1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotLogging.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "cppstdlib/limits.hpp"
35 #include "gc/shared/gc_globals.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/genArguments.hpp"
39 #include "gc/shared/stringdedup/stringDedup.hpp"
40 #include "gc/shared/tlab_globals.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logConfiguration.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "nmt/nmtCommon.hpp"
48 #include "oops/compressedKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/objLayout.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "prims/jvmtiAgentList.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/flags/jvmFlag.hpp"
56 #include "runtime/flags/jvmFlagAccess.hpp"
57 #include "runtime/flags/jvmFlagLimit.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/os.hpp"
61 #include "runtime/safepoint.hpp"
62 #include "runtime/safepointMechanism.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/management.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/checkedCast.hpp"
68 #include "utilities/debug.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/macros.hpp"
71 #include "utilities/parseInteger.hpp"
72 #include "utilities/powerOfTwo.hpp"
73 #include "utilities/stringUtils.hpp"
74 #include "utilities/systemMemoryBarrier.hpp"
75 #if INCLUDE_JFR
76 #include "jfr/jfr.hpp"
77 #endif
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 unsigned int Arguments::_addmods_count = 0;
89 #if INCLUDE_JVMCI
90 bool Arguments::_jvmci_module_added = false;
91 #endif
92 char* Arguments::_java_command = nullptr;
93 SystemProperty* Arguments::_system_properties = nullptr;
94 size_t Arguments::_conservative_max_heap_alignment = 0;
95 Arguments::Mode Arguments::_mode = _mixed;
96 const char* Arguments::_java_vendor_url_bug = nullptr;
97 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
98 bool Arguments::_executing_unit_tests = false;
99
100 // These parameters are reset in method parse_vm_init_args()
101 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
102 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
103 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
104 bool Arguments::_ClipInlining = ClipInlining;
105 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
106
107 bool Arguments::_enable_preview = false;
108 bool Arguments::_has_jdwp_agent = false;
109
110 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
111
112 // These are not set by the JDK's built-in launchers, but they can be set by
113 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
114 // JavaVMOption in jni.h.
115 abort_hook_t Arguments::_abort_hook = nullptr;
116 exit_hook_t Arguments::_exit_hook = nullptr;
117 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
118
119
120 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
121 SystemProperty *Arguments::_java_library_path = nullptr;
122 SystemProperty *Arguments::_java_home = nullptr;
123 SystemProperty *Arguments::_java_class_path = nullptr;
124 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
125 SystemProperty *Arguments::_vm_info = nullptr;
126
127 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
128 PathString *Arguments::_boot_class_path = nullptr;
129 bool Arguments::_has_jimage = false;
130
131 char* Arguments::_ext_dirs = nullptr;
132
133 // True if -Xshare:auto option was specified.
134 static bool xshare_auto_cmd_line = false;
135
136 // True if -Xint/-Xmixed/-Xcomp were specified
137 static bool mode_flag_cmd_line = false;
138
139 struct VMInitArgsGroup {
140 const JavaVMInitArgs* _args;
141 JVMFlagOrigin _origin;
142 };
143
144 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
145 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
146 if (new_value == nullptr) {
147 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
148 return false;
149 }
150 if (_value != nullptr) {
151 FreeHeap(_value);
152 }
153 _value = new_value;
154 strcpy(_value, value);
155 return true;
156 }
157
158 void PathString::append_value(const char *value) {
159 char *sp;
160 size_t len = 0;
161 if (value != nullptr) {
162 len = strlen(value);
163 if (_value != nullptr) {
164 len += strlen(_value);
165 }
166 sp = AllocateHeap(len+2, mtArguments);
167 assert(sp != nullptr, "Unable to allocate space for new append path value");
168 if (sp != nullptr) {
169 if (_value != nullptr) {
170 strcpy(sp, _value);
171 strcat(sp, os::path_separator());
172 strcat(sp, value);
173 FreeHeap(_value);
174 } else {
175 strcpy(sp, value);
176 }
177 _value = sp;
178 }
179 }
180 }
181
182 PathString::PathString(const char* value) {
183 if (value == nullptr) {
184 _value = nullptr;
185 } else {
186 _value = AllocateHeap(strlen(value)+1, mtArguments);
187 strcpy(_value, value);
188 }
189 }
190
191 PathString::~PathString() {
192 if (_value != nullptr) {
193 FreeHeap(_value);
194 _value = nullptr;
195 }
196 }
197
198 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
199 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
200 size_t len = strlen(module_name) + 1;
201 _module_name = AllocateHeap(len, mtInternal);
202 strncpy(_module_name, module_name, len); // copy the trailing null
203 _path = new PathString(path);
204 }
205
206 ModulePatchPath::~ModulePatchPath() {
207 if (_module_name != nullptr) {
208 FreeHeap(_module_name);
209 _module_name = nullptr;
210 }
211 if (_path != nullptr) {
212 delete _path;
213 _path = nullptr;
214 }
215 }
216
217 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
218 if (key == nullptr) {
219 _key = nullptr;
220 } else {
221 _key = AllocateHeap(strlen(key)+1, mtArguments);
222 strcpy(_key, key);
223 }
224 _next = nullptr;
225 _internal = internal;
226 _writeable = writeable;
227 }
228
229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
230 // part of the option string.
231 static bool match_option(const JavaVMOption *option, const char* name,
232 const char** tail) {
233 size_t len = strlen(name);
234 if (strncmp(option->optionString, name, len) == 0) {
235 *tail = option->optionString + len;
236 return true;
237 } else {
238 return false;
239 }
240 }
241
242 // Check if 'option' matches 'name'. No "tail" is allowed.
243 static bool match_option(const JavaVMOption *option, const char* name) {
244 const char* tail = nullptr;
245 bool result = match_option(option, name, &tail);
246 if (tail != nullptr && *tail == '\0') {
247 return result;
248 } else {
249 return false;
250 }
251 }
252
253 // Return true if any of the strings in null-terminated array 'names' matches.
254 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
255 // the option must match exactly.
256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
257 bool tail_allowed) {
258 for (/* empty */; *names != nullptr; ++names) {
259 if (match_option(option, *names, tail)) {
260 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
261 return true;
262 }
263 }
264 }
265 return false;
266 }
267
268 #if INCLUDE_JFR
269 static bool _has_jfr_option = false; // is using JFR
270
271 // return true on failure
272 static bool match_jfr_option(const JavaVMOption** option) {
273 assert((*option)->optionString != nullptr, "invariant");
274 char* tail = nullptr;
275 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
276 _has_jfr_option = true;
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 _has_jfr_option = true;
280 return Jfr::on_flight_recorder_option(option, tail);
281 }
282 return false;
283 }
284
285 bool Arguments::has_jfr_option() {
286 return _has_jfr_option;
287 }
288 #endif
289
290 static void logOption(const char* opt) {
291 if (PrintVMOptions) {
292 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
293 }
294 }
295
296 bool needs_module_property_warning = false;
297
298 #define MODULE_PROPERTY_PREFIX "jdk.module."
299 #define MODULE_PROPERTY_PREFIX_LEN 11
300 #define ADDEXPORTS "addexports"
301 #define ADDEXPORTS_LEN 10
302 #define ADDREADS "addreads"
303 #define ADDREADS_LEN 8
304 #define ADDOPENS "addopens"
305 #define ADDOPENS_LEN 8
306 #define PATCH "patch"
307 #define PATCH_LEN 5
308 #define ADDMODS "addmods"
309 #define ADDMODS_LEN 7
310 #define LIMITMODS "limitmods"
311 #define LIMITMODS_LEN 9
312 #define PATH "path"
313 #define PATH_LEN 4
314 #define UPGRADE_PATH "upgrade.path"
315 #define UPGRADE_PATH_LEN 12
316 #define ENABLE_NATIVE_ACCESS "enable.native.access"
317 #define ENABLE_NATIVE_ACCESS_LEN 20
318 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
319 #define ILLEGAL_NATIVE_ACCESS_LEN 21
320 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
321 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
322 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
323 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
324
325 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
326 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
327 return ((strncmp(option, property, len) == 0) &&
328 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
329 }
330
331 // Return true if property starts with "jdk.module." and its ensuing chars match
332 // any of the reserved module properties.
333 // property should be passed without the leading "-D".
334 bool Arguments::is_internal_module_property(const char* property) {
335 return internal_module_property_helper(property, false);
336 }
337
338 // Returns true if property is one of those recognized by is_internal_module_property() but
339 // is not supported by CDS archived full module graph.
340 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
341 return internal_module_property_helper(property, true);
342 }
343
344 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
345 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
346 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
347 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
348 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
349 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
350 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
351 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
352 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
353 return true;
354 }
355
356 if (!check_for_cds) {
357 // CDS notes: these properties are supported by CDS archived full module graph.
358 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
359 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
360 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
361 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
362 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
363 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
364 return true;
365 }
366 }
367 }
368 return false;
369 }
370
371 // Process java launcher properties.
372 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
373 // See if sun.java.launcher is defined.
374 // Must do this before setting up other system properties,
375 // as some of them may depend on launcher type.
376 for (int index = 0; index < args->nOptions; index++) {
377 const JavaVMOption* option = args->options + index;
378 const char* tail;
379
380 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
381 process_java_launcher_argument(tail, option->extraInfo);
382 continue;
383 }
384 if (match_option(option, "-XX:+ExecutingUnitTests")) {
385 _executing_unit_tests = true;
386 continue;
387 }
388 }
389 }
390
391 // Initialize system properties key and value.
392 void Arguments::init_system_properties() {
393
394 // Set up _boot_class_path which is not a property but
395 // relies heavily on argument processing and the jdk.boot.class.path.append
396 // property. It is used to store the underlying boot class path.
397 _boot_class_path = new PathString(nullptr);
398
399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
400 "Java Virtual Machine Specification", false));
401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
402 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
403 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
404
405 // Initialize the vm.info now, but it will need updating after argument parsing.
406 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
407
408 // Following are JVMTI agent writable properties.
409 // Properties values are set to nullptr and they are
410 // os specific they are initialized in os::init_system_properties_values().
411 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
412 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
413 _java_home = new SystemProperty("java.home", nullptr, true);
414 _java_class_path = new SystemProperty("java.class.path", "", true);
415 // jdk.boot.class.path.append is a non-writeable, internal property.
416 // It can only be set by either:
417 // - -Xbootclasspath/a:
418 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
419 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
420
421 // Add to System Property list.
422 PropertyList_add(&_system_properties, _sun_boot_library_path);
423 PropertyList_add(&_system_properties, _java_library_path);
424 PropertyList_add(&_system_properties, _java_home);
425 PropertyList_add(&_system_properties, _java_class_path);
426 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
427 PropertyList_add(&_system_properties, _vm_info);
428
429 // Set OS specific system properties values
430 os::init_system_properties_values();
431 }
432
433 // Update/Initialize System properties after JDK version number is known
434 void Arguments::init_version_specific_system_properties() {
435 enum { bufsz = 16 };
436 char buffer[bufsz];
437 const char* spec_vendor = "Oracle Corporation";
438 uint32_t spec_version = JDK_Version::current().major_version();
439
440 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
441
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.specification.version", buffer, false));
446 PropertyList_add(&_system_properties,
447 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
448 }
449
450 /*
451 * -XX argument processing:
452 *
453 * -XX arguments are defined in several places, such as:
454 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
455 * -XX arguments are parsed in parse_argument().
456 * -XX argument bounds checking is done in check_vm_args_consistency().
457 *
458 * Over time -XX arguments may change. There are mechanisms to handle common cases:
459 *
460 * ALIASED: An option that is simply another name for another option. This is often
461 * part of the process of deprecating a flag, but not all aliases need
462 * to be deprecated.
463 *
464 * Create an alias for an option by adding the old and new option names to the
465 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
466 *
467 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
468 * support may be removed in the future. Both regular and aliased options may be
469 * deprecated.
470 *
471 * Add a deprecation warning for an option (or alias) by adding an entry in the
472 * "special_jvm_flags" table and setting the "deprecated_in" field.
473 * Often an option "deprecated" in one major release will
474 * be made "obsolete" in the next. In this case the entry should also have its
475 * "obsolete_in" field set.
476 *
477 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
478 * on the command line. A warning is printed to let the user know that option might not
479 * be accepted in the future.
480 *
481 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
482 * table and setting the "obsolete_in" field.
483 *
484 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
485 * to the current JDK version. The system will flatly refuse to admit the existence of
486 * the flag. This allows a flag to die automatically over JDK releases.
487 *
488 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
489 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
490 * - Newly obsolete or expired deprecated options should have their global variable
491 * definitions removed (from globals.hpp, etc) and related implementations removed.
492 *
493 * Recommended approach for removing options:
494 *
495 * To remove options commonly used by customers (e.g. product -XX options), use
496 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
497 *
498 * To remove internal options (e.g. diagnostic, experimental, develop options), use
499 * a 2-step model adding major release numbers to the obsolete and expire columns.
500 *
501 * To change the name of an option, use the alias table as well as a 2-step
502 * model adding major release numbers to the deprecate and expire columns.
503 * Think twice about aliasing commonly used customer options.
504 *
505 * There are times when it is appropriate to leave a future release number as undefined.
506 *
507 * Tests: Aliases should be tested in VMAliasOptions.java.
508 * Deprecated options should be tested in VMDeprecatedOptions.java.
509 */
510
511 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
512 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
513 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
514 // the command-line as usual, but will issue a warning.
515 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
516 // the command-line, while issuing a warning and ignoring the flag value.
517 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
518 // existence of the flag.
519 //
520 // MANUAL CLEANUP ON JDK VERSION UPDATES:
521 // This table ensures that the handling of options will update automatically when the JDK
522 // version is incremented, but the source code needs to be cleanup up manually:
523 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
524 // variable should be removed, as well as users of the variable.
525 // - As "deprecated" options age into "obsolete" options, move the entry into the
526 // "Obsolete Flags" section of the table.
527 // - All expired options should be removed from the table.
528 static SpecialFlag const special_jvm_flags[] = {
529 // -------------- Deprecated Flags --------------
530 // --- Non-alias flags - sorted by obsolete_in then expired_in:
531 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
534 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
535 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
536 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
537 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
538 #ifdef _LP64
539 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
540 #endif
541 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
542 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
543 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
544 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
545 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
546 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
547 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
548 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
549 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
550
551 // -------------- Obsolete Flags - sorted by expired_in --------------
552
553 #ifdef LINUX
554 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
555 #endif
556 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
557 { "G1UpdateBufferSize", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
558 { "ShenandoahPacing", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
559 #if defined(AARCH64)
560 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
561 #endif
562
563 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
564 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
565 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
566 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
567 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
568 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
569 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
570 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
571 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
572 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
573 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
574 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
575 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
576 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
577 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
578 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
579
580 { "PretenureSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
581 { "HeapMaximumCompactionInterval",JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
582
583 #ifdef ASSERT
584 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
585 #endif
586
587 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
588 // These entries will generate build errors. Their purpose is to test the macros.
589 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
590 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
591 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
592 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
593 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
594 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
595 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
596 #endif
597
598 { nullptr, JDK_Version(0), JDK_Version(0) }
599 };
600
601 // Flags that are aliases for other flags.
602 typedef struct {
603 const char* alias_name;
604 const char* real_name;
605 } AliasedFlag;
606
607 static AliasedFlag const aliased_jvm_flags[] = {
608 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
609 { nullptr, nullptr}
610 };
611
612 // Return true if "v" is less than "other", where "other" may be "undefined".
613 static bool version_less_than(JDK_Version v, JDK_Version other) {
614 assert(!v.is_undefined(), "must be defined");
615 if (!other.is_undefined() && v.compare(other) >= 0) {
616 return false;
617 } else {
618 return true;
619 }
620 }
621
622 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
623 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
624 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
625 flag = special_jvm_flags[i];
626 return true;
627 }
628 }
629 return false;
630 }
631
632 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
633 assert(version != nullptr, "Must provide a version buffer");
634 SpecialFlag flag;
635 if (lookup_special_flag(flag_name, flag)) {
636 if (!flag.obsolete_in.is_undefined()) {
637 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
638 *version = flag.obsolete_in;
639 // This flag may have been marked for obsoletion in this version, but we may not
640 // have actually removed it yet. Rather than ignoring it as soon as we reach
641 // this version we allow some time for the removal to happen. So if the flag
642 // still actually exists we process it as normal, but issue an adjusted warning.
643 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
644 if (real_flag != nullptr) {
645 char version_str[256];
646 version->to_string(version_str, sizeof(version_str));
647 warning("Temporarily processing option %s; support is scheduled for removal in %s",
648 flag_name, version_str);
649 return false;
650 }
651 return true;
652 }
653 }
654 }
655 return false;
656 }
657
658 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
659 assert(version != nullptr, "Must provide a version buffer");
660 SpecialFlag flag;
661 if (lookup_special_flag(flag_name, flag)) {
662 if (!flag.deprecated_in.is_undefined()) {
663 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
664 version_less_than(JDK_Version::current(), flag.expired_in)) {
665 *version = flag.deprecated_in;
666 return 1;
667 } else {
668 return -1;
669 }
670 }
671 }
672 return 0;
673 }
674
675 const char* Arguments::real_flag_name(const char *flag_name) {
676 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
677 const AliasedFlag& flag_status = aliased_jvm_flags[i];
678 if (strcmp(flag_status.alias_name, flag_name) == 0) {
679 return flag_status.real_name;
680 }
681 }
682 return flag_name;
683 }
684
685 #ifdef ASSERT
686 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
687 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
688 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
689 return true;
690 }
691 }
692 return false;
693 }
694
695 // Verifies the correctness of the entries in the special_jvm_flags table.
696 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
697 // version being earlier than the deprecation version, then a warning is issued
698 // and verification fails - by returning false. If it is detected that the table
699 // is out of date, with respect to the current version, then ideally a warning is
700 // issued but verification does not fail. This allows the VM to operate when the
701 // version is first updated, without needing to update all the impacted flags at
702 // the same time. In practice we can't issue the warning immediately when the version
703 // is updated as it occurs for every test and some tests are not prepared to handle
704 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
705 // if the check_globals flag is true, and in addition allow a grace period and only
706 // check for stale flags when we hit build 25 (which is far enough into the 6 month
707 // release cycle that all flag updates should have been processed, whilst still
708 // leaving time to make the change before RDP2).
709 // We use a gtest to call this, passing true, so that we can detect stale flags before
710 // the end of the release cycle.
711
712 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
713
714 bool Arguments::verify_special_jvm_flags(bool check_globals) {
715 bool success = true;
716 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
717 const SpecialFlag& flag = special_jvm_flags[i];
718 if (lookup_special_flag(flag.name, i)) {
719 warning("Duplicate special flag declaration \"%s\"", flag.name);
720 success = false;
721 }
722 if (flag.deprecated_in.is_undefined() &&
723 flag.obsolete_in.is_undefined()) {
724 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
725 success = false;
726 }
727
728 if (!flag.deprecated_in.is_undefined()) {
729 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
730 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
731 success = false;
732 }
733
734 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
735 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
736 success = false;
737 }
738 }
739
740 if (!flag.obsolete_in.is_undefined()) {
741 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
742 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
743 success = false;
744 }
745
746 // if flag has become obsolete it should not have a "globals" flag defined anymore.
747 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
748 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
749 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
750 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
751 success = false;
752 }
753 }
754
755 } else if (!flag.expired_in.is_undefined()) {
756 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
757 success = false;
758 }
759
760 if (!flag.expired_in.is_undefined()) {
761 // if flag has become expired it should not have a "globals" flag defined anymore.
762 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
763 !version_less_than(JDK_Version::current(), flag.expired_in)) {
764 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
765 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
766 success = false;
767 }
768 }
769 }
770 }
771 return success;
772 }
773 #endif
774
775 bool Arguments::atojulong(const char *s, julong* result) {
776 return parse_integer(s, result);
777 }
778
779 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
780 if (size < min_size) return arg_too_small;
781 if (size > max_size) return arg_too_big;
782 return arg_in_range;
783 }
784
785 // Describe an argument out of range error
786 void Arguments::describe_range_error(ArgsRange errcode) {
787 switch(errcode) {
788 case arg_too_big:
789 jio_fprintf(defaultStream::error_stream(),
790 "The specified size exceeds the maximum "
791 "representable size.\n");
792 break;
793 case arg_too_small:
794 case arg_unreadable:
795 case arg_in_range:
796 // do nothing for now
797 break;
798 default:
799 ShouldNotReachHere();
800 }
801 }
802
803 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
804 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
805 return true;
806 } else {
807 return false;
808 }
809 }
810
811 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
812 // strtod allows leading whitespace, but our flag format does not.
813 if (*value == '\0' || isspace((unsigned char) *value)) {
814 return false;
815 }
816 char* end;
817 errno = 0;
818 double v = strtod(value, &end);
819 if ((errno != 0) || (*end != 0)) {
820 return false;
821 }
822 if (g_isnan(v) || !g_isfinite(v)) {
823 // Currently we cannot handle these special values.
824 return false;
825 }
826
827 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
828 return true;
829 }
830 return false;
831 }
832
833 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
834 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
835
836 if (flag->is_int()) {
837 int v;
838 if (parse_integer(value, &v)) {
839 result = JVMFlagAccess::set_int(flag, &v, origin);
840 }
841 } else if (flag->is_uint()) {
842 uint v;
843 if (parse_integer(value, &v)) {
844 result = JVMFlagAccess::set_uint(flag, &v, origin);
845 }
846 } else if (flag->is_intx()) {
847 intx v;
848 if (parse_integer(value, &v)) {
849 result = JVMFlagAccess::set_intx(flag, &v, origin);
850 }
851 } else if (flag->is_uintx()) {
852 uintx v;
853 if (parse_integer(value, &v)) {
854 result = JVMFlagAccess::set_uintx(flag, &v, origin);
855 }
856 } else if (flag->is_uint64_t()) {
857 uint64_t v;
858 if (parse_integer(value, &v)) {
859 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
860 }
861 } else if (flag->is_size_t()) {
862 size_t v;
863 if (parse_integer(value, &v)) {
864 result = JVMFlagAccess::set_size_t(flag, &v, origin);
865 }
866 }
867
868 return result == JVMFlag::SUCCESS;
869 }
870
871 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
872 if (value[0] == '\0') {
873 value = nullptr;
874 }
875 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
876 // Contract: JVMFlag always returns a pointer that needs freeing.
877 FREE_C_HEAP_ARRAY(char, value);
878 return true;
879 }
880
881 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
882 const char* old_value = "";
883 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
884 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
885 size_t new_len = strlen(new_value);
886 const char* value;
887 char* free_this_too = nullptr;
888 if (old_len == 0) {
889 value = new_value;
890 } else if (new_len == 0) {
891 value = old_value;
892 } else {
893 size_t length = old_len + 1 + new_len + 1;
894 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
895 // each new setting adds another LINE to the switch:
896 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
897 value = buf;
898 free_this_too = buf;
899 }
900 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
901 // JVMFlag always returns a pointer that needs freeing.
902 FREE_C_HEAP_ARRAY(char, value);
903 // JVMFlag made its own copy, so I must delete my own temp. buffer.
904 FREE_C_HEAP_ARRAY(char, free_this_too);
905 return true;
906 }
907
908 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
909 const char* real_name = real_flag_name(arg);
910 JDK_Version since = JDK_Version();
911 switch (is_deprecated_flag(arg, &since)) {
912 case -1: {
913 // Obsolete or expired, so don't process normally,
914 // but allow for an obsolete flag we're still
915 // temporarily allowing.
916 if (!is_obsolete_flag(arg, &since)) {
917 return real_name;
918 }
919 // Note if we're not considered obsolete then we can't be expired either
920 // as obsoletion must come first.
921 return nullptr;
922 }
923 case 0:
924 return real_name;
925 case 1: {
926 char version[256];
927 since.to_string(version, sizeof(version));
928 if (real_name != arg) {
929 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
930 arg, version, real_name);
931 } else {
932 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
933 arg, version);
934 }
935 return real_name;
936 }
937 }
938 ShouldNotReachHere();
939 return nullptr;
940 }
941
942 #define BUFLEN 255
943
944 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
945 char name_copied[BUFLEN+1];
946 if (name[name_length] != 0) {
947 if (name_length > BUFLEN) {
948 return nullptr;
949 } else {
950 strncpy(name_copied, name, name_length);
951 name_copied[name_length] = '\0';
952 name = name_copied;
953 }
954 }
955
956 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
957 if (real_name == nullptr) {
958 return nullptr;
959 }
960 JVMFlag* flag = JVMFlag::find_flag(real_name);
961 return flag;
962 }
963
964 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
965 bool is_bool = false;
966 bool bool_val = false;
967 char c = *arg;
968 if (c == '+' || c == '-') {
969 is_bool = true;
970 bool_val = (c == '+');
971 arg++;
972 }
973
974 const char* name = arg;
975 while (true) {
976 c = *arg;
977 if (isalnum(c) || (c == '_')) {
978 ++arg;
979 } else {
980 break;
981 }
982 }
983
984 size_t name_len = size_t(arg - name);
985 if (name_len == 0) {
986 return false;
987 }
988
989 JVMFlag* flag = find_jvm_flag(name, name_len);
990 if (flag == nullptr) {
991 return false;
992 }
993
994 if (is_bool) {
995 if (*arg != 0) {
996 // Error -- extra characters such as -XX:+BoolFlag=123
997 return false;
998 }
999 return set_bool_flag(flag, bool_val, origin);
1000 }
1001
1002 if (arg[0] == '=') {
1003 const char* value = arg + 1;
1004 if (flag->is_ccstr()) {
1005 if (flag->ccstr_accumulates()) {
1006 return append_to_string_flag(flag, value, origin);
1007 } else {
1008 return set_string_flag(flag, value, origin);
1009 }
1010 } else if (flag->is_double()) {
1011 return set_fp_numeric_flag(flag, value, origin);
1012 } else {
1013 return set_numeric_flag(flag, value, origin);
1014 }
1015 }
1016
1017 if (arg[0] == ':' && arg[1] == '=') {
1018 // -XX:Foo:=xxx will reset the string flag to the given value.
1019 const char* value = arg + 2;
1020 return set_string_flag(flag, value, origin);
1021 }
1022
1023 return false;
1024 }
1025
1026 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1027 assert(bldarray != nullptr, "illegal argument");
1028
1029 if (arg == nullptr) {
1030 return;
1031 }
1032
1033 int new_count = *count + 1;
1034
1035 // expand the array and add arg to the last element
1036 if (*bldarray == nullptr) {
1037 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1038 } else {
1039 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1040 }
1041 (*bldarray)[*count] = os::strdup_check_oom(arg);
1042 *count = new_count;
1043 }
1044
1045 void Arguments::build_jvm_args(const char* arg) {
1046 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1047 }
1048
1049 void Arguments::build_jvm_flags(const char* arg) {
1050 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1051 }
1052
1053 // utility function to return a string that concatenates all
1054 // strings in a given char** array
1055 const char* Arguments::build_resource_string(char** args, int count) {
1056 if (args == nullptr || count == 0) {
1057 return nullptr;
1058 }
1059 size_t length = 0;
1060 for (int i = 0; i < count; i++) {
1061 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1062 }
1063 char* s = NEW_RESOURCE_ARRAY(char, length);
1064 char* dst = s;
1065 for (int j = 0; j < count; j++) {
1066 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1067 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1068 dst += offset;
1069 length -= offset;
1070 }
1071 return (const char*) s;
1072 }
1073
1074 void Arguments::print_on(outputStream* st) {
1075 st->print_cr("VM Arguments:");
1076 if (num_jvm_flags() > 0) {
1077 st->print("jvm_flags: "); print_jvm_flags_on(st);
1078 st->cr();
1079 }
1080 if (num_jvm_args() > 0) {
1081 st->print("jvm_args: "); print_jvm_args_on(st);
1082 st->cr();
1083 }
1084 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1085 if (_java_class_path != nullptr) {
1086 char* path = _java_class_path->value();
1087 size_t len = strlen(path);
1088 st->print("java_class_path (initial): ");
1089 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1090 if (len == 0) {
1091 st->print_raw_cr("<not set>");
1092 } else {
1093 st->print_raw_cr(path, len);
1094 }
1095 }
1096 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1097 }
1098
1099 void Arguments::print_summary_on(outputStream* st) {
1100 // Print the command line. Environment variables that are helpful for
1101 // reproducing the problem are written later in the hs_err file.
1102 // flags are from setting file
1103 if (num_jvm_flags() > 0) {
1104 st->print_raw("Settings File: ");
1105 print_jvm_flags_on(st);
1106 st->cr();
1107 }
1108 // args are the command line and environment variable arguments.
1109 st->print_raw("Command Line: ");
1110 if (num_jvm_args() > 0) {
1111 print_jvm_args_on(st);
1112 }
1113 // this is the classfile and any arguments to the java program
1114 if (java_command() != nullptr) {
1115 st->print("%s", java_command());
1116 }
1117 st->cr();
1118 }
1119
1120 void Arguments::print_jvm_flags_on(outputStream* st) {
1121 if (_num_jvm_flags > 0) {
1122 for (int i=0; i < _num_jvm_flags; i++) {
1123 st->print("%s ", _jvm_flags_array[i]);
1124 }
1125 }
1126 }
1127
1128 void Arguments::print_jvm_args_on(outputStream* st) {
1129 if (_num_jvm_args > 0) {
1130 for (int i=0; i < _num_jvm_args; i++) {
1131 st->print("%s ", _jvm_args_array[i]);
1132 }
1133 }
1134 }
1135
1136 bool Arguments::process_argument(const char* arg,
1137 jboolean ignore_unrecognized,
1138 JVMFlagOrigin origin) {
1139 JDK_Version since = JDK_Version();
1140
1141 if (parse_argument(arg, origin)) {
1142 return true;
1143 }
1144
1145 // Determine if the flag has '+', '-', or '=' characters.
1146 bool has_plus_minus = (*arg == '+' || *arg == '-');
1147 const char* const argname = has_plus_minus ? arg + 1 : arg;
1148
1149 size_t arg_len;
1150 const char* equal_sign = strchr(argname, '=');
1151 if (equal_sign == nullptr) {
1152 arg_len = strlen(argname);
1153 } else {
1154 arg_len = equal_sign - argname;
1155 }
1156
1157 // Only make the obsolete check for valid arguments.
1158 if (arg_len <= BUFLEN) {
1159 // Construct a string which consists only of the argument name without '+', '-', or '='.
1160 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1161 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1162 if (is_obsolete_flag(stripped_argname, &since)) {
1163 char version[256];
1164 since.to_string(version, sizeof(version));
1165 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1166 return true;
1167 }
1168 }
1169
1170 // For locked flags, report a custom error message if available.
1171 // Otherwise, report the standard unrecognized VM option.
1172 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1173 if (found_flag != nullptr) {
1174 char locked_message_buf[BUFLEN];
1175 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1176 if (strlen(locked_message_buf) != 0) {
1177 #ifdef PRODUCT
1178 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1179 if (ignore_unrecognized && mismatched) {
1180 return true;
1181 }
1182 #endif
1183 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1184 }
1185 if (found_flag->is_bool() && !has_plus_minus) {
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Missing +/- setting for VM option '%s'\n", argname);
1188 } else if (!found_flag->is_bool() && has_plus_minus) {
1189 jio_fprintf(defaultStream::error_stream(),
1190 "Unexpected +/- setting in VM option '%s'\n", argname);
1191 } else {
1192 jio_fprintf(defaultStream::error_stream(),
1193 "Improperly specified VM option '%s'\n", argname);
1194 }
1195 } else {
1196 if (ignore_unrecognized) {
1197 return true;
1198 }
1199 jio_fprintf(defaultStream::error_stream(),
1200 "Unrecognized VM option '%s'\n", argname);
1201 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1202 if (fuzzy_matched != nullptr) {
1203 jio_fprintf(defaultStream::error_stream(),
1204 "Did you mean '%s%s%s'?\n",
1205 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1206 fuzzy_matched->name(),
1207 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1208 }
1209 }
1210
1211 // allow for commandline "commenting out" options like -XX:#+Verbose
1212 return arg[0] == '#';
1213 }
1214
1215 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1216 FILE* stream = os::fopen(file_name, "rb");
1217 if (stream == nullptr) {
1218 if (should_exist) {
1219 jio_fprintf(defaultStream::error_stream(),
1220 "Could not open settings file %s\n", file_name);
1221 return false;
1222 } else {
1223 return true;
1224 }
1225 }
1226
1227 char token[1024];
1228 int pos = 0;
1229
1230 bool in_white_space = true;
1231 bool in_comment = false;
1232 bool in_quote = false;
1233 int quote_c = 0;
1234 bool result = true;
1235
1236 int c = getc(stream);
1237 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1238 if (in_white_space) {
1239 if (in_comment) {
1240 if (c == '\n') in_comment = false;
1241 } else {
1242 if (c == '#') in_comment = true;
1243 else if (!isspace((unsigned char) c)) {
1244 in_white_space = false;
1245 token[pos++] = checked_cast<char>(c);
1246 }
1247 }
1248 } else {
1249 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1250 // token ends at newline, or at unquoted whitespace
1251 // this allows a way to include spaces in string-valued options
1252 token[pos] = '\0';
1253 logOption(token);
1254 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1255 build_jvm_flags(token);
1256 pos = 0;
1257 in_white_space = true;
1258 in_quote = false;
1259 } else if (!in_quote && (c == '\'' || c == '"')) {
1260 in_quote = true;
1261 quote_c = c;
1262 } else if (in_quote && (c == quote_c)) {
1263 in_quote = false;
1264 } else {
1265 token[pos++] = checked_cast<char>(c);
1266 }
1267 }
1268 c = getc(stream);
1269 }
1270 if (pos > 0) {
1271 token[pos] = '\0';
1272 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1273 build_jvm_flags(token);
1274 }
1275 fclose(stream);
1276 return result;
1277 }
1278
1279 //=============================================================================================================
1280 // Parsing of properties (-D)
1281
1282 const char* Arguments::get_property(const char* key) {
1283 return PropertyList_get_value(system_properties(), key);
1284 }
1285
1286 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1287 const char* eq = strchr(prop, '=');
1288 const char* key;
1289 const char* value = "";
1290
1291 if (eq == nullptr) {
1292 // property doesn't have a value, thus use passed string
1293 key = prop;
1294 } else {
1295 // property have a value, thus extract it and save to the
1296 // allocated string
1297 size_t key_len = eq - prop;
1298 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1299
1300 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1301 key = tmp_key;
1302
1303 value = &prop[key_len + 1];
1304 }
1305
1306 if (internal == ExternalProperty) {
1307 CDSConfig::check_incompatible_property(key, value);
1308 }
1309
1310 if (strcmp(key, "java.compiler") == 0) {
1311 // we no longer support java.compiler system property, log a warning and let it get
1312 // passed to Java, like any other system property
1313 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1314 // for applications using NONE or empty value, log a more informative message
1315 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1316 } else {
1317 warning("The java.compiler system property is obsolete and no longer supported.");
1318 }
1319 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1320 // append is true, writable is true, internal is false
1321 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1322 WriteableProperty, ExternalProperty);
1323 } else {
1324 if (strcmp(key, "sun.java.command") == 0) {
1325 char *old_java_command = _java_command;
1326 _java_command = os::strdup_check_oom(value, mtArguments);
1327 if (old_java_command != nullptr) {
1328 os::free(old_java_command);
1329 }
1330 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1331 // If this property is set on the command line then its value will be
1332 // displayed in VM error logs as the URL at which to submit such logs.
1333 // Normally the URL displayed in error logs is different from the value
1334 // of this system property, so a different property should have been
1335 // used here, but we leave this as-is in case someone depends upon it.
1336 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1337 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1338 // its value without going through the property list or making a Java call.
1339 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1340 if (old_java_vendor_url_bug != nullptr) {
1341 os::free((void *)old_java_vendor_url_bug);
1342 }
1343 }
1344
1345 // Create new property and add at the end of the list
1346 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1347 }
1348
1349 if (key != prop) {
1350 // SystemProperty copy passed value, thus free previously allocated
1351 // memory
1352 FreeHeap((void *)key);
1353 }
1354
1355 return true;
1356 }
1357
1358 //===========================================================================================================
1359 // Setting int/mixed/comp mode flags
1360
1361 void Arguments::set_mode_flags(Mode mode) {
1362 // Set up default values for all flags.
1363 // If you add a flag to any of the branches below,
1364 // add a default value for it here.
1365 _mode = mode;
1366
1367 // Ensure Agent_OnLoad has the correct initial values.
1368 // This may not be the final mode; mode may change later in onload phase.
1369 PropertyList_unique_add(&_system_properties, "java.vm.info",
1370 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1371
1372 UseInterpreter = true;
1373 UseCompiler = true;
1374 UseLoopCounter = true;
1375
1376 // Default values may be platform/compiler dependent -
1377 // use the saved values
1378 ClipInlining = Arguments::_ClipInlining;
1379 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1380 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1381 BackgroundCompilation = Arguments::_BackgroundCompilation;
1382
1383 // Change from defaults based on mode
1384 switch (mode) {
1385 default:
1386 ShouldNotReachHere();
1387 break;
1388 case _int:
1389 UseCompiler = false;
1390 UseLoopCounter = false;
1391 AlwaysCompileLoopMethods = false;
1392 UseOnStackReplacement = false;
1393 break;
1394 case _mixed:
1395 // same as default
1396 break;
1397 case _comp:
1398 UseInterpreter = false;
1399 BackgroundCompilation = false;
1400 ClipInlining = false;
1401 break;
1402 }
1403 }
1404
1405 // Conflict: required to use shared spaces (-Xshare:on), but
1406 // incompatible command line options were chosen.
1407 void Arguments::no_shared_spaces(const char* message) {
1408 if (RequireSharedSpaces) {
1409 aot_log_error(aot)("%s is incompatible with other specified options.",
1410 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1411 if (CDSConfig::new_aot_flags_used()) {
1412 vm_exit_during_initialization("Unable to use AOT cache", message);
1413 } else {
1414 vm_exit_during_initialization("Unable to use shared archive", message);
1415 }
1416 } else {
1417 if (CDSConfig::new_aot_flags_used()) {
1418 log_warning(aot)("Unable to use AOT cache: %s", message);
1419 } else {
1420 aot_log_info(aot)("Unable to use shared archive: %s", message);
1421 }
1422 UseSharedSpaces = false;
1423 }
1424 }
1425
1426 static void set_object_alignment() {
1427 // Object alignment.
1428 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1429 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1430 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1431 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1432 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1433 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1434
1435 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1436 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1437
1438 // Oop encoding heap max
1439 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1440 }
1441
1442 size_t Arguments::max_heap_for_compressed_oops() {
1443 // Avoid sign flip.
1444 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1445 // We need to fit both the null page and the heap into the memory budget, while
1446 // keeping alignment constraints of the heap. To guarantee the latter, as the
1447 // null page is located before the heap, we pad the null page to the conservative
1448 // maximum alignment that the GC may ever impose upon the heap.
1449 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1450 _conservative_max_heap_alignment);
1451
1452 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1453 NOT_LP64(ShouldNotReachHere(); return 0);
1454 }
1455
1456 void Arguments::set_use_compressed_oops() {
1457 #ifdef _LP64
1458 // MaxHeapSize is not set up properly at this point, but
1459 // the only value that can override MaxHeapSize if we are
1460 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1461 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1462
1463 if (max_heap_size <= max_heap_for_compressed_oops()) {
1464 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1465 FLAG_SET_ERGO(UseCompressedOops, true);
1466 }
1467 } else {
1468 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1469 warning("Max heap size too large for Compressed Oops");
1470 FLAG_SET_DEFAULT(UseCompressedOops, false);
1471 }
1472 }
1473 #endif // _LP64
1474 }
1475
1476 void Arguments::set_conservative_max_heap_alignment() {
1477 // The conservative maximum required alignment for the heap is the maximum of
1478 // the alignments imposed by several sources: any requirements from the heap
1479 // itself and the maximum page size we may run the VM with.
1480 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1481 _conservative_max_heap_alignment = MAX4(heap_alignment,
1482 os::vm_allocation_granularity(),
1483 os::max_page_size(),
1484 GCArguments::compute_heap_alignment());
1485 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1486 }
1487
1488 jint Arguments::set_ergonomics_flags() {
1489 GCConfig::initialize();
1490
1491 set_conservative_max_heap_alignment();
1492
1493 #ifdef _LP64
1494 set_use_compressed_oops();
1495
1496 // Also checks that certain machines are slower with compressed oops
1497 // in vm_version initialization code.
1498 #endif // _LP64
1499
1500 return JNI_OK;
1501 }
1502
1503 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1504 // The AggressiveHeap check is a temporary workaround to avoid calling
1505 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1506 // selected. This works because AggressiveHeap implies UseParallelGC
1507 // where we know the ratio will be 1. Once the AggressiveHeap option is
1508 // removed, this can be cleaned up.
1509 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1510 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1511 size_t max_allocatable = os::commit_memory_limit();
1512
1513 return MIN2(limit, max_allocatable / fraction);
1514 }
1515
1516 // Use static initialization to get the default before parsing
1517 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1518
1519 static size_t clamp_by_size_t_max(uint64_t value) {
1520 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1521 }
1522
1523 void Arguments::set_heap_size() {
1524 // Check if the user has configured any limit on the amount of RAM we may use.
1525 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1526 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1527 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1528 !FLAG_IS_DEFAULT(MaxRAM);
1529
1530 if (FLAG_IS_DEFAULT(MaxRAM)) {
1531 if (CompilerConfig::should_set_client_emulation_mode_flags()) {
1532 // Limit the available memory if client emulation mode is enabled.
1533 FLAG_SET_ERGO(MaxRAM, 1ULL*G);
1534 } else {
1535 // Use the available physical memory on the system.
1536 FLAG_SET_ERGO(MaxRAM, os::physical_memory());
1537 }
1538 }
1539
1540 // If the maximum heap size has not been set with -Xmx, then set it as
1541 // fraction of the size of physical memory, respecting the maximum and
1542 // minimum sizes of the heap.
1543 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1544 uint64_t min_memory = (uint64_t)(((double)MaxRAM * MinRAMPercentage) / 100);
1545 uint64_t max_memory = (uint64_t)(((double)MaxRAM * MaxRAMPercentage) / 100);
1546
1547 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1548 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1549
1550 if (reasonable_min < MaxHeapSize) {
1551 // Small physical memory, so use a minimum fraction of it for the heap
1552 reasonable_max = reasonable_min;
1553 } else {
1554 // Not-small physical memory, so require a heap at least
1555 // as large as MaxHeapSize
1556 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1557 }
1558
1559 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1560 // Limit the heap size to ErgoHeapSizeLimit
1561 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1562 }
1563
1564 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1565
1566 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1567 // An initial heap size was specified on the command line,
1568 // so be sure that the maximum size is consistent. Done
1569 // after call to limit_heap_by_allocatable_memory because that
1570 // method might reduce the allocation size.
1571 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1572 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1573 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1574 }
1575
1576 #ifdef _LP64
1577 if (UseCompressedOops || UseCompressedClassPointers) {
1578 // HeapBaseMinAddress can be greater than default but not less than.
1579 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1580 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1581 // matches compressed oops printing flags
1582 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1583 "(%zuG) which is greater than value given %zu",
1584 DefaultHeapBaseMinAddress,
1585 DefaultHeapBaseMinAddress/G,
1586 HeapBaseMinAddress);
1587 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1588 }
1589 }
1590 }
1591
1592 if (UseCompressedOops) {
1593 size_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1594 size_t max_coop_heap = max_heap_for_compressed_oops();
1595
1596 // Limit the heap size to the maximum possible when using compressed oops
1597 if (heap_end < max_coop_heap) {
1598 // Heap should be above HeapBaseMinAddress to get zero based compressed
1599 // oops but it should be not less than default MaxHeapSize.
1600 max_coop_heap -= HeapBaseMinAddress;
1601 }
1602
1603 // If the user has configured any limit on the amount of RAM we may use,
1604 // then disable compressed oops if the calculated max exceeds max_coop_heap
1605 // and UseCompressedOops was not specified.
1606 if (reasonable_max > max_coop_heap) {
1607 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1608 aot_log_info(aot)("UseCompressedOops disabled due to "
1609 "max heap %zu > compressed oop heap %zu. "
1610 "Please check the setting of MaxRAMPercentage %5.2f.",
1611 reasonable_max, max_coop_heap, MaxRAMPercentage);
1612 FLAG_SET_ERGO(UseCompressedOops, false);
1613 } else {
1614 reasonable_max = max_coop_heap;
1615 }
1616 }
1617 }
1618 #endif // _LP64
1619
1620 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1621 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1622 }
1623
1624 // If the minimum or initial heap_size have not been set or requested to be set
1625 // ergonomically, set them accordingly.
1626 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1627 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1628 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1629 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1630
1631 if (InitialHeapSize == 0) {
1632 uint64_t initial_memory = (uint64_t)(((double)MaxRAM * InitialRAMPercentage) / 100);
1633 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1634 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1635
1636 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1637 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1638
1639 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1640 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1641 }
1642
1643 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1644 // synchronize with InitialHeapSize to avoid errors with the default value.
1645 if (MinHeapSize == 0) {
1646 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1647 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1648 }
1649 }
1650 }
1651
1652 // This option inspects the machine and attempts to set various
1653 // parameters to be optimal for long-running, memory allocation
1654 // intensive jobs. It is intended for machines with large
1655 // amounts of cpu and memory.
1656 jint Arguments::set_aggressive_heap_flags() {
1657 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1658 // VM, but we may not be able to represent the total physical memory
1659 // available (like having 8gb of memory on a box but using a 32bit VM).
1660 // Thus, we need to make sure we're using a julong for intermediate
1661 // calculations.
1662 julong initHeapSize;
1663 physical_memory_size_type phys_mem = os::physical_memory();
1664 julong total_memory = static_cast<julong>(phys_mem);
1665
1666 if (total_memory < (julong) 256 * M) {
1667 jio_fprintf(defaultStream::error_stream(),
1668 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1669 vm_exit(1);
1670 }
1671
1672 // The heap size is half of available memory, or (at most)
1673 // all of possible memory less 160mb (leaving room for the OS
1674 // when using ISM). This is the maximum; because adaptive sizing
1675 // is turned on below, the actual space used may be smaller.
1676
1677 initHeapSize = MIN2(total_memory / (julong) 2,
1678 total_memory - (julong) 160 * M);
1679
1680 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1681
1682 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1683 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1684 return JNI_EINVAL;
1685 }
1686 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1687 return JNI_EINVAL;
1688 }
1689 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1690 return JNI_EINVAL;
1691 }
1692 }
1693 if (FLAG_IS_DEFAULT(NewSize)) {
1694 // Make the young generation 3/8ths of the total heap.
1695 if (FLAG_SET_CMDLINE(NewSize,
1696 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1697 return JNI_EINVAL;
1698 }
1699 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1700 return JNI_EINVAL;
1701 }
1702 }
1703
1704 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1705 FLAG_SET_DEFAULT(UseLargePages, true);
1706 #endif
1707
1708 // Increase some data structure sizes for efficiency
1709 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1710 return JNI_EINVAL;
1711 }
1712 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1713 return JNI_EINVAL;
1714 }
1715
1716 // See the OldPLABSize comment below, but replace 'after promotion'
1717 // with 'after copying'. YoungPLABSize is the size of the survivor
1718 // space per-gc-thread buffers. The default is 4kw.
1719 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1720 return JNI_EINVAL;
1721 }
1722
1723 // OldPLABSize is the size of the buffers in the old gen that
1724 // UseParallelGC uses to promote live data that doesn't fit in the
1725 // survivor spaces. At any given time, there's one for each gc thread.
1726 // The default size is 1kw. These buffers are rarely used, since the
1727 // survivor spaces are usually big enough. For specjbb, however, there
1728 // are occasions when there's lots of live data in the young gen
1729 // and we end up promoting some of it. We don't have a definite
1730 // explanation for why bumping OldPLABSize helps, but the theory
1731 // is that a bigger PLAB results in retaining something like the
1732 // original allocation order after promotion, which improves mutator
1733 // locality. A minor effect may be that larger PLABs reduce the
1734 // number of PLAB allocation events during gc. The value of 8kw
1735 // was arrived at by experimenting with specjbb.
1736 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1737 return JNI_EINVAL;
1738 }
1739
1740 // Enable parallel GC and adaptive generation sizing
1741 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1742 return JNI_EINVAL;
1743 }
1744
1745 // Encourage steady state memory management
1746 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1747 return JNI_EINVAL;
1748 }
1749
1750 return JNI_OK;
1751 }
1752
1753 // This must be called after ergonomics.
1754 void Arguments::set_bytecode_flags() {
1755 if (!RewriteBytecodes) {
1756 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1757 }
1758 }
1759
1760 // Aggressive optimization flags
1761 jint Arguments::set_aggressive_opts_flags() {
1762 #ifdef COMPILER2
1763 if (AggressiveUnboxing) {
1764 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1765 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1766 } else if (!EliminateAutoBox) {
1767 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1768 AggressiveUnboxing = false;
1769 }
1770 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1771 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1772 } else if (!DoEscapeAnalysis) {
1773 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1774 AggressiveUnboxing = false;
1775 }
1776 }
1777 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1778 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1779 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1780 }
1781 // Feed the cache size setting into the JDK
1782 char buffer[1024];
1783 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1784 if (!add_property(buffer)) {
1785 return JNI_ENOMEM;
1786 }
1787 }
1788 #endif
1789
1790 return JNI_OK;
1791 }
1792
1793 //===========================================================================================================
1794
1795 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1796 if (_sun_java_launcher != _default_java_launcher) {
1797 os::free(const_cast<char*>(_sun_java_launcher));
1798 }
1799 _sun_java_launcher = os::strdup_check_oom(launcher);
1800 }
1801
1802 bool Arguments::created_by_java_launcher() {
1803 assert(_sun_java_launcher != nullptr, "property must have value");
1804 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1805 }
1806
1807 bool Arguments::executing_unit_tests() {
1808 return _executing_unit_tests;
1809 }
1810
1811 //===========================================================================================================
1812 // Parsing of main arguments
1813
1814 static unsigned int addreads_count = 0;
1815 static unsigned int addexports_count = 0;
1816 static unsigned int addopens_count = 0;
1817 static unsigned int patch_mod_count = 0;
1818 static unsigned int enable_native_access_count = 0;
1819 static unsigned int enable_final_field_mutation = 0;
1820 static bool patch_mod_javabase = false;
1821
1822 // Check the consistency of vm_init_args
1823 bool Arguments::check_vm_args_consistency() {
1824 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1825 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1826 return false;
1827 }
1828
1829 // Method for adding checks for flag consistency.
1830 // The intent is to warn the user of all possible conflicts,
1831 // before returning an error.
1832 // Note: Needs platform-dependent factoring.
1833 bool status = true;
1834
1835 if (TLABRefillWasteFraction == 0) {
1836 jio_fprintf(defaultStream::error_stream(),
1837 "TLABRefillWasteFraction should be a denominator, "
1838 "not %zu\n",
1839 TLABRefillWasteFraction);
1840 status = false;
1841 }
1842
1843 status = CompilerConfig::check_args_consistency(status);
1844 #if INCLUDE_JVMCI
1845 if (status && EnableJVMCI) {
1846 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1847 // was explicitly set on the command line or in the jimage.
1848 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1849 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1850 return false;
1851 }
1852 }
1853 }
1854 #endif
1855
1856 #if INCLUDE_JFR
1857 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1858 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1859 return false;
1860 }
1861 }
1862 #endif
1863
1864 #ifndef SUPPORT_RESERVED_STACK_AREA
1865 if (StackReservedPages != 0) {
1866 FLAG_SET_CMDLINE(StackReservedPages, 0);
1867 warning("Reserved Stack Area not supported on this platform");
1868 }
1869 #endif
1870
1871 return status;
1872 }
1873
1874 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1875 const char* option_type) {
1876 if (ignore) return false;
1877
1878 const char* spacer = " ";
1879 if (option_type == nullptr) {
1880 option_type = ++spacer; // Set both to the empty string.
1881 }
1882
1883 jio_fprintf(defaultStream::error_stream(),
1884 "Unrecognized %s%soption: %s\n", option_type, spacer,
1885 option->optionString);
1886 return true;
1887 }
1888
1889 static const char* user_assertion_options[] = {
1890 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1891 };
1892
1893 static const char* system_assertion_options[] = {
1894 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1895 };
1896
1897 bool Arguments::parse_uint(const char* value,
1898 uint* uint_arg,
1899 uint min_size) {
1900 uint n;
1901 if (!parse_integer(value, &n)) {
1902 return false;
1903 }
1904 if (n >= min_size) {
1905 *uint_arg = n;
1906 return true;
1907 } else {
1908 return false;
1909 }
1910 }
1911
1912 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1913 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1914 CDSConfig::check_internal_module_property(prop_name, prop_value);
1915 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1916 char* property = AllocateHeap(prop_len, mtArguments);
1917 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1918 if (ret < 0 || ret >= (int)prop_len) {
1919 FreeHeap(property);
1920 return false;
1921 }
1922 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1923 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1924 // that multiple occurrences of the associated flag just causes the existing property value to be
1925 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1926 // to a property after we have finished flag processing.
1927 bool added = add_property(property, WriteableProperty, internal);
1928 FreeHeap(property);
1929 return added;
1930 }
1931
1932 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1933 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1934 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1935 const unsigned int props_count_limit = 1000;
1936 const int max_digits = 3;
1937 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1938
1939 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1940 if (count < props_count_limit) {
1941 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1942 char* property = AllocateHeap(prop_len, mtArguments);
1943 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1944 if (ret < 0 || ret >= (int)prop_len) {
1945 FreeHeap(property);
1946 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1947 return false;
1948 }
1949 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1950 FreeHeap(property);
1951 return added;
1952 }
1953
1954 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1955 return false;
1956 }
1957
1958 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1959 julong* long_arg,
1960 julong min_size,
1961 julong max_size) {
1962 if (!parse_integer(s, long_arg)) return arg_unreadable;
1963 return check_memory_size(*long_arg, min_size, max_size);
1964 }
1965
1966 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1967 // Save default settings for some mode flags
1968 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1969 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1970 Arguments::_ClipInlining = ClipInlining;
1971 Arguments::_BackgroundCompilation = BackgroundCompilation;
1972
1973 // Remember the default value of SharedBaseAddress.
1974 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1975
1976 // Setup flags for mixed which is the default
1977 set_mode_flags(_mixed);
1978
1979 jint result;
1980 for (int i = 0; i < all_args->length(); i++) {
1981 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1982 if (result != JNI_OK) {
1983 return result;
1984 }
1985 }
1986
1987 // Disable CDS for exploded image
1988 if (!has_jimage()) {
1989 no_shared_spaces("CDS disabled on exploded JDK");
1990 }
1991
1992 // We need to ensure processor and memory resources have been properly
1993 // configured - which may rely on arguments we just processed - before
1994 // doing the final argument processing. Any argument processing that
1995 // needs to know about processor and memory resources must occur after
1996 // this point.
1997
1998 os::init_container_support();
1999
2000 SystemMemoryBarrier::initialize();
2001
2002 // Do final processing now that all arguments have been parsed
2003 result = finalize_vm_init_args();
2004 if (result != JNI_OK) {
2005 return result;
2006 }
2007
2008 return JNI_OK;
2009 }
2010
2011 #if !INCLUDE_JVMTI || INCLUDE_CDS
2012 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2013 // represents a valid JDWP agent. is_path==true denotes that we
2014 // are dealing with -agentpath (case where name is a path), otherwise with
2015 // -agentlib
2016 static bool valid_jdwp_agent(char *name, bool is_path) {
2017 char *_name;
2018 const char *_jdwp = "jdwp";
2019 size_t _len_jdwp, _len_prefix;
2020
2021 if (is_path) {
2022 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2023 return false;
2024 }
2025
2026 _name++; // skip past last path separator
2027 _len_prefix = strlen(JNI_LIB_PREFIX);
2028
2029 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2030 return false;
2031 }
2032
2033 _name += _len_prefix;
2034 _len_jdwp = strlen(_jdwp);
2035
2036 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2037 _name += _len_jdwp;
2038 }
2039 else {
2040 return false;
2041 }
2042
2043 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2044 return false;
2045 }
2046
2047 return true;
2048 }
2049
2050 if (strcmp(name, _jdwp) == 0) {
2051 return true;
2052 }
2053
2054 return false;
2055 }
2056 #endif
2057
2058 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2059 // --patch-module=<module>=<file>(<pathsep><file>)*
2060 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2061 // Find the equal sign between the module name and the path specification
2062 const char* module_equal = strchr(patch_mod_tail, '=');
2063 if (module_equal == nullptr) {
2064 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2065 return JNI_ERR;
2066 } else {
2067 // Pick out the module name
2068 size_t module_len = module_equal - patch_mod_tail;
2069 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2070 if (module_name != nullptr) {
2071 memcpy(module_name, patch_mod_tail, module_len);
2072 *(module_name + module_len) = '\0';
2073 // The path piece begins one past the module_equal sign
2074 add_patch_mod_prefix(module_name, module_equal + 1);
2075 FREE_C_HEAP_ARRAY(char, module_name);
2076 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2077 return JNI_ENOMEM;
2078 }
2079 } else {
2080 return JNI_ENOMEM;
2081 }
2082 }
2083 return JNI_OK;
2084 }
2085
2086 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2087 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2088 // The min and max sizes match the values in globals.hpp, but scaled
2089 // with K. The values have been chosen so that alignment with page
2090 // size doesn't change the max value, which makes the conversions
2091 // back and forth between Xss value and ThreadStackSize value easier.
2092 // The values have also been chosen to fit inside a 32-bit signed type.
2093 const julong min_ThreadStackSize = 0;
2094 const julong max_ThreadStackSize = 1 * M;
2095
2096 // Make sure the above values match the range set in globals.hpp
2097 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2098 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2099 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2100
2101 const julong min_size = min_ThreadStackSize * K;
2102 const julong max_size = max_ThreadStackSize * K;
2103
2104 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2105
2106 julong size = 0;
2107 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2108 if (errcode != arg_in_range) {
2109 bool silent = (option == nullptr); // Allow testing to silence error messages
2110 if (!silent) {
2111 jio_fprintf(defaultStream::error_stream(),
2112 "Invalid thread stack size: %s\n", option->optionString);
2113 describe_range_error(errcode);
2114 }
2115 return JNI_EINVAL;
2116 }
2117
2118 // Internally track ThreadStackSize in units of 1024 bytes.
2119 const julong size_aligned = align_up(size, K);
2120 assert(size <= size_aligned,
2121 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2122 size, size_aligned);
2123
2124 const julong size_in_K = size_aligned / K;
2125 assert(size_in_K < (julong)max_intx,
2126 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2127 size_in_K);
2128
2129 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2130 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2131 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2132 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2133 max_expanded, size_in_K);
2134
2135 *out_ThreadStackSize = (intx)size_in_K;
2136
2137 return JNI_OK;
2138 }
2139
2140 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2141 // For match_option to return remaining or value part of option string
2142 const char* tail;
2143
2144 // iterate over arguments
2145 for (int index = 0; index < args->nOptions; index++) {
2146 bool is_absolute_path = false; // for -agentpath vs -agentlib
2147
2148 const JavaVMOption* option = args->options + index;
2149
2150 if (!match_option(option, "-Djava.class.path", &tail) &&
2151 !match_option(option, "-Dsun.java.command", &tail) &&
2152 !match_option(option, "-Dsun.java.launcher", &tail)) {
2153
2154 // add all jvm options to the jvm_args string. This string
2155 // is used later to set the java.vm.args PerfData string constant.
2156 // the -Djava.class.path and the -Dsun.java.command options are
2157 // omitted from jvm_args string as each have their own PerfData
2158 // string constant object.
2159 build_jvm_args(option->optionString);
2160 }
2161
2162 // -verbose:[class/module/gc/jni]
2163 if (match_option(option, "-verbose", &tail)) {
2164 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2165 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2166 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2167 } else if (!strcmp(tail, ":module")) {
2168 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2169 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2170 } else if (!strcmp(tail, ":gc")) {
2171 if (_legacyGCLogging.lastFlag == 0) {
2172 _legacyGCLogging.lastFlag = 1;
2173 }
2174 } else if (!strcmp(tail, ":jni")) {
2175 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2176 }
2177 // -da / -ea / -disableassertions / -enableassertions
2178 // These accept an optional class/package name separated by a colon, e.g.,
2179 // -da:java.lang.Thread.
2180 } else if (match_option(option, user_assertion_options, &tail, true)) {
2181 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2182 if (*tail == '\0') {
2183 JavaAssertions::setUserClassDefault(enable);
2184 } else {
2185 assert(*tail == ':', "bogus match by match_option()");
2186 JavaAssertions::addOption(tail + 1, enable);
2187 }
2188 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2189 } else if (match_option(option, system_assertion_options, &tail, false)) {
2190 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2191 JavaAssertions::setSystemClassDefault(enable);
2192 // -bootclasspath:
2193 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2194 jio_fprintf(defaultStream::output_stream(),
2195 "-Xbootclasspath is no longer a supported option.\n");
2196 return JNI_EINVAL;
2197 // -bootclasspath/a:
2198 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2199 Arguments::append_sysclasspath(tail);
2200 // -bootclasspath/p:
2201 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2202 jio_fprintf(defaultStream::output_stream(),
2203 "-Xbootclasspath/p is no longer a supported option.\n");
2204 return JNI_EINVAL;
2205 // -Xrun
2206 } else if (match_option(option, "-Xrun", &tail)) {
2207 if (tail != nullptr) {
2208 const char* pos = strchr(tail, ':');
2209 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2210 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2211 jio_snprintf(name, len + 1, "%s", tail);
2212
2213 char *options = nullptr;
2214 if(pos != nullptr) {
2215 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2216 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2217 }
2218 #if !INCLUDE_JVMTI
2219 if (strcmp(name, "jdwp") == 0) {
2220 jio_fprintf(defaultStream::error_stream(),
2221 "Debugging agents are not supported in this VM\n");
2222 return JNI_ERR;
2223 }
2224 #endif // !INCLUDE_JVMTI
2225 JvmtiAgentList::add_xrun(name, options, false);
2226 FREE_C_HEAP_ARRAY(char, name);
2227 FREE_C_HEAP_ARRAY(char, options);
2228 }
2229 } else if (match_option(option, "--add-reads=", &tail)) {
2230 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2231 return JNI_ENOMEM;
2232 }
2233 } else if (match_option(option, "--add-exports=", &tail)) {
2234 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2235 return JNI_ENOMEM;
2236 }
2237 } else if (match_option(option, "--add-opens=", &tail)) {
2238 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2239 return JNI_ENOMEM;
2240 }
2241 } else if (match_option(option, "--add-modules=", &tail)) {
2242 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2243 return JNI_ENOMEM;
2244 }
2245 #if INCLUDE_JVMCI
2246 if (!_jvmci_module_added) {
2247 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2248 if (jvmci_module != nullptr) {
2249 char before = *(jvmci_module - 1);
2250 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2251 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2252 FLAG_SET_DEFAULT(EnableJVMCI, true);
2253 _jvmci_module_added = true;
2254 }
2255 }
2256 }
2257 #endif
2258 } else if (match_option(option, "--enable-native-access=", &tail)) {
2259 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2260 return JNI_ENOMEM;
2261 }
2262 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2263 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2264 return JNI_ENOMEM;
2265 }
2266 } else if (match_option(option, "--limit-modules=", &tail)) {
2267 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2268 return JNI_ENOMEM;
2269 }
2270 } else if (match_option(option, "--module-path=", &tail)) {
2271 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2272 return JNI_ENOMEM;
2273 }
2274 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2275 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2276 return JNI_ENOMEM;
2277 }
2278 } else if (match_option(option, "--patch-module=", &tail)) {
2279 // --patch-module=<module>=<file>(<pathsep><file>)*
2280 int res = process_patch_mod_option(tail);
2281 if (res != JNI_OK) {
2282 return res;
2283 }
2284 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2285 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2286 return JNI_ENOMEM;
2287 }
2288 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2289 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2290 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2291 AddProperty, WriteableProperty, InternalProperty);
2292 } else {
2293 jio_fprintf(defaultStream::error_stream(),
2294 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2295 return JNI_ERR;
2296 }
2297 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2298 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2299 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2300 AddProperty, WriteableProperty, InternalProperty);
2301 } else {
2302 jio_fprintf(defaultStream::error_stream(),
2303 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2304 return JNI_ERR;
2305 }
2306 } else if (match_option(option, "--illegal-access=", &tail)) {
2307 char version[256];
2308 JDK_Version::jdk(17).to_string(version, sizeof(version));
2309 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2310 // -agentlib and -agentpath
2311 } else if (match_option(option, "-agentlib:", &tail) ||
2312 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2313 if(tail != nullptr) {
2314 const char* pos = strchr(tail, '=');
2315 char* name;
2316 if (pos == nullptr) {
2317 name = os::strdup_check_oom(tail, mtArguments);
2318 } else {
2319 size_t len = pos - tail;
2320 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2321 memcpy(name, tail, len);
2322 name[len] = '\0';
2323 }
2324
2325 char *options = nullptr;
2326 if(pos != nullptr) {
2327 options = os::strdup_check_oom(pos + 1, mtArguments);
2328 }
2329 #if !INCLUDE_JVMTI
2330 if (valid_jdwp_agent(name, is_absolute_path)) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "Debugging agents are not supported in this VM\n");
2333 return JNI_ERR;
2334 }
2335 #elif INCLUDE_CDS
2336 if (valid_jdwp_agent(name, is_absolute_path)) {
2337 _has_jdwp_agent = true;
2338 }
2339 #endif // !INCLUDE_JVMTI
2340 JvmtiAgentList::add(name, options, is_absolute_path);
2341 os::free(name);
2342 os::free(options);
2343 }
2344 // -javaagent
2345 } else if (match_option(option, "-javaagent:", &tail)) {
2346 #if !INCLUDE_JVMTI
2347 jio_fprintf(defaultStream::error_stream(),
2348 "Instrumentation agents are not supported in this VM\n");
2349 return JNI_ERR;
2350 #else
2351 if (tail != nullptr) {
2352 size_t length = strlen(tail) + 1;
2353 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2354 jio_snprintf(options, length, "%s", tail);
2355 JvmtiAgentList::add("instrument", options, false);
2356 FREE_C_HEAP_ARRAY(char, options);
2357
2358 // java agents need module java.instrument
2359 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2360 return JNI_ENOMEM;
2361 }
2362 }
2363 #endif // !INCLUDE_JVMTI
2364 // --enable_preview
2365 } else if (match_option(option, "--enable-preview")) {
2366 set_enable_preview();
2367 // -Xnoclassgc
2368 } else if (match_option(option, "-Xnoclassgc")) {
2369 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2370 return JNI_EINVAL;
2371 }
2372 // -Xbatch
2373 } else if (match_option(option, "-Xbatch")) {
2374 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2375 return JNI_EINVAL;
2376 }
2377 // -Xmn for compatibility with other JVM vendors
2378 } else if (match_option(option, "-Xmn", &tail)) {
2379 julong long_initial_young_size = 0;
2380 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2381 if (errcode != arg_in_range) {
2382 jio_fprintf(defaultStream::error_stream(),
2383 "Invalid initial young generation size: %s\n", option->optionString);
2384 describe_range_error(errcode);
2385 return JNI_EINVAL;
2386 }
2387 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2388 return JNI_EINVAL;
2389 }
2390 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2391 return JNI_EINVAL;
2392 }
2393 // -Xms
2394 } else if (match_option(option, "-Xms", &tail)) {
2395 julong size = 0;
2396 // an initial heap size of 0 means automatically determine
2397 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2398 if (errcode != arg_in_range) {
2399 jio_fprintf(defaultStream::error_stream(),
2400 "Invalid initial heap size: %s\n", option->optionString);
2401 describe_range_error(errcode);
2402 return JNI_EINVAL;
2403 }
2404 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2405 return JNI_EINVAL;
2406 }
2407 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2408 return JNI_EINVAL;
2409 }
2410 // -Xmx
2411 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2412 julong long_max_heap_size = 0;
2413 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2414 if (errcode != arg_in_range) {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "Invalid maximum heap size: %s\n", option->optionString);
2417 describe_range_error(errcode);
2418 return JNI_EINVAL;
2419 }
2420 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 // Xmaxf
2424 } else if (match_option(option, "-Xmaxf", &tail)) {
2425 char* err;
2426 double dmaxf = strtod(tail, &err);
2427 if (*err != '\0' || *tail == '\0') {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Bad max heap free ratio: %s\n",
2430 option->optionString);
2431 return JNI_EINVAL;
2432 }
2433 if (dmaxf < 0.0 || dmaxf > 1.0) {
2434 jio_fprintf(defaultStream::error_stream(),
2435 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2436 option->optionString);
2437 return JNI_EINVAL;
2438 }
2439 const uintx umaxf = (uintx)(dmaxf * 100);
2440 if (MinHeapFreeRatio > umaxf) {
2441 jio_fprintf(defaultStream::error_stream(),
2442 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2443 tail, MinHeapFreeRatio / 100.0f);
2444 return JNI_EINVAL;
2445 }
2446 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2447 return JNI_EINVAL;
2448 }
2449 // Xminf
2450 } else if (match_option(option, "-Xminf", &tail)) {
2451 char* err;
2452 double dminf = strtod(tail, &err);
2453 if (*err != '\0' || *tail == '\0') {
2454 jio_fprintf(defaultStream::error_stream(),
2455 "Bad min heap free ratio: %s\n",
2456 option->optionString);
2457 return JNI_EINVAL;
2458 }
2459 if (dminf < 0.0 || dminf > 1.0) {
2460 jio_fprintf(defaultStream::error_stream(),
2461 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2462 tail);
2463 return JNI_EINVAL;
2464 }
2465 const uintx uminf = (uintx)(dminf * 100);
2466 if (MaxHeapFreeRatio < uminf) {
2467 jio_fprintf(defaultStream::error_stream(),
2468 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2469 tail, MaxHeapFreeRatio / 100.0f);
2470 return JNI_EINVAL;
2471 }
2472 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2473 return JNI_EINVAL;
2474 }
2475 // -Xss
2476 } else if (match_option(option, "-Xss", &tail)) {
2477 intx value = 0;
2478 jint err = parse_xss(option, tail, &value);
2479 if (err != JNI_OK) {
2480 return err;
2481 }
2482 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2483 return JNI_EINVAL;
2484 }
2485 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2486 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2487 if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2488 warning("Option -Xmaxjitcodesize was deprecated in JDK 26 and will likely be removed in a future release.");
2489 }
2490 julong long_ReservedCodeCacheSize = 0;
2491
2492 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2493 if (errcode != arg_in_range) {
2494 jio_fprintf(defaultStream::error_stream(),
2495 "Invalid maximum code cache size: %s.\n", option->optionString);
2496 return JNI_EINVAL;
2497 }
2498 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2499 return JNI_EINVAL;
2500 }
2501 // -green
2502 } else if (match_option(option, "-green")) {
2503 jio_fprintf(defaultStream::error_stream(),
2504 "Green threads support not available\n");
2505 return JNI_EINVAL;
2506 // -native
2507 } else if (match_option(option, "-native")) {
2508 // HotSpot always uses native threads, ignore silently for compatibility
2509 // -Xrs
2510 } else if (match_option(option, "-Xrs")) {
2511 // Classic/EVM option, new functionality
2512 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2513 return JNI_EINVAL;
2514 }
2515 // -Xprof
2516 } else if (match_option(option, "-Xprof")) {
2517 char version[256];
2518 // Obsolete in JDK 10
2519 JDK_Version::jdk(10).to_string(version, sizeof(version));
2520 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2521 // -Xinternalversion
2522 } else if (match_option(option, "-Xinternalversion")) {
2523 jio_fprintf(defaultStream::output_stream(), "%s\n",
2524 VM_Version::internal_vm_info_string());
2525 vm_exit(0);
2526 #ifndef PRODUCT
2527 // -Xprintflags
2528 } else if (match_option(option, "-Xprintflags")) {
2529 JVMFlag::printFlags(tty, false);
2530 vm_exit(0);
2531 #endif
2532 // -D
2533 } else if (match_option(option, "-D", &tail)) {
2534 const char* value;
2535 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2536 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2537 // abort if -Djava.endorsed.dirs is set
2538 jio_fprintf(defaultStream::output_stream(),
2539 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2540 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2541 return JNI_EINVAL;
2542 }
2543 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2544 *value != '\0' && strcmp(value, "\"\"") != 0) {
2545 // abort if -Djava.ext.dirs is set
2546 jio_fprintf(defaultStream::output_stream(),
2547 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2548 return JNI_EINVAL;
2549 }
2550 // Check for module related properties. They must be set using the modules
2551 // options. For example: use "--add-modules=java.sql", not
2552 // "-Djdk.module.addmods=java.sql"
2553 if (is_internal_module_property(option->optionString + 2)) {
2554 needs_module_property_warning = true;
2555 continue;
2556 }
2557 if (!add_property(tail)) {
2558 return JNI_ENOMEM;
2559 }
2560 // Out of the box management support
2561 if (match_option(option, "-Dcom.sun.management", &tail)) {
2562 #if INCLUDE_MANAGEMENT
2563 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2564 return JNI_EINVAL;
2565 }
2566 // management agent in module jdk.management.agent
2567 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2568 return JNI_ENOMEM;
2569 }
2570 #else
2571 jio_fprintf(defaultStream::output_stream(),
2572 "-Dcom.sun.management is not supported in this VM.\n");
2573 return JNI_ERR;
2574 #endif
2575 }
2576 // -Xint
2577 } else if (match_option(option, "-Xint")) {
2578 set_mode_flags(_int);
2579 mode_flag_cmd_line = true;
2580 // -Xmixed
2581 } else if (match_option(option, "-Xmixed")) {
2582 set_mode_flags(_mixed);
2583 mode_flag_cmd_line = true;
2584 // -Xcomp
2585 } else if (match_option(option, "-Xcomp")) {
2586 // for testing the compiler; turn off all flags that inhibit compilation
2587 set_mode_flags(_comp);
2588 mode_flag_cmd_line = true;
2589 // -Xshare:dump
2590 } else if (match_option(option, "-Xshare:dump")) {
2591 CDSConfig::enable_dumping_static_archive();
2592 CDSConfig::set_old_cds_flags_used();
2593 // -Xshare:on
2594 } else if (match_option(option, "-Xshare:on")) {
2595 UseSharedSpaces = true;
2596 RequireSharedSpaces = true;
2597 CDSConfig::set_old_cds_flags_used();
2598 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2599 } else if (match_option(option, "-Xshare:auto")) {
2600 UseSharedSpaces = true;
2601 RequireSharedSpaces = false;
2602 xshare_auto_cmd_line = true;
2603 CDSConfig::set_old_cds_flags_used();
2604 // -Xshare:off
2605 } else if (match_option(option, "-Xshare:off")) {
2606 UseSharedSpaces = false;
2607 RequireSharedSpaces = false;
2608 CDSConfig::set_old_cds_flags_used();
2609 // -Xverify
2610 } else if (match_option(option, "-Xverify", &tail)) {
2611 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2612 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2613 return JNI_EINVAL;
2614 }
2615 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2616 return JNI_EINVAL;
2617 }
2618 } else if (strcmp(tail, ":remote") == 0) {
2619 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2620 return JNI_EINVAL;
2621 }
2622 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2623 return JNI_EINVAL;
2624 }
2625 } else if (strcmp(tail, ":none") == 0) {
2626 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2627 return JNI_EINVAL;
2628 }
2629 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2630 return JNI_EINVAL;
2631 }
2632 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2633 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2634 return JNI_EINVAL;
2635 }
2636 // -Xdebug
2637 } else if (match_option(option, "-Xdebug")) {
2638 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2639 } else if (match_option(option, "-Xloggc:", &tail)) {
2640 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2641 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2642 _legacyGCLogging.lastFlag = 2;
2643 _legacyGCLogging.file = os::strdup_check_oom(tail);
2644 } else if (match_option(option, "-Xlog", &tail)) {
2645 bool ret = false;
2646 if (strcmp(tail, ":help") == 0) {
2647 fileStream stream(defaultStream::output_stream());
2648 LogConfiguration::print_command_line_help(&stream);
2649 vm_exit(0);
2650 } else if (strcmp(tail, ":disable") == 0) {
2651 LogConfiguration::disable_logging();
2652 ret = true;
2653 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2654 const char* async_tail = tail + strlen(":async");
2655 ret = LogConfiguration::parse_async_argument(async_tail);
2656 } else if (*tail == '\0') {
2657 ret = LogConfiguration::parse_command_line_arguments();
2658 assert(ret, "-Xlog without arguments should never fail to parse");
2659 } else if (*tail == ':') {
2660 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2661 }
2662 if (ret == false) {
2663 jio_fprintf(defaultStream::error_stream(),
2664 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2665 tail);
2666 return JNI_EINVAL;
2667 }
2668 // JNI hooks
2669 } else if (match_option(option, "-Xcheck", &tail)) {
2670 if (!strcmp(tail, ":jni")) {
2671 #if !INCLUDE_JNI_CHECK
2672 warning("JNI CHECKING is not supported in this VM");
2673 #else
2674 CheckJNICalls = true;
2675 #endif // INCLUDE_JNI_CHECK
2676 } else if (is_bad_option(option, args->ignoreUnrecognized,
2677 "check")) {
2678 return JNI_EINVAL;
2679 }
2680 } else if (match_option(option, "vfprintf")) {
2681 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2682 } else if (match_option(option, "exit")) {
2683 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2684 } else if (match_option(option, "abort")) {
2685 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2686 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2687 // and the last option wins.
2688 } else if (match_option(option, "-XX:+NeverTenure")) {
2689 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2699 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2700 return JNI_EINVAL;
2701 }
2702 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2703 return JNI_EINVAL;
2704 }
2705 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2709 uint max_tenuring_thresh = 0;
2710 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2711 jio_fprintf(defaultStream::error_stream(),
2712 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2713 return JNI_EINVAL;
2714 }
2715
2716 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2717 return JNI_EINVAL;
2718 }
2719
2720 if (MaxTenuringThreshold == 0) {
2721 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2722 return JNI_EINVAL;
2723 }
2724 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 } else {
2728 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2729 return JNI_EINVAL;
2730 }
2731 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734 }
2735 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2736 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2743 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2750 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2751 return JNI_EINVAL;
2752 }
2753 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2757 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 } else if (match_option(option, "--finalization=", &tail)) {
2764 if (strcmp(tail, "enabled") == 0) {
2765 InstanceKlass::set_finalization_enabled(true);
2766 } else if (strcmp(tail, "disabled") == 0) {
2767 InstanceKlass::set_finalization_enabled(false);
2768 } else {
2769 jio_fprintf(defaultStream::error_stream(),
2770 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2771 tail);
2772 return JNI_EINVAL;
2773 }
2774 #if !defined(DTRACE_ENABLED)
2775 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "DTraceMethodProbes flag is not applicable for this configuration\n");
2778 return JNI_EINVAL;
2779 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2780 jio_fprintf(defaultStream::error_stream(),
2781 "DTraceAllocProbes flag is not applicable for this configuration\n");
2782 return JNI_EINVAL;
2783 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2784 jio_fprintf(defaultStream::error_stream(),
2785 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2786 return JNI_EINVAL;
2787 #endif // !defined(DTRACE_ENABLED)
2788 #ifdef ASSERT
2789 } else if (match_option(option, "-XX:+FullGCALot")) {
2790 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 #endif
2794 #if !INCLUDE_MANAGEMENT
2795 } else if (match_option(option, "-XX:+ManagementServer")) {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "ManagementServer is not supported in this VM.\n");
2798 return JNI_ERR;
2799 #endif // INCLUDE_MANAGEMENT
2800 #if INCLUDE_JVMCI
2801 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2802 if (EnableJVMCIProduct) {
2803 jio_fprintf(defaultStream::error_stream(),
2804 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2805 return JNI_EINVAL;
2806 }
2807 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2808 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2809 if (use_graal_jit) {
2810 const char* jvmci_compiler = get_property("jvmci.Compiler");
2811 if (jvmci_compiler != nullptr) {
2812 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2815 return JNI_ERR;
2816 }
2817 } else if (!add_property("jvmci.Compiler=graal")) {
2818 return JNI_ENOMEM;
2819 }
2820 }
2821
2822 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2823 if (EnableJVMCIProduct) {
2824 continue;
2825 }
2826 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2827 // Allow this flag if it has been unlocked.
2828 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2829 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2830 jio_fprintf(defaultStream::error_stream(),
2831 "Unable to enable JVMCI in product mode\n");
2832 return JNI_ERR;
2833 }
2834 }
2835 // The flag was locked so process normally to report that error
2836 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2837 return JNI_EINVAL;
2838 }
2839 #endif // INCLUDE_JVMCI
2840 #if INCLUDE_JFR
2841 } else if (match_jfr_option(&option)) {
2842 return JNI_EINVAL;
2843 #endif
2844 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2845 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2846 // already been handled
2847 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2848 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2849 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2850 return JNI_EINVAL;
2851 }
2852 }
2853 // Unknown option
2854 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2855 return JNI_ERR;
2856 }
2857 }
2858
2859 // PrintSharedArchiveAndExit will turn on
2860 // -Xshare:on
2861 // -Xlog:class+path=info
2862 if (PrintSharedArchiveAndExit) {
2863 UseSharedSpaces = true;
2864 RequireSharedSpaces = true;
2865 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2866 }
2867
2868 fix_appclasspath();
2869
2870 return JNI_OK;
2871 }
2872
2873 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2874 // For java.base check for duplicate --patch-module options being specified on the command line.
2875 // This check is only required for java.base, all other duplicate module specifications
2876 // will be checked during module system initialization. The module system initialization
2877 // will throw an ExceptionInInitializerError if this situation occurs.
2878 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2879 if (patch_mod_javabase) {
2880 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2881 } else {
2882 patch_mod_javabase = true;
2883 }
2884 }
2885
2886 // Create GrowableArray lazily, only if --patch-module has been specified
2887 if (_patch_mod_prefix == nullptr) {
2888 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2889 }
2890
2891 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2892 }
2893
2894 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2895 //
2896 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2897 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2898 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2899 // path is treated as the current directory.
2900 //
2901 // This causes problems with CDS, which requires that all directories specified in the classpath
2902 // must be empty. In most cases, applications do NOT want to load classes from the current
2903 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2904 // scripts compatible with CDS.
2905 void Arguments::fix_appclasspath() {
2906 if (IgnoreEmptyClassPaths) {
2907 const char separator = *os::path_separator();
2908 const char* src = _java_class_path->value();
2909
2910 // skip over all the leading empty paths
2911 while (*src == separator) {
2912 src ++;
2913 }
2914
2915 char* copy = os::strdup_check_oom(src, mtArguments);
2916
2917 // trim all trailing empty paths
2918 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2919 *tail = '\0';
2920 }
2921
2922 char from[3] = {separator, separator, '\0'};
2923 char to [2] = {separator, '\0'};
2924 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2925 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2926 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2927 }
2928
2929 _java_class_path->set_writeable_value(copy);
2930 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2931 }
2932 }
2933
2934 jint Arguments::finalize_vm_init_args() {
2935 // check if the default lib/endorsed directory exists; if so, error
2936 char path[JVM_MAXPATHLEN];
2937 const char* fileSep = os::file_separator();
2938 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2939
2940 DIR* dir = os::opendir(path);
2941 if (dir != nullptr) {
2942 jio_fprintf(defaultStream::output_stream(),
2943 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2944 "in modular form will be supported via the concept of upgradeable modules.\n");
2945 os::closedir(dir);
2946 return JNI_ERR;
2947 }
2948
2949 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2950 dir = os::opendir(path);
2951 if (dir != nullptr) {
2952 jio_fprintf(defaultStream::output_stream(),
2953 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2954 "Use -classpath instead.\n.");
2955 os::closedir(dir);
2956 return JNI_ERR;
2957 }
2958
2959 // This must be done after all arguments have been processed
2960 // and the container support has been initialized since AggressiveHeap
2961 // relies on the amount of total memory available.
2962 if (AggressiveHeap) {
2963 jint result = set_aggressive_heap_flags();
2964 if (result != JNI_OK) {
2965 return result;
2966 }
2967 }
2968
2969 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2970 // but like -Xint, leave compilation thresholds unaffected.
2971 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2972 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2973 set_mode_flags(_int);
2974 }
2975
2976 #ifdef ZERO
2977 // Zero always runs in interpreted mode
2978 set_mode_flags(_int);
2979 #endif
2980
2981 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2982 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2983 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2984 }
2985
2986 #if !COMPILER2_OR_JVMCI
2987 // Don't degrade server performance for footprint
2988 if (FLAG_IS_DEFAULT(UseLargePages) &&
2989 MaxHeapSize < LargePageHeapSizeThreshold) {
2990 // No need for large granularity pages w/small heaps.
2991 // Note that large pages are enabled/disabled for both the
2992 // Java heap and the code cache.
2993 FLAG_SET_DEFAULT(UseLargePages, false);
2994 }
2995
2996 UNSUPPORTED_OPTION(ProfileInterpreter);
2997 #endif
2998
2999 // Parse the CompilationMode flag
3000 if (!CompilationModeFlag::initialize()) {
3001 return JNI_ERR;
3002 }
3003
3004 if (!check_vm_args_consistency()) {
3005 return JNI_ERR;
3006 }
3007
3008
3009 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3010 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3011 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3012
3013 return JNI_OK;
3014 }
3015
3016 // Helper class for controlling the lifetime of JavaVMInitArgs
3017 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3018 // deleted on the destruction of the ScopedVMInitArgs object.
3019 class ScopedVMInitArgs : public StackObj {
3020 private:
3021 JavaVMInitArgs _args;
3022 char* _container_name;
3023 bool _is_set;
3024 char* _vm_options_file_arg;
3025
3026 public:
3027 ScopedVMInitArgs(const char *container_name) {
3028 _args.version = JNI_VERSION_1_2;
3029 _args.nOptions = 0;
3030 _args.options = nullptr;
3031 _args.ignoreUnrecognized = false;
3032 _container_name = (char *)container_name;
3033 _is_set = false;
3034 _vm_options_file_arg = nullptr;
3035 }
3036
3037 // Populates the JavaVMInitArgs object represented by this
3038 // ScopedVMInitArgs object with the arguments in options. The
3039 // allocated memory is deleted by the destructor. If this method
3040 // returns anything other than JNI_OK, then this object is in a
3041 // partially constructed state, and should be abandoned.
3042 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3043 _is_set = true;
3044 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3045 JavaVMOption, options->length(), mtArguments);
3046 if (options_arr == nullptr) {
3047 return JNI_ENOMEM;
3048 }
3049 _args.options = options_arr;
3050
3051 for (int i = 0; i < options->length(); i++) {
3052 options_arr[i] = options->at(i);
3053 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3054 if (options_arr[i].optionString == nullptr) {
3055 // Rely on the destructor to do cleanup.
3056 _args.nOptions = i;
3057 return JNI_ENOMEM;
3058 }
3059 }
3060
3061 _args.nOptions = options->length();
3062 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3063 return JNI_OK;
3064 }
3065
3066 JavaVMInitArgs* get() { return &_args; }
3067 char* container_name() { return _container_name; }
3068 bool is_set() { return _is_set; }
3069 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3070 char* vm_options_file_arg() { return _vm_options_file_arg; }
3071
3072 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3073 if (_vm_options_file_arg != nullptr) {
3074 os::free(_vm_options_file_arg);
3075 }
3076 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3077 }
3078
3079 ~ScopedVMInitArgs() {
3080 if (_vm_options_file_arg != nullptr) {
3081 os::free(_vm_options_file_arg);
3082 }
3083 if (_args.options == nullptr) return;
3084 for (int i = 0; i < _args.nOptions; i++) {
3085 os::free(_args.options[i].optionString);
3086 }
3087 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3088 }
3089
3090 // Insert options into this option list, to replace option at
3091 // vm_options_file_pos (-XX:VMOptionsFile)
3092 jint insert(const JavaVMInitArgs* args,
3093 const JavaVMInitArgs* args_to_insert,
3094 const int vm_options_file_pos) {
3095 assert(_args.options == nullptr, "shouldn't be set yet");
3096 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3097 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3098
3099 int length = args->nOptions + args_to_insert->nOptions - 1;
3100 // Construct new option array
3101 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3102 for (int i = 0; i < args->nOptions; i++) {
3103 if (i == vm_options_file_pos) {
3104 // insert the new options starting at the same place as the
3105 // -XX:VMOptionsFile option
3106 for (int j = 0; j < args_to_insert->nOptions; j++) {
3107 options.push(args_to_insert->options[j]);
3108 }
3109 } else {
3110 options.push(args->options[i]);
3111 }
3112 }
3113 // make into options array
3114 return set_args(&options);
3115 }
3116 };
3117
3118 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3119 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3120 }
3121
3122 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3123 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3124 }
3125
3126 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3127 for (int index = args->nOptions - 1; index >= 0; index--) {
3128 JavaVMOption* option = args->options + index;
3129 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3130 return option;
3131 }
3132 }
3133
3134 return nullptr;
3135 }
3136
3137 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3138 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3139 // Don't bother scanning all the args if this env variable is not set
3140 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3141 return JNI_OK;
3142 }
3143
3144 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3145 // of AOTMode.
3146 JavaVMOption* option = nullptr;
3147 for (int i = all_args->length() - 1; i >= 0; i--) {
3148 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3149 break;
3150 }
3151 }
3152
3153 if (option != nullptr) {
3154 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3155 // so its value is not reflected inside the global variable AOTMode.
3156 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3157 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3158 }
3159 } else {
3160 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3161 // which would have been set inside process_settings_file();
3162 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3163 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3164 }
3165 }
3166
3167 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3168 }
3169
3170 jint Arguments::parse_options_environment_variable(const char* name,
3171 ScopedVMInitArgs* vm_args) {
3172 char *buffer = ::getenv(name);
3173
3174 // Don't check this environment variable if user has special privileges
3175 // (e.g. unix su command).
3176 if (buffer == nullptr || os::have_special_privileges()) {
3177 return JNI_OK;
3178 }
3179
3180 if ((buffer = os::strdup(buffer)) == nullptr) {
3181 return JNI_ENOMEM;
3182 }
3183
3184 jio_fprintf(defaultStream::error_stream(),
3185 "Picked up %s: %s\n", name, buffer);
3186
3187 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3188
3189 os::free(buffer);
3190 return retcode;
3191 }
3192
3193 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3194 // read file into buffer
3195 int fd = ::open(file_name, O_RDONLY);
3196 if (fd < 0) {
3197 jio_fprintf(defaultStream::error_stream(),
3198 "Could not open options file '%s'\n",
3199 file_name);
3200 return JNI_ERR;
3201 }
3202
3203 struct stat stbuf;
3204 int retcode = os::stat(file_name, &stbuf);
3205 if (retcode != 0) {
3206 jio_fprintf(defaultStream::error_stream(),
3207 "Could not stat options file '%s'\n",
3208 file_name);
3209 ::close(fd);
3210 return JNI_ERR;
3211 }
3212
3213 if (stbuf.st_size == 0) {
3214 // tell caller there is no option data and that is ok
3215 ::close(fd);
3216 return JNI_OK;
3217 }
3218
3219 // '+ 1' for null termination even with max bytes
3220 size_t bytes_alloc = stbuf.st_size + 1;
3221
3222 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3223 if (nullptr == buf) {
3224 jio_fprintf(defaultStream::error_stream(),
3225 "Could not allocate read buffer for options file parse\n");
3226 ::close(fd);
3227 return JNI_ENOMEM;
3228 }
3229
3230 memset(buf, 0, bytes_alloc);
3231
3232 // Fill buffer
3233 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3234 ::close(fd);
3235 if (bytes_read < 0) {
3236 FREE_C_HEAP_ARRAY(char, buf);
3237 jio_fprintf(defaultStream::error_stream(),
3238 "Could not read options file '%s'\n", file_name);
3239 return JNI_ERR;
3240 }
3241
3242 if (bytes_read == 0) {
3243 // tell caller there is no option data and that is ok
3244 FREE_C_HEAP_ARRAY(char, buf);
3245 return JNI_OK;
3246 }
3247
3248 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3249
3250 FREE_C_HEAP_ARRAY(char, buf);
3251 return retcode;
3252 }
3253
3254 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3255 // Construct option array
3256 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3257
3258 // some pointers to help with parsing
3259 char *buffer_end = buffer + buf_len;
3260 char *opt_hd = buffer;
3261 char *wrt = buffer;
3262 char *rd = buffer;
3263
3264 // parse all options
3265 while (rd < buffer_end) {
3266 // skip leading white space from the input string
3267 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3268 rd++;
3269 }
3270
3271 if (rd >= buffer_end) {
3272 break;
3273 }
3274
3275 // Remember this is where we found the head of the token.
3276 opt_hd = wrt;
3277
3278 // Tokens are strings of non white space characters separated
3279 // by one or more white spaces.
3280 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3281 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3282 int quote = *rd; // matching quote to look for
3283 rd++; // don't copy open quote
3284 while (rd < buffer_end && *rd != quote) {
3285 // include everything (even spaces)
3286 // up until the close quote
3287 *wrt++ = *rd++; // copy to option string
3288 }
3289
3290 if (rd < buffer_end) {
3291 rd++; // don't copy close quote
3292 } else {
3293 // did not see closing quote
3294 jio_fprintf(defaultStream::error_stream(),
3295 "Unmatched quote in %s\n", name);
3296 return JNI_ERR;
3297 }
3298 } else {
3299 *wrt++ = *rd++; // copy to option string
3300 }
3301 }
3302
3303 // steal a white space character and set it to null
3304 *wrt++ = '\0';
3305 // We now have a complete token
3306
3307 JavaVMOption option;
3308 option.optionString = opt_hd;
3309 option.extraInfo = nullptr;
3310
3311 options.append(option); // Fill in option
3312
3313 rd++; // Advance to next character
3314 }
3315
3316 // Fill out JavaVMInitArgs structure.
3317 return vm_args->set_args(&options);
3318 }
3319
3320 #ifndef PRODUCT
3321 // Determine whether LogVMOutput should be implicitly turned on.
3322 static bool use_vm_log() {
3323 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3324 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3325 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3326 PrintAssembly || TraceDeoptimization ||
3327 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3328 return true;
3329 }
3330
3331 #ifdef COMPILER1
3332 if (PrintC1Statistics) {
3333 return true;
3334 }
3335 #endif // COMPILER1
3336
3337 #ifdef COMPILER2
3338 if (PrintOptoAssembly || PrintOptoStatistics) {
3339 return true;
3340 }
3341 #endif // COMPILER2
3342
3343 return false;
3344 }
3345
3346 #endif // PRODUCT
3347
3348 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3349 for (int index = 0; index < args->nOptions; index++) {
3350 const JavaVMOption* option = args->options + index;
3351 const char* tail;
3352 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3353 return true;
3354 }
3355 }
3356 return false;
3357 }
3358
3359 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3360 const char* vm_options_file,
3361 const int vm_options_file_pos,
3362 ScopedVMInitArgs* vm_options_file_args,
3363 ScopedVMInitArgs* args_out) {
3364 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3365 if (code != JNI_OK) {
3366 return code;
3367 }
3368
3369 if (vm_options_file_args->get()->nOptions < 1) {
3370 return JNI_OK;
3371 }
3372
3373 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3374 jio_fprintf(defaultStream::error_stream(),
3375 "A VM options file may not refer to a VM options file. "
3376 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3377 "options file '%s' in options container '%s' is an error.\n",
3378 vm_options_file_args->vm_options_file_arg(),
3379 vm_options_file_args->container_name());
3380 return JNI_EINVAL;
3381 }
3382
3383 return args_out->insert(args, vm_options_file_args->get(),
3384 vm_options_file_pos);
3385 }
3386
3387 // Expand -XX:VMOptionsFile found in args_in as needed.
3388 // mod_args and args_out parameters may return values as needed.
3389 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3390 ScopedVMInitArgs* mod_args,
3391 JavaVMInitArgs** args_out) {
3392 jint code = match_special_option_and_act(args_in, mod_args);
3393 if (code != JNI_OK) {
3394 return code;
3395 }
3396
3397 if (mod_args->is_set()) {
3398 // args_in contains -XX:VMOptionsFile and mod_args contains the
3399 // original options from args_in along with the options expanded
3400 // from the VMOptionsFile. Return a short-hand to the caller.
3401 *args_out = mod_args->get();
3402 } else {
3403 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3404 }
3405 return JNI_OK;
3406 }
3407
3408 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3409 ScopedVMInitArgs* args_out) {
3410 // Remaining part of option string
3411 const char* tail;
3412 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3413
3414 for (int index = 0; index < args->nOptions; index++) {
3415 const JavaVMOption* option = args->options + index;
3416 if (match_option(option, "-XX:Flags=", &tail)) {
3417 Arguments::set_jvm_flags_file(tail);
3418 continue;
3419 }
3420 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3421 if (vm_options_file_args.found_vm_options_file_arg()) {
3422 jio_fprintf(defaultStream::error_stream(),
3423 "The option '%s' is already specified in the options "
3424 "container '%s' so the specification of '%s' in the "
3425 "same options container is an error.\n",
3426 vm_options_file_args.vm_options_file_arg(),
3427 vm_options_file_args.container_name(),
3428 option->optionString);
3429 return JNI_EINVAL;
3430 }
3431 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3432 // If there's a VMOptionsFile, parse that
3433 jint code = insert_vm_options_file(args, tail, index,
3434 &vm_options_file_args, args_out);
3435 if (code != JNI_OK) {
3436 return code;
3437 }
3438 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3439 if (args_out->is_set()) {
3440 // The VMOptions file inserted some options so switch 'args'
3441 // to the new set of options, and continue processing which
3442 // preserves "last option wins" semantics.
3443 args = args_out->get();
3444 // The first option from the VMOptionsFile replaces the
3445 // current option. So we back track to process the
3446 // replacement option.
3447 index--;
3448 }
3449 continue;
3450 }
3451 if (match_option(option, "-XX:+PrintVMOptions")) {
3452 PrintVMOptions = true;
3453 continue;
3454 }
3455 if (match_option(option, "-XX:-PrintVMOptions")) {
3456 PrintVMOptions = false;
3457 continue;
3458 }
3459 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3460 IgnoreUnrecognizedVMOptions = true;
3461 continue;
3462 }
3463 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3464 IgnoreUnrecognizedVMOptions = false;
3465 continue;
3466 }
3467 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3468 JVMFlag::printFlags(tty, false);
3469 vm_exit(0);
3470 }
3471
3472 #ifndef PRODUCT
3473 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3474 JVMFlag::printFlags(tty, true);
3475 vm_exit(0);
3476 }
3477 #endif
3478 }
3479 return JNI_OK;
3480 }
3481
3482 static void print_options(const JavaVMInitArgs *args) {
3483 const char* tail;
3484 for (int index = 0; index < args->nOptions; index++) {
3485 const JavaVMOption *option = args->options + index;
3486 if (match_option(option, "-XX:", &tail)) {
3487 logOption(tail);
3488 }
3489 }
3490 }
3491
3492 bool Arguments::handle_deprecated_print_gc_flags() {
3493 if (PrintGC) {
3494 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3495 }
3496 if (PrintGCDetails) {
3497 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3498 }
3499
3500 if (_legacyGCLogging.lastFlag == 2) {
3501 // -Xloggc was used to specify a filename
3502 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3503
3504 LogTarget(Error, logging) target;
3505 LogStream errstream(target);
3506 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3507 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3508 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3509 }
3510 return true;
3511 }
3512
3513 static void apply_debugger_ergo() {
3514 #ifdef ASSERT
3515 if (ReplayCompiles) {
3516 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3517 }
3518
3519 if (UseDebuggerErgo) {
3520 // Turn on sub-flags
3521 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3522 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3523 }
3524
3525 if (UseDebuggerErgo2) {
3526 // Debugging with limited number of CPUs
3527 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3528 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3529 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3530 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3531 }
3532 #endif // ASSERT
3533 }
3534
3535 // Parse entry point called from JNI_CreateJavaVM
3536
3537 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3538 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3539 JVMFlag::check_all_flag_declarations();
3540
3541 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3542 const char* hotspotrc = ".hotspotrc";
3543 bool settings_file_specified = false;
3544 bool needs_hotspotrc_warning = false;
3545 ScopedVMInitArgs initial_vm_options_args("");
3546 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3547 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3548 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3549
3550 // Pointers to current working set of containers
3551 JavaVMInitArgs* cur_cmd_args;
3552 JavaVMInitArgs* cur_vm_options_args;
3553 JavaVMInitArgs* cur_java_options_args;
3554 JavaVMInitArgs* cur_java_tool_options_args;
3555 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3556
3557 // Containers for modified/expanded options
3558 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3559 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3560 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3561 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3562 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3563
3564 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3565
3566 jint code =
3567 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3568 if (code != JNI_OK) {
3569 return code;
3570 }
3571
3572 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3573 // This is an undocumented feature.
3574 code = parse_java_options_environment_variable(&initial_java_options_args);
3575 if (code != JNI_OK) {
3576 return code;
3577 }
3578
3579 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3580 char *vmoptions = ClassLoader::lookup_vm_options();
3581 if (vmoptions != nullptr) {
3582 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3583 FREE_C_HEAP_ARRAY(char, vmoptions);
3584 if (code != JNI_OK) {
3585 return code;
3586 }
3587 }
3588
3589 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3590 &mod_java_tool_options_args,
3591 &cur_java_tool_options_args);
3592 if (code != JNI_OK) {
3593 return code;
3594 }
3595
3596 code = expand_vm_options_as_needed(initial_cmd_args,
3597 &mod_cmd_args,
3598 &cur_cmd_args);
3599 if (code != JNI_OK) {
3600 return code;
3601 }
3602
3603 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3604 &mod_java_options_args,
3605 &cur_java_options_args);
3606 if (code != JNI_OK) {
3607 return code;
3608 }
3609
3610 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3611 &mod_vm_options_args,
3612 &cur_vm_options_args);
3613 if (code != JNI_OK) {
3614 return code;
3615 }
3616
3617 const char* flags_file = Arguments::get_jvm_flags_file();
3618 settings_file_specified = (flags_file != nullptr);
3619
3620 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3621 if (settings_file_specified) {
3622 if (!process_settings_file(flags_file, true,
3623 IgnoreUnrecognizedVMOptions)) {
3624 return JNI_EINVAL;
3625 }
3626 } else {
3627 #ifdef ASSERT
3628 // Parse default .hotspotrc settings file
3629 if (!process_settings_file(".hotspotrc", false,
3630 IgnoreUnrecognizedVMOptions)) {
3631 return JNI_EINVAL;
3632 }
3633 #else
3634 struct stat buf;
3635 if (os::stat(hotspotrc, &buf) == 0) {
3636 needs_hotspotrc_warning = true;
3637 }
3638 #endif
3639 }
3640
3641 // The settings in the args are applied in this order to the the JVM global flags.
3642 // For historical reasons, the order is DIFFERENT than the scanning order of
3643 // the above expand_vm_options_as_needed() calls.
3644 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3645 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3646 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3647 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3648
3649 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3650 // the options that have been gathered above.
3651 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3652 if (code != JNI_OK) {
3653 return code;
3654 }
3655 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3656 &mod_jdk_aot_vm_options_args,
3657 &cur_jdk_aot_vm_options_args);
3658 if (code != JNI_OK) {
3659 return code;
3660 }
3661
3662 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3663 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3664 const char* optionString = option->optionString;
3665 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3666 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3667 jio_fprintf(defaultStream::error_stream(),
3668 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3669 return JNI_ERR;
3670 }
3671 }
3672
3673 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3674
3675 if (IgnoreUnrecognizedVMOptions) {
3676 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3677 // the JDK so it shouldn't have bad options.
3678 cur_cmd_args->ignoreUnrecognized = true;
3679 cur_java_tool_options_args->ignoreUnrecognized = true;
3680 cur_java_options_args->ignoreUnrecognized = true;
3681 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3682 }
3683
3684 if (PrintVMOptions) {
3685 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3686 print_options(cur_java_tool_options_args);
3687 print_options(cur_cmd_args);
3688 print_options(cur_java_options_args);
3689 print_options(cur_jdk_aot_vm_options_args);
3690 }
3691
3692 // Apply the settings in these args to the JVM global flags.
3693 jint result = parse_vm_init_args(&all_args);
3694
3695 if (result != JNI_OK) {
3696 return result;
3697 }
3698
3699 // Delay warning until here so that we've had a chance to process
3700 // the -XX:-PrintWarnings flag
3701 if (needs_hotspotrc_warning) {
3702 warning("%s file is present but has been ignored. "
3703 "Run with -XX:Flags=%s to load the file.",
3704 hotspotrc, hotspotrc);
3705 }
3706
3707 if (needs_module_property_warning) {
3708 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3709 " names that are reserved for internal use.");
3710 }
3711
3712 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3713 UNSUPPORTED_OPTION(UseLargePages);
3714 #endif
3715
3716 #if defined(AIX)
3717 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3718 #endif
3719
3720 #ifndef PRODUCT
3721 if (TraceBytecodesAt != 0) {
3722 TraceBytecodes = true;
3723 }
3724 #endif // PRODUCT
3725
3726 if (ScavengeRootsInCode == 0) {
3727 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3728 warning("Forcing ScavengeRootsInCode non-zero");
3729 }
3730 ScavengeRootsInCode = 1;
3731 }
3732
3733 if (!handle_deprecated_print_gc_flags()) {
3734 return JNI_EINVAL;
3735 }
3736
3737 // Set object alignment values.
3738 set_object_alignment();
3739
3740 #if !INCLUDE_CDS
3741 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3742 jio_fprintf(defaultStream::error_stream(),
3743 "Shared spaces are not supported in this VM\n");
3744 return JNI_ERR;
3745 }
3746 if (DumpLoadedClassList != nullptr) {
3747 jio_fprintf(defaultStream::error_stream(),
3748 "DumpLoadedClassList is not supported in this VM\n");
3749 return JNI_ERR;
3750 }
3751 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3752 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3753 warning("Shared spaces are not supported in this VM");
3754 UseSharedSpaces = false;
3755 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3756 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3757 }
3758 no_shared_spaces("CDS Disabled");
3759 #endif // INCLUDE_CDS
3760
3761 // Verify NMT arguments
3762 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3763 if (lvl == NMT_unknown) {
3764 jio_fprintf(defaultStream::error_stream(),
3765 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3766 return JNI_ERR;
3767 }
3768 if (PrintNMTStatistics && lvl == NMT_off) {
3769 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3770 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3771 }
3772
3773 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3774 if (trace_dependencies && VerifyDependencies) {
3775 warning("dependency logging results may be inflated by VerifyDependencies");
3776 }
3777
3778 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3779 log_is_enabled(Info, class, load, cause);
3780 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3781 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3782 }
3783
3784 apply_debugger_ergo();
3785
3786 // The VMThread needs to stop now and then to execute these debug options.
3787 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3788 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3789 }
3790
3791 if (log_is_enabled(Info, arguments)) {
3792 LogStream st(Log(arguments)::info());
3793 Arguments::print_on(&st);
3794 }
3795
3796 return JNI_OK;
3797 }
3798
3799 void Arguments::set_compact_headers_flags() {
3800 #ifdef _LP64
3801 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3802 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3803 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3804 }
3805 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3806 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3807 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3808 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3809
3810 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3811 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3812 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3813 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3814 } else {
3815 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3816 }
3817 }
3818 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3819 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3820 }
3821 #endif
3822 }
3823
3824 jint Arguments::apply_ergo() {
3825 // Set flags based on ergonomics.
3826 jint result = set_ergonomics_flags();
3827 if (result != JNI_OK) return result;
3828
3829 // Set heap size based on available physical memory
3830 set_heap_size();
3831
3832 GCConfig::arguments()->initialize();
3833
3834 set_compact_headers_flags();
3835
3836 if (UseCompressedClassPointers) {
3837 CompressedKlassPointers::pre_initialize();
3838 }
3839
3840 CDSConfig::ergo_initialize();
3841
3842 // Initialize Metaspace flags and alignments
3843 Metaspace::ergo_initialize();
3844
3845 if (!StringDedup::ergo_initialize()) {
3846 return JNI_EINVAL;
3847 }
3848
3849 // Set compiler flags after GC is selected and GC specific
3850 // flags (LoopStripMiningIter) are set.
3851 CompilerConfig::ergo_initialize();
3852
3853 // Set bytecode rewriting flags
3854 set_bytecode_flags();
3855
3856 // Set flags if aggressive optimization flags are enabled
3857 jint code = set_aggressive_opts_flags();
3858 if (code != JNI_OK) {
3859 return code;
3860 }
3861
3862 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3863 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3864 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3865 warning("UseSecondarySupersTable is not supported");
3866 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3867 }
3868 if (!UseSecondarySupersTable) {
3869 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3870 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3871 }
3872
3873 #ifdef ZERO
3874 // Clear flags not supported on zero.
3875 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3876 #endif // ZERO
3877
3878 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3879 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3880 DebugNonSafepoints = true;
3881 }
3882
3883 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3884 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3885 }
3886
3887 // Treat the odd case where local verification is enabled but remote
3888 // verification is not as if both were enabled.
3889 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3890 log_info(verification)("Turning on remote verification because local verification is on");
3891 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3892 }
3893
3894 #ifndef PRODUCT
3895 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3896 if (use_vm_log()) {
3897 LogVMOutput = true;
3898 }
3899 }
3900 #endif // PRODUCT
3901
3902 if (PrintCommandLineFlags) {
3903 JVMFlag::printSetFlags(tty);
3904 }
3905
3906 #if COMPILER2_OR_JVMCI
3907 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3908 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3909 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3910 }
3911 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3912
3913 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3914 if (!EnableVectorReboxing) {
3915 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3916 } else {
3917 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3918 }
3919 }
3920 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3921 }
3922 #endif // COMPILER2_OR_JVMCI
3923
3924 #ifdef COMPILER2
3925 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3926 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3927 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3928 }
3929 #endif // COMPILER2
3930
3931 if (log_is_enabled(Info, perf, class, link)) {
3932 if (!UsePerfData) {
3933 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3934 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3935 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3936 }
3937 }
3938
3939 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3940 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3941 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3942 }
3943 }
3944 return JNI_OK;
3945 }
3946
3947 jint Arguments::adjust_after_os() {
3948 if (UseNUMA) {
3949 if (UseParallelGC) {
3950 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3951 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3952 }
3953 }
3954 }
3955 return JNI_OK;
3956 }
3957
3958 int Arguments::PropertyList_count(SystemProperty* pl) {
3959 int count = 0;
3960 while(pl != nullptr) {
3961 count++;
3962 pl = pl->next();
3963 }
3964 return count;
3965 }
3966
3967 // Return the number of readable properties.
3968 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3969 int count = 0;
3970 while(pl != nullptr) {
3971 if (pl->readable()) {
3972 count++;
3973 }
3974 pl = pl->next();
3975 }
3976 return count;
3977 }
3978
3979 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3980 assert(key != nullptr, "just checking");
3981 SystemProperty* prop;
3982 for (prop = pl; prop != nullptr; prop = prop->next()) {
3983 if (strcmp(key, prop->key()) == 0) return prop->value();
3984 }
3985 return nullptr;
3986 }
3987
3988 // Return the value of the requested property provided that it is a readable property.
3989 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3990 assert(key != nullptr, "just checking");
3991 SystemProperty* prop;
3992 // Return the property value if the keys match and the property is not internal or
3993 // it's the special internal property "jdk.boot.class.path.append".
3994 for (prop = pl; prop != nullptr; prop = prop->next()) {
3995 if (strcmp(key, prop->key()) == 0) {
3996 if (!prop->internal()) {
3997 return prop->value();
3998 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3999 return prop->value();
4000 } else {
4001 // Property is internal and not jdk.boot.class.path.append so return null.
4002 return nullptr;
4003 }
4004 }
4005 }
4006 return nullptr;
4007 }
4008
4009 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4010 SystemProperty* p = *plist;
4011 if (p == nullptr) {
4012 *plist = new_p;
4013 } else {
4014 while (p->next() != nullptr) {
4015 p = p->next();
4016 }
4017 p->set_next(new_p);
4018 }
4019 }
4020
4021 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4022 bool writeable, bool internal) {
4023 if (plist == nullptr)
4024 return;
4025
4026 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4027 PropertyList_add(plist, new_p);
4028 }
4029
4030 void Arguments::PropertyList_add(SystemProperty *element) {
4031 PropertyList_add(&_system_properties, element);
4032 }
4033
4034 // This add maintains unique property key in the list.
4035 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4036 PropertyAppendable append, PropertyWriteable writeable,
4037 PropertyInternal internal) {
4038 if (plist == nullptr)
4039 return;
4040
4041 // If property key exists and is writeable, then update with new value.
4042 // Trying to update a non-writeable property is silently ignored.
4043 SystemProperty* prop;
4044 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4045 if (strcmp(k, prop->key()) == 0) {
4046 if (append == AppendProperty) {
4047 prop->append_writeable_value(v);
4048 } else {
4049 prop->set_writeable_value(v);
4050 }
4051 return;
4052 }
4053 }
4054
4055 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4056 }
4057
4058 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4059 // Returns true if all of the source pointed by src has been copied over to
4060 // the destination buffer pointed by buf. Otherwise, returns false.
4061 // Notes:
4062 // 1. If the length (buflen) of the destination buffer excluding the
4063 // null terminator character is not long enough for holding the expanded
4064 // pid characters, it also returns false instead of returning the partially
4065 // expanded one.
4066 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4067 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4068 char* buf, size_t buflen) {
4069 const char* p = src;
4070 char* b = buf;
4071 const char* src_end = &src[srclen];
4072 char* buf_end = &buf[buflen - 1];
4073
4074 while (p < src_end && b < buf_end) {
4075 if (*p == '%') {
4076 switch (*(++p)) {
4077 case '%': // "%%" ==> "%"
4078 *b++ = *p++;
4079 break;
4080 case 'p': { // "%p" ==> current process id
4081 // buf_end points to the character before the last character so
4082 // that we could write '\0' to the end of the buffer.
4083 size_t buf_sz = buf_end - b + 1;
4084 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4085
4086 // if jio_snprintf fails or the buffer is not long enough to hold
4087 // the expanded pid, returns false.
4088 if (ret < 0 || ret >= (int)buf_sz) {
4089 return false;
4090 } else {
4091 b += ret;
4092 assert(*b == '\0', "fail in copy_expand_pid");
4093 if (p == src_end && b == buf_end + 1) {
4094 // reach the end of the buffer.
4095 return true;
4096 }
4097 }
4098 p++;
4099 break;
4100 }
4101 default :
4102 *b++ = '%';
4103 }
4104 } else {
4105 *b++ = *p++;
4106 }
4107 }
4108 *b = '\0';
4109 return (p == src_end); // return false if not all of the source was copied
4110 }