1 /*
2 * Copyright (c) 1997, 2024, 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 "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "compiler/compilerDefinitions.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.hpp"
37 #include "gc/shared/genArguments.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
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 char* Arguments::_java_command = nullptr;
89 SystemProperty* Arguments::_system_properties = nullptr;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 const char* Arguments::_java_vendor_url_bug = nullptr;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
102
103 bool Arguments::_enable_preview = false;
104
105 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
106
107 // These are not set by the JDK's built-in launchers, but they can be set by
108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
109 // JavaVMOption in jni.h.
110 abort_hook_t Arguments::_abort_hook = nullptr;
111 exit_hook_t Arguments::_exit_hook = nullptr;
112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
116 SystemProperty *Arguments::_java_library_path = nullptr;
117 SystemProperty *Arguments::_java_home = nullptr;
118 SystemProperty *Arguments::_java_class_path = nullptr;
119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
120 SystemProperty *Arguments::_vm_info = nullptr;
121
122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
123 PathString *Arguments::_boot_class_path = nullptr;
124 bool Arguments::_has_jimage = false;
125
126 char* Arguments::_ext_dirs = nullptr;
127
128 // True if -Xshare:auto option was specified.
129 static bool xshare_auto_cmd_line = false;
130
131 // True if -Xint/-Xmixed/-Xcomp were specified
132 static bool mode_flag_cmd_line = false;
133
134 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
135 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
136 if (new_value == nullptr) {
137 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
138 return false;
139 }
140 if (_value != nullptr) {
141 FreeHeap(_value);
142 }
143 _value = new_value;
144 strcpy(_value, value);
145 return true;
146 }
147
148 void PathString::append_value(const char *value) {
149 char *sp;
150 size_t len = 0;
151 if (value != nullptr) {
152 len = strlen(value);
153 if (_value != nullptr) {
154 len += strlen(_value);
155 }
156 sp = AllocateHeap(len+2, mtArguments);
157 assert(sp != nullptr, "Unable to allocate space for new append path value");
158 if (sp != nullptr) {
159 if (_value != nullptr) {
160 strcpy(sp, _value);
161 strcat(sp, os::path_separator());
162 strcat(sp, value);
163 FreeHeap(_value);
164 } else {
165 strcpy(sp, value);
166 }
167 _value = sp;
168 }
169 }
170 }
171
172 PathString::PathString(const char* value) {
173 if (value == nullptr) {
174 _value = nullptr;
175 } else {
176 _value = AllocateHeap(strlen(value)+1, mtArguments);
177 strcpy(_value, value);
178 }
179 }
180
181 PathString::~PathString() {
182 if (_value != nullptr) {
183 FreeHeap(_value);
184 _value = nullptr;
185 }
186 }
187
188 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
189 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
190 size_t len = strlen(module_name) + 1;
191 _module_name = AllocateHeap(len, mtInternal);
192 strncpy(_module_name, module_name, len); // copy the trailing null
193 _path = new PathString(path);
194 }
195
196 ModulePatchPath::~ModulePatchPath() {
197 if (_module_name != nullptr) {
198 FreeHeap(_module_name);
199 _module_name = nullptr;
200 }
201 if (_path != nullptr) {
202 delete _path;
203 _path = nullptr;
204 }
205 }
206
207 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
208 if (key == nullptr) {
209 _key = nullptr;
210 } else {
211 _key = AllocateHeap(strlen(key)+1, mtArguments);
212 strcpy(_key, key);
213 }
214 _next = nullptr;
215 _internal = internal;
216 _writeable = writeable;
217 }
218
219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
220 // part of the option string.
221 static bool match_option(const JavaVMOption *option, const char* name,
222 const char** tail) {
223 size_t len = strlen(name);
224 if (strncmp(option->optionString, name, len) == 0) {
225 *tail = option->optionString + len;
226 return true;
227 } else {
228 return false;
229 }
230 }
231
232 // Check if 'option' matches 'name'. No "tail" is allowed.
233 static bool match_option(const JavaVMOption *option, const char* name) {
234 const char* tail = nullptr;
235 bool result = match_option(option, name, &tail);
236 if (tail != nullptr && *tail == '\0') {
237 return result;
238 } else {
239 return false;
240 }
241 }
242
243 // Return true if any of the strings in null-terminated array 'names' matches.
244 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
245 // the option must match exactly.
246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
247 bool tail_allowed) {
248 for (/* empty */; *names != nullptr; ++names) {
249 if (match_option(option, *names, tail)) {
250 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
251 return true;
252 }
253 }
254 }
255 return false;
256 }
257
258 #if INCLUDE_JFR
259 static bool _has_jfr_option = false; // is using JFR
260
261 // return true on failure
262 static bool match_jfr_option(const JavaVMOption** option) {
263 assert((*option)->optionString != nullptr, "invariant");
264 char* tail = nullptr;
265 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
266 _has_jfr_option = true;
267 return Jfr::on_start_flight_recording_option(option, tail);
268 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_flight_recorder_option(option, tail);
271 }
272 return false;
273 }
274
275 bool Arguments::has_jfr_option() {
276 return _has_jfr_option;
277 }
278 #endif
279
280 static void logOption(const char* opt) {
281 if (PrintVMOptions) {
282 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
283 }
284 }
285
286 bool needs_module_property_warning = false;
287
288 #define MODULE_PROPERTY_PREFIX "jdk.module."
289 #define MODULE_PROPERTY_PREFIX_LEN 11
290 #define ADDEXPORTS "addexports"
291 #define ADDEXPORTS_LEN 10
292 #define ADDREADS "addreads"
293 #define ADDREADS_LEN 8
294 #define ADDOPENS "addopens"
295 #define ADDOPENS_LEN 8
296 #define PATCH "patch"
297 #define PATCH_LEN 5
298 #define ADDMODS "addmods"
299 #define ADDMODS_LEN 7
300 #define LIMITMODS "limitmods"
301 #define LIMITMODS_LEN 9
302 #define PATH "path"
303 #define PATH_LEN 4
304 #define UPGRADE_PATH "upgrade.path"
305 #define UPGRADE_PATH_LEN 12
306 #define ENABLE_NATIVE_ACCESS "enable.native.access"
307 #define ENABLE_NATIVE_ACCESS_LEN 20
308
309 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
310 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
311 return ((strncmp(option, property, len) == 0) &&
312 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
313 }
314
315 // Return true if property starts with "jdk.module." and its ensuing chars match
316 // any of the reserved module properties.
317 // property should be passed without the leading "-D".
318 bool Arguments::is_internal_module_property(const char* property) {
319 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
320 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
321 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
322 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
323 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
324 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
325 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
326 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
327 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
328 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
329 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
330 return true;
331 }
332 }
333 return false;
334 }
335
336 // Process java launcher properties.
337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
338 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
339 // Must do this before setting up other system properties,
340 // as some of them may depend on launcher type.
341 for (int index = 0; index < args->nOptions; index++) {
342 const JavaVMOption* option = args->options + index;
343 const char* tail;
344
345 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
346 process_java_launcher_argument(tail, option->extraInfo);
347 continue;
348 }
349 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
350 if (strcmp(tail, "true") == 0) {
351 _sun_java_launcher_is_altjvm = true;
352 }
353 continue;
354 }
355 }
356 }
357
358 // Initialize system properties key and value.
359 void Arguments::init_system_properties() {
360
361 // Set up _boot_class_path which is not a property but
362 // relies heavily on argument processing and the jdk.boot.class.path.append
363 // property. It is used to store the underlying boot class path.
364 _boot_class_path = new PathString(nullptr);
365
366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
367 "Java Virtual Machine Specification", false));
368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
370 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
371
372 // Initialize the vm.info now, but it will need updating after argument parsing.
373 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
374
375 // Following are JVMTI agent writable properties.
376 // Properties values are set to nullptr and they are
377 // os specific they are initialized in os::init_system_properties_values().
378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
379 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
380 _java_home = new SystemProperty("java.home", nullptr, true);
381 _java_class_path = new SystemProperty("java.class.path", "", true);
382 // jdk.boot.class.path.append is a non-writeable, internal property.
383 // It can only be set by either:
384 // - -Xbootclasspath/a:
385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
387
388 // Add to System Property list.
389 PropertyList_add(&_system_properties, _sun_boot_library_path);
390 PropertyList_add(&_system_properties, _java_library_path);
391 PropertyList_add(&_system_properties, _java_home);
392 PropertyList_add(&_system_properties, _java_class_path);
393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
394 PropertyList_add(&_system_properties, _vm_info);
395
396 // Set OS specific system properties values
397 os::init_system_properties_values();
398 }
399
400 // Update/Initialize System properties after JDK version number is known
401 void Arguments::init_version_specific_system_properties() {
402 enum { bufsz = 16 };
403 char buffer[bufsz];
404 const char* spec_vendor = "Oracle Corporation";
405 uint32_t spec_version = JDK_Version::current().major_version();
406
407 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
408
409 PropertyList_add(&_system_properties,
410 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
411 PropertyList_add(&_system_properties,
412 new SystemProperty("java.vm.specification.version", buffer, false));
413 PropertyList_add(&_system_properties,
414 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
415 }
416
417 /*
418 * -XX argument processing:
419 *
420 * -XX arguments are defined in several places, such as:
421 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
422 * -XX arguments are parsed in parse_argument().
423 * -XX argument bounds checking is done in check_vm_args_consistency().
424 *
425 * Over time -XX arguments may change. There are mechanisms to handle common cases:
426 *
427 * ALIASED: An option that is simply another name for another option. This is often
428 * part of the process of deprecating a flag, but not all aliases need
429 * to be deprecated.
430 *
431 * Create an alias for an option by adding the old and new option names to the
432 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
433 *
434 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
435 * support may be removed in the future. Both regular and aliased options may be
436 * deprecated.
437 *
438 * Add a deprecation warning for an option (or alias) by adding an entry in the
439 * "special_jvm_flags" table and setting the "deprecated_in" field.
440 * Often an option "deprecated" in one major release will
441 * be made "obsolete" in the next. In this case the entry should also have its
442 * "obsolete_in" field set.
443 *
444 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
445 * on the command line. A warning is printed to let the user know that option might not
446 * be accepted in the future.
447 *
448 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
449 * table and setting the "obsolete_in" field.
450 *
451 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
452 * to the current JDK version. The system will flatly refuse to admit the existence of
453 * the flag. This allows a flag to die automatically over JDK releases.
454 *
455 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
456 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
457 * - Newly obsolete or expired deprecated options should have their global variable
458 * definitions removed (from globals.hpp, etc) and related implementations removed.
459 *
460 * Recommended approach for removing options:
461 *
462 * To remove options commonly used by customers (e.g. product -XX options), use
463 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
464 *
465 * To remove internal options (e.g. diagnostic, experimental, develop options), use
466 * a 2-step model adding major release numbers to the obsolete and expire columns.
467 *
468 * To change the name of an option, use the alias table as well as a 2-step
469 * model adding major release numbers to the deprecate and expire columns.
470 * Think twice about aliasing commonly used customer options.
471 *
472 * There are times when it is appropriate to leave a future release number as undefined.
473 *
474 * Tests: Aliases should be tested in VMAliasOptions.java.
475 * Deprecated options should be tested in VMDeprecatedOptions.java.
476 */
477
478 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
479 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
480 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
481 // the command-line as usual, but will issue a warning.
482 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
483 // the command-line, while issuing a warning and ignoring the flag value.
484 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
485 // existence of the flag.
486 //
487 // MANUAL CLEANUP ON JDK VERSION UPDATES:
488 // This table ensures that the handling of options will update automatically when the JDK
489 // version is incremented, but the source code needs to be cleanup up manually:
490 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
491 // variable should be removed, as well as users of the variable.
492 // - As "deprecated" options age into "obsolete" options, move the entry into the
493 // "Obsolete Flags" section of the table.
494 // - All expired options should be removed from the table.
495 static SpecialFlag const special_jvm_flags[] = {
496 // -------------- Deprecated Flags --------------
497 // --- Non-alias flags - sorted by obsolete_in then expired_in:
498 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() },
501 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
502 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
503 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
504 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
505 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
506 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
507 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
508 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
509 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
510 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
511
512 // -------------- Obsolete Flags - sorted by expired_in --------------
513
514 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
515
516 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
517 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
518 #if defined(X86)
519 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
520 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
521 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
522 #endif // X86
523
524 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
525 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
526 #ifdef ASSERT
527 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
528 #endif
529
530 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
531 // These entries will generate build errors. Their purpose is to test the macros.
532 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
533 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
534 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
535 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
536 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
537 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
538 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
539 #endif
540
541 { nullptr, JDK_Version(0), JDK_Version(0) }
542 };
543
544 // Flags that are aliases for other flags.
545 typedef struct {
546 const char* alias_name;
547 const char* real_name;
548 } AliasedFlag;
549
550 static AliasedFlag const aliased_jvm_flags[] = {
551 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
552 { nullptr, nullptr}
553 };
554
555 // Return true if "v" is less than "other", where "other" may be "undefined".
556 static bool version_less_than(JDK_Version v, JDK_Version other) {
557 assert(!v.is_undefined(), "must be defined");
558 if (!other.is_undefined() && v.compare(other) >= 0) {
559 return false;
560 } else {
561 return true;
562 }
563 }
564
565 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
566 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
567 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
568 flag = special_jvm_flags[i];
569 return true;
570 }
571 }
572 return false;
573 }
574
575 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
576 assert(version != nullptr, "Must provide a version buffer");
577 SpecialFlag flag;
578 if (lookup_special_flag(flag_name, flag)) {
579 if (!flag.obsolete_in.is_undefined()) {
580 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
581 *version = flag.obsolete_in;
582 // This flag may have been marked for obsoletion in this version, but we may not
583 // have actually removed it yet. Rather than ignoring it as soon as we reach
584 // this version we allow some time for the removal to happen. So if the flag
585 // still actually exists we process it as normal, but issue an adjusted warning.
586 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
587 if (real_flag != nullptr) {
588 char version_str[256];
589 version->to_string(version_str, sizeof(version_str));
590 warning("Temporarily processing option %s; support is scheduled for removal in %s",
591 flag_name, version_str);
592 return false;
593 }
594 return true;
595 }
596 }
597 }
598 return false;
599 }
600
601 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
602 assert(version != nullptr, "Must provide a version buffer");
603 SpecialFlag flag;
604 if (lookup_special_flag(flag_name, flag)) {
605 if (!flag.deprecated_in.is_undefined()) {
606 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
607 version_less_than(JDK_Version::current(), flag.expired_in)) {
608 *version = flag.deprecated_in;
609 return 1;
610 } else {
611 return -1;
612 }
613 }
614 }
615 return 0;
616 }
617
618 const char* Arguments::real_flag_name(const char *flag_name) {
619 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
620 const AliasedFlag& flag_status = aliased_jvm_flags[i];
621 if (strcmp(flag_status.alias_name, flag_name) == 0) {
622 return flag_status.real_name;
623 }
624 }
625 return flag_name;
626 }
627
628 #ifdef ASSERT
629 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
630 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
631 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
632 return true;
633 }
634 }
635 return false;
636 }
637
638 // Verifies the correctness of the entries in the special_jvm_flags table.
639 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
640 // version being earlier than the deprecation version, then a warning is issued
641 // and verification fails - by returning false. If it is detected that the table
642 // is out of date, with respect to the current version, then ideally a warning is
643 // issued but verification does not fail. This allows the VM to operate when the
644 // version is first updated, without needing to update all the impacted flags at
645 // the same time. In practice we can't issue the warning immediately when the version
646 // is updated as it occurs for every test and some tests are not prepared to handle
647 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
648 // if the check_globals flag is true, and in addition allow a grace period and only
649 // check for stale flags when we hit build 25 (which is far enough into the 6 month
650 // release cycle that all flag updates should have been processed, whilst still
651 // leaving time to make the change before RDP2).
652 // We use a gtest to call this, passing true, so that we can detect stale flags before
653 // the end of the release cycle.
654
655 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
656
657 bool Arguments::verify_special_jvm_flags(bool check_globals) {
658 bool success = true;
659 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
660 const SpecialFlag& flag = special_jvm_flags[i];
661 if (lookup_special_flag(flag.name, i)) {
662 warning("Duplicate special flag declaration \"%s\"", flag.name);
663 success = false;
664 }
665 if (flag.deprecated_in.is_undefined() &&
666 flag.obsolete_in.is_undefined()) {
667 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
668 success = false;
669 }
670
671 if (!flag.deprecated_in.is_undefined()) {
672 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
673 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
674 success = false;
675 }
676
677 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
678 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
679 success = false;
680 }
681 }
682
683 if (!flag.obsolete_in.is_undefined()) {
684 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
685 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
686 success = false;
687 }
688
689 // if flag has become obsolete it should not have a "globals" flag defined anymore.
690 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
691 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
692 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
693 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
694 success = false;
695 }
696 }
697
698 } else if (!flag.expired_in.is_undefined()) {
699 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
700 success = false;
701 }
702
703 if (!flag.expired_in.is_undefined()) {
704 // if flag has become expired it should not have a "globals" flag defined anymore.
705 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
706 !version_less_than(JDK_Version::current(), flag.expired_in)) {
707 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
708 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
709 success = false;
710 }
711 }
712 }
713 }
714 return success;
715 }
716 #endif
717
718 bool Arguments::atojulong(const char *s, julong* result) {
719 return parse_integer(s, result);
720 }
721
722 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
723 if (size < min_size) return arg_too_small;
724 if (size > max_size) return arg_too_big;
725 return arg_in_range;
726 }
727
728 // Describe an argument out of range error
729 void Arguments::describe_range_error(ArgsRange errcode) {
730 switch(errcode) {
731 case arg_too_big:
732 jio_fprintf(defaultStream::error_stream(),
733 "The specified size exceeds the maximum "
734 "representable size.\n");
735 break;
736 case arg_too_small:
737 case arg_unreadable:
738 case arg_in_range:
739 // do nothing for now
740 break;
741 default:
742 ShouldNotReachHere();
743 }
744 }
745
746 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
747 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
748 return true;
749 } else {
750 return false;
751 }
752 }
753
754 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
755 // strtod allows leading whitespace, but our flag format does not.
756 if (*value == '\0' || isspace((unsigned char) *value)) {
757 return false;
758 }
759 char* end;
760 errno = 0;
761 double v = strtod(value, &end);
762 if ((errno != 0) || (*end != 0)) {
763 return false;
764 }
765 if (g_isnan(v) || !g_isfinite(v)) {
766 // Currently we cannot handle these special values.
767 return false;
768 }
769
770 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
771 return true;
772 }
773 return false;
774 }
775
776 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
777 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
778
779 if (flag->is_int()) {
780 int v;
781 if (parse_integer(value, &v)) {
782 result = JVMFlagAccess::set_int(flag, &v, origin);
783 }
784 } else if (flag->is_uint()) {
785 uint v;
786 if (parse_integer(value, &v)) {
787 result = JVMFlagAccess::set_uint(flag, &v, origin);
788 }
789 } else if (flag->is_intx()) {
790 intx v;
791 if (parse_integer(value, &v)) {
792 result = JVMFlagAccess::set_intx(flag, &v, origin);
793 }
794 } else if (flag->is_uintx()) {
795 uintx v;
796 if (parse_integer(value, &v)) {
797 result = JVMFlagAccess::set_uintx(flag, &v, origin);
798 }
799 } else if (flag->is_uint64_t()) {
800 uint64_t v;
801 if (parse_integer(value, &v)) {
802 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
803 }
804 } else if (flag->is_size_t()) {
805 size_t v;
806 if (parse_integer(value, &v)) {
807 result = JVMFlagAccess::set_size_t(flag, &v, origin);
808 }
809 }
810
811 return result == JVMFlag::SUCCESS;
812 }
813
814 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
815 if (value[0] == '\0') {
816 value = nullptr;
817 }
818 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
819 // Contract: JVMFlag always returns a pointer that needs freeing.
820 FREE_C_HEAP_ARRAY(char, value);
821 return true;
822 }
823
824 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
825 const char* old_value = "";
826 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
827 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
828 size_t new_len = strlen(new_value);
829 const char* value;
830 char* free_this_too = nullptr;
831 if (old_len == 0) {
832 value = new_value;
833 } else if (new_len == 0) {
834 value = old_value;
835 } else {
836 size_t length = old_len + 1 + new_len + 1;
837 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
838 // each new setting adds another LINE to the switch:
839 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
840 value = buf;
841 free_this_too = buf;
842 }
843 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
844 // JVMFlag always returns a pointer that needs freeing.
845 FREE_C_HEAP_ARRAY(char, value);
846 // JVMFlag made its own copy, so I must delete my own temp. buffer.
847 FREE_C_HEAP_ARRAY(char, free_this_too);
848 return true;
849 }
850
851 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
852 const char* real_name = real_flag_name(arg);
853 JDK_Version since = JDK_Version();
854 switch (is_deprecated_flag(arg, &since)) {
855 case -1: {
856 // Obsolete or expired, so don't process normally,
857 // but allow for an obsolete flag we're still
858 // temporarily allowing.
859 if (!is_obsolete_flag(arg, &since)) {
860 return real_name;
861 }
862 // Note if we're not considered obsolete then we can't be expired either
863 // as obsoletion must come first.
864 return nullptr;
865 }
866 case 0:
867 return real_name;
868 case 1: {
869 char version[256];
870 since.to_string(version, sizeof(version));
871 if (real_name != arg) {
872 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
873 arg, version, real_name);
874 } else {
875 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
876 arg, version);
877 }
878 return real_name;
879 }
880 }
881 ShouldNotReachHere();
882 return nullptr;
883 }
884
885 #define BUFLEN 255
886
887 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
888 char name_copied[BUFLEN+1];
889 if (name[name_length] != 0) {
890 if (name_length > BUFLEN) {
891 return nullptr;
892 } else {
893 strncpy(name_copied, name, name_length);
894 name_copied[name_length] = '\0';
895 name = name_copied;
896 }
897 }
898
899 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
900 if (real_name == nullptr) {
901 return nullptr;
902 }
903 JVMFlag* flag = JVMFlag::find_flag(real_name);
904 return flag;
905 }
906
907 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
908 bool is_bool = false;
909 bool bool_val = false;
910 char c = *arg;
911 if (c == '+' || c == '-') {
912 is_bool = true;
913 bool_val = (c == '+');
914 arg++;
915 }
916
917 const char* name = arg;
918 while (true) {
919 c = *arg;
920 if (isalnum(c) || (c == '_')) {
921 ++arg;
922 } else {
923 break;
924 }
925 }
926
927 size_t name_len = size_t(arg - name);
928 if (name_len == 0) {
929 return false;
930 }
931
932 JVMFlag* flag = find_jvm_flag(name, name_len);
933 if (flag == nullptr) {
934 return false;
935 }
936
937 if (is_bool) {
938 if (*arg != 0) {
939 // Error -- extra characters such as -XX:+BoolFlag=123
940 return false;
941 }
942 return set_bool_flag(flag, bool_val, origin);
943 }
944
945 if (arg[0] == '=') {
946 const char* value = arg + 1;
947 if (flag->is_ccstr()) {
948 if (flag->ccstr_accumulates()) {
949 return append_to_string_flag(flag, value, origin);
950 } else {
951 return set_string_flag(flag, value, origin);
952 }
953 } else if (flag->is_double()) {
954 return set_fp_numeric_flag(flag, value, origin);
955 } else {
956 return set_numeric_flag(flag, value, origin);
957 }
958 }
959
960 if (arg[0] == ':' && arg[1] == '=') {
961 // -XX:Foo:=xxx will reset the string flag to the given value.
962 const char* value = arg + 2;
963 return set_string_flag(flag, value, origin);
964 }
965
966 return false;
967 }
968
969 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
970 assert(bldarray != nullptr, "illegal argument");
971
972 if (arg == nullptr) {
973 return;
974 }
975
976 int new_count = *count + 1;
977
978 // expand the array and add arg to the last element
979 if (*bldarray == nullptr) {
980 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
981 } else {
982 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
983 }
984 (*bldarray)[*count] = os::strdup_check_oom(arg);
985 *count = new_count;
986 }
987
988 void Arguments::build_jvm_args(const char* arg) {
989 add_string(&_jvm_args_array, &_num_jvm_args, arg);
990 }
991
992 void Arguments::build_jvm_flags(const char* arg) {
993 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
994 }
995
996 // utility function to return a string that concatenates all
997 // strings in a given char** array
998 const char* Arguments::build_resource_string(char** args, int count) {
999 if (args == nullptr || count == 0) {
1000 return nullptr;
1001 }
1002 size_t length = 0;
1003 for (int i = 0; i < count; i++) {
1004 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1005 }
1006 char* s = NEW_RESOURCE_ARRAY(char, length);
1007 char* dst = s;
1008 for (int j = 0; j < count; j++) {
1009 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1010 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1011 dst += offset;
1012 length -= offset;
1013 }
1014 return (const char*) s;
1015 }
1016
1017 void Arguments::print_on(outputStream* st) {
1018 st->print_cr("VM Arguments:");
1019 if (num_jvm_flags() > 0) {
1020 st->print("jvm_flags: "); print_jvm_flags_on(st);
1021 st->cr();
1022 }
1023 if (num_jvm_args() > 0) {
1024 st->print("jvm_args: "); print_jvm_args_on(st);
1025 st->cr();
1026 }
1027 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1028 if (_java_class_path != nullptr) {
1029 char* path = _java_class_path->value();
1030 size_t len = strlen(path);
1031 st->print("java_class_path (initial): ");
1032 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1033 if (len == 0) {
1034 st->print_raw_cr("<not set>");
1035 } else {
1036 st->print_raw_cr(path, len);
1037 }
1038 }
1039 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1040 }
1041
1042 void Arguments::print_summary_on(outputStream* st) {
1043 // Print the command line. Environment variables that are helpful for
1044 // reproducing the problem are written later in the hs_err file.
1045 // flags are from setting file
1046 if (num_jvm_flags() > 0) {
1047 st->print_raw("Settings File: ");
1048 print_jvm_flags_on(st);
1049 st->cr();
1050 }
1051 // args are the command line and environment variable arguments.
1052 st->print_raw("Command Line: ");
1053 if (num_jvm_args() > 0) {
1054 print_jvm_args_on(st);
1055 }
1056 // this is the classfile and any arguments to the java program
1057 if (java_command() != nullptr) {
1058 st->print("%s", java_command());
1059 }
1060 st->cr();
1061 }
1062
1063 void Arguments::print_jvm_flags_on(outputStream* st) {
1064 if (_num_jvm_flags > 0) {
1065 for (int i=0; i < _num_jvm_flags; i++) {
1066 st->print("%s ", _jvm_flags_array[i]);
1067 }
1068 }
1069 }
1070
1071 void Arguments::print_jvm_args_on(outputStream* st) {
1072 if (_num_jvm_args > 0) {
1073 for (int i=0; i < _num_jvm_args; i++) {
1074 st->print("%s ", _jvm_args_array[i]);
1075 }
1076 }
1077 }
1078
1079 bool Arguments::process_argument(const char* arg,
1080 jboolean ignore_unrecognized,
1081 JVMFlagOrigin origin) {
1082 JDK_Version since = JDK_Version();
1083
1084 if (parse_argument(arg, origin)) {
1085 return true;
1086 }
1087
1088 // Determine if the flag has '+', '-', or '=' characters.
1089 bool has_plus_minus = (*arg == '+' || *arg == '-');
1090 const char* const argname = has_plus_minus ? arg + 1 : arg;
1091
1092 size_t arg_len;
1093 const char* equal_sign = strchr(argname, '=');
1094 if (equal_sign == nullptr) {
1095 arg_len = strlen(argname);
1096 } else {
1097 arg_len = equal_sign - argname;
1098 }
1099
1100 // Only make the obsolete check for valid arguments.
1101 if (arg_len <= BUFLEN) {
1102 // Construct a string which consists only of the argument name without '+', '-', or '='.
1103 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1104 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1105 if (is_obsolete_flag(stripped_argname, &since)) {
1106 char version[256];
1107 since.to_string(version, sizeof(version));
1108 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1109 return true;
1110 }
1111 }
1112
1113 // For locked flags, report a custom error message if available.
1114 // Otherwise, report the standard unrecognized VM option.
1115 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1116 if (found_flag != nullptr) {
1117 char locked_message_buf[BUFLEN];
1118 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1119 if (strlen(locked_message_buf) != 0) {
1120 #ifdef PRODUCT
1121 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1122 if (ignore_unrecognized && mismatched) {
1123 return true;
1124 }
1125 #endif
1126 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1127 }
1128 if (found_flag->is_bool() && !has_plus_minus) {
1129 jio_fprintf(defaultStream::error_stream(),
1130 "Missing +/- setting for VM option '%s'\n", argname);
1131 } else if (!found_flag->is_bool() && has_plus_minus) {
1132 jio_fprintf(defaultStream::error_stream(),
1133 "Unexpected +/- setting in VM option '%s'\n", argname);
1134 } else {
1135 jio_fprintf(defaultStream::error_stream(),
1136 "Improperly specified VM option '%s'\n", argname);
1137 }
1138 } else {
1139 if (ignore_unrecognized) {
1140 return true;
1141 }
1142 jio_fprintf(defaultStream::error_stream(),
1143 "Unrecognized VM option '%s'\n", argname);
1144 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1145 if (fuzzy_matched != nullptr) {
1146 jio_fprintf(defaultStream::error_stream(),
1147 "Did you mean '%s%s%s'?\n",
1148 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1149 fuzzy_matched->name(),
1150 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1151 }
1152 }
1153
1154 // allow for commandline "commenting out" options like -XX:#+Verbose
1155 return arg[0] == '#';
1156 }
1157
1158 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1159 FILE* stream = os::fopen(file_name, "rb");
1160 if (stream == nullptr) {
1161 if (should_exist) {
1162 jio_fprintf(defaultStream::error_stream(),
1163 "Could not open settings file %s\n", file_name);
1164 return false;
1165 } else {
1166 return true;
1167 }
1168 }
1169
1170 char token[1024];
1171 int pos = 0;
1172
1173 bool in_white_space = true;
1174 bool in_comment = false;
1175 bool in_quote = false;
1176 int quote_c = 0;
1177 bool result = true;
1178
1179 int c = getc(stream);
1180 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1181 if (in_white_space) {
1182 if (in_comment) {
1183 if (c == '\n') in_comment = false;
1184 } else {
1185 if (c == '#') in_comment = true;
1186 else if (!isspace((unsigned char) c)) {
1187 in_white_space = false;
1188 token[pos++] = checked_cast<char>(c);
1189 }
1190 }
1191 } else {
1192 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1193 // token ends at newline, or at unquoted whitespace
1194 // this allows a way to include spaces in string-valued options
1195 token[pos] = '\0';
1196 logOption(token);
1197 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1198 build_jvm_flags(token);
1199 pos = 0;
1200 in_white_space = true;
1201 in_quote = false;
1202 } else if (!in_quote && (c == '\'' || c == '"')) {
1203 in_quote = true;
1204 quote_c = c;
1205 } else if (in_quote && (c == quote_c)) {
1206 in_quote = false;
1207 } else {
1208 token[pos++] = checked_cast<char>(c);
1209 }
1210 }
1211 c = getc(stream);
1212 }
1213 if (pos > 0) {
1214 token[pos] = '\0';
1215 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1216 build_jvm_flags(token);
1217 }
1218 fclose(stream);
1219 return result;
1220 }
1221
1222 //=============================================================================================================
1223 // Parsing of properties (-D)
1224
1225 const char* Arguments::get_property(const char* key) {
1226 return PropertyList_get_value(system_properties(), key);
1227 }
1228
1229 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1230 const char* eq = strchr(prop, '=');
1231 const char* key;
1232 const char* value = "";
1233
1234 if (eq == nullptr) {
1235 // property doesn't have a value, thus use passed string
1236 key = prop;
1237 } else {
1238 // property have a value, thus extract it and save to the
1239 // allocated string
1240 size_t key_len = eq - prop;
1241 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1242
1243 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1244 key = tmp_key;
1245
1246 value = &prop[key_len + 1];
1247 }
1248
1249 if (internal == ExternalProperty) {
1250 CDSConfig::check_incompatible_property(key, value);
1251 }
1252
1253 if (strcmp(key, "java.compiler") == 0) {
1254 // we no longer support java.compiler system property, log a warning and let it get
1255 // passed to Java, like any other system property
1256 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1257 // for applications using NONE or empty value, log a more informative message
1258 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1259 } else {
1260 warning("The java.compiler system property is obsolete and no longer supported.");
1261 }
1262 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1263 // sun.java.launcher.is_altjvm property is
1264 // private and is processed in process_sun_java_launcher_properties();
1265 // the sun.java.launcher property is passed on to the java application
1266 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1267 // append is true, writable is true, internal is false
1268 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1269 WriteableProperty, ExternalProperty);
1270 } else {
1271 if (strcmp(key, "sun.java.command") == 0) {
1272 char *old_java_command = _java_command;
1273 _java_command = os::strdup_check_oom(value, mtArguments);
1274 if (old_java_command != nullptr) {
1275 os::free(old_java_command);
1276 }
1277 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1278 // If this property is set on the command line then its value will be
1279 // displayed in VM error logs as the URL at which to submit such logs.
1280 // Normally the URL displayed in error logs is different from the value
1281 // of this system property, so a different property should have been
1282 // used here, but we leave this as-is in case someone depends upon it.
1283 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1284 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1285 // its value without going through the property list or making a Java call.
1286 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1287 if (old_java_vendor_url_bug != nullptr) {
1288 os::free((void *)old_java_vendor_url_bug);
1289 }
1290 }
1291
1292 // Create new property and add at the end of the list
1293 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1294 }
1295
1296 if (key != prop) {
1297 // SystemProperty copy passed value, thus free previously allocated
1298 // memory
1299 FreeHeap((void *)key);
1300 }
1301
1302 return true;
1303 }
1304
1305 //===========================================================================================================
1306 // Setting int/mixed/comp mode flags
1307
1308 void Arguments::set_mode_flags(Mode mode) {
1309 // Set up default values for all flags.
1310 // If you add a flag to any of the branches below,
1311 // add a default value for it here.
1312 _mode = mode;
1313
1314 // Ensure Agent_OnLoad has the correct initial values.
1315 // This may not be the final mode; mode may change later in onload phase.
1316 PropertyList_unique_add(&_system_properties, "java.vm.info",
1317 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1318
1319 UseInterpreter = true;
1320 UseCompiler = true;
1321 UseLoopCounter = true;
1322
1323 // Default values may be platform/compiler dependent -
1324 // use the saved values
1325 ClipInlining = Arguments::_ClipInlining;
1326 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1327 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1328 BackgroundCompilation = Arguments::_BackgroundCompilation;
1329
1330 // Change from defaults based on mode
1331 switch (mode) {
1332 default:
1333 ShouldNotReachHere();
1334 break;
1335 case _int:
1336 UseCompiler = false;
1337 UseLoopCounter = false;
1338 AlwaysCompileLoopMethods = false;
1339 UseOnStackReplacement = false;
1340 break;
1341 case _mixed:
1342 // same as default
1343 break;
1344 case _comp:
1345 UseInterpreter = false;
1346 BackgroundCompilation = false;
1347 ClipInlining = false;
1348 break;
1349 }
1350 }
1351
1352 // Conflict: required to use shared spaces (-Xshare:on), but
1353 // incompatible command line options were chosen.
1354 void Arguments::no_shared_spaces(const char* message) {
1355 if (RequireSharedSpaces) {
1356 jio_fprintf(defaultStream::error_stream(),
1357 "Class data sharing is inconsistent with other specified options.\n");
1358 vm_exit_during_initialization("Unable to use shared archive", message);
1359 } else {
1360 log_info(cds)("Unable to use shared archive: %s", message);
1361 UseSharedSpaces = false;
1362 }
1363 }
1364
1365 static void set_object_alignment() {
1366 // Object alignment.
1367 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1368 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1369 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1370 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1371 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1372 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1373
1374 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1375 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1376
1377 // Oop encoding heap max
1378 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1379 }
1380
1381 size_t Arguments::max_heap_for_compressed_oops() {
1382 // Avoid sign flip.
1383 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1384 // We need to fit both the null page and the heap into the memory budget, while
1385 // keeping alignment constraints of the heap. To guarantee the latter, as the
1386 // null page is located before the heap, we pad the null page to the conservative
1387 // maximum alignment that the GC may ever impose upon the heap.
1388 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1389 _conservative_max_heap_alignment);
1390
1391 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1392 NOT_LP64(ShouldNotReachHere(); return 0);
1393 }
1394
1395 void Arguments::set_use_compressed_oops() {
1396 #ifdef _LP64
1397 // MaxHeapSize is not set up properly at this point, but
1398 // the only value that can override MaxHeapSize if we are
1399 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1400 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1401
1402 if (max_heap_size <= max_heap_for_compressed_oops()) {
1403 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1404 FLAG_SET_ERGO(UseCompressedOops, true);
1405 }
1406 } else {
1407 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1408 warning("Max heap size too large for Compressed Oops");
1409 FLAG_SET_DEFAULT(UseCompressedOops, false);
1410 }
1411 }
1412 #endif // _LP64
1413 }
1414
1415 void Arguments::set_use_compressed_klass_ptrs() {
1416 #ifdef _LP64
1417 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1418 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1419 #endif // _LP64
1420 }
1421
1422 void Arguments::set_conservative_max_heap_alignment() {
1423 // The conservative maximum required alignment for the heap is the maximum of
1424 // the alignments imposed by several sources: any requirements from the heap
1425 // itself and the maximum page size we may run the VM with.
1426 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1427 _conservative_max_heap_alignment = MAX4(heap_alignment,
1428 os::vm_allocation_granularity(),
1429 os::max_page_size(),
1430 GCArguments::compute_heap_alignment());
1431 }
1432
1433 jint Arguments::set_ergonomics_flags() {
1434 GCConfig::initialize();
1435
1436 set_conservative_max_heap_alignment();
1437
1438 #ifdef _LP64
1439 set_use_compressed_oops();
1440 set_use_compressed_klass_ptrs();
1441
1442 // Also checks that certain machines are slower with compressed oops
1443 // in vm_version initialization code.
1444 #endif // _LP64
1445
1446 return JNI_OK;
1447 }
1448
1449 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1450 size_t max_allocatable;
1451 size_t result = limit;
1452 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1453 // The AggressiveHeap check is a temporary workaround to avoid calling
1454 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1455 // selected. This works because AggressiveHeap implies UseParallelGC
1456 // where we know the ratio will be 1. Once the AggressiveHeap option is
1457 // removed, this can be cleaned up.
1458 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1459 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1460 result = MIN2(result, max_allocatable / fraction);
1461 }
1462 return result;
1463 }
1464
1465 // Use static initialization to get the default before parsing
1466 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1467
1468 void Arguments::set_heap_size() {
1469 julong phys_mem;
1470
1471 // If the user specified one of these options, they
1472 // want specific memory sizing so do not limit memory
1473 // based on compressed oops addressability.
1474 // Also, memory limits will be calculated based on
1475 // available os physical memory, not our MaxRAM limit,
1476 // unless MaxRAM is also specified.
1477 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1478 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1479 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1480 !FLAG_IS_DEFAULT(MaxRAM));
1481 if (override_coop_limit) {
1482 if (FLAG_IS_DEFAULT(MaxRAM)) {
1483 phys_mem = os::physical_memory();
1484 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1485 } else {
1486 phys_mem = (julong)MaxRAM;
1487 }
1488 } else {
1489 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1490 : (julong)MaxRAM;
1491 }
1492
1493 // If the maximum heap size has not been set with -Xmx,
1494 // then set it as fraction of the size of physical memory,
1495 // respecting the maximum and minimum sizes of the heap.
1496 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1497 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1498 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1499 if (reasonable_min < MaxHeapSize) {
1500 // Small physical memory, so use a minimum fraction of it for the heap
1501 reasonable_max = reasonable_min;
1502 } else {
1503 // Not-small physical memory, so require a heap at least
1504 // as large as MaxHeapSize
1505 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1506 }
1507
1508 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1509 // Limit the heap size to ErgoHeapSizeLimit
1510 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1511 }
1512
1513 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1514
1515 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1516 // An initial heap size was specified on the command line,
1517 // so be sure that the maximum size is consistent. Done
1518 // after call to limit_heap_by_allocatable_memory because that
1519 // method might reduce the allocation size.
1520 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1521 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1522 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1523 }
1524
1525 #ifdef _LP64
1526 if (UseCompressedOops || UseCompressedClassPointers) {
1527 // HeapBaseMinAddress can be greater than default but not less than.
1528 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1529 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1530 // matches compressed oops printing flags
1531 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1532 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1533 DefaultHeapBaseMinAddress,
1534 DefaultHeapBaseMinAddress/G,
1535 HeapBaseMinAddress);
1536 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1537 }
1538 }
1539 }
1540 if (UseCompressedOops) {
1541 // Limit the heap size to the maximum possible when using compressed oops
1542 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1543
1544 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1545 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1546 // but it should be not less than default MaxHeapSize.
1547 max_coop_heap -= HeapBaseMinAddress;
1548 }
1549
1550 // If user specified flags prioritizing os physical
1551 // memory limits, then disable compressed oops if
1552 // limits exceed max_coop_heap and UseCompressedOops
1553 // was not specified.
1554 if (reasonable_max > max_coop_heap) {
1555 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1556 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1557 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1558 "Please check the setting of MaxRAMPercentage %5.2f."
1559 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1560 FLAG_SET_ERGO(UseCompressedOops, false);
1561 } else {
1562 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1563 }
1564 }
1565 }
1566 #endif // _LP64
1567
1568 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1569 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1570 }
1571
1572 // If the minimum or initial heap_size have not been set or requested to be set
1573 // ergonomically, set them accordingly.
1574 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1575 julong reasonable_minimum = (julong)(OldSize + NewSize);
1576
1577 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1578
1579 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1580
1581 if (InitialHeapSize == 0) {
1582 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1583 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1584
1585 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1586 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1587
1588 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1589 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1590 }
1591 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1592 // synchronize with InitialHeapSize to avoid errors with the default value.
1593 if (MinHeapSize == 0) {
1594 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1595 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1596 }
1597 }
1598 }
1599
1600 // This option inspects the machine and attempts to set various
1601 // parameters to be optimal for long-running, memory allocation
1602 // intensive jobs. It is intended for machines with large
1603 // amounts of cpu and memory.
1604 jint Arguments::set_aggressive_heap_flags() {
1605 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1606 // VM, but we may not be able to represent the total physical memory
1607 // available (like having 8gb of memory on a box but using a 32bit VM).
1608 // Thus, we need to make sure we're using a julong for intermediate
1609 // calculations.
1610 julong initHeapSize;
1611 julong total_memory = os::physical_memory();
1612
1613 if (total_memory < (julong) 256 * M) {
1614 jio_fprintf(defaultStream::error_stream(),
1615 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1616 vm_exit(1);
1617 }
1618
1619 // The heap size is half of available memory, or (at most)
1620 // all of possible memory less 160mb (leaving room for the OS
1621 // when using ISM). This is the maximum; because adaptive sizing
1622 // is turned on below, the actual space used may be smaller.
1623
1624 initHeapSize = MIN2(total_memory / (julong) 2,
1625 total_memory - (julong) 160 * M);
1626
1627 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1628
1629 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1630 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1631 return JNI_EINVAL;
1632 }
1633 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1634 return JNI_EINVAL;
1635 }
1636 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1637 return JNI_EINVAL;
1638 }
1639 }
1640 if (FLAG_IS_DEFAULT(NewSize)) {
1641 // Make the young generation 3/8ths of the total heap.
1642 if (FLAG_SET_CMDLINE(NewSize,
1643 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1644 return JNI_EINVAL;
1645 }
1646 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1647 return JNI_EINVAL;
1648 }
1649 }
1650
1651 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1652 FLAG_SET_DEFAULT(UseLargePages, true);
1653 #endif
1654
1655 // Increase some data structure sizes for efficiency
1656 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1657 return JNI_EINVAL;
1658 }
1659 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1660 return JNI_EINVAL;
1661 }
1662 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1663 return JNI_EINVAL;
1664 }
1665
1666 // See the OldPLABSize comment below, but replace 'after promotion'
1667 // with 'after copying'. YoungPLABSize is the size of the survivor
1668 // space per-gc-thread buffers. The default is 4kw.
1669 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1670 return JNI_EINVAL;
1671 }
1672
1673 // OldPLABSize is the size of the buffers in the old gen that
1674 // UseParallelGC uses to promote live data that doesn't fit in the
1675 // survivor spaces. At any given time, there's one for each gc thread.
1676 // The default size is 1kw. These buffers are rarely used, since the
1677 // survivor spaces are usually big enough. For specjbb, however, there
1678 // are occasions when there's lots of live data in the young gen
1679 // and we end up promoting some of it. We don't have a definite
1680 // explanation for why bumping OldPLABSize helps, but the theory
1681 // is that a bigger PLAB results in retaining something like the
1682 // original allocation order after promotion, which improves mutator
1683 // locality. A minor effect may be that larger PLABs reduce the
1684 // number of PLAB allocation events during gc. The value of 8kw
1685 // was arrived at by experimenting with specjbb.
1686 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1687 return JNI_EINVAL;
1688 }
1689
1690 // Enable parallel GC and adaptive generation sizing
1691 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1692 return JNI_EINVAL;
1693 }
1694
1695 // Encourage steady state memory management
1696 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1697 return JNI_EINVAL;
1698 }
1699
1700 return JNI_OK;
1701 }
1702
1703 // This must be called after ergonomics.
1704 void Arguments::set_bytecode_flags() {
1705 if (!RewriteBytecodes) {
1706 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1707 }
1708 }
1709
1710 // Aggressive optimization flags
1711 jint Arguments::set_aggressive_opts_flags() {
1712 #ifdef COMPILER2
1713 if (AggressiveUnboxing) {
1714 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1715 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1716 } else if (!EliminateAutoBox) {
1717 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1718 AggressiveUnboxing = false;
1719 }
1720 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1721 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1722 } else if (!DoEscapeAnalysis) {
1723 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1724 AggressiveUnboxing = false;
1725 }
1726 }
1727 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1728 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1729 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1730 }
1731 // Feed the cache size setting into the JDK
1732 char buffer[1024];
1733 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1734 if (!add_property(buffer)) {
1735 return JNI_ENOMEM;
1736 }
1737 }
1738 #endif
1739
1740 return JNI_OK;
1741 }
1742
1743 //===========================================================================================================
1744
1745 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1746 if (_sun_java_launcher != _default_java_launcher) {
1747 os::free(const_cast<char*>(_sun_java_launcher));
1748 }
1749 _sun_java_launcher = os::strdup_check_oom(launcher);
1750 }
1751
1752 bool Arguments::created_by_java_launcher() {
1753 assert(_sun_java_launcher != nullptr, "property must have value");
1754 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1755 }
1756
1757 bool Arguments::sun_java_launcher_is_altjvm() {
1758 return _sun_java_launcher_is_altjvm;
1759 }
1760
1761 //===========================================================================================================
1762 // Parsing of main arguments
1763
1764 unsigned int addreads_count = 0;
1765 unsigned int addexports_count = 0;
1766 unsigned int addopens_count = 0;
1767 unsigned int addmods_count = 0;
1768 unsigned int patch_mod_count = 0;
1769 unsigned int enable_native_access_count = 0;
1770
1771 // Check the consistency of vm_init_args
1772 bool Arguments::check_vm_args_consistency() {
1773 // Method for adding checks for flag consistency.
1774 // The intent is to warn the user of all possible conflicts,
1775 // before returning an error.
1776 // Note: Needs platform-dependent factoring.
1777 bool status = true;
1778
1779 if (TLABRefillWasteFraction == 0) {
1780 jio_fprintf(defaultStream::error_stream(),
1781 "TLABRefillWasteFraction should be a denominator, "
1782 "not " SIZE_FORMAT "\n",
1783 TLABRefillWasteFraction);
1784 status = false;
1785 }
1786
1787 status = CompilerConfig::check_args_consistency(status);
1788 #if INCLUDE_JVMCI
1789 if (status && EnableJVMCI) {
1790 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1791 AddProperty, UnwriteableProperty, InternalProperty);
1792 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1793 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1794 return false;
1795 }
1796 }
1797 }
1798 #endif
1799
1800 #if INCLUDE_JFR
1801 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1802 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1803 return false;
1804 }
1805 }
1806 #endif
1807
1808 #ifndef SUPPORT_RESERVED_STACK_AREA
1809 if (StackReservedPages != 0) {
1810 FLAG_SET_CMDLINE(StackReservedPages, 0);
1811 warning("Reserved Stack Area not supported on this platform");
1812 }
1813 #endif
1814
1815 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1816 if (LockingMode == LM_LIGHTWEIGHT) {
1817 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1818 warning("New lightweight locking not supported on this platform");
1819 }
1820 #endif
1821
1822 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1823 if (LockingMode == LM_MONITOR) {
1824 jio_fprintf(defaultStream::error_stream(),
1825 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1826 return false;
1827 }
1828 #endif
1829 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1830 jio_fprintf(defaultStream::error_stream(),
1831 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1832 return false;
1833 }
1834 return status;
1835 }
1836
1837 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1838 const char* option_type) {
1839 if (ignore) return false;
1840
1841 const char* spacer = " ";
1842 if (option_type == nullptr) {
1843 option_type = ++spacer; // Set both to the empty string.
1844 }
1845
1846 jio_fprintf(defaultStream::error_stream(),
1847 "Unrecognized %s%soption: %s\n", option_type, spacer,
1848 option->optionString);
1849 return true;
1850 }
1851
1852 static const char* user_assertion_options[] = {
1853 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1854 };
1855
1856 static const char* system_assertion_options[] = {
1857 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1858 };
1859
1860 bool Arguments::parse_uint(const char* value,
1861 uint* uint_arg,
1862 uint min_size) {
1863 uint n;
1864 if (!parse_integer(value, &n)) {
1865 return false;
1866 }
1867 if (n >= min_size) {
1868 *uint_arg = n;
1869 return true;
1870 } else {
1871 return false;
1872 }
1873 }
1874
1875 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1876 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1877 CDSConfig::check_internal_module_property(prop_name, prop_value);
1878 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1879 char* property = AllocateHeap(prop_len, mtArguments);
1880 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1881 if (ret < 0 || ret >= (int)prop_len) {
1882 FreeHeap(property);
1883 return false;
1884 }
1885 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1886 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1887 // that multiple occurrences of the associated flag just causes the existing property value to be
1888 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1889 // to a property after we have finished flag processing.
1890 bool added = add_property(property, WriteableProperty, internal);
1891 FreeHeap(property);
1892 return added;
1893 }
1894
1895 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1896 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1897 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1898 const unsigned int props_count_limit = 1000;
1899 const int max_digits = 3;
1900 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1901
1902 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1903 if (count < props_count_limit) {
1904 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1905 char* property = AllocateHeap(prop_len, mtArguments);
1906 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1907 if (ret < 0 || ret >= (int)prop_len) {
1908 FreeHeap(property);
1909 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1910 return false;
1911 }
1912 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1913 FreeHeap(property);
1914 return added;
1915 }
1916
1917 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1918 return false;
1919 }
1920
1921 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1922 julong* long_arg,
1923 julong min_size,
1924 julong max_size) {
1925 if (!parse_integer(s, long_arg)) return arg_unreadable;
1926 return check_memory_size(*long_arg, min_size, max_size);
1927 }
1928
1929 // Parse JavaVMInitArgs structure
1930
1931 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1932 const JavaVMInitArgs *java_tool_options_args,
1933 const JavaVMInitArgs *java_options_args,
1934 const JavaVMInitArgs *cmd_line_args) {
1935 bool patch_mod_javabase = false;
1936
1937 // Save default settings for some mode flags
1938 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1939 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1940 Arguments::_ClipInlining = ClipInlining;
1941 Arguments::_BackgroundCompilation = BackgroundCompilation;
1942
1943 // Remember the default value of SharedBaseAddress.
1944 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1945
1946 // Setup flags for mixed which is the default
1947 set_mode_flags(_mixed);
1948
1949 // Parse args structure generated from java.base vm options resource
1950 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1951 if (result != JNI_OK) {
1952 return result;
1953 }
1954
1955 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1956 // variable (if present).
1957 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1958 if (result != JNI_OK) {
1959 return result;
1960 }
1961
1962 // Parse args structure generated from the command line flags.
1963 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1964 if (result != JNI_OK) {
1965 return result;
1966 }
1967
1968 // Parse args structure generated from the _JAVA_OPTIONS environment
1969 // variable (if present) (mimics classic VM)
1970 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1971 if (result != JNI_OK) {
1972 return result;
1973 }
1974
1975 // Disable CDS for exploded image
1976 if (!has_jimage()) {
1977 no_shared_spaces("CDS disabled on exploded JDK");
1978 }
1979
1980 // We need to ensure processor and memory resources have been properly
1981 // configured - which may rely on arguments we just processed - before
1982 // doing the final argument processing. Any argument processing that
1983 // needs to know about processor and memory resources must occur after
1984 // this point.
1985
1986 os::init_container_support();
1987
1988 SystemMemoryBarrier::initialize();
1989
1990 // Do final processing now that all arguments have been parsed
1991 result = finalize_vm_init_args(patch_mod_javabase);
1992 if (result != JNI_OK) {
1993 return result;
1994 }
1995
1996 return JNI_OK;
1997 }
1998
1999 #if !INCLUDE_JVMTI
2000 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2001 // represents a valid JDWP agent. is_path==true denotes that we
2002 // are dealing with -agentpath (case where name is a path), otherwise with
2003 // -agentlib
2004 static bool valid_jdwp_agent(char *name, bool is_path) {
2005 char *_name;
2006 const char *_jdwp = "jdwp";
2007 size_t _len_jdwp, _len_prefix;
2008
2009 if (is_path) {
2010 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2011 return false;
2012 }
2013
2014 _name++; // skip past last path separator
2015 _len_prefix = strlen(JNI_LIB_PREFIX);
2016
2017 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2018 return false;
2019 }
2020
2021 _name += _len_prefix;
2022 _len_jdwp = strlen(_jdwp);
2023
2024 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2025 _name += _len_jdwp;
2026 }
2027 else {
2028 return false;
2029 }
2030
2031 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2032 return false;
2033 }
2034
2035 return true;
2036 }
2037
2038 if (strcmp(name, _jdwp) == 0) {
2039 return true;
2040 }
2041
2042 return false;
2043 }
2044 #endif
2045
2046 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2047 // --patch-module=<module>=<file>(<pathsep><file>)*
2048 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2049 // Find the equal sign between the module name and the path specification
2050 const char* module_equal = strchr(patch_mod_tail, '=');
2051 if (module_equal == nullptr) {
2052 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2053 return JNI_ERR;
2054 } else {
2055 // Pick out the module name
2056 size_t module_len = module_equal - patch_mod_tail;
2057 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2058 if (module_name != nullptr) {
2059 memcpy(module_name, patch_mod_tail, module_len);
2060 *(module_name + module_len) = '\0';
2061 // The path piece begins one past the module_equal sign
2062 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2063 FREE_C_HEAP_ARRAY(char, module_name);
2064 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2065 return JNI_ENOMEM;
2066 }
2067 } else {
2068 return JNI_ENOMEM;
2069 }
2070 }
2071 return JNI_OK;
2072 }
2073
2074 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2075 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2076 // The min and max sizes match the values in globals.hpp, but scaled
2077 // with K. The values have been chosen so that alignment with page
2078 // size doesn't change the max value, which makes the conversions
2079 // back and forth between Xss value and ThreadStackSize value easier.
2080 // The values have also been chosen to fit inside a 32-bit signed type.
2081 const julong min_ThreadStackSize = 0;
2082 const julong max_ThreadStackSize = 1 * M;
2083
2084 // Make sure the above values match the range set in globals.hpp
2085 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2086 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2087 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2088
2089 const julong min_size = min_ThreadStackSize * K;
2090 const julong max_size = max_ThreadStackSize * K;
2091
2092 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2093
2094 julong size = 0;
2095 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2096 if (errcode != arg_in_range) {
2097 bool silent = (option == nullptr); // Allow testing to silence error messages
2098 if (!silent) {
2099 jio_fprintf(defaultStream::error_stream(),
2100 "Invalid thread stack size: %s\n", option->optionString);
2101 describe_range_error(errcode);
2102 }
2103 return JNI_EINVAL;
2104 }
2105
2106 // Internally track ThreadStackSize in units of 1024 bytes.
2107 const julong size_aligned = align_up(size, K);
2108 assert(size <= size_aligned,
2109 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2110 size, size_aligned);
2111
2112 const julong size_in_K = size_aligned / K;
2113 assert(size_in_K < (julong)max_intx,
2114 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2115 size_in_K);
2116
2117 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2118 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2119 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2120 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2121 max_expanded, size_in_K);
2122
2123 *out_ThreadStackSize = (intx)size_in_K;
2124
2125 return JNI_OK;
2126 }
2127
2128 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2129 // For match_option to return remaining or value part of option string
2130 const char* tail;
2131
2132 // iterate over arguments
2133 for (int index = 0; index < args->nOptions; index++) {
2134 bool is_absolute_path = false; // for -agentpath vs -agentlib
2135
2136 const JavaVMOption* option = args->options + index;
2137
2138 if (!match_option(option, "-Djava.class.path", &tail) &&
2139 !match_option(option, "-Dsun.java.command", &tail) &&
2140 !match_option(option, "-Dsun.java.launcher", &tail)) {
2141
2142 // add all jvm options to the jvm_args string. This string
2143 // is used later to set the java.vm.args PerfData string constant.
2144 // the -Djava.class.path and the -Dsun.java.command options are
2145 // omitted from jvm_args string as each have their own PerfData
2146 // string constant object.
2147 build_jvm_args(option->optionString);
2148 }
2149
2150 // -verbose:[class/module/gc/jni]
2151 if (match_option(option, "-verbose", &tail)) {
2152 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2153 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2154 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2155 } else if (!strcmp(tail, ":module")) {
2156 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2157 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2158 } else if (!strcmp(tail, ":gc")) {
2159 if (_legacyGCLogging.lastFlag == 0) {
2160 _legacyGCLogging.lastFlag = 1;
2161 }
2162 } else if (!strcmp(tail, ":jni")) {
2163 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2164 }
2165 // -da / -ea / -disableassertions / -enableassertions
2166 // These accept an optional class/package name separated by a colon, e.g.,
2167 // -da:java.lang.Thread.
2168 } else if (match_option(option, user_assertion_options, &tail, true)) {
2169 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2170 if (*tail == '\0') {
2171 JavaAssertions::setUserClassDefault(enable);
2172 } else {
2173 assert(*tail == ':', "bogus match by match_option()");
2174 JavaAssertions::addOption(tail + 1, enable);
2175 }
2176 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2177 } else if (match_option(option, system_assertion_options, &tail, false)) {
2178 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2179 JavaAssertions::setSystemClassDefault(enable);
2180 // -bootclasspath:
2181 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2182 jio_fprintf(defaultStream::output_stream(),
2183 "-Xbootclasspath is no longer a supported option.\n");
2184 return JNI_EINVAL;
2185 // -bootclasspath/a:
2186 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2187 Arguments::append_sysclasspath(tail);
2188 // -bootclasspath/p:
2189 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2190 jio_fprintf(defaultStream::output_stream(),
2191 "-Xbootclasspath/p is no longer a supported option.\n");
2192 return JNI_EINVAL;
2193 // -Xrun
2194 } else if (match_option(option, "-Xrun", &tail)) {
2195 if (tail != nullptr) {
2196 const char* pos = strchr(tail, ':');
2197 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2198 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2199 jio_snprintf(name, len + 1, "%s", tail);
2200
2201 char *options = nullptr;
2202 if(pos != nullptr) {
2203 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2204 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2205 }
2206 #if !INCLUDE_JVMTI
2207 if (strcmp(name, "jdwp") == 0) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "Debugging agents are not supported in this VM\n");
2210 return JNI_ERR;
2211 }
2212 #endif // !INCLUDE_JVMTI
2213 JvmtiAgentList::add_xrun(name, options, false);
2214 FREE_C_HEAP_ARRAY(char, name);
2215 FREE_C_HEAP_ARRAY(char, options);
2216 }
2217 } else if (match_option(option, "--add-reads=", &tail)) {
2218 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2219 return JNI_ENOMEM;
2220 }
2221 } else if (match_option(option, "--add-exports=", &tail)) {
2222 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2223 return JNI_ENOMEM;
2224 }
2225 } else if (match_option(option, "--add-opens=", &tail)) {
2226 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2227 return JNI_ENOMEM;
2228 }
2229 } else if (match_option(option, "--add-modules=", &tail)) {
2230 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2231 return JNI_ENOMEM;
2232 }
2233 } else if (match_option(option, "--enable-native-access=", &tail)) {
2234 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2235 return JNI_ENOMEM;
2236 }
2237 } else if (match_option(option, "--limit-modules=", &tail)) {
2238 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2239 return JNI_ENOMEM;
2240 }
2241 } else if (match_option(option, "--module-path=", &tail)) {
2242 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2243 return JNI_ENOMEM;
2244 }
2245 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2246 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2247 return JNI_ENOMEM;
2248 }
2249 } else if (match_option(option, "--patch-module=", &tail)) {
2250 // --patch-module=<module>=<file>(<pathsep><file>)*
2251 int res = process_patch_mod_option(tail, patch_mod_javabase);
2252 if (res != JNI_OK) {
2253 return res;
2254 }
2255 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2256 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2257 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2258 AddProperty, WriteableProperty, InternalProperty);
2259 } else {
2260 jio_fprintf(defaultStream::error_stream(),
2261 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2262 return JNI_ERR;
2263 }
2264 } else if (match_option(option, "--illegal-access=", &tail)) {
2265 char version[256];
2266 JDK_Version::jdk(17).to_string(version, sizeof(version));
2267 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2268 // -agentlib and -agentpath
2269 } else if (match_option(option, "-agentlib:", &tail) ||
2270 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2271 if(tail != nullptr) {
2272 const char* pos = strchr(tail, '=');
2273 char* name;
2274 if (pos == nullptr) {
2275 name = os::strdup_check_oom(tail, mtArguments);
2276 } else {
2277 size_t len = pos - tail;
2278 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2279 memcpy(name, tail, len);
2280 name[len] = '\0';
2281 }
2282
2283 char *options = nullptr;
2284 if(pos != nullptr) {
2285 options = os::strdup_check_oom(pos + 1, mtArguments);
2286 }
2287 #if !INCLUDE_JVMTI
2288 if (valid_jdwp_agent(name, is_absolute_path)) {
2289 jio_fprintf(defaultStream::error_stream(),
2290 "Debugging agents are not supported in this VM\n");
2291 return JNI_ERR;
2292 }
2293 #endif // !INCLUDE_JVMTI
2294 JvmtiAgentList::add(name, options, is_absolute_path);
2295 os::free(name);
2296 os::free(options);
2297 }
2298 // -javaagent
2299 } else if (match_option(option, "-javaagent:", &tail)) {
2300 #if !INCLUDE_JVMTI
2301 jio_fprintf(defaultStream::error_stream(),
2302 "Instrumentation agents are not supported in this VM\n");
2303 return JNI_ERR;
2304 #else
2305 if (tail != nullptr) {
2306 size_t length = strlen(tail) + 1;
2307 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2308 jio_snprintf(options, length, "%s", tail);
2309 JvmtiAgentList::add("instrument", options, false);
2310 FREE_C_HEAP_ARRAY(char, options);
2311
2312 // java agents need module java.instrument
2313 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2314 return JNI_ENOMEM;
2315 }
2316 }
2317 #endif // !INCLUDE_JVMTI
2318 // --enable_preview
2319 } else if (match_option(option, "--enable-preview")) {
2320 set_enable_preview();
2321 // -Xnoclassgc
2322 } else if (match_option(option, "-Xnoclassgc")) {
2323 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2324 return JNI_EINVAL;
2325 }
2326 // -Xbatch
2327 } else if (match_option(option, "-Xbatch")) {
2328 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2329 return JNI_EINVAL;
2330 }
2331 // -Xmn for compatibility with other JVM vendors
2332 } else if (match_option(option, "-Xmn", &tail)) {
2333 julong long_initial_young_size = 0;
2334 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2335 if (errcode != arg_in_range) {
2336 jio_fprintf(defaultStream::error_stream(),
2337 "Invalid initial young generation size: %s\n", option->optionString);
2338 describe_range_error(errcode);
2339 return JNI_EINVAL;
2340 }
2341 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2342 return JNI_EINVAL;
2343 }
2344 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2345 return JNI_EINVAL;
2346 }
2347 // -Xms
2348 } else if (match_option(option, "-Xms", &tail)) {
2349 julong size = 0;
2350 // an initial heap size of 0 means automatically determine
2351 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2352 if (errcode != arg_in_range) {
2353 jio_fprintf(defaultStream::error_stream(),
2354 "Invalid initial heap size: %s\n", option->optionString);
2355 describe_range_error(errcode);
2356 return JNI_EINVAL;
2357 }
2358 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2359 return JNI_EINVAL;
2360 }
2361 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2362 return JNI_EINVAL;
2363 }
2364 // -Xmx
2365 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2366 julong long_max_heap_size = 0;
2367 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2368 if (errcode != arg_in_range) {
2369 jio_fprintf(defaultStream::error_stream(),
2370 "Invalid maximum heap size: %s\n", option->optionString);
2371 describe_range_error(errcode);
2372 return JNI_EINVAL;
2373 }
2374 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2375 return JNI_EINVAL;
2376 }
2377 // Xmaxf
2378 } else if (match_option(option, "-Xmaxf", &tail)) {
2379 char* err;
2380 int maxf = (int)(strtod(tail, &err) * 100);
2381 if (*err != '\0' || *tail == '\0') {
2382 jio_fprintf(defaultStream::error_stream(),
2383 "Bad max heap free percentage size: %s\n",
2384 option->optionString);
2385 return JNI_EINVAL;
2386 } else {
2387 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2388 return JNI_EINVAL;
2389 }
2390 }
2391 // Xminf
2392 } else if (match_option(option, "-Xminf", &tail)) {
2393 char* err;
2394 int minf = (int)(strtod(tail, &err) * 100);
2395 if (*err != '\0' || *tail == '\0') {
2396 jio_fprintf(defaultStream::error_stream(),
2397 "Bad min heap free percentage size: %s\n",
2398 option->optionString);
2399 return JNI_EINVAL;
2400 } else {
2401 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2402 return JNI_EINVAL;
2403 }
2404 }
2405 // -Xss
2406 } else if (match_option(option, "-Xss", &tail)) {
2407 intx value = 0;
2408 jint err = parse_xss(option, tail, &value);
2409 if (err != JNI_OK) {
2410 return err;
2411 }
2412 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2413 return JNI_EINVAL;
2414 }
2415 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2416 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2417 julong long_ReservedCodeCacheSize = 0;
2418
2419 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2420 if (errcode != arg_in_range) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "Invalid maximum code cache size: %s.\n", option->optionString);
2423 return JNI_EINVAL;
2424 }
2425 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2426 return JNI_EINVAL;
2427 }
2428 // -green
2429 } else if (match_option(option, "-green")) {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Green threads support not available\n");
2432 return JNI_EINVAL;
2433 // -native
2434 } else if (match_option(option, "-native")) {
2435 // HotSpot always uses native threads, ignore silently for compatibility
2436 // -Xrs
2437 } else if (match_option(option, "-Xrs")) {
2438 // Classic/EVM option, new functionality
2439 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2440 return JNI_EINVAL;
2441 }
2442 // -Xprof
2443 } else if (match_option(option, "-Xprof")) {
2444 char version[256];
2445 // Obsolete in JDK 10
2446 JDK_Version::jdk(10).to_string(version, sizeof(version));
2447 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2448 // -Xinternalversion
2449 } else if (match_option(option, "-Xinternalversion")) {
2450 jio_fprintf(defaultStream::output_stream(), "%s\n",
2451 VM_Version::internal_vm_info_string());
2452 vm_exit(0);
2453 #ifndef PRODUCT
2454 // -Xprintflags
2455 } else if (match_option(option, "-Xprintflags")) {
2456 JVMFlag::printFlags(tty, false);
2457 vm_exit(0);
2458 #endif
2459 // -D
2460 } else if (match_option(option, "-D", &tail)) {
2461 const char* value;
2462 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2463 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2464 // abort if -Djava.endorsed.dirs is set
2465 jio_fprintf(defaultStream::output_stream(),
2466 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2467 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2468 return JNI_EINVAL;
2469 }
2470 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2471 *value != '\0' && strcmp(value, "\"\"") != 0) {
2472 // abort if -Djava.ext.dirs is set
2473 jio_fprintf(defaultStream::output_stream(),
2474 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2475 return JNI_EINVAL;
2476 }
2477 // Check for module related properties. They must be set using the modules
2478 // options. For example: use "--add-modules=java.sql", not
2479 // "-Djdk.module.addmods=java.sql"
2480 if (is_internal_module_property(option->optionString + 2)) {
2481 needs_module_property_warning = true;
2482 continue;
2483 }
2484 if (!add_property(tail)) {
2485 return JNI_ENOMEM;
2486 }
2487 // Out of the box management support
2488 if (match_option(option, "-Dcom.sun.management", &tail)) {
2489 #if INCLUDE_MANAGEMENT
2490 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2491 return JNI_EINVAL;
2492 }
2493 // management agent in module jdk.management.agent
2494 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2495 return JNI_ENOMEM;
2496 }
2497 #else
2498 jio_fprintf(defaultStream::output_stream(),
2499 "-Dcom.sun.management is not supported in this VM.\n");
2500 return JNI_ERR;
2501 #endif
2502 }
2503 // -Xint
2504 } else if (match_option(option, "-Xint")) {
2505 set_mode_flags(_int);
2506 mode_flag_cmd_line = true;
2507 // -Xmixed
2508 } else if (match_option(option, "-Xmixed")) {
2509 set_mode_flags(_mixed);
2510 mode_flag_cmd_line = true;
2511 // -Xcomp
2512 } else if (match_option(option, "-Xcomp")) {
2513 // for testing the compiler; turn off all flags that inhibit compilation
2514 set_mode_flags(_comp);
2515 mode_flag_cmd_line = true;
2516 // -Xshare:dump
2517 } else if (match_option(option, "-Xshare:dump")) {
2518 CDSConfig::enable_dumping_static_archive();
2519 // -Xshare:on
2520 } else if (match_option(option, "-Xshare:on")) {
2521 UseSharedSpaces = true;
2522 RequireSharedSpaces = true;
2523 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2524 } else if (match_option(option, "-Xshare:auto")) {
2525 UseSharedSpaces = true;
2526 RequireSharedSpaces = false;
2527 xshare_auto_cmd_line = true;
2528 // -Xshare:off
2529 } else if (match_option(option, "-Xshare:off")) {
2530 UseSharedSpaces = false;
2531 RequireSharedSpaces = false;
2532 // -Xverify
2533 } else if (match_option(option, "-Xverify", &tail)) {
2534 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2535 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2536 return JNI_EINVAL;
2537 }
2538 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2539 return JNI_EINVAL;
2540 }
2541 } else if (strcmp(tail, ":remote") == 0) {
2542 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2543 return JNI_EINVAL;
2544 }
2545 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2546 return JNI_EINVAL;
2547 }
2548 } else if (strcmp(tail, ":none") == 0) {
2549 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2550 return JNI_EINVAL;
2551 }
2552 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2553 return JNI_EINVAL;
2554 }
2555 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2556 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2557 return JNI_EINVAL;
2558 }
2559 // -Xdebug
2560 } else if (match_option(option, "-Xdebug")) {
2561 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2562 } else if (match_option(option, "-Xloggc:", &tail)) {
2563 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2564 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2565 _legacyGCLogging.lastFlag = 2;
2566 _legacyGCLogging.file = os::strdup_check_oom(tail);
2567 } else if (match_option(option, "-Xlog", &tail)) {
2568 bool ret = false;
2569 if (strcmp(tail, ":help") == 0) {
2570 fileStream stream(defaultStream::output_stream());
2571 LogConfiguration::print_command_line_help(&stream);
2572 vm_exit(0);
2573 } else if (strcmp(tail, ":disable") == 0) {
2574 LogConfiguration::disable_logging();
2575 ret = true;
2576 } else if (strcmp(tail, ":async") == 0) {
2577 LogConfiguration::set_async_mode(true);
2578 ret = true;
2579 } else if (*tail == '\0') {
2580 ret = LogConfiguration::parse_command_line_arguments();
2581 assert(ret, "-Xlog without arguments should never fail to parse");
2582 } else if (*tail == ':') {
2583 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2584 }
2585 if (ret == false) {
2586 jio_fprintf(defaultStream::error_stream(),
2587 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2588 tail);
2589 return JNI_EINVAL;
2590 }
2591 // JNI hooks
2592 } else if (match_option(option, "-Xcheck", &tail)) {
2593 if (!strcmp(tail, ":jni")) {
2594 #if !INCLUDE_JNI_CHECK
2595 warning("JNI CHECKING is not supported in this VM");
2596 #else
2597 CheckJNICalls = true;
2598 #endif // INCLUDE_JNI_CHECK
2599 } else if (is_bad_option(option, args->ignoreUnrecognized,
2600 "check")) {
2601 return JNI_EINVAL;
2602 }
2603 } else if (match_option(option, "vfprintf")) {
2604 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2605 } else if (match_option(option, "exit")) {
2606 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2607 } else if (match_option(option, "abort")) {
2608 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2609 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2610 // and the last option wins.
2611 } else if (match_option(option, "-XX:+NeverTenure")) {
2612 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2613 return JNI_EINVAL;
2614 }
2615 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2616 return JNI_EINVAL;
2617 }
2618 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2619 return JNI_EINVAL;
2620 }
2621 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2622 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2623 return JNI_EINVAL;
2624 }
2625 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2626 return JNI_EINVAL;
2627 }
2628 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2629 return JNI_EINVAL;
2630 }
2631 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2632 uint max_tenuring_thresh = 0;
2633 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2634 jio_fprintf(defaultStream::error_stream(),
2635 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2636 return JNI_EINVAL;
2637 }
2638
2639 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2640 return JNI_EINVAL;
2641 }
2642
2643 if (MaxTenuringThreshold == 0) {
2644 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2645 return JNI_EINVAL;
2646 }
2647 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2648 return JNI_EINVAL;
2649 }
2650 } else {
2651 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2652 return JNI_EINVAL;
2653 }
2654 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2655 return JNI_EINVAL;
2656 }
2657 }
2658 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2659 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2660 return JNI_EINVAL;
2661 }
2662 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2666 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2670 return JNI_EINVAL;
2671 }
2672 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2673 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2674 return JNI_EINVAL;
2675 }
2676 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2677 return JNI_EINVAL;
2678 }
2679 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2680 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2681 return JNI_EINVAL;
2682 }
2683 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2684 return JNI_EINVAL;
2685 }
2686 } else if (match_option(option, "--finalization=", &tail)) {
2687 if (strcmp(tail, "enabled") == 0) {
2688 InstanceKlass::set_finalization_enabled(true);
2689 } else if (strcmp(tail, "disabled") == 0) {
2690 InstanceKlass::set_finalization_enabled(false);
2691 } else {
2692 jio_fprintf(defaultStream::error_stream(),
2693 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2694 tail);
2695 return JNI_EINVAL;
2696 }
2697 #if !defined(DTRACE_ENABLED)
2698 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2699 jio_fprintf(defaultStream::error_stream(),
2700 "DTraceMethodProbes flag is not applicable for this configuration\n");
2701 return JNI_EINVAL;
2702 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2703 jio_fprintf(defaultStream::error_stream(),
2704 "DTraceAllocProbes flag is not applicable for this configuration\n");
2705 return JNI_EINVAL;
2706 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2707 jio_fprintf(defaultStream::error_stream(),
2708 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2709 return JNI_EINVAL;
2710 #endif // !defined(DTRACE_ENABLED)
2711 #ifdef ASSERT
2712 } else if (match_option(option, "-XX:+FullGCALot")) {
2713 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2714 return JNI_EINVAL;
2715 }
2716 #endif
2717 #if !INCLUDE_MANAGEMENT
2718 } else if (match_option(option, "-XX:+ManagementServer")) {
2719 jio_fprintf(defaultStream::error_stream(),
2720 "ManagementServer is not supported in this VM.\n");
2721 return JNI_ERR;
2722 #endif // INCLUDE_MANAGEMENT
2723 #if INCLUDE_JVMCI
2724 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2725 if (EnableJVMCIProduct) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2728 return JNI_EINVAL;
2729 }
2730 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2731 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2732 if (use_graal_jit) {
2733 const char* jvmci_compiler = get_property("jvmci.Compiler");
2734 if (jvmci_compiler != nullptr) {
2735 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2738 return JNI_ERR;
2739 }
2740 } else if (!add_property("jvmci.Compiler=graal")) {
2741 return JNI_ENOMEM;
2742 }
2743 }
2744
2745 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2746 if (EnableJVMCIProduct) {
2747 continue;
2748 }
2749 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2750 // Allow this flag if it has been unlocked.
2751 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2752 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2753 jio_fprintf(defaultStream::error_stream(),
2754 "Unable to enable JVMCI in product mode\n");
2755 return JNI_ERR;
2756 }
2757 }
2758 // The flag was locked so process normally to report that error
2759 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2760 return JNI_EINVAL;
2761 }
2762 #endif // INCLUDE_JVMCI
2763 #if INCLUDE_JFR
2764 } else if (match_jfr_option(&option)) {
2765 return JNI_EINVAL;
2766 #endif
2767 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2768 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2769 // already been handled
2770 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2771 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2772 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2773 return JNI_EINVAL;
2774 }
2775 }
2776 // Unknown option
2777 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2778 return JNI_ERR;
2779 }
2780 }
2781
2782 // PrintSharedArchiveAndExit will turn on
2783 // -Xshare:on
2784 // -Xlog:class+path=info
2785 if (PrintSharedArchiveAndExit) {
2786 UseSharedSpaces = true;
2787 RequireSharedSpaces = true;
2788 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2789 }
2790
2791 fix_appclasspath();
2792
2793 return JNI_OK;
2794 }
2795
2796 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2797 // For java.base check for duplicate --patch-module options being specified on the command line.
2798 // This check is only required for java.base, all other duplicate module specifications
2799 // will be checked during module system initialization. The module system initialization
2800 // will throw an ExceptionInInitializerError if this situation occurs.
2801 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2802 if (*patch_mod_javabase) {
2803 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2804 } else {
2805 *patch_mod_javabase = true;
2806 }
2807 }
2808
2809 // Create GrowableArray lazily, only if --patch-module has been specified
2810 if (_patch_mod_prefix == nullptr) {
2811 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2812 }
2813
2814 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2815 }
2816
2817 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2818 //
2819 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2820 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2821 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2822 // path is treated as the current directory.
2823 //
2824 // This causes problems with CDS, which requires that all directories specified in the classpath
2825 // must be empty. In most cases, applications do NOT want to load classes from the current
2826 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2827 // scripts compatible with CDS.
2828 void Arguments::fix_appclasspath() {
2829 if (IgnoreEmptyClassPaths) {
2830 const char separator = *os::path_separator();
2831 const char* src = _java_class_path->value();
2832
2833 // skip over all the leading empty paths
2834 while (*src == separator) {
2835 src ++;
2836 }
2837
2838 char* copy = os::strdup_check_oom(src, mtArguments);
2839
2840 // trim all trailing empty paths
2841 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2842 *tail = '\0';
2843 }
2844
2845 char from[3] = {separator, separator, '\0'};
2846 char to [2] = {separator, '\0'};
2847 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2848 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2849 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2850 }
2851
2852 _java_class_path->set_writeable_value(copy);
2853 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2854 }
2855 }
2856
2857 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2858 // check if the default lib/endorsed directory exists; if so, error
2859 char path[JVM_MAXPATHLEN];
2860 const char* fileSep = os::file_separator();
2861 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2862
2863 DIR* dir = os::opendir(path);
2864 if (dir != nullptr) {
2865 jio_fprintf(defaultStream::output_stream(),
2866 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2867 "in modular form will be supported via the concept of upgradeable modules.\n");
2868 os::closedir(dir);
2869 return JNI_ERR;
2870 }
2871
2872 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2873 dir = os::opendir(path);
2874 if (dir != nullptr) {
2875 jio_fprintf(defaultStream::output_stream(),
2876 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2877 "Use -classpath instead.\n.");
2878 os::closedir(dir);
2879 return JNI_ERR;
2880 }
2881
2882 // This must be done after all arguments have been processed
2883 // and the container support has been initialized since AggressiveHeap
2884 // relies on the amount of total memory available.
2885 if (AggressiveHeap) {
2886 jint result = set_aggressive_heap_flags();
2887 if (result != JNI_OK) {
2888 return result;
2889 }
2890 }
2891
2892 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2893 // but like -Xint, leave compilation thresholds unaffected.
2894 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2895 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2896 set_mode_flags(_int);
2897 }
2898
2899 #ifdef ZERO
2900 // Zero always runs in interpreted mode
2901 set_mode_flags(_int);
2902 #endif
2903
2904 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2905 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2906 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2907 }
2908
2909 #if !COMPILER2_OR_JVMCI
2910 // Don't degrade server performance for footprint
2911 if (FLAG_IS_DEFAULT(UseLargePages) &&
2912 MaxHeapSize < LargePageHeapSizeThreshold) {
2913 // No need for large granularity pages w/small heaps.
2914 // Note that large pages are enabled/disabled for both the
2915 // Java heap and the code cache.
2916 FLAG_SET_DEFAULT(UseLargePages, false);
2917 }
2918
2919 UNSUPPORTED_OPTION(ProfileInterpreter);
2920 #endif
2921
2922 // Parse the CompilationMode flag
2923 if (!CompilationModeFlag::initialize()) {
2924 return JNI_ERR;
2925 }
2926
2927 if (!check_vm_args_consistency()) {
2928 return JNI_ERR;
2929 }
2930
2931 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
2932 return JNI_ERR;
2933 }
2934
2935 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2936 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2937 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2938
2939 return JNI_OK;
2940 }
2941
2942 // Helper class for controlling the lifetime of JavaVMInitArgs
2943 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2944 // deleted on the destruction of the ScopedVMInitArgs object.
2945 class ScopedVMInitArgs : public StackObj {
2946 private:
2947 JavaVMInitArgs _args;
2948 char* _container_name;
2949 bool _is_set;
2950 char* _vm_options_file_arg;
2951
2952 public:
2953 ScopedVMInitArgs(const char *container_name) {
2954 _args.version = JNI_VERSION_1_2;
2955 _args.nOptions = 0;
2956 _args.options = nullptr;
2957 _args.ignoreUnrecognized = false;
2958 _container_name = (char *)container_name;
2959 _is_set = false;
2960 _vm_options_file_arg = nullptr;
2961 }
2962
2963 // Populates the JavaVMInitArgs object represented by this
2964 // ScopedVMInitArgs object with the arguments in options. The
2965 // allocated memory is deleted by the destructor. If this method
2966 // returns anything other than JNI_OK, then this object is in a
2967 // partially constructed state, and should be abandoned.
2968 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2969 _is_set = true;
2970 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2971 JavaVMOption, options->length(), mtArguments);
2972 if (options_arr == nullptr) {
2973 return JNI_ENOMEM;
2974 }
2975 _args.options = options_arr;
2976
2977 for (int i = 0; i < options->length(); i++) {
2978 options_arr[i] = options->at(i);
2979 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2980 if (options_arr[i].optionString == nullptr) {
2981 // Rely on the destructor to do cleanup.
2982 _args.nOptions = i;
2983 return JNI_ENOMEM;
2984 }
2985 }
2986
2987 _args.nOptions = options->length();
2988 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2989 return JNI_OK;
2990 }
2991
2992 JavaVMInitArgs* get() { return &_args; }
2993 char* container_name() { return _container_name; }
2994 bool is_set() { return _is_set; }
2995 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
2996 char* vm_options_file_arg() { return _vm_options_file_arg; }
2997
2998 void set_vm_options_file_arg(const char *vm_options_file_arg) {
2999 if (_vm_options_file_arg != nullptr) {
3000 os::free(_vm_options_file_arg);
3001 }
3002 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3003 }
3004
3005 ~ScopedVMInitArgs() {
3006 if (_vm_options_file_arg != nullptr) {
3007 os::free(_vm_options_file_arg);
3008 }
3009 if (_args.options == nullptr) return;
3010 for (int i = 0; i < _args.nOptions; i++) {
3011 os::free(_args.options[i].optionString);
3012 }
3013 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3014 }
3015
3016 // Insert options into this option list, to replace option at
3017 // vm_options_file_pos (-XX:VMOptionsFile)
3018 jint insert(const JavaVMInitArgs* args,
3019 const JavaVMInitArgs* args_to_insert,
3020 const int vm_options_file_pos) {
3021 assert(_args.options == nullptr, "shouldn't be set yet");
3022 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3023 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3024
3025 int length = args->nOptions + args_to_insert->nOptions - 1;
3026 // Construct new option array
3027 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3028 for (int i = 0; i < args->nOptions; i++) {
3029 if (i == vm_options_file_pos) {
3030 // insert the new options starting at the same place as the
3031 // -XX:VMOptionsFile option
3032 for (int j = 0; j < args_to_insert->nOptions; j++) {
3033 options.push(args_to_insert->options[j]);
3034 }
3035 } else {
3036 options.push(args->options[i]);
3037 }
3038 }
3039 // make into options array
3040 return set_args(&options);
3041 }
3042 };
3043
3044 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3045 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3046 }
3047
3048 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3049 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3050 }
3051
3052 jint Arguments::parse_options_environment_variable(const char* name,
3053 ScopedVMInitArgs* vm_args) {
3054 char *buffer = ::getenv(name);
3055
3056 // Don't check this environment variable if user has special privileges
3057 // (e.g. unix su command).
3058 if (buffer == nullptr || os::have_special_privileges()) {
3059 return JNI_OK;
3060 }
3061
3062 if ((buffer = os::strdup(buffer)) == nullptr) {
3063 return JNI_ENOMEM;
3064 }
3065
3066 jio_fprintf(defaultStream::error_stream(),
3067 "Picked up %s: %s\n", name, buffer);
3068
3069 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3070
3071 os::free(buffer);
3072 return retcode;
3073 }
3074
3075 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3076 // read file into buffer
3077 int fd = ::open(file_name, O_RDONLY);
3078 if (fd < 0) {
3079 jio_fprintf(defaultStream::error_stream(),
3080 "Could not open options file '%s'\n",
3081 file_name);
3082 return JNI_ERR;
3083 }
3084
3085 struct stat stbuf;
3086 int retcode = os::stat(file_name, &stbuf);
3087 if (retcode != 0) {
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Could not stat options file '%s'\n",
3090 file_name);
3091 ::close(fd);
3092 return JNI_ERR;
3093 }
3094
3095 if (stbuf.st_size == 0) {
3096 // tell caller there is no option data and that is ok
3097 ::close(fd);
3098 return JNI_OK;
3099 }
3100
3101 // '+ 1' for null termination even with max bytes
3102 size_t bytes_alloc = stbuf.st_size + 1;
3103
3104 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3105 if (nullptr == buf) {
3106 jio_fprintf(defaultStream::error_stream(),
3107 "Could not allocate read buffer for options file parse\n");
3108 ::close(fd);
3109 return JNI_ENOMEM;
3110 }
3111
3112 memset(buf, 0, bytes_alloc);
3113
3114 // Fill buffer
3115 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3116 ::close(fd);
3117 if (bytes_read < 0) {
3118 FREE_C_HEAP_ARRAY(char, buf);
3119 jio_fprintf(defaultStream::error_stream(),
3120 "Could not read options file '%s'\n", file_name);
3121 return JNI_ERR;
3122 }
3123
3124 if (bytes_read == 0) {
3125 // tell caller there is no option data and that is ok
3126 FREE_C_HEAP_ARRAY(char, buf);
3127 return JNI_OK;
3128 }
3129
3130 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3131
3132 FREE_C_HEAP_ARRAY(char, buf);
3133 return retcode;
3134 }
3135
3136 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3137 // Construct option array
3138 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3139
3140 // some pointers to help with parsing
3141 char *buffer_end = buffer + buf_len;
3142 char *opt_hd = buffer;
3143 char *wrt = buffer;
3144 char *rd = buffer;
3145
3146 // parse all options
3147 while (rd < buffer_end) {
3148 // skip leading white space from the input string
3149 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3150 rd++;
3151 }
3152
3153 if (rd >= buffer_end) {
3154 break;
3155 }
3156
3157 // Remember this is where we found the head of the token.
3158 opt_hd = wrt;
3159
3160 // Tokens are strings of non white space characters separated
3161 // by one or more white spaces.
3162 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3163 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3164 int quote = *rd; // matching quote to look for
3165 rd++; // don't copy open quote
3166 while (rd < buffer_end && *rd != quote) {
3167 // include everything (even spaces)
3168 // up until the close quote
3169 *wrt++ = *rd++; // copy to option string
3170 }
3171
3172 if (rd < buffer_end) {
3173 rd++; // don't copy close quote
3174 } else {
3175 // did not see closing quote
3176 jio_fprintf(defaultStream::error_stream(),
3177 "Unmatched quote in %s\n", name);
3178 return JNI_ERR;
3179 }
3180 } else {
3181 *wrt++ = *rd++; // copy to option string
3182 }
3183 }
3184
3185 // steal a white space character and set it to null
3186 *wrt++ = '\0';
3187 // We now have a complete token
3188
3189 JavaVMOption option;
3190 option.optionString = opt_hd;
3191 option.extraInfo = nullptr;
3192
3193 options.append(option); // Fill in option
3194
3195 rd++; // Advance to next character
3196 }
3197
3198 // Fill out JavaVMInitArgs structure.
3199 return vm_args->set_args(&options);
3200 }
3201
3202 #ifndef PRODUCT
3203 // Determine whether LogVMOutput should be implicitly turned on.
3204 static bool use_vm_log() {
3205 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3206 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3207 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3208 PrintAssembly || TraceDeoptimization ||
3209 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3210 return true;
3211 }
3212
3213 #ifdef COMPILER1
3214 if (PrintC1Statistics) {
3215 return true;
3216 }
3217 #endif // COMPILER1
3218
3219 #ifdef COMPILER2
3220 if (PrintOptoAssembly || PrintOptoStatistics) {
3221 return true;
3222 }
3223 #endif // COMPILER2
3224
3225 return false;
3226 }
3227
3228 #endif // PRODUCT
3229
3230 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3231 for (int index = 0; index < args->nOptions; index++) {
3232 const JavaVMOption* option = args->options + index;
3233 const char* tail;
3234 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3235 return true;
3236 }
3237 }
3238 return false;
3239 }
3240
3241 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3242 const char* vm_options_file,
3243 const int vm_options_file_pos,
3244 ScopedVMInitArgs* vm_options_file_args,
3245 ScopedVMInitArgs* args_out) {
3246 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3247 if (code != JNI_OK) {
3248 return code;
3249 }
3250
3251 if (vm_options_file_args->get()->nOptions < 1) {
3252 return JNI_OK;
3253 }
3254
3255 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3256 jio_fprintf(defaultStream::error_stream(),
3257 "A VM options file may not refer to a VM options file. "
3258 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3259 "options file '%s' in options container '%s' is an error.\n",
3260 vm_options_file_args->vm_options_file_arg(),
3261 vm_options_file_args->container_name());
3262 return JNI_EINVAL;
3263 }
3264
3265 return args_out->insert(args, vm_options_file_args->get(),
3266 vm_options_file_pos);
3267 }
3268
3269 // Expand -XX:VMOptionsFile found in args_in as needed.
3270 // mod_args and args_out parameters may return values as needed.
3271 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3272 ScopedVMInitArgs* mod_args,
3273 JavaVMInitArgs** args_out) {
3274 jint code = match_special_option_and_act(args_in, mod_args);
3275 if (code != JNI_OK) {
3276 return code;
3277 }
3278
3279 if (mod_args->is_set()) {
3280 // args_in contains -XX:VMOptionsFile and mod_args contains the
3281 // original options from args_in along with the options expanded
3282 // from the VMOptionsFile. Return a short-hand to the caller.
3283 *args_out = mod_args->get();
3284 } else {
3285 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3286 }
3287 return JNI_OK;
3288 }
3289
3290 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3291 ScopedVMInitArgs* args_out) {
3292 // Remaining part of option string
3293 const char* tail;
3294 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3295
3296 for (int index = 0; index < args->nOptions; index++) {
3297 const JavaVMOption* option = args->options + index;
3298 if (match_option(option, "-XX:Flags=", &tail)) {
3299 Arguments::set_jvm_flags_file(tail);
3300 continue;
3301 }
3302 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3303 if (vm_options_file_args.found_vm_options_file_arg()) {
3304 jio_fprintf(defaultStream::error_stream(),
3305 "The option '%s' is already specified in the options "
3306 "container '%s' so the specification of '%s' in the "
3307 "same options container is an error.\n",
3308 vm_options_file_args.vm_options_file_arg(),
3309 vm_options_file_args.container_name(),
3310 option->optionString);
3311 return JNI_EINVAL;
3312 }
3313 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3314 // If there's a VMOptionsFile, parse that
3315 jint code = insert_vm_options_file(args, tail, index,
3316 &vm_options_file_args, args_out);
3317 if (code != JNI_OK) {
3318 return code;
3319 }
3320 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3321 if (args_out->is_set()) {
3322 // The VMOptions file inserted some options so switch 'args'
3323 // to the new set of options, and continue processing which
3324 // preserves "last option wins" semantics.
3325 args = args_out->get();
3326 // The first option from the VMOptionsFile replaces the
3327 // current option. So we back track to process the
3328 // replacement option.
3329 index--;
3330 }
3331 continue;
3332 }
3333 if (match_option(option, "-XX:+PrintVMOptions")) {
3334 PrintVMOptions = true;
3335 continue;
3336 }
3337 if (match_option(option, "-XX:-PrintVMOptions")) {
3338 PrintVMOptions = false;
3339 continue;
3340 }
3341 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3342 IgnoreUnrecognizedVMOptions = true;
3343 continue;
3344 }
3345 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3346 IgnoreUnrecognizedVMOptions = false;
3347 continue;
3348 }
3349 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3350 JVMFlag::printFlags(tty, false);
3351 vm_exit(0);
3352 }
3353
3354 #ifndef PRODUCT
3355 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3356 JVMFlag::printFlags(tty, true);
3357 vm_exit(0);
3358 }
3359 #endif
3360 }
3361 return JNI_OK;
3362 }
3363
3364 static void print_options(const JavaVMInitArgs *args) {
3365 const char* tail;
3366 for (int index = 0; index < args->nOptions; index++) {
3367 const JavaVMOption *option = args->options + index;
3368 if (match_option(option, "-XX:", &tail)) {
3369 logOption(tail);
3370 }
3371 }
3372 }
3373
3374 bool Arguments::handle_deprecated_print_gc_flags() {
3375 if (PrintGC) {
3376 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3377 }
3378 if (PrintGCDetails) {
3379 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3380 }
3381
3382 if (_legacyGCLogging.lastFlag == 2) {
3383 // -Xloggc was used to specify a filename
3384 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3385
3386 LogTarget(Error, logging) target;
3387 LogStream errstream(target);
3388 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3389 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3390 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3391 }
3392 return true;
3393 }
3394
3395 static void apply_debugger_ergo() {
3396 #ifdef ASSERT
3397 if (ReplayCompiles) {
3398 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3399 }
3400
3401 if (UseDebuggerErgo) {
3402 // Turn on sub-flags
3403 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3404 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3405 }
3406
3407 if (UseDebuggerErgo2) {
3408 // Debugging with limited number of CPUs
3409 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3410 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3411 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3412 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3413 }
3414 #endif // ASSERT
3415 }
3416
3417 // Parse entry point called from JNI_CreateJavaVM
3418
3419 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3420 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3421 JVMFlag::check_all_flag_declarations();
3422
3423 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3424 const char* hotspotrc = ".hotspotrc";
3425 bool settings_file_specified = false;
3426 bool needs_hotspotrc_warning = false;
3427 ScopedVMInitArgs initial_vm_options_args("");
3428 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3429 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3430
3431 // Pointers to current working set of containers
3432 JavaVMInitArgs* cur_cmd_args;
3433 JavaVMInitArgs* cur_vm_options_args;
3434 JavaVMInitArgs* cur_java_options_args;
3435 JavaVMInitArgs* cur_java_tool_options_args;
3436
3437 // Containers for modified/expanded options
3438 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3439 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3440 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3441 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3442
3443
3444 jint code =
3445 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3446 if (code != JNI_OK) {
3447 return code;
3448 }
3449
3450 code = parse_java_options_environment_variable(&initial_java_options_args);
3451 if (code != JNI_OK) {
3452 return code;
3453 }
3454
3455 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3456 char *vmoptions = ClassLoader::lookup_vm_options();
3457 if (vmoptions != nullptr) {
3458 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3459 FREE_C_HEAP_ARRAY(char, vmoptions);
3460 if (code != JNI_OK) {
3461 return code;
3462 }
3463 }
3464
3465 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3466 &mod_java_tool_options_args,
3467 &cur_java_tool_options_args);
3468 if (code != JNI_OK) {
3469 return code;
3470 }
3471
3472 code = expand_vm_options_as_needed(initial_cmd_args,
3473 &mod_cmd_args,
3474 &cur_cmd_args);
3475 if (code != JNI_OK) {
3476 return code;
3477 }
3478
3479 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3480 &mod_java_options_args,
3481 &cur_java_options_args);
3482 if (code != JNI_OK) {
3483 return code;
3484 }
3485
3486 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3487 &mod_vm_options_args,
3488 &cur_vm_options_args);
3489 if (code != JNI_OK) {
3490 return code;
3491 }
3492
3493 const char* flags_file = Arguments::get_jvm_flags_file();
3494 settings_file_specified = (flags_file != nullptr);
3495
3496 if (IgnoreUnrecognizedVMOptions) {
3497 cur_cmd_args->ignoreUnrecognized = true;
3498 cur_java_tool_options_args->ignoreUnrecognized = true;
3499 cur_java_options_args->ignoreUnrecognized = true;
3500 }
3501
3502 // Parse specified settings file
3503 if (settings_file_specified) {
3504 if (!process_settings_file(flags_file, true,
3505 cur_cmd_args->ignoreUnrecognized)) {
3506 return JNI_EINVAL;
3507 }
3508 } else {
3509 #ifdef ASSERT
3510 // Parse default .hotspotrc settings file
3511 if (!process_settings_file(".hotspotrc", false,
3512 cur_cmd_args->ignoreUnrecognized)) {
3513 return JNI_EINVAL;
3514 }
3515 #else
3516 struct stat buf;
3517 if (os::stat(hotspotrc, &buf) == 0) {
3518 needs_hotspotrc_warning = true;
3519 }
3520 #endif
3521 }
3522
3523 if (PrintVMOptions) {
3524 print_options(cur_java_tool_options_args);
3525 print_options(cur_cmd_args);
3526 print_options(cur_java_options_args);
3527 }
3528
3529 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3530 jint result = parse_vm_init_args(cur_vm_options_args,
3531 cur_java_tool_options_args,
3532 cur_java_options_args,
3533 cur_cmd_args);
3534
3535 if (result != JNI_OK) {
3536 return result;
3537 }
3538
3539 // Delay warning until here so that we've had a chance to process
3540 // the -XX:-PrintWarnings flag
3541 if (needs_hotspotrc_warning) {
3542 warning("%s file is present but has been ignored. "
3543 "Run with -XX:Flags=%s to load the file.",
3544 hotspotrc, hotspotrc);
3545 }
3546
3547 if (needs_module_property_warning) {
3548 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3549 " names that are reserved for internal use.");
3550 }
3551
3552 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3553 UNSUPPORTED_OPTION(UseLargePages);
3554 #endif
3555
3556 #if defined(AIX)
3557 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3558 #endif
3559
3560 #ifndef PRODUCT
3561 if (TraceBytecodesAt != 0) {
3562 TraceBytecodes = true;
3563 }
3564 #endif // PRODUCT
3565
3566 if (ScavengeRootsInCode == 0) {
3567 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3568 warning("Forcing ScavengeRootsInCode non-zero");
3569 }
3570 ScavengeRootsInCode = 1;
3571 }
3572
3573 if (!handle_deprecated_print_gc_flags()) {
3574 return JNI_EINVAL;
3575 }
3576
3577 // Set object alignment values.
3578 set_object_alignment();
3579
3580 #if !INCLUDE_CDS
3581 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3582 jio_fprintf(defaultStream::error_stream(),
3583 "Shared spaces are not supported in this VM\n");
3584 return JNI_ERR;
3585 }
3586 if (DumpLoadedClassList != nullptr) {
3587 jio_fprintf(defaultStream::error_stream(),
3588 "DumpLoadedClassList is not supported in this VM\n");
3589 return JNI_ERR;
3590 }
3591 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3592 log_is_enabled(Info, cds)) {
3593 warning("Shared spaces are not supported in this VM");
3594 UseSharedSpaces = false;
3595 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3596 }
3597 no_shared_spaces("CDS Disabled");
3598 #endif // INCLUDE_CDS
3599
3600 // Verify NMT arguments
3601 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3602 if (lvl == NMT_unknown) {
3603 jio_fprintf(defaultStream::error_stream(),
3604 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3605 return JNI_ERR;
3606 }
3607 if (PrintNMTStatistics && lvl == NMT_off) {
3608 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3609 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3610 }
3611
3612 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3613 if (trace_dependencies && VerifyDependencies) {
3614 warning("dependency logging results may be inflated by VerifyDependencies");
3615 }
3616
3617 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3618 log_is_enabled(Info, class, load, cause);
3619 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3620 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3621 }
3622
3623 apply_debugger_ergo();
3624
3625 // The VMThread needs to stop now and then to execute these debug options.
3626 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3627 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3628 }
3629
3630 if (log_is_enabled(Info, arguments)) {
3631 LogStream st(Log(arguments)::info());
3632 Arguments::print_on(&st);
3633 }
3634
3635 return JNI_OK;
3636 }
3637
3638 jint Arguments::apply_ergo() {
3639 // Set flags based on ergonomics.
3640 jint result = set_ergonomics_flags();
3641 if (result != JNI_OK) return result;
3642
3643 // Set heap size based on available physical memory
3644 set_heap_size();
3645
3646 GCConfig::arguments()->initialize();
3647
3648 CDSConfig::initialize();
3649
3650 // Initialize Metaspace flags and alignments
3651 Metaspace::ergo_initialize();
3652
3653 if (!StringDedup::ergo_initialize()) {
3654 return JNI_EINVAL;
3655 }
3656
3657 // Set compiler flags after GC is selected and GC specific
3658 // flags (LoopStripMiningIter) are set.
3659 CompilerConfig::ergo_initialize();
3660
3661 // Set bytecode rewriting flags
3662 set_bytecode_flags();
3663
3664 // Set flags if aggressive optimization flags are enabled
3665 jint code = set_aggressive_opts_flags();
3666 if (code != JNI_OK) {
3667 return code;
3668 }
3669
3670 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3671 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3672 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3673 warning("UseSecondarySupersTable is not supported");
3674 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3675 }
3676 if (!UseSecondarySupersTable) {
3677 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3678 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3679 }
3680
3681 #ifdef ZERO
3682 // Clear flags not supported on zero.
3683 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3684 #endif // ZERO
3685
3686 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3687 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3688 DebugNonSafepoints = true;
3689 }
3690
3691 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3692 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3693 }
3694
3695 // Treat the odd case where local verification is enabled but remote
3696 // verification is not as if both were enabled.
3697 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3698 log_info(verification)("Turning on remote verification because local verification is on");
3699 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3700 }
3701
3702 #ifndef PRODUCT
3703 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3704 if (use_vm_log()) {
3705 LogVMOutput = true;
3706 }
3707 }
3708 #endif // PRODUCT
3709
3710 if (PrintCommandLineFlags) {
3711 JVMFlag::printSetFlags(tty);
3712 }
3713
3714 #if COMPILER2_OR_JVMCI
3715 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3716 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3717 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3718 }
3719 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3720
3721 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3722 if (!EnableVectorReboxing) {
3723 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3724 } else {
3725 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3726 }
3727 }
3728 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3729
3730 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3731 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3732 }
3733 FLAG_SET_DEFAULT(UseVectorStubs, false);
3734 }
3735 #endif // COMPILER2_OR_JVMCI
3736
3737 if (log_is_enabled(Info, perf, class, link)) {
3738 if (!UsePerfData) {
3739 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3740 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3741 }
3742 }
3743
3744 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3745 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3746 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3747 }
3748 }
3749 return JNI_OK;
3750 }
3751
3752 jint Arguments::adjust_after_os() {
3753 if (UseNUMA) {
3754 if (UseParallelGC) {
3755 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3756 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3757 }
3758 }
3759 }
3760 return JNI_OK;
3761 }
3762
3763 int Arguments::PropertyList_count(SystemProperty* pl) {
3764 int count = 0;
3765 while(pl != nullptr) {
3766 count++;
3767 pl = pl->next();
3768 }
3769 return count;
3770 }
3771
3772 // Return the number of readable properties.
3773 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3774 int count = 0;
3775 while(pl != nullptr) {
3776 if (pl->readable()) {
3777 count++;
3778 }
3779 pl = pl->next();
3780 }
3781 return count;
3782 }
3783
3784 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3785 assert(key != nullptr, "just checking");
3786 SystemProperty* prop;
3787 for (prop = pl; prop != nullptr; prop = prop->next()) {
3788 if (strcmp(key, prop->key()) == 0) return prop->value();
3789 }
3790 return nullptr;
3791 }
3792
3793 // Return the value of the requested property provided that it is a readable property.
3794 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3795 assert(key != nullptr, "just checking");
3796 SystemProperty* prop;
3797 // Return the property value if the keys match and the property is not internal or
3798 // it's the special internal property "jdk.boot.class.path.append".
3799 for (prop = pl; prop != nullptr; prop = prop->next()) {
3800 if (strcmp(key, prop->key()) == 0) {
3801 if (!prop->internal()) {
3802 return prop->value();
3803 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3804 return prop->value();
3805 } else {
3806 // Property is internal and not jdk.boot.class.path.append so return null.
3807 return nullptr;
3808 }
3809 }
3810 }
3811 return nullptr;
3812 }
3813
3814 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3815 SystemProperty* p = *plist;
3816 if (p == nullptr) {
3817 *plist = new_p;
3818 } else {
3819 while (p->next() != nullptr) {
3820 p = p->next();
3821 }
3822 p->set_next(new_p);
3823 }
3824 }
3825
3826 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3827 bool writeable, bool internal) {
3828 if (plist == nullptr)
3829 return;
3830
3831 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3832 PropertyList_add(plist, new_p);
3833 }
3834
3835 void Arguments::PropertyList_add(SystemProperty *element) {
3836 PropertyList_add(&_system_properties, element);
3837 }
3838
3839 // This add maintains unique property key in the list.
3840 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3841 PropertyAppendable append, PropertyWriteable writeable,
3842 PropertyInternal internal) {
3843 if (plist == nullptr)
3844 return;
3845
3846 // If property key exists and is writeable, then update with new value.
3847 // Trying to update a non-writeable property is silently ignored.
3848 SystemProperty* prop;
3849 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3850 if (strcmp(k, prop->key()) == 0) {
3851 if (append == AppendProperty) {
3852 prop->append_writeable_value(v);
3853 } else {
3854 prop->set_writeable_value(v);
3855 }
3856 return;
3857 }
3858 }
3859
3860 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3861 }
3862
3863 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3864 // Returns true if all of the source pointed by src has been copied over to
3865 // the destination buffer pointed by buf. Otherwise, returns false.
3866 // Notes:
3867 // 1. If the length (buflen) of the destination buffer excluding the
3868 // null terminator character is not long enough for holding the expanded
3869 // pid characters, it also returns false instead of returning the partially
3870 // expanded one.
3871 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3872 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3873 char* buf, size_t buflen) {
3874 const char* p = src;
3875 char* b = buf;
3876 const char* src_end = &src[srclen];
3877 char* buf_end = &buf[buflen - 1];
3878
3879 while (p < src_end && b < buf_end) {
3880 if (*p == '%') {
3881 switch (*(++p)) {
3882 case '%': // "%%" ==> "%"
3883 *b++ = *p++;
3884 break;
3885 case 'p': { // "%p" ==> current process id
3886 // buf_end points to the character before the last character so
3887 // that we could write '\0' to the end of the buffer.
3888 size_t buf_sz = buf_end - b + 1;
3889 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3890
3891 // if jio_snprintf fails or the buffer is not long enough to hold
3892 // the expanded pid, returns false.
3893 if (ret < 0 || ret >= (int)buf_sz) {
3894 return false;
3895 } else {
3896 b += ret;
3897 assert(*b == '\0', "fail in copy_expand_pid");
3898 if (p == src_end && b == buf_end + 1) {
3899 // reach the end of the buffer.
3900 return true;
3901 }
3902 }
3903 p++;
3904 break;
3905 }
3906 default :
3907 *b++ = '%';
3908 }
3909 } else {
3910 *b++ = *p++;
3911 }
3912 }
3913 *b = '\0';
3914 return (p == src_end); // return false if not all of the source was copied
3915 }