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/cds_globals.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "compiler/compilerDefinitions.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "gc/shared/genArguments.hpp"
36 #include "gc/shared/stringdedup/stringDedup.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "jvm.h"
39 #include "logging/log.hpp"
40 #include "logging/logConfiguration.hpp"
41 #include "logging/logStream.hpp"
42 #include "logging/logTag.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "nmt/nmtCommon.hpp"
45 #include "oops/compressedKlass.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/objLayout.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiAgentList.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/flags/jvmFlag.hpp"
53 #include "runtime/flags/jvmFlagAccess.hpp"
54 #include "runtime/flags/jvmFlagLimit.hpp"
55 #include "runtime/globals_extension.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepoint.hpp"
59 #include "runtime/safepointMechanism.hpp"
60 #include "runtime/synchronizer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "services/management.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/checkedCast.hpp"
65 #include "utilities/debug.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/macros.hpp"
68 #include "utilities/parseInteger.hpp"
69 #include "utilities/powerOfTwo.hpp"
70 #include "utilities/stringUtils.hpp"
71 #include "utilities/systemMemoryBarrier.hpp"
72 #if INCLUDE_JFR
73 #include "jfr/jfr.hpp"
74 #endif
75
76 #include <limits>
77 #include <string.h>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 unsigned int Arguments::_addmods_count = 0;
89 char* Arguments::_java_command = nullptr;
90 SystemProperty* Arguments::_system_properties = nullptr;
91 size_t Arguments::_conservative_max_heap_alignment = 0;
92 Arguments::Mode Arguments::_mode = _mixed;
93 const char* Arguments::_java_vendor_url_bug = nullptr;
94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
95 bool Arguments::_executing_unit_tests = false;
96
97 // These parameters are reset in method parse_vm_init_args()
98 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
99 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
100 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
101 bool Arguments::_ClipInlining = ClipInlining;
102 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
103
104 bool Arguments::_enable_preview = false;
105 bool Arguments::_has_jdwp_agent = false;
106
107 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
108
109 // These are not set by the JDK's built-in launchers, but they can be set by
110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
111 // JavaVMOption in jni.h.
112 abort_hook_t Arguments::_abort_hook = nullptr;
113 exit_hook_t Arguments::_exit_hook = nullptr;
114 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
115
116
117 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
118 SystemProperty *Arguments::_java_library_path = nullptr;
119 SystemProperty *Arguments::_java_home = nullptr;
120 SystemProperty *Arguments::_java_class_path = nullptr;
121 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
122 SystemProperty *Arguments::_vm_info = nullptr;
123
124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
125 PathString *Arguments::_boot_class_path = nullptr;
126 bool Arguments::_has_jimage = false;
127
128 char* Arguments::_ext_dirs = nullptr;
129
130 // True if -Xshare:auto option was specified.
131 static bool xshare_auto_cmd_line = false;
132
133 // True if -Xint/-Xmixed/-Xcomp were specified
134 static bool mode_flag_cmd_line = false;
135
136 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
137 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
138 if (new_value == nullptr) {
139 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
140 return false;
141 }
142 if (_value != nullptr) {
143 FreeHeap(_value);
144 }
145 _value = new_value;
146 strcpy(_value, value);
147 return true;
148 }
149
150 void PathString::append_value(const char *value) {
151 char *sp;
152 size_t len = 0;
153 if (value != nullptr) {
154 len = strlen(value);
155 if (_value != nullptr) {
156 len += strlen(_value);
157 }
158 sp = AllocateHeap(len+2, mtArguments);
159 assert(sp != nullptr, "Unable to allocate space for new append path value");
160 if (sp != nullptr) {
161 if (_value != nullptr) {
162 strcpy(sp, _value);
163 strcat(sp, os::path_separator());
164 strcat(sp, value);
165 FreeHeap(_value);
166 } else {
167 strcpy(sp, value);
168 }
169 _value = sp;
170 }
171 }
172 }
173
174 PathString::PathString(const char* value) {
175 if (value == nullptr) {
176 _value = nullptr;
177 } else {
178 _value = AllocateHeap(strlen(value)+1, mtArguments);
179 strcpy(_value, value);
180 }
181 }
182
183 PathString::~PathString() {
184 if (_value != nullptr) {
185 FreeHeap(_value);
186 _value = nullptr;
187 }
188 }
189
190 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
191 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
192 size_t len = strlen(module_name) + 1;
193 _module_name = AllocateHeap(len, mtInternal);
194 strncpy(_module_name, module_name, len); // copy the trailing null
195 _path = new PathString(path);
196 }
197
198 ModulePatchPath::~ModulePatchPath() {
199 if (_module_name != nullptr) {
200 FreeHeap(_module_name);
201 _module_name = nullptr;
202 }
203 if (_path != nullptr) {
204 delete _path;
205 _path = nullptr;
206 }
207 }
208
209 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
210 if (key == nullptr) {
211 _key = nullptr;
212 } else {
213 _key = AllocateHeap(strlen(key)+1, mtArguments);
214 strcpy(_key, key);
215 }
216 _next = nullptr;
217 _internal = internal;
218 _writeable = writeable;
219 }
220
221 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
222 // part of the option string.
223 static bool match_option(const JavaVMOption *option, const char* name,
224 const char** tail) {
225 size_t len = strlen(name);
226 if (strncmp(option->optionString, name, len) == 0) {
227 *tail = option->optionString + len;
228 return true;
229 } else {
230 return false;
231 }
232 }
233
234 // Check if 'option' matches 'name'. No "tail" is allowed.
235 static bool match_option(const JavaVMOption *option, const char* name) {
236 const char* tail = nullptr;
237 bool result = match_option(option, name, &tail);
238 if (tail != nullptr && *tail == '\0') {
239 return result;
240 } else {
241 return false;
242 }
243 }
244
245 // Return true if any of the strings in null-terminated array 'names' matches.
246 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
247 // the option must match exactly.
248 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
249 bool tail_allowed) {
250 for (/* empty */; *names != nullptr; ++names) {
251 if (match_option(option, *names, tail)) {
252 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
253 return true;
254 }
255 }
256 }
257 return false;
258 }
259
260 #if INCLUDE_JFR
261 static bool _has_jfr_option = false; // is using JFR
262
263 // return true on failure
264 static bool match_jfr_option(const JavaVMOption** option) {
265 assert((*option)->optionString != nullptr, "invariant");
266 char* tail = nullptr;
267 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
268 _has_jfr_option = true;
269 return Jfr::on_start_flight_recording_option(option, tail);
270 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_flight_recorder_option(option, tail);
273 }
274 return false;
275 }
276
277 bool Arguments::has_jfr_option() {
278 return _has_jfr_option;
279 }
280 #endif
281
282 static void logOption(const char* opt) {
283 if (PrintVMOptions) {
284 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
285 }
286 }
287
288 bool needs_module_property_warning = false;
289
290 #define MODULE_PROPERTY_PREFIX "jdk.module."
291 #define MODULE_PROPERTY_PREFIX_LEN 11
292 #define ADDEXPORTS "addexports"
293 #define ADDEXPORTS_LEN 10
294 #define ADDREADS "addreads"
295 #define ADDREADS_LEN 8
296 #define ADDOPENS "addopens"
297 #define ADDOPENS_LEN 8
298 #define PATCH "patch"
299 #define PATCH_LEN 5
300 #define ADDMODS "addmods"
301 #define ADDMODS_LEN 7
302 #define LIMITMODS "limitmods"
303 #define LIMITMODS_LEN 9
304 #define PATH "path"
305 #define PATH_LEN 4
306 #define UPGRADE_PATH "upgrade.path"
307 #define UPGRADE_PATH_LEN 12
308 #define ENABLE_NATIVE_ACCESS "enable.native.access"
309 #define ENABLE_NATIVE_ACCESS_LEN 20
310 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
311 #define ILLEGAL_NATIVE_ACCESS_LEN 21
312
313 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
314 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
315 return ((strncmp(option, property, len) == 0) &&
316 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
317 }
318
319 // Return true if property starts with "jdk.module." and its ensuing chars match
320 // any of the reserved module properties.
321 // property should be passed without the leading "-D".
322 bool Arguments::is_internal_module_property(const char* property) {
323 return internal_module_property_helper(property, false);
324 }
325
326 // Returns true if property is one of those recognized by is_internal_module_property() but
327 // is not supported by CDS archived full module graph.
328 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
329 return internal_module_property_helper(property, true);
330 }
331
332 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
333 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
334 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
335 if (matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
336 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
337 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
338 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
339 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
340 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
341 return true;
342 }
343
344 if (!check_for_cds) {
345 // CDS notes: these properties are supported by CDS archived full module graph.
346 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
347 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
348 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
349 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
350 return true;
351 }
352 }
353 }
354 return false;
355 }
356
357 // Process java launcher properties.
358 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
359 // See if sun.java.launcher is defined.
360 // Must do this before setting up other system properties,
361 // as some of them may depend on launcher type.
362 for (int index = 0; index < args->nOptions; index++) {
363 const JavaVMOption* option = args->options + index;
364 const char* tail;
365
366 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
367 process_java_launcher_argument(tail, option->extraInfo);
368 continue;
369 }
370 if (match_option(option, "-XX:+ExecutingUnitTests")) {
371 _executing_unit_tests = true;
372 continue;
373 }
374 }
375 }
376
377 // Initialize system properties key and value.
378 void Arguments::init_system_properties() {
379
380 // Set up _boot_class_path which is not a property but
381 // relies heavily on argument processing and the jdk.boot.class.path.append
382 // property. It is used to store the underlying boot class path.
383 _boot_class_path = new PathString(nullptr);
384
385 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
386 "Java Virtual Machine Specification", false));
387 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
390
391 // Initialize the vm.info now, but it will need updating after argument parsing.
392 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
393
394 // Following are JVMTI agent writable properties.
395 // Properties values are set to nullptr and they are
396 // os specific they are initialized in os::init_system_properties_values().
397 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
398 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
399 _java_home = new SystemProperty("java.home", nullptr, true);
400 _java_class_path = new SystemProperty("java.class.path", "", true);
401 // jdk.boot.class.path.append is a non-writeable, internal property.
402 // It can only be set by either:
403 // - -Xbootclasspath/a:
404 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
405 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
406
407 // Add to System Property list.
408 PropertyList_add(&_system_properties, _sun_boot_library_path);
409 PropertyList_add(&_system_properties, _java_library_path);
410 PropertyList_add(&_system_properties, _java_home);
411 PropertyList_add(&_system_properties, _java_class_path);
412 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
413 PropertyList_add(&_system_properties, _vm_info);
414
415 // Set OS specific system properties values
416 os::init_system_properties_values();
417 }
418
419 // Update/Initialize System properties after JDK version number is known
420 void Arguments::init_version_specific_system_properties() {
421 enum { bufsz = 16 };
422 char buffer[bufsz];
423 const char* spec_vendor = "Oracle Corporation";
424 uint32_t spec_version = JDK_Version::current().major_version();
425
426 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
427
428 PropertyList_add(&_system_properties,
429 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
430 PropertyList_add(&_system_properties,
431 new SystemProperty("java.vm.specification.version", buffer, false));
432 PropertyList_add(&_system_properties,
433 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
434 }
435
436 /*
437 * -XX argument processing:
438 *
439 * -XX arguments are defined in several places, such as:
440 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
441 * -XX arguments are parsed in parse_argument().
442 * -XX argument bounds checking is done in check_vm_args_consistency().
443 *
444 * Over time -XX arguments may change. There are mechanisms to handle common cases:
445 *
446 * ALIASED: An option that is simply another name for another option. This is often
447 * part of the process of deprecating a flag, but not all aliases need
448 * to be deprecated.
449 *
450 * Create an alias for an option by adding the old and new option names to the
451 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
452 *
453 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
454 * support may be removed in the future. Both regular and aliased options may be
455 * deprecated.
456 *
457 * Add a deprecation warning for an option (or alias) by adding an entry in the
458 * "special_jvm_flags" table and setting the "deprecated_in" field.
459 * Often an option "deprecated" in one major release will
460 * be made "obsolete" in the next. In this case the entry should also have its
461 * "obsolete_in" field set.
462 *
463 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
464 * on the command line. A warning is printed to let the user know that option might not
465 * be accepted in the future.
466 *
467 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
468 * table and setting the "obsolete_in" field.
469 *
470 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
471 * to the current JDK version. The system will flatly refuse to admit the existence of
472 * the flag. This allows a flag to die automatically over JDK releases.
473 *
474 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
475 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
476 * - Newly obsolete or expired deprecated options should have their global variable
477 * definitions removed (from globals.hpp, etc) and related implementations removed.
478 *
479 * Recommended approach for removing options:
480 *
481 * To remove options commonly used by customers (e.g. product -XX options), use
482 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
483 *
484 * To remove internal options (e.g. diagnostic, experimental, develop options), use
485 * a 2-step model adding major release numbers to the obsolete and expire columns.
486 *
487 * To change the name of an option, use the alias table as well as a 2-step
488 * model adding major release numbers to the deprecate and expire columns.
489 * Think twice about aliasing commonly used customer options.
490 *
491 * There are times when it is appropriate to leave a future release number as undefined.
492 *
493 * Tests: Aliases should be tested in VMAliasOptions.java.
494 * Deprecated options should be tested in VMDeprecatedOptions.java.
495 */
496
497 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
498 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
499 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
500 // the command-line as usual, but will issue a warning.
501 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
502 // the command-line, while issuing a warning and ignoring the flag value.
503 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
504 // existence of the flag.
505 //
506 // MANUAL CLEANUP ON JDK VERSION UPDATES:
507 // This table ensures that the handling of options will update automatically when the JDK
508 // version is incremented, but the source code needs to be cleanup up manually:
509 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
510 // variable should be removed, as well as users of the variable.
511 // - As "deprecated" options age into "obsolete" options, move the entry into the
512 // "Obsolete Flags" section of the table.
513 // - All expired options should be removed from the table.
514 static SpecialFlag const special_jvm_flags[] = {
515 // -------------- Deprecated Flags --------------
516 // --- Non-alias flags - sorted by obsolete_in then expired_in:
517 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
518 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
520 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
521 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
522 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
523 #ifdef LINUX
524 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
525 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
526 #endif
527 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
528 #ifdef _LP64
529 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
530 #endif
531 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
532 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
533
534 // -------------- Obsolete Flags - sorted by expired_in --------------
535
536 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
537 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
538 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
539
540 #ifdef ASSERT
541 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
542 #endif
543
544 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
545 // These entries will generate build errors. Their purpose is to test the macros.
546 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
547 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
548 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
549 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
550 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
551 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
552 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
553 #endif
554
555 { nullptr, JDK_Version(0), JDK_Version(0) }
556 };
557
558 // Flags that are aliases for other flags.
559 typedef struct {
560 const char* alias_name;
561 const char* real_name;
562 } AliasedFlag;
563
564 static AliasedFlag const aliased_jvm_flags[] = {
565 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
566 { nullptr, nullptr}
567 };
568
569 // Return true if "v" is less than "other", where "other" may be "undefined".
570 static bool version_less_than(JDK_Version v, JDK_Version other) {
571 assert(!v.is_undefined(), "must be defined");
572 if (!other.is_undefined() && v.compare(other) >= 0) {
573 return false;
574 } else {
575 return true;
576 }
577 }
578
579 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
580 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
581 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
582 flag = special_jvm_flags[i];
583 return true;
584 }
585 }
586 return false;
587 }
588
589 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
590 assert(version != nullptr, "Must provide a version buffer");
591 SpecialFlag flag;
592 if (lookup_special_flag(flag_name, flag)) {
593 if (!flag.obsolete_in.is_undefined()) {
594 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
595 *version = flag.obsolete_in;
596 // This flag may have been marked for obsoletion in this version, but we may not
597 // have actually removed it yet. Rather than ignoring it as soon as we reach
598 // this version we allow some time for the removal to happen. So if the flag
599 // still actually exists we process it as normal, but issue an adjusted warning.
600 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
601 if (real_flag != nullptr) {
602 char version_str[256];
603 version->to_string(version_str, sizeof(version_str));
604 warning("Temporarily processing option %s; support is scheduled for removal in %s",
605 flag_name, version_str);
606 return false;
607 }
608 return true;
609 }
610 }
611 }
612 return false;
613 }
614
615 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
616 assert(version != nullptr, "Must provide a version buffer");
617 SpecialFlag flag;
618 if (lookup_special_flag(flag_name, flag)) {
619 if (!flag.deprecated_in.is_undefined()) {
620 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
621 version_less_than(JDK_Version::current(), flag.expired_in)) {
622 *version = flag.deprecated_in;
623 return 1;
624 } else {
625 return -1;
626 }
627 }
628 }
629 return 0;
630 }
631
632 const char* Arguments::real_flag_name(const char *flag_name) {
633 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
634 const AliasedFlag& flag_status = aliased_jvm_flags[i];
635 if (strcmp(flag_status.alias_name, flag_name) == 0) {
636 return flag_status.real_name;
637 }
638 }
639 return flag_name;
640 }
641
642 #ifdef ASSERT
643 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
644 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
645 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
646 return true;
647 }
648 }
649 return false;
650 }
651
652 // Verifies the correctness of the entries in the special_jvm_flags table.
653 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
654 // version being earlier than the deprecation version, then a warning is issued
655 // and verification fails - by returning false. If it is detected that the table
656 // is out of date, with respect to the current version, then ideally a warning is
657 // issued but verification does not fail. This allows the VM to operate when the
658 // version is first updated, without needing to update all the impacted flags at
659 // the same time. In practice we can't issue the warning immediately when the version
660 // is updated as it occurs for every test and some tests are not prepared to handle
661 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
662 // if the check_globals flag is true, and in addition allow a grace period and only
663 // check for stale flags when we hit build 25 (which is far enough into the 6 month
664 // release cycle that all flag updates should have been processed, whilst still
665 // leaving time to make the change before RDP2).
666 // We use a gtest to call this, passing true, so that we can detect stale flags before
667 // the end of the release cycle.
668
669 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
670
671 bool Arguments::verify_special_jvm_flags(bool check_globals) {
672 bool success = true;
673 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
674 const SpecialFlag& flag = special_jvm_flags[i];
675 if (lookup_special_flag(flag.name, i)) {
676 warning("Duplicate special flag declaration \"%s\"", flag.name);
677 success = false;
678 }
679 if (flag.deprecated_in.is_undefined() &&
680 flag.obsolete_in.is_undefined()) {
681 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
682 success = false;
683 }
684
685 if (!flag.deprecated_in.is_undefined()) {
686 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
687 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
688 success = false;
689 }
690
691 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
692 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
693 success = false;
694 }
695 }
696
697 if (!flag.obsolete_in.is_undefined()) {
698 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
699 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
700 success = false;
701 }
702
703 // if flag has become obsolete it should not have a "globals" flag defined anymore.
704 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
705 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
706 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
707 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
708 success = false;
709 }
710 }
711
712 } else if (!flag.expired_in.is_undefined()) {
713 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
714 success = false;
715 }
716
717 if (!flag.expired_in.is_undefined()) {
718 // if flag has become expired it should not have a "globals" flag defined anymore.
719 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
720 !version_less_than(JDK_Version::current(), flag.expired_in)) {
721 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
722 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
723 success = false;
724 }
725 }
726 }
727 }
728 return success;
729 }
730 #endif
731
732 bool Arguments::atojulong(const char *s, julong* result) {
733 return parse_integer(s, result);
734 }
735
736 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
737 if (size < min_size) return arg_too_small;
738 if (size > max_size) return arg_too_big;
739 return arg_in_range;
740 }
741
742 // Describe an argument out of range error
743 void Arguments::describe_range_error(ArgsRange errcode) {
744 switch(errcode) {
745 case arg_too_big:
746 jio_fprintf(defaultStream::error_stream(),
747 "The specified size exceeds the maximum "
748 "representable size.\n");
749 break;
750 case arg_too_small:
751 case arg_unreadable:
752 case arg_in_range:
753 // do nothing for now
754 break;
755 default:
756 ShouldNotReachHere();
757 }
758 }
759
760 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
761 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
762 return true;
763 } else {
764 return false;
765 }
766 }
767
768 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
769 // strtod allows leading whitespace, but our flag format does not.
770 if (*value == '\0' || isspace((unsigned char) *value)) {
771 return false;
772 }
773 char* end;
774 errno = 0;
775 double v = strtod(value, &end);
776 if ((errno != 0) || (*end != 0)) {
777 return false;
778 }
779 if (g_isnan(v) || !g_isfinite(v)) {
780 // Currently we cannot handle these special values.
781 return false;
782 }
783
784 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
785 return true;
786 }
787 return false;
788 }
789
790 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
791 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
792
793 if (flag->is_int()) {
794 int v;
795 if (parse_integer(value, &v)) {
796 result = JVMFlagAccess::set_int(flag, &v, origin);
797 }
798 } else if (flag->is_uint()) {
799 uint v;
800 if (parse_integer(value, &v)) {
801 result = JVMFlagAccess::set_uint(flag, &v, origin);
802 }
803 } else if (flag->is_intx()) {
804 intx v;
805 if (parse_integer(value, &v)) {
806 result = JVMFlagAccess::set_intx(flag, &v, origin);
807 }
808 } else if (flag->is_uintx()) {
809 uintx v;
810 if (parse_integer(value, &v)) {
811 result = JVMFlagAccess::set_uintx(flag, &v, origin);
812 }
813 } else if (flag->is_uint64_t()) {
814 uint64_t v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
817 }
818 } else if (flag->is_size_t()) {
819 size_t v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_size_t(flag, &v, origin);
822 }
823 }
824
825 return result == JVMFlag::SUCCESS;
826 }
827
828 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
829 if (value[0] == '\0') {
830 value = nullptr;
831 }
832 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
833 // Contract: JVMFlag always returns a pointer that needs freeing.
834 FREE_C_HEAP_ARRAY(char, value);
835 return true;
836 }
837
838 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
839 const char* old_value = "";
840 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
841 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
842 size_t new_len = strlen(new_value);
843 const char* value;
844 char* free_this_too = nullptr;
845 if (old_len == 0) {
846 value = new_value;
847 } else if (new_len == 0) {
848 value = old_value;
849 } else {
850 size_t length = old_len + 1 + new_len + 1;
851 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
852 // each new setting adds another LINE to the switch:
853 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
854 value = buf;
855 free_this_too = buf;
856 }
857 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
858 // JVMFlag always returns a pointer that needs freeing.
859 FREE_C_HEAP_ARRAY(char, value);
860 // JVMFlag made its own copy, so I must delete my own temp. buffer.
861 FREE_C_HEAP_ARRAY(char, free_this_too);
862 return true;
863 }
864
865 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
866 const char* real_name = real_flag_name(arg);
867 JDK_Version since = JDK_Version();
868 switch (is_deprecated_flag(arg, &since)) {
869 case -1: {
870 // Obsolete or expired, so don't process normally,
871 // but allow for an obsolete flag we're still
872 // temporarily allowing.
873 if (!is_obsolete_flag(arg, &since)) {
874 return real_name;
875 }
876 // Note if we're not considered obsolete then we can't be expired either
877 // as obsoletion must come first.
878 return nullptr;
879 }
880 case 0:
881 return real_name;
882 case 1: {
883 char version[256];
884 since.to_string(version, sizeof(version));
885 if (real_name != arg) {
886 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
887 arg, version, real_name);
888 } else {
889 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
890 arg, version);
891 }
892 return real_name;
893 }
894 }
895 ShouldNotReachHere();
896 return nullptr;
897 }
898
899 #define BUFLEN 255
900
901 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
902 char name_copied[BUFLEN+1];
903 if (name[name_length] != 0) {
904 if (name_length > BUFLEN) {
905 return nullptr;
906 } else {
907 strncpy(name_copied, name, name_length);
908 name_copied[name_length] = '\0';
909 name = name_copied;
910 }
911 }
912
913 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
914 if (real_name == nullptr) {
915 return nullptr;
916 }
917 JVMFlag* flag = JVMFlag::find_flag(real_name);
918 return flag;
919 }
920
921 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
922 bool is_bool = false;
923 bool bool_val = false;
924 char c = *arg;
925 if (c == '+' || c == '-') {
926 is_bool = true;
927 bool_val = (c == '+');
928 arg++;
929 }
930
931 const char* name = arg;
932 while (true) {
933 c = *arg;
934 if (isalnum(c) || (c == '_')) {
935 ++arg;
936 } else {
937 break;
938 }
939 }
940
941 size_t name_len = size_t(arg - name);
942 if (name_len == 0) {
943 return false;
944 }
945
946 JVMFlag* flag = find_jvm_flag(name, name_len);
947 if (flag == nullptr) {
948 return false;
949 }
950
951 if (is_bool) {
952 if (*arg != 0) {
953 // Error -- extra characters such as -XX:+BoolFlag=123
954 return false;
955 }
956 return set_bool_flag(flag, bool_val, origin);
957 }
958
959 if (arg[0] == '=') {
960 const char* value = arg + 1;
961 if (flag->is_ccstr()) {
962 if (flag->ccstr_accumulates()) {
963 return append_to_string_flag(flag, value, origin);
964 } else {
965 return set_string_flag(flag, value, origin);
966 }
967 } else if (flag->is_double()) {
968 return set_fp_numeric_flag(flag, value, origin);
969 } else {
970 return set_numeric_flag(flag, value, origin);
971 }
972 }
973
974 if (arg[0] == ':' && arg[1] == '=') {
975 // -XX:Foo:=xxx will reset the string flag to the given value.
976 const char* value = arg + 2;
977 return set_string_flag(flag, value, origin);
978 }
979
980 return false;
981 }
982
983 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
984 assert(bldarray != nullptr, "illegal argument");
985
986 if (arg == nullptr) {
987 return;
988 }
989
990 int new_count = *count + 1;
991
992 // expand the array and add arg to the last element
993 if (*bldarray == nullptr) {
994 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
995 } else {
996 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
997 }
998 (*bldarray)[*count] = os::strdup_check_oom(arg);
999 *count = new_count;
1000 }
1001
1002 void Arguments::build_jvm_args(const char* arg) {
1003 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1004 }
1005
1006 void Arguments::build_jvm_flags(const char* arg) {
1007 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1008 }
1009
1010 // utility function to return a string that concatenates all
1011 // strings in a given char** array
1012 const char* Arguments::build_resource_string(char** args, int count) {
1013 if (args == nullptr || count == 0) {
1014 return nullptr;
1015 }
1016 size_t length = 0;
1017 for (int i = 0; i < count; i++) {
1018 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1019 }
1020 char* s = NEW_RESOURCE_ARRAY(char, length);
1021 char* dst = s;
1022 for (int j = 0; j < count; j++) {
1023 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1024 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1025 dst += offset;
1026 length -= offset;
1027 }
1028 return (const char*) s;
1029 }
1030
1031 void Arguments::print_on(outputStream* st) {
1032 st->print_cr("VM Arguments:");
1033 if (num_jvm_flags() > 0) {
1034 st->print("jvm_flags: "); print_jvm_flags_on(st);
1035 st->cr();
1036 }
1037 if (num_jvm_args() > 0) {
1038 st->print("jvm_args: "); print_jvm_args_on(st);
1039 st->cr();
1040 }
1041 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1042 if (_java_class_path != nullptr) {
1043 char* path = _java_class_path->value();
1044 size_t len = strlen(path);
1045 st->print("java_class_path (initial): ");
1046 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1047 if (len == 0) {
1048 st->print_raw_cr("<not set>");
1049 } else {
1050 st->print_raw_cr(path, len);
1051 }
1052 }
1053 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1054 }
1055
1056 void Arguments::print_summary_on(outputStream* st) {
1057 // Print the command line. Environment variables that are helpful for
1058 // reproducing the problem are written later in the hs_err file.
1059 // flags are from setting file
1060 if (num_jvm_flags() > 0) {
1061 st->print_raw("Settings File: ");
1062 print_jvm_flags_on(st);
1063 st->cr();
1064 }
1065 // args are the command line and environment variable arguments.
1066 st->print_raw("Command Line: ");
1067 if (num_jvm_args() > 0) {
1068 print_jvm_args_on(st);
1069 }
1070 // this is the classfile and any arguments to the java program
1071 if (java_command() != nullptr) {
1072 st->print("%s", java_command());
1073 }
1074 st->cr();
1075 }
1076
1077 void Arguments::print_jvm_flags_on(outputStream* st) {
1078 if (_num_jvm_flags > 0) {
1079 for (int i=0; i < _num_jvm_flags; i++) {
1080 st->print("%s ", _jvm_flags_array[i]);
1081 }
1082 }
1083 }
1084
1085 void Arguments::print_jvm_args_on(outputStream* st) {
1086 if (_num_jvm_args > 0) {
1087 for (int i=0; i < _num_jvm_args; i++) {
1088 st->print("%s ", _jvm_args_array[i]);
1089 }
1090 }
1091 }
1092
1093 bool Arguments::process_argument(const char* arg,
1094 jboolean ignore_unrecognized,
1095 JVMFlagOrigin origin) {
1096 JDK_Version since = JDK_Version();
1097
1098 if (parse_argument(arg, origin)) {
1099 return true;
1100 }
1101
1102 // Determine if the flag has '+', '-', or '=' characters.
1103 bool has_plus_minus = (*arg == '+' || *arg == '-');
1104 const char* const argname = has_plus_minus ? arg + 1 : arg;
1105
1106 size_t arg_len;
1107 const char* equal_sign = strchr(argname, '=');
1108 if (equal_sign == nullptr) {
1109 arg_len = strlen(argname);
1110 } else {
1111 arg_len = equal_sign - argname;
1112 }
1113
1114 // Only make the obsolete check for valid arguments.
1115 if (arg_len <= BUFLEN) {
1116 // Construct a string which consists only of the argument name without '+', '-', or '='.
1117 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1118 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1119 if (is_obsolete_flag(stripped_argname, &since)) {
1120 char version[256];
1121 since.to_string(version, sizeof(version));
1122 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1123 return true;
1124 }
1125 }
1126
1127 // For locked flags, report a custom error message if available.
1128 // Otherwise, report the standard unrecognized VM option.
1129 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1130 if (found_flag != nullptr) {
1131 char locked_message_buf[BUFLEN];
1132 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1133 if (strlen(locked_message_buf) != 0) {
1134 #ifdef PRODUCT
1135 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1136 if (ignore_unrecognized && mismatched) {
1137 return true;
1138 }
1139 #endif
1140 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1141 }
1142 if (found_flag->is_bool() && !has_plus_minus) {
1143 jio_fprintf(defaultStream::error_stream(),
1144 "Missing +/- setting for VM option '%s'\n", argname);
1145 } else if (!found_flag->is_bool() && has_plus_minus) {
1146 jio_fprintf(defaultStream::error_stream(),
1147 "Unexpected +/- setting in VM option '%s'\n", argname);
1148 } else {
1149 jio_fprintf(defaultStream::error_stream(),
1150 "Improperly specified VM option '%s'\n", argname);
1151 }
1152 } else {
1153 if (ignore_unrecognized) {
1154 return true;
1155 }
1156 jio_fprintf(defaultStream::error_stream(),
1157 "Unrecognized VM option '%s'\n", argname);
1158 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1159 if (fuzzy_matched != nullptr) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Did you mean '%s%s%s'?\n",
1162 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1163 fuzzy_matched->name(),
1164 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1165 }
1166 }
1167
1168 // allow for commandline "commenting out" options like -XX:#+Verbose
1169 return arg[0] == '#';
1170 }
1171
1172 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1173 FILE* stream = os::fopen(file_name, "rb");
1174 if (stream == nullptr) {
1175 if (should_exist) {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Could not open settings file %s\n", file_name);
1178 return false;
1179 } else {
1180 return true;
1181 }
1182 }
1183
1184 char token[1024];
1185 int pos = 0;
1186
1187 bool in_white_space = true;
1188 bool in_comment = false;
1189 bool in_quote = false;
1190 int quote_c = 0;
1191 bool result = true;
1192
1193 int c = getc(stream);
1194 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1195 if (in_white_space) {
1196 if (in_comment) {
1197 if (c == '\n') in_comment = false;
1198 } else {
1199 if (c == '#') in_comment = true;
1200 else if (!isspace((unsigned char) c)) {
1201 in_white_space = false;
1202 token[pos++] = checked_cast<char>(c);
1203 }
1204 }
1205 } else {
1206 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1207 // token ends at newline, or at unquoted whitespace
1208 // this allows a way to include spaces in string-valued options
1209 token[pos] = '\0';
1210 logOption(token);
1211 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1212 build_jvm_flags(token);
1213 pos = 0;
1214 in_white_space = true;
1215 in_quote = false;
1216 } else if (!in_quote && (c == '\'' || c == '"')) {
1217 in_quote = true;
1218 quote_c = c;
1219 } else if (in_quote && (c == quote_c)) {
1220 in_quote = false;
1221 } else {
1222 token[pos++] = checked_cast<char>(c);
1223 }
1224 }
1225 c = getc(stream);
1226 }
1227 if (pos > 0) {
1228 token[pos] = '\0';
1229 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1230 build_jvm_flags(token);
1231 }
1232 fclose(stream);
1233 return result;
1234 }
1235
1236 //=============================================================================================================
1237 // Parsing of properties (-D)
1238
1239 const char* Arguments::get_property(const char* key) {
1240 return PropertyList_get_value(system_properties(), key);
1241 }
1242
1243 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1244 const char* eq = strchr(prop, '=');
1245 const char* key;
1246 const char* value = "";
1247
1248 if (eq == nullptr) {
1249 // property doesn't have a value, thus use passed string
1250 key = prop;
1251 } else {
1252 // property have a value, thus extract it and save to the
1253 // allocated string
1254 size_t key_len = eq - prop;
1255 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1256
1257 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1258 key = tmp_key;
1259
1260 value = &prop[key_len + 1];
1261 }
1262
1263 if (internal == ExternalProperty) {
1264 CDSConfig::check_incompatible_property(key, value);
1265 }
1266
1267 if (strcmp(key, "java.compiler") == 0) {
1268 // we no longer support java.compiler system property, log a warning and let it get
1269 // passed to Java, like any other system property
1270 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1271 // for applications using NONE or empty value, log a more informative message
1272 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1273 } else {
1274 warning("The java.compiler system property is obsolete and no longer supported.");
1275 }
1276 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1277 // append is true, writable is true, internal is false
1278 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1279 WriteableProperty, ExternalProperty);
1280 } else {
1281 if (strcmp(key, "sun.java.command") == 0) {
1282 char *old_java_command = _java_command;
1283 _java_command = os::strdup_check_oom(value, mtArguments);
1284 if (old_java_command != nullptr) {
1285 os::free(old_java_command);
1286 }
1287 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1288 // If this property is set on the command line then its value will be
1289 // displayed in VM error logs as the URL at which to submit such logs.
1290 // Normally the URL displayed in error logs is different from the value
1291 // of this system property, so a different property should have been
1292 // used here, but we leave this as-is in case someone depends upon it.
1293 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1294 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1295 // its value without going through the property list or making a Java call.
1296 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1297 if (old_java_vendor_url_bug != nullptr) {
1298 os::free((void *)old_java_vendor_url_bug);
1299 }
1300 }
1301
1302 // Create new property and add at the end of the list
1303 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1304 }
1305
1306 if (key != prop) {
1307 // SystemProperty copy passed value, thus free previously allocated
1308 // memory
1309 FreeHeap((void *)key);
1310 }
1311
1312 return true;
1313 }
1314
1315 //===========================================================================================================
1316 // Setting int/mixed/comp mode flags
1317
1318 void Arguments::set_mode_flags(Mode mode) {
1319 // Set up default values for all flags.
1320 // If you add a flag to any of the branches below,
1321 // add a default value for it here.
1322 _mode = mode;
1323
1324 // Ensure Agent_OnLoad has the correct initial values.
1325 // This may not be the final mode; mode may change later in onload phase.
1326 PropertyList_unique_add(&_system_properties, "java.vm.info",
1327 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1328
1329 UseInterpreter = true;
1330 UseCompiler = true;
1331 UseLoopCounter = true;
1332
1333 // Default values may be platform/compiler dependent -
1334 // use the saved values
1335 ClipInlining = Arguments::_ClipInlining;
1336 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1337 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1338 BackgroundCompilation = Arguments::_BackgroundCompilation;
1339
1340 // Change from defaults based on mode
1341 switch (mode) {
1342 default:
1343 ShouldNotReachHere();
1344 break;
1345 case _int:
1346 UseCompiler = false;
1347 UseLoopCounter = false;
1348 AlwaysCompileLoopMethods = false;
1349 UseOnStackReplacement = false;
1350 break;
1351 case _mixed:
1352 // same as default
1353 break;
1354 case _comp:
1355 UseInterpreter = false;
1356 BackgroundCompilation = false;
1357 ClipInlining = false;
1358 break;
1359 }
1360 }
1361
1362 // Conflict: required to use shared spaces (-Xshare:on), but
1363 // incompatible command line options were chosen.
1364 void Arguments::no_shared_spaces(const char* message) {
1365 if (RequireSharedSpaces) {
1366 log_error(cds)("%s is incompatible with other specified options.",
1367 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1368 if (CDSConfig::new_aot_flags_used()) {
1369 vm_exit_during_initialization("Unable to use AOT cache", message);
1370 } else {
1371 vm_exit_during_initialization("Unable to use shared archive", message);
1372 }
1373 } else {
1374 if (CDSConfig::new_aot_flags_used()) {
1375 log_warning(cds)("Unable to use AOT cache: %s", message);
1376 } else {
1377 log_info(cds)("Unable to use shared archive: %s", message);
1378 }
1379 UseSharedSpaces = false;
1380 }
1381 }
1382
1383 static void set_object_alignment() {
1384 // Object alignment.
1385 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1386 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1387 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1388 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1389 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1390 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1391
1392 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1393 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1394
1395 // Oop encoding heap max
1396 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1397 }
1398
1399 size_t Arguments::max_heap_for_compressed_oops() {
1400 // Avoid sign flip.
1401 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1402 // We need to fit both the null page and the heap into the memory budget, while
1403 // keeping alignment constraints of the heap. To guarantee the latter, as the
1404 // null page is located before the heap, we pad the null page to the conservative
1405 // maximum alignment that the GC may ever impose upon the heap.
1406 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1407 _conservative_max_heap_alignment);
1408
1409 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1410 NOT_LP64(ShouldNotReachHere(); return 0);
1411 }
1412
1413 void Arguments::set_use_compressed_oops() {
1414 #ifdef _LP64
1415 // MaxHeapSize is not set up properly at this point, but
1416 // the only value that can override MaxHeapSize if we are
1417 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1418 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1419
1420 if (max_heap_size <= max_heap_for_compressed_oops()) {
1421 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1422 FLAG_SET_ERGO(UseCompressedOops, true);
1423 }
1424 } else {
1425 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1426 warning("Max heap size too large for Compressed Oops");
1427 FLAG_SET_DEFAULT(UseCompressedOops, false);
1428 }
1429 }
1430 #endif // _LP64
1431 }
1432
1433 void Arguments::set_conservative_max_heap_alignment() {
1434 // The conservative maximum required alignment for the heap is the maximum of
1435 // the alignments imposed by several sources: any requirements from the heap
1436 // itself and the maximum page size we may run the VM with.
1437 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1438 _conservative_max_heap_alignment = MAX4(heap_alignment,
1439 os::vm_allocation_granularity(),
1440 os::max_page_size(),
1441 GCArguments::compute_heap_alignment());
1442 }
1443
1444 jint Arguments::set_ergonomics_flags() {
1445 GCConfig::initialize();
1446
1447 set_conservative_max_heap_alignment();
1448
1449 #ifdef _LP64
1450 set_use_compressed_oops();
1451
1452 // Also checks that certain machines are slower with compressed oops
1453 // in vm_version initialization code.
1454 #endif // _LP64
1455
1456 return JNI_OK;
1457 }
1458
1459 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1460 size_t max_allocatable;
1461 size_t result = limit;
1462 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1463 // The AggressiveHeap check is a temporary workaround to avoid calling
1464 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1465 // selected. This works because AggressiveHeap implies UseParallelGC
1466 // where we know the ratio will be 1. Once the AggressiveHeap option is
1467 // removed, this can be cleaned up.
1468 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1469 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1470 result = MIN2(result, max_allocatable / fraction);
1471 }
1472 return result;
1473 }
1474
1475 // Use static initialization to get the default before parsing
1476 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1477
1478 void Arguments::set_heap_size() {
1479 julong phys_mem;
1480
1481 // If the user specified one of these options, they
1482 // want specific memory sizing so do not limit memory
1483 // based on compressed oops addressability.
1484 // Also, memory limits will be calculated based on
1485 // available os physical memory, not our MaxRAM limit,
1486 // unless MaxRAM is also specified.
1487 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1488 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1489 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1490 !FLAG_IS_DEFAULT(MaxRAM));
1491 if (override_coop_limit) {
1492 if (FLAG_IS_DEFAULT(MaxRAM)) {
1493 phys_mem = os::physical_memory();
1494 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1495 } else {
1496 phys_mem = (julong)MaxRAM;
1497 }
1498 } else {
1499 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1500 : (julong)MaxRAM;
1501 }
1502
1503 // If the maximum heap size has not been set with -Xmx,
1504 // then set it as fraction of the size of physical memory,
1505 // respecting the maximum and minimum sizes of the heap.
1506 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1507 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1508 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1509 if (reasonable_min < MaxHeapSize) {
1510 // Small physical memory, so use a minimum fraction of it for the heap
1511 reasonable_max = reasonable_min;
1512 } else {
1513 // Not-small physical memory, so require a heap at least
1514 // as large as MaxHeapSize
1515 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1516 }
1517
1518 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1519 // Limit the heap size to ErgoHeapSizeLimit
1520 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1521 }
1522
1523 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1524
1525 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1526 // An initial heap size was specified on the command line,
1527 // so be sure that the maximum size is consistent. Done
1528 // after call to limit_heap_by_allocatable_memory because that
1529 // method might reduce the allocation size.
1530 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1531 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1532 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1533 }
1534
1535 #ifdef _LP64
1536 if (UseCompressedOops || UseCompressedClassPointers) {
1537 // HeapBaseMinAddress can be greater than default but not less than.
1538 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1539 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1540 // matches compressed oops printing flags
1541 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1542 " (%zuG) which is greater than value given %zu",
1543 DefaultHeapBaseMinAddress,
1544 DefaultHeapBaseMinAddress/G,
1545 HeapBaseMinAddress);
1546 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1547 }
1548 }
1549 }
1550 if (UseCompressedOops) {
1551 // Limit the heap size to the maximum possible when using compressed oops
1552 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1553
1554 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1555 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1556 // but it should be not less than default MaxHeapSize.
1557 max_coop_heap -= HeapBaseMinAddress;
1558 }
1559
1560 // If user specified flags prioritizing os physical
1561 // memory limits, then disable compressed oops if
1562 // limits exceed max_coop_heap and UseCompressedOops
1563 // was not specified.
1564 if (reasonable_max > max_coop_heap) {
1565 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1566 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1567 " max heap %zu > compressed oop heap %zu. "
1568 "Please check the setting of MaxRAMPercentage %5.2f."
1569 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1570 FLAG_SET_ERGO(UseCompressedOops, false);
1571 } else {
1572 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1573 }
1574 }
1575 }
1576 #endif // _LP64
1577
1578 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1579 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1580 }
1581
1582 // If the minimum or initial heap_size have not been set or requested to be set
1583 // ergonomically, set them accordingly.
1584 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1585 julong reasonable_minimum = (julong)(OldSize + NewSize);
1586
1587 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1588
1589 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1590
1591 if (InitialHeapSize == 0) {
1592 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1593 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1594
1595 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1596 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1597
1598 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1599 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1600 }
1601 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1602 // synchronize with InitialHeapSize to avoid errors with the default value.
1603 if (MinHeapSize == 0) {
1604 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1605 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1606 }
1607 }
1608 }
1609
1610 // This option inspects the machine and attempts to set various
1611 // parameters to be optimal for long-running, memory allocation
1612 // intensive jobs. It is intended for machines with large
1613 // amounts of cpu and memory.
1614 jint Arguments::set_aggressive_heap_flags() {
1615 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1616 // VM, but we may not be able to represent the total physical memory
1617 // available (like having 8gb of memory on a box but using a 32bit VM).
1618 // Thus, we need to make sure we're using a julong for intermediate
1619 // calculations.
1620 julong initHeapSize;
1621 julong total_memory = os::physical_memory();
1622
1623 if (total_memory < (julong) 256 * M) {
1624 jio_fprintf(defaultStream::error_stream(),
1625 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1626 vm_exit(1);
1627 }
1628
1629 // The heap size is half of available memory, or (at most)
1630 // all of possible memory less 160mb (leaving room for the OS
1631 // when using ISM). This is the maximum; because adaptive sizing
1632 // is turned on below, the actual space used may be smaller.
1633
1634 initHeapSize = MIN2(total_memory / (julong) 2,
1635 total_memory - (julong) 160 * M);
1636
1637 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1638
1639 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1640 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1641 return JNI_EINVAL;
1642 }
1643 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1644 return JNI_EINVAL;
1645 }
1646 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1647 return JNI_EINVAL;
1648 }
1649 }
1650 if (FLAG_IS_DEFAULT(NewSize)) {
1651 // Make the young generation 3/8ths of the total heap.
1652 if (FLAG_SET_CMDLINE(NewSize,
1653 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1654 return JNI_EINVAL;
1655 }
1656 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1657 return JNI_EINVAL;
1658 }
1659 }
1660
1661 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1662 FLAG_SET_DEFAULT(UseLargePages, true);
1663 #endif
1664
1665 // Increase some data structure sizes for efficiency
1666 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1667 return JNI_EINVAL;
1668 }
1669 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672
1673 // See the OldPLABSize comment below, but replace 'after promotion'
1674 // with 'after copying'. YoungPLABSize is the size of the survivor
1675 // space per-gc-thread buffers. The default is 4kw.
1676 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1677 return JNI_EINVAL;
1678 }
1679
1680 // OldPLABSize is the size of the buffers in the old gen that
1681 // UseParallelGC uses to promote live data that doesn't fit in the
1682 // survivor spaces. At any given time, there's one for each gc thread.
1683 // The default size is 1kw. These buffers are rarely used, since the
1684 // survivor spaces are usually big enough. For specjbb, however, there
1685 // are occasions when there's lots of live data in the young gen
1686 // and we end up promoting some of it. We don't have a definite
1687 // explanation for why bumping OldPLABSize helps, but the theory
1688 // is that a bigger PLAB results in retaining something like the
1689 // original allocation order after promotion, which improves mutator
1690 // locality. A minor effect may be that larger PLABs reduce the
1691 // number of PLAB allocation events during gc. The value of 8kw
1692 // was arrived at by experimenting with specjbb.
1693 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1694 return JNI_EINVAL;
1695 }
1696
1697 // Enable parallel GC and adaptive generation sizing
1698 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1699 return JNI_EINVAL;
1700 }
1701
1702 // Encourage steady state memory management
1703 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1704 return JNI_EINVAL;
1705 }
1706
1707 return JNI_OK;
1708 }
1709
1710 // This must be called after ergonomics.
1711 void Arguments::set_bytecode_flags() {
1712 if (!RewriteBytecodes) {
1713 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1714 }
1715 }
1716
1717 // Aggressive optimization flags
1718 jint Arguments::set_aggressive_opts_flags() {
1719 #ifdef COMPILER2
1720 if (AggressiveUnboxing) {
1721 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1722 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1723 } else if (!EliminateAutoBox) {
1724 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1725 AggressiveUnboxing = false;
1726 }
1727 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1728 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1729 } else if (!DoEscapeAnalysis) {
1730 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1731 AggressiveUnboxing = false;
1732 }
1733 }
1734 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1735 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1736 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1737 }
1738 // Feed the cache size setting into the JDK
1739 char buffer[1024];
1740 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1741 if (!add_property(buffer)) {
1742 return JNI_ENOMEM;
1743 }
1744 }
1745 #endif
1746
1747 return JNI_OK;
1748 }
1749
1750 //===========================================================================================================
1751
1752 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1753 if (_sun_java_launcher != _default_java_launcher) {
1754 os::free(const_cast<char*>(_sun_java_launcher));
1755 }
1756 _sun_java_launcher = os::strdup_check_oom(launcher);
1757 }
1758
1759 bool Arguments::created_by_java_launcher() {
1760 assert(_sun_java_launcher != nullptr, "property must have value");
1761 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1762 }
1763
1764 bool Arguments::executing_unit_tests() {
1765 return _executing_unit_tests;
1766 }
1767
1768 //===========================================================================================================
1769 // Parsing of main arguments
1770
1771 static unsigned int addreads_count = 0;
1772 static unsigned int addexports_count = 0;
1773 static unsigned int addopens_count = 0;
1774 static unsigned int enable_native_access_count = 0;
1775 static bool patch_mod_javabase = false;
1776
1777 // Check the consistency of vm_init_args
1778 bool Arguments::check_vm_args_consistency() {
1779 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1780 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
1781 return false;
1782 }
1783
1784 // Method for adding checks for flag consistency.
1785 // The intent is to warn the user of all possible conflicts,
1786 // before returning an error.
1787 // Note: Needs platform-dependent factoring.
1788 bool status = true;
1789
1790 if (TLABRefillWasteFraction == 0) {
1791 jio_fprintf(defaultStream::error_stream(),
1792 "TLABRefillWasteFraction should be a denominator, "
1793 "not %zu\n",
1794 TLABRefillWasteFraction);
1795 status = false;
1796 }
1797
1798 status = CompilerConfig::check_args_consistency(status);
1799 #if INCLUDE_JVMCI
1800 if (status && EnableJVMCI) {
1801 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1802 AddProperty, UnwriteableProperty, InternalProperty);
1803 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1804 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1805 return false;
1806 }
1807 }
1808 }
1809 #endif
1810
1811 #if INCLUDE_JFR
1812 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1813 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1814 return false;
1815 }
1816 }
1817 #endif
1818
1819 #ifndef SUPPORT_RESERVED_STACK_AREA
1820 if (StackReservedPages != 0) {
1821 FLAG_SET_CMDLINE(StackReservedPages, 0);
1822 warning("Reserved Stack Area not supported on this platform");
1823 }
1824 #endif
1825
1826 #ifndef _LP64
1827 if (LockingMode == LM_LEGACY) {
1828 FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT);
1829 // Self-forwarding in bit 3 of the mark-word conflicts
1830 // with 4-byte-aligned stack-locks.
1831 warning("Legacy locking not supported on this platform");
1832 }
1833 #endif
1834
1835 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1836 // ObjectMonitorTable requires lightweight locking.
1837 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1838 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1839 }
1840
1841 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1842 if (LockingMode == LM_MONITOR) {
1843 jio_fprintf(defaultStream::error_stream(),
1844 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1845 return false;
1846 }
1847 #endif
1848 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1849 jio_fprintf(defaultStream::error_stream(),
1850 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1851 return false;
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 // Parse JavaVMInitArgs structure
1949
1950 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1951 const JavaVMInitArgs *java_tool_options_args,
1952 const JavaVMInitArgs *java_options_args,
1953 const JavaVMInitArgs *cmd_line_args) {
1954 // Save default settings for some mode flags
1955 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1956 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1957 Arguments::_ClipInlining = ClipInlining;
1958 Arguments::_BackgroundCompilation = BackgroundCompilation;
1959
1960 // Remember the default value of SharedBaseAddress.
1961 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1962
1963 // Setup flags for mixed which is the default
1964 set_mode_flags(_mixed);
1965
1966 // Parse args structure generated from java.base vm options resource
1967 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1968 if (result != JNI_OK) {
1969 return result;
1970 }
1971
1972 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1973 // variable (if present).
1974 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1975 if (result != JNI_OK) {
1976 return result;
1977 }
1978
1979 // Parse args structure generated from the command line flags.
1980 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1981 if (result != JNI_OK) {
1982 return result;
1983 }
1984
1985 // Parse args structure generated from the _JAVA_OPTIONS environment
1986 // variable (if present) (mimics classic VM)
1987 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1988 if (result != JNI_OK) {
1989 return result;
1990 }
1991
1992 // Disable CDS for exploded image
1993 if (!has_jimage()) {
1994 no_shared_spaces("CDS disabled on exploded JDK");
1995 }
1996
1997 // We need to ensure processor and memory resources have been properly
1998 // configured - which may rely on arguments we just processed - before
1999 // doing the final argument processing. Any argument processing that
2000 // needs to know about processor and memory resources must occur after
2001 // this point.
2002
2003 os::init_container_support();
2004
2005 SystemMemoryBarrier::initialize();
2006
2007 // Do final processing now that all arguments have been parsed
2008 result = finalize_vm_init_args();
2009 if (result != JNI_OK) {
2010 return result;
2011 }
2012
2013 return JNI_OK;
2014 }
2015
2016 #if !INCLUDE_JVMTI || INCLUDE_CDS
2017 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2018 // represents a valid JDWP agent. is_path==true denotes that we
2019 // are dealing with -agentpath (case where name is a path), otherwise with
2020 // -agentlib
2021 static bool valid_jdwp_agent(char *name, bool is_path) {
2022 char *_name;
2023 const char *_jdwp = "jdwp";
2024 size_t _len_jdwp, _len_prefix;
2025
2026 if (is_path) {
2027 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2028 return false;
2029 }
2030
2031 _name++; // skip past last path separator
2032 _len_prefix = strlen(JNI_LIB_PREFIX);
2033
2034 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2035 return false;
2036 }
2037
2038 _name += _len_prefix;
2039 _len_jdwp = strlen(_jdwp);
2040
2041 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2042 _name += _len_jdwp;
2043 }
2044 else {
2045 return false;
2046 }
2047
2048 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2049 return false;
2050 }
2051
2052 return true;
2053 }
2054
2055 if (strcmp(name, _jdwp) == 0) {
2056 return true;
2057 }
2058
2059 return false;
2060 }
2061 #endif
2062
2063 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2064 // --patch-module=<module>=<file>(<pathsep><file>)*
2065 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2066 // Find the equal sign between the module name and the path specification
2067 const char* module_equal = strchr(patch_mod_tail, '=');
2068 if (module_equal == nullptr) {
2069 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2070 return JNI_ERR;
2071 } else {
2072 // Pick out the module name
2073 size_t module_len = module_equal - patch_mod_tail;
2074 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2075 if (module_name != nullptr) {
2076 memcpy(module_name, patch_mod_tail, module_len);
2077 *(module_name + module_len) = '\0';
2078 // The path piece begins one past the module_equal sign
2079 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2080 FREE_C_HEAP_ARRAY(char, module_name);
2081 } else {
2082 return JNI_ENOMEM;
2083 }
2084 }
2085 return JNI_OK;
2086 }
2087
2088 // VALUECLASS_STR must match string used in the build
2089 #define VALUECLASS_STR "valueclasses"
2090 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2091
2092 // Finalize --patch-module args and --enable-preview related to value class module patches.
2093 // Create all numbered properties passing module patches.
2094 int Arguments::finalize_patch_module() {
2095 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2096 // are to be patched into the module.
2097 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2098 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2099 if (enable_preview() && EnableValhalla) {
2100 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2101 const char * fileSep = os::file_separator();
2102
2103 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2104 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2105 DIR* dir = os::opendir(valueclasses_dir);
2106 if (dir != nullptr) {
2107 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2108 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2109
2110 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2111 // Test if file ends-with "-valueclasses.jar"
2112 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2113 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2114 continue; // too short or not the expected suffix
2115 }
2116
2117 strcpy(module_name, entry->d_name);
2118 module_name[len] = '\0'; // truncate to just module-name
2119
2120 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2121 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2122 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2123 }
2124 FreeHeap(module_name);
2125 FreeHeap(path);
2126 os::closedir(dir);
2127 }
2128 FreeHeap(valueclasses_dir);
2129 }
2130
2131 // Create numbered properties for each module that has been patched either
2132 // by --patch-module or --enable-preview
2133 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2134 if (_patch_mod_prefix != nullptr) {
2135 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2136 unsigned int patch_mod_count = 0;
2137
2138 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2139 it != _patch_mod_prefix->end(); ++it) {
2140 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2141 (*it)->module_name(), (*it)->path_string());
2142 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2143 FreeHeap(prop_value);
2144 return JNI_ENOMEM;
2145 }
2146 }
2147 FreeHeap(prop_value);
2148 }
2149 return JNI_OK;
2150 }
2151
2152 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2153 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2154 // The min and max sizes match the values in globals.hpp, but scaled
2155 // with K. The values have been chosen so that alignment with page
2156 // size doesn't change the max value, which makes the conversions
2157 // back and forth between Xss value and ThreadStackSize value easier.
2158 // The values have also been chosen to fit inside a 32-bit signed type.
2159 const julong min_ThreadStackSize = 0;
2160 const julong max_ThreadStackSize = 1 * M;
2161
2162 // Make sure the above values match the range set in globals.hpp
2163 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2164 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2165 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2166
2167 const julong min_size = min_ThreadStackSize * K;
2168 const julong max_size = max_ThreadStackSize * K;
2169
2170 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2171
2172 julong size = 0;
2173 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2174 if (errcode != arg_in_range) {
2175 bool silent = (option == nullptr); // Allow testing to silence error messages
2176 if (!silent) {
2177 jio_fprintf(defaultStream::error_stream(),
2178 "Invalid thread stack size: %s\n", option->optionString);
2179 describe_range_error(errcode);
2180 }
2181 return JNI_EINVAL;
2182 }
2183
2184 // Internally track ThreadStackSize in units of 1024 bytes.
2185 const julong size_aligned = align_up(size, K);
2186 assert(size <= size_aligned,
2187 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2188 size, size_aligned);
2189
2190 const julong size_in_K = size_aligned / K;
2191 assert(size_in_K < (julong)max_intx,
2192 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2193 size_in_K);
2194
2195 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2196 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2197 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2198 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2199 max_expanded, size_in_K);
2200
2201 *out_ThreadStackSize = (intx)size_in_K;
2202
2203 return JNI_OK;
2204 }
2205
2206 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2207 // For match_option to return remaining or value part of option string
2208 const char* tail;
2209
2210 // iterate over arguments
2211 for (int index = 0; index < args->nOptions; index++) {
2212 bool is_absolute_path = false; // for -agentpath vs -agentlib
2213
2214 const JavaVMOption* option = args->options + index;
2215
2216 if (!match_option(option, "-Djava.class.path", &tail) &&
2217 !match_option(option, "-Dsun.java.command", &tail) &&
2218 !match_option(option, "-Dsun.java.launcher", &tail)) {
2219
2220 // add all jvm options to the jvm_args string. This string
2221 // is used later to set the java.vm.args PerfData string constant.
2222 // the -Djava.class.path and the -Dsun.java.command options are
2223 // omitted from jvm_args string as each have their own PerfData
2224 // string constant object.
2225 build_jvm_args(option->optionString);
2226 }
2227
2228 // -verbose:[class/module/gc/jni]
2229 if (match_option(option, "-verbose", &tail)) {
2230 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2231 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2232 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2233 } else if (!strcmp(tail, ":module")) {
2234 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2235 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2236 } else if (!strcmp(tail, ":gc")) {
2237 if (_legacyGCLogging.lastFlag == 0) {
2238 _legacyGCLogging.lastFlag = 1;
2239 }
2240 } else if (!strcmp(tail, ":jni")) {
2241 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2242 }
2243 // -da / -ea / -disableassertions / -enableassertions
2244 // These accept an optional class/package name separated by a colon, e.g.,
2245 // -da:java.lang.Thread.
2246 } else if (match_option(option, user_assertion_options, &tail, true)) {
2247 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2248 if (*tail == '\0') {
2249 JavaAssertions::setUserClassDefault(enable);
2250 } else {
2251 assert(*tail == ':', "bogus match by match_option()");
2252 JavaAssertions::addOption(tail + 1, enable);
2253 }
2254 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2255 } else if (match_option(option, system_assertion_options, &tail, false)) {
2256 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2257 JavaAssertions::setSystemClassDefault(enable);
2258 // -bootclasspath:
2259 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2260 jio_fprintf(defaultStream::output_stream(),
2261 "-Xbootclasspath is no longer a supported option.\n");
2262 return JNI_EINVAL;
2263 // -bootclasspath/a:
2264 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2265 Arguments::append_sysclasspath(tail);
2266 // -bootclasspath/p:
2267 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2268 jio_fprintf(defaultStream::output_stream(),
2269 "-Xbootclasspath/p is no longer a supported option.\n");
2270 return JNI_EINVAL;
2271 // -Xrun
2272 } else if (match_option(option, "-Xrun", &tail)) {
2273 if (tail != nullptr) {
2274 const char* pos = strchr(tail, ':');
2275 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2276 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2277 jio_snprintf(name, len + 1, "%s", tail);
2278
2279 char *options = nullptr;
2280 if(pos != nullptr) {
2281 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2282 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2283 }
2284 #if !INCLUDE_JVMTI
2285 if (strcmp(name, "jdwp") == 0) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Debugging agents are not supported in this VM\n");
2288 return JNI_ERR;
2289 }
2290 #endif // !INCLUDE_JVMTI
2291 JvmtiAgentList::add_xrun(name, options, false);
2292 FREE_C_HEAP_ARRAY(char, name);
2293 FREE_C_HEAP_ARRAY(char, options);
2294 }
2295 } else if (match_option(option, "--add-reads=", &tail)) {
2296 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2297 return JNI_ENOMEM;
2298 }
2299 } else if (match_option(option, "--add-exports=", &tail)) {
2300 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2301 return JNI_ENOMEM;
2302 }
2303 } else if (match_option(option, "--add-opens=", &tail)) {
2304 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2305 return JNI_ENOMEM;
2306 }
2307 } else if (match_option(option, "--add-modules=", &tail)) {
2308 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2309 return JNI_ENOMEM;
2310 }
2311 } else if (match_option(option, "--enable-native-access=", &tail)) {
2312 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2313 return JNI_ENOMEM;
2314 }
2315 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2316 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2317 return JNI_ENOMEM;
2318 }
2319 } else if (match_option(option, "--limit-modules=", &tail)) {
2320 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2321 return JNI_ENOMEM;
2322 }
2323 } else if (match_option(option, "--module-path=", &tail)) {
2324 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2325 return JNI_ENOMEM;
2326 }
2327 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2328 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2329 return JNI_ENOMEM;
2330 }
2331 } else if (match_option(option, "--patch-module=", &tail)) {
2332 // --patch-module=<module>=<file>(<pathsep><file>)*
2333 int res = process_patch_mod_option(tail);
2334 if (res != JNI_OK) {
2335 return res;
2336 }
2337 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2338 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2339 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2340 AddProperty, WriteableProperty, InternalProperty);
2341 } else {
2342 jio_fprintf(defaultStream::error_stream(),
2343 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2344 return JNI_ERR;
2345 }
2346 } else if (match_option(option, "--illegal-access=", &tail)) {
2347 char version[256];
2348 JDK_Version::jdk(17).to_string(version, sizeof(version));
2349 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2350 // -agentlib and -agentpath
2351 } else if (match_option(option, "-agentlib:", &tail) ||
2352 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2353 if(tail != nullptr) {
2354 const char* pos = strchr(tail, '=');
2355 char* name;
2356 if (pos == nullptr) {
2357 name = os::strdup_check_oom(tail, mtArguments);
2358 } else {
2359 size_t len = pos - tail;
2360 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2361 memcpy(name, tail, len);
2362 name[len] = '\0';
2363 }
2364
2365 char *options = nullptr;
2366 if(pos != nullptr) {
2367 options = os::strdup_check_oom(pos + 1, mtArguments);
2368 }
2369 #if !INCLUDE_JVMTI
2370 if (valid_jdwp_agent(name, is_absolute_path)) {
2371 jio_fprintf(defaultStream::error_stream(),
2372 "Debugging agents are not supported in this VM\n");
2373 return JNI_ERR;
2374 }
2375 #elif INCLUDE_CDS
2376 if (valid_jdwp_agent(name, is_absolute_path)) {
2377 _has_jdwp_agent = true;
2378 }
2379 #endif // !INCLUDE_JVMTI
2380 JvmtiAgentList::add(name, options, is_absolute_path);
2381 os::free(name);
2382 os::free(options);
2383 }
2384 // -javaagent
2385 } else if (match_option(option, "-javaagent:", &tail)) {
2386 #if !INCLUDE_JVMTI
2387 jio_fprintf(defaultStream::error_stream(),
2388 "Instrumentation agents are not supported in this VM\n");
2389 return JNI_ERR;
2390 #else
2391 if (tail != nullptr) {
2392 size_t length = strlen(tail) + 1;
2393 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2394 jio_snprintf(options, length, "%s", tail);
2395 JvmtiAgentList::add("instrument", options, false);
2396 FREE_C_HEAP_ARRAY(char, options);
2397
2398 // java agents need module java.instrument
2399 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2400 return JNI_ENOMEM;
2401 }
2402 }
2403 #endif // !INCLUDE_JVMTI
2404 // --enable_preview
2405 } else if (match_option(option, "--enable-preview")) {
2406 set_enable_preview();
2407 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2408 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2409 return JNI_EINVAL;
2410 }
2411 // -Xnoclassgc
2412 } else if (match_option(option, "-Xnoclassgc")) {
2413 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2414 return JNI_EINVAL;
2415 }
2416 // -Xbatch
2417 } else if (match_option(option, "-Xbatch")) {
2418 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2419 return JNI_EINVAL;
2420 }
2421 // -Xmn for compatibility with other JVM vendors
2422 } else if (match_option(option, "-Xmn", &tail)) {
2423 julong long_initial_young_size = 0;
2424 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2425 if (errcode != arg_in_range) {
2426 jio_fprintf(defaultStream::error_stream(),
2427 "Invalid initial young generation size: %s\n", option->optionString);
2428 describe_range_error(errcode);
2429 return JNI_EINVAL;
2430 }
2431 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2432 return JNI_EINVAL;
2433 }
2434 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2435 return JNI_EINVAL;
2436 }
2437 // -Xms
2438 } else if (match_option(option, "-Xms", &tail)) {
2439 julong size = 0;
2440 // an initial heap size of 0 means automatically determine
2441 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2442 if (errcode != arg_in_range) {
2443 jio_fprintf(defaultStream::error_stream(),
2444 "Invalid initial heap size: %s\n", option->optionString);
2445 describe_range_error(errcode);
2446 return JNI_EINVAL;
2447 }
2448 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2449 return JNI_EINVAL;
2450 }
2451 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2452 return JNI_EINVAL;
2453 }
2454 // -Xmx
2455 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2456 julong long_max_heap_size = 0;
2457 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2458 if (errcode != arg_in_range) {
2459 jio_fprintf(defaultStream::error_stream(),
2460 "Invalid maximum heap size: %s\n", option->optionString);
2461 describe_range_error(errcode);
2462 return JNI_EINVAL;
2463 }
2464 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2465 return JNI_EINVAL;
2466 }
2467 // Xmaxf
2468 } else if (match_option(option, "-Xmaxf", &tail)) {
2469 char* err;
2470 int maxf = (int)(strtod(tail, &err) * 100);
2471 if (*err != '\0' || *tail == '\0') {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Bad max heap free percentage size: %s\n",
2474 option->optionString);
2475 return JNI_EINVAL;
2476 } else {
2477 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2478 return JNI_EINVAL;
2479 }
2480 }
2481 // Xminf
2482 } else if (match_option(option, "-Xminf", &tail)) {
2483 char* err;
2484 int minf = (int)(strtod(tail, &err) * 100);
2485 if (*err != '\0' || *tail == '\0') {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Bad min heap free percentage size: %s\n",
2488 option->optionString);
2489 return JNI_EINVAL;
2490 } else {
2491 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2492 return JNI_EINVAL;
2493 }
2494 }
2495 // -Xss
2496 } else if (match_option(option, "-Xss", &tail)) {
2497 intx value = 0;
2498 jint err = parse_xss(option, tail, &value);
2499 if (err != JNI_OK) {
2500 return err;
2501 }
2502 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2503 return JNI_EINVAL;
2504 }
2505 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2506 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2507 julong long_ReservedCodeCacheSize = 0;
2508
2509 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2510 if (errcode != arg_in_range) {
2511 jio_fprintf(defaultStream::error_stream(),
2512 "Invalid maximum code cache size: %s.\n", option->optionString);
2513 return JNI_EINVAL;
2514 }
2515 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2516 return JNI_EINVAL;
2517 }
2518 // -green
2519 } else if (match_option(option, "-green")) {
2520 jio_fprintf(defaultStream::error_stream(),
2521 "Green threads support not available\n");
2522 return JNI_EINVAL;
2523 // -native
2524 } else if (match_option(option, "-native")) {
2525 // HotSpot always uses native threads, ignore silently for compatibility
2526 // -Xrs
2527 } else if (match_option(option, "-Xrs")) {
2528 // Classic/EVM option, new functionality
2529 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2530 return JNI_EINVAL;
2531 }
2532 // -Xprof
2533 } else if (match_option(option, "-Xprof")) {
2534 char version[256];
2535 // Obsolete in JDK 10
2536 JDK_Version::jdk(10).to_string(version, sizeof(version));
2537 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2538 // -Xinternalversion
2539 } else if (match_option(option, "-Xinternalversion")) {
2540 jio_fprintf(defaultStream::output_stream(), "%s\n",
2541 VM_Version::internal_vm_info_string());
2542 vm_exit(0);
2543 #ifndef PRODUCT
2544 // -Xprintflags
2545 } else if (match_option(option, "-Xprintflags")) {
2546 JVMFlag::printFlags(tty, false);
2547 vm_exit(0);
2548 #endif
2549 // -D
2550 } else if (match_option(option, "-D", &tail)) {
2551 const char* value;
2552 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2553 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2554 // abort if -Djava.endorsed.dirs is set
2555 jio_fprintf(defaultStream::output_stream(),
2556 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2557 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2558 return JNI_EINVAL;
2559 }
2560 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2561 *value != '\0' && strcmp(value, "\"\"") != 0) {
2562 // abort if -Djava.ext.dirs is set
2563 jio_fprintf(defaultStream::output_stream(),
2564 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2565 return JNI_EINVAL;
2566 }
2567 // Check for module related properties. They must be set using the modules
2568 // options. For example: use "--add-modules=java.sql", not
2569 // "-Djdk.module.addmods=java.sql"
2570 if (is_internal_module_property(option->optionString + 2)) {
2571 needs_module_property_warning = true;
2572 continue;
2573 }
2574 if (!add_property(tail)) {
2575 return JNI_ENOMEM;
2576 }
2577 // Out of the box management support
2578 if (match_option(option, "-Dcom.sun.management", &tail)) {
2579 #if INCLUDE_MANAGEMENT
2580 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2581 return JNI_EINVAL;
2582 }
2583 // management agent in module jdk.management.agent
2584 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2585 return JNI_ENOMEM;
2586 }
2587 #else
2588 jio_fprintf(defaultStream::output_stream(),
2589 "-Dcom.sun.management is not supported in this VM.\n");
2590 return JNI_ERR;
2591 #endif
2592 }
2593 // -Xint
2594 } else if (match_option(option, "-Xint")) {
2595 set_mode_flags(_int);
2596 mode_flag_cmd_line = true;
2597 // -Xmixed
2598 } else if (match_option(option, "-Xmixed")) {
2599 set_mode_flags(_mixed);
2600 mode_flag_cmd_line = true;
2601 // -Xcomp
2602 } else if (match_option(option, "-Xcomp")) {
2603 // for testing the compiler; turn off all flags that inhibit compilation
2604 set_mode_flags(_comp);
2605 mode_flag_cmd_line = true;
2606 // -Xshare:dump
2607 } else if (match_option(option, "-Xshare:dump")) {
2608 CDSConfig::enable_dumping_static_archive();
2609 CDSConfig::set_old_cds_flags_used();
2610 // -Xshare:on
2611 } else if (match_option(option, "-Xshare:on")) {
2612 UseSharedSpaces = true;
2613 RequireSharedSpaces = true;
2614 CDSConfig::set_old_cds_flags_used();
2615 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2616 } else if (match_option(option, "-Xshare:auto")) {
2617 UseSharedSpaces = true;
2618 RequireSharedSpaces = false;
2619 xshare_auto_cmd_line = true;
2620 CDSConfig::set_old_cds_flags_used();
2621 // -Xshare:off
2622 } else if (match_option(option, "-Xshare:off")) {
2623 UseSharedSpaces = false;
2624 RequireSharedSpaces = false;
2625 CDSConfig::set_old_cds_flags_used();
2626 // -Xverify
2627 } else if (match_option(option, "-Xverify", &tail)) {
2628 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2629 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2630 return JNI_EINVAL;
2631 }
2632 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2633 return JNI_EINVAL;
2634 }
2635 } else if (strcmp(tail, ":remote") == 0) {
2636 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2637 return JNI_EINVAL;
2638 }
2639 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2640 return JNI_EINVAL;
2641 }
2642 } else if (strcmp(tail, ":none") == 0) {
2643 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2650 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2651 return JNI_EINVAL;
2652 }
2653 // -Xdebug
2654 } else if (match_option(option, "-Xdebug")) {
2655 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2656 } else if (match_option(option, "-Xloggc:", &tail)) {
2657 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2658 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2659 _legacyGCLogging.lastFlag = 2;
2660 _legacyGCLogging.file = os::strdup_check_oom(tail);
2661 } else if (match_option(option, "-Xlog", &tail)) {
2662 bool ret = false;
2663 if (strcmp(tail, ":help") == 0) {
2664 fileStream stream(defaultStream::output_stream());
2665 LogConfiguration::print_command_line_help(&stream);
2666 vm_exit(0);
2667 } else if (strcmp(tail, ":disable") == 0) {
2668 LogConfiguration::disable_logging();
2669 ret = true;
2670 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2671 const char* async_tail = tail + strlen(":async");
2672 ret = LogConfiguration::parse_async_argument(async_tail);
2673 } else if (*tail == '\0') {
2674 ret = LogConfiguration::parse_command_line_arguments();
2675 assert(ret, "-Xlog without arguments should never fail to parse");
2676 } else if (*tail == ':') {
2677 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2678 }
2679 if (ret == false) {
2680 jio_fprintf(defaultStream::error_stream(),
2681 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2682 tail);
2683 return JNI_EINVAL;
2684 }
2685 // JNI hooks
2686 } else if (match_option(option, "-Xcheck", &tail)) {
2687 if (!strcmp(tail, ":jni")) {
2688 #if !INCLUDE_JNI_CHECK
2689 warning("JNI CHECKING is not supported in this VM");
2690 #else
2691 CheckJNICalls = true;
2692 #endif // INCLUDE_JNI_CHECK
2693 } else if (is_bad_option(option, args->ignoreUnrecognized,
2694 "check")) {
2695 return JNI_EINVAL;
2696 }
2697 } else if (match_option(option, "vfprintf")) {
2698 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2699 } else if (match_option(option, "exit")) {
2700 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2701 } else if (match_option(option, "abort")) {
2702 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2703 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2704 // and the last option wins.
2705 } else if (match_option(option, "-XX:+NeverTenure")) {
2706 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2707 return JNI_EINVAL;
2708 }
2709 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2710 return JNI_EINVAL;
2711 }
2712 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2716 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2717 return JNI_EINVAL;
2718 }
2719 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2726 uint max_tenuring_thresh = 0;
2727 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2728 jio_fprintf(defaultStream::error_stream(),
2729 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2730 return JNI_EINVAL;
2731 }
2732
2733 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2734 return JNI_EINVAL;
2735 }
2736
2737 if (MaxTenuringThreshold == 0) {
2738 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2739 return JNI_EINVAL;
2740 }
2741 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 } else {
2745 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2746 return JNI_EINVAL;
2747 }
2748 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2749 return JNI_EINVAL;
2750 }
2751 }
2752 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2753 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2760 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2767 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2774 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 } else if (match_option(option, "--finalization=", &tail)) {
2781 if (strcmp(tail, "enabled") == 0) {
2782 InstanceKlass::set_finalization_enabled(true);
2783 } else if (strcmp(tail, "disabled") == 0) {
2784 InstanceKlass::set_finalization_enabled(false);
2785 } else {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2788 tail);
2789 return JNI_EINVAL;
2790 }
2791 #if !defined(DTRACE_ENABLED)
2792 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2793 jio_fprintf(defaultStream::error_stream(),
2794 "DTraceMethodProbes flag is not applicable for this configuration\n");
2795 return JNI_EINVAL;
2796 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2797 jio_fprintf(defaultStream::error_stream(),
2798 "DTraceAllocProbes flag is not applicable for this configuration\n");
2799 return JNI_EINVAL;
2800 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2801 jio_fprintf(defaultStream::error_stream(),
2802 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2803 return JNI_EINVAL;
2804 #endif // !defined(DTRACE_ENABLED)
2805 #ifdef ASSERT
2806 } else if (match_option(option, "-XX:+FullGCALot")) {
2807 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2808 return JNI_EINVAL;
2809 }
2810 #endif
2811 #if !INCLUDE_MANAGEMENT
2812 } else if (match_option(option, "-XX:+ManagementServer")) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "ManagementServer is not supported in this VM.\n");
2815 return JNI_ERR;
2816 #endif // INCLUDE_MANAGEMENT
2817 #if INCLUDE_JVMCI
2818 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2819 if (EnableJVMCIProduct) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2822 return JNI_EINVAL;
2823 }
2824 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2825 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2826 if (use_graal_jit) {
2827 const char* jvmci_compiler = get_property("jvmci.Compiler");
2828 if (jvmci_compiler != nullptr) {
2829 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2830 jio_fprintf(defaultStream::error_stream(),
2831 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2832 return JNI_ERR;
2833 }
2834 } else if (!add_property("jvmci.Compiler=graal")) {
2835 return JNI_ENOMEM;
2836 }
2837 }
2838
2839 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2840 if (EnableJVMCIProduct) {
2841 continue;
2842 }
2843 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2844 // Allow this flag if it has been unlocked.
2845 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2846 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2847 jio_fprintf(defaultStream::error_stream(),
2848 "Unable to enable JVMCI in product mode\n");
2849 return JNI_ERR;
2850 }
2851 }
2852 // The flag was locked so process normally to report that error
2853 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2854 return JNI_EINVAL;
2855 }
2856 #endif // INCLUDE_JVMCI
2857 #if INCLUDE_JFR
2858 } else if (match_jfr_option(&option)) {
2859 return JNI_EINVAL;
2860 #endif
2861 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2862 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2863 // already been handled
2864 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2865 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2866 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2867 return JNI_EINVAL;
2868 }
2869 }
2870 // Unknown option
2871 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2872 return JNI_ERR;
2873 }
2874 }
2875
2876 // PrintSharedArchiveAndExit will turn on
2877 // -Xshare:on
2878 // -Xlog:class+path=info
2879 if (PrintSharedArchiveAndExit) {
2880 UseSharedSpaces = true;
2881 RequireSharedSpaces = true;
2882 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2883 }
2884
2885 fix_appclasspath();
2886
2887 return JNI_OK;
2888 }
2889
2890 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2891 if (!allow_cds) {
2892 CDSConfig::set_module_patching_disables_cds();
2893 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2894 CDSConfig::set_java_base_module_patching_disables_cds();
2895 }
2896 }
2897
2898 // Create GrowableArray lazily, only if --patch-module has been specified
2899 if (_patch_mod_prefix == nullptr) {
2900 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2901 }
2902
2903 // Scan patches for matching module
2904 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2905 return (strcmp(module_name, patch->module_name()) == 0);
2906 });
2907 if (i == -1) {
2908 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2909 } else {
2910 if (allow_append) {
2911 // append path to existing module entry
2912 _patch_mod_prefix->at(i)->append_path(path);
2913 } else {
2914 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2915 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2916 } else {
2917 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2918 }
2919 }
2920 }
2921 }
2922
2923 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2924 //
2925 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2926 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2927 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2928 // path is treated as the current directory.
2929 //
2930 // This causes problems with CDS, which requires that all directories specified in the classpath
2931 // must be empty. In most cases, applications do NOT want to load classes from the current
2932 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2933 // scripts compatible with CDS.
2934 void Arguments::fix_appclasspath() {
2935 if (IgnoreEmptyClassPaths) {
2936 const char separator = *os::path_separator();
2937 const char* src = _java_class_path->value();
2938
2939 // skip over all the leading empty paths
2940 while (*src == separator) {
2941 src ++;
2942 }
2943
2944 char* copy = os::strdup_check_oom(src, mtArguments);
2945
2946 // trim all trailing empty paths
2947 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2948 *tail = '\0';
2949 }
2950
2951 char from[3] = {separator, separator, '\0'};
2952 char to [2] = {separator, '\0'};
2953 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2954 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2955 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2956 }
2957
2958 _java_class_path->set_writeable_value(copy);
2959 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2960 }
2961 }
2962
2963 jint Arguments::finalize_vm_init_args() {
2964 // check if the default lib/endorsed directory exists; if so, error
2965 char path[JVM_MAXPATHLEN];
2966 const char* fileSep = os::file_separator();
2967 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2968
2969 DIR* dir = os::opendir(path);
2970 if (dir != nullptr) {
2971 jio_fprintf(defaultStream::output_stream(),
2972 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2973 "in modular form will be supported via the concept of upgradeable modules.\n");
2974 os::closedir(dir);
2975 return JNI_ERR;
2976 }
2977
2978 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2979 dir = os::opendir(path);
2980 if (dir != nullptr) {
2981 jio_fprintf(defaultStream::output_stream(),
2982 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2983 "Use -classpath instead.\n.");
2984 os::closedir(dir);
2985 return JNI_ERR;
2986 }
2987
2988 // This must be done after all arguments have been processed
2989 // and the container support has been initialized since AggressiveHeap
2990 // relies on the amount of total memory available.
2991 if (AggressiveHeap) {
2992 jint result = set_aggressive_heap_flags();
2993 if (result != JNI_OK) {
2994 return result;
2995 }
2996 }
2997
2998 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2999 // but like -Xint, leave compilation thresholds unaffected.
3000 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3001 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3002 set_mode_flags(_int);
3003 }
3004
3005 #ifdef ZERO
3006 // Zero always runs in interpreted mode
3007 set_mode_flags(_int);
3008 #endif
3009
3010 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3011 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3012 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3013 }
3014
3015 #if !COMPILER2_OR_JVMCI
3016 // Don't degrade server performance for footprint
3017 if (FLAG_IS_DEFAULT(UseLargePages) &&
3018 MaxHeapSize < LargePageHeapSizeThreshold) {
3019 // No need for large granularity pages w/small heaps.
3020 // Note that large pages are enabled/disabled for both the
3021 // Java heap and the code cache.
3022 FLAG_SET_DEFAULT(UseLargePages, false);
3023 }
3024
3025 UNSUPPORTED_OPTION(ProfileInterpreter);
3026 #endif
3027
3028 // Parse the CompilationMode flag
3029 if (!CompilationModeFlag::initialize()) {
3030 return JNI_ERR;
3031 }
3032
3033 // finalize --module-patch and related --enable-preview
3034 if (finalize_patch_module() != JNI_OK) {
3035 return JNI_ERR;
3036 }
3037
3038 if (!check_vm_args_consistency()) {
3039 return JNI_ERR;
3040 }
3041
3042 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3043 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3044 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3045
3046 return JNI_OK;
3047 }
3048
3049 // Helper class for controlling the lifetime of JavaVMInitArgs
3050 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3051 // deleted on the destruction of the ScopedVMInitArgs object.
3052 class ScopedVMInitArgs : public StackObj {
3053 private:
3054 JavaVMInitArgs _args;
3055 char* _container_name;
3056 bool _is_set;
3057 char* _vm_options_file_arg;
3058
3059 public:
3060 ScopedVMInitArgs(const char *container_name) {
3061 _args.version = JNI_VERSION_1_2;
3062 _args.nOptions = 0;
3063 _args.options = nullptr;
3064 _args.ignoreUnrecognized = false;
3065 _container_name = (char *)container_name;
3066 _is_set = false;
3067 _vm_options_file_arg = nullptr;
3068 }
3069
3070 // Populates the JavaVMInitArgs object represented by this
3071 // ScopedVMInitArgs object with the arguments in options. The
3072 // allocated memory is deleted by the destructor. If this method
3073 // returns anything other than JNI_OK, then this object is in a
3074 // partially constructed state, and should be abandoned.
3075 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3076 _is_set = true;
3077 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3078 JavaVMOption, options->length(), mtArguments);
3079 if (options_arr == nullptr) {
3080 return JNI_ENOMEM;
3081 }
3082 _args.options = options_arr;
3083
3084 for (int i = 0; i < options->length(); i++) {
3085 options_arr[i] = options->at(i);
3086 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3087 if (options_arr[i].optionString == nullptr) {
3088 // Rely on the destructor to do cleanup.
3089 _args.nOptions = i;
3090 return JNI_ENOMEM;
3091 }
3092 }
3093
3094 _args.nOptions = options->length();
3095 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3096 return JNI_OK;
3097 }
3098
3099 JavaVMInitArgs* get() { return &_args; }
3100 char* container_name() { return _container_name; }
3101 bool is_set() { return _is_set; }
3102 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3103 char* vm_options_file_arg() { return _vm_options_file_arg; }
3104
3105 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3106 if (_vm_options_file_arg != nullptr) {
3107 os::free(_vm_options_file_arg);
3108 }
3109 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3110 }
3111
3112 ~ScopedVMInitArgs() {
3113 if (_vm_options_file_arg != nullptr) {
3114 os::free(_vm_options_file_arg);
3115 }
3116 if (_args.options == nullptr) return;
3117 for (int i = 0; i < _args.nOptions; i++) {
3118 os::free(_args.options[i].optionString);
3119 }
3120 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3121 }
3122
3123 // Insert options into this option list, to replace option at
3124 // vm_options_file_pos (-XX:VMOptionsFile)
3125 jint insert(const JavaVMInitArgs* args,
3126 const JavaVMInitArgs* args_to_insert,
3127 const int vm_options_file_pos) {
3128 assert(_args.options == nullptr, "shouldn't be set yet");
3129 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3130 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3131
3132 int length = args->nOptions + args_to_insert->nOptions - 1;
3133 // Construct new option array
3134 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3135 for (int i = 0; i < args->nOptions; i++) {
3136 if (i == vm_options_file_pos) {
3137 // insert the new options starting at the same place as the
3138 // -XX:VMOptionsFile option
3139 for (int j = 0; j < args_to_insert->nOptions; j++) {
3140 options.push(args_to_insert->options[j]);
3141 }
3142 } else {
3143 options.push(args->options[i]);
3144 }
3145 }
3146 // make into options array
3147 return set_args(&options);
3148 }
3149 };
3150
3151 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3152 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3153 }
3154
3155 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3156 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3157 }
3158
3159 jint Arguments::parse_options_environment_variable(const char* name,
3160 ScopedVMInitArgs* vm_args) {
3161 char *buffer = ::getenv(name);
3162
3163 // Don't check this environment variable if user has special privileges
3164 // (e.g. unix su command).
3165 if (buffer == nullptr || os::have_special_privileges()) {
3166 return JNI_OK;
3167 }
3168
3169 if ((buffer = os::strdup(buffer)) == nullptr) {
3170 return JNI_ENOMEM;
3171 }
3172
3173 jio_fprintf(defaultStream::error_stream(),
3174 "Picked up %s: %s\n", name, buffer);
3175
3176 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3177
3178 os::free(buffer);
3179 return retcode;
3180 }
3181
3182 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3183 // read file into buffer
3184 int fd = ::open(file_name, O_RDONLY);
3185 if (fd < 0) {
3186 jio_fprintf(defaultStream::error_stream(),
3187 "Could not open options file '%s'\n",
3188 file_name);
3189 return JNI_ERR;
3190 }
3191
3192 struct stat stbuf;
3193 int retcode = os::stat(file_name, &stbuf);
3194 if (retcode != 0) {
3195 jio_fprintf(defaultStream::error_stream(),
3196 "Could not stat options file '%s'\n",
3197 file_name);
3198 ::close(fd);
3199 return JNI_ERR;
3200 }
3201
3202 if (stbuf.st_size == 0) {
3203 // tell caller there is no option data and that is ok
3204 ::close(fd);
3205 return JNI_OK;
3206 }
3207
3208 // '+ 1' for null termination even with max bytes
3209 size_t bytes_alloc = stbuf.st_size + 1;
3210
3211 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3212 if (nullptr == buf) {
3213 jio_fprintf(defaultStream::error_stream(),
3214 "Could not allocate read buffer for options file parse\n");
3215 ::close(fd);
3216 return JNI_ENOMEM;
3217 }
3218
3219 memset(buf, 0, bytes_alloc);
3220
3221 // Fill buffer
3222 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3223 ::close(fd);
3224 if (bytes_read < 0) {
3225 FREE_C_HEAP_ARRAY(char, buf);
3226 jio_fprintf(defaultStream::error_stream(),
3227 "Could not read options file '%s'\n", file_name);
3228 return JNI_ERR;
3229 }
3230
3231 if (bytes_read == 0) {
3232 // tell caller there is no option data and that is ok
3233 FREE_C_HEAP_ARRAY(char, buf);
3234 return JNI_OK;
3235 }
3236
3237 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3238
3239 FREE_C_HEAP_ARRAY(char, buf);
3240 return retcode;
3241 }
3242
3243 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3244 // Construct option array
3245 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3246
3247 // some pointers to help with parsing
3248 char *buffer_end = buffer + buf_len;
3249 char *opt_hd = buffer;
3250 char *wrt = buffer;
3251 char *rd = buffer;
3252
3253 // parse all options
3254 while (rd < buffer_end) {
3255 // skip leading white space from the input string
3256 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3257 rd++;
3258 }
3259
3260 if (rd >= buffer_end) {
3261 break;
3262 }
3263
3264 // Remember this is where we found the head of the token.
3265 opt_hd = wrt;
3266
3267 // Tokens are strings of non white space characters separated
3268 // by one or more white spaces.
3269 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3270 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3271 int quote = *rd; // matching quote to look for
3272 rd++; // don't copy open quote
3273 while (rd < buffer_end && *rd != quote) {
3274 // include everything (even spaces)
3275 // up until the close quote
3276 *wrt++ = *rd++; // copy to option string
3277 }
3278
3279 if (rd < buffer_end) {
3280 rd++; // don't copy close quote
3281 } else {
3282 // did not see closing quote
3283 jio_fprintf(defaultStream::error_stream(),
3284 "Unmatched quote in %s\n", name);
3285 return JNI_ERR;
3286 }
3287 } else {
3288 *wrt++ = *rd++; // copy to option string
3289 }
3290 }
3291
3292 // steal a white space character and set it to null
3293 *wrt++ = '\0';
3294 // We now have a complete token
3295
3296 JavaVMOption option;
3297 option.optionString = opt_hd;
3298 option.extraInfo = nullptr;
3299
3300 options.append(option); // Fill in option
3301
3302 rd++; // Advance to next character
3303 }
3304
3305 // Fill out JavaVMInitArgs structure.
3306 return vm_args->set_args(&options);
3307 }
3308
3309 #ifndef PRODUCT
3310 // Determine whether LogVMOutput should be implicitly turned on.
3311 static bool use_vm_log() {
3312 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3313 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3314 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3315 PrintAssembly || TraceDeoptimization ||
3316 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3317 return true;
3318 }
3319
3320 #ifdef COMPILER1
3321 if (PrintC1Statistics) {
3322 return true;
3323 }
3324 #endif // COMPILER1
3325
3326 #ifdef COMPILER2
3327 if (PrintOptoAssembly || PrintOptoStatistics) {
3328 return true;
3329 }
3330 #endif // COMPILER2
3331
3332 return false;
3333 }
3334
3335 #endif // PRODUCT
3336
3337 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3338 for (int index = 0; index < args->nOptions; index++) {
3339 const JavaVMOption* option = args->options + index;
3340 const char* tail;
3341 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3342 return true;
3343 }
3344 }
3345 return false;
3346 }
3347
3348 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3349 const char* vm_options_file,
3350 const int vm_options_file_pos,
3351 ScopedVMInitArgs* vm_options_file_args,
3352 ScopedVMInitArgs* args_out) {
3353 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3354 if (code != JNI_OK) {
3355 return code;
3356 }
3357
3358 if (vm_options_file_args->get()->nOptions < 1) {
3359 return JNI_OK;
3360 }
3361
3362 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3363 jio_fprintf(defaultStream::error_stream(),
3364 "A VM options file may not refer to a VM options file. "
3365 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3366 "options file '%s' in options container '%s' is an error.\n",
3367 vm_options_file_args->vm_options_file_arg(),
3368 vm_options_file_args->container_name());
3369 return JNI_EINVAL;
3370 }
3371
3372 return args_out->insert(args, vm_options_file_args->get(),
3373 vm_options_file_pos);
3374 }
3375
3376 // Expand -XX:VMOptionsFile found in args_in as needed.
3377 // mod_args and args_out parameters may return values as needed.
3378 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3379 ScopedVMInitArgs* mod_args,
3380 JavaVMInitArgs** args_out) {
3381 jint code = match_special_option_and_act(args_in, mod_args);
3382 if (code != JNI_OK) {
3383 return code;
3384 }
3385
3386 if (mod_args->is_set()) {
3387 // args_in contains -XX:VMOptionsFile and mod_args contains the
3388 // original options from args_in along with the options expanded
3389 // from the VMOptionsFile. Return a short-hand to the caller.
3390 *args_out = mod_args->get();
3391 } else {
3392 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3393 }
3394 return JNI_OK;
3395 }
3396
3397 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3398 ScopedVMInitArgs* args_out) {
3399 // Remaining part of option string
3400 const char* tail;
3401 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3402
3403 for (int index = 0; index < args->nOptions; index++) {
3404 const JavaVMOption* option = args->options + index;
3405 if (match_option(option, "-XX:Flags=", &tail)) {
3406 Arguments::set_jvm_flags_file(tail);
3407 continue;
3408 }
3409 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3410 if (vm_options_file_args.found_vm_options_file_arg()) {
3411 jio_fprintf(defaultStream::error_stream(),
3412 "The option '%s' is already specified in the options "
3413 "container '%s' so the specification of '%s' in the "
3414 "same options container is an error.\n",
3415 vm_options_file_args.vm_options_file_arg(),
3416 vm_options_file_args.container_name(),
3417 option->optionString);
3418 return JNI_EINVAL;
3419 }
3420 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3421 // If there's a VMOptionsFile, parse that
3422 jint code = insert_vm_options_file(args, tail, index,
3423 &vm_options_file_args, args_out);
3424 if (code != JNI_OK) {
3425 return code;
3426 }
3427 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3428 if (args_out->is_set()) {
3429 // The VMOptions file inserted some options so switch 'args'
3430 // to the new set of options, and continue processing which
3431 // preserves "last option wins" semantics.
3432 args = args_out->get();
3433 // The first option from the VMOptionsFile replaces the
3434 // current option. So we back track to process the
3435 // replacement option.
3436 index--;
3437 }
3438 continue;
3439 }
3440 if (match_option(option, "-XX:+PrintVMOptions")) {
3441 PrintVMOptions = true;
3442 continue;
3443 }
3444 if (match_option(option, "-XX:-PrintVMOptions")) {
3445 PrintVMOptions = false;
3446 continue;
3447 }
3448 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3449 IgnoreUnrecognizedVMOptions = true;
3450 continue;
3451 }
3452 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3453 IgnoreUnrecognizedVMOptions = false;
3454 continue;
3455 }
3456 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3457 JVMFlag::printFlags(tty, false);
3458 vm_exit(0);
3459 }
3460
3461 #ifndef PRODUCT
3462 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3463 JVMFlag::printFlags(tty, true);
3464 vm_exit(0);
3465 }
3466 #endif
3467 }
3468 return JNI_OK;
3469 }
3470
3471 static void print_options(const JavaVMInitArgs *args) {
3472 const char* tail;
3473 for (int index = 0; index < args->nOptions; index++) {
3474 const JavaVMOption *option = args->options + index;
3475 if (match_option(option, "-XX:", &tail)) {
3476 logOption(tail);
3477 }
3478 }
3479 }
3480
3481 bool Arguments::handle_deprecated_print_gc_flags() {
3482 if (PrintGC) {
3483 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3484 }
3485 if (PrintGCDetails) {
3486 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3487 }
3488
3489 if (_legacyGCLogging.lastFlag == 2) {
3490 // -Xloggc was used to specify a filename
3491 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3492
3493 LogTarget(Error, logging) target;
3494 LogStream errstream(target);
3495 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3496 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3497 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3498 }
3499 return true;
3500 }
3501
3502 static void apply_debugger_ergo() {
3503 #ifdef ASSERT
3504 if (ReplayCompiles) {
3505 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3506 }
3507
3508 if (UseDebuggerErgo) {
3509 // Turn on sub-flags
3510 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3511 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3512 }
3513
3514 if (UseDebuggerErgo2) {
3515 // Debugging with limited number of CPUs
3516 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3517 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3518 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3519 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3520 }
3521 #endif // ASSERT
3522 }
3523
3524 // Parse entry point called from JNI_CreateJavaVM
3525
3526 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3527 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3528 JVMFlag::check_all_flag_declarations();
3529
3530 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3531 const char* hotspotrc = ".hotspotrc";
3532 bool settings_file_specified = false;
3533 bool needs_hotspotrc_warning = false;
3534 ScopedVMInitArgs initial_vm_options_args("");
3535 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3536 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3537
3538 // Pointers to current working set of containers
3539 JavaVMInitArgs* cur_cmd_args;
3540 JavaVMInitArgs* cur_vm_options_args;
3541 JavaVMInitArgs* cur_java_options_args;
3542 JavaVMInitArgs* cur_java_tool_options_args;
3543
3544 // Containers for modified/expanded options
3545 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3546 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3547 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3548 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3549
3550
3551 jint code =
3552 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3553 if (code != JNI_OK) {
3554 return code;
3555 }
3556
3557 code = parse_java_options_environment_variable(&initial_java_options_args);
3558 if (code != JNI_OK) {
3559 return code;
3560 }
3561
3562 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3563 char *vmoptions = ClassLoader::lookup_vm_options();
3564 if (vmoptions != nullptr) {
3565 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3566 FREE_C_HEAP_ARRAY(char, vmoptions);
3567 if (code != JNI_OK) {
3568 return code;
3569 }
3570 }
3571
3572 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3573 &mod_java_tool_options_args,
3574 &cur_java_tool_options_args);
3575 if (code != JNI_OK) {
3576 return code;
3577 }
3578
3579 code = expand_vm_options_as_needed(initial_cmd_args,
3580 &mod_cmd_args,
3581 &cur_cmd_args);
3582 if (code != JNI_OK) {
3583 return code;
3584 }
3585
3586 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3587 &mod_java_options_args,
3588 &cur_java_options_args);
3589 if (code != JNI_OK) {
3590 return code;
3591 }
3592
3593 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3594 &mod_vm_options_args,
3595 &cur_vm_options_args);
3596 if (code != JNI_OK) {
3597 return code;
3598 }
3599
3600 const char* flags_file = Arguments::get_jvm_flags_file();
3601 settings_file_specified = (flags_file != nullptr);
3602
3603 if (IgnoreUnrecognizedVMOptions) {
3604 cur_cmd_args->ignoreUnrecognized = true;
3605 cur_java_tool_options_args->ignoreUnrecognized = true;
3606 cur_java_options_args->ignoreUnrecognized = true;
3607 }
3608
3609 // Parse specified settings file
3610 if (settings_file_specified) {
3611 if (!process_settings_file(flags_file, true,
3612 cur_cmd_args->ignoreUnrecognized)) {
3613 return JNI_EINVAL;
3614 }
3615 } else {
3616 #ifdef ASSERT
3617 // Parse default .hotspotrc settings file
3618 if (!process_settings_file(".hotspotrc", false,
3619 cur_cmd_args->ignoreUnrecognized)) {
3620 return JNI_EINVAL;
3621 }
3622 #else
3623 struct stat buf;
3624 if (os::stat(hotspotrc, &buf) == 0) {
3625 needs_hotspotrc_warning = true;
3626 }
3627 #endif
3628 }
3629
3630 if (PrintVMOptions) {
3631 print_options(cur_java_tool_options_args);
3632 print_options(cur_cmd_args);
3633 print_options(cur_java_options_args);
3634 }
3635
3636 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3637 jint result = parse_vm_init_args(cur_vm_options_args,
3638 cur_java_tool_options_args,
3639 cur_java_options_args,
3640 cur_cmd_args);
3641
3642 if (result != JNI_OK) {
3643 return result;
3644 }
3645
3646 // Delay warning until here so that we've had a chance to process
3647 // the -XX:-PrintWarnings flag
3648 if (needs_hotspotrc_warning) {
3649 warning("%s file is present but has been ignored. "
3650 "Run with -XX:Flags=%s to load the file.",
3651 hotspotrc, hotspotrc);
3652 }
3653
3654 if (needs_module_property_warning) {
3655 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3656 " names that are reserved for internal use.");
3657 }
3658
3659 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3660 UNSUPPORTED_OPTION(UseLargePages);
3661 #endif
3662
3663 #if defined(AIX)
3664 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3665 #endif
3666
3667 #ifndef PRODUCT
3668 if (TraceBytecodesAt != 0) {
3669 TraceBytecodes = true;
3670 }
3671 #endif // PRODUCT
3672
3673 if (ScavengeRootsInCode == 0) {
3674 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3675 warning("Forcing ScavengeRootsInCode non-zero");
3676 }
3677 ScavengeRootsInCode = 1;
3678 }
3679
3680 if (!handle_deprecated_print_gc_flags()) {
3681 return JNI_EINVAL;
3682 }
3683
3684 // Set object alignment values.
3685 set_object_alignment();
3686
3687 #if !INCLUDE_CDS
3688 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3689 jio_fprintf(defaultStream::error_stream(),
3690 "Shared spaces are not supported in this VM\n");
3691 return JNI_ERR;
3692 }
3693 if (DumpLoadedClassList != nullptr) {
3694 jio_fprintf(defaultStream::error_stream(),
3695 "DumpLoadedClassList is not supported in this VM\n");
3696 return JNI_ERR;
3697 }
3698 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3699 log_is_enabled(Info, cds)) {
3700 warning("Shared spaces are not supported in this VM");
3701 UseSharedSpaces = false;
3702 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3703 }
3704 no_shared_spaces("CDS Disabled");
3705 #endif // INCLUDE_CDS
3706
3707 // Verify NMT arguments
3708 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3709 if (lvl == NMT_unknown) {
3710 jio_fprintf(defaultStream::error_stream(),
3711 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3712 return JNI_ERR;
3713 }
3714 if (PrintNMTStatistics && lvl == NMT_off) {
3715 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3716 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3717 }
3718
3719 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3720 if (trace_dependencies && VerifyDependencies) {
3721 warning("dependency logging results may be inflated by VerifyDependencies");
3722 }
3723
3724 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3725 log_is_enabled(Info, class, load, cause);
3726 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3727 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3728 }
3729
3730 apply_debugger_ergo();
3731
3732 // The VMThread needs to stop now and then to execute these debug options.
3733 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3734 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3735 }
3736
3737 if (log_is_enabled(Info, arguments)) {
3738 LogStream st(Log(arguments)::info());
3739 Arguments::print_on(&st);
3740 }
3741
3742 return JNI_OK;
3743 }
3744
3745 void Arguments::set_compact_headers_flags() {
3746 #ifdef _LP64
3747 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3748 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3749 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3750 }
3751 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3752 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3753 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3754 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3755
3756 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3757 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3758 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3759 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3760 } else {
3761 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3762 }
3763 }
3764 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
3765 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3766 }
3767 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3768 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3769 }
3770 #endif
3771 }
3772
3773 jint Arguments::apply_ergo() {
3774 // Set flags based on ergonomics.
3775 jint result = set_ergonomics_flags();
3776 if (result != JNI_OK) return result;
3777
3778 // Set heap size based on available physical memory
3779 set_heap_size();
3780
3781 GCConfig::arguments()->initialize();
3782
3783 set_compact_headers_flags();
3784
3785 if (UseCompressedClassPointers) {
3786 CompressedKlassPointers::pre_initialize();
3787 }
3788
3789 CDSConfig::ergo_initialize();
3790
3791 // Initialize Metaspace flags and alignments
3792 Metaspace::ergo_initialize();
3793
3794 if (!StringDedup::ergo_initialize()) {
3795 return JNI_EINVAL;
3796 }
3797
3798 // Set compiler flags after GC is selected and GC specific
3799 // flags (LoopStripMiningIter) are set.
3800 CompilerConfig::ergo_initialize();
3801
3802 // Set bytecode rewriting flags
3803 set_bytecode_flags();
3804
3805 // Set flags if aggressive optimization flags are enabled
3806 jint code = set_aggressive_opts_flags();
3807 if (code != JNI_OK) {
3808 return code;
3809 }
3810
3811 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3812 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3813 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3814 warning("UseSecondarySupersTable is not supported");
3815 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3816 }
3817 if (!UseSecondarySupersTable) {
3818 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3819 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3820 }
3821
3822 #ifdef ZERO
3823 // Clear flags not supported on zero.
3824 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3825 #endif // ZERO
3826
3827 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3828 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3829 DebugNonSafepoints = true;
3830 }
3831
3832 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3833 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3834 }
3835
3836 // Treat the odd case where local verification is enabled but remote
3837 // verification is not as if both were enabled.
3838 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3839 log_info(verification)("Turning on remote verification because local verification is on");
3840 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3841 }
3842 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3843 // Disable calling convention optimizations if inline types are not supported.
3844 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3845 // the CDS archive, as the values must match between dumptime and runtime.
3846 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3847 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3848 }
3849 if (!UseNonAtomicValueFlattening && !UseNullableValueFlattening && !UseAtomicValueFlattening) {
3850 // Flattening is disabled
3851 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3852 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3853 }
3854
3855 #ifndef PRODUCT
3856 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3857 if (use_vm_log()) {
3858 LogVMOutput = true;
3859 }
3860 }
3861 #endif // PRODUCT
3862
3863 if (PrintCommandLineFlags) {
3864 JVMFlag::printSetFlags(tty);
3865 }
3866
3867 #if COMPILER2_OR_JVMCI
3868 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3869 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3870 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3871 }
3872 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3873
3874 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3875 if (!EnableVectorReboxing) {
3876 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3877 } else {
3878 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3879 }
3880 }
3881 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3882
3883 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3884 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3885 }
3886 FLAG_SET_DEFAULT(UseVectorStubs, false);
3887 }
3888 #endif // COMPILER2_OR_JVMCI
3889
3890 #ifdef COMPILER2
3891 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3892 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3893 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3894 }
3895 #endif // COMPILER2
3896
3897 if (log_is_enabled(Info, perf, class, link)) {
3898 if (!UsePerfData) {
3899 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3900 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3901 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3902 }
3903 }
3904
3905 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3906 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3907 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3908 }
3909 }
3910 return JNI_OK;
3911 }
3912
3913 jint Arguments::adjust_after_os() {
3914 if (UseNUMA) {
3915 if (UseParallelGC) {
3916 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3917 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3918 }
3919 }
3920 }
3921 return JNI_OK;
3922 }
3923
3924 int Arguments::PropertyList_count(SystemProperty* pl) {
3925 int count = 0;
3926 while(pl != nullptr) {
3927 count++;
3928 pl = pl->next();
3929 }
3930 return count;
3931 }
3932
3933 // Return the number of readable properties.
3934 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3935 int count = 0;
3936 while(pl != nullptr) {
3937 if (pl->readable()) {
3938 count++;
3939 }
3940 pl = pl->next();
3941 }
3942 return count;
3943 }
3944
3945 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3946 assert(key != nullptr, "just checking");
3947 SystemProperty* prop;
3948 for (prop = pl; prop != nullptr; prop = prop->next()) {
3949 if (strcmp(key, prop->key()) == 0) return prop->value();
3950 }
3951 return nullptr;
3952 }
3953
3954 // Return the value of the requested property provided that it is a readable property.
3955 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3956 assert(key != nullptr, "just checking");
3957 SystemProperty* prop;
3958 // Return the property value if the keys match and the property is not internal or
3959 // it's the special internal property "jdk.boot.class.path.append".
3960 for (prop = pl; prop != nullptr; prop = prop->next()) {
3961 if (strcmp(key, prop->key()) == 0) {
3962 if (!prop->internal()) {
3963 return prop->value();
3964 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3965 return prop->value();
3966 } else {
3967 // Property is internal and not jdk.boot.class.path.append so return null.
3968 return nullptr;
3969 }
3970 }
3971 }
3972 return nullptr;
3973 }
3974
3975 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3976 SystemProperty* p = *plist;
3977 if (p == nullptr) {
3978 *plist = new_p;
3979 } else {
3980 while (p->next() != nullptr) {
3981 p = p->next();
3982 }
3983 p->set_next(new_p);
3984 }
3985 }
3986
3987 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3988 bool writeable, bool internal) {
3989 if (plist == nullptr)
3990 return;
3991
3992 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3993 PropertyList_add(plist, new_p);
3994 }
3995
3996 void Arguments::PropertyList_add(SystemProperty *element) {
3997 PropertyList_add(&_system_properties, element);
3998 }
3999
4000 // This add maintains unique property key in the list.
4001 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4002 PropertyAppendable append, PropertyWriteable writeable,
4003 PropertyInternal internal) {
4004 if (plist == nullptr)
4005 return;
4006
4007 // If property key exists and is writeable, then update with new value.
4008 // Trying to update a non-writeable property is silently ignored.
4009 SystemProperty* prop;
4010 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4011 if (strcmp(k, prop->key()) == 0) {
4012 if (append == AppendProperty) {
4013 prop->append_writeable_value(v);
4014 } else {
4015 prop->set_writeable_value(v);
4016 }
4017 return;
4018 }
4019 }
4020
4021 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4022 }
4023
4024 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4025 // Returns true if all of the source pointed by src has been copied over to
4026 // the destination buffer pointed by buf. Otherwise, returns false.
4027 // Notes:
4028 // 1. If the length (buflen) of the destination buffer excluding the
4029 // null terminator character is not long enough for holding the expanded
4030 // pid characters, it also returns false instead of returning the partially
4031 // expanded one.
4032 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4033 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4034 char* buf, size_t buflen) {
4035 const char* p = src;
4036 char* b = buf;
4037 const char* src_end = &src[srclen];
4038 char* buf_end = &buf[buflen - 1];
4039
4040 while (p < src_end && b < buf_end) {
4041 if (*p == '%') {
4042 switch (*(++p)) {
4043 case '%': // "%%" ==> "%"
4044 *b++ = *p++;
4045 break;
4046 case 'p': { // "%p" ==> current process id
4047 // buf_end points to the character before the last character so
4048 // that we could write '\0' to the end of the buffer.
4049 size_t buf_sz = buf_end - b + 1;
4050 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4051
4052 // if jio_snprintf fails or the buffer is not long enough to hold
4053 // the expanded pid, returns false.
4054 if (ret < 0 || ret >= (int)buf_sz) {
4055 return false;
4056 } else {
4057 b += ret;
4058 assert(*b == '\0', "fail in copy_expand_pid");
4059 if (p == src_end && b == buf_end + 1) {
4060 // reach the end of the buffer.
4061 return true;
4062 }
4063 }
4064 p++;
4065 break;
4066 }
4067 default :
4068 *b++ = '%';
4069 }
4070 } else {
4071 *b++ = *p++;
4072 }
4073 }
4074 *b = '\0';
4075 return (p == src_end); // return false if not all of the source was copied
4076 }