlag always returns a pointer that needs freeing.
879 FREE_C_HEAP_ARRAY(value);
880 // JVMFlag made its own copy, so I must delete my own temp. buffer.
881 FREE_C_HEAP_ARRAY(free_this_too);
882 return true;
883 }
884
885 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
886 const char* real_name = real_flag_name(arg);
887 JDK_Version since = JDK_Version();
888 switch (is_deprecated_flag(arg, &since)) {
889 case -1: {
890 // Obsolete or expired, so don't process normally,
891 // but allow for an obsolete flag we're still
892 // temporarily allowing.
893 if (!is_obsolete_flag(arg, &since)) {
894 return real_name;
895 }
896 // Note if we're not considered obsolete then we can't be expired either
897 // as obsoletion must come first.
898 return nullptr;
899 }
900 case 0:
901 return real_name;
902 case 1: {
903 char version[256];
904 since.to_string(version, sizeof(version));
905 if (real_name != arg) {
906 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
907 arg, version, real_name);
908 } else {
909 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
910 arg, version);
911 }
912 return real_name;
913 }
914 }
915 ShouldNotReachHere();
916 return nullptr;
917 }
918
919 #define BUFLEN 255
920
921 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
922 char name_copied[BUFLEN+1];
923 if (name[name_length] != 0) {
924 if (name_length > BUFLEN) {
925 return nullptr;
926 } else {
927 strncpy(name_copied, name, name_length);
928 name_copied[name_length] = '\0';
929 name = name_copied;
930 }
931 }
932
933 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
934 if (real_name == nullptr) {
935 return nullptr;
936 }
937 JVMFlag* flag = JVMFlag::find_flag(real_name);
938 return flag;
939 }
940
941 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
942 bool is_bool = false;
943 bool bool_val = false;
944 char c = *arg;
945 if (c == '+' || c == '-') {
946 is_bool = true;
947 bool_val = (c == '+');
948 arg++;
949 }
950
951 const char* name = arg;
952 while (true) {
953 c = *arg;
954 if (isalnum(c) || (c == '_')) {
955 ++arg;
956 } else {
957 break;
958 }
959 }
960
961 size_t name_len = size_t(arg - name);
962 if (name_len == 0) {
963 return false;
964 }
965
966 JVMFlag* flag = find_jvm_flag(name, name_len);
967 if (flag == nullptr) {
968 return false;
969 }
970
971 if (is_bool) {
972 if (*arg != 0) {
973 // Error -- extra characters such as -XX:+BoolFlag=123
974 return false;
975 }
976 return set_bool_flag(flag, bool_val, origin);
977 }
978
979 if (arg[0] == '=') {
980 const char* value = arg + 1;
981 if (flag->is_ccstr()) {
982 if (flag->ccstr_accumulates()) {
983 return append_to_string_flag(flag, value, origin);
984 } else {
985 return set_string_flag(flag, value, origin);
986 }
987 } else if (flag->is_double()) {
988 return set_fp_numeric_flag(flag, value, origin);
989 } else {
990 return set_numeric_flag(flag, value, origin);
991 }
992 }
993
994 if (arg[0] == ':' && arg[1] == '=') {
995 // -XX:Foo:=xxx will reset the string flag to the given value.
996 const char* value = arg + 2;
997 return set_string_flag(flag, value, origin);
998 }
999
1000 return false;
1001 }
1002
1003 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1004 assert(bldarray != nullptr, "illegal argument");
1005
1006 if (arg == nullptr) {
1007 return;
1008 }
1009
1010 int new_count = *count + 1;
1011
1012 // expand the array and add arg to the last element
1013 if (*bldarray == nullptr) {
1014 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1015 } else {
1016 *bldarray = REALLOC_C_HEAP_ARRAY(*bldarray, new_count, mtArguments);
1017 }
1018 (*bldarray)[*count] = os::strdup_check_oom(arg);
1019 *count = new_count;
1020 }
1021
1022 void Arguments::build_jvm_args(const char* arg) {
1023 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1024 }
1025
1026 void Arguments::build_jvm_flags(const char* arg) {
1027 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1028 }
1029
1030 // utility function to return a string that concatenates all
1031 // strings in a given char** array
1032 const char* Arguments::build_resource_string(char** args, int count) {
1033 if (args == nullptr || count == 0) {
1034 return nullptr;
1035 }
1036 size_t length = 0;
1037 for (int i = 0; i < count; i++) {
1038 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1039 }
1040 char* s = NEW_RESOURCE_ARRAY(char, length);
1041 char* dst = s;
1042 for (int j = 0; j < count; j++) {
1043 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1044 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1045 dst += offset;
1046 length -= offset;
1047 }
1048 return (const char*) s;
1049 }
1050
1051 void Arguments::print_on(outputStream* st) {
1052 st->print_cr("VM Arguments:");
1053 if (num_jvm_flags() > 0) {
1054 st->print("jvm_flags: "); print_jvm_flags_on(st);
1055 st->cr();
1056 }
1057 if (num_jvm_args() > 0) {
1058 st->print("jvm_args: "); print_jvm_args_on(st);
1059 st->cr();
1060 }
1061 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1062 if (_java_class_path != nullptr) {
1063 char* path = _java_class_path->value();
1064 size_t len = strlen(path);
1065 st->print("java_class_path (initial): ");
1066 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1067 if (len == 0) {
1068 st->print_raw_cr("<not set>");
1069 } else {
1070 st->print_raw_cr(path, len);
1071 }
1072 }
1073 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1074 }
1075
1076 void Arguments::print_summary_on(outputStream* st) {
1077 // Print the command line. Environment variables that are helpful for
1078 // reproducing the problem are written later in the hs_err file.
1079 // flags are from setting file
1080 if (num_jvm_flags() > 0) {
1081 st->print_raw("Settings File: ");
1082 print_jvm_flags_on(st);
1083 st->cr();
1084 }
1085 // args are the command line and environment variable arguments.
1086 st->print_raw("Command Line: ");
1087 if (num_jvm_args() > 0) {
1088 print_jvm_args_on(st);
1089 }
1090 // this is the classfile and any arguments to the java program
1091 if (java_command() != nullptr) {
1092 st->print("%s", java_command());
1093 }
1094 st->cr();
1095 }
1096
1097 void Arguments::set_jvm_flags_file(const char *value) {
1098 if (_jvm_flags_file != nullptr) {
1099 os::free(_jvm_flags_file);
1100 }
1101 _jvm_flags_file = os::strdup_check_oom(value);
1102 }
1103
1104 void Arguments::print_jvm_flags_on(outputStream* st) {
1105 if (_num_jvm_flags > 0) {
1106 for (int i=0; i < _num_jvm_flags; i++) {
1107 st->print("%s ", _jvm_flags_array[i]);
1108 }
1109 }
1110 }
1111
1112 void Arguments::print_jvm_args_on(outputStream* st) {
1113 if (_num_jvm_args > 0) {
1114 for (int i=0; i < _num_jvm_args; i++) {
1115 st->print("%s ", _jvm_args_array[i]);
1116 }
1117 }
1118 }
1119
1120 bool Arguments::process_argument(const char* arg,
1121 jboolean ignore_unrecognized,
1122 JVMFlagOrigin origin) {
1123 JDK_Version since = JDK_Version();
1124
1125 if (parse_argument(arg, origin)) {
1126 return true;
1127 }
1128
1129 // Determine if the flag has '+', '-', or '=' characters.
1130 bool has_plus_minus = (*arg == '+' || *arg == '-');
1131 const char* const argname = has_plus_minus ? arg + 1 : arg;
1132
1133 size_t arg_len;
1134 const char* equal_sign = strchr(argname, '=');
1135 if (equal_sign == nullptr) {
1136 arg_len = strlen(argname);
1137 } else {
1138 arg_len = equal_sign - argname;
1139 }
1140
1141 // Only make the obsolete check for valid arguments.
1142 if (arg_len <= BUFLEN) {
1143 // Construct a string which consists only of the argument name without '+', '-', or '='.
1144 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1145 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1146 if (is_obsolete_flag(stripped_argname, &since)) {
1147 char version[256];
1148 since.to_string(version, sizeof(version));
1149 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1150 return true;
1151 }
1152 }
1153
1154 // For locked flags, report a custom error message if available.
1155 // Otherwise, report the standard unrecognized VM option.
1156 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1157 if (found_flag != nullptr) {
1158 char locked_message_buf[BUFLEN];
1159 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1160 if (strlen(locked_message_buf) != 0) {
1161 #ifdef PRODUCT
1162 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1163 if (ignore_unrecognized && mismatched) {
1164 return true;
1165 }
1166 #endif
1167 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1168 }
1169 if (found_flag->is_bool() && !has_plus_minus) {
1170 jio_fprintf(defaultStream::error_stream(),
1171 "Missing +/- setting for VM option '%s'\n", argname);
1172 } else if (!found_flag->is_bool() && has_plus_minus) {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "Unexpected +/- setting in VM option '%s'\n", argname);
1175 } else {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Improperly specified VM option '%s'\n", argname);
1178 }
1179 } else {
1180 if (ignore_unrecognized) {
1181 return true;
1182 }
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Unrecognized VM option '%s'\n", argname);
1185 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1186 if (fuzzy_matched != nullptr) {
1187 jio_fprintf(defaultStream::error_stream(),
1188 "Did you mean '%s%s%s'?\n",
1189 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1190 fuzzy_matched->name(),
1191 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1192 }
1193 }
1194
1195 // allow for commandline "commenting out" options like -XX:#+Verbose
1196 return arg[0] == '#';
1197 }
1198
1199 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1200 FILE* stream = os::fopen(file_name, "rb");
1201 if (stream == nullptr) {
1202 if (should_exist) {
1203 jio_fprintf(defaultStream::error_stream(),
1204 "Could not open settings file %s\n", file_name);
1205 return false;
1206 } else {
1207 return true;
1208 }
1209 }
1210
1211 char token[1024];
1212 size_t pos = 0;
1213
1214 bool in_white_space = true;
1215 bool in_comment = false;
1216 bool in_quote = false;
1217 char quote_c = 0;
1218 bool result = true;
1219
1220 int c_or_eof = getc(stream);
1221 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1222 // We have checked the c_or_eof for EOF. getc should only ever return the
1223 // EOF or an unsigned char converted to an int. We cast down to a char to
1224 // avoid the char to int promotions we would otherwise do in the comparisons
1225 // below (which would be incorrect if we ever compared to a non-ascii char),
1226 // and the int to char conversions we would otherwise do in the assignments.
1227 const char c = static_cast<char>(c_or_eof);
1228 if (in_white_space) {
1229 if (in_comment) {
1230 if (c == '\n') in_comment = false;
1231 } else {
1232 if (c == '#') in_comment = true;
1233 else if (!isspace((unsigned char) c)) {
1234 in_white_space = false;
1235 token[pos++] = c;
1236 }
1237 }
1238 } else {
1239 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1240 // token ends at newline, or at unquoted whitespace
1241 // this allows a way to include spaces in string-valued options
1242 token[pos] = '\0';
1243 logOption(token);
1244 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1245 build_jvm_flags(token);
1246 pos = 0;
1247 in_white_space = true;
1248 in_quote = false;
1249 } else if (!in_quote && (c == '\'' || c == '"')) {
1250 in_quote = true;
1251 quote_c = c;
1252 } else if (in_quote && (c == quote_c)) {
1253 in_quote = false;
1254 } else {
1255 token[pos++] = c;
1256 }
1257 }
1258 c_or_eof = getc(stream);
1259 }
1260 if (pos > 0) {
1261 token[pos] = '\0';
1262 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1263 build_jvm_flags(token);
1264 }
1265 fclose(stream);
1266 return result;
1267 }
1268
1269 //=============================================================================================================
1270 // Parsing of properties (-D)
1271
1272 const char* Arguments::get_property(const char* key) {
1273 return PropertyList_get_value(system_properties(), key);
1274 }
1275
1276 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1277 const char* eq = strchr(prop, '=');
1278 const char* key;
1279 const char* value = "";
1280
1281 if (eq == nullptr) {
1282 // property doesn't have a value, thus use passed string
1283 key = prop;
1284 } else {
1285 // property have a value, thus extract it and save to the
1286 // allocated string
1287 size_t key_len = eq - prop;
1288 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1289
1290 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1291 key = tmp_key;
1292
1293 value = &prop[key_len + 1];
1294 }
1295
1296 if (internal == ExternalProperty) {
1297 CDSConfig::check_incompatible_property(key, value);
1298 }
1299
1300 if (strcmp(key, "java.compiler") == 0) {
1301 // we no longer support java.compiler system property, log a warning and let it get
1302 // passed to Java, like any other system property
1303 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1304 // for applications using NONE or empty value, log a more informative message
1305 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1306 } else {
1307 warning("The java.compiler system property is obsolete and no longer supported.");
1308 }
1309 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1310 // append is true, writable is true, internal is false
1311 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1312 WriteableProperty, ExternalProperty);
1313 } else {
1314 if (strcmp(key, "sun.java.command") == 0) {
1315 char *old_java_command = _java_command;
1316 _java_command = os::strdup_check_oom(value, mtArguments);
1317 if (old_java_command != nullptr) {
1318 os::free(old_java_command);
1319 }
1320 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1321 // If this property is set on the command line then its value will be
1322 // displayed in VM error logs as the URL at which to submit such logs.
1323 // Normally the URL displayed in error logs is different from the value
1324 // of this system property, so a different property should have been
1325 // used here, but we leave this as-is in case someone depends upon it.
1326 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1327 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1328 // its value without going through the property list or making a Java call.
1329 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1330 if (old_java_vendor_url_bug != nullptr) {
1331 os::free((void *)old_java_vendor_url_bug);
1332 }
1333 }
1334
1335 // Create new property and add at the end of the list
1336 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1337 }
1338
1339 if (key != prop) {
1340 // SystemProperty copy passed value, thus free previously allocated
1341 // memory
1342 FreeHeap((void *)key);
1343 }
1344
1345 return true;
1346 }
1347
1348 //===========================================================================================================
1349 // Setting int/mixed/comp mode flags
1350
1351 void Arguments::set_mode_flags(Mode mode) {
1352 // Set up default values for all flags.
1353 // If you add a flag to any of the branches below,
1354 // add a default value for it here.
1355 _mode = mode;
1356
1357 // Ensure Agent_OnLoad has the correct initial values.
1358 // This may not be the final mode; mode may change later in onload phase.
1359 PropertyList_unique_add(&_system_properties, "java.vm.info",
1360 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1361
1362 UseInterpreter = true;
1363 UseCompiler = true;
1364 UseLoopCounter = true;
1365
1366 // Default values may be platform/compiler dependent -
1367 // use the saved values
1368 ClipInlining = Arguments::_ClipInlining;
1369 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1370 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1371 BackgroundCompilation = Arguments::_BackgroundCompilation;
1372
1373 // Change from defaults based on mode
1374 switch (mode) {
1375 default:
1376 ShouldNotReachHere();
1377 break;
1378 case _int:
1379 UseCompiler = false;
1380 UseLoopCounter = false;
1381 AlwaysCompileLoopMethods = false;
1382 UseOnStackReplacement = false;
1383 break;
1384 case _mixed:
1385 // same as default
1386 break;
1387 case _comp:
1388 UseInterpreter = false;
1389 BackgroundCompilation = false;
1390 ClipInlining = false;
1391 break;
1392 }
1393 }
1394
1395 // Conflict: required to use shared spaces (-Xshare:on), but
1396 // incompatible command line options were chosen.
1397 void Arguments::no_shared_spaces(const char* message) {
1398 if (RequireSharedSpaces) {
1399 aot_log_error(aot)("%s is incompatible with other specified options.",
1400 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1401 if (CDSConfig::new_aot_flags_used()) {
1402 vm_exit_during_initialization("Unable to use AOT cache", message);
1403 } else {
1404 vm_exit_during_initialization("Unable to use shared archive", message);
1405 }
1406 } else {
1407 if (CDSConfig::new_aot_flags_used()) {
1408 log_warning(aot)("Unable to use AOT cache: %s", message);
1409 } else {
1410 aot_log_info(aot)("Unable to use shared archive: %s", message);
1411 }
1412 UseSharedSpaces = false;
1413 }
1414 }
1415
1416 static void set_object_alignment() {
1417 // Object alignment.
1418 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1419 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1420 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1421 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1422 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1423 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1424
1425 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1426 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1427
1428 // Oop encoding heap max
1429 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1430 }
1431
1432 size_t Arguments::max_heap_for_compressed_oops() {
1433 // Avoid sign flip.
1434 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1435 // We need to fit both the null page and the heap into the memory budget, while
1436 // keeping alignment constraints of the heap. To guarantee the latter, as the
1437 // null page is located before the heap, we pad the null page to the conservative
1438 // maximum alignment that the GC may ever impose upon the heap.
1439 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1440 _conservative_max_heap_alignment);
1441
1442 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1443 NOT_LP64(ShouldNotReachHere(); return 0);
1444 }
1445
1446 void Arguments::set_use_compressed_oops() {
1447 #ifdef _LP64
1448 // MaxHeapSize is not set up properly at this point, but
1449 // the only value that can override MaxHeapSize if we are
1450 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1451 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1452
1453 if (max_heap_size <= max_heap_for_compressed_oops()) {
1454 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1455 FLAG_SET_ERGO(UseCompressedOops, true);
1456 }
1457 } else {
1458 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1459 warning("Max heap size too large for Compressed Oops");
1460 FLAG_SET_DEFAULT(UseCompressedOops, false);
1461 }
1462 }
1463 #endif // _LP64
1464 }
1465
1466 void Arguments::set_conservative_max_heap_alignment() {
1467 // The conservative maximum required alignment for the heap is the maximum of
1468 // the alignments imposed by several sources: any requirements from the heap
1469 // itself and the maximum page size we may run the VM with.
1470 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1471 _conservative_max_heap_alignment = MAX3(heap_alignment,
1472 os::vm_allocation_granularity(),
1473 os::max_page_size());
1474 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1475 }
1476
1477 jint Arguments::set_ergonomics_flags() {
1478 GCConfig::initialize();
1479
1480 set_conservative_max_heap_alignment();
1481
1482 #ifdef _LP64
1483 set_use_compressed_oops();
1484
1485 // Also checks that certain machines are slower with compressed oops
1486 // in vm_version initialization code.
1487 #endif // _LP64
1488
1489 return JNI_OK;
1490 }
1491
1492 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1493 size_t fraction = MaxVirtMemFraction * GCConfig::arguments()->heap_virtual_to_physical_ratio();
1494 size_t max_allocatable = os::commit_memory_limit();
1495
1496 return MIN2(limit, max_allocatable / fraction);
1497 }
1498
1499 // Use static initialization to get the default before parsing
1500 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1501
1502 static size_t clamp_by_size_t_max(uint64_t value) {
1503 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1504 }
1505
1506 void Arguments::set_heap_size() {
1507 // Check if the user has configured any limit on the amount of RAM we may use.
1508 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1509 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1510 !FLAG_IS_DEFAULT(InitialRAMPercentage);
1511
1512 const physical_memory_size_type avail_mem = os::physical_memory();
1513
1514 // If the maximum heap size has not been set with -Xmx, then set it as
1515 // fraction of the size of physical memory, respecting the maximum and
1516 // minimum sizes of the heap.
1517 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1518 uint64_t min_memory = (uint64_t)(((double)avail_mem * MinRAMPercentage) / 100);
1519 uint64_t max_memory = (uint64_t)(((double)avail_mem * MaxRAMPercentage) / 100);
1520
1521 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1522 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1523
1524 if (reasonable_min < MaxHeapSize) {
1525 // Small physical memory, so use a minimum fraction of it for the heap
1526 reasonable_max = reasonable_min;
1527 } else {
1528 // Not-small physical memory, so require a heap at least
1529 // as large as MaxHeapSize
1530 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1531 }
1532
1533 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1534 // Limit the heap size to ErgoHeapSizeLimit
1535 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1536 }
1537
1538 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1539
1540 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1541 // An initial heap size was specified on the command line,
1542 // so be sure that the maximum size is consistent. Done
1543 // after call to limit_heap_by_allocatable_memory because that
1544 // method might reduce the allocation size.
1545 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1546 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1547 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1548 }
1549
1550 #ifdef _LP64
1551 if (UseCompressedOops) {
1552 // HeapBaseMinAddress can be greater than default but not less than.
1553 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1554 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1555 // matches compressed oops printing flags
1556 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1557 "(%zuG) which is greater than value given %zu",
1558 DefaultHeapBaseMinAddress,
1559 DefaultHeapBaseMinAddress/G,
1560 HeapBaseMinAddress);
1561 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1562 }
1563 }
1564
1565 uintptr_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1566 uintptr_t max_coop_heap = max_heap_for_compressed_oops();
1567
1568 // Limit the heap size to the maximum possible when using compressed oops
1569 if (heap_end < max_coop_heap) {
1570 // Heap should be above HeapBaseMinAddress to get zero based compressed
1571 // oops but it should be not less than default MaxHeapSize.
1572 max_coop_heap -= HeapBaseMinAddress;
1573 }
1574
1575 // If the user has configured any limit on the amount of RAM we may use,
1576 // then disable compressed oops if the calculated max exceeds max_coop_heap
1577 // and UseCompressedOops was not specified.
1578 if (reasonable_max > max_coop_heap) {
1579 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1580 log_debug(gc, heap, coops)("UseCompressedOops disabled due to "
1581 "max heap %zu > compressed oop heap %zu. "
1582 "Please check the setting of MaxRAMPercentage %5.2f.",
1583 reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1584 FLAG_SET_ERGO(UseCompressedOops, false);
1585 } else {
1586 reasonable_max = max_coop_heap;
1587 }
1588 }
1589 }
1590 #endif // _LP64
1591
1592 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1593 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1594 }
1595
1596 // If the minimum or initial heap_size have not been set or requested to be set
1597 // ergonomically, set them accordingly.
1598 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1599 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1600 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1601 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1602
1603 if (InitialHeapSize == 0) {
1604 uint64_t initial_memory = (uint64_t)(((double)avail_mem * InitialRAMPercentage) / 100);
1605 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1606 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1607
1608 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1609 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1610
1611 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1612 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1613 }
1614
1615 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1616 // synchronize with InitialHeapSize to avoid errors with the default value.
1617 if (MinHeapSize == 0) {
1618 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1619 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1620 }
1621 }
1622 }
1623
1624 // This must be called after ergonomics.
1625 void Arguments::set_bytecode_flags() {
1626 if (!RewriteBytecodes) {
1627 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1628 }
1629 }
1630
1631 // Aggressive optimization flags
1632 jint Arguments::set_aggressive_opts_flags() {
1633 #ifdef COMPILER2
1634 if (AggressiveUnboxing) {
1635 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1636 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1637 } else if (!EliminateAutoBox) {
1638 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1639 AggressiveUnboxing = false;
1640 }
1641 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1642 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1643 } else if (!DoEscapeAnalysis) {
1644 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1645 AggressiveUnboxing = false;
1646 }
1647 }
1648 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1649 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1650 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1651 }
1652 // Feed the cache size setting into the JDK
1653 char buffer[1024];
1654 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1655 if (!add_property(buffer)) {
1656 return JNI_ENOMEM;
1657 }
1658 }
1659 #endif
1660
1661 return JNI_OK;
1662 }
1663
1664 //===========================================================================================================
1665
1666 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1667 if (_sun_java_launcher != _default_java_launcher) {
1668 os::free(const_cast<char*>(_sun_java_launcher));
1669 }
1670 _sun_java_launcher = os::strdup_check_oom(launcher);
1671 }
1672
1673 bool Arguments::created_by_java_launcher() {
1674 assert(_sun_java_launcher != nullptr, "property must have value");
1675 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1676 }
1677
1678 bool Arguments::executing_unit_tests() {
1679 return _executing_unit_tests;
1680 }
1681
1682 //===========================================================================================================
1683 // Parsing of main arguments
1684
1685 static unsigned int addreads_count = 0;
1686 static unsigned int addexports_count = 0;
1687 static unsigned int addopens_count = 0;
1688 static unsigned int patch_mod_count = 0;
1689 static unsigned int enable_native_access_count = 0;
1690 static unsigned int enable_final_field_mutation = 0;
1691 static bool patch_mod_javabase = false;
1692
1693 // Check the consistency of vm_init_args
1694 bool Arguments::check_vm_args_consistency() {
1695 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1696 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1697 return false;
1698 }
1699
1700 // Method for adding checks for flag consistency.
1701 // The intent is to warn the user of all possible conflicts,
1702 // before returning an error.
1703 // Note: Needs platform-dependent factoring.
1704 bool status = true;
1705
1706 status = CompilerConfig::check_args_consistency(status);
1707 #if INCLUDE_JVMCI
1708 if (status && EnableJVMCI) {
1709 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1710 // was explicitly set on the command line or in the jimage.
1711 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1712 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1713 return false;
1714 }
1715 }
1716 }
1717 #endif
1718
1719 #if INCLUDE_JFR
1720 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1721 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1722 return false;
1723 }
1724 }
1725 #endif
1726
1727 #ifndef SUPPORT_RESERVED_STACK_AREA
1728 if (StackReservedPages != 0) {
1729 FLAG_SET_CMDLINE(StackReservedPages, 0);
1730 warning("Reserved Stack Area not supported on this platform");
1731 }
1732 #endif
1733
1734 return status;
1735 }
1736
1737 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1738 const char* option_type) {
1739 if (ignore) return false;
1740
1741 const char* spacer = " ";
1742 if (option_type == nullptr) {
1743 option_type = ++spacer; // Set both to the empty string.
1744 }
1745
1746 jio_fprintf(defaultStream::error_stream(),
1747 "Unrecognized %s%soption: %s\n", option_type, spacer,
1748 option->optionString);
1749 return true;
1750 }
1751
1752 static const char* user_assertion_options[] = {
1753 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1754 };
1755
1756 static const char* system_assertion_options[] = {
1757 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1758 };
1759
1760 bool Arguments::parse_uint(const char* value,
1761 uint* uint_arg,
1762 uint min_size) {
1763 uint n;
1764 if (!parse_integer(value, &n)) {
1765 return false;
1766 }
1767 if (n >= min_size) {
1768 *uint_arg = n;
1769 return true;
1770 } else {
1771 return false;
1772 }
1773 }
1774
1775 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1776 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1777 CDSConfig::check_internal_module_property(prop_name, prop_value);
1778 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1779 char* property = AllocateHeap(prop_len, mtArguments);
1780 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1781 if (ret < 0 || ret >= (int)prop_len) {
1782 FreeHeap(property);
1783 return false;
1784 }
1785 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1786 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1787 // that multiple occurrences of the associated flag just causes the existing property value to be
1788 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1789 // to a property after we have finished flag processing.
1790 bool added = add_property(property, WriteableProperty, internal);
1791 FreeHeap(property);
1792 return added;
1793 }
1794
1795 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1796 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1797 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1798 const unsigned int props_count_limit = 1000;
1799 const int max_digits = 3;
1800 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1801
1802 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1803 if (count < props_count_limit) {
1804 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1805 char* property = AllocateHeap(prop_len, mtArguments);
1806 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1807 if (ret < 0 || ret >= (int)prop_len) {
1808 FreeHeap(property);
1809 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1810 return false;
1811 }
1812 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1813 FreeHeap(property);
1814 return added;
1815 }
1816
1817 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1818 return false;
1819 }
1820
1821 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1822 julong* long_arg,
1823 julong min_size,
1824 julong max_size) {
1825 if (!parse_integer(s, long_arg)) return arg_unreadable;
1826 return check_memory_size(*long_arg, min_size, max_size);
1827 }
1828
1829 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1830 // Save default settings for some mode flags
1831 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1832 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1833 Arguments::_ClipInlining = ClipInlining;
1834 Arguments::_BackgroundCompilation = BackgroundCompilation;
1835
1836 // Remember the default value of SharedBaseAddress.
1837 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1838
1839 // Setup flags for mixed which is the default
1840 set_mode_flags(_mixed);
1841
1842 jint result;
1843 for (int i = 0; i < all_args->length(); i++) {
1844 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1845 if (result != JNI_OK) {
1846 return result;
1847 }
1848 }
1849
1850 // Disable CDS for exploded image
1851 if (!has_jimage()) {
1852 no_shared_spaces("CDS disabled on exploded JDK");
1853 }
1854
1855 // We need to ensure processor and memory resources have been properly
1856 // configured - which may rely on arguments we just processed - before
1857 // doing the final argument processing. Any argument processing that
1858 // needs to know about processor and memory resources must occur after
1859 // this point.
1860
1861 os::init_container_support();
1862
1863 SystemMemoryBarrier::initialize();
1864
1865 // Do final processing now that all arguments have been parsed
1866 result = finalize_vm_init_args();
1867 if (result != JNI_OK) {
1868 return result;
1869 }
1870
1871 return JNI_OK;
1872 }
1873
1874 #if !INCLUDE_JVMTI || INCLUDE_CDS
1875 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1876 // represents a valid JDWP agent. is_path==true denotes that we
1877 // are dealing with -agentpath (case where name is a path), otherwise with
1878 // -agentlib
1879 static bool valid_jdwp_agent(char *name, bool is_path) {
1880 char *_name;
1881 const char *_jdwp = "jdwp";
1882 size_t _len_jdwp, _len_prefix;
1883
1884 if (is_path) {
1885 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
1886 return false;
1887 }
1888
1889 _name++; // skip past last path separator
1890 _len_prefix = strlen(JNI_LIB_PREFIX);
1891
1892 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
1893 return false;
1894 }
1895
1896 _name += _len_prefix;
1897 _len_jdwp = strlen(_jdwp);
1898
1899 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
1900 _name += _len_jdwp;
1901 }
1902 else {
1903 return false;
1904 }
1905
1906 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
1907 return false;
1908 }
1909
1910 return true;
1911 }
1912
1913 if (strcmp(name, _jdwp) == 0) {
1914 return true;
1915 }
1916
1917 return false;
1918 }
1919 #endif
1920
1921 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
1922 // --patch-module=<module>=<file>(<pathsep><file>)*
1923 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
1924 // Find the equal sign between the module name and the path specification
1925 const char* module_equal = strchr(patch_mod_tail, '=');
1926 if (module_equal == nullptr) {
1927 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
1928 return JNI_ERR;
1929 } else {
1930 // Pick out the module name
1931 size_t module_len = module_equal - patch_mod_tail;
1932 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
1933 if (module_name != nullptr) {
1934 memcpy(module_name, patch_mod_tail, module_len);
1935 *(module_name + module_len) = '\0';
1936 // The path piece begins one past the module_equal sign
1937 add_patch_mod_prefix(module_name, module_equal + 1);
1938 FREE_C_HEAP_ARRAY(module_name);
1939 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
1940 return JNI_ENOMEM;
1941 }
1942 } else {
1943 return JNI_ENOMEM;
1944 }
1945 }
1946 return JNI_OK;
1947 }
1948
1949 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
1950 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
1951 // The min and max sizes match the values in globals.hpp, but scaled
1952 // with K. The values have been chosen so that alignment with page
1953 // size doesn't change the max value, which makes the conversions
1954 // back and forth between Xss value and ThreadStackSize value easier.
1955 // The values have also been chosen to fit inside a 32-bit signed type.
1956 const julong min_ThreadStackSize = 0;
1957 const julong max_ThreadStackSize = 1 * M;
1958
1959 // Make sure the above values match the range set in globals.hpp
1960 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
1961 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
1962 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
1963
1964 const julong min_size = min_ThreadStackSize * K;
1965 const julong max_size = max_ThreadStackSize * K;
1966
1967 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
1968
1969 julong size = 0;
1970 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
1971 if (errcode != arg_in_range) {
1972 bool silent = (option == nullptr); // Allow testing to silence error messages
1973 if (!silent) {
1974 jio_fprintf(defaultStream::error_stream(),
1975 "Invalid thread stack size: %s\n", option->optionString);
1976 describe_range_error(errcode);
1977 }
1978 return JNI_EINVAL;
1979 }
1980
1981 // Internally track ThreadStackSize in units of 1024 bytes.
1982 const julong size_aligned = align_up(size, K);
1983 assert(size <= size_aligned,
1984 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
1985 size, size_aligned);
1986
1987 const julong size_in_K = size_aligned / K;
1988 assert(size_in_K < (julong)max_intx,
1989 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
1990 size_in_K);
1991
1992 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
1993 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
1994 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
1995 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
1996 max_expanded, size_in_K);
1997
1998 *out_ThreadStackSize = (intx)size_in_K;
1999
2000 return JNI_OK;
2001 }
2002
2003 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2004 // For match_option to return remaining or value part of option string
2005 const char* tail;
2006
2007 // iterate over arguments
2008 for (int index = 0; index < args->nOptions; index++) {
2009 bool is_absolute_path = false; // for -agentpath vs -agentlib
2010
2011 const JavaVMOption* option = args->options + index;
2012
2013 if (!match_option(option, "-Djava.class.path", &tail) &&
2014 !match_option(option, "-Dsun.java.command", &tail) &&
2015 !match_option(option, "-Dsun.java.launcher", &tail)) {
2016
2017 // add all jvm options to the jvm_args string. This string
2018 // is used later to set the java.vm.args PerfData string constant.
2019 // the -Djava.class.path and the -Dsun.java.command options are
2020 // omitted from jvm_args string as each have their own PerfData
2021 // string constant object.
2022 build_jvm_args(option->optionString);
2023 }
2024
2025 // -verbose:[class/module/gc/jni]
2026 if (match_option(option, "-verbose", &tail)) {
2027 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2028 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2029 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2030 } else if (!strcmp(tail, ":module")) {
2031 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2032 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2033 } else if (!strcmp(tail, ":gc")) {
2034 if (_legacyGCLogging.lastFlag == 0) {
2035 _legacyGCLogging.lastFlag = 1;
2036 }
2037 } else if (!strcmp(tail, ":jni")) {
2038 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2039 }
2040 // -da / -ea / -disableassertions / -enableassertions
2041 // These accept an optional class/package name separated by a colon, e.g.,
2042 // -da:java.lang.Thread.
2043 } else if (match_option(option, user_assertion_options, &tail, true)) {
2044 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2045 if (*tail == '\0') {
2046 JavaAssertions::setUserClassDefault(enable);
2047 } else {
2048 assert(*tail == ':', "bogus match by match_option()");
2049 JavaAssertions::addOption(tail + 1, enable);
2050 }
2051 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2052 } else if (match_option(option, system_assertion_options, &tail, false)) {
2053 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2054 JavaAssertions::setSystemClassDefault(enable);
2055 // -bootclasspath:
2056 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2057 jio_fprintf(defaultStream::output_stream(),
2058 "-Xbootclasspath is no longer a supported option.\n");
2059 return JNI_EINVAL;
2060 // -bootclasspath/a:
2061 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2062 Arguments::append_sysclasspath(tail);
2063 // -bootclasspath/p:
2064 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2065 jio_fprintf(defaultStream::output_stream(),
2066 "-Xbootclasspath/p is no longer a supported option.\n");
2067 return JNI_EINVAL;
2068 // -Xrun
2069 } else if (match_option(option, "-Xrun", &tail)) {
2070 if (tail != nullptr) {
2071 const char* pos = strchr(tail, ':');
2072 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2073 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2074 jio_snprintf(name, len + 1, "%s", tail);
2075
2076 char *options = nullptr;
2077 if(pos != nullptr) {
2078 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2079 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2080 }
2081 #if !INCLUDE_JVMTI
2082 if (strcmp(name, "jdwp") == 0) {
2083 jio_fprintf(defaultStream::error_stream(),
2084 "Debugging agents are not supported in this VM\n");
2085 return JNI_ERR;
2086 }
2087 #endif // !INCLUDE_JVMTI
2088 JvmtiAgentList::add_xrun(name, options, false);
2089 FREE_C_HEAP_ARRAY(name);
2090 FREE_C_HEAP_ARRAY(options);
2091 }
2092 } else if (match_option(option, "--add-reads=", &tail)) {
2093 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2094 return JNI_ENOMEM;
2095 }
2096 } else if (match_option(option, "--add-exports=", &tail)) {
2097 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2098 return JNI_ENOMEM;
2099 }
2100 } else if (match_option(option, "--add-opens=", &tail)) {
2101 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2102 return JNI_ENOMEM;
2103 }
2104 } else if (match_option(option, "--add-modules=", &tail)) {
2105 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2106 return JNI_ENOMEM;
2107 }
2108 #if INCLUDE_JVMCI
2109 if (!_jvmci_module_added) {
2110 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2111 if (jvmci_module != nullptr) {
2112 char before = *(jvmci_module - 1);
2113 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2114 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2115 FLAG_SET_DEFAULT(EnableJVMCI, true);
2116 _jvmci_module_added = true;
2117 }
2118 }
2119 }
2120 #endif
2121 } else if (match_option(option, "--enable-native-access=", &tail)) {
2122 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2123 return JNI_ENOMEM;
2124 }
2125 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2126 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2127 return JNI_ENOMEM;
2128 }
2129 } else if (match_option(option, "--limit-modules=", &tail)) {
2130 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2131 return JNI_ENOMEM;
2132 }
2133 } else if (match_option(option, "--module-path=", &tail)) {
2134 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2135 return JNI_ENOMEM;
2136 }
2137 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2138 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2139 return JNI_ENOMEM;
2140 }
2141 } else if (match_option(option, "--patch-module=", &tail)) {
2142 // --patch-module=<module>=<file>(<pathsep><file>)*
2143 int res = process_patch_mod_option(tail);
2144 if (res != JNI_OK) {
2145 return res;
2146 }
2147 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2148 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2149 return JNI_ENOMEM;
2150 }
2151 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2152 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2153 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2154 AddProperty, WriteableProperty, InternalProperty);
2155 } else {
2156 jio_fprintf(defaultStream::error_stream(),
2157 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2158 return JNI_ERR;
2159 }
2160 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2161 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2162 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2163 AddProperty, WriteableProperty, InternalProperty);
2164 } else {
2165 jio_fprintf(defaultStream::error_stream(),
2166 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2167 return JNI_ERR;
2168 }
2169 } else if (match_option(option, "--illegal-access=", &tail)) {
2170 char version[256];
2171 JDK_Version::jdk(17).to_string(version, sizeof(version));
2172 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2173 // -agentlib and -agentpath
2174 } else if (match_option(option, "-agentlib:", &tail) ||
2175 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2176 if(tail != nullptr) {
2177 const char* pos = strchr(tail, '=');
2178 char* name;
2179 if (pos == nullptr) {
2180 name = os::strdup_check_oom(tail, mtArguments);
2181 } else {
2182 size_t len = pos - tail;
2183 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2184 memcpy(name, tail, len);
2185 name[len] = '\0';
2186 }
2187
2188 char *options = nullptr;
2189 if(pos != nullptr) {
2190 options = os::strdup_check_oom(pos + 1, mtArguments);
2191 }
2192 #if !INCLUDE_JVMTI
2193 if (valid_jdwp_agent(name, is_absolute_path)) {
2194 jio_fprintf(defaultStream::error_stream(),
2195 "Debugging agents are not supported in this VM\n");
2196 return JNI_ERR;
2197 }
2198 #elif INCLUDE_CDS
2199 if (valid_jdwp_agent(name, is_absolute_path)) {
2200 _has_jdwp_agent = true;
2201 }
2202 #endif // !INCLUDE_JVMTI
2203 JvmtiAgentList::add(name, options, is_absolute_path);
2204 os::free(name);
2205 os::free(options);
2206 }
2207 // -javaagent
2208 } else if (match_option(option, "-javaagent:", &tail)) {
2209 #if !INCLUDE_JVMTI
2210 jio_fprintf(defaultStream::error_stream(),
2211 "Instrumentation agents are not supported in this VM\n");
2212 return JNI_ERR;
2213 #else
2214 if (tail != nullptr) {
2215 size_t length = strlen(tail) + 1;
2216 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2217 jio_snprintf(options, length, "%s", tail);
2218 JvmtiAgentList::add("instrument", options, false);
2219 FREE_C_HEAP_ARRAY(options);
2220
2221 // java agents need module java.instrument
2222 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2223 return JNI_ENOMEM;
2224 }
2225 }
2226 #endif // !INCLUDE_JVMTI
2227 // --enable_preview
2228 } else if (match_option(option, "--enable-preview")) {
2229 set_enable_preview();
2230 // -Xnoclassgc
2231 } else if (match_option(option, "-Xnoclassgc")) {
2232 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2233 return JNI_EINVAL;
2234 }
2235 // -Xbatch
2236 } else if (match_option(option, "-Xbatch")) {
2237 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2238 return JNI_EINVAL;
2239 }
2240 // -Xmn for compatibility with other JVM vendors
2241 } else if (match_option(option, "-Xmn", &tail)) {
2242 julong long_initial_young_size = 0;
2243 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2244 if (errcode != arg_in_range) {
2245 jio_fprintf(defaultStream::error_stream(),
2246 "Invalid initial young generation size: %s\n", option->optionString);
2247 describe_range_error(errcode);
2248 return JNI_EINVAL;
2249 }
2250 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2251 return JNI_EINVAL;
2252 }
2253 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2254 return JNI_EINVAL;
2255 }
2256 // -Xms
2257 } else if (match_option(option, "-Xms", &tail)) {
2258 julong size = 0;
2259 // an initial heap size of 0 means automatically determine
2260 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2261 if (errcode != arg_in_range) {
2262 jio_fprintf(defaultStream::error_stream(),
2263 "Invalid initial heap size: %s\n", option->optionString);
2264 describe_range_error(errcode);
2265 return JNI_EINVAL;
2266 }
2267 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2268 return JNI_EINVAL;
2269 }
2270 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2271 return JNI_EINVAL;
2272 }
2273 // -Xmx
2274 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2275 julong long_max_heap_size = 0;
2276 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2277 if (errcode != arg_in_range) {
2278 jio_fprintf(defaultStream::error_stream(),
2279 "Invalid maximum heap size: %s\n", option->optionString);
2280 describe_range_error(errcode);
2281 return JNI_EINVAL;
2282 }
2283 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2284 return JNI_EINVAL;
2285 }
2286 // Xmaxf
2287 } else if (match_option(option, "-Xmaxf", &tail)) {
2288 char* err;
2289 double dmaxf = strtod(tail, &err);
2290 if (*err != '\0' || *tail == '\0') {
2291 jio_fprintf(defaultStream::error_stream(),
2292 "Bad max heap free ratio: %s\n",
2293 option->optionString);
2294 return JNI_EINVAL;
2295 }
2296 if (dmaxf < 0.0 || dmaxf > 1.0) {
2297 jio_fprintf(defaultStream::error_stream(),
2298 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2299 option->optionString);
2300 return JNI_EINVAL;
2301 }
2302 const uintx umaxf = (uintx)(dmaxf * 100);
2303 if (MinHeapFreeRatio > umaxf) {
2304 jio_fprintf(defaultStream::error_stream(),
2305 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2306 tail, MinHeapFreeRatio / 100.0f);
2307 return JNI_EINVAL;
2308 }
2309 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2310 return JNI_EINVAL;
2311 }
2312 // Xminf
2313 } else if (match_option(option, "-Xminf", &tail)) {
2314 char* err;
2315 double dminf = strtod(tail, &err);
2316 if (*err != '\0' || *tail == '\0') {
2317 jio_fprintf(defaultStream::error_stream(),
2318 "Bad min heap free ratio: %s\n",
2319 option->optionString);
2320 return JNI_EINVAL;
2321 }
2322 if (dminf < 0.0 || dminf > 1.0) {
2323 jio_fprintf(defaultStream::error_stream(),
2324 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2325 tail);
2326 return JNI_EINVAL;
2327 }
2328 const uintx uminf = (uintx)(dminf * 100);
2329 if (MaxHeapFreeRatio < uminf) {
2330 jio_fprintf(defaultStream::error_stream(),
2331 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2332 tail, MaxHeapFreeRatio / 100.0f);
2333 return JNI_EINVAL;
2334 }
2335 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2336 return JNI_EINVAL;
2337 }
2338 // -Xss
2339 } else if (match_option(option, "-Xss", &tail)) {
2340 intx value = 0;
2341 jint err = parse_xss(option, tail, &value);
2342 if (err != JNI_OK) {
2343 return err;
2344 }
2345 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2346 return JNI_EINVAL;
2347 }
2348 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2349 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2350 if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2351 warning("Option -Xmaxjitcodesize was deprecated in JDK 26 and will likely be removed in a future release.");
2352 }
2353 julong long_ReservedCodeCacheSize = 0;
2354
2355 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2356 if (errcode != arg_in_range) {
2357 jio_fprintf(defaultStream::error_stream(),
2358 "Invalid maximum code cache size: %s.\n", option->optionString);
2359 return JNI_EINVAL;
2360 }
2361 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2362 return JNI_EINVAL;
2363 }
2364 // -green
2365 } else if (match_option(option, "-green")) {
2366 jio_fprintf(defaultStream::error_stream(),
2367 "Green threads support not available\n");
2368 return JNI_EINVAL;
2369 // -native
2370 } else if (match_option(option, "-native")) {
2371 // HotSpot always uses native threads, ignore silently for compatibility
2372 // -Xrs
2373 } else if (match_option(option, "-Xrs")) {
2374 // Classic/EVM option, new functionality
2375 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2376 return JNI_EINVAL;
2377 }
2378 // -Xprof
2379 } else if (match_option(option, "-Xprof")) {
2380 char version[256];
2381 // Obsolete in JDK 10
2382 JDK_Version::jdk(10).to_string(version, sizeof(version));
2383 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2384 // -Xinternalversion
2385 } else if (match_option(option, "-Xinternalversion")) {
2386 jio_fprintf(defaultStream::output_stream(), "%s\n",
2387 VM_Version::internal_vm_info_string());
2388 vm_exit(0);
2389 #ifndef PRODUCT
2390 // -Xprintflags
2391 } else if (match_option(option, "-Xprintflags")) {
2392 JVMFlag::printFlags(tty, false);
2393 vm_exit(0);
2394 #endif
2395 // -D
2396 } else if (match_option(option, "-D", &tail)) {
2397 const char* value;
2398 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2399 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2400 // abort if -Djava.endorsed.dirs is set
2401 jio_fprintf(defaultStream::output_stream(),
2402 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2403 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2404 return JNI_EINVAL;
2405 }
2406 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2407 *value != '\0' && strcmp(value, "\"\"") != 0) {
2408 // abort if -Djava.ext.dirs is set
2409 jio_fprintf(defaultStream::output_stream(),
2410 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2411 return JNI_EINVAL;
2412 }
2413 // Check for module related properties. They must be set using the modules
2414 // options. For example: use "--add-modules=java.sql", not
2415 // "-Djdk.module.addmods=java.sql"
2416 if (is_internal_module_property(option->optionString + 2)) {
2417 needs_module_property_warning = true;
2418 continue;
2419 }
2420 if (!add_property(tail)) {
2421 return JNI_ENOMEM;
2422 }
2423 // Out of the box management support
2424 if (match_option(option, "-Dcom.sun.management", &tail)) {
2425 #if INCLUDE_MANAGEMENT
2426 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2427 return JNI_EINVAL;
2428 }
2429 // management agent in module jdk.management.agent
2430 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2431 return JNI_ENOMEM;
2432 }
2433 #else
2434 jio_fprintf(defaultStream::output_stream(),
2435 "-Dcom.sun.management is not supported in this VM.\n");
2436 return JNI_ERR;
2437 #endif
2438 }
2439 // -Xint
2440 } else if (match_option(option, "-Xint")) {
2441 set_mode_flags(_int);
2442 mode_flag_cmd_line = true;
2443 // -Xmixed
2444 } else if (match_option(option, "-Xmixed")) {
2445 set_mode_flags(_mixed);
2446 mode_flag_cmd_line = true;
2447 // -Xcomp
2448 } else if (match_option(option, "-Xcomp")) {
2449 // for testing the compiler; turn off all flags that inhibit compilation
2450 set_mode_flags(_comp);
2451 mode_flag_cmd_line = true;
2452 // -Xshare:dump
2453 } else if (match_option(option, "-Xshare:dump")) {
2454 CDSConfig::enable_dumping_static_archive();
2455 CDSConfig::set_old_cds_flags_used();
2456 // -Xshare:on
2457 } else if (match_option(option, "-Xshare:on")) {
2458 UseSharedSpaces = true;
2459 RequireSharedSpaces = true;
2460 CDSConfig::set_old_cds_flags_used();
2461 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2462 } else if (match_option(option, "-Xshare:auto")) {
2463 UseSharedSpaces = true;
2464 RequireSharedSpaces = false;
2465 xshare_auto_cmd_line = true;
2466 CDSConfig::set_old_cds_flags_used();
2467 // -Xshare:off
2468 } else if (match_option(option, "-Xshare:off")) {
2469 UseSharedSpaces = false;
2470 RequireSharedSpaces = false;
2471 CDSConfig::set_old_cds_flags_used();
2472 // -Xverify
2473 } else if (match_option(option, "-Xverify", &tail)) {
2474 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2475 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2476 return JNI_EINVAL;
2477 }
2478 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2479 return JNI_EINVAL;
2480 }
2481 } else if (strcmp(tail, ":remote") == 0) {
2482 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2483 return JNI_EINVAL;
2484 }
2485 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2486 return JNI_EINVAL;
2487 }
2488 } else if (strcmp(tail, ":none") == 0) {
2489 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2490 return JNI_EINVAL;
2491 }
2492 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2493 return JNI_EINVAL;
2494 }
2495 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2496 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2497 return JNI_EINVAL;
2498 }
2499 // -Xdebug
2500 } else if (match_option(option, "-Xdebug")) {
2501 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2502 } else if (match_option(option, "-Xloggc:", &tail)) {
2503 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2504 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2505 _legacyGCLogging.lastFlag = 2;
2506 _legacyGCLogging.file = os::strdup_check_oom(tail);
2507 } else if (match_option(option, "-Xlog", &tail)) {
2508 bool ret = false;
2509 if (strcmp(tail, ":help") == 0) {
2510 fileStream stream(defaultStream::output_stream());
2511 LogConfiguration::print_command_line_help(&stream);
2512 vm_exit(0);
2513 } else if (strcmp(tail, ":disable") == 0) {
2514 LogConfiguration::disable_logging();
2515 ret = true;
2516 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2517 const char* async_tail = tail + strlen(":async");
2518 ret = LogConfiguration::parse_async_argument(async_tail);
2519 } else if (*tail == '\0') {
2520 ret = LogConfiguration::parse_command_line_arguments();
2521 assert(ret, "-Xlog without arguments should never fail to parse");
2522 } else if (*tail == ':') {
2523 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2524 }
2525 if (ret == false) {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2528 tail);
2529 return JNI_EINVAL;
2530 }
2531 // JNI hooks
2532 } else if (match_option(option, "-Xcheck", &tail)) {
2533 if (!strcmp(tail, ":jni")) {
2534 #if !INCLUDE_JNI_CHECK
2535 warning("JNI CHECKING is not supported in this VM");
2536 #else
2537 CheckJNICalls = true;
2538 #endif // INCLUDE_JNI_CHECK
2539 } else if (is_bad_option(option, args->ignoreUnrecognized,
2540 "check")) {
2541 return JNI_EINVAL;
2542 }
2543 } else if (match_option(option, "vfprintf")) {
2544 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2545 } else if (match_option(option, "exit")) {
2546 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2547 } else if (match_option(option, "abort")) {
2548 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2549 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2550 // and the last option wins.
2551 } else if (match_option(option, "-XX:+NeverTenure")) {
2552 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2553 return JNI_EINVAL;
2554 }
2555 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2556 return JNI_EINVAL;
2557 }
2558 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2559 return JNI_EINVAL;
2560 }
2561 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2562 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2563 return JNI_EINVAL;
2564 }
2565 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2566 return JNI_EINVAL;
2567 }
2568 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2569 return JNI_EINVAL;
2570 }
2571 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2572 uint max_tenuring_thresh = 0;
2573 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2574 jio_fprintf(defaultStream::error_stream(),
2575 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2576 return JNI_EINVAL;
2577 }
2578
2579 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2580 return JNI_EINVAL;
2581 }
2582
2583 if (MaxTenuringThreshold == 0) {
2584 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2585 return JNI_EINVAL;
2586 }
2587 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2588 return JNI_EINVAL;
2589 }
2590 } else {
2591 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2592 return JNI_EINVAL;
2593 }
2594 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2595 return JNI_EINVAL;
2596 }
2597 }
2598 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2599 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2600 return JNI_EINVAL;
2601 }
2602 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2603 return JNI_EINVAL;
2604 }
2605 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2606 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2607 return JNI_EINVAL;
2608 }
2609 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2610 return JNI_EINVAL;
2611 }
2612 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2613 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2614 return JNI_EINVAL;
2615 }
2616 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2617 return JNI_EINVAL;
2618 }
2619 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2620 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2621 return JNI_EINVAL;
2622 }
2623 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2624 return JNI_EINVAL;
2625 }
2626 } else if (match_option(option, "--finalization=", &tail)) {
2627 if (strcmp(tail, "enabled") == 0) {
2628 InstanceKlass::set_finalization_enabled(true);
2629 } else if (strcmp(tail, "disabled") == 0) {
2630 InstanceKlass::set_finalization_enabled(false);
2631 } else {
2632 jio_fprintf(defaultStream::error_stream(),
2633 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2634 tail);
2635 return JNI_EINVAL;
2636 }
2637 #if !defined(DTRACE_ENABLED)
2638 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2639 jio_fprintf(defaultStream::error_stream(),
2640 "DTraceMethodProbes flag is not applicable for this configuration\n");
2641 return JNI_EINVAL;
2642 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2643 jio_fprintf(defaultStream::error_stream(),
2644 "DTraceAllocProbes flag is not applicable for this configuration\n");
2645 return JNI_EINVAL;
2646 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2647 jio_fprintf(defaultStream::error_stream(),
2648 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2649 return JNI_EINVAL;
2650 #endif // !defined(DTRACE_ENABLED)
2651 #ifdef ASSERT
2652 } else if (match_option(option, "-XX:+FullGCALot")) {
2653 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2654 return JNI_EINVAL;
2655 }
2656 #endif
2657 #if !INCLUDE_MANAGEMENT
2658 } else if (match_option(option, "-XX:+ManagementServer")) {
2659 jio_fprintf(defaultStream::error_stream(),
2660 "ManagementServer is not supported in this VM.\n");
2661 return JNI_ERR;
2662 #endif // INCLUDE_MANAGEMENT
2663 #if INCLUDE_JVMCI
2664 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2665 if (EnableJVMCIProduct) {
2666 jio_fprintf(defaultStream::error_stream(),
2667 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2668 return JNI_EINVAL;
2669 }
2670 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2671 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2672 if (use_graal_jit) {
2673 const char* jvmci_compiler = get_property("jvmci.Compiler");
2674 if (jvmci_compiler != nullptr) {
2675 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2676 jio_fprintf(defaultStream::error_stream(),
2677 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2678 return JNI_ERR;
2679 }
2680 } else if (!add_property("jvmci.Compiler=graal")) {
2681 return JNI_ENOMEM;
2682 }
2683 }
2684
2685 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2686 if (EnableJVMCIProduct) {
2687 continue;
2688 }
2689 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2690 // Allow this flag if it has been unlocked.
2691 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2692 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2693 jio_fprintf(defaultStream::error_stream(),
2694 "Unable to enable JVMCI in product mode\n");
2695 return JNI_ERR;
2696 }
2697 }
2698 // The flag was locked so process normally to report that error
2699 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2700 return JNI_EINVAL;
2701 }
2702 #endif // INCLUDE_JVMCI
2703 #if INCLUDE_JFR
2704 } else if (match_jfr_option(&option)) {
2705 return JNI_EINVAL;
2706 #endif
2707 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2708 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2709 // already been handled
2710 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2711 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2712 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2713 return JNI_EINVAL;
2714 }
2715 }
2716 // Unknown option
2717 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2718 return JNI_ERR;
2719 }
2720 }
2721
2722 // PrintSharedArchiveAndExit will turn on
2723 // -Xshare:on
2724 // -Xlog:class+path=info
2725 if (PrintSharedArchiveAndExit) {
2726 UseSharedSpaces = true;
2727 RequireSharedSpaces = true;
2728 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2729 }
2730
2731 fix_appclasspath();
2732
2733 return JNI_OK;
2734 }
2735
2736 void Arguments::set_ext_dirs(char *value) {
2737 _ext_dirs = os::strdup_check_oom(value);
2738 }
2739
2740 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2741 // For java.base check for duplicate --patch-module options being specified on the command line.
2742 // This check is only required for java.base, all other duplicate module specifications
2743 // will be checked during module system initialization. The module system initialization
2744 // will throw an ExceptionInInitializerError if this situation occurs.
2745 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2746 if (patch_mod_javabase) {
2747 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2748 } else {
2749 patch_mod_javabase = true;
2750 }
2751 }
2752
2753 // Create GrowableArray lazily, only if --patch-module has been specified
2754 if (_patch_mod_prefix == nullptr) {
2755 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2756 }
2757
2758 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2759 }
2760
2761 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2762 //
2763 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2764 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2765 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2766 // path is treated as the current directory.
2767 //
2768 // This causes problems with CDS, which requires that all directories specified in the classpath
2769 // must be empty. In most cases, applications do NOT want to load classes from the current
2770 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2771 // scripts compatible with CDS.
2772 void Arguments::fix_appclasspath() {
2773 if (IgnoreEmptyClassPaths) {
2774 const char separator = *os::path_separator();
2775 const char* src = _java_class_path->value();
2776
2777 // skip over all the leading empty paths
2778 while (*src == separator) {
2779 src ++;
2780 }
2781
2782 char* copy = os::strdup_check_oom(src, mtArguments);
2783
2784 // trim all trailing empty paths
2785 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2786 *tail = '\0';
2787 }
2788
2789 char from[3] = {separator, separator, '\0'};
2790 char to [2] = {separator, '\0'};
2791 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2792 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2793 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2794 }
2795
2796 _java_class_path->set_writeable_value(copy);
2797 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2798 }
2799 }
2800
2801 jint Arguments::finalize_vm_init_args() {
2802 // check if the default lib/endorsed directory exists; if so, error
2803 char path[JVM_MAXPATHLEN];
2804 const char* fileSep = os::file_separator();
2805 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2806
2807 DIR* dir = os::opendir(path);
2808 if (dir != nullptr) {
2809 jio_fprintf(defaultStream::output_stream(),
2810 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2811 "in modular form will be supported via the concept of upgradeable modules.\n");
2812 os::closedir(dir);
2813 return JNI_ERR;
2814 }
2815
2816 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2817 dir = os::opendir(path);
2818 if (dir != nullptr) {
2819 jio_fprintf(defaultStream::output_stream(),
2820 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2821 "Use -classpath instead.\n.");
2822 os::closedir(dir);
2823 return JNI_ERR;
2824 }
2825
2826 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2827 // but like -Xint, leave compilation thresholds unaffected.
2828 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2829 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2830 set_mode_flags(_int);
2831 }
2832
2833 #ifdef ZERO
2834 // Zero always runs in interpreted mode
2835 set_mode_flags(_int);
2836 #endif
2837
2838 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2839 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2840 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2841 }
2842
2843 #if !COMPILER2_OR_JVMCI
2844 // Don't degrade server performance for footprint
2845 if (FLAG_IS_DEFAULT(UseLargePages) &&
2846 MaxHeapSize < LargePageHeapSizeThreshold) {
2847 // No need for large granularity pages w/small heaps.
2848 // Note that large pages are enabled/disabled for both the
2849 // Java heap and the code cache.
2850 FLAG_SET_DEFAULT(UseLargePages, false);
2851 }
2852
2853 UNSUPPORTED_OPTION(ProfileInterpreter);
2854 #endif
2855
2856 // Parse the CompilationMode flag
2857 if (!CompilationModeFlag::initialize()) {
2858 return JNI_ERR;
2859 }
2860
2861 if (!check_vm_args_consistency()) {
2862 return JNI_ERR;
2863 }
2864
2865
2866 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2867 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2868 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2869
2870 return JNI_OK;
2871 }
2872
2873 // Helper class for controlling the lifetime of JavaVMInitArgs
2874 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2875 // deleted on the destruction of the ScopedVMInitArgs object.
2876 class ScopedVMInitArgs : public StackObj {
2877 private:
2878 JavaVMInitArgs _args;
2879 char* _container_name;
2880 bool _is_set;
2881 char* _vm_options_file_arg;
2882
2883 public:
2884 ScopedVMInitArgs(const char *container_name) {
2885 _args.version = JNI_VERSION_1_2;
2886 _args.nOptions = 0;
2887 _args.options = nullptr;
2888 _args.ignoreUnrecognized = false;
2889 _container_name = (char *)container_name;
2890 _is_set = false;
2891 _vm_options_file_arg = nullptr;
2892 }
2893
2894 // Populates the JavaVMInitArgs object represented by this
2895 // ScopedVMInitArgs object with the arguments in options. The
2896 // allocated memory is deleted by the destructor. If this method
2897 // returns anything other than JNI_OK, then this object is in a
2898 // partially constructed state, and should be abandoned.
2899 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2900 _is_set = true;
2901 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2902 JavaVMOption, options->length(), mtArguments);
2903 if (options_arr == nullptr) {
2904 return JNI_ENOMEM;
2905 }
2906 _args.options = options_arr;
2907
2908 for (int i = 0; i < options->length(); i++) {
2909 options_arr[i] = options->at(i);
2910 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2911 if (options_arr[i].optionString == nullptr) {
2912 // Rely on the destructor to do cleanup.
2913 _args.nOptions = i;
2914 return JNI_ENOMEM;
2915 }
2916 }
2917
2918 _args.nOptions = options->length();
2919 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2920 return JNI_OK;
2921 }
2922
2923 JavaVMInitArgs* get() { return &_args; }
2924 char* container_name() { return _container_name; }
2925 bool is_set() { return _is_set; }
2926 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
2927 char* vm_options_file_arg() { return _vm_options_file_arg; }
2928
2929 void set_vm_options_file_arg(const char *vm_options_file_arg) {
2930 if (_vm_options_file_arg != nullptr) {
2931 os::free(_vm_options_file_arg);
2932 }
2933 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
2934 }
2935
2936 ~ScopedVMInitArgs() {
2937 if (_vm_options_file_arg != nullptr) {
2938 os::free(_vm_options_file_arg);
2939 }
2940 if (_args.options == nullptr) return;
2941 for (int i = 0; i < _args.nOptions; i++) {
2942 os::free(_args.options[i].optionString);
2943 }
2944 FREE_C_HEAP_ARRAY(_args.options);
2945 }
2946
2947 // Insert options into this option list, to replace option at
2948 // vm_options_file_pos (-XX:VMOptionsFile)
2949 jint insert(const JavaVMInitArgs* args,
2950 const JavaVMInitArgs* args_to_insert,
2951 const int vm_options_file_pos) {
2952 assert(_args.options == nullptr, "shouldn't be set yet");
2953 assert(args_to_insert->nOptions != 0, "there should be args to insert");
2954 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
2955
2956 int length = args->nOptions + args_to_insert->nOptions - 1;
2957 // Construct new option array
2958 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
2959 for (int i = 0; i < args->nOptions; i++) {
2960 if (i == vm_options_file_pos) {
2961 // insert the new options starting at the same place as the
2962 // -XX:VMOptionsFile option
2963 for (int j = 0; j < args_to_insert->nOptions; j++) {
2964 options.push(args_to_insert->options[j]);
2965 }
2966 } else {
2967 options.push(args->options[i]);
2968 }
2969 }
2970 // make into options array
2971 return set_args(&options);
2972 }
2973 };
2974
2975 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
2976 return parse_options_environment_variable("_JAVA_OPTIONS", args);
2977 }
2978
2979 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
2980 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
2981 }
2982
2983 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
2984 for (int index = args->nOptions - 1; index >= 0; index--) {
2985 JavaVMOption* option = args->options + index;
2986 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
2987 return option;
2988 }
2989 }
2990
2991 return nullptr;
2992 }
2993
2994 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
2995 ScopedVMInitArgs* jdk_aot_vm_options_args) {
2996 // Don't bother scanning all the args if this env variable is not set
2997 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
2998 return JNI_OK;
2999 }
3000
3001 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3002 // of AOTMode.
3003 JavaVMOption* option = nullptr;
3004 for (int i = all_args->length() - 1; i >= 0; i--) {
3005 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3006 break;
3007 }
3008 }
3009
3010 if (option != nullptr) {
3011 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3012 // so its value is not reflected inside the global variable AOTMode.
3013 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3014 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3015 }
3016 } else {
3017 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3018 // which would have been set inside process_settings_file();
3019 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3020 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3021 }
3022 }
3023
3024 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3025 }
3026
3027 jint Arguments::parse_options_environment_variable(const char* name,
3028 ScopedVMInitArgs* vm_args) {
3029 char *buffer = ::getenv(name);
3030
3031 // Don't check this environment variable if user has special privileges
3032 // (e.g. unix su command).
3033 if (buffer == nullptr || os::have_special_privileges()) {
3034 return JNI_OK;
3035 }
3036
3037 if ((buffer = os::strdup(buffer)) == nullptr) {
3038 return JNI_ENOMEM;
3039 }
3040
3041 jio_fprintf(defaultStream::error_stream(),
3042 "Picked up %s: %s\n", name, buffer);
3043
3044 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3045
3046 os::free(buffer);
3047 return retcode;
3048 }
3049
3050 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3051 // read file into buffer
3052 int fd = ::open(file_name, O_RDONLY);
3053 if (fd < 0) {
3054 jio_fprintf(defaultStream::error_stream(),
3055 "Could not open options file '%s'\n",
3056 file_name);
3057 return JNI_ERR;
3058 }
3059
3060 struct stat stbuf;
3061 int retcode = os::stat(file_name, &stbuf);
3062 if (retcode != 0) {
3063 jio_fprintf(defaultStream::error_stream(),
3064 "Could not stat options file '%s'\n",
3065 file_name);
3066 ::close(fd);
3067 return JNI_ERR;
3068 }
3069
3070 if (stbuf.st_size == 0) {
3071 // tell caller there is no option data and that is ok
3072 ::close(fd);
3073 return JNI_OK;
3074 }
3075
3076 // '+ 1' for null termination even with max bytes
3077 size_t bytes_alloc = stbuf.st_size + 1;
3078
3079 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3080 if (nullptr == buf) {
3081 jio_fprintf(defaultStream::error_stream(),
3082 "Could not allocate read buffer for options file parse\n");
3083 ::close(fd);
3084 return JNI_ENOMEM;
3085 }
3086
3087 memset(buf, 0, bytes_alloc);
3088
3089 // Fill buffer
3090 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3091 ::close(fd);
3092 if (bytes_read < 0) {
3093 FREE_C_HEAP_ARRAY(buf);
3094 jio_fprintf(defaultStream::error_stream(),
3095 "Could not read options file '%s'\n", file_name);
3096 return JNI_ERR;
3097 }
3098
3099 if (bytes_read == 0) {
3100 // tell caller there is no option data and that is ok
3101 FREE_C_HEAP_ARRAY(buf);
3102 return JNI_OK;
3103 }
3104
3105 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3106
3107 FREE_C_HEAP_ARRAY(buf);
3108 return retcode;
3109 }
3110
3111 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3112 // Construct option array
3113 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3114
3115 // some pointers to help with parsing
3116 char *buffer_end = buffer + buf_len;
3117 char *opt_hd = buffer;
3118 char *wrt = buffer;
3119 char *rd = buffer;
3120
3121 // parse all options
3122 while (rd < buffer_end) {
3123 // skip leading white space from the input string
3124 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3125 rd++;
3126 }
3127
3128 if (rd >= buffer_end) {
3129 break;
3130 }
3131
3132 // Remember this is where we found the head of the token.
3133 opt_hd = wrt;
3134
3135 // Tokens are strings of non white space characters separated
3136 // by one or more white spaces.
3137 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3138 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3139 int quote = *rd; // matching quote to look for
3140 rd++; // don't copy open quote
3141 while (rd < buffer_end && *rd != quote) {
3142 // include everything (even spaces)
3143 // up until the close quote
3144 *wrt++ = *rd++; // copy to option string
3145 }
3146
3147 if (rd < buffer_end) {
3148 rd++; // don't copy close quote
3149 } else {
3150 // did not see closing quote
3151 jio_fprintf(defaultStream::error_stream(),
3152 "Unmatched quote in %s\n", name);
3153 return JNI_ERR;
3154 }
3155 } else {
3156 *wrt++ = *rd++; // copy to option string
3157 }
3158 }
3159
3160 // steal a white space character and set it to null
3161 *wrt++ = '\0';
3162 // We now have a complete token
3163
3164 JavaVMOption option;
3165 option.optionString = opt_hd;
3166 option.extraInfo = nullptr;
3167
3168 options.append(option); // Fill in option
3169
3170 rd++; // Advance to next character
3171 }
3172
3173 // Fill out JavaVMInitArgs structure.
3174 return vm_args->set_args(&options);
3175 }
3176
3177 #ifndef PRODUCT
3178 // Determine whether LogVMOutput should be implicitly turned on.
3179 static bool use_vm_log() {
3180 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3181 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3182 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3183 PrintAssembly || TraceDeoptimization ||
3184 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3185 return true;
3186 }
3187
3188 #ifdef COMPILER1
3189 if (PrintC1Statistics) {
3190 return true;
3191 }
3192 #endif // COMPILER1
3193
3194 #ifdef COMPILER2
3195 if (PrintOptoAssembly || PrintOptoStatistics) {
3196 return true;
3197 }
3198 #endif // COMPILER2
3199
3200 return false;
3201 }
3202
3203 #endif // PRODUCT
3204
3205 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3206 for (int index = 0; index < args->nOptions; index++) {
3207 const JavaVMOption* option = args->options + index;
3208 const char* tail;
3209 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3210 return true;
3211 }
3212 }
3213 return false;
3214 }
3215
3216 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3217 const char* vm_options_file,
3218 const int vm_options_file_pos,
3219 ScopedVMInitArgs* vm_options_file_args,
3220 ScopedVMInitArgs* args_out) {
3221 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3222 if (code != JNI_OK) {
3223 return code;
3224 }
3225
3226 if (vm_options_file_args->get()->nOptions < 1) {
3227 return JNI_OK;
3228 }
3229
3230 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3231 jio_fprintf(defaultStream::error_stream(),
3232 "A VM options file may not refer to a VM options file. "
3233 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3234 "options file '%s' in options container '%s' is an error.\n",
3235 vm_options_file_args->vm_options_file_arg(),
3236 vm_options_file_args->container_name());
3237 return JNI_EINVAL;
3238 }
3239
3240 return args_out->insert(args, vm_options_file_args->get(),
3241 vm_options_file_pos);
3242 }
3243
3244 // Expand -XX:VMOptionsFile found in args_in as needed.
3245 // mod_args and args_out parameters may return values as needed.
3246 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3247 ScopedVMInitArgs* mod_args,
3248 JavaVMInitArgs** args_out) {
3249 jint code = match_special_option_and_act(args_in, mod_args);
3250 if (code != JNI_OK) {
3251 return code;
3252 }
3253
3254 if (mod_args->is_set()) {
3255 // args_in contains -XX:VMOptionsFile and mod_args contains the
3256 // original options from args_in along with the options expanded
3257 // from the VMOptionsFile. Return a short-hand to the caller.
3258 *args_out = mod_args->get();
3259 } else {
3260 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3261 }
3262 return JNI_OK;
3263 }
3264
3265 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3266 ScopedVMInitArgs* args_out) {
3267 // Remaining part of option string
3268 const char* tail;
3269 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3270
3271 for (int index = 0; index < args->nOptions; index++) {
3272 const JavaVMOption* option = args->options + index;
3273 if (match_option(option, "-XX:Flags=", &tail)) {
3274 Arguments::set_jvm_flags_file(tail);
3275 continue;
3276 }
3277 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3278 if (vm_options_file_args.found_vm_options_file_arg()) {
3279 jio_fprintf(defaultStream::error_stream(),
3280 "The option '%s' is already specified in the options "
3281 "container '%s' so the specification of '%s' in the "
3282 "same options container is an error.\n",
3283 vm_options_file_args.vm_options_file_arg(),
3284 vm_options_file_args.container_name(),
3285 option->optionString);
3286 return JNI_EINVAL;
3287 }
3288 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3289 // If there's a VMOptionsFile, parse that
3290 jint code = insert_vm_options_file(args, tail, index,
3291 &vm_options_file_args, args_out);
3292 if (code != JNI_OK) {
3293 return code;
3294 }
3295 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3296 if (args_out->is_set()) {
3297 // The VMOptions file inserted some options so switch 'args'
3298 // to the new set of options, and continue processing which
3299 // preserves "last option wins" semantics.
3300 args = args_out->get();
3301 // The first option from the VMOptionsFile replaces the
3302 // current option. So we back track to process the
3303 // replacement option.
3304 index--;
3305 }
3306 continue;
3307 }
3308 if (match_option(option, "-XX:+PrintVMOptions")) {
3309 PrintVMOptions = true;
3310 continue;
3311 }
3312 if (match_option(option, "-XX:-PrintVMOptions")) {
3313 PrintVMOptions = false;
3314 continue;
3315 }
3316 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3317 IgnoreUnrecognizedVMOptions = true;
3318 continue;
3319 }
3320 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3321 IgnoreUnrecognizedVMOptions = false;
3322 continue;
3323 }
3324 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3325 JVMFlag::printFlags(tty, false);
3326 vm_exit(0);
3327 }
3328
3329 #ifndef PRODUCT
3330 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3331 JVMFlag::printFlags(tty, true);
3332 vm_exit(0);
3333 }
3334 #endif
3335 }
3336 return JNI_OK;
3337 }
3338
3339 static void print_options(const JavaVMInitArgs *args) {
3340 const char* tail;
3341 for (int index = 0; index < args->nOptions; index++) {
3342 const JavaVMOption *option = args->options + index;
3343 if (match_option(option, "-XX:", &tail)) {
3344 logOption(tail);
3345 }
3346 }
3347 }
3348
3349 bool Arguments::handle_deprecated_print_gc_flags() {
3350 if (PrintGC) {
3351 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3352 }
3353 if (PrintGCDetails) {
3354 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3355 }
3356
3357 if (_legacyGCLogging.lastFlag == 2) {
3358 // -Xloggc was used to specify a filename
3359 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3360
3361 LogTarget(Error, logging) target;
3362 LogStream errstream(target);
3363 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3364 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3365 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3366 }
3367 return true;
3368 }
3369
3370 static void apply_debugger_ergo() {
3371 #ifdef ASSERT
3372 if (ReplayCompiles) {
3373 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3374 }
3375
3376 if (UseDebuggerErgo) {
3377 // Turn on sub-flags
3378 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3379 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3380 }
3381
3382 if (UseDebuggerErgo2) {
3383 // Debugging with limited number of CPUs
3384 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3385 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3386 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3387 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3388 }
3389 #endif // ASSERT
3390 }
3391
3392 // Parse entry point called from JNI_CreateJavaVM
3393
3394 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3395 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3396 JVMFlag::check_all_flag_declarations();
3397
3398 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3399 const char* hotspotrc = ".hotspotrc";
3400 bool settings_file_specified = false;
3401 bool needs_hotspotrc_warning = false;
3402 ScopedVMInitArgs initial_vm_options_args("");
3403 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3404 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3405 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3406
3407 // Pointers to current working set of containers
3408 JavaVMInitArgs* cur_cmd_args;
3409 JavaVMInitArgs* cur_vm_options_args;
3410 JavaVMInitArgs* cur_java_options_args;
3411 JavaVMInitArgs* cur_java_tool_options_args;
3412 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3413
3414 // Containers for modified/expanded options
3415 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3416 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3417 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3418 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3419 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3420
3421 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3422
3423 jint code =
3424 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3425 if (code != JNI_OK) {
3426 return code;
3427 }
3428
3429 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3430 // This is an undocumented feature.
3431 code = parse_java_options_environment_variable(&initial_java_options_args);
3432 if (code != JNI_OK) {
3433 return code;
3434 }
3435
3436 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3437 char *vmoptions = ClassLoader::lookup_vm_options();
3438 if (vmoptions != nullptr) {
3439 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3440 FREE_C_HEAP_ARRAY(vmoptions);
3441 if (code != JNI_OK) {
3442 return code;
3443 }
3444 }
3445
3446 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3447 &mod_java_tool_options_args,
3448 &cur_java_tool_options_args);
3449 if (code != JNI_OK) {
3450 return code;
3451 }
3452
3453 code = expand_vm_options_as_needed(initial_cmd_args,
3454 &mod_cmd_args,
3455 &cur_cmd_args);
3456 if (code != JNI_OK) {
3457 return code;
3458 }
3459
3460 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3461 &mod_java_options_args,
3462 &cur_java_options_args);
3463 if (code != JNI_OK) {
3464 return code;
3465 }
3466
3467 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3468 &mod_vm_options_args,
3469 &cur_vm_options_args);
3470 if (code != JNI_OK) {
3471 return code;
3472 }
3473
3474 const char* flags_file = Arguments::get_jvm_flags_file();
3475 settings_file_specified = (flags_file != nullptr);
3476
3477 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3478 if (settings_file_specified) {
3479 if (!process_settings_file(flags_file, true,
3480 IgnoreUnrecognizedVMOptions)) {
3481 return JNI_EINVAL;
3482 }
3483 } else {
3484 #ifdef ASSERT
3485 // Parse default .hotspotrc settings file
3486 if (!process_settings_file(".hotspotrc", false,
3487 IgnoreUnrecognizedVMOptions)) {
3488 return JNI_EINVAL;
3489 }
3490 #else
3491 struct stat buf;
3492 if (os::stat(hotspotrc, &buf) == 0) {
3493 needs_hotspotrc_warning = true;
3494 }
3495 #endif
3496 }
3497
3498 // The settings in the args are applied in this order to the the JVM global flags.
3499 // For historical reasons, the order is DIFFERENT than the scanning order of
3500 // the above expand_vm_options_as_needed() calls.
3501 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3502 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3503 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3504 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3505
3506 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3507 // the options that have been gathered above.
3508 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3509 if (code != JNI_OK) {
3510 return code;
3511 }
3512 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3513 &mod_jdk_aot_vm_options_args,
3514 &cur_jdk_aot_vm_options_args);
3515 if (code != JNI_OK) {
3516 return code;
3517 }
3518
3519 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3520 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3521 const char* optionString = option->optionString;
3522 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3523 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3524 jio_fprintf(defaultStream::error_stream(),
3525 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3526 return JNI_ERR;
3527 }
3528 }
3529
3530 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3531
3532 if (IgnoreUnrecognizedVMOptions) {
3533 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3534 // the JDK so it shouldn't have bad options.
3535 cur_cmd_args->ignoreUnrecognized = true;
3536 cur_java_tool_options_args->ignoreUnrecognized = true;
3537 cur_java_options_args->ignoreUnrecognized = true;
3538 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3539 }
3540
3541 if (PrintVMOptions) {
3542 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3543 print_options(cur_java_tool_options_args);
3544 print_options(cur_cmd_args);
3545 print_options(cur_java_options_args);
3546 print_options(cur_jdk_aot_vm_options_args);
3547 }
3548
3549 // Apply the settings in these args to the JVM global flags.
3550 jint result = parse_vm_init_args(&all_args);
3551
3552 if (result != JNI_OK) {
3553 return result;
3554 }
3555
3556 // Delay warning until here so that we've had a chance to process
3557 // the -XX:-PrintWarnings flag
3558 if (needs_hotspotrc_warning) {
3559 warning("%s file is present but has been ignored. "
3560 "Run with -XX:Flags=%s to load the file.",
3561 hotspotrc, hotspotrc);
3562 }
3563
3564 if (needs_module_property_warning) {
3565 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3566 " names that are reserved for internal use.");
3567 }
3568
3569 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3570 UNSUPPORTED_OPTION(UseLargePages);
3571 #endif
3572
3573 #if defined(AIX)
3574 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3575 #endif
3576
3577 #ifndef PRODUCT
3578 if (TraceBytecodesAt != 0) {
3579 TraceBytecodes = true;
3580 }
3581 #endif // PRODUCT
3582
3583 if (ScavengeRootsInCode == 0) {
3584 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3585 warning("Forcing ScavengeRootsInCode non-zero");
3586 }
3587 ScavengeRootsInCode = 1;
3588 }
3589
3590 if (!handle_deprecated_print_gc_flags()) {
3591 return JNI_EINVAL;
3592 }
3593
3594 // Set object alignment values.
3595 set_object_alignment();
3596
3597 #if !INCLUDE_CDS
3598 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3599 jio_fprintf(defaultStream::error_stream(),
3600 "Shared spaces are not supported in this VM\n");
3601 return JNI_ERR;
3602 }
3603 if (DumpLoadedClassList != nullptr) {
3604 jio_fprintf(defaultStream::error_stream(),
3605 "DumpLoadedClassList is not supported in this VM\n");
3606 return JNI_ERR;
3607 }
3608 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3609 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3610 warning("Shared spaces are not supported in this VM");
3611 UseSharedSpaces = false;
3612 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3613 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3614 }
3615 no_shared_spaces("CDS Disabled");
3616 #endif // INCLUDE_CDS
3617
3618 // Verify NMT arguments
3619 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3620 if (lvl == NMT_unknown) {
3621 jio_fprintf(defaultStream::error_stream(),
3622 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3623 return JNI_ERR;
3624 }
3625 if (PrintNMTStatistics && lvl == NMT_off) {
3626 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3627 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3628 }
3629
3630 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3631 if (trace_dependencies && VerifyDependencies) {
3632 warning("dependency logging results may be inflated by VerifyDependencies");
3633 }
3634
3635 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3636 log_is_enabled(Info, class, load, cause);
3637 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3638 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3639 }
3640
3641 apply_debugger_ergo();
3642
3643 // The VMThread needs to stop now and then to execute these debug options.
3644 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3645 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3646 }
3647
3648 if (log_is_enabled(Info, arguments)) {
3649 LogStream st(Log(arguments)::info());
3650 Arguments::print_on(&st);
3651 }
3652
3653 return JNI_OK;
3654 }
3655
3656 void Arguments::set_compact_headers_flags() {
3657 #ifdef _LP64
3658 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3659 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3660 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3661 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3662
3663 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3664 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3665 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3666 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3667 } else {
3668 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3669 }
3670 }
3671 #endif
3672 }
3673
3674 jint Arguments::apply_ergo() {
3675 // Set flags based on ergonomics.
3676 jint result = set_ergonomics_flags();
3677 if (result != JNI_OK) return result;
3678
3679 // Set heap size based on available physical memory
3680 set_heap_size();
3681
3682 GCConfig::arguments()->initialize();
3683
3684 set_compact_headers_flags();
3685
3686 CompressedKlassPointers::pre_initialize();
3687
3688 CDSConfig::ergo_initialize();
3689
3690 // Initialize Metaspace flags and alignments
3691 Metaspace::ergo_initialize();
3692
3693 if (!StringDedup::ergo_initialize()) {
3694 return JNI_EINVAL;
3695 }
3696
3697 // Set compiler flags after GC is selected and GC specific
3698 // flags (LoopStripMiningIter) are set.
3699 CompilerConfig::ergo_initialize();
3700
3701 // Set bytecode rewriting flags
3702 set_bytecode_flags();
3703
3704 // Set flags if aggressive optimization flags are enabled
3705 jint code = set_aggressive_opts_flags();
3706 if (code != JNI_OK) {
3707 return code;
3708 }
3709
3710 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3711 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3712 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3713 warning("UseSecondarySupersTable is not supported");
3714 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3715 }
3716 if (!UseSecondarySupersTable) {
3717 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3718 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3719 }
3720
3721 #ifdef ZERO
3722 // Clear flags not supported on zero.
3723 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3724 #endif // ZERO
3725
3726 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3727 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3728 DebugNonSafepoints = true;
3729 }
3730
3731 // Treat the odd case where local verification is enabled but remote
3732 // verification is not as if both were enabled.
3733 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3734 log_info(verification)("Turning on remote verification because local verification is on");
3735 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3736 }
3737
3738 #ifndef PRODUCT
3739 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3740 if (use_vm_log()) {
3741 LogVMOutput = true;
3742 }
3743 }
3744 #endif // PRODUCT
3745
3746 if (PrintCommandLineFlags) {
3747 JVMFlag::printSetFlags(tty);
3748 }
3749
3750 #if COMPILER2_OR_JVMCI
3751 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3752 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3753 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3754 }
3755 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3756
3757 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3758 if (!EnableVectorReboxing) {
3759 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3760 } else {
3761 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3762 }
3763 }
3764 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3765 }
3766 #endif // COMPILER2_OR_JVMCI
3767
3768 #ifdef COMPILER2
3769 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3770 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3771 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3772 }
3773 #endif // COMPILER2
3774
3775 if (log_is_enabled(Info, perf, class, link)) {
3776 if (!UsePerfData) {
3777 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3778 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3779 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3780 }
3781 }
3782
3783 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3784 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3785 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3786 }
3787 }
3788 return JNI_OK;
3789 }
3790
3791 jint Arguments::adjust_after_os() {
3792 if (UseNUMA) {
3793 if (UseParallelGC) {
3794 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3795 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3796 }
3797 }
3798 }
3799 return JNI_OK;
3800 }
3801
3802 int Arguments::PropertyList_count(SystemProperty* pl) {
3803 int count = 0;
3804 while(pl != nullptr) {
3805 count++;
3806 pl = pl->next();
3807 }
3808 return count;
3809 }
3810
3811 // Return the number of readable properties.
3812 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3813 int count = 0;
3814 while(pl != nullptr) {
3815 if (pl->readable()) {
3816 count++;
3817 }
3818 pl = pl->next();
3819 }
3820 return count;
3821 }
3822
3823 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3824 assert(key != nullptr, "just checking");
3825 SystemProperty* prop;
3826 for (prop = pl; prop != nullptr; prop = prop->next()) {
3827 if (strcmp(key, prop->key()) == 0) return prop->value();
3828 }
3829 return nullptr;
3830 }
3831
3832 // Return the value of the requested property provided that it is a readable property.
3833 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3834 assert(key != nullptr, "just checking");
3835 SystemProperty* prop;
3836 // Return the property value if the keys match and the property is not internal or
3837 // it's the special internal property "jdk.boot.class.path.append".
3838 for (prop = pl; prop != nullptr; prop = prop->next()) {
3839 if (strcmp(key, prop->key()) == 0) {
3840 if (!prop->internal()) {
3841 return prop->value();
3842 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3843 return prop->value();
3844 } else {
3845 // Property is internal and not jdk.boot.class.path.append so return null.
3846 return nullptr;
3847 }
3848 }
3849 }
3850 return nullptr;
3851 }
3852
3853 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3854 SystemProperty* p = *plist;
3855 if (p == nullptr) {
3856 *plist = new_p;
3857 } else {
3858 while (p->next() != nullptr) {
3859 p = p->next();
3860 }
3861 p->set_next(new_p);
3862 }
3863 }
3864
3865 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3866 bool writeable, bool internal) {
3867 if (plist == nullptr)
3868 return;
3869
3870 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3871 PropertyList_add(plist, new_p);
3872 }
3873
3874 void Arguments::PropertyList_add(SystemProperty *element) {
3875 PropertyList_add(&_system_properties, element);
3876 }
3877
3878 // This add maintains unique property key in the list.
3879 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3880 PropertyAppendable append, PropertyWriteable writeable,
3881 PropertyInternal internal) {
3882 if (plist == nullptr)
3883 return;
3884
3885 // If property key exists and is writeable, then update with new value.
3886 // Trying to update a non-writeable property is silently ignored.
3887 SystemProperty* prop;
3888 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3889 if (strcmp(k, prop->key()) == 0) {
3890 if (append == AppendProperty) {
3891 prop->append_writeable_value(v);
3892 } else {
3893 prop->set_writeable_value(v);
3894 }
3895 return;
3896 }
3897 }
3898
3899 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3900 }
3901
3902 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3903 // Returns true if all of the source pointed by src has been copied over to
3904 // the destination buffer pointed by buf. Otherwise, returns false.
3905 // Notes:
3906 // 1. If the length (buflen) of the destination buffer excluding the
3907 // null terminator character is not long enough for holding the expanded
3908 // pid characters, it also returns false instead of returning the partially
3909 // expanded one.
3910 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3911 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3912 char* buf, size_t buflen) {
3913 const char* p = src;
3914 char* b = buf;
3915 const char* src_end = &src[srclen];
3916 char* buf_end = &buf[buflen - 1];
3917
3918 while (p < src_end && b < buf_end) {
3919 if (*p == '%') {
3920 switch (*(++p)) {
3921 case '%': // "%%" ==> "%"
3922 *b++ = *p++;
3923 break;
3924 case 'p': { // "%p" ==> current process id
3925 // buf_end points to the character before the last character so
3926 // that we could write '\0' to the end of the buffer.
3927 size_t buf_sz = buf_end - b + 1;
3928 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3929
3930 // if jio_snprintf fails or the buffer is not long enough to hold
3931 // the expanded pid, returns false.
3932 if (ret < 0 || ret >= (int)buf_sz) {
3933 return false;
3934 } else {
3935 b += ret;
3936 assert(*b == '\0', "fail in copy_expand_pid");
3937 if (p == src_end && b == buf_end + 1) {
3938 // reach the end of the buffer.
3939 return true;
3940 }
3941 }
3942 p++;
3943 break;
3944 }
3945 default :
3946 *b++ = '%';
3947 }
3948 } else {
3949 *b++ = *p++;
3950 }
3951 }
3952 *b = '\0';
3953 return (p == src_end); // return false if not all of the source was copied
3954 }