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 #include <string.h>
80
81 static const char _default_java_launcher[] = "generic";
82
83 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
84
85 char* Arguments::_jvm_flags_file = nullptr;
86 char** Arguments::_jvm_flags_array = nullptr;
87 int Arguments::_num_jvm_flags = 0;
88 char** Arguments::_jvm_args_array = nullptr;
89 int Arguments::_num_jvm_args = 0;
90 unsigned int Arguments::_addmods_count = 0;
91 #if INCLUDE_JVMCI
92 bool Arguments::_jvmci_module_added = false;
93 #endif
94 char* Arguments::_java_command = nullptr;
95 SystemProperty* Arguments::_system_properties = nullptr;
96 size_t Arguments::_conservative_max_heap_alignment = 0;
97 Arguments::Mode Arguments::_mode = _mixed;
98 const char* Arguments::_java_vendor_url_bug = nullptr;
99 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
100 bool Arguments::_executing_unit_tests = false;
101
102 // These parameters are reset in method parse_vm_init_args()
103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
105 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
106 bool Arguments::_ClipInlining = ClipInlining;
107 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
108
109 bool Arguments::_enable_preview = false;
110 bool Arguments::_has_jdwp_agent = false;
111
112 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
113
114 // These are not set by the JDK's built-in launchers, but they can be set by
115 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
116 // JavaVMOption in jni.h.
117 abort_hook_t Arguments::_abort_hook = nullptr;
118 exit_hook_t Arguments::_exit_hook = nullptr;
119 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
120
121
122 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
123 SystemProperty *Arguments::_java_library_path = nullptr;
124 SystemProperty *Arguments::_java_home = nullptr;
125 SystemProperty *Arguments::_java_class_path = nullptr;
126 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
127 SystemProperty *Arguments::_vm_info = nullptr;
128
129 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
130 PathString *Arguments::_boot_class_path = nullptr;
131 bool Arguments::_has_jimage = false;
132
133 char* Arguments::_ext_dirs = nullptr;
134
135 // True if -Xshare:auto option was specified.
136 static bool xshare_auto_cmd_line = false;
137
138 // True if -Xint/-Xmixed/-Xcomp were specified
139 static bool mode_flag_cmd_line = false;
140
141 struct VMInitArgsGroup {
142 const JavaVMInitArgs* _args;
143 JVMFlagOrigin _origin;
144 };
145
146 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
147 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
148 if (new_value == nullptr) {
149 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
150 return false;
151 }
152 if (_value != nullptr) {
153 FreeHeap(_value);
154 }
155 _value = new_value;
156 strcpy(_value, value);
157 return true;
158 }
159
160 void PathString::append_value(const char *value) {
161 char *sp;
162 size_t len = 0;
163 if (value != nullptr) {
164 len = strlen(value);
165 if (_value != nullptr) {
166 len += strlen(_value);
167 }
168 sp = AllocateHeap(len+2, mtArguments);
169 assert(sp != nullptr, "Unable to allocate space for new append path value");
170 if (sp != nullptr) {
171 if (_value != nullptr) {
172 strcpy(sp, _value);
173 strcat(sp, os::path_separator());
174 strcat(sp, value);
175 FreeHeap(_value);
176 } else {
177 strcpy(sp, value);
178 }
179 _value = sp;
180 }
181 }
182 }
183
184 PathString::PathString(const char* value) {
185 if (value == nullptr) {
186 _value = nullptr;
187 } else {
188 _value = AllocateHeap(strlen(value)+1, mtArguments);
189 strcpy(_value, value);
190 }
191 }
192
193 PathString::~PathString() {
194 if (_value != nullptr) {
195 FreeHeap(_value);
196 _value = nullptr;
197 }
198 }
199
200 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
201 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
202 size_t len = strlen(module_name) + 1;
203 _module_name = AllocateHeap(len, mtInternal);
204 strncpy(_module_name, module_name, len); // copy the trailing null
205 _path = new PathString(path);
206 }
207
208 ModulePatchPath::~ModulePatchPath() {
209 if (_module_name != nullptr) {
210 FreeHeap(_module_name);
211 _module_name = nullptr;
212 }
213 if (_path != nullptr) {
214 delete _path;
215 _path = nullptr;
216 }
217 }
218
219 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
220 if (key == nullptr) {
221 _key = nullptr;
222 } else {
223 _key = AllocateHeap(strlen(key)+1, mtArguments);
224 strcpy(_key, key);
225 }
226 _next = nullptr;
227 _internal = internal;
228 _writeable = writeable;
229 }
230
231 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
232 // part of the option string.
233 static bool match_option(const JavaVMOption *option, const char* name,
234 const char** tail) {
235 size_t len = strlen(name);
236 if (strncmp(option->optionString, name, len) == 0) {
237 *tail = option->optionString + len;
238 return true;
239 } else {
240 return false;
241 }
242 }
243
244 // Check if 'option' matches 'name'. No "tail" is allowed.
245 static bool match_option(const JavaVMOption *option, const char* name) {
246 const char* tail = nullptr;
247 bool result = match_option(option, name, &tail);
248 if (tail != nullptr && *tail == '\0') {
249 return result;
250 } else {
251 return false;
252 }
253 }
254
255 // Return true if any of the strings in null-terminated array 'names' matches.
256 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
257 // the option must match exactly.
258 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
259 bool tail_allowed) {
260 for (/* empty */; *names != nullptr; ++names) {
261 if (match_option(option, *names, tail)) {
262 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
263 return true;
264 }
265 }
266 }
267 return false;
268 }
269
270 #if INCLUDE_JFR
271 static bool _has_jfr_option = false; // is using JFR
272
273 // return true on failure
274 static bool match_jfr_option(const JavaVMOption** option) {
275 assert((*option)->optionString != nullptr, "invariant");
276 char* tail = nullptr;
277 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
278 _has_jfr_option = true;
279 return Jfr::on_start_flight_recording_option(option, tail);
280 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
281 _has_jfr_option = true;
282 return Jfr::on_flight_recorder_option(option, tail);
283 }
284 return false;
285 }
286
287 bool Arguments::has_jfr_option() {
288 return _has_jfr_option;
289 }
290 #endif
291
292 static void logOption(const char* opt) {
293 if (PrintVMOptions) {
294 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
295 }
296 }
297
298 bool needs_module_property_warning = false;
299
300 #define MODULE_PROPERTY_PREFIX "jdk.module."
301 #define MODULE_PROPERTY_PREFIX_LEN 11
302 #define ADDEXPORTS "addexports"
303 #define ADDEXPORTS_LEN 10
304 #define ADDREADS "addreads"
305 #define ADDREADS_LEN 8
306 #define ADDOPENS "addopens"
307 #define ADDOPENS_LEN 8
308 #define PATCH "patch"
309 #define PATCH_LEN 5
310 #define ADDMODS "addmods"
311 #define ADDMODS_LEN 7
312 #define LIMITMODS "limitmods"
313 #define LIMITMODS_LEN 9
314 #define PATH "path"
315 #define PATH_LEN 4
316 #define UPGRADE_PATH "upgrade.path"
317 #define UPGRADE_PATH_LEN 12
318 #define ENABLE_NATIVE_ACCESS "enable.native.access"
319 #define ENABLE_NATIVE_ACCESS_LEN 20
320 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
321 #define ILLEGAL_NATIVE_ACCESS_LEN 21
322 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
323 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
324 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
325 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
326
327 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
328 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
329 return ((strncmp(option, property, len) == 0) &&
330 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
331 }
332
333 // Return true if property starts with "jdk.module." and its ensuing chars match
334 // any of the reserved module properties.
335 // property should be passed without the leading "-D".
336 bool Arguments::is_internal_module_property(const char* property) {
337 return internal_module_property_helper(property, false);
338 }
339
340 // Returns true if property is one of those recognized by is_internal_module_property() but
341 // is not supported by CDS archived full module graph.
342 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
343 return internal_module_property_helper(property, true);
344 }
345
346 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
347 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
348 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
349 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
350 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
351 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
352 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
353 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
354 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
355 return true;
356 }
357
358 if (!check_for_cds) {
359 // CDS notes: these properties are supported by CDS archived full module graph.
360 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
361 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
362 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
363 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
364 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
365 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
366 return true;
367 }
368 }
369 }
370 return false;
371 }
372
373 // Process java launcher properties.
374 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
375 // See if sun.java.launcher is defined.
376 // Must do this before setting up other system properties,
377 // as some of them may depend on launcher type.
378 for (int index = 0; index < args->nOptions; index++) {
379 const JavaVMOption* option = args->options + index;
380 const char* tail;
381
382 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
383 process_java_launcher_argument(tail, option->extraInfo);
384 continue;
385 }
386 if (match_option(option, "-XX:+ExecutingUnitTests")) {
387 _executing_unit_tests = true;
388 continue;
389 }
390 }
391 }
392
393 // Initialize system properties key and value.
394 void Arguments::init_system_properties() {
395
396 // Set up _boot_class_path which is not a property but
397 // relies heavily on argument processing and the jdk.boot.class.path.append
398 // property. It is used to store the underlying boot class path.
399 _boot_class_path = new PathString(nullptr);
400
401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
402 "Java Virtual Machine Specification", false));
403 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
404 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
405 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
406
407 // Initialize the vm.info now, but it will need updating after argument parsing.
408 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
409
410 // Following are JVMTI agent writable properties.
411 // Properties values are set to nullptr and they are
412 // os specific they are initialized in os::init_system_properties_values().
413 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
414 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
415 _java_home = new SystemProperty("java.home", nullptr, true);
416 _java_class_path = new SystemProperty("java.class.path", "", true);
417 // jdk.boot.class.path.append is a non-writeable, internal property.
418 // It can only be set by either:
419 // - -Xbootclasspath/a:
420 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
421 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
422
423 // Add to System Property list.
424 PropertyList_add(&_system_properties, _sun_boot_library_path);
425 PropertyList_add(&_system_properties, _java_library_path);
426 PropertyList_add(&_system_properties, _java_home);
427 PropertyList_add(&_system_properties, _java_class_path);
428 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
429 PropertyList_add(&_system_properties, _vm_info);
430
431 // Set OS specific system properties values
432 os::init_system_properties_values();
433 }
434
435 // Update/Initialize System properties after JDK version number is known
436 void Arguments::init_version_specific_system_properties() {
437 enum { bufsz = 16 };
438 char buffer[bufsz];
439 const char* spec_vendor = "Oracle Corporation";
440 uint32_t spec_version = JDK_Version::current().major_version();
441
442 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
443
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
446 PropertyList_add(&_system_properties,
447 new SystemProperty("java.vm.specification.version", buffer, false));
448 PropertyList_add(&_system_properties,
449 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
450 }
451
452 /*
453 * -XX argument processing:
454 *
455 * -XX arguments are defined in several places, such as:
456 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
457 * -XX arguments are parsed in parse_argument().
458 * -XX argument bounds checking is done in check_vm_args_consistency().
459 *
460 * Over time -XX arguments may change. There are mechanisms to handle common cases:
461 *
462 * ALIASED: An option that is simply another name for another option. This is often
463 * part of the process of deprecating a flag, but not all aliases need
464 * to be deprecated.
465 *
466 * Create an alias for an option by adding the old and new option names to the
467 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
468 *
469 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
470 * support may be removed in the future. Both regular and aliased options may be
471 * deprecated.
472 *
473 * Add a deprecation warning for an option (or alias) by adding an entry in the
474 * "special_jvm_flags" table and setting the "deprecated_in" field.
475 * Often an option "deprecated" in one major release will
476 * be made "obsolete" in the next. In this case the entry should also have its
477 * "obsolete_in" field set.
478 *
479 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
480 * on the command line. A warning is printed to let the user know that option might not
481 * be accepted in the future.
482 *
483 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
484 * table and setting the "obsolete_in" field.
485 *
486 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
487 * to the current JDK version. The system will flatly refuse to admit the existence of
488 * the flag. This allows a flag to die automatically over JDK releases.
489 *
490 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
491 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
492 * - Newly obsolete or expired deprecated options should have their global variable
493 * definitions removed (from globals.hpp, etc) and related implementations removed.
494 *
495 * Recommended approach for removing options:
496 *
497 * To remove options commonly used by customers (e.g. product -XX options), use
498 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
499 *
500 * To remove internal options (e.g. diagnostic, experimental, develop options), use
501 * a 2-step model adding major release numbers to the obsolete and expire columns.
502 *
503 * To change the name of an option, use the alias table as well as a 2-step
504 * model adding major release numbers to the deprecate and expire columns.
505 * Think twice about aliasing commonly used customer options.
506 *
507 * There are times when it is appropriate to leave a future release number as undefined.
508 *
509 * Tests: Aliases should be tested in VMAliasOptions.java.
510 * Deprecated options should be tested in VMDeprecatedOptions.java.
511 */
512
513 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
514 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
515 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
516 // the command-line as usual, but will issue a warning.
517 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
518 // the command-line, while issuing a warning and ignoring the flag value.
519 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
520 // existence of the flag.
521 //
522 // MANUAL CLEANUP ON JDK VERSION UPDATES:
523 // This table ensures that the handling of options will update automatically when the JDK
524 // version is incremented, but the source code needs to be cleanup up manually:
525 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
526 // variable should be removed, as well as users of the variable.
527 // - As "deprecated" options age into "obsolete" options, move the entry into the
528 // "Obsolete Flags" section of the table.
529 // - All expired options should be removed from the table.
530 static SpecialFlag const special_jvm_flags[] = {
531 // -------------- Deprecated Flags --------------
532 // --- Non-alias flags - sorted by obsolete_in then expired_in:
533 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
536 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
537 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
538 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
539 #ifdef _LP64
540 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
541 #endif
542 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
543 { "ParallelRefProcBalancingEnabled", 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 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
554 #if defined(AARCH64)
555 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
556 #endif
557
558 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
559
560 #ifdef ASSERT
561 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
562 #endif
563
564 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
565 // These entries will generate build errors. Their purpose is to test the macros.
566 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
567 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
568 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
569 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
570 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
571 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
572 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
573 #endif
574
575 { nullptr, JDK_Version(0), JDK_Version(0) }
576 };
577
578 // Flags that are aliases for other flags.
579 typedef struct {
580 const char* alias_name;
581 const char* real_name;
582 } AliasedFlag;
583
584 static AliasedFlag const aliased_jvm_flags[] = {
585 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
586 { nullptr, nullptr}
587 };
588
589 // Return true if "v" is less than "other", where "other" may be "undefined".
590 static bool version_less_than(JDK_Version v, JDK_Version other) {
591 assert(!v.is_undefined(), "must be defined");
592 if (!other.is_undefined() && v.compare(other) >= 0) {
593 return false;
594 } else {
595 return true;
596 }
597 }
598
599 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
600 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
601 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
602 flag = special_jvm_flags[i];
603 return true;
604 }
605 }
606 return false;
607 }
608
609 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
610 assert(version != nullptr, "Must provide a version buffer");
611 SpecialFlag flag;
612 if (lookup_special_flag(flag_name, flag)) {
613 if (!flag.obsolete_in.is_undefined()) {
614 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
615 *version = flag.obsolete_in;
616 // This flag may have been marked for obsoletion in this version, but we may not
617 // have actually removed it yet. Rather than ignoring it as soon as we reach
618 // this version we allow some time for the removal to happen. So if the flag
619 // still actually exists we process it as normal, but issue an adjusted warning.
620 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
621 if (real_flag != nullptr) {
622 char version_str[256];
623 version->to_string(version_str, sizeof(version_str));
624 warning("Temporarily processing option %s; support is scheduled for removal in %s",
625 flag_name, version_str);
626 return false;
627 }
628 return true;
629 }
630 }
631 }
632 return false;
633 }
634
635 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
636 assert(version != nullptr, "Must provide a version buffer");
637 SpecialFlag flag;
638 if (lookup_special_flag(flag_name, flag)) {
639 if (!flag.deprecated_in.is_undefined()) {
640 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
641 version_less_than(JDK_Version::current(), flag.expired_in)) {
642 *version = flag.deprecated_in;
643 return 1;
644 } else {
645 return -1;
646 }
647 }
648 }
649 return 0;
650 }
651
652 const char* Arguments::real_flag_name(const char *flag_name) {
653 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
654 const AliasedFlag& flag_status = aliased_jvm_flags[i];
655 if (strcmp(flag_status.alias_name, flag_name) == 0) {
656 return flag_status.real_name;
657 }
658 }
659 return flag_name;
660 }
661
662 #ifdef ASSERT
663 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
664 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
665 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
666 return true;
667 }
668 }
669 return false;
670 }
671
672 // Verifies the correctness of the entries in the special_jvm_flags table.
673 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
674 // version being earlier than the deprecation version, then a warning is issued
675 // and verification fails - by returning false. If it is detected that the table
676 // is out of date, with respect to the current version, then ideally a warning is
677 // issued but verification does not fail. This allows the VM to operate when the
678 // version is first updated, without needing to update all the impacted flags at
679 // the same time. In practice we can't issue the warning immediately when the version
680 // is updated as it occurs for every test and some tests are not prepared to handle
681 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
682 // if the check_globals flag is true, and in addition allow a grace period and only
683 // check for stale flags when we hit build 25 (which is far enough into the 6 month
684 // release cycle that all flag updates should have been processed, whilst still
685 // leaving time to make the change before RDP2).
686 // We use a gtest to call this, passing true, so that we can detect stale flags before
687 // the end of the release cycle.
688
689 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
690
691 bool Arguments::verify_special_jvm_flags(bool check_globals) {
692 bool success = true;
693 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
694 const SpecialFlag& flag = special_jvm_flags[i];
695 if (lookup_special_flag(flag.name, i)) {
696 warning("Duplicate special flag declaration \"%s\"", flag.name);
697 success = false;
698 }
699 if (flag.deprecated_in.is_undefined() &&
700 flag.obsolete_in.is_undefined()) {
701 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
702 success = false;
703 }
704
705 if (!flag.deprecated_in.is_undefined()) {
706 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
707 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
708 success = false;
709 }
710
711 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
712 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
713 success = false;
714 }
715 }
716
717 if (!flag.obsolete_in.is_undefined()) {
718 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
719 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
720 success = false;
721 }
722
723 // if flag has become obsolete it should not have a "globals" flag defined anymore.
724 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
725 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
726 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
727 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
728 success = false;
729 }
730 }
731
732 } else if (!flag.expired_in.is_undefined()) {
733 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
734 success = false;
735 }
736
737 if (!flag.expired_in.is_undefined()) {
738 // if flag has become expired it should not have a "globals" flag defined anymore.
739 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
740 !version_less_than(JDK_Version::current(), flag.expired_in)) {
741 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
742 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
743 success = false;
744 }
745 }
746 }
747 }
748 return success;
749 }
750 #endif
751
752 bool Arguments::atojulong(const char *s, julong* result) {
753 return parse_integer(s, result);
754 }
755
756 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
757 if (size < min_size) return arg_too_small;
758 if (size > max_size) return arg_too_big;
759 return arg_in_range;
760 }
761
762 // Describe an argument out of range error
763 void Arguments::describe_range_error(ArgsRange errcode) {
764 switch(errcode) {
765 case arg_too_big:
766 jio_fprintf(defaultStream::error_stream(),
767 "The specified size exceeds the maximum "
768 "representable size.\n");
769 break;
770 case arg_too_small:
771 case arg_unreadable:
772 case arg_in_range:
773 // do nothing for now
774 break;
775 default:
776 ShouldNotReachHere();
777 }
778 }
779
780 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
781 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
782 return true;
783 } else {
784 return false;
785 }
786 }
787
788 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
789 // strtod allows leading whitespace, but our flag format does not.
790 if (*value == '\0' || isspace((unsigned char) *value)) {
791 return false;
792 }
793 char* end;
794 errno = 0;
795 double v = strtod(value, &end);
796 if ((errno != 0) || (*end != 0)) {
797 return false;
798 }
799 if (g_isnan(v) || !g_isfinite(v)) {
800 // Currently we cannot handle these special values.
801 return false;
802 }
803
804 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
805 return true;
806 }
807 return false;
808 }
809
810 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
811 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
812
813 if (flag->is_int()) {
814 int v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_int(flag, &v, origin);
817 }
818 } else if (flag->is_uint()) {
819 uint v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_uint(flag, &v, origin);
822 }
823 } else if (flag->is_intx()) {
824 intx v;
825 if (parse_integer(value, &v)) {
826 result = JVMFlagAccess::set_intx(flag, &v, origin);
827 }
828 } else if (flag->is_uintx()) {
829 uintx v;
830 if (parse_integer(value, &v)) {
831 result = JVMFlagAccess::set_uintx(flag, &v, origin);
832 }
833 } else if (flag->is_uint64_t()) {
834 uint64_t v;
835 if (parse_integer(value, &v)) {
836 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
837 }
838 } else if (flag->is_size_t()) {
839 size_t v;
840 if (parse_integer(value, &v)) {
841 result = JVMFlagAccess::set_size_t(flag, &v, origin);
842 }
843 }
844
845 return result == JVMFlag::SUCCESS;
846 }
847
848 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
849 if (value[0] == '\0') {
850 value = nullptr;
851 }
852 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
853 // Contract: JVMFlag always returns a pointer that needs freeing.
854 FREE_C_HEAP_ARRAY(char, value);
855 return true;
856 }
857
858 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
859 const char* old_value = "";
860 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
861 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
862 size_t new_len = strlen(new_value);
863 const char* value;
864 char* free_this_too = nullptr;
865 if (old_len == 0) {
866 value = new_value;
867 } else if (new_len == 0) {
868 value = old_value;
869 } else {
870 size_t length = old_len + 1 + new_len + 1;
871 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
872 // each new setting adds another LINE to the switch:
873 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
874 value = buf;
875 free_this_too = buf;
876 }
877 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
878 // JVMFlag always returns a pointer that needs freeing.
879 FREE_C_HEAP_ARRAY(char, value);
880 // JVMFlag made its own copy, so I must delete my own temp. buffer.
881 FREE_C_HEAP_ARRAY(char, free_this_too);
882 return true;
883 }
884
885 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
886 const char* real_name = real_flag_name(arg);
887 JDK_Version since = JDK_Version();
888 switch (is_deprecated_flag(arg, &since)) {
889 case -1: {
890 // Obsolete or expired, so don't process normally,
891 // but allow for an obsolete flag we're still
892 // temporarily allowing.
893 if (!is_obsolete_flag(arg, &since)) {
894 return real_name;
895 }
896 // Note if we're not considered obsolete then we can't be expired either
897 // as obsoletion must come first.
898 return nullptr;
899 }
900 case 0:
901 return real_name;
902 case 1: {
903 char version[256];
904 since.to_string(version, sizeof(version));
905 if (real_name != arg) {
906 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
907 arg, version, real_name);
908 } else {
909 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
910 arg, version);
911 }
912 return real_name;
913 }
914 }
915 ShouldNotReachHere();
916 return nullptr;
917 }
918
919 #define BUFLEN 255
920
921 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
922 char name_copied[BUFLEN+1];
923 if (name[name_length] != 0) {
924 if (name_length > BUFLEN) {
925 return nullptr;
926 } else {
927 strncpy(name_copied, name, name_length);
928 name_copied[name_length] = '\0';
929 name = name_copied;
930 }
931 }
932
933 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
934 if (real_name == nullptr) {
935 return nullptr;
936 }
937 JVMFlag* flag = JVMFlag::find_flag(real_name);
938 return flag;
939 }
940
941 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
942 bool is_bool = false;
943 bool bool_val = false;
944 char c = *arg;
945 if (c == '+' || c == '-') {
946 is_bool = true;
947 bool_val = (c == '+');
948 arg++;
949 }
950
951 const char* name = arg;
952 while (true) {
953 c = *arg;
954 if (isalnum(c) || (c == '_')) {
955 ++arg;
956 } else {
957 break;
958 }
959 }
960
961 size_t name_len = size_t(arg - name);
962 if (name_len == 0) {
963 return false;
964 }
965
966 JVMFlag* flag = find_jvm_flag(name, name_len);
967 if (flag == nullptr) {
968 return false;
969 }
970
971 if (is_bool) {
972 if (*arg != 0) {
973 // Error -- extra characters such as -XX:+BoolFlag=123
974 return false;
975 }
976 return set_bool_flag(flag, bool_val, origin);
977 }
978
979 if (arg[0] == '=') {
980 const char* value = arg + 1;
981 if (flag->is_ccstr()) {
982 if (flag->ccstr_accumulates()) {
983 return append_to_string_flag(flag, value, origin);
984 } else {
985 return set_string_flag(flag, value, origin);
986 }
987 } else if (flag->is_double()) {
988 return set_fp_numeric_flag(flag, value, origin);
989 } else {
990 return set_numeric_flag(flag, value, origin);
991 }
992 }
993
994 if (arg[0] == ':' && arg[1] == '=') {
995 // -XX:Foo:=xxx will reset the string flag to the given value.
996 const char* value = arg + 2;
997 return set_string_flag(flag, value, origin);
998 }
999
1000 return false;
1001 }
1002
1003 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1004 assert(bldarray != nullptr, "illegal argument");
1005
1006 if (arg == nullptr) {
1007 return;
1008 }
1009
1010 int new_count = *count + 1;
1011
1012 // expand the array and add arg to the last element
1013 if (*bldarray == nullptr) {
1014 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1015 } else {
1016 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1017 }
1018 (*bldarray)[*count] = os::strdup_check_oom(arg);
1019 *count = new_count;
1020 }
1021
1022 void Arguments::build_jvm_args(const char* arg) {
1023 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1024 }
1025
1026 void Arguments::build_jvm_flags(const char* arg) {
1027 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1028 }
1029
1030 // utility function to return a string that concatenates all
1031 // strings in a given char** array
1032 const char* Arguments::build_resource_string(char** args, int count) {
1033 if (args == nullptr || count == 0) {
1034 return nullptr;
1035 }
1036 size_t length = 0;
1037 for (int i = 0; i < count; i++) {
1038 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1039 }
1040 char* s = NEW_RESOURCE_ARRAY(char, length);
1041 char* dst = s;
1042 for (int j = 0; j < count; j++) {
1043 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1044 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1045 dst += offset;
1046 length -= offset;
1047 }
1048 return (const char*) s;
1049 }
1050
1051 void Arguments::print_on(outputStream* st) {
1052 st->print_cr("VM Arguments:");
1053 if (num_jvm_flags() > 0) {
1054 st->print("jvm_flags: "); print_jvm_flags_on(st);
1055 st->cr();
1056 }
1057 if (num_jvm_args() > 0) {
1058 st->print("jvm_args: "); print_jvm_args_on(st);
1059 st->cr();
1060 }
1061 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1062 if (_java_class_path != nullptr) {
1063 char* path = _java_class_path->value();
1064 size_t len = strlen(path);
1065 st->print("java_class_path (initial): ");
1066 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1067 if (len == 0) {
1068 st->print_raw_cr("<not set>");
1069 } else {
1070 st->print_raw_cr(path, len);
1071 }
1072 }
1073 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1074 }
1075
1076 void Arguments::print_summary_on(outputStream* st) {
1077 // Print the command line. Environment variables that are helpful for
1078 // reproducing the problem are written later in the hs_err file.
1079 // flags are from setting file
1080 if (num_jvm_flags() > 0) {
1081 st->print_raw("Settings File: ");
1082 print_jvm_flags_on(st);
1083 st->cr();
1084 }
1085 // args are the command line and environment variable arguments.
1086 st->print_raw("Command Line: ");
1087 if (num_jvm_args() > 0) {
1088 print_jvm_args_on(st);
1089 }
1090 // this is the classfile and any arguments to the java program
1091 if (java_command() != nullptr) {
1092 st->print("%s", java_command());
1093 }
1094 st->cr();
1095 }
1096
1097 void Arguments::set_jvm_flags_file(const char *value) {
1098 if (_jvm_flags_file != nullptr) {
1099 os::free(_jvm_flags_file);
1100 }
1101 _jvm_flags_file = os::strdup_check_oom(value);
1102 }
1103
1104 void Arguments::print_jvm_flags_on(outputStream* st) {
1105 if (_num_jvm_flags > 0) {
1106 for (int i=0; i < _num_jvm_flags; i++) {
1107 st->print("%s ", _jvm_flags_array[i]);
1108 }
1109 }
1110 }
1111
1112 void Arguments::print_jvm_args_on(outputStream* st) {
1113 if (_num_jvm_args > 0) {
1114 for (int i=0; i < _num_jvm_args; i++) {
1115 st->print("%s ", _jvm_args_array[i]);
1116 }
1117 }
1118 }
1119
1120 bool Arguments::process_argument(const char* arg,
1121 jboolean ignore_unrecognized,
1122 JVMFlagOrigin origin) {
1123 JDK_Version since = JDK_Version();
1124
1125 if (parse_argument(arg, origin)) {
1126 return true;
1127 }
1128
1129 // Determine if the flag has '+', '-', or '=' characters.
1130 bool has_plus_minus = (*arg == '+' || *arg == '-');
1131 const char* const argname = has_plus_minus ? arg + 1 : arg;
1132
1133 size_t arg_len;
1134 const char* equal_sign = strchr(argname, '=');
1135 if (equal_sign == nullptr) {
1136 arg_len = strlen(argname);
1137 } else {
1138 arg_len = equal_sign - argname;
1139 }
1140
1141 // Only make the obsolete check for valid arguments.
1142 if (arg_len <= BUFLEN) {
1143 // Construct a string which consists only of the argument name without '+', '-', or '='.
1144 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1145 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1146 if (is_obsolete_flag(stripped_argname, &since)) {
1147 char version[256];
1148 since.to_string(version, sizeof(version));
1149 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1150 return true;
1151 }
1152 }
1153
1154 // For locked flags, report a custom error message if available.
1155 // Otherwise, report the standard unrecognized VM option.
1156 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1157 if (found_flag != nullptr) {
1158 char locked_message_buf[BUFLEN];
1159 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1160 if (strlen(locked_message_buf) != 0) {
1161 #ifdef PRODUCT
1162 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1163 if (ignore_unrecognized && mismatched) {
1164 return true;
1165 }
1166 #endif
1167 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1168 }
1169 if (found_flag->is_bool() && !has_plus_minus) {
1170 jio_fprintf(defaultStream::error_stream(),
1171 "Missing +/- setting for VM option '%s'\n", argname);
1172 } else if (!found_flag->is_bool() && has_plus_minus) {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "Unexpected +/- setting in VM option '%s'\n", argname);
1175 } else {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Improperly specified VM option '%s'\n", argname);
1178 }
1179 } else {
1180 if (ignore_unrecognized) {
1181 return true;
1182 }
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Unrecognized VM option '%s'\n", argname);
1185 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1186 if (fuzzy_matched != nullptr) {
1187 jio_fprintf(defaultStream::error_stream(),
1188 "Did you mean '%s%s%s'?\n",
1189 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1190 fuzzy_matched->name(),
1191 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1192 }
1193 }
1194
1195 // allow for commandline "commenting out" options like -XX:#+Verbose
1196 return arg[0] == '#';
1197 }
1198
1199 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1200 FILE* stream = os::fopen(file_name, "rb");
1201 if (stream == nullptr) {
1202 if (should_exist) {
1203 jio_fprintf(defaultStream::error_stream(),
1204 "Could not open settings file %s\n", file_name);
1205 return false;
1206 } else {
1207 return true;
1208 }
1209 }
1210
1211 char token[1024];
1212 int pos = 0;
1213
1214 bool in_white_space = true;
1215 bool in_comment = false;
1216 bool in_quote = false;
1217 int quote_c = 0;
1218 bool result = true;
1219
1220 int c = getc(stream);
1221 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1222 if (in_white_space) {
1223 if (in_comment) {
1224 if (c == '\n') in_comment = false;
1225 } else {
1226 if (c == '#') in_comment = true;
1227 else if (!isspace((unsigned char) c)) {
1228 in_white_space = false;
1229 token[pos++] = checked_cast<char>(c);
1230 }
1231 }
1232 } else {
1233 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1234 // token ends at newline, or at unquoted whitespace
1235 // this allows a way to include spaces in string-valued options
1236 token[pos] = '\0';
1237 logOption(token);
1238 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1239 build_jvm_flags(token);
1240 pos = 0;
1241 in_white_space = true;
1242 in_quote = false;
1243 } else if (!in_quote && (c == '\'' || c == '"')) {
1244 in_quote = true;
1245 quote_c = c;
1246 } else if (in_quote && (c == quote_c)) {
1247 in_quote = false;
1248 } else {
1249 token[pos++] = checked_cast<char>(c);
1250 }
1251 }
1252 c = getc(stream);
1253 }
1254 if (pos > 0) {
1255 token[pos] = '\0';
1256 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1257 build_jvm_flags(token);
1258 }
1259 fclose(stream);
1260 return result;
1261 }
1262
1263 //=============================================================================================================
1264 // Parsing of properties (-D)
1265
1266 const char* Arguments::get_property(const char* key) {
1267 return PropertyList_get_value(system_properties(), key);
1268 }
1269
1270 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1271 const char* eq = strchr(prop, '=');
1272 const char* key;
1273 const char* value = "";
1274
1275 if (eq == nullptr) {
1276 // property doesn't have a value, thus use passed string
1277 key = prop;
1278 } else {
1279 // property have a value, thus extract it and save to the
1280 // allocated string
1281 size_t key_len = eq - prop;
1282 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1283
1284 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1285 key = tmp_key;
1286
1287 value = &prop[key_len + 1];
1288 }
1289
1290 if (internal == ExternalProperty) {
1291 CDSConfig::check_incompatible_property(key, value);
1292 }
1293
1294 if (strcmp(key, "java.compiler") == 0) {
1295 // we no longer support java.compiler system property, log a warning and let it get
1296 // passed to Java, like any other system property
1297 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1298 // for applications using NONE or empty value, log a more informative message
1299 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1300 } else {
1301 warning("The java.compiler system property is obsolete and no longer supported.");
1302 }
1303 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1304 // append is true, writable is true, internal is false
1305 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1306 WriteableProperty, ExternalProperty);
1307 } else {
1308 if (strcmp(key, "sun.java.command") == 0) {
1309 char *old_java_command = _java_command;
1310 _java_command = os::strdup_check_oom(value, mtArguments);
1311 if (old_java_command != nullptr) {
1312 os::free(old_java_command);
1313 }
1314 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1315 // If this property is set on the command line then its value will be
1316 // displayed in VM error logs as the URL at which to submit such logs.
1317 // Normally the URL displayed in error logs is different from the value
1318 // of this system property, so a different property should have been
1319 // used here, but we leave this as-is in case someone depends upon it.
1320 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1321 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1322 // its value without going through the property list or making a Java call.
1323 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1324 if (old_java_vendor_url_bug != nullptr) {
1325 os::free((void *)old_java_vendor_url_bug);
1326 }
1327 }
1328
1329 // Create new property and add at the end of the list
1330 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1331 }
1332
1333 if (key != prop) {
1334 // SystemProperty copy passed value, thus free previously allocated
1335 // memory
1336 FreeHeap((void *)key);
1337 }
1338
1339 return true;
1340 }
1341
1342 //===========================================================================================================
1343 // Setting int/mixed/comp mode flags
1344
1345 void Arguments::set_mode_flags(Mode mode) {
1346 // Set up default values for all flags.
1347 // If you add a flag to any of the branches below,
1348 // add a default value for it here.
1349 _mode = mode;
1350
1351 // Ensure Agent_OnLoad has the correct initial values.
1352 // This may not be the final mode; mode may change later in onload phase.
1353 PropertyList_unique_add(&_system_properties, "java.vm.info",
1354 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1355
1356 UseInterpreter = true;
1357 UseCompiler = true;
1358 UseLoopCounter = true;
1359
1360 // Default values may be platform/compiler dependent -
1361 // use the saved values
1362 ClipInlining = Arguments::_ClipInlining;
1363 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1364 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1365 BackgroundCompilation = Arguments::_BackgroundCompilation;
1366
1367 // Change from defaults based on mode
1368 switch (mode) {
1369 default:
1370 ShouldNotReachHere();
1371 break;
1372 case _int:
1373 UseCompiler = false;
1374 UseLoopCounter = false;
1375 AlwaysCompileLoopMethods = false;
1376 UseOnStackReplacement = false;
1377 break;
1378 case _mixed:
1379 // same as default
1380 break;
1381 case _comp:
1382 UseInterpreter = false;
1383 BackgroundCompilation = false;
1384 ClipInlining = false;
1385 break;
1386 }
1387 }
1388
1389 // Conflict: required to use shared spaces (-Xshare:on), but
1390 // incompatible command line options were chosen.
1391 void Arguments::no_shared_spaces(const char* message) {
1392 if (RequireSharedSpaces) {
1393 aot_log_error(aot)("%s is incompatible with other specified options.",
1394 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1395 if (CDSConfig::new_aot_flags_used()) {
1396 vm_exit_during_initialization("Unable to use AOT cache", message);
1397 } else {
1398 vm_exit_during_initialization("Unable to use shared archive", message);
1399 }
1400 } else {
1401 if (CDSConfig::new_aot_flags_used()) {
1402 log_warning(aot)("Unable to use AOT cache: %s", message);
1403 } else {
1404 aot_log_info(aot)("Unable to use shared archive: %s", message);
1405 }
1406 UseSharedSpaces = false;
1407 }
1408 }
1409
1410 static void set_object_alignment() {
1411 // Object alignment.
1412 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1413 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1414 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1415 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1416 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1417 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1418
1419 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1420 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1421
1422 // Oop encoding heap max
1423 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1424 }
1425
1426 size_t Arguments::max_heap_for_compressed_oops() {
1427 // Avoid sign flip.
1428 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1429 // We need to fit both the null page and the heap into the memory budget, while
1430 // keeping alignment constraints of the heap. To guarantee the latter, as the
1431 // null page is located before the heap, we pad the null page to the conservative
1432 // maximum alignment that the GC may ever impose upon the heap.
1433 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1434 _conservative_max_heap_alignment);
1435
1436 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1437 NOT_LP64(ShouldNotReachHere(); return 0);
1438 }
1439
1440 void Arguments::set_use_compressed_oops() {
1441 #ifdef _LP64
1442 // MaxHeapSize is not set up properly at this point, but
1443 // the only value that can override MaxHeapSize if we are
1444 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1445 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1446
1447 if (max_heap_size <= max_heap_for_compressed_oops()) {
1448 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1449 FLAG_SET_ERGO(UseCompressedOops, true);
1450 }
1451 } else {
1452 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1453 warning("Max heap size too large for Compressed Oops");
1454 FLAG_SET_DEFAULT(UseCompressedOops, false);
1455 }
1456 }
1457 #endif // _LP64
1458 }
1459
1460 void Arguments::set_conservative_max_heap_alignment() {
1461 // The conservative maximum required alignment for the heap is the maximum of
1462 // the alignments imposed by several sources: any requirements from the heap
1463 // itself and the maximum page size we may run the VM with.
1464 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1465 _conservative_max_heap_alignment = MAX3(heap_alignment,
1466 os::vm_allocation_granularity(),
1467 os::max_page_size());
1468 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1469 }
1470
1471 jint Arguments::set_ergonomics_flags() {
1472 GCConfig::initialize();
1473
1474 set_conservative_max_heap_alignment();
1475
1476 #ifdef _LP64
1477 set_use_compressed_oops();
1478
1479 // Also checks that certain machines are slower with compressed oops
1480 // in vm_version initialization code.
1481 #endif // _LP64
1482
1483 return JNI_OK;
1484 }
1485
1486 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1487 // The AggressiveHeap check is a temporary workaround to avoid calling
1488 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1489 // selected. This works because AggressiveHeap implies UseParallelGC
1490 // where we know the ratio will be 1. Once the AggressiveHeap option is
1491 // removed, this can be cleaned up.
1492 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1493 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1494 size_t max_allocatable = os::commit_memory_limit();
1495
1496 return MIN2(limit, max_allocatable / fraction);
1497 }
1498
1499 // Use static initialization to get the default before parsing
1500 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1501
1502 static size_t clamp_by_size_t_max(uint64_t value) {
1503 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1504 }
1505
1506 void Arguments::set_heap_size() {
1507 // Check if the user has configured any limit on the amount of RAM we may use.
1508 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1509 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1510 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1511 !FLAG_IS_DEFAULT(MaxRAM);
1512
1513 if (FLAG_IS_DEFAULT(MaxRAM)) {
1514 if (CompilerConfig::should_set_client_emulation_mode_flags()) {
1515 // Limit the available memory if client emulation mode is enabled.
1516 FLAG_SET_ERGO(MaxRAM, 1ULL*G);
1517 } else {
1518 // Use the available physical memory on the system.
1519 FLAG_SET_ERGO(MaxRAM, os::physical_memory());
1520 }
1521 }
1522
1523 // If the maximum heap size has not been set with -Xmx, then set it as
1524 // fraction of the size of physical memory, respecting the maximum and
1525 // minimum sizes of the heap.
1526 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1527 uint64_t min_memory = (uint64_t)(((double)MaxRAM * MinRAMPercentage) / 100);
1528 uint64_t max_memory = (uint64_t)(((double)MaxRAM * MaxRAMPercentage) / 100);
1529
1530 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1531 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1532
1533 if (reasonable_min < MaxHeapSize) {
1534 // Small physical memory, so use a minimum fraction of it for the heap
1535 reasonable_max = reasonable_min;
1536 } else {
1537 // Not-small physical memory, so require a heap at least
1538 // as large as MaxHeapSize
1539 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1540 }
1541
1542 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1543 // Limit the heap size to ErgoHeapSizeLimit
1544 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1545 }
1546
1547 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1548
1549 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1550 // An initial heap size was specified on the command line,
1551 // so be sure that the maximum size is consistent. Done
1552 // after call to limit_heap_by_allocatable_memory because that
1553 // method might reduce the allocation size.
1554 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1555 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1556 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1557 }
1558
1559 #ifdef _LP64
1560 if (UseCompressedOops || UseCompressedClassPointers) {
1561 // HeapBaseMinAddress can be greater than default but not less than.
1562 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1563 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1564 // matches compressed oops printing flags
1565 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1566 "(%zuG) which is greater than value given %zu",
1567 DefaultHeapBaseMinAddress,
1568 DefaultHeapBaseMinAddress/G,
1569 HeapBaseMinAddress);
1570 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1571 }
1572 }
1573 }
1574
1575 if (UseCompressedOops) {
1576 uintptr_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1577 uintptr_t max_coop_heap = max_heap_for_compressed_oops();
1578
1579 // Limit the heap size to the maximum possible when using compressed oops
1580 if (heap_end < max_coop_heap) {
1581 // Heap should be above HeapBaseMinAddress to get zero based compressed
1582 // oops but it should be not less than default MaxHeapSize.
1583 max_coop_heap -= HeapBaseMinAddress;
1584 }
1585
1586 // If the user has configured any limit on the amount of RAM we may use,
1587 // then disable compressed oops if the calculated max exceeds max_coop_heap
1588 // and UseCompressedOops was not specified.
1589 if (reasonable_max > max_coop_heap) {
1590 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1591 log_debug(gc, heap, coops)("UseCompressedOops disabled due to "
1592 "max heap %zu > compressed oop heap %zu. "
1593 "Please check the setting of MaxRAMPercentage %5.2f.",
1594 reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1595 FLAG_SET_ERGO(UseCompressedOops, false);
1596 } else {
1597 reasonable_max = max_coop_heap;
1598 }
1599 }
1600 }
1601 #endif // _LP64
1602
1603 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1604 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1605 }
1606
1607 // If the minimum or initial heap_size have not been set or requested to be set
1608 // ergonomically, set them accordingly.
1609 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1610 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1611 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1612 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1613
1614 if (InitialHeapSize == 0) {
1615 uint64_t initial_memory = (uint64_t)(((double)MaxRAM * InitialRAMPercentage) / 100);
1616 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1617 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1618
1619 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1620 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1621
1622 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1623 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1624 }
1625
1626 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1627 // synchronize with InitialHeapSize to avoid errors with the default value.
1628 if (MinHeapSize == 0) {
1629 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1630 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1631 }
1632 }
1633 }
1634
1635 // This option inspects the machine and attempts to set various
1636 // parameters to be optimal for long-running, memory allocation
1637 // intensive jobs. It is intended for machines with large
1638 // amounts of cpu and memory.
1639 jint Arguments::set_aggressive_heap_flags() {
1640 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1641 // VM, but we may not be able to represent the total physical memory
1642 // available (like having 8gb of memory on a box but using a 32bit VM).
1643 // Thus, we need to make sure we're using a julong for intermediate
1644 // calculations.
1645 julong initHeapSize;
1646 physical_memory_size_type phys_mem = os::physical_memory();
1647 julong total_memory = static_cast<julong>(phys_mem);
1648
1649 if (total_memory < (julong) 256 * M) {
1650 jio_fprintf(defaultStream::error_stream(),
1651 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1652 vm_exit(1);
1653 }
1654
1655 // The heap size is half of available memory, or (at most)
1656 // all of possible memory less 160mb (leaving room for the OS
1657 // when using ISM). This is the maximum; because adaptive sizing
1658 // is turned on below, the actual space used may be smaller.
1659
1660 initHeapSize = MIN2(total_memory / (julong) 2,
1661 total_memory - (julong) 160 * M);
1662
1663 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1664
1665 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1666 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1667 return JNI_EINVAL;
1668 }
1669 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1673 return JNI_EINVAL;
1674 }
1675 }
1676 if (FLAG_IS_DEFAULT(NewSize)) {
1677 // Make the young generation 3/8ths of the total heap.
1678 if (FLAG_SET_CMDLINE(NewSize,
1679 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1680 return JNI_EINVAL;
1681 }
1682 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1683 return JNI_EINVAL;
1684 }
1685 }
1686
1687 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1688 FLAG_SET_DEFAULT(UseLargePages, true);
1689 #endif
1690
1691 // Increase some data structure sizes for efficiency
1692 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1693 return JNI_EINVAL;
1694 }
1695 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1696 return JNI_EINVAL;
1697 }
1698
1699 // See the OldPLABSize comment below, but replace 'after promotion'
1700 // with 'after copying'. YoungPLABSize is the size of the survivor
1701 // space per-gc-thread buffers. The default is 4kw.
1702 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1703 return JNI_EINVAL;
1704 }
1705
1706 // OldPLABSize is the size of the buffers in the old gen that
1707 // UseParallelGC uses to promote live data that doesn't fit in the
1708 // survivor spaces. At any given time, there's one for each gc thread.
1709 // The default size is 1kw. These buffers are rarely used, since the
1710 // survivor spaces are usually big enough. For specjbb, however, there
1711 // are occasions when there's lots of live data in the young gen
1712 // and we end up promoting some of it. We don't have a definite
1713 // explanation for why bumping OldPLABSize helps, but the theory
1714 // is that a bigger PLAB results in retaining something like the
1715 // original allocation order after promotion, which improves mutator
1716 // locality. A minor effect may be that larger PLABs reduce the
1717 // number of PLAB allocation events during gc. The value of 8kw
1718 // was arrived at by experimenting with specjbb.
1719 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1720 return JNI_EINVAL;
1721 }
1722
1723 // Enable parallel GC and adaptive generation sizing
1724 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1725 return JNI_EINVAL;
1726 }
1727
1728 // Encourage steady state memory management
1729 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1730 return JNI_EINVAL;
1731 }
1732
1733 return JNI_OK;
1734 }
1735
1736 // This must be called after ergonomics.
1737 void Arguments::set_bytecode_flags() {
1738 if (!RewriteBytecodes) {
1739 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1740 }
1741 }
1742
1743 // Aggressive optimization flags
1744 jint Arguments::set_aggressive_opts_flags() {
1745 #ifdef COMPILER2
1746 if (AggressiveUnboxing) {
1747 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1748 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1749 } else if (!EliminateAutoBox) {
1750 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1751 AggressiveUnboxing = false;
1752 }
1753 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1754 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1755 } else if (!DoEscapeAnalysis) {
1756 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1757 AggressiveUnboxing = false;
1758 }
1759 }
1760 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1761 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1762 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1763 }
1764 // Feed the cache size setting into the JDK
1765 char buffer[1024];
1766 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1767 if (!add_property(buffer)) {
1768 return JNI_ENOMEM;
1769 }
1770 }
1771 #endif
1772
1773 return JNI_OK;
1774 }
1775
1776 //===========================================================================================================
1777
1778 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1779 if (_sun_java_launcher != _default_java_launcher) {
1780 os::free(const_cast<char*>(_sun_java_launcher));
1781 }
1782 _sun_java_launcher = os::strdup_check_oom(launcher);
1783 }
1784
1785 bool Arguments::created_by_java_launcher() {
1786 assert(_sun_java_launcher != nullptr, "property must have value");
1787 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1788 }
1789
1790 bool Arguments::executing_unit_tests() {
1791 return _executing_unit_tests;
1792 }
1793
1794 //===========================================================================================================
1795 // Parsing of main arguments
1796
1797 static unsigned int addreads_count = 0;
1798 static unsigned int addexports_count = 0;
1799 static unsigned int addopens_count = 0;
1800 static unsigned int enable_native_access_count = 0;
1801 static unsigned int enable_final_field_mutation = 0;
1802 static bool patch_mod_javabase = false;
1803
1804 // Check the consistency of vm_init_args
1805 bool Arguments::check_vm_args_consistency() {
1806 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1807 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
1808 return false;
1809 }
1810
1811 // Method for adding checks for flag consistency.
1812 // The intent is to warn the user of all possible conflicts,
1813 // before returning an error.
1814 // Note: Needs platform-dependent factoring.
1815 bool status = true;
1816
1817 if (TLABRefillWasteFraction == 0) {
1818 jio_fprintf(defaultStream::error_stream(),
1819 "TLABRefillWasteFraction should be a denominator, "
1820 "not %zu\n",
1821 TLABRefillWasteFraction);
1822 status = false;
1823 }
1824
1825 status = CompilerConfig::check_args_consistency(status);
1826 #if INCLUDE_JVMCI
1827 if (status && EnableJVMCI) {
1828 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1829 // was explicitly set on the command line or in the jimage.
1830 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1831 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1832 return false;
1833 }
1834 }
1835 }
1836 #endif
1837
1838 #if INCLUDE_JFR
1839 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1840 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1841 return false;
1842 }
1843 }
1844 #endif
1845
1846 #ifndef SUPPORT_RESERVED_STACK_AREA
1847 if (StackReservedPages != 0) {
1848 FLAG_SET_CMDLINE(StackReservedPages, 0);
1849 warning("Reserved Stack Area not supported on this platform");
1850 }
1851 #endif
1852
1853 return status;
1854 }
1855
1856 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1857 const char* option_type) {
1858 if (ignore) return false;
1859
1860 const char* spacer = " ";
1861 if (option_type == nullptr) {
1862 option_type = ++spacer; // Set both to the empty string.
1863 }
1864
1865 jio_fprintf(defaultStream::error_stream(),
1866 "Unrecognized %s%soption: %s\n", option_type, spacer,
1867 option->optionString);
1868 return true;
1869 }
1870
1871 static const char* user_assertion_options[] = {
1872 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1873 };
1874
1875 static const char* system_assertion_options[] = {
1876 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1877 };
1878
1879 bool Arguments::parse_uint(const char* value,
1880 uint* uint_arg,
1881 uint min_size) {
1882 uint n;
1883 if (!parse_integer(value, &n)) {
1884 return false;
1885 }
1886 if (n >= min_size) {
1887 *uint_arg = n;
1888 return true;
1889 } else {
1890 return false;
1891 }
1892 }
1893
1894 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1895 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1896 CDSConfig::check_internal_module_property(prop_name, prop_value);
1897 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1898 char* property = AllocateHeap(prop_len, mtArguments);
1899 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1900 if (ret < 0 || ret >= (int)prop_len) {
1901 FreeHeap(property);
1902 return false;
1903 }
1904 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1905 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1906 // that multiple occurrences of the associated flag just causes the existing property value to be
1907 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1908 // to a property after we have finished flag processing.
1909 bool added = add_property(property, WriteableProperty, internal);
1910 FreeHeap(property);
1911 return added;
1912 }
1913
1914 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1915 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1916 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1917 const unsigned int props_count_limit = 1000;
1918 const int max_digits = 3;
1919 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1920
1921 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1922 if (count < props_count_limit) {
1923 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1924 char* property = AllocateHeap(prop_len, mtArguments);
1925 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1926 if (ret < 0 || ret >= (int)prop_len) {
1927 FreeHeap(property);
1928 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1929 return false;
1930 }
1931 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1932 FreeHeap(property);
1933 return added;
1934 }
1935
1936 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1937 return false;
1938 }
1939
1940 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1941 julong* long_arg,
1942 julong min_size,
1943 julong max_size) {
1944 if (!parse_integer(s, long_arg)) return arg_unreadable;
1945 return check_memory_size(*long_arg, min_size, max_size);
1946 }
1947
1948 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1949 // Save default settings for some mode flags
1950 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1951 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1952 Arguments::_ClipInlining = ClipInlining;
1953 Arguments::_BackgroundCompilation = BackgroundCompilation;
1954
1955 // Remember the default value of SharedBaseAddress.
1956 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1957
1958 // Setup flags for mixed which is the default
1959 set_mode_flags(_mixed);
1960
1961 jint result;
1962 for (int i = 0; i < all_args->length(); i++) {
1963 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1964 if (result != JNI_OK) {
1965 return result;
1966 }
1967 }
1968
1969 // Disable CDS for exploded image
1970 if (!has_jimage()) {
1971 no_shared_spaces("CDS disabled on exploded JDK");
1972 }
1973
1974 if (UseAltSubstitutabilityMethod) {
1975 no_shared_spaces("Alternate substitutability method doesn't work with CDS yet");
1976 }
1977
1978 // We need to ensure processor and memory resources have been properly
1979 // configured - which may rely on arguments we just processed - before
1980 // doing the final argument processing. Any argument processing that
1981 // needs to know about processor and memory resources must occur after
1982 // this point.
1983
1984 os::init_container_support();
1985
1986 SystemMemoryBarrier::initialize();
1987
1988 // Do final processing now that all arguments have been parsed
1989 result = finalize_vm_init_args();
1990 if (result != JNI_OK) {
1991 return result;
1992 }
1993
1994 return JNI_OK;
1995 }
1996
1997 #if !INCLUDE_JVMTI || INCLUDE_CDS
1998 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1999 // represents a valid JDWP agent. is_path==true denotes that we
2000 // are dealing with -agentpath (case where name is a path), otherwise with
2001 // -agentlib
2002 static bool valid_jdwp_agent(char *name, bool is_path) {
2003 char *_name;
2004 const char *_jdwp = "jdwp";
2005 size_t _len_jdwp, _len_prefix;
2006
2007 if (is_path) {
2008 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2009 return false;
2010 }
2011
2012 _name++; // skip past last path separator
2013 _len_prefix = strlen(JNI_LIB_PREFIX);
2014
2015 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2016 return false;
2017 }
2018
2019 _name += _len_prefix;
2020 _len_jdwp = strlen(_jdwp);
2021
2022 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2023 _name += _len_jdwp;
2024 }
2025 else {
2026 return false;
2027 }
2028
2029 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2030 return false;
2031 }
2032
2033 return true;
2034 }
2035
2036 if (strcmp(name, _jdwp) == 0) {
2037 return true;
2038 }
2039
2040 return false;
2041 }
2042 #endif
2043
2044 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2045 // --patch-module=<module>=<file>(<pathsep><file>)*
2046 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2047 // Find the equal sign between the module name and the path specification
2048 const char* module_equal = strchr(patch_mod_tail, '=');
2049 if (module_equal == nullptr) {
2050 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2051 return JNI_ERR;
2052 } else {
2053 // Pick out the module name
2054 size_t module_len = module_equal - patch_mod_tail;
2055 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2056 if (module_name != nullptr) {
2057 memcpy(module_name, patch_mod_tail, module_len);
2058 *(module_name + module_len) = '\0';
2059 // The path piece begins one past the module_equal sign
2060 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2061 FREE_C_HEAP_ARRAY(char, module_name);
2062 } else {
2063 return JNI_ENOMEM;
2064 }
2065 }
2066 return JNI_OK;
2067 }
2068
2069 // Finalize --patch-module args and --enable-preview related to value class module patches.
2070 // Create all numbered properties passing module patches.
2071 int Arguments::finalize_patch_module() {
2072 // Create numbered properties for each module that has been patched by --patch-module.
2073 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2074 if (_patch_mod_prefix != nullptr) {
2075 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2076 unsigned int patch_mod_count = 0;
2077
2078 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2079 it != _patch_mod_prefix->end(); ++it) {
2080 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2081 (*it)->module_name(), (*it)->path_string());
2082 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2083 FreeHeap(prop_value);
2084 return JNI_ENOMEM;
2085 }
2086 }
2087 FreeHeap(prop_value);
2088 }
2089 return JNI_OK;
2090 }
2091
2092 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2093 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2094 // The min and max sizes match the values in globals.hpp, but scaled
2095 // with K. The values have been chosen so that alignment with page
2096 // size doesn't change the max value, which makes the conversions
2097 // back and forth between Xss value and ThreadStackSize value easier.
2098 // The values have also been chosen to fit inside a 32-bit signed type.
2099 const julong min_ThreadStackSize = 0;
2100 const julong max_ThreadStackSize = 1 * M;
2101
2102 // Make sure the above values match the range set in globals.hpp
2103 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2104 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2105 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2106
2107 const julong min_size = min_ThreadStackSize * K;
2108 const julong max_size = max_ThreadStackSize * K;
2109
2110 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2111
2112 julong size = 0;
2113 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2114 if (errcode != arg_in_range) {
2115 bool silent = (option == nullptr); // Allow testing to silence error messages
2116 if (!silent) {
2117 jio_fprintf(defaultStream::error_stream(),
2118 "Invalid thread stack size: %s\n", option->optionString);
2119 describe_range_error(errcode);
2120 }
2121 return JNI_EINVAL;
2122 }
2123
2124 // Internally track ThreadStackSize in units of 1024 bytes.
2125 const julong size_aligned = align_up(size, K);
2126 assert(size <= size_aligned,
2127 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2128 size, size_aligned);
2129
2130 const julong size_in_K = size_aligned / K;
2131 assert(size_in_K < (julong)max_intx,
2132 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2133 size_in_K);
2134
2135 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2136 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2137 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2138 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2139 max_expanded, size_in_K);
2140
2141 *out_ThreadStackSize = (intx)size_in_K;
2142
2143 return JNI_OK;
2144 }
2145
2146 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2147 // For match_option to return remaining or value part of option string
2148 const char* tail;
2149
2150 // iterate over arguments
2151 for (int index = 0; index < args->nOptions; index++) {
2152 bool is_absolute_path = false; // for -agentpath vs -agentlib
2153
2154 const JavaVMOption* option = args->options + index;
2155
2156 if (!match_option(option, "-Djava.class.path", &tail) &&
2157 !match_option(option, "-Dsun.java.command", &tail) &&
2158 !match_option(option, "-Dsun.java.launcher", &tail)) {
2159
2160 // add all jvm options to the jvm_args string. This string
2161 // is used later to set the java.vm.args PerfData string constant.
2162 // the -Djava.class.path and the -Dsun.java.command options are
2163 // omitted from jvm_args string as each have their own PerfData
2164 // string constant object.
2165 build_jvm_args(option->optionString);
2166 }
2167
2168 // -verbose:[class/module/gc/jni]
2169 if (match_option(option, "-verbose", &tail)) {
2170 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2171 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2172 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2173 } else if (!strcmp(tail, ":module")) {
2174 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2175 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2176 } else if (!strcmp(tail, ":gc")) {
2177 if (_legacyGCLogging.lastFlag == 0) {
2178 _legacyGCLogging.lastFlag = 1;
2179 }
2180 } else if (!strcmp(tail, ":jni")) {
2181 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2182 }
2183 // -da / -ea / -disableassertions / -enableassertions
2184 // These accept an optional class/package name separated by a colon, e.g.,
2185 // -da:java.lang.Thread.
2186 } else if (match_option(option, user_assertion_options, &tail, true)) {
2187 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2188 if (*tail == '\0') {
2189 JavaAssertions::setUserClassDefault(enable);
2190 } else {
2191 assert(*tail == ':', "bogus match by match_option()");
2192 JavaAssertions::addOption(tail + 1, enable);
2193 }
2194 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2195 } else if (match_option(option, system_assertion_options, &tail, false)) {
2196 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2197 JavaAssertions::setSystemClassDefault(enable);
2198 // -bootclasspath:
2199 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2200 jio_fprintf(defaultStream::output_stream(),
2201 "-Xbootclasspath is no longer a supported option.\n");
2202 return JNI_EINVAL;
2203 // -bootclasspath/a:
2204 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2205 Arguments::append_sysclasspath(tail);
2206 // -bootclasspath/p:
2207 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2208 jio_fprintf(defaultStream::output_stream(),
2209 "-Xbootclasspath/p is no longer a supported option.\n");
2210 return JNI_EINVAL;
2211 // -Xrun
2212 } else if (match_option(option, "-Xrun", &tail)) {
2213 if (tail != nullptr) {
2214 const char* pos = strchr(tail, ':');
2215 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2216 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2217 jio_snprintf(name, len + 1, "%s", tail);
2218
2219 char *options = nullptr;
2220 if(pos != nullptr) {
2221 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2222 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2223 }
2224 #if !INCLUDE_JVMTI
2225 if (strcmp(name, "jdwp") == 0) {
2226 jio_fprintf(defaultStream::error_stream(),
2227 "Debugging agents are not supported in this VM\n");
2228 return JNI_ERR;
2229 }
2230 #endif // !INCLUDE_JVMTI
2231 JvmtiAgentList::add_xrun(name, options, false);
2232 FREE_C_HEAP_ARRAY(char, name);
2233 FREE_C_HEAP_ARRAY(char, options);
2234 }
2235 } else if (match_option(option, "--add-reads=", &tail)) {
2236 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2237 return JNI_ENOMEM;
2238 }
2239 } else if (match_option(option, "--add-exports=", &tail)) {
2240 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2241 return JNI_ENOMEM;
2242 }
2243 } else if (match_option(option, "--add-opens=", &tail)) {
2244 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2245 return JNI_ENOMEM;
2246 }
2247 } else if (match_option(option, "--add-modules=", &tail)) {
2248 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2249 return JNI_ENOMEM;
2250 }
2251 #if INCLUDE_JVMCI
2252 if (!_jvmci_module_added) {
2253 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2254 if (jvmci_module != nullptr) {
2255 char before = *(jvmci_module - 1);
2256 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2257 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2258 FLAG_SET_DEFAULT(EnableJVMCI, true);
2259 _jvmci_module_added = true;
2260 }
2261 }
2262 }
2263 #endif
2264 } else if (match_option(option, "--enable-native-access=", &tail)) {
2265 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2266 return JNI_ENOMEM;
2267 }
2268 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2269 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2270 return JNI_ENOMEM;
2271 }
2272 } else if (match_option(option, "--limit-modules=", &tail)) {
2273 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2274 return JNI_ENOMEM;
2275 }
2276 } else if (match_option(option, "--module-path=", &tail)) {
2277 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2278 return JNI_ENOMEM;
2279 }
2280 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2281 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2282 return JNI_ENOMEM;
2283 }
2284 } else if (match_option(option, "--patch-module=", &tail)) {
2285 // --patch-module=<module>=<file>(<pathsep><file>)*
2286 int res = process_patch_mod_option(tail);
2287 if (res != JNI_OK) {
2288 return res;
2289 }
2290 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2291 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2292 return JNI_ENOMEM;
2293 }
2294 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2295 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2296 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2297 AddProperty, WriteableProperty, InternalProperty);
2298 } else {
2299 jio_fprintf(defaultStream::error_stream(),
2300 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2301 return JNI_ERR;
2302 }
2303 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2304 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2305 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2306 AddProperty, WriteableProperty, InternalProperty);
2307 } else {
2308 jio_fprintf(defaultStream::error_stream(),
2309 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2310 return JNI_ERR;
2311 }
2312 } else if (match_option(option, "--illegal-access=", &tail)) {
2313 char version[256];
2314 JDK_Version::jdk(17).to_string(version, sizeof(version));
2315 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2316 // -agentlib and -agentpath
2317 } else if (match_option(option, "-agentlib:", &tail) ||
2318 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2319 if(tail != nullptr) {
2320 const char* pos = strchr(tail, '=');
2321 char* name;
2322 if (pos == nullptr) {
2323 name = os::strdup_check_oom(tail, mtArguments);
2324 } else {
2325 size_t len = pos - tail;
2326 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2327 memcpy(name, tail, len);
2328 name[len] = '\0';
2329 }
2330
2331 char *options = nullptr;
2332 if(pos != nullptr) {
2333 options = os::strdup_check_oom(pos + 1, mtArguments);
2334 }
2335 #if !INCLUDE_JVMTI
2336 if (valid_jdwp_agent(name, is_absolute_path)) {
2337 jio_fprintf(defaultStream::error_stream(),
2338 "Debugging agents are not supported in this VM\n");
2339 return JNI_ERR;
2340 }
2341 #elif INCLUDE_CDS
2342 if (valid_jdwp_agent(name, is_absolute_path)) {
2343 _has_jdwp_agent = true;
2344 }
2345 #endif // !INCLUDE_JVMTI
2346 JvmtiAgentList::add(name, options, is_absolute_path);
2347 os::free(name);
2348 os::free(options);
2349 }
2350 // -javaagent
2351 } else if (match_option(option, "-javaagent:", &tail)) {
2352 #if !INCLUDE_JVMTI
2353 jio_fprintf(defaultStream::error_stream(),
2354 "Instrumentation agents are not supported in this VM\n");
2355 return JNI_ERR;
2356 #else
2357 if (tail != nullptr) {
2358 size_t length = strlen(tail) + 1;
2359 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2360 jio_snprintf(options, length, "%s", tail);
2361 JvmtiAgentList::add("instrument", options, false);
2362 FREE_C_HEAP_ARRAY(char, options);
2363
2364 // java agents need module java.instrument
2365 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2366 return JNI_ENOMEM;
2367 }
2368 }
2369 #endif // !INCLUDE_JVMTI
2370 // --enable_preview
2371 } else if (match_option(option, "--enable-preview")) {
2372 set_enable_preview();
2373 // -Xnoclassgc
2374 } else if (match_option(option, "-Xnoclassgc")) {
2375 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2376 return JNI_EINVAL;
2377 }
2378 // -Xbatch
2379 } else if (match_option(option, "-Xbatch")) {
2380 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2381 return JNI_EINVAL;
2382 }
2383 // -Xmn for compatibility with other JVM vendors
2384 } else if (match_option(option, "-Xmn", &tail)) {
2385 julong long_initial_young_size = 0;
2386 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2387 if (errcode != arg_in_range) {
2388 jio_fprintf(defaultStream::error_stream(),
2389 "Invalid initial young generation size: %s\n", option->optionString);
2390 describe_range_error(errcode);
2391 return JNI_EINVAL;
2392 }
2393 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2394 return JNI_EINVAL;
2395 }
2396 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2397 return JNI_EINVAL;
2398 }
2399 // -Xms
2400 } else if (match_option(option, "-Xms", &tail)) {
2401 julong size = 0;
2402 // an initial heap size of 0 means automatically determine
2403 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2404 if (errcode != arg_in_range) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "Invalid initial heap size: %s\n", option->optionString);
2407 describe_range_error(errcode);
2408 return JNI_EINVAL;
2409 }
2410 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2411 return JNI_EINVAL;
2412 }
2413 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2414 return JNI_EINVAL;
2415 }
2416 // -Xmx
2417 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2418 julong long_max_heap_size = 0;
2419 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2420 if (errcode != arg_in_range) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "Invalid maximum heap size: %s\n", option->optionString);
2423 describe_range_error(errcode);
2424 return JNI_EINVAL;
2425 }
2426 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2427 return JNI_EINVAL;
2428 }
2429 // Xmaxf
2430 } else if (match_option(option, "-Xmaxf", &tail)) {
2431 char* err;
2432 double dmaxf = strtod(tail, &err);
2433 if (*err != '\0' || *tail == '\0') {
2434 jio_fprintf(defaultStream::error_stream(),
2435 "Bad max heap free ratio: %s\n",
2436 option->optionString);
2437 return JNI_EINVAL;
2438 }
2439 if (dmaxf < 0.0 || dmaxf > 1.0) {
2440 jio_fprintf(defaultStream::error_stream(),
2441 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2442 option->optionString);
2443 return JNI_EINVAL;
2444 }
2445 const uintx umaxf = (uintx)(dmaxf * 100);
2446 if (MinHeapFreeRatio > umaxf) {
2447 jio_fprintf(defaultStream::error_stream(),
2448 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2449 tail, MinHeapFreeRatio / 100.0f);
2450 return JNI_EINVAL;
2451 }
2452 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2453 return JNI_EINVAL;
2454 }
2455 // Xminf
2456 } else if (match_option(option, "-Xminf", &tail)) {
2457 char* err;
2458 double dminf = strtod(tail, &err);
2459 if (*err != '\0' || *tail == '\0') {
2460 jio_fprintf(defaultStream::error_stream(),
2461 "Bad min heap free ratio: %s\n",
2462 option->optionString);
2463 return JNI_EINVAL;
2464 }
2465 if (dminf < 0.0 || dminf > 1.0) {
2466 jio_fprintf(defaultStream::error_stream(),
2467 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2468 tail);
2469 return JNI_EINVAL;
2470 }
2471 const uintx uminf = (uintx)(dminf * 100);
2472 if (MaxHeapFreeRatio < uminf) {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2475 tail, MaxHeapFreeRatio / 100.0f);
2476 return JNI_EINVAL;
2477 }
2478 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2479 return JNI_EINVAL;
2480 }
2481 // -Xss
2482 } else if (match_option(option, "-Xss", &tail)) {
2483 intx value = 0;
2484 jint err = parse_xss(option, tail, &value);
2485 if (err != JNI_OK) {
2486 return err;
2487 }
2488 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2489 return JNI_EINVAL;
2490 }
2491 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2492 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2493 if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2494 warning("Option -Xmaxjitcodesize was deprecated in JDK 26 and will likely be removed in a future release.");
2495 }
2496 julong long_ReservedCodeCacheSize = 0;
2497
2498 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2499 if (errcode != arg_in_range) {
2500 jio_fprintf(defaultStream::error_stream(),
2501 "Invalid maximum code cache size: %s.\n", option->optionString);
2502 return JNI_EINVAL;
2503 }
2504 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2505 return JNI_EINVAL;
2506 }
2507 // -green
2508 } else if (match_option(option, "-green")) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Green threads support not available\n");
2511 return JNI_EINVAL;
2512 // -native
2513 } else if (match_option(option, "-native")) {
2514 // HotSpot always uses native threads, ignore silently for compatibility
2515 // -Xrs
2516 } else if (match_option(option, "-Xrs")) {
2517 // Classic/EVM option, new functionality
2518 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2519 return JNI_EINVAL;
2520 }
2521 // -Xprof
2522 } else if (match_option(option, "-Xprof")) {
2523 char version[256];
2524 // Obsolete in JDK 10
2525 JDK_Version::jdk(10).to_string(version, sizeof(version));
2526 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2527 // -Xinternalversion
2528 } else if (match_option(option, "-Xinternalversion")) {
2529 jio_fprintf(defaultStream::output_stream(), "%s\n",
2530 VM_Version::internal_vm_info_string());
2531 vm_exit(0);
2532 #ifndef PRODUCT
2533 // -Xprintflags
2534 } else if (match_option(option, "-Xprintflags")) {
2535 JVMFlag::printFlags(tty, false);
2536 vm_exit(0);
2537 #endif
2538 // -D
2539 } else if (match_option(option, "-D", &tail)) {
2540 const char* value;
2541 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2542 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2543 // abort if -Djava.endorsed.dirs is set
2544 jio_fprintf(defaultStream::output_stream(),
2545 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2546 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2547 return JNI_EINVAL;
2548 }
2549 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2550 *value != '\0' && strcmp(value, "\"\"") != 0) {
2551 // abort if -Djava.ext.dirs is set
2552 jio_fprintf(defaultStream::output_stream(),
2553 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2554 return JNI_EINVAL;
2555 }
2556 // Check for module related properties. They must be set using the modules
2557 // options. For example: use "--add-modules=java.sql", not
2558 // "-Djdk.module.addmods=java.sql"
2559 if (is_internal_module_property(option->optionString + 2)) {
2560 needs_module_property_warning = true;
2561 continue;
2562 }
2563 if (!add_property(tail)) {
2564 return JNI_ENOMEM;
2565 }
2566 // Out of the box management support
2567 if (match_option(option, "-Dcom.sun.management", &tail)) {
2568 #if INCLUDE_MANAGEMENT
2569 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2570 return JNI_EINVAL;
2571 }
2572 // management agent in module jdk.management.agent
2573 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2574 return JNI_ENOMEM;
2575 }
2576 #else
2577 jio_fprintf(defaultStream::output_stream(),
2578 "-Dcom.sun.management is not supported in this VM.\n");
2579 return JNI_ERR;
2580 #endif
2581 }
2582 // -Xint
2583 } else if (match_option(option, "-Xint")) {
2584 set_mode_flags(_int);
2585 mode_flag_cmd_line = true;
2586 // -Xmixed
2587 } else if (match_option(option, "-Xmixed")) {
2588 set_mode_flags(_mixed);
2589 mode_flag_cmd_line = true;
2590 // -Xcomp
2591 } else if (match_option(option, "-Xcomp")) {
2592 // for testing the compiler; turn off all flags that inhibit compilation
2593 set_mode_flags(_comp);
2594 mode_flag_cmd_line = true;
2595 // -Xshare:dump
2596 } else if (match_option(option, "-Xshare:dump")) {
2597 CDSConfig::enable_dumping_static_archive();
2598 CDSConfig::set_old_cds_flags_used();
2599 // -Xshare:on
2600 } else if (match_option(option, "-Xshare:on")) {
2601 UseSharedSpaces = true;
2602 RequireSharedSpaces = true;
2603 CDSConfig::set_old_cds_flags_used();
2604 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2605 } else if (match_option(option, "-Xshare:auto")) {
2606 UseSharedSpaces = true;
2607 RequireSharedSpaces = false;
2608 xshare_auto_cmd_line = true;
2609 CDSConfig::set_old_cds_flags_used();
2610 // -Xshare:off
2611 } else if (match_option(option, "-Xshare:off")) {
2612 UseSharedSpaces = false;
2613 RequireSharedSpaces = false;
2614 CDSConfig::set_old_cds_flags_used();
2615 // -Xverify
2616 } else if (match_option(option, "-Xverify", &tail)) {
2617 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2618 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2619 return JNI_EINVAL;
2620 }
2621 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2622 return JNI_EINVAL;
2623 }
2624 } else if (strcmp(tail, ":remote") == 0) {
2625 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2626 return JNI_EINVAL;
2627 }
2628 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2629 return JNI_EINVAL;
2630 }
2631 } else if (strcmp(tail, ":none") == 0) {
2632 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2633 return JNI_EINVAL;
2634 }
2635 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2636 return JNI_EINVAL;
2637 }
2638 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2639 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2640 return JNI_EINVAL;
2641 }
2642 // -Xdebug
2643 } else if (match_option(option, "-Xdebug")) {
2644 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2645 } else if (match_option(option, "-Xloggc:", &tail)) {
2646 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2647 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2648 _legacyGCLogging.lastFlag = 2;
2649 _legacyGCLogging.file = os::strdup_check_oom(tail);
2650 } else if (match_option(option, "-Xlog", &tail)) {
2651 bool ret = false;
2652 if (strcmp(tail, ":help") == 0) {
2653 fileStream stream(defaultStream::output_stream());
2654 LogConfiguration::print_command_line_help(&stream);
2655 vm_exit(0);
2656 } else if (strcmp(tail, ":disable") == 0) {
2657 LogConfiguration::disable_logging();
2658 ret = true;
2659 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2660 const char* async_tail = tail + strlen(":async");
2661 ret = LogConfiguration::parse_async_argument(async_tail);
2662 } else if (*tail == '\0') {
2663 ret = LogConfiguration::parse_command_line_arguments();
2664 assert(ret, "-Xlog without arguments should never fail to parse");
2665 } else if (*tail == ':') {
2666 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2667 }
2668 if (ret == false) {
2669 jio_fprintf(defaultStream::error_stream(),
2670 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2671 tail);
2672 return JNI_EINVAL;
2673 }
2674 // JNI hooks
2675 } else if (match_option(option, "-Xcheck", &tail)) {
2676 if (!strcmp(tail, ":jni")) {
2677 #if !INCLUDE_JNI_CHECK
2678 warning("JNI CHECKING is not supported in this VM");
2679 #else
2680 CheckJNICalls = true;
2681 #endif // INCLUDE_JNI_CHECK
2682 } else if (is_bad_option(option, args->ignoreUnrecognized,
2683 "check")) {
2684 return JNI_EINVAL;
2685 }
2686 } else if (match_option(option, "vfprintf")) {
2687 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2688 } else if (match_option(option, "exit")) {
2689 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2690 } else if (match_option(option, "abort")) {
2691 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2692 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2693 // and the last option wins.
2694 } else if (match_option(option, "-XX:+NeverTenure")) {
2695 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2699 return JNI_EINVAL;
2700 }
2701 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2705 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2715 uint max_tenuring_thresh = 0;
2716 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2717 jio_fprintf(defaultStream::error_stream(),
2718 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2719 return JNI_EINVAL;
2720 }
2721
2722 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725
2726 if (MaxTenuringThreshold == 0) {
2727 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 } else {
2734 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2735 return JNI_EINVAL;
2736 }
2737 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2738 return JNI_EINVAL;
2739 }
2740 }
2741 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2742 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2743 return JNI_EINVAL;
2744 }
2745 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2746 return JNI_EINVAL;
2747 }
2748 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2749 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2756 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2763 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 } else if (match_option(option, "--finalization=", &tail)) {
2770 if (strcmp(tail, "enabled") == 0) {
2771 InstanceKlass::set_finalization_enabled(true);
2772 } else if (strcmp(tail, "disabled") == 0) {
2773 InstanceKlass::set_finalization_enabled(false);
2774 } else {
2775 jio_fprintf(defaultStream::error_stream(),
2776 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2777 tail);
2778 return JNI_EINVAL;
2779 }
2780 #if !defined(DTRACE_ENABLED)
2781 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "DTraceMethodProbes flag is not applicable for this configuration\n");
2784 return JNI_EINVAL;
2785 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "DTraceAllocProbes flag is not applicable for this configuration\n");
2788 return JNI_EINVAL;
2789 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2790 jio_fprintf(defaultStream::error_stream(),
2791 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2792 return JNI_EINVAL;
2793 #endif // !defined(DTRACE_ENABLED)
2794 #ifdef ASSERT
2795 } else if (match_option(option, "-XX:+FullGCALot")) {
2796 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2797 return JNI_EINVAL;
2798 }
2799 #endif
2800 #if !INCLUDE_MANAGEMENT
2801 } else if (match_option(option, "-XX:+ManagementServer")) {
2802 jio_fprintf(defaultStream::error_stream(),
2803 "ManagementServer is not supported in this VM.\n");
2804 return JNI_ERR;
2805 #endif // INCLUDE_MANAGEMENT
2806 #if INCLUDE_JVMCI
2807 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2808 if (EnableJVMCIProduct) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2811 return JNI_EINVAL;
2812 }
2813 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2814 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2815 if (use_graal_jit) {
2816 const char* jvmci_compiler = get_property("jvmci.Compiler");
2817 if (jvmci_compiler != nullptr) {
2818 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2819 jio_fprintf(defaultStream::error_stream(),
2820 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2821 return JNI_ERR;
2822 }
2823 } else if (!add_property("jvmci.Compiler=graal")) {
2824 return JNI_ENOMEM;
2825 }
2826 }
2827
2828 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2829 if (EnableJVMCIProduct) {
2830 continue;
2831 }
2832 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2833 // Allow this flag if it has been unlocked.
2834 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2835 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2836 jio_fprintf(defaultStream::error_stream(),
2837 "Unable to enable JVMCI in product mode\n");
2838 return JNI_ERR;
2839 }
2840 }
2841 // The flag was locked so process normally to report that error
2842 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2843 return JNI_EINVAL;
2844 }
2845 #endif // INCLUDE_JVMCI
2846 #if INCLUDE_JFR
2847 } else if (match_jfr_option(&option)) {
2848 return JNI_EINVAL;
2849 #endif
2850 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2851 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2852 // already been handled
2853 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2854 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2855 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2856 return JNI_EINVAL;
2857 }
2858 }
2859 // Unknown option
2860 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2861 return JNI_ERR;
2862 }
2863 }
2864
2865 // PrintSharedArchiveAndExit will turn on
2866 // -Xshare:on
2867 // -Xlog:class+path=info
2868 if (PrintSharedArchiveAndExit) {
2869 UseSharedSpaces = true;
2870 RequireSharedSpaces = true;
2871 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2872 }
2873
2874 fix_appclasspath();
2875
2876 return JNI_OK;
2877 }
2878
2879 void Arguments::set_ext_dirs(char *value) {
2880 _ext_dirs = os::strdup_check_oom(value);
2881 }
2882
2883 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2884 if (!allow_cds) {
2885 CDSConfig::set_module_patching_disables_cds();
2886 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2887 CDSConfig::set_java_base_module_patching_disables_cds();
2888 }
2889 }
2890
2891 // Create GrowableArray lazily, only if --patch-module has been specified
2892 if (_patch_mod_prefix == nullptr) {
2893 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2894 }
2895
2896 // Scan patches for matching module
2897 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2898 return (strcmp(module_name, patch->module_name()) == 0);
2899 });
2900 if (i == -1) {
2901 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2902 } else {
2903 if (allow_append) {
2904 // append path to existing module entry
2905 _patch_mod_prefix->at(i)->append_path(path);
2906 } else {
2907 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2908 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2909 } else {
2910 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2911 }
2912 }
2913 }
2914 }
2915
2916 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2917 //
2918 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2919 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2920 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2921 // path is treated as the current directory.
2922 //
2923 // This causes problems with CDS, which requires that all directories specified in the classpath
2924 // must be empty. In most cases, applications do NOT want to load classes from the current
2925 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2926 // scripts compatible with CDS.
2927 void Arguments::fix_appclasspath() {
2928 if (IgnoreEmptyClassPaths) {
2929 const char separator = *os::path_separator();
2930 const char* src = _java_class_path->value();
2931
2932 // skip over all the leading empty paths
2933 while (*src == separator) {
2934 src ++;
2935 }
2936
2937 char* copy = os::strdup_check_oom(src, mtArguments);
2938
2939 // trim all trailing empty paths
2940 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2941 *tail = '\0';
2942 }
2943
2944 char from[3] = {separator, separator, '\0'};
2945 char to [2] = {separator, '\0'};
2946 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2947 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2948 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2949 }
2950
2951 _java_class_path->set_writeable_value(copy);
2952 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2953 }
2954 }
2955
2956 jint Arguments::finalize_vm_init_args() {
2957 // check if the default lib/endorsed directory exists; if so, error
2958 char path[JVM_MAXPATHLEN];
2959 const char* fileSep = os::file_separator();
2960 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2961
2962 DIR* dir = os::opendir(path);
2963 if (dir != nullptr) {
2964 jio_fprintf(defaultStream::output_stream(),
2965 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2966 "in modular form will be supported via the concept of upgradeable modules.\n");
2967 os::closedir(dir);
2968 return JNI_ERR;
2969 }
2970
2971 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2972 dir = os::opendir(path);
2973 if (dir != nullptr) {
2974 jio_fprintf(defaultStream::output_stream(),
2975 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2976 "Use -classpath instead.\n.");
2977 os::closedir(dir);
2978 return JNI_ERR;
2979 }
2980
2981 // This must be done after all arguments have been processed
2982 // and the container support has been initialized since AggressiveHeap
2983 // relies on the amount of total memory available.
2984 if (AggressiveHeap) {
2985 jint result = set_aggressive_heap_flags();
2986 if (result != JNI_OK) {
2987 return result;
2988 }
2989 }
2990
2991 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2992 // but like -Xint, leave compilation thresholds unaffected.
2993 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2994 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2995 set_mode_flags(_int);
2996 }
2997
2998 #ifdef ZERO
2999 // Zero always runs in interpreted mode
3000 set_mode_flags(_int);
3001 #endif
3002
3003 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3004 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3005 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3006 }
3007
3008 #if !COMPILER2_OR_JVMCI
3009 // Don't degrade server performance for footprint
3010 if (FLAG_IS_DEFAULT(UseLargePages) &&
3011 MaxHeapSize < LargePageHeapSizeThreshold) {
3012 // No need for large granularity pages w/small heaps.
3013 // Note that large pages are enabled/disabled for both the
3014 // Java heap and the code cache.
3015 FLAG_SET_DEFAULT(UseLargePages, false);
3016 }
3017
3018 UNSUPPORTED_OPTION(ProfileInterpreter);
3019 #endif
3020
3021 // Parse the CompilationMode flag
3022 if (!CompilationModeFlag::initialize()) {
3023 return JNI_ERR;
3024 }
3025
3026 ClassLoader::set_preview_mode(is_valhalla_enabled());
3027
3028 // finalize --module-patch.
3029 if (finalize_patch_module() != JNI_OK) {
3030 return JNI_ERR;
3031 }
3032
3033 if (!check_vm_args_consistency()) {
3034 return JNI_ERR;
3035 }
3036
3037 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3038 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3039 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3040
3041 return JNI_OK;
3042 }
3043
3044 // Helper class for controlling the lifetime of JavaVMInitArgs
3045 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3046 // deleted on the destruction of the ScopedVMInitArgs object.
3047 class ScopedVMInitArgs : public StackObj {
3048 private:
3049 JavaVMInitArgs _args;
3050 char* _container_name;
3051 bool _is_set;
3052 char* _vm_options_file_arg;
3053
3054 public:
3055 ScopedVMInitArgs(const char *container_name) {
3056 _args.version = JNI_VERSION_1_2;
3057 _args.nOptions = 0;
3058 _args.options = nullptr;
3059 _args.ignoreUnrecognized = false;
3060 _container_name = (char *)container_name;
3061 _is_set = false;
3062 _vm_options_file_arg = nullptr;
3063 }
3064
3065 // Populates the JavaVMInitArgs object represented by this
3066 // ScopedVMInitArgs object with the arguments in options. The
3067 // allocated memory is deleted by the destructor. If this method
3068 // returns anything other than JNI_OK, then this object is in a
3069 // partially constructed state, and should be abandoned.
3070 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3071 _is_set = true;
3072 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3073 JavaVMOption, options->length(), mtArguments);
3074 if (options_arr == nullptr) {
3075 return JNI_ENOMEM;
3076 }
3077 _args.options = options_arr;
3078
3079 for (int i = 0; i < options->length(); i++) {
3080 options_arr[i] = options->at(i);
3081 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3082 if (options_arr[i].optionString == nullptr) {
3083 // Rely on the destructor to do cleanup.
3084 _args.nOptions = i;
3085 return JNI_ENOMEM;
3086 }
3087 }
3088
3089 _args.nOptions = options->length();
3090 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3091 return JNI_OK;
3092 }
3093
3094 JavaVMInitArgs* get() { return &_args; }
3095 char* container_name() { return _container_name; }
3096 bool is_set() { return _is_set; }
3097 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3098 char* vm_options_file_arg() { return _vm_options_file_arg; }
3099
3100 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3101 if (_vm_options_file_arg != nullptr) {
3102 os::free(_vm_options_file_arg);
3103 }
3104 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3105 }
3106
3107 ~ScopedVMInitArgs() {
3108 if (_vm_options_file_arg != nullptr) {
3109 os::free(_vm_options_file_arg);
3110 }
3111 if (_args.options == nullptr) return;
3112 for (int i = 0; i < _args.nOptions; i++) {
3113 os::free(_args.options[i].optionString);
3114 }
3115 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3116 }
3117
3118 // Insert options into this option list, to replace option at
3119 // vm_options_file_pos (-XX:VMOptionsFile)
3120 jint insert(const JavaVMInitArgs* args,
3121 const JavaVMInitArgs* args_to_insert,
3122 const int vm_options_file_pos) {
3123 assert(_args.options == nullptr, "shouldn't be set yet");
3124 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3125 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3126
3127 int length = args->nOptions + args_to_insert->nOptions - 1;
3128 // Construct new option array
3129 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3130 for (int i = 0; i < args->nOptions; i++) {
3131 if (i == vm_options_file_pos) {
3132 // insert the new options starting at the same place as the
3133 // -XX:VMOptionsFile option
3134 for (int j = 0; j < args_to_insert->nOptions; j++) {
3135 options.push(args_to_insert->options[j]);
3136 }
3137 } else {
3138 options.push(args->options[i]);
3139 }
3140 }
3141 // make into options array
3142 return set_args(&options);
3143 }
3144 };
3145
3146 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3147 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3148 }
3149
3150 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3151 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3152 }
3153
3154 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3155 for (int index = args->nOptions - 1; index >= 0; index--) {
3156 JavaVMOption* option = args->options + index;
3157 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3158 return option;
3159 }
3160 }
3161
3162 return nullptr;
3163 }
3164
3165 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3166 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3167 // Don't bother scanning all the args if this env variable is not set
3168 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3169 return JNI_OK;
3170 }
3171
3172 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3173 // of AOTMode.
3174 JavaVMOption* option = nullptr;
3175 for (int i = all_args->length() - 1; i >= 0; i--) {
3176 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3177 break;
3178 }
3179 }
3180
3181 if (option != nullptr) {
3182 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3183 // so its value is not reflected inside the global variable AOTMode.
3184 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3185 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3186 }
3187 } else {
3188 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3189 // which would have been set inside process_settings_file();
3190 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3191 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3192 }
3193 }
3194
3195 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3196 }
3197
3198 jint Arguments::parse_options_environment_variable(const char* name,
3199 ScopedVMInitArgs* vm_args) {
3200 char *buffer = ::getenv(name);
3201
3202 // Don't check this environment variable if user has special privileges
3203 // (e.g. unix su command).
3204 if (buffer == nullptr || os::have_special_privileges()) {
3205 return JNI_OK;
3206 }
3207
3208 if ((buffer = os::strdup(buffer)) == nullptr) {
3209 return JNI_ENOMEM;
3210 }
3211
3212 jio_fprintf(defaultStream::error_stream(),
3213 "Picked up %s: %s\n", name, buffer);
3214
3215 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3216
3217 os::free(buffer);
3218 return retcode;
3219 }
3220
3221 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3222 // read file into buffer
3223 int fd = ::open(file_name, O_RDONLY);
3224 if (fd < 0) {
3225 jio_fprintf(defaultStream::error_stream(),
3226 "Could not open options file '%s'\n",
3227 file_name);
3228 return JNI_ERR;
3229 }
3230
3231 struct stat stbuf;
3232 int retcode = os::stat(file_name, &stbuf);
3233 if (retcode != 0) {
3234 jio_fprintf(defaultStream::error_stream(),
3235 "Could not stat options file '%s'\n",
3236 file_name);
3237 ::close(fd);
3238 return JNI_ERR;
3239 }
3240
3241 if (stbuf.st_size == 0) {
3242 // tell caller there is no option data and that is ok
3243 ::close(fd);
3244 return JNI_OK;
3245 }
3246
3247 // '+ 1' for null termination even with max bytes
3248 size_t bytes_alloc = stbuf.st_size + 1;
3249
3250 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3251 if (nullptr == buf) {
3252 jio_fprintf(defaultStream::error_stream(),
3253 "Could not allocate read buffer for options file parse\n");
3254 ::close(fd);
3255 return JNI_ENOMEM;
3256 }
3257
3258 memset(buf, 0, bytes_alloc);
3259
3260 // Fill buffer
3261 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3262 ::close(fd);
3263 if (bytes_read < 0) {
3264 FREE_C_HEAP_ARRAY(char, buf);
3265 jio_fprintf(defaultStream::error_stream(),
3266 "Could not read options file '%s'\n", file_name);
3267 return JNI_ERR;
3268 }
3269
3270 if (bytes_read == 0) {
3271 // tell caller there is no option data and that is ok
3272 FREE_C_HEAP_ARRAY(char, buf);
3273 return JNI_OK;
3274 }
3275
3276 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3277
3278 FREE_C_HEAP_ARRAY(char, buf);
3279 return retcode;
3280 }
3281
3282 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3283 // Construct option array
3284 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3285
3286 // some pointers to help with parsing
3287 char *buffer_end = buffer + buf_len;
3288 char *opt_hd = buffer;
3289 char *wrt = buffer;
3290 char *rd = buffer;
3291
3292 // parse all options
3293 while (rd < buffer_end) {
3294 // skip leading white space from the input string
3295 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3296 rd++;
3297 }
3298
3299 if (rd >= buffer_end) {
3300 break;
3301 }
3302
3303 // Remember this is where we found the head of the token.
3304 opt_hd = wrt;
3305
3306 // Tokens are strings of non white space characters separated
3307 // by one or more white spaces.
3308 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3309 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3310 int quote = *rd; // matching quote to look for
3311 rd++; // don't copy open quote
3312 while (rd < buffer_end && *rd != quote) {
3313 // include everything (even spaces)
3314 // up until the close quote
3315 *wrt++ = *rd++; // copy to option string
3316 }
3317
3318 if (rd < buffer_end) {
3319 rd++; // don't copy close quote
3320 } else {
3321 // did not see closing quote
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Unmatched quote in %s\n", name);
3324 return JNI_ERR;
3325 }
3326 } else {
3327 *wrt++ = *rd++; // copy to option string
3328 }
3329 }
3330
3331 // steal a white space character and set it to null
3332 *wrt++ = '\0';
3333 // We now have a complete token
3334
3335 JavaVMOption option;
3336 option.optionString = opt_hd;
3337 option.extraInfo = nullptr;
3338
3339 options.append(option); // Fill in option
3340
3341 rd++; // Advance to next character
3342 }
3343
3344 // Fill out JavaVMInitArgs structure.
3345 return vm_args->set_args(&options);
3346 }
3347
3348 #ifndef PRODUCT
3349 // Determine whether LogVMOutput should be implicitly turned on.
3350 static bool use_vm_log() {
3351 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3352 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3353 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3354 PrintAssembly || TraceDeoptimization ||
3355 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3356 return true;
3357 }
3358
3359 #ifdef COMPILER1
3360 if (PrintC1Statistics) {
3361 return true;
3362 }
3363 #endif // COMPILER1
3364
3365 #ifdef COMPILER2
3366 if (PrintOptoAssembly || PrintOptoStatistics) {
3367 return true;
3368 }
3369 #endif // COMPILER2
3370
3371 return false;
3372 }
3373
3374 #endif // PRODUCT
3375
3376 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3377 for (int index = 0; index < args->nOptions; index++) {
3378 const JavaVMOption* option = args->options + index;
3379 const char* tail;
3380 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3381 return true;
3382 }
3383 }
3384 return false;
3385 }
3386
3387 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3388 const char* vm_options_file,
3389 const int vm_options_file_pos,
3390 ScopedVMInitArgs* vm_options_file_args,
3391 ScopedVMInitArgs* args_out) {
3392 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3393 if (code != JNI_OK) {
3394 return code;
3395 }
3396
3397 if (vm_options_file_args->get()->nOptions < 1) {
3398 return JNI_OK;
3399 }
3400
3401 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3402 jio_fprintf(defaultStream::error_stream(),
3403 "A VM options file may not refer to a VM options file. "
3404 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3405 "options file '%s' in options container '%s' is an error.\n",
3406 vm_options_file_args->vm_options_file_arg(),
3407 vm_options_file_args->container_name());
3408 return JNI_EINVAL;
3409 }
3410
3411 return args_out->insert(args, vm_options_file_args->get(),
3412 vm_options_file_pos);
3413 }
3414
3415 // Expand -XX:VMOptionsFile found in args_in as needed.
3416 // mod_args and args_out parameters may return values as needed.
3417 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3418 ScopedVMInitArgs* mod_args,
3419 JavaVMInitArgs** args_out) {
3420 jint code = match_special_option_and_act(args_in, mod_args);
3421 if (code != JNI_OK) {
3422 return code;
3423 }
3424
3425 if (mod_args->is_set()) {
3426 // args_in contains -XX:VMOptionsFile and mod_args contains the
3427 // original options from args_in along with the options expanded
3428 // from the VMOptionsFile. Return a short-hand to the caller.
3429 *args_out = mod_args->get();
3430 } else {
3431 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3432 }
3433 return JNI_OK;
3434 }
3435
3436 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3437 ScopedVMInitArgs* args_out) {
3438 // Remaining part of option string
3439 const char* tail;
3440 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3441
3442 for (int index = 0; index < args->nOptions; index++) {
3443 const JavaVMOption* option = args->options + index;
3444 if (match_option(option, "-XX:Flags=", &tail)) {
3445 Arguments::set_jvm_flags_file(tail);
3446 continue;
3447 }
3448 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3449 if (vm_options_file_args.found_vm_options_file_arg()) {
3450 jio_fprintf(defaultStream::error_stream(),
3451 "The option '%s' is already specified in the options "
3452 "container '%s' so the specification of '%s' in the "
3453 "same options container is an error.\n",
3454 vm_options_file_args.vm_options_file_arg(),
3455 vm_options_file_args.container_name(),
3456 option->optionString);
3457 return JNI_EINVAL;
3458 }
3459 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3460 // If there's a VMOptionsFile, parse that
3461 jint code = insert_vm_options_file(args, tail, index,
3462 &vm_options_file_args, args_out);
3463 if (code != JNI_OK) {
3464 return code;
3465 }
3466 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3467 if (args_out->is_set()) {
3468 // The VMOptions file inserted some options so switch 'args'
3469 // to the new set of options, and continue processing which
3470 // preserves "last option wins" semantics.
3471 args = args_out->get();
3472 // The first option from the VMOptionsFile replaces the
3473 // current option. So we back track to process the
3474 // replacement option.
3475 index--;
3476 }
3477 continue;
3478 }
3479 if (match_option(option, "-XX:+PrintVMOptions")) {
3480 PrintVMOptions = true;
3481 continue;
3482 }
3483 if (match_option(option, "-XX:-PrintVMOptions")) {
3484 PrintVMOptions = false;
3485 continue;
3486 }
3487 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3488 IgnoreUnrecognizedVMOptions = true;
3489 continue;
3490 }
3491 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3492 IgnoreUnrecognizedVMOptions = false;
3493 continue;
3494 }
3495 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3496 JVMFlag::printFlags(tty, false);
3497 vm_exit(0);
3498 }
3499
3500 #ifndef PRODUCT
3501 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3502 JVMFlag::printFlags(tty, true);
3503 vm_exit(0);
3504 }
3505 #endif
3506 }
3507 return JNI_OK;
3508 }
3509
3510 static void print_options(const JavaVMInitArgs *args) {
3511 const char* tail;
3512 for (int index = 0; index < args->nOptions; index++) {
3513 const JavaVMOption *option = args->options + index;
3514 if (match_option(option, "-XX:", &tail)) {
3515 logOption(tail);
3516 }
3517 }
3518 }
3519
3520 bool Arguments::handle_deprecated_print_gc_flags() {
3521 if (PrintGC) {
3522 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3523 }
3524 if (PrintGCDetails) {
3525 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3526 }
3527
3528 if (_legacyGCLogging.lastFlag == 2) {
3529 // -Xloggc was used to specify a filename
3530 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3531
3532 LogTarget(Error, logging) target;
3533 LogStream errstream(target);
3534 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3535 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3536 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3537 }
3538 return true;
3539 }
3540
3541 static void apply_debugger_ergo() {
3542 #ifdef ASSERT
3543 if (ReplayCompiles) {
3544 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3545 }
3546
3547 if (UseDebuggerErgo) {
3548 // Turn on sub-flags
3549 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3550 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3551 }
3552
3553 if (UseDebuggerErgo2) {
3554 // Debugging with limited number of CPUs
3555 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3556 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3557 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3558 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3559 }
3560 #endif // ASSERT
3561 }
3562
3563 // Parse entry point called from JNI_CreateJavaVM
3564
3565 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3566 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3567 JVMFlag::check_all_flag_declarations();
3568
3569 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3570 const char* hotspotrc = ".hotspotrc";
3571 bool settings_file_specified = false;
3572 bool needs_hotspotrc_warning = false;
3573 ScopedVMInitArgs initial_vm_options_args("");
3574 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3575 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3576 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3577
3578 // Pointers to current working set of containers
3579 JavaVMInitArgs* cur_cmd_args;
3580 JavaVMInitArgs* cur_vm_options_args;
3581 JavaVMInitArgs* cur_java_options_args;
3582 JavaVMInitArgs* cur_java_tool_options_args;
3583 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3584
3585 // Containers for modified/expanded options
3586 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3587 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3588 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3589 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3590 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3591
3592 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3593
3594 jint code =
3595 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3596 if (code != JNI_OK) {
3597 return code;
3598 }
3599
3600 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3601 // This is an undocumented feature.
3602 code = parse_java_options_environment_variable(&initial_java_options_args);
3603 if (code != JNI_OK) {
3604 return code;
3605 }
3606
3607 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3608 char *vmoptions = ClassLoader::lookup_vm_options();
3609 if (vmoptions != nullptr) {
3610 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3611 FREE_C_HEAP_ARRAY(char, vmoptions);
3612 if (code != JNI_OK) {
3613 return code;
3614 }
3615 }
3616
3617 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3618 &mod_java_tool_options_args,
3619 &cur_java_tool_options_args);
3620 if (code != JNI_OK) {
3621 return code;
3622 }
3623
3624 code = expand_vm_options_as_needed(initial_cmd_args,
3625 &mod_cmd_args,
3626 &cur_cmd_args);
3627 if (code != JNI_OK) {
3628 return code;
3629 }
3630
3631 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3632 &mod_java_options_args,
3633 &cur_java_options_args);
3634 if (code != JNI_OK) {
3635 return code;
3636 }
3637
3638 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3639 &mod_vm_options_args,
3640 &cur_vm_options_args);
3641 if (code != JNI_OK) {
3642 return code;
3643 }
3644
3645 const char* flags_file = Arguments::get_jvm_flags_file();
3646 settings_file_specified = (flags_file != nullptr);
3647
3648 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3649 if (settings_file_specified) {
3650 if (!process_settings_file(flags_file, true,
3651 IgnoreUnrecognizedVMOptions)) {
3652 return JNI_EINVAL;
3653 }
3654 } else {
3655 #ifdef ASSERT
3656 // Parse default .hotspotrc settings file
3657 if (!process_settings_file(".hotspotrc", false,
3658 IgnoreUnrecognizedVMOptions)) {
3659 return JNI_EINVAL;
3660 }
3661 #else
3662 struct stat buf;
3663 if (os::stat(hotspotrc, &buf) == 0) {
3664 needs_hotspotrc_warning = true;
3665 }
3666 #endif
3667 }
3668
3669 // The settings in the args are applied in this order to the the JVM global flags.
3670 // For historical reasons, the order is DIFFERENT than the scanning order of
3671 // the above expand_vm_options_as_needed() calls.
3672 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3673 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3674 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3675 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3676
3677 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3678 // the options that have been gathered above.
3679 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3680 if (code != JNI_OK) {
3681 return code;
3682 }
3683 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3684 &mod_jdk_aot_vm_options_args,
3685 &cur_jdk_aot_vm_options_args);
3686 if (code != JNI_OK) {
3687 return code;
3688 }
3689
3690 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3691 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3692 const char* optionString = option->optionString;
3693 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3694 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3695 jio_fprintf(defaultStream::error_stream(),
3696 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3697 return JNI_ERR;
3698 }
3699 }
3700
3701 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3702
3703 if (IgnoreUnrecognizedVMOptions) {
3704 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3705 // the JDK so it shouldn't have bad options.
3706 cur_cmd_args->ignoreUnrecognized = true;
3707 cur_java_tool_options_args->ignoreUnrecognized = true;
3708 cur_java_options_args->ignoreUnrecognized = true;
3709 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3710 }
3711
3712 if (PrintVMOptions) {
3713 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3714 print_options(cur_java_tool_options_args);
3715 print_options(cur_cmd_args);
3716 print_options(cur_java_options_args);
3717 print_options(cur_jdk_aot_vm_options_args);
3718 }
3719
3720 // Apply the settings in these args to the JVM global flags.
3721 jint result = parse_vm_init_args(&all_args);
3722
3723 if (result != JNI_OK) {
3724 return result;
3725 }
3726
3727 // Delay warning until here so that we've had a chance to process
3728 // the -XX:-PrintWarnings flag
3729 if (needs_hotspotrc_warning) {
3730 warning("%s file is present but has been ignored. "
3731 "Run with -XX:Flags=%s to load the file.",
3732 hotspotrc, hotspotrc);
3733 }
3734
3735 if (needs_module_property_warning) {
3736 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3737 " names that are reserved for internal use.");
3738 }
3739
3740 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3741 UNSUPPORTED_OPTION(UseLargePages);
3742 #endif
3743
3744 #if defined(AIX)
3745 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3746 #endif
3747
3748 #ifndef PRODUCT
3749 if (TraceBytecodesAt != 0) {
3750 TraceBytecodes = true;
3751 }
3752 #endif // PRODUCT
3753
3754 if (ScavengeRootsInCode == 0) {
3755 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3756 warning("Forcing ScavengeRootsInCode non-zero");
3757 }
3758 ScavengeRootsInCode = 1;
3759 }
3760
3761 if (!handle_deprecated_print_gc_flags()) {
3762 return JNI_EINVAL;
3763 }
3764
3765 // Set object alignment values.
3766 set_object_alignment();
3767
3768 #if !INCLUDE_CDS
3769 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3770 jio_fprintf(defaultStream::error_stream(),
3771 "Shared spaces are not supported in this VM\n");
3772 return JNI_ERR;
3773 }
3774 if (DumpLoadedClassList != nullptr) {
3775 jio_fprintf(defaultStream::error_stream(),
3776 "DumpLoadedClassList is not supported in this VM\n");
3777 return JNI_ERR;
3778 }
3779 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3780 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3781 warning("Shared spaces are not supported in this VM");
3782 UseSharedSpaces = false;
3783 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3784 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3785 }
3786 no_shared_spaces("CDS Disabled");
3787 #endif // INCLUDE_CDS
3788
3789 // Verify NMT arguments
3790 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3791 if (lvl == NMT_unknown) {
3792 jio_fprintf(defaultStream::error_stream(),
3793 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3794 return JNI_ERR;
3795 }
3796 if (PrintNMTStatistics && lvl == NMT_off) {
3797 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3798 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3799 }
3800
3801 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3802 if (trace_dependencies && VerifyDependencies) {
3803 warning("dependency logging results may be inflated by VerifyDependencies");
3804 }
3805
3806 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3807 log_is_enabled(Info, class, load, cause);
3808 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3809 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3810 }
3811
3812 apply_debugger_ergo();
3813
3814 // The VMThread needs to stop now and then to execute these debug options.
3815 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3816 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3817 }
3818
3819 if (log_is_enabled(Info, arguments)) {
3820 LogStream st(Log(arguments)::info());
3821 Arguments::print_on(&st);
3822 }
3823
3824 return JNI_OK;
3825 }
3826
3827 void Arguments::set_compact_headers_flags() {
3828 #ifdef _LP64
3829 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3830 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3831 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3832 }
3833 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3834 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3835 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3836 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3837
3838 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3839 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3840 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3841 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3842 } else {
3843 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3844 }
3845 }
3846 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3847 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3848 }
3849 #endif
3850 }
3851
3852 jint Arguments::apply_ergo() {
3853 // Set flags based on ergonomics.
3854 jint result = set_ergonomics_flags();
3855 if (result != JNI_OK) return result;
3856
3857 // Set heap size based on available physical memory
3858 set_heap_size();
3859
3860 GCConfig::arguments()->initialize();
3861
3862 set_compact_headers_flags();
3863
3864 if (UseCompressedClassPointers) {
3865 CompressedKlassPointers::pre_initialize();
3866 }
3867
3868 CDSConfig::ergo_initialize();
3869
3870 // Initialize Metaspace flags and alignments
3871 Metaspace::ergo_initialize();
3872
3873 if (!StringDedup::ergo_initialize()) {
3874 return JNI_EINVAL;
3875 }
3876
3877 // Set compiler flags after GC is selected and GC specific
3878 // flags (LoopStripMiningIter) are set.
3879 CompilerConfig::ergo_initialize();
3880
3881 // Set bytecode rewriting flags
3882 set_bytecode_flags();
3883
3884 // Set flags if aggressive optimization flags are enabled
3885 jint code = set_aggressive_opts_flags();
3886 if (code != JNI_OK) {
3887 return code;
3888 }
3889
3890 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3891 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3892 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3893 warning("UseSecondarySupersTable is not supported");
3894 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3895 }
3896 if (!UseSecondarySupersTable) {
3897 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3898 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3899 }
3900
3901 #ifdef ZERO
3902 // Clear flags not supported on zero.
3903 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3904 #endif // ZERO
3905
3906 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3907 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3908 DebugNonSafepoints = true;
3909 }
3910
3911 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3912 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3913 }
3914
3915 // Treat the odd case where local verification is enabled but remote
3916 // verification is not as if both were enabled.
3917 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3918 log_info(verification)("Turning on remote verification because local verification is on");
3919 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3920 }
3921 if (!is_valhalla_enabled()) {
3922 #define WARN_IF_NOT_DEFAULT_FLAG(flag) \
3923 if (!FLAG_IS_DEFAULT(flag)) { \
3924 warning("Valhalla-specific flag \"%s\" has no effect when --enable-preview is not specified.", #flag); \
3925 }
3926
3927 #define DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(flag) \
3928 WARN_IF_NOT_DEFAULT_FLAG(flag) \
3929 FLAG_SET_DEFAULT(flag, false);
3930
3931 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypePassFieldsAsArgs);
3932 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypeReturnedAsFields);
3933 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayFlattening);
3934 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseFieldFlattening);
3935 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNonAtomicValueFlattening);
3936 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullableValueFlattening);
3937 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseAtomicValueFlattening);
3938 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintInlineLayout);
3939 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintFlatArrayLayout);
3940 WARN_IF_NOT_DEFAULT_FLAG(FlatArrayElementMaxOops);
3941 WARN_IF_NOT_DEFAULT_FLAG(UseAltSubstitutabilityMethod);
3942 #ifdef ASSERT
3943 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(StressCallingConvention);
3944 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PreloadClasses);
3945 WARN_IF_NOT_DEFAULT_FLAG(PrintInlineKlassFields);
3946 #endif
3947 #ifdef COMPILER1
3948 DEBUG_ONLY(DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(C1UseDelayedFlattenedFieldReads);)
3949 #endif
3950 #ifdef COMPILER2
3951 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayLoadStoreProfile);
3952 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseACmpProfile);
3953 #endif
3954 #undef DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT
3955 #undef WARN_IF_NOT_DEFAULT_FLAG
3956 } else {
3957 if (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces) {
3958 // Disable calling convention optimizations if inline types are not supported.
3959 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3960 // the CDS archive, as the values must match between dumptime and runtime.
3961 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3962 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3963 }
3964 if (!UseNonAtomicValueFlattening && !UseNullableValueFlattening && !UseAtomicValueFlattening) {
3965 // Flattening is disabled
3966 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3967 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3968 }
3969 }
3970
3971 #ifndef PRODUCT
3972 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3973 if (use_vm_log()) {
3974 LogVMOutput = true;
3975 }
3976 }
3977 #endif // PRODUCT
3978
3979 if (PrintCommandLineFlags) {
3980 JVMFlag::printSetFlags(tty);
3981 }
3982
3983 #if COMPILER2_OR_JVMCI
3984 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3985 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3986 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3987 }
3988 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3989
3990 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3991 if (!EnableVectorReboxing) {
3992 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3993 } else {
3994 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3995 }
3996 }
3997 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3998 }
3999 #endif // COMPILER2_OR_JVMCI
4000
4001 #ifdef COMPILER2
4002 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
4003 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
4004 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
4005 }
4006 #endif // COMPILER2
4007
4008 if (log_is_enabled(Info, perf, class, link)) {
4009 if (!UsePerfData) {
4010 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
4011 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
4012 assert(!log_is_enabled(Info, perf, class, link), "sanity");
4013 }
4014 }
4015
4016 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4017 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4018 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4019 }
4020 }
4021 return JNI_OK;
4022 }
4023
4024 jint Arguments::adjust_after_os() {
4025 if (UseNUMA) {
4026 if (UseParallelGC) {
4027 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4028 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4029 }
4030 }
4031 }
4032 return JNI_OK;
4033 }
4034
4035 int Arguments::PropertyList_count(SystemProperty* pl) {
4036 int count = 0;
4037 while(pl != nullptr) {
4038 count++;
4039 pl = pl->next();
4040 }
4041 return count;
4042 }
4043
4044 // Return the number of readable properties.
4045 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4046 int count = 0;
4047 while(pl != nullptr) {
4048 if (pl->readable()) {
4049 count++;
4050 }
4051 pl = pl->next();
4052 }
4053 return count;
4054 }
4055
4056 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4057 assert(key != nullptr, "just checking");
4058 SystemProperty* prop;
4059 for (prop = pl; prop != nullptr; prop = prop->next()) {
4060 if (strcmp(key, prop->key()) == 0) return prop->value();
4061 }
4062 return nullptr;
4063 }
4064
4065 // Return the value of the requested property provided that it is a readable property.
4066 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4067 assert(key != nullptr, "just checking");
4068 SystemProperty* prop;
4069 // Return the property value if the keys match and the property is not internal or
4070 // it's the special internal property "jdk.boot.class.path.append".
4071 for (prop = pl; prop != nullptr; prop = prop->next()) {
4072 if (strcmp(key, prop->key()) == 0) {
4073 if (!prop->internal()) {
4074 return prop->value();
4075 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4076 return prop->value();
4077 } else {
4078 // Property is internal and not jdk.boot.class.path.append so return null.
4079 return nullptr;
4080 }
4081 }
4082 }
4083 return nullptr;
4084 }
4085
4086 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4087 SystemProperty* p = *plist;
4088 if (p == nullptr) {
4089 *plist = new_p;
4090 } else {
4091 while (p->next() != nullptr) {
4092 p = p->next();
4093 }
4094 p->set_next(new_p);
4095 }
4096 }
4097
4098 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4099 bool writeable, bool internal) {
4100 if (plist == nullptr)
4101 return;
4102
4103 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4104 PropertyList_add(plist, new_p);
4105 }
4106
4107 void Arguments::PropertyList_add(SystemProperty *element) {
4108 PropertyList_add(&_system_properties, element);
4109 }
4110
4111 // This add maintains unique property key in the list.
4112 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4113 PropertyAppendable append, PropertyWriteable writeable,
4114 PropertyInternal internal) {
4115 if (plist == nullptr)
4116 return;
4117
4118 // If property key exists and is writeable, then update with new value.
4119 // Trying to update a non-writeable property is silently ignored.
4120 SystemProperty* prop;
4121 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4122 if (strcmp(k, prop->key()) == 0) {
4123 if (append == AppendProperty) {
4124 prop->append_writeable_value(v);
4125 } else {
4126 prop->set_writeable_value(v);
4127 }
4128 return;
4129 }
4130 }
4131
4132 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4133 }
4134
4135 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4136 // Returns true if all of the source pointed by src has been copied over to
4137 // the destination buffer pointed by buf. Otherwise, returns false.
4138 // Notes:
4139 // 1. If the length (buflen) of the destination buffer excluding the
4140 // null terminator character is not long enough for holding the expanded
4141 // pid characters, it also returns false instead of returning the partially
4142 // expanded one.
4143 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4144 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4145 char* buf, size_t buflen) {
4146 const char* p = src;
4147 char* b = buf;
4148 const char* src_end = &src[srclen];
4149 char* buf_end = &buf[buflen - 1];
4150
4151 while (p < src_end && b < buf_end) {
4152 if (*p == '%') {
4153 switch (*(++p)) {
4154 case '%': // "%%" ==> "%"
4155 *b++ = *p++;
4156 break;
4157 case 'p': { // "%p" ==> current process id
4158 // buf_end points to the character before the last character so
4159 // that we could write '\0' to the end of the buffer.
4160 size_t buf_sz = buf_end - b + 1;
4161 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4162
4163 // if jio_snprintf fails or the buffer is not long enough to hold
4164 // the expanded pid, returns false.
4165 if (ret < 0 || ret >= (int)buf_sz) {
4166 return false;
4167 } else {
4168 b += ret;
4169 assert(*b == '\0', "fail in copy_expand_pid");
4170 if (p == src_end && b == buf_end + 1) {
4171 // reach the end of the buffer.
4172 return true;
4173 }
4174 }
4175 p++;
4176 break;
4177 }
4178 default :
4179 *b++ = '%';
4180 }
4181 } else {
4182 *b++ = *p++;
4183 }
4184 }
4185 *b = '\0';
4186 return (p == src_end); // return false if not all of the source was copied
4187 }