1 /*
2 * Copyright (c) 1997, 2020, 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 "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/gcConfig.hpp"
34 #include "logging/log.hpp"
35 #include "logging/logConfiguration.hpp"
36 #include "logging/logStream.hpp"
37 #include "logging/logTag.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/flags/jvmFlag.hpp"
44 #include "runtime/flags/jvmFlagConstraintList.hpp"
45 #include "runtime/flags/jvmFlagRangeList.hpp"
46 #include "runtime/globals_extension.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/os.inline.hpp"
49 #include "runtime/safepoint.hpp"
50 #include "runtime/safepointMechanism.hpp"
51 #include "runtime/vm_version.hpp"
52 #include "services/management.hpp"
53 #include "services/memTracker.hpp"
54 #include "utilities/align.hpp"
55 #include "utilities/defaultStream.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/powerOfTwo.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JFR
60 #include "jfr/jfr.hpp"
61 #endif
62
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
65 char* Arguments::_jvm_flags_file = NULL;
66 char** Arguments::_jvm_flags_array = NULL;
67 int Arguments::_num_jvm_flags = 0;
68 char** Arguments::_jvm_args_array = NULL;
69 int Arguments::_num_jvm_args = 0;
70 char* Arguments::_java_command = NULL;
71 SystemProperty* Arguments::_system_properties = NULL;
72 const char* Arguments::_gc_log_filename = NULL;
73 size_t Arguments::_conservative_max_heap_alignment = 0;
74 Arguments::Mode Arguments::_mode = _mixed;
75 bool Arguments::_java_compiler = false;
76 bool Arguments::_xdebug_mode = false;
77 const char* Arguments::_java_vendor_url_bug = NULL;
78 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
79 bool Arguments::_sun_java_launcher_is_altjvm = false;
80
81 // These parameters are reset in method parse_vm_init_args()
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
87 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
88 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
89
90 bool Arguments::_enable_preview = false;
91
92 char* Arguments::SharedArchivePath = NULL;
93 char* Arguments::SharedDynamicArchivePath = NULL;
94
95 AgentLibraryList Arguments::_libraryList;
96 AgentLibraryList Arguments::_agentList;
97
98 // These are not set by the JDK's built-in launchers, but they can be set by
99 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
100 // JavaVMOption in jni.h.
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
111 SystemProperty *Arguments::_vm_info = NULL;
112
113 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
114 PathString *Arguments::_system_boot_class_path = NULL;
115 bool Arguments::_has_jimage = false;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 bool PathString::set_value(const char *value) {
120 if (_value != NULL) {
121 FreeHeap(_value);
122 }
123 _value = AllocateHeap(strlen(value)+1, mtArguments);
124 assert(_value != NULL, "Unable to allocate space for new path value");
125 if (_value != NULL) {
126 strcpy(_value, value);
127 } else {
128 // not able to allocate
129 return false;
130 }
131 return true;
132 }
133
134 void PathString::append_value(const char *value) {
135 char *sp;
136 size_t len = 0;
137 if (value != NULL) {
138 len = strlen(value);
139 if (_value != NULL) {
140 len += strlen(_value);
141 }
142 sp = AllocateHeap(len+2, mtArguments);
143 assert(sp != NULL, "Unable to allocate space for new append path value");
144 if (sp != NULL) {
145 if (_value != NULL) {
146 strcpy(sp, _value);
147 strcat(sp, os::path_separator());
148 strcat(sp, value);
149 FreeHeap(_value);
150 } else {
151 strcpy(sp, value);
152 }
153 _value = sp;
154 }
155 }
156 }
157
158 PathString::PathString(const char* value) {
159 if (value == NULL) {
160 _value = NULL;
161 } else {
162 _value = AllocateHeap(strlen(value)+1, mtArguments);
163 strcpy(_value, value);
164 }
165 }
166
167 PathString::~PathString() {
168 if (_value != NULL) {
169 FreeHeap(_value);
170 _value = NULL;
171 }
172 }
173
174 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
175 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
176 size_t len = strlen(module_name) + 1;
177 _module_name = AllocateHeap(len, mtInternal);
178 strncpy(_module_name, module_name, len); // copy the trailing null
179 _path = new PathString(path);
180 }
181
182 ModulePatchPath::~ModulePatchPath() {
183 if (_module_name != NULL) {
184 FreeHeap(_module_name);
185 _module_name = NULL;
186 }
187 if (_path != NULL) {
188 delete _path;
189 _path = NULL;
190 }
191 }
192
193 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
194 if (key == NULL) {
195 _key = NULL;
196 } else {
197 _key = AllocateHeap(strlen(key)+1, mtArguments);
198 strcpy(_key, key);
199 }
200 _next = NULL;
201 _internal = internal;
202 _writeable = writeable;
203 }
204
205 AgentLibrary::AgentLibrary(const char* name, const char* options,
206 bool is_absolute_path, void* os_lib,
207 bool instrument_lib) {
208 _name = AllocateHeap(strlen(name)+1, mtArguments);
209 strcpy(_name, name);
210 if (options == NULL) {
211 _options = NULL;
212 } else {
213 _options = AllocateHeap(strlen(options)+1, mtArguments);
214 strcpy(_options, options);
215 }
216 _is_absolute_path = is_absolute_path;
217 _os_lib = os_lib;
218 _next = NULL;
219 _state = agent_invalid;
220 _is_static_lib = false;
221 _is_instrument_lib = instrument_lib;
222 }
223
224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
225 // part of the option string.
226 static bool match_option(const JavaVMOption *option, const char* name,
227 const char** tail) {
228 size_t len = strlen(name);
229 if (strncmp(option->optionString, name, len) == 0) {
230 *tail = option->optionString + len;
231 return true;
232 } else {
233 return false;
234 }
235 }
236
237 // Check if 'option' matches 'name'. No "tail" is allowed.
238 static bool match_option(const JavaVMOption *option, const char* name) {
239 const char* tail = NULL;
240 bool result = match_option(option, name, &tail);
241 if (tail != NULL && *tail == '\0') {
242 return result;
243 } else {
244 return false;
245 }
246 }
247
248 // Return true if any of the strings in null-terminated array 'names' matches.
249 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
250 // the option must match exactly.
251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
252 bool tail_allowed) {
253 for (/* empty */; *names != NULL; ++names) {
254 if (match_option(option, *names, tail)) {
255 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
256 return true;
257 }
258 }
259 }
260 return false;
261 }
262
263 #if INCLUDE_JFR
264 static bool _has_jfr_option = false; // is using JFR
265
266 // return true on failure
267 static bool match_jfr_option(const JavaVMOption** option) {
268 assert((*option)->optionString != NULL, "invariant");
269 char* tail = NULL;
270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_start_flight_recording_option(option, tail);
273 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_flight_recorder_option(option, tail);
276 }
277 return false;
278 }
279
280 bool Arguments::has_jfr_option() {
281 return _has_jfr_option;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311
312 void Arguments::add_init_library(const char* name, char* options) {
313 _libraryList.add(new AgentLibrary(name, options, false, NULL));
314 }
315
316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
318 }
319
320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
322 }
323
324 // Late-binding agents not started via arguments
325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
326 _agentList.add(agentLib);
327 }
328
329 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
330 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
331 return ((strncmp(option, property, len) == 0) &&
332 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
333 }
334
335 // Return true if property starts with "jdk.module." and its ensuing chars match
336 // any of the reserved module properties.
337 // property should be passed without the leading "-D".
338 bool Arguments::is_internal_module_property(const char* property) {
339 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
340 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
341 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
342 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
343 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
344 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
345 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
346 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
347 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
348 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
349 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
350 return true;
351 }
352 }
353 return false;
354 }
355
356 // Process java launcher properties.
357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
358 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
359 // Must do this before setting up other system properties,
360 // as some of them may depend on launcher type.
361 for (int index = 0; index < args->nOptions; index++) {
362 const JavaVMOption* option = args->options + index;
363 const char* tail;
364
365 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
366 process_java_launcher_argument(tail, option->extraInfo);
367 continue;
368 }
369 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
370 if (strcmp(tail, "true") == 0) {
371 _sun_java_launcher_is_altjvm = true;
372 }
373 continue;
374 }
375 }
376 }
377
378 // Initialize system properties key and value.
379 void Arguments::init_system_properties() {
380
381 // Set up _system_boot_class_path which is not a property but
382 // relies heavily on argument processing and the jdk.boot.class.path.append
383 // property. It is used to store the underlying system boot class path.
384 _system_boot_class_path = new PathString(NULL);
385
386 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
387 "Java Virtual Machine Specification", false));
388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
390 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
391
392 // Initialize the vm.info now, but it will need updating after argument parsing.
393 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
394
395 // Following are JVMTI agent writable properties.
396 // Properties values are set to NULL and they are
397 // os specific they are initialized in os::init_system_properties_values().
398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
399 _java_library_path = new SystemProperty("java.library.path", NULL, true);
400 _java_home = new SystemProperty("java.home", NULL, true);
401 _java_class_path = new SystemProperty("java.class.path", "", true);
402 // jdk.boot.class.path.append is a non-writeable, internal property.
403 // It can only be set by either:
404 // - -Xbootclasspath/a:
405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
407
408 // Add to System Property list.
409 PropertyList_add(&_system_properties, _sun_boot_library_path);
410 PropertyList_add(&_system_properties, _java_library_path);
411 PropertyList_add(&_system_properties, _java_home);
412 PropertyList_add(&_system_properties, _java_class_path);
413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
414 PropertyList_add(&_system_properties, _vm_info);
415
416 // Set OS specific system properties values
417 os::init_system_properties_values();
418 }
419
420 // Update/Initialize System properties after JDK version number is known
421 void Arguments::init_version_specific_system_properties() {
422 enum { bufsz = 16 };
423 char buffer[bufsz];
424 const char* spec_vendor = "Oracle Corporation";
425 uint32_t spec_version = JDK_Version::current().major_version();
426
427 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
428
429 PropertyList_add(&_system_properties,
430 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
431 PropertyList_add(&_system_properties,
432 new SystemProperty("java.vm.specification.version", buffer, false));
433 PropertyList_add(&_system_properties,
434 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
435 }
436
437 /*
438 * -XX argument processing:
439 *
440 * -XX arguments are defined in several places, such as:
441 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
442 * -XX arguments are parsed in parse_argument().
443 * -XX argument bounds checking is done in check_vm_args_consistency().
444 *
445 * Over time -XX arguments may change. There are mechanisms to handle common cases:
446 *
447 * ALIASED: An option that is simply another name for another option. This is often
448 * part of the process of deprecating a flag, but not all aliases need
449 * to be deprecated.
450 *
451 * Create an alias for an option by adding the old and new option names to the
452 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
453 *
454 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
455 * support may be removed in the future. Both regular and aliased options may be
456 * deprecated.
457 *
458 * Add a deprecation warning for an option (or alias) by adding an entry in the
459 * "special_jvm_flags" table and setting the "deprecated_in" field.
460 * Often an option "deprecated" in one major release will
461 * be made "obsolete" in the next. In this case the entry should also have its
462 * "obsolete_in" field set.
463 *
464 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
465 * on the command line. A warning is printed to let the user know that option might not
466 * be accepted in the future.
467 *
468 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
469 * table and setting the "obsolete_in" field.
470 *
471 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
472 * to the current JDK version. The system will flatly refuse to admit the existence of
473 * the flag. This allows a flag to die automatically over JDK releases.
474 *
475 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
476 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
477 * - Newly obsolete or expired deprecated options should have their global variable
478 * definitions removed (from globals.hpp, etc) and related implementations removed.
479 *
480 * Recommended approach for removing options:
481 *
482 * To remove options commonly used by customers (e.g. product -XX options), use
483 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
484 *
485 * To remove internal options (e.g. diagnostic, experimental, develop options), use
486 * a 2-step model adding major release numbers to the obsolete and expire columns.
487 *
488 * To change the name of an option, use the alias table as well as a 2-step
489 * model adding major release numbers to the deprecate and expire columns.
490 * Think twice about aliasing commonly used customer options.
491 *
492 * There are times when it is appropriate to leave a future release number as undefined.
493 *
494 * Tests: Aliases should be tested in VMAliasOptions.java.
495 * Deprecated options should be tested in VMDeprecatedOptions.java.
496 */
497
498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
501 // the command-line as usual, but will issue a warning.
502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
503 // the command-line, while issuing a warning and ignoring the flag value.
504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
505 // existence of the flag.
506 //
507 // MANUAL CLEANUP ON JDK VERSION UPDATES:
508 // This table ensures that the handling of options will update automatically when the JDK
509 // version is incremented, but the source code needs to be cleanup up manually:
510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
511 // variable should be removed, as well as users of the variable.
512 // - As "deprecated" options age into "obsolete" options, move the entry into the
513 // "Obsolete Flags" section of the table.
514 // - All expired options should be removed from the table.
515 static SpecialFlag const special_jvm_flags[] = {
516 // -------------- Deprecated Flags --------------
517 // --- Non-alias flags - sorted by obsolete_in then expired_in:
518 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
519 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
520 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
521 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
522 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
523 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
524 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
525 { "UseBiasedLocking", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
526 { "BiasedLockingStartupDelay", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
527 { "PrintBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
528 { "BiasedLockingBulkRebiasThreshold", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
529 { "BiasedLockingBulkRevokeThreshold", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
530 { "BiasedLockingDecayTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
531 { "UseOptoBiasInlining", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
532 { "PrintPreciseBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
533 { "InitialBootClassLoaderMetaspaceSize", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
534 { "UseLargePagesInMetaspace", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
535
536 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
537 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
538 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
539 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
540
541 // -------------- Obsolete Flags - sorted by expired_in --------------
542 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
543 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
544 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
545 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
546 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
547 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
548 #ifdef BSD
549 { "UseBsdPosixThreadCPUClocks", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
550 { "UseOprofile", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
551 #endif
552 { "PrintVMQWaitTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
553 { "UseNewFieldLayout", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
554 { "UseSemaphoreGCThreadsSynchronization", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
555 { "ForceNUMA", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
556
557 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
558 // These entries will generate build errors. Their purpose is to test the macros.
559 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
560 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
561 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
562 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
563 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
564 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
565 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
566 #endif
567
568 #ifndef COMPILER2
569 // These flags were generally available, but are C2 only, now.
570 { "MaxInlineLevel", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
571 { "MaxRecursiveInlineLevel", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
572 { "InlineSmallCode", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
573 { "MaxInlineSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
574 { "FreqInlineSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
575 { "MaxTrivialSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
576 #endif
577
578 { NULL, JDK_Version(0), JDK_Version(0) }
579 };
580
581 // Flags that are aliases for other flags.
582 typedef struct {
583 const char* alias_name;
584 const char* real_name;
585 } AliasedFlag;
586
587 static AliasedFlag const aliased_jvm_flags[] = {
588 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
589 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
590 { NULL, NULL}
591 };
592
593 // NOTE: A compatibility request will be necessary for each alias to be removed.
594 static AliasedLoggingFlag const aliased_logging_flags[] = {
595 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
596 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
597 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
598 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
599 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
600 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
601 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
602 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
603 { "TraceInvokeDynamic", LogLevel::Debug, true, LOG_TAGS(methodhandles, indy) },
604 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
605 { "TraceMethodHandles", LogLevel::Info, true, LOG_TAGS(methodhandles) },
606 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
607 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
608 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
609 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
610 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) },
611 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
612 };
613
614 #ifndef PRODUCT
615 // These options are removed in jdk9. Remove this code for jdk10.
616 static AliasedFlag const removed_develop_logging_flags[] = {
617 { "TraceClassInitialization", "-Xlog:class+init" },
618 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
619 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
620 { "TraceItables", "-Xlog:itables=debug" },
621 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
622 { "TraceSafepoint", "-Xlog:safepoint=debug" },
623 { "TraceStartupTime", "-Xlog:startuptime" },
624 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
625 { "PrintVtables", "-Xlog:vtables=debug" },
626 { "VerboseVerification", "-Xlog:verification" },
627 { NULL, NULL }
628 };
629 #endif //PRODUCT
630
631 // Return true if "v" is less than "other", where "other" may be "undefined".
632 static bool version_less_than(JDK_Version v, JDK_Version other) {
633 assert(!v.is_undefined(), "must be defined");
634 if (!other.is_undefined() && v.compare(other) >= 0) {
635 return false;
636 } else {
637 return true;
638 }
639 }
640
641 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
642 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
643 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
644 flag = special_jvm_flags[i];
645 return true;
646 }
647 }
648 return false;
649 }
650
651 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
652 assert(version != NULL, "Must provide a version buffer");
653 SpecialFlag flag;
654 if (lookup_special_flag(flag_name, flag)) {
655 if (!flag.obsolete_in.is_undefined()) {
656 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
657 *version = flag.obsolete_in;
658 // This flag may have been marked for obsoletion in this version, but we may not
659 // have actually removed it yet. Rather than ignoring it as soon as we reach
660 // this version we allow some time for the removal to happen. So if the flag
661 // still actually exists we process it as normal, but issue an adjusted warning.
662 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
663 if (real_flag != NULL) {
664 char version_str[256];
665 version->to_string(version_str, sizeof(version_str));
666 warning("Temporarily processing option %s; support is scheduled for removal in %s",
667 flag_name, version_str);
668 return false;
669 }
670 return true;
671 }
672 }
673 }
674 return false;
675 }
676
677 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
678 assert(version != NULL, "Must provide a version buffer");
679 SpecialFlag flag;
680 if (lookup_special_flag(flag_name, flag)) {
681 if (!flag.deprecated_in.is_undefined()) {
682 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
683 version_less_than(JDK_Version::current(), flag.expired_in)) {
684 *version = flag.deprecated_in;
685 return 1;
686 } else {
687 return -1;
688 }
689 }
690 }
691 return 0;
692 }
693
694 #ifndef PRODUCT
695 const char* Arguments::removed_develop_logging_flag_name(const char* name){
696 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
697 const AliasedFlag& flag = removed_develop_logging_flags[i];
698 if (strcmp(flag.alias_name, name) == 0) {
699 return flag.real_name;
700 }
701 }
702 return NULL;
703 }
704 #endif // PRODUCT
705
706 const char* Arguments::real_flag_name(const char *flag_name) {
707 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
708 const AliasedFlag& flag_status = aliased_jvm_flags[i];
709 if (strcmp(flag_status.alias_name, flag_name) == 0) {
710 return flag_status.real_name;
711 }
712 }
713 return flag_name;
714 }
715
716 #ifdef ASSERT
717 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
718 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
719 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
720 return true;
721 }
722 }
723 return false;
724 }
725
726 // Verifies the correctness of the entries in the special_jvm_flags table.
727 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
728 // version being earlier than the deprecation version, then a warning is issued
729 // and verification fails - by returning false. If it is detected that the table
730 // is out of date, with respect to the current version, then ideally a warning is
731 // issued but verification does not fail. This allows the VM to operate when the
732 // version is first updated, without needing to update all the impacted flags at
733 // the same time. In practice we can't issue the warning immediately when the version
734 // is updated as it occurs for every test and some tests are not prepared to handle
735 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
736 // if the check_globals flag is true, and in addition allow a grace period and only
737 // check for stale flags when we hit build 25 (which is far enough into the 6 month
738 // release cycle that all flag updates should have been processed, whilst still
739 // leaving time to make the change before RDP2).
740 // We use a gtest to call this, passing true, so that we can detect stale flags before
741 // the end of the release cycle.
742
743 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
744
745 bool Arguments::verify_special_jvm_flags(bool check_globals) {
746 bool success = true;
747 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
748 const SpecialFlag& flag = special_jvm_flags[i];
749 if (lookup_special_flag(flag.name, i)) {
750 warning("Duplicate special flag declaration \"%s\"", flag.name);
751 success = false;
752 }
753 if (flag.deprecated_in.is_undefined() &&
754 flag.obsolete_in.is_undefined()) {
755 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
756 success = false;
757 }
758
759 if (!flag.deprecated_in.is_undefined()) {
760 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
761 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
762 success = false;
763 }
764
765 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
766 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
767 success = false;
768 }
769 }
770
771 if (!flag.obsolete_in.is_undefined()) {
772 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
773 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
774 success = false;
775 }
776
777 // if flag has become obsolete it should not have a "globals" flag defined anymore.
778 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
779 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
780 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
781 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
782 success = false;
783 }
784 }
785
786 } else if (!flag.expired_in.is_undefined()) {
787 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
788 success = false;
789 }
790
791 if (!flag.expired_in.is_undefined()) {
792 // if flag has become expired it should not have a "globals" flag defined anymore.
793 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
794 !version_less_than(JDK_Version::current(), flag.expired_in)) {
795 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
796 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
797 success = false;
798 }
799 }
800 }
801 }
802 return success;
803 }
804 #endif
805
806 // Parses a size specification string.
807 bool Arguments::atojulong(const char *s, julong* result) {
808 julong n = 0;
809
810 // First char must be a digit. Don't allow negative numbers or leading spaces.
811 if (!isdigit(*s)) {
812 return false;
813 }
814
815 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
816 char* remainder;
817 errno = 0;
818 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
819 if (errno != 0) {
820 return false;
821 }
822
823 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
824 if (remainder == s || strlen(remainder) > 1) {
825 return false;
826 }
827
828 switch (*remainder) {
829 case 'T': case 't':
830 *result = n * G * K;
831 // Check for overflow.
832 if (*result/((julong)G * K) != n) return false;
833 return true;
834 case 'G': case 'g':
835 *result = n * G;
836 if (*result/G != n) return false;
837 return true;
838 case 'M': case 'm':
839 *result = n * M;
840 if (*result/M != n) return false;
841 return true;
842 case 'K': case 'k':
843 *result = n * K;
844 if (*result/K != n) return false;
845 return true;
846 case '\0':
847 *result = n;
848 return true;
849 default:
850 return false;
851 }
852 }
853
854 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
855 if (size < min_size) return arg_too_small;
856 if (size > max_size) return arg_too_big;
857 return arg_in_range;
858 }
859
860 // Describe an argument out of range error
861 void Arguments::describe_range_error(ArgsRange errcode) {
862 switch(errcode) {
863 case arg_too_big:
864 jio_fprintf(defaultStream::error_stream(),
865 "The specified size exceeds the maximum "
866 "representable size.\n");
867 break;
868 case arg_too_small:
869 case arg_unreadable:
870 case arg_in_range:
871 // do nothing for now
872 break;
873 default:
874 ShouldNotReachHere();
875 }
876 }
877
878 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
879 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
880 return true;
881 } else {
882 return false;
883 }
884 }
885
886 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
887 char* end;
888 errno = 0;
889 double v = strtod(value, &end);
890 if ((errno != 0) || (*end != 0)) {
891 return false;
892 }
893
894 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
895 return true;
896 }
897 return false;
898 }
899
900 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
901 julong v;
902 int int_v;
903 intx intx_v;
904 bool is_neg = false;
905
906 if (flag == NULL) {
907 return false;
908 }
909
910 // Check the sign first since atojulong() parses only unsigned values.
911 if (*value == '-') {
912 if (!flag->is_intx() && !flag->is_int()) {
913 return false;
914 }
915 value++;
916 is_neg = true;
917 }
918 if (!Arguments::atojulong(value, &v)) {
919 return false;
920 }
921 if (flag->is_int()) {
922 int_v = (int) v;
923 if (is_neg) {
924 int_v = -int_v;
925 }
926 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
927 } else if (flag->is_uint()) {
928 uint uint_v = (uint) v;
929 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
930 } else if (flag->is_intx()) {
931 intx_v = (intx) v;
932 if (is_neg) {
933 intx_v = -intx_v;
934 }
935 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
936 } else if (flag->is_uintx()) {
937 uintx uintx_v = (uintx) v;
938 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
939 } else if (flag->is_uint64_t()) {
940 uint64_t uint64_t_v = (uint64_t) v;
941 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
942 } else if (flag->is_size_t()) {
943 size_t size_t_v = (size_t) v;
944 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
945 } else if (flag->is_double()) {
946 double double_v = (double) v;
947 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
948 } else {
949 return false;
950 }
951 }
952
953 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
954 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
955 // Contract: JVMFlag always returns a pointer that needs freeing.
956 FREE_C_HEAP_ARRAY(char, value);
957 return true;
958 }
959
960 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
961 const char* old_value = "";
962 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
963 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
964 size_t new_len = strlen(new_value);
965 const char* value;
966 char* free_this_too = NULL;
967 if (old_len == 0) {
968 value = new_value;
969 } else if (new_len == 0) {
970 value = old_value;
971 } else {
972 size_t length = old_len + 1 + new_len + 1;
973 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
974 // each new setting adds another LINE to the switch:
975 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
976 value = buf;
977 free_this_too = buf;
978 }
979 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
980 // JVMFlag always returns a pointer that needs freeing.
981 FREE_C_HEAP_ARRAY(char, value);
982 // JVMFlag made its own copy, so I must delete my own temp. buffer.
983 FREE_C_HEAP_ARRAY(char, free_this_too);
984 return true;
985 }
986
987 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
988 const char* real_name = real_flag_name(arg);
989 JDK_Version since = JDK_Version();
990 switch (is_deprecated_flag(arg, &since)) {
991 case -1: {
992 // Obsolete or expired, so don't process normally,
993 // but allow for an obsolete flag we're still
994 // temporarily allowing.
995 if (!is_obsolete_flag(arg, &since)) {
996 return real_name;
997 }
998 // Note if we're not considered obsolete then we can't be expired either
999 // as obsoletion must come first.
1000 return NULL;
1001 }
1002 case 0:
1003 return real_name;
1004 case 1: {
1005 if (warn) {
1006 char version[256];
1007 since.to_string(version, sizeof(version));
1008 if (real_name != arg) {
1009 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
1010 arg, version, real_name);
1011 } else {
1012 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
1013 arg, version);
1014 }
1015 }
1016 return real_name;
1017 }
1018 }
1019 ShouldNotReachHere();
1020 return NULL;
1021 }
1022
1023 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1024 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1025 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1026 const int max_tagset_size = 256;
1027 int max_tagset_len = max_tagset_size - 1;
1028 char tagset_buffer[max_tagset_size];
1029 tagset_buffer[0] = '\0';
1030
1031 // Write tag-set for aliased logging option, in string list form
1032 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1033 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1034 if (i > 0) {
1035 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1036 }
1037 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1038 }
1039 if (!alf.exactMatch) {
1040 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1041 }
1042 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1043 (on) ? "+" : "-",
1044 name,
1045 tagset_buffer,
1046 (on) ? LogLevel::name(alf.level) : "off");
1047 }
1048
1049 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1050 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1051 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1052 if (strcmp(alf.alias_name, name) == 0) {
1053 log_deprecated_flag(name, on, alf);
1054 return alf;
1055 }
1056 }
1057 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1058 return a;
1059 }
1060
1061 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1062
1063 // range of acceptable characters spelled out for portability reasons
1064 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1065 #define BUFLEN 255
1066 char name[BUFLEN+1];
1067 char dummy;
1068 const char* real_name;
1069 bool warn_if_deprecated = true;
1070
1071 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1072 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1073 if (alf.alias_name != NULL){
1074 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1075 return true;
1076 }
1077 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1078 if (real_name == NULL) {
1079 return false;
1080 }
1081 JVMFlag* flag = JVMFlag::find_flag(real_name);
1082 return set_bool_flag(flag, false, origin);
1083 }
1084 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1085 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1086 if (alf.alias_name != NULL){
1087 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1088 return true;
1089 }
1090 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1091 if (real_name == NULL) {
1092 return false;
1093 }
1094 JVMFlag* flag = JVMFlag::find_flag(real_name);
1095 return set_bool_flag(flag, true, origin);
1096 }
1097
1098 char punct;
1099 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1100 const char* value = strchr(arg, '=') + 1;
1101
1102 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1103 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1104 if (alf.alias_name != NULL) {
1105 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1106 return true;
1107 }
1108 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1109 if (real_name == NULL) {
1110 return false;
1111 }
1112 JVMFlag* flag = JVMFlag::find_flag(real_name);
1113 if (flag != NULL && flag->is_ccstr()) {
1114 if (flag->ccstr_accumulates()) {
1115 return append_to_string_flag(flag, value, origin);
1116 } else {
1117 if (value[0] == '\0') {
1118 value = NULL;
1119 }
1120 return set_string_flag(flag, value, origin);
1121 }
1122 } else {
1123 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1124 }
1125 }
1126
1127 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1128 const char* value = strchr(arg, '=') + 1;
1129 // -XX:Foo:=xxx will reset the string flag to the given value.
1130 if (value[0] == '\0') {
1131 value = NULL;
1132 }
1133 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1134 if (real_name == NULL) {
1135 return false;
1136 }
1137 JVMFlag* flag = JVMFlag::find_flag(real_name);
1138 return set_string_flag(flag, value, origin);
1139 }
1140
1141 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1142 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1143 #define NUMBER_RANGE "[0123456789eE+-]"
1144 char value[BUFLEN + 1];
1145 char value2[BUFLEN + 1];
1146 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1147 // Looks like a floating-point number -- try again with more lenient format string
1148 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1149 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1150 if (real_name == NULL) {
1151 return false;
1152 }
1153 JVMFlag* flag = JVMFlag::find_flag(real_name);
1154 return set_fp_numeric_flag(flag, value, origin);
1155 }
1156 }
1157
1158 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1159 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1160 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1161 if (real_name == NULL) {
1162 return false;
1163 }
1164 JVMFlag* flag = JVMFlag::find_flag(real_name);
1165 return set_numeric_flag(flag, value, origin);
1166 }
1167
1168 return false;
1169 }
1170
1171 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1172 assert(bldarray != NULL, "illegal argument");
1173
1174 if (arg == NULL) {
1175 return;
1176 }
1177
1178 int new_count = *count + 1;
1179
1180 // expand the array and add arg to the last element
1181 if (*bldarray == NULL) {
1182 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1183 } else {
1184 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1185 }
1186 (*bldarray)[*count] = os::strdup_check_oom(arg);
1187 *count = new_count;
1188 }
1189
1190 void Arguments::build_jvm_args(const char* arg) {
1191 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1192 }
1193
1194 void Arguments::build_jvm_flags(const char* arg) {
1195 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1196 }
1197
1198 // utility function to return a string that concatenates all
1199 // strings in a given char** array
1200 const char* Arguments::build_resource_string(char** args, int count) {
1201 if (args == NULL || count == 0) {
1202 return NULL;
1203 }
1204 size_t length = 0;
1205 for (int i = 0; i < count; i++) {
1206 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1207 }
1208 char* s = NEW_RESOURCE_ARRAY(char, length);
1209 char* dst = s;
1210 for (int j = 0; j < count; j++) {
1211 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1212 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1213 dst += offset;
1214 length -= offset;
1215 }
1216 return (const char*) s;
1217 }
1218
1219 void Arguments::print_on(outputStream* st) {
1220 st->print_cr("VM Arguments:");
1221 if (num_jvm_flags() > 0) {
1222 st->print("jvm_flags: "); print_jvm_flags_on(st);
1223 st->cr();
1224 }
1225 if (num_jvm_args() > 0) {
1226 st->print("jvm_args: "); print_jvm_args_on(st);
1227 st->cr();
1228 }
1229 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1230 if (_java_class_path != NULL) {
1231 char* path = _java_class_path->value();
1232 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1233 }
1234 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1235 }
1236
1237 void Arguments::print_summary_on(outputStream* st) {
1238 // Print the command line. Environment variables that are helpful for
1239 // reproducing the problem are written later in the hs_err file.
1240 // flags are from setting file
1241 if (num_jvm_flags() > 0) {
1242 st->print_raw("Settings File: ");
1243 print_jvm_flags_on(st);
1244 st->cr();
1245 }
1246 // args are the command line and environment variable arguments.
1247 st->print_raw("Command Line: ");
1248 if (num_jvm_args() > 0) {
1249 print_jvm_args_on(st);
1250 }
1251 // this is the classfile and any arguments to the java program
1252 if (java_command() != NULL) {
1253 st->print("%s", java_command());
1254 }
1255 st->cr();
1256 }
1257
1258 void Arguments::print_jvm_flags_on(outputStream* st) {
1259 if (_num_jvm_flags > 0) {
1260 for (int i=0; i < _num_jvm_flags; i++) {
1261 st->print("%s ", _jvm_flags_array[i]);
1262 }
1263 }
1264 }
1265
1266 void Arguments::print_jvm_args_on(outputStream* st) {
1267 if (_num_jvm_args > 0) {
1268 for (int i=0; i < _num_jvm_args; i++) {
1269 st->print("%s ", _jvm_args_array[i]);
1270 }
1271 }
1272 }
1273
1274 bool Arguments::process_argument(const char* arg,
1275 jboolean ignore_unrecognized,
1276 JVMFlag::Flags origin) {
1277 JDK_Version since = JDK_Version();
1278
1279 if (parse_argument(arg, origin)) {
1280 return true;
1281 }
1282
1283 // Determine if the flag has '+', '-', or '=' characters.
1284 bool has_plus_minus = (*arg == '+' || *arg == '-');
1285 const char* const argname = has_plus_minus ? arg + 1 : arg;
1286
1287 size_t arg_len;
1288 const char* equal_sign = strchr(argname, '=');
1289 if (equal_sign == NULL) {
1290 arg_len = strlen(argname);
1291 } else {
1292 arg_len = equal_sign - argname;
1293 }
1294
1295 // Only make the obsolete check for valid arguments.
1296 if (arg_len <= BUFLEN) {
1297 // Construct a string which consists only of the argument name without '+', '-', or '='.
1298 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1299 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1300 if (is_obsolete_flag(stripped_argname, &since)) {
1301 char version[256];
1302 since.to_string(version, sizeof(version));
1303 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1304 return true;
1305 }
1306 #ifndef PRODUCT
1307 else {
1308 const char* replacement;
1309 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1310 log_warning(arguments)("%s has been removed. Please use %s instead.",
1311 stripped_argname,
1312 replacement);
1313 return false;
1314 }
1315 }
1316 #endif //PRODUCT
1317 }
1318
1319 // For locked flags, report a custom error message if available.
1320 // Otherwise, report the standard unrecognized VM option.
1321 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1322 if (found_flag != NULL) {
1323 char locked_message_buf[BUFLEN];
1324 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1325 if (strlen(locked_message_buf) == 0) {
1326 if (found_flag->is_bool() && !has_plus_minus) {
1327 jio_fprintf(defaultStream::error_stream(),
1328 "Missing +/- setting for VM option '%s'\n", argname);
1329 } else if (!found_flag->is_bool() && has_plus_minus) {
1330 jio_fprintf(defaultStream::error_stream(),
1331 "Unexpected +/- setting in VM option '%s'\n", argname);
1332 } else {
1333 jio_fprintf(defaultStream::error_stream(),
1334 "Improperly specified VM option '%s'\n", argname);
1335 }
1336 } else {
1337 #ifdef PRODUCT
1338 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1339 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1340 if (ignore_unrecognized && mismatched) {
1341 return true;
1342 }
1343 #endif
1344 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1345 }
1346 } else {
1347 if (ignore_unrecognized) {
1348 return true;
1349 }
1350 jio_fprintf(defaultStream::error_stream(),
1351 "Unrecognized VM option '%s'\n", argname);
1352 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1353 if (fuzzy_matched != NULL) {
1354 jio_fprintf(defaultStream::error_stream(),
1355 "Did you mean '%s%s%s'? ",
1356 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1357 fuzzy_matched->_name,
1358 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1359 }
1360 }
1361
1362 // allow for commandline "commenting out" options like -XX:#+Verbose
1363 return arg[0] == '#';
1364 }
1365
1366 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1367 FILE* stream = fopen(file_name, "rb");
1368 if (stream == NULL) {
1369 if (should_exist) {
1370 jio_fprintf(defaultStream::error_stream(),
1371 "Could not open settings file %s\n", file_name);
1372 return false;
1373 } else {
1374 return true;
1375 }
1376 }
1377
1378 char token[1024];
1379 int pos = 0;
1380
1381 bool in_white_space = true;
1382 bool in_comment = false;
1383 bool in_quote = false;
1384 char quote_c = 0;
1385 bool result = true;
1386
1387 int c = getc(stream);
1388 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1389 if (in_white_space) {
1390 if (in_comment) {
1391 if (c == '\n') in_comment = false;
1392 } else {
1393 if (c == '#') in_comment = true;
1394 else if (!isspace(c)) {
1395 in_white_space = false;
1396 token[pos++] = c;
1397 }
1398 }
1399 } else {
1400 if (c == '\n' || (!in_quote && isspace(c))) {
1401 // token ends at newline, or at unquoted whitespace
1402 // this allows a way to include spaces in string-valued options
1403 token[pos] = '\0';
1404 logOption(token);
1405 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1406 build_jvm_flags(token);
1407 pos = 0;
1408 in_white_space = true;
1409 in_quote = false;
1410 } else if (!in_quote && (c == '\'' || c == '"')) {
1411 in_quote = true;
1412 quote_c = c;
1413 } else if (in_quote && (c == quote_c)) {
1414 in_quote = false;
1415 } else {
1416 token[pos++] = c;
1417 }
1418 }
1419 c = getc(stream);
1420 }
1421 if (pos > 0) {
1422 token[pos] = '\0';
1423 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1424 build_jvm_flags(token);
1425 }
1426 fclose(stream);
1427 return result;
1428 }
1429
1430 //=============================================================================================================
1431 // Parsing of properties (-D)
1432
1433 const char* Arguments::get_property(const char* key) {
1434 return PropertyList_get_value(system_properties(), key);
1435 }
1436
1437 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1438 const char* eq = strchr(prop, '=');
1439 const char* key;
1440 const char* value = "";
1441
1442 if (eq == NULL) {
1443 // property doesn't have a value, thus use passed string
1444 key = prop;
1445 } else {
1446 // property have a value, thus extract it and save to the
1447 // allocated string
1448 size_t key_len = eq - prop;
1449 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1450
1451 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1452 key = tmp_key;
1453
1454 value = &prop[key_len + 1];
1455 }
1456
1457 #if INCLUDE_CDS
1458 if (is_internal_module_property(key) ||
1459 strcmp(key, "jdk.module.main") == 0) {
1460 MetaspaceShared::disable_optimized_module_handling();
1461 log_info(cds)("Using optimized module handling disabled due to incompatible property: %s=%s", key, value);
1462 }
1463 #endif
1464
1465 if (strcmp(key, "java.compiler") == 0) {
1466 process_java_compiler_argument(value);
1467 // Record value in Arguments, but let it get passed to Java.
1468 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1469 // sun.java.launcher.is_altjvm property is
1470 // private and is processed in process_sun_java_launcher_properties();
1471 // the sun.java.launcher property is passed on to the java application
1472 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1473 // append is true, writable is true, internal is false
1474 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1475 WriteableProperty, ExternalProperty);
1476 } else {
1477 if (strcmp(key, "sun.java.command") == 0) {
1478 char *old_java_command = _java_command;
1479 _java_command = os::strdup_check_oom(value, mtArguments);
1480 if (old_java_command != NULL) {
1481 os::free(old_java_command);
1482 }
1483 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1484 // If this property is set on the command line then its value will be
1485 // displayed in VM error logs as the URL at which to submit such logs.
1486 // Normally the URL displayed in error logs is different from the value
1487 // of this system property, so a different property should have been
1488 // used here, but we leave this as-is in case someone depends upon it.
1489 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1490 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1491 // its value without going through the property list or making a Java call.
1492 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1493 if (old_java_vendor_url_bug != NULL) {
1494 os::free((void *)old_java_vendor_url_bug);
1495 }
1496 }
1497
1498 // Create new property and add at the end of the list
1499 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1500 }
1501
1502 if (key != prop) {
1503 // SystemProperty copy passed value, thus free previously allocated
1504 // memory
1505 FreeHeap((void *)key);
1506 }
1507
1508 return true;
1509 }
1510
1511 #if INCLUDE_CDS
1512 const char* unsupported_properties[] = { "jdk.module.limitmods",
1513 "jdk.module.upgrade.path",
1514 "jdk.module.patch.0" };
1515 const char* unsupported_options[] = { "--limit-modules",
1516 "--upgrade-module-path",
1517 "--patch-module"
1518 };
1519 void Arguments::check_unsupported_dumping_properties() {
1520 assert(is_dumping_archive(),
1521 "this function is only used with CDS dump time");
1522 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1523 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1524 SystemProperty* sp = system_properties();
1525 while (sp != NULL) {
1526 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1527 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1528 vm_exit_during_initialization(
1529 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1530 }
1531 }
1532 sp = sp->next();
1533 }
1534
1535 // Check for an exploded module build in use with -Xshare:dump.
1536 if (!has_jimage()) {
1537 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1538 }
1539 }
1540
1541 bool Arguments::check_unsupported_cds_runtime_properties() {
1542 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1543 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1544 if (ArchiveClassesAtExit != NULL) {
1545 // dynamic dumping, just return false for now.
1546 // check_unsupported_dumping_properties() will be called later to check the same set of
1547 // properties, and will exit the VM with the correct error message if the unsupported properties
1548 // are used.
1549 return false;
1550 }
1551 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1552 if (get_property(unsupported_properties[i]) != NULL) {
1553 if (RequireSharedSpaces) {
1554 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1555 }
1556 return true;
1557 }
1558 }
1559 return false;
1560 }
1561 #endif
1562
1563 //===========================================================================================================
1564 // Setting int/mixed/comp mode flags
1565
1566 void Arguments::set_mode_flags(Mode mode) {
1567 // Set up default values for all flags.
1568 // If you add a flag to any of the branches below,
1569 // add a default value for it here.
1570 set_java_compiler(false);
1571 _mode = mode;
1572
1573 // Ensure Agent_OnLoad has the correct initial values.
1574 // This may not be the final mode; mode may change later in onload phase.
1575 PropertyList_unique_add(&_system_properties, "java.vm.info",
1576 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1577
1578 UseInterpreter = true;
1579 UseCompiler = true;
1580 UseLoopCounter = true;
1581
1582 // Default values may be platform/compiler dependent -
1583 // use the saved values
1584 ClipInlining = Arguments::_ClipInlining;
1585 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1586 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1587 BackgroundCompilation = Arguments::_BackgroundCompilation;
1588 if (TieredCompilation) {
1589 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1590 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1591 }
1592 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1593 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1594 }
1595 }
1596
1597 // Change from defaults based on mode
1598 switch (mode) {
1599 default:
1600 ShouldNotReachHere();
1601 break;
1602 case _int:
1603 UseCompiler = false;
1604 UseLoopCounter = false;
1605 AlwaysCompileLoopMethods = false;
1606 UseOnStackReplacement = false;
1607 break;
1608 case _mixed:
1609 // same as default
1610 break;
1611 case _comp:
1612 UseInterpreter = false;
1613 BackgroundCompilation = false;
1614 ClipInlining = false;
1615 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1616 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1617 // compile a level 4 (C2) and then continue executing it.
1618 if (TieredCompilation) {
1619 Tier3InvokeNotifyFreqLog = 0;
1620 Tier4InvocationThreshold = 0;
1621 }
1622 break;
1623 }
1624 }
1625
1626 // Conflict: required to use shared spaces (-Xshare:on), but
1627 // incompatible command line options were chosen.
1628 static void no_shared_spaces(const char* message) {
1629 if (RequireSharedSpaces) {
1630 jio_fprintf(defaultStream::error_stream(),
1631 "Class data sharing is inconsistent with other specified options.\n");
1632 vm_exit_during_initialization("Unable to use shared archive", message);
1633 } else {
1634 log_info(cds)("Unable to use shared archive: %s", message);
1635 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1636 }
1637 }
1638
1639 void set_object_alignment() {
1640 // Object alignment.
1641 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1642 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1643 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1644 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1645 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1646 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1647
1648 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1649 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1650
1651 // Oop encoding heap max
1652 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1653
1654 if (SurvivorAlignmentInBytes == 0) {
1655 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1656 }
1657 }
1658
1659 size_t Arguments::max_heap_for_compressed_oops() {
1660 // Avoid sign flip.
1661 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1662 // We need to fit both the NULL page and the heap into the memory budget, while
1663 // keeping alignment constraints of the heap. To guarantee the latter, as the
1664 // NULL page is located before the heap, we pad the NULL page to the conservative
1665 // maximum alignment that the GC may ever impose upon the heap.
1666 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1667 _conservative_max_heap_alignment);
1668
1669 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1670 NOT_LP64(ShouldNotReachHere(); return 0);
1671 }
1672
1673 void Arguments::set_use_compressed_oops() {
1674 #ifndef ZERO
1675 #ifdef _LP64
1676 // MaxHeapSize is not set up properly at this point, but
1677 // the only value that can override MaxHeapSize if we are
1678 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1679 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1680
1681 if (max_heap_size <= max_heap_for_compressed_oops()) {
1682 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1683 FLAG_SET_ERGO(UseCompressedOops, true);
1684 }
1685 } else {
1686 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1687 warning("Max heap size too large for Compressed Oops");
1688 FLAG_SET_DEFAULT(UseCompressedOops, false);
1689 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1690 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1691 }
1692 }
1693 }
1694 #endif // _LP64
1695 #endif // ZERO
1696 }
1697
1698
1699 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1700 // set_use_compressed_oops().
1701 void Arguments::set_use_compressed_klass_ptrs() {
1702 #ifndef ZERO
1703 #ifdef _LP64
1704 // On some architectures, the use of UseCompressedClassPointers implies the use of
1705 // UseCompressedOops. The reason is that the rheap_base register of said platforms
1706 // is reused to perform some optimized spilling, in order to use rheap_base as a
1707 // temp register. But by treating it as any other temp register, spilling can typically
1708 // be completely avoided instead. So it is better not to perform this trick. And by
1709 // not having that reliance, large heaps, or heaps not supporting compressed oops,
1710 // can still use compressed class pointers.
1711 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) {
1712 if (UseCompressedClassPointers) {
1713 warning("UseCompressedClassPointers requires UseCompressedOops");
1714 }
1715 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1716 } else {
1717 // Turn on UseCompressedClassPointers too
1718 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1719 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1720 }
1721 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1722 if (UseCompressedClassPointers) {
1723 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1724 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1725 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1726 }
1727 }
1728 }
1729 #endif // _LP64
1730 #endif // !ZERO
1731 }
1732
1733 void Arguments::set_conservative_max_heap_alignment() {
1734 // The conservative maximum required alignment for the heap is the maximum of
1735 // the alignments imposed by several sources: any requirements from the heap
1736 // itself and the maximum page size we may run the VM with.
1737 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1738 _conservative_max_heap_alignment = MAX4(heap_alignment,
1739 (size_t)os::vm_allocation_granularity(),
1740 os::max_page_size(),
1741 GCArguments::compute_heap_alignment());
1742 }
1743
1744 jint Arguments::set_ergonomics_flags() {
1745 GCConfig::initialize();
1746
1747 set_conservative_max_heap_alignment();
1748
1749 #ifndef ZERO
1750 #ifdef _LP64
1751 set_use_compressed_oops();
1752
1753 // set_use_compressed_klass_ptrs() must be called after calling
1754 // set_use_compressed_oops().
1755 set_use_compressed_klass_ptrs();
1756
1757 // Also checks that certain machines are slower with compressed oops
1758 // in vm_version initialization code.
1759 #endif // _LP64
1760 #endif // !ZERO
1761
1762 return JNI_OK;
1763 }
1764
1765 julong Arguments::limit_by_allocatable_memory(julong limit) {
1766 julong max_allocatable;
1767 julong result = limit;
1768 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1769 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1770 }
1771 return result;
1772 }
1773
1774 // Use static initialization to get the default before parsing
1775 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1776
1777 void Arguments::set_heap_size() {
1778 julong phys_mem;
1779
1780 // If the user specified one of these options, they
1781 // want specific memory sizing so do not limit memory
1782 // based on compressed oops addressability.
1783 // Also, memory limits will be calculated based on
1784 // available os physical memory, not our MaxRAM limit,
1785 // unless MaxRAM is also specified.
1786 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1787 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1788 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1789 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1790 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1791 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1792 !FLAG_IS_DEFAULT(MaxRAM));
1793 if (override_coop_limit) {
1794 if (FLAG_IS_DEFAULT(MaxRAM)) {
1795 phys_mem = os::physical_memory();
1796 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1797 } else {
1798 phys_mem = (julong)MaxRAM;
1799 }
1800 } else {
1801 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1802 : (julong)MaxRAM;
1803 }
1804
1805
1806 // Convert deprecated flags
1807 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1808 !FLAG_IS_DEFAULT(MaxRAMFraction))
1809 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1810
1811 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1812 !FLAG_IS_DEFAULT(MinRAMFraction))
1813 MinRAMPercentage = 100.0 / MinRAMFraction;
1814
1815 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1816 !FLAG_IS_DEFAULT(InitialRAMFraction))
1817 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1818
1819 // If the maximum heap size has not been set with -Xmx,
1820 // then set it as fraction of the size of physical memory,
1821 // respecting the maximum and minimum sizes of the heap.
1822 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1823 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1824 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1825 if (reasonable_min < MaxHeapSize) {
1826 // Small physical memory, so use a minimum fraction of it for the heap
1827 reasonable_max = reasonable_min;
1828 } else {
1829 // Not-small physical memory, so require a heap at least
1830 // as large as MaxHeapSize
1831 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1832 }
1833
1834 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1835 // Limit the heap size to ErgoHeapSizeLimit
1836 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1837 }
1838
1839 #ifdef _LP64
1840 if (UseCompressedOops || UseCompressedClassPointers) {
1841 // HeapBaseMinAddress can be greater than default but not less than.
1842 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1843 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1844 // matches compressed oops printing flags
1845 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1846 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1847 DefaultHeapBaseMinAddress,
1848 DefaultHeapBaseMinAddress/G,
1849 HeapBaseMinAddress);
1850 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1851 }
1852 }
1853 }
1854 if (UseCompressedOops) {
1855 // Limit the heap size to the maximum possible when using compressed oops
1856 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1857
1858 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1859 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1860 // but it should be not less than default MaxHeapSize.
1861 max_coop_heap -= HeapBaseMinAddress;
1862 }
1863
1864 // If user specified flags prioritizing os physical
1865 // memory limits, then disable compressed oops if
1866 // limits exceed max_coop_heap and UseCompressedOops
1867 // was not specified.
1868 if (reasonable_max > max_coop_heap) {
1869 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1870 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1871 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1872 "Please check the setting of MaxRAMPercentage %5.2f."
1873 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1874 FLAG_SET_ERGO(UseCompressedOops, false);
1875 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1876 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1877 }
1878 } else {
1879 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1880 }
1881 }
1882 }
1883 #endif // _LP64
1884
1885 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1886
1887 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1888 // An initial heap size was specified on the command line,
1889 // so be sure that the maximum size is consistent. Done
1890 // after call to limit_by_allocatable_memory because that
1891 // method might reduce the allocation size.
1892 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1893 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1894 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1895 }
1896
1897 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1898 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1899 }
1900
1901 // If the minimum or initial heap_size have not been set or requested to be set
1902 // ergonomically, set them accordingly.
1903 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1904 julong reasonable_minimum = (julong)(OldSize + NewSize);
1905
1906 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1907
1908 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1909
1910 if (InitialHeapSize == 0) {
1911 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1912
1913 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1914 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1915
1916 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1917
1918 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1919 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1920 }
1921 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1922 // synchronize with InitialHeapSize to avoid errors with the default value.
1923 if (MinHeapSize == 0) {
1924 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1925 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1926 }
1927 }
1928 }
1929
1930 // This option inspects the machine and attempts to set various
1931 // parameters to be optimal for long-running, memory allocation
1932 // intensive jobs. It is intended for machines with large
1933 // amounts of cpu and memory.
1934 jint Arguments::set_aggressive_heap_flags() {
1935 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1936 // VM, but we may not be able to represent the total physical memory
1937 // available (like having 8gb of memory on a box but using a 32bit VM).
1938 // Thus, we need to make sure we're using a julong for intermediate
1939 // calculations.
1940 julong initHeapSize;
1941 julong total_memory = os::physical_memory();
1942
1943 if (total_memory < (julong) 256 * M) {
1944 jio_fprintf(defaultStream::error_stream(),
1945 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1946 vm_exit(1);
1947 }
1948
1949 // The heap size is half of available memory, or (at most)
1950 // all of possible memory less 160mb (leaving room for the OS
1951 // when using ISM). This is the maximum; because adaptive sizing
1952 // is turned on below, the actual space used may be smaller.
1953
1954 initHeapSize = MIN2(total_memory / (julong) 2,
1955 total_memory - (julong) 160 * M);
1956
1957 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1958
1959 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1960 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1961 return JNI_EINVAL;
1962 }
1963 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1964 return JNI_EINVAL;
1965 }
1966 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1967 return JNI_EINVAL;
1968 }
1969 }
1970 if (FLAG_IS_DEFAULT(NewSize)) {
1971 // Make the young generation 3/8ths of the total heap.
1972 if (FLAG_SET_CMDLINE(NewSize,
1973 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1974 return JNI_EINVAL;
1975 }
1976 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1977 return JNI_EINVAL;
1978 }
1979 }
1980
1981 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1982 FLAG_SET_DEFAULT(UseLargePages, true);
1983 #endif
1984
1985 // Increase some data structure sizes for efficiency
1986 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1987 return JNI_EINVAL;
1988 }
1989 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1990 return JNI_EINVAL;
1991 }
1992 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1993 return JNI_EINVAL;
1994 }
1995
1996 // See the OldPLABSize comment below, but replace 'after promotion'
1997 // with 'after copying'. YoungPLABSize is the size of the survivor
1998 // space per-gc-thread buffers. The default is 4kw.
1999 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2000 return JNI_EINVAL;
2001 }
2002
2003 // OldPLABSize is the size of the buffers in the old gen that
2004 // UseParallelGC uses to promote live data that doesn't fit in the
2005 // survivor spaces. At any given time, there's one for each gc thread.
2006 // The default size is 1kw. These buffers are rarely used, since the
2007 // survivor spaces are usually big enough. For specjbb, however, there
2008 // are occasions when there's lots of live data in the young gen
2009 // and we end up promoting some of it. We don't have a definite
2010 // explanation for why bumping OldPLABSize helps, but the theory
2011 // is that a bigger PLAB results in retaining something like the
2012 // original allocation order after promotion, which improves mutator
2013 // locality. A minor effect may be that larger PLABs reduce the
2014 // number of PLAB allocation events during gc. The value of 8kw
2015 // was arrived at by experimenting with specjbb.
2016 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2017 return JNI_EINVAL;
2018 }
2019
2020 // Enable parallel GC and adaptive generation sizing
2021 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
2022 return JNI_EINVAL;
2023 }
2024
2025 // Encourage steady state memory management
2026 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
2027 return JNI_EINVAL;
2028 }
2029
2030 // This appears to improve mutator locality
2031 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2032 return JNI_EINVAL;
2033 }
2034
2035 return JNI_OK;
2036 }
2037
2038 // This must be called after ergonomics.
2039 void Arguments::set_bytecode_flags() {
2040 if (!RewriteBytecodes) {
2041 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2042 }
2043 }
2044
2045 // Aggressive optimization flags
2046 jint Arguments::set_aggressive_opts_flags() {
2047 #ifdef COMPILER2
2048 if (AggressiveUnboxing) {
2049 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2050 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2051 } else if (!EliminateAutoBox) {
2052 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2053 AggressiveUnboxing = false;
2054 }
2055 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2056 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2057 } else if (!DoEscapeAnalysis) {
2058 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2059 AggressiveUnboxing = false;
2060 }
2061 }
2062 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2063 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2064 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2065 }
2066 // Feed the cache size setting into the JDK
2067 char buffer[1024];
2068 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2069 if (!add_property(buffer)) {
2070 return JNI_ENOMEM;
2071 }
2072 }
2073 #endif
2074
2075 return JNI_OK;
2076 }
2077
2078 //===========================================================================================================
2079 // Parsing of java.compiler property
2080
2081 void Arguments::process_java_compiler_argument(const char* arg) {
2082 // For backwards compatibility, Djava.compiler=NONE or ""
2083 // causes us to switch to -Xint mode UNLESS -Xdebug
2084 // is also specified.
2085 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2086 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2087 }
2088 }
2089
2090 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2091 _sun_java_launcher = os::strdup_check_oom(launcher);
2092 }
2093
2094 bool Arguments::created_by_java_launcher() {
2095 assert(_sun_java_launcher != NULL, "property must have value");
2096 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2097 }
2098
2099 bool Arguments::sun_java_launcher_is_altjvm() {
2100 return _sun_java_launcher_is_altjvm;
2101 }
2102
2103 //===========================================================================================================
2104 // Parsing of main arguments
2105
2106 unsigned int addreads_count = 0;
2107 unsigned int addexports_count = 0;
2108 unsigned int addopens_count = 0;
2109 unsigned int addmods_count = 0;
2110 unsigned int patch_mod_count = 0;
2111
2112 // Check the consistency of vm_init_args
2113 bool Arguments::check_vm_args_consistency() {
2114 // Method for adding checks for flag consistency.
2115 // The intent is to warn the user of all possible conflicts,
2116 // before returning an error.
2117 // Note: Needs platform-dependent factoring.
2118 bool status = true;
2119
2120 if (TLABRefillWasteFraction == 0) {
2121 jio_fprintf(defaultStream::error_stream(),
2122 "TLABRefillWasteFraction should be a denominator, "
2123 "not " SIZE_FORMAT "\n",
2124 TLABRefillWasteFraction);
2125 status = false;
2126 }
2127
2128 if (PrintNMTStatistics) {
2129 #if INCLUDE_NMT
2130 if (MemTracker::tracking_level() == NMT_off) {
2131 #endif // INCLUDE_NMT
2132 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2133 PrintNMTStatistics = false;
2134 #if INCLUDE_NMT
2135 }
2136 #endif
2137 }
2138
2139 status = CompilerConfig::check_args_consistency(status);
2140 #if INCLUDE_JVMCI
2141 if (status && EnableJVMCI) {
2142 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2143 AddProperty, UnwriteableProperty, InternalProperty);
2144 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2145 return false;
2146 }
2147 }
2148 #endif
2149
2150 #ifndef SUPPORT_RESERVED_STACK_AREA
2151 if (StackReservedPages != 0) {
2152 FLAG_SET_CMDLINE(StackReservedPages, 0);
2153 warning("Reserved Stack Area not supported on this platform");
2154 }
2155 #endif
2156
2157 status = status && GCArguments::check_args_consistency();
2158
2159 return status;
2160 }
2161
2162 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2163 const char* option_type) {
2164 if (ignore) return false;
2165
2166 const char* spacer = " ";
2167 if (option_type == NULL) {
2168 option_type = ++spacer; // Set both to the empty string.
2169 }
2170
2171 jio_fprintf(defaultStream::error_stream(),
2172 "Unrecognized %s%soption: %s\n", option_type, spacer,
2173 option->optionString);
2174 return true;
2175 }
2176
2177 static const char* user_assertion_options[] = {
2178 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2179 };
2180
2181 static const char* system_assertion_options[] = {
2182 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2183 };
2184
2185 bool Arguments::parse_uintx(const char* value,
2186 uintx* uintx_arg,
2187 uintx min_size) {
2188
2189 // Check the sign first since atojulong() parses only unsigned values.
2190 bool value_is_positive = !(*value == '-');
2191
2192 if (value_is_positive) {
2193 julong n;
2194 bool good_return = atojulong(value, &n);
2195 if (good_return) {
2196 bool above_minimum = n >= min_size;
2197 bool value_is_too_large = n > max_uintx;
2198
2199 if (above_minimum && !value_is_too_large) {
2200 *uintx_arg = n;
2201 return true;
2202 }
2203 }
2204 }
2205 return false;
2206 }
2207
2208 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2209 assert(is_internal_module_property(prop_name) ||
2210 strcmp(prop_name, "jdk.module.illegalAccess") == 0, "unknown module property: '%s'", prop_name);
2211 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2212 char* property = AllocateHeap(prop_len, mtArguments);
2213 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2214 if (ret < 0 || ret >= (int)prop_len) {
2215 FreeHeap(property);
2216 return false;
2217 }
2218 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2219 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2220 // that multiple occurrences of the associated flag just causes the existing property value to be
2221 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2222 // to a property after we have finished flag processing.
2223 bool added = add_property(property, WriteableProperty, internal);
2224 FreeHeap(property);
2225 return added;
2226 }
2227
2228 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2229 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2230 const unsigned int props_count_limit = 1000;
2231 const int max_digits = 3;
2232 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2233
2234 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2235 if (count < props_count_limit) {
2236 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2237 char* property = AllocateHeap(prop_len, mtArguments);
2238 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2239 if (ret < 0 || ret >= (int)prop_len) {
2240 FreeHeap(property);
2241 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2242 return false;
2243 }
2244 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2245 FreeHeap(property);
2246 return added;
2247 }
2248
2249 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2250 return false;
2251 }
2252
2253 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2254 julong* long_arg,
2255 julong min_size,
2256 julong max_size) {
2257 if (!atojulong(s, long_arg)) return arg_unreadable;
2258 return check_memory_size(*long_arg, min_size, max_size);
2259 }
2260
2261 // Parse JavaVMInitArgs structure
2262
2263 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2264 const JavaVMInitArgs *java_tool_options_args,
2265 const JavaVMInitArgs *java_options_args,
2266 const JavaVMInitArgs *cmd_line_args) {
2267 bool patch_mod_javabase = false;
2268
2269 // Save default settings for some mode flags
2270 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2271 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2272 Arguments::_ClipInlining = ClipInlining;
2273 Arguments::_BackgroundCompilation = BackgroundCompilation;
2274 if (TieredCompilation) {
2275 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2276 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2277 }
2278
2279 // Remember the default value of SharedBaseAddress.
2280 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2281
2282 // Setup flags for mixed which is the default
2283 set_mode_flags(_mixed);
2284
2285 // Parse args structure generated from java.base vm options resource
2286 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2287 if (result != JNI_OK) {
2288 return result;
2289 }
2290
2291 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2292 // variable (if present).
2293 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2294 if (result != JNI_OK) {
2295 return result;
2296 }
2297
2298 // Parse args structure generated from the command line flags.
2299 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2300 if (result != JNI_OK) {
2301 return result;
2302 }
2303
2304 // Parse args structure generated from the _JAVA_OPTIONS environment
2305 // variable (if present) (mimics classic VM)
2306 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2307 if (result != JNI_OK) {
2308 return result;
2309 }
2310
2311 // We need to ensure processor and memory resources have been properly
2312 // configured - which may rely on arguments we just processed - before
2313 // doing the final argument processing. Any argument processing that
2314 // needs to know about processor and memory resources must occur after
2315 // this point.
2316
2317 os::init_container_support();
2318
2319 // Do final processing now that all arguments have been parsed
2320 result = finalize_vm_init_args(patch_mod_javabase);
2321 if (result != JNI_OK) {
2322 return result;
2323 }
2324
2325 return JNI_OK;
2326 }
2327
2328 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2329 // represents a valid JDWP agent. is_path==true denotes that we
2330 // are dealing with -agentpath (case where name is a path), otherwise with
2331 // -agentlib
2332 bool valid_jdwp_agent(char *name, bool is_path) {
2333 char *_name;
2334 const char *_jdwp = "jdwp";
2335 size_t _len_jdwp, _len_prefix;
2336
2337 if (is_path) {
2338 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2339 return false;
2340 }
2341
2342 _name++; // skip past last path separator
2343 _len_prefix = strlen(JNI_LIB_PREFIX);
2344
2345 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2346 return false;
2347 }
2348
2349 _name += _len_prefix;
2350 _len_jdwp = strlen(_jdwp);
2351
2352 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2353 _name += _len_jdwp;
2354 }
2355 else {
2356 return false;
2357 }
2358
2359 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2360 return false;
2361 }
2362
2363 return true;
2364 }
2365
2366 if (strcmp(name, _jdwp) == 0) {
2367 return true;
2368 }
2369
2370 return false;
2371 }
2372
2373 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2374 // --patch-module=<module>=<file>(<pathsep><file>)*
2375 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2376 // Find the equal sign between the module name and the path specification
2377 const char* module_equal = strchr(patch_mod_tail, '=');
2378 if (module_equal == NULL) {
2379 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2380 return JNI_ERR;
2381 } else {
2382 // Pick out the module name
2383 size_t module_len = module_equal - patch_mod_tail;
2384 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2385 if (module_name != NULL) {
2386 memcpy(module_name, patch_mod_tail, module_len);
2387 *(module_name + module_len) = '\0';
2388 // The path piece begins one past the module_equal sign
2389 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2390 FREE_C_HEAP_ARRAY(char, module_name);
2391 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2392 return JNI_ENOMEM;
2393 }
2394 } else {
2395 return JNI_ENOMEM;
2396 }
2397 }
2398 return JNI_OK;
2399 }
2400
2401 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2402 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2403 // The min and max sizes match the values in globals.hpp, but scaled
2404 // with K. The values have been chosen so that alignment with page
2405 // size doesn't change the max value, which makes the conversions
2406 // back and forth between Xss value and ThreadStackSize value easier.
2407 // The values have also been chosen to fit inside a 32-bit signed type.
2408 const julong min_ThreadStackSize = 0;
2409 const julong max_ThreadStackSize = 1 * M;
2410
2411 const julong min_size = min_ThreadStackSize * K;
2412 const julong max_size = max_ThreadStackSize * K;
2413
2414 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2415
2416 julong size = 0;
2417 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2418 if (errcode != arg_in_range) {
2419 bool silent = (option == NULL); // Allow testing to silence error messages
2420 if (!silent) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "Invalid thread stack size: %s\n", option->optionString);
2423 describe_range_error(errcode);
2424 }
2425 return JNI_EINVAL;
2426 }
2427
2428 // Internally track ThreadStackSize in units of 1024 bytes.
2429 const julong size_aligned = align_up(size, K);
2430 assert(size <= size_aligned,
2431 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2432 size, size_aligned);
2433
2434 const julong size_in_K = size_aligned / K;
2435 assert(size_in_K < (julong)max_intx,
2436 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2437 size_in_K);
2438
2439 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2440 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2441 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2442 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2443 max_expanded, size_in_K);
2444
2445 *out_ThreadStackSize = (intx)size_in_K;
2446
2447 return JNI_OK;
2448 }
2449
2450 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2451 // For match_option to return remaining or value part of option string
2452 const char* tail;
2453
2454 // iterate over arguments
2455 for (int index = 0; index < args->nOptions; index++) {
2456 bool is_absolute_path = false; // for -agentpath vs -agentlib
2457
2458 const JavaVMOption* option = args->options + index;
2459
2460 if (!match_option(option, "-Djava.class.path", &tail) &&
2461 !match_option(option, "-Dsun.java.command", &tail) &&
2462 !match_option(option, "-Dsun.java.launcher", &tail)) {
2463
2464 // add all jvm options to the jvm_args string. This string
2465 // is used later to set the java.vm.args PerfData string constant.
2466 // the -Djava.class.path and the -Dsun.java.command options are
2467 // omitted from jvm_args string as each have their own PerfData
2468 // string constant object.
2469 build_jvm_args(option->optionString);
2470 }
2471
2472 // -verbose:[class/module/gc/jni]
2473 if (match_option(option, "-verbose", &tail)) {
2474 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2475 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2476 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2477 } else if (!strcmp(tail, ":module")) {
2478 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2479 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2480 } else if (!strcmp(tail, ":gc")) {
2481 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2482 } else if (!strcmp(tail, ":jni")) {
2483 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2484 }
2485 // -da / -ea / -disableassertions / -enableassertions
2486 // These accept an optional class/package name separated by a colon, e.g.,
2487 // -da:java.lang.Thread.
2488 } else if (match_option(option, user_assertion_options, &tail, true)) {
2489 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2490 if (*tail == '\0') {
2491 JavaAssertions::setUserClassDefault(enable);
2492 } else {
2493 assert(*tail == ':', "bogus match by match_option()");
2494 JavaAssertions::addOption(tail + 1, enable);
2495 }
2496 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2497 } else if (match_option(option, system_assertion_options, &tail, false)) {
2498 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2499 JavaAssertions::setSystemClassDefault(enable);
2500 // -bootclasspath:
2501 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2502 jio_fprintf(defaultStream::output_stream(),
2503 "-Xbootclasspath is no longer a supported option.\n");
2504 return JNI_EINVAL;
2505 // -bootclasspath/a:
2506 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2507 Arguments::append_sysclasspath(tail);
2508 #if INCLUDE_CDS
2509 MetaspaceShared::disable_optimized_module_handling();
2510 log_info(cds)("Using optimized module handling disabled due to bootclasspath was appended");
2511 #endif
2512 // -bootclasspath/p:
2513 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2514 jio_fprintf(defaultStream::output_stream(),
2515 "-Xbootclasspath/p is no longer a supported option.\n");
2516 return JNI_EINVAL;
2517 // -Xrun
2518 } else if (match_option(option, "-Xrun", &tail)) {
2519 if (tail != NULL) {
2520 const char* pos = strchr(tail, ':');
2521 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2522 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2523 jio_snprintf(name, len + 1, "%s", tail);
2524
2525 char *options = NULL;
2526 if(pos != NULL) {
2527 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2528 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2529 }
2530 #if !INCLUDE_JVMTI
2531 if (strcmp(name, "jdwp") == 0) {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Debugging agents are not supported in this VM\n");
2534 return JNI_ERR;
2535 }
2536 #endif // !INCLUDE_JVMTI
2537 add_init_library(name, options);
2538 }
2539 } else if (match_option(option, "--add-reads=", &tail)) {
2540 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2541 return JNI_ENOMEM;
2542 }
2543 } else if (match_option(option, "--add-exports=", &tail)) {
2544 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2545 return JNI_ENOMEM;
2546 }
2547 } else if (match_option(option, "--add-opens=", &tail)) {
2548 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2549 return JNI_ENOMEM;
2550 }
2551 } else if (match_option(option, "--add-modules=", &tail)) {
2552 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2553 return JNI_ENOMEM;
2554 }
2555 } else if (match_option(option, "--limit-modules=", &tail)) {
2556 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2557 return JNI_ENOMEM;
2558 }
2559 } else if (match_option(option, "--module-path=", &tail)) {
2560 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2561 return JNI_ENOMEM;
2562 }
2563 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2564 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2565 return JNI_ENOMEM;
2566 }
2567 } else if (match_option(option, "--patch-module=", &tail)) {
2568 // --patch-module=<module>=<file>(<pathsep><file>)*
2569 int res = process_patch_mod_option(tail, patch_mod_javabase);
2570 if (res != JNI_OK) {
2571 return res;
2572 }
2573 } else if (match_option(option, "--illegal-access=", &tail)) {
2574 if (!create_module_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2575 return JNI_ENOMEM;
2576 }
2577 // -agentlib and -agentpath
2578 } else if (match_option(option, "-agentlib:", &tail) ||
2579 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2580 if(tail != NULL) {
2581 const char* pos = strchr(tail, '=');
2582 char* name;
2583 if (pos == NULL) {
2584 name = os::strdup_check_oom(tail, mtArguments);
2585 } else {
2586 size_t len = pos - tail;
2587 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2588 memcpy(name, tail, len);
2589 name[len] = '\0';
2590 }
2591
2592 char *options = NULL;
2593 if(pos != NULL) {
2594 options = os::strdup_check_oom(pos + 1, mtArguments);
2595 }
2596 #if !INCLUDE_JVMTI
2597 if (valid_jdwp_agent(name, is_absolute_path)) {
2598 jio_fprintf(defaultStream::error_stream(),
2599 "Debugging agents are not supported in this VM\n");
2600 return JNI_ERR;
2601 }
2602 #endif // !INCLUDE_JVMTI
2603 add_init_agent(name, options, is_absolute_path);
2604 }
2605 // -javaagent
2606 } else if (match_option(option, "-javaagent:", &tail)) {
2607 #if !INCLUDE_JVMTI
2608 jio_fprintf(defaultStream::error_stream(),
2609 "Instrumentation agents are not supported in this VM\n");
2610 return JNI_ERR;
2611 #else
2612 if (tail != NULL) {
2613 size_t length = strlen(tail) + 1;
2614 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2615 jio_snprintf(options, length, "%s", tail);
2616 add_instrument_agent("instrument", options, false);
2617 // java agents need module java.instrument
2618 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2619 return JNI_ENOMEM;
2620 }
2621 }
2622 #endif // !INCLUDE_JVMTI
2623 // --enable_preview
2624 } else if (match_option(option, "--enable-preview")) {
2625 set_enable_preview();
2626 // -Xnoclassgc
2627 } else if (match_option(option, "-Xnoclassgc")) {
2628 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2629 return JNI_EINVAL;
2630 }
2631 // -Xbatch
2632 } else if (match_option(option, "-Xbatch")) {
2633 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2634 return JNI_EINVAL;
2635 }
2636 // -Xmn for compatibility with other JVM vendors
2637 } else if (match_option(option, "-Xmn", &tail)) {
2638 julong long_initial_young_size = 0;
2639 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2640 if (errcode != arg_in_range) {
2641 jio_fprintf(defaultStream::error_stream(),
2642 "Invalid initial young generation size: %s\n", option->optionString);
2643 describe_range_error(errcode);
2644 return JNI_EINVAL;
2645 }
2646 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2650 return JNI_EINVAL;
2651 }
2652 // -Xms
2653 } else if (match_option(option, "-Xms", &tail)) {
2654 julong size = 0;
2655 // an initial heap size of 0 means automatically determine
2656 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2657 if (errcode != arg_in_range) {
2658 jio_fprintf(defaultStream::error_stream(),
2659 "Invalid initial heap size: %s\n", option->optionString);
2660 describe_range_error(errcode);
2661 return JNI_EINVAL;
2662 }
2663 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 // -Xmx
2670 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2671 julong long_max_heap_size = 0;
2672 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2673 if (errcode != arg_in_range) {
2674 jio_fprintf(defaultStream::error_stream(),
2675 "Invalid maximum heap size: %s\n", option->optionString);
2676 describe_range_error(errcode);
2677 return JNI_EINVAL;
2678 }
2679 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 // Xmaxf
2683 } else if (match_option(option, "-Xmaxf", &tail)) {
2684 char* err;
2685 int maxf = (int)(strtod(tail, &err) * 100);
2686 if (*err != '\0' || *tail == '\0') {
2687 jio_fprintf(defaultStream::error_stream(),
2688 "Bad max heap free percentage size: %s\n",
2689 option->optionString);
2690 return JNI_EINVAL;
2691 } else {
2692 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 }
2696 // Xminf
2697 } else if (match_option(option, "-Xminf", &tail)) {
2698 char* err;
2699 int minf = (int)(strtod(tail, &err) * 100);
2700 if (*err != '\0' || *tail == '\0') {
2701 jio_fprintf(defaultStream::error_stream(),
2702 "Bad min heap free percentage size: %s\n",
2703 option->optionString);
2704 return JNI_EINVAL;
2705 } else {
2706 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2707 return JNI_EINVAL;
2708 }
2709 }
2710 // -Xss
2711 } else if (match_option(option, "-Xss", &tail)) {
2712 intx value = 0;
2713 jint err = parse_xss(option, tail, &value);
2714 if (err != JNI_OK) {
2715 return err;
2716 }
2717 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2718 return JNI_EINVAL;
2719 }
2720 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2721 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2722 julong long_ReservedCodeCacheSize = 0;
2723
2724 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2725 if (errcode != arg_in_range) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "Invalid maximum code cache size: %s.\n", option->optionString);
2728 return JNI_EINVAL;
2729 }
2730 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 // -green
2734 } else if (match_option(option, "-green")) {
2735 jio_fprintf(defaultStream::error_stream(),
2736 "Green threads support not available\n");
2737 return JNI_EINVAL;
2738 // -native
2739 } else if (match_option(option, "-native")) {
2740 // HotSpot always uses native threads, ignore silently for compatibility
2741 // -Xrs
2742 } else if (match_option(option, "-Xrs")) {
2743 // Classic/EVM option, new functionality
2744 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2745 return JNI_EINVAL;
2746 }
2747 // -Xprof
2748 } else if (match_option(option, "-Xprof")) {
2749 char version[256];
2750 // Obsolete in JDK 10
2751 JDK_Version::jdk(10).to_string(version, sizeof(version));
2752 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2753 // -Xinternalversion
2754 } else if (match_option(option, "-Xinternalversion")) {
2755 jio_fprintf(defaultStream::output_stream(), "%s\n",
2756 VM_Version::internal_vm_info_string());
2757 vm_exit(0);
2758 #ifndef PRODUCT
2759 // -Xprintflags
2760 } else if (match_option(option, "-Xprintflags")) {
2761 JVMFlag::printFlags(tty, false);
2762 vm_exit(0);
2763 #endif
2764 // -D
2765 } else if (match_option(option, "-D", &tail)) {
2766 const char* value;
2767 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2768 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2769 // abort if -Djava.endorsed.dirs is set
2770 jio_fprintf(defaultStream::output_stream(),
2771 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2772 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2773 return JNI_EINVAL;
2774 }
2775 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2776 *value != '\0' && strcmp(value, "\"\"") != 0) {
2777 // abort if -Djava.ext.dirs is set
2778 jio_fprintf(defaultStream::output_stream(),
2779 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2780 return JNI_EINVAL;
2781 }
2782 // Check for module related properties. They must be set using the modules
2783 // options. For example: use "--add-modules=java.sql", not
2784 // "-Djdk.module.addmods=java.sql"
2785 if (is_internal_module_property(option->optionString + 2)) {
2786 needs_module_property_warning = true;
2787 continue;
2788 }
2789 if (!add_property(tail)) {
2790 return JNI_ENOMEM;
2791 }
2792 // Out of the box management support
2793 if (match_option(option, "-Dcom.sun.management", &tail)) {
2794 #if INCLUDE_MANAGEMENT
2795 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2796 return JNI_EINVAL;
2797 }
2798 // management agent in module jdk.management.agent
2799 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2800 return JNI_ENOMEM;
2801 }
2802 #else
2803 jio_fprintf(defaultStream::output_stream(),
2804 "-Dcom.sun.management is not supported in this VM.\n");
2805 return JNI_ERR;
2806 #endif
2807 }
2808 // -Xint
2809 } else if (match_option(option, "-Xint")) {
2810 set_mode_flags(_int);
2811 // -Xmixed
2812 } else if (match_option(option, "-Xmixed")) {
2813 set_mode_flags(_mixed);
2814 // -Xcomp
2815 } else if (match_option(option, "-Xcomp")) {
2816 // for testing the compiler; turn off all flags that inhibit compilation
2817 set_mode_flags(_comp);
2818 // -Xshare:dump
2819 } else if (match_option(option, "-Xshare:dump")) {
2820 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2821 return JNI_EINVAL;
2822 }
2823 // -Xshare:on
2824 } else if (match_option(option, "-Xshare:on")) {
2825 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2832 } else if (match_option(option, "-Xshare:auto")) {
2833 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2834 return JNI_EINVAL;
2835 }
2836 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2837 return JNI_EINVAL;
2838 }
2839 // -Xshare:off
2840 } else if (match_option(option, "-Xshare:off")) {
2841 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2842 return JNI_EINVAL;
2843 }
2844 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2845 return JNI_EINVAL;
2846 }
2847 // -Xverify
2848 } else if (match_option(option, "-Xverify", &tail)) {
2849 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2850 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2851 return JNI_EINVAL;
2852 }
2853 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 } else if (strcmp(tail, ":remote") == 0) {
2857 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2858 return JNI_EINVAL;
2859 }
2860 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2861 return JNI_EINVAL;
2862 }
2863 } else if (strcmp(tail, ":none") == 0) {
2864 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2865 return JNI_EINVAL;
2866 }
2867 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2871 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2872 return JNI_EINVAL;
2873 }
2874 // -Xdebug
2875 } else if (match_option(option, "-Xdebug")) {
2876 // note this flag has been used, then ignore
2877 set_xdebug_mode(true);
2878 // -Xnoagent
2879 } else if (match_option(option, "-Xnoagent")) {
2880 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2881 } else if (match_option(option, "-Xloggc:", &tail)) {
2882 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2883 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2884 _gc_log_filename = os::strdup_check_oom(tail);
2885 } else if (match_option(option, "-Xlog", &tail)) {
2886 bool ret = false;
2887 if (strcmp(tail, ":help") == 0) {
2888 fileStream stream(defaultStream::output_stream());
2889 LogConfiguration::print_command_line_help(&stream);
2890 vm_exit(0);
2891 } else if (strcmp(tail, ":disable") == 0) {
2892 LogConfiguration::disable_logging();
2893 ret = true;
2894 } else if (*tail == '\0') {
2895 ret = LogConfiguration::parse_command_line_arguments();
2896 assert(ret, "-Xlog without arguments should never fail to parse");
2897 } else if (*tail == ':') {
2898 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2899 }
2900 if (ret == false) {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2903 tail);
2904 return JNI_EINVAL;
2905 }
2906 // JNI hooks
2907 } else if (match_option(option, "-Xcheck", &tail)) {
2908 if (!strcmp(tail, ":jni")) {
2909 #if !INCLUDE_JNI_CHECK
2910 warning("JNI CHECKING is not supported in this VM");
2911 #else
2912 CheckJNICalls = true;
2913 #endif // INCLUDE_JNI_CHECK
2914 } else if (is_bad_option(option, args->ignoreUnrecognized,
2915 "check")) {
2916 return JNI_EINVAL;
2917 }
2918 } else if (match_option(option, "vfprintf")) {
2919 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2920 } else if (match_option(option, "exit")) {
2921 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2922 } else if (match_option(option, "abort")) {
2923 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2924 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2925 // and the last option wins.
2926 } else if (match_option(option, "-XX:+NeverTenure")) {
2927 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2928 return JNI_EINVAL;
2929 }
2930 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2931 return JNI_EINVAL;
2932 }
2933 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2934 return JNI_EINVAL;
2935 }
2936 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2937 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2947 uintx max_tenuring_thresh = 0;
2948 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2949 jio_fprintf(defaultStream::error_stream(),
2950 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2951 return JNI_EINVAL;
2952 }
2953
2954 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2955 return JNI_EINVAL;
2956 }
2957
2958 if (MaxTenuringThreshold == 0) {
2959 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2963 return JNI_EINVAL;
2964 }
2965 } else {
2966 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2967 return JNI_EINVAL;
2968 }
2969 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2970 return JNI_EINVAL;
2971 }
2972 }
2973 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2974 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2975 return JNI_EINVAL;
2976 }
2977 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2978 return JNI_EINVAL;
2979 }
2980 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2981 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2982 return JNI_EINVAL;
2983 }
2984 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2985 return JNI_EINVAL;
2986 }
2987 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2988 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2989 return JNI_EINVAL;
2990 }
2991 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2992 return JNI_EINVAL;
2993 }
2994 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2995 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2996 return JNI_EINVAL;
2997 }
2998 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2999 return JNI_EINVAL;
3000 }
3001 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3002 #if defined(DTRACE_ENABLED)
3003 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
3007 return JNI_EINVAL;
3008 }
3009 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
3010 return JNI_EINVAL;
3011 }
3012 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 #else // defined(DTRACE_ENABLED)
3016 jio_fprintf(defaultStream::error_stream(),
3017 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3018 return JNI_EINVAL;
3019 #endif // defined(DTRACE_ENABLED)
3020 #ifdef ASSERT
3021 } else if (match_option(option, "-XX:+FullGCALot")) {
3022 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
3023 return JNI_EINVAL;
3024 }
3025 // disable scavenge before parallel mark-compact
3026 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
3027 return JNI_EINVAL;
3028 }
3029 #endif
3030 #if !INCLUDE_MANAGEMENT
3031 } else if (match_option(option, "-XX:+ManagementServer")) {
3032 jio_fprintf(defaultStream::error_stream(),
3033 "ManagementServer is not supported in this VM.\n");
3034 return JNI_ERR;
3035 #endif // INCLUDE_MANAGEMENT
3036 #if INCLUDE_JVMCI
3037 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
3038 if (EnableJVMCIProduct) {
3039 jio_fprintf(defaultStream::error_stream(),
3040 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
3041 return JNI_EINVAL;
3042 }
3043 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
3044 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
3045 if (EnableJVMCIProduct) {
3046 continue;
3047 }
3048 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
3049 // Allow this flag if it has been unlocked.
3050 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
3051 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
3052 jio_fprintf(defaultStream::error_stream(),
3053 "Unable to enable JVMCI in product mode");
3054 return JNI_ERR;
3055 }
3056 }
3057 // The flag was locked so process normally to report that error
3058 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
3059 return JNI_EINVAL;
3060 }
3061 #endif // INCLUDE_JVMCI
3062 #if INCLUDE_JFR
3063 } else if (match_jfr_option(&option)) {
3064 return JNI_EINVAL;
3065 #endif
3066 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3067 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3068 // already been handled
3069 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3070 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3071 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3072 return JNI_EINVAL;
3073 }
3074 }
3075 // Unknown option
3076 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3077 return JNI_ERR;
3078 }
3079 }
3080
3081 // PrintSharedArchiveAndExit will turn on
3082 // -Xshare:on
3083 // -Xlog:class+path=info
3084 if (PrintSharedArchiveAndExit) {
3085 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3086 return JNI_EINVAL;
3087 }
3088 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3089 return JNI_EINVAL;
3090 }
3091 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3092 }
3093
3094 fix_appclasspath();
3095
3096 return JNI_OK;
3097 }
3098
3099 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3100 // For java.base check for duplicate --patch-module options being specified on the command line.
3101 // This check is only required for java.base, all other duplicate module specifications
3102 // will be checked during module system initialization. The module system initialization
3103 // will throw an ExceptionInInitializerError if this situation occurs.
3104 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3105 if (*patch_mod_javabase) {
3106 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3107 } else {
3108 *patch_mod_javabase = true;
3109 }
3110 }
3111
3112 // Create GrowableArray lazily, only if --patch-module has been specified
3113 if (_patch_mod_prefix == NULL) {
3114 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
3115 }
3116
3117 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3118 }
3119
3120 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3121 //
3122 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3123 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3124 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3125 // path is treated as the current directory.
3126 //
3127 // This causes problems with CDS, which requires that all directories specified in the classpath
3128 // must be empty. In most cases, applications do NOT want to load classes from the current
3129 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3130 // scripts compatible with CDS.
3131 void Arguments::fix_appclasspath() {
3132 if (IgnoreEmptyClassPaths) {
3133 const char separator = *os::path_separator();
3134 const char* src = _java_class_path->value();
3135
3136 // skip over all the leading empty paths
3137 while (*src == separator) {
3138 src ++;
3139 }
3140
3141 char* copy = os::strdup_check_oom(src, mtArguments);
3142
3143 // trim all trailing empty paths
3144 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3145 *tail = '\0';
3146 }
3147
3148 char from[3] = {separator, separator, '\0'};
3149 char to [2] = {separator, '\0'};
3150 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3151 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3152 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3153 }
3154
3155 _java_class_path->set_writeable_value(copy);
3156 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3157 }
3158 }
3159
3160 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3161 // check if the default lib/endorsed directory exists; if so, error
3162 char path[JVM_MAXPATHLEN];
3163 const char* fileSep = os::file_separator();
3164 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3165
3166 DIR* dir = os::opendir(path);
3167 if (dir != NULL) {
3168 jio_fprintf(defaultStream::output_stream(),
3169 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3170 "in modular form will be supported via the concept of upgradeable modules.\n");
3171 os::closedir(dir);
3172 return JNI_ERR;
3173 }
3174
3175 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3176 dir = os::opendir(path);
3177 if (dir != NULL) {
3178 jio_fprintf(defaultStream::output_stream(),
3179 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3180 "Use -classpath instead.\n.");
3181 os::closedir(dir);
3182 return JNI_ERR;
3183 }
3184
3185 // This must be done after all arguments have been processed
3186 // and the container support has been initialized since AggressiveHeap
3187 // relies on the amount of total memory available.
3188 if (AggressiveHeap) {
3189 jint result = set_aggressive_heap_flags();
3190 if (result != JNI_OK) {
3191 return result;
3192 }
3193 }
3194
3195 // This must be done after all arguments have been processed.
3196 // java_compiler() true means set to "NONE" or empty.
3197 if (java_compiler() && !xdebug_mode()) {
3198 // For backwards compatibility, we switch to interpreted mode if
3199 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3200 // not specified.
3201 set_mode_flags(_int);
3202 }
3203
3204 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3205 // but like -Xint, leave compilation thresholds unaffected.
3206 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3207 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3208 set_mode_flags(_int);
3209 }
3210
3211 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3212 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3213 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3214 }
3215
3216 #if !COMPILER2_OR_JVMCI
3217 // Don't degrade server performance for footprint
3218 if (FLAG_IS_DEFAULT(UseLargePages) &&
3219 MaxHeapSize < LargePageHeapSizeThreshold) {
3220 // No need for large granularity pages w/small heaps.
3221 // Note that large pages are enabled/disabled for both the
3222 // Java heap and the code cache.
3223 FLAG_SET_DEFAULT(UseLargePages, false);
3224 }
3225
3226 UNSUPPORTED_OPTION(ProfileInterpreter);
3227 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3228 #endif
3229
3230
3231 #ifdef TIERED
3232 // Parse the CompilationMode flag
3233 if (!CompilationModeFlag::initialize()) {
3234 return JNI_ERR;
3235 }
3236 #else
3237 // Tiered compilation is undefined.
3238 UNSUPPORTED_OPTION(TieredCompilation);
3239 #endif
3240
3241 if (!check_vm_args_consistency()) {
3242 return JNI_ERR;
3243 }
3244
3245 #if INCLUDE_CDS
3246 if (DumpSharedSpaces) {
3247 // Disable biased locking now as it interferes with the clean up of
3248 // the archived Klasses and Java string objects (at dump time only).
3249 UseBiasedLocking = false;
3250
3251 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3252 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3253 // compiler just to be safe.
3254 //
3255 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3256 // instead of modifying them in place. The copy is inaccessible to the compiler.
3257 // TODO: revisit the following for the static archive case.
3258 set_mode_flags(_int);
3259 }
3260 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3261 // Always verify non-system classes during CDS dump
3262 if (!BytecodeVerificationRemote) {
3263 BytecodeVerificationRemote = true;
3264 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3265 }
3266 }
3267 if (ArchiveClassesAtExit == NULL) {
3268 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3269 }
3270 if (UseSharedSpaces && patch_mod_javabase) {
3271 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3272 }
3273 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3274 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3275 }
3276 #endif
3277
3278 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3279 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3280 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3281
3282 return JNI_OK;
3283 }
3284
3285 // Helper class for controlling the lifetime of JavaVMInitArgs
3286 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3287 // deleted on the destruction of the ScopedVMInitArgs object.
3288 class ScopedVMInitArgs : public StackObj {
3289 private:
3290 JavaVMInitArgs _args;
3291 char* _container_name;
3292 bool _is_set;
3293 char* _vm_options_file_arg;
3294
3295 public:
3296 ScopedVMInitArgs(const char *container_name) {
3297 _args.version = JNI_VERSION_1_2;
3298 _args.nOptions = 0;
3299 _args.options = NULL;
3300 _args.ignoreUnrecognized = false;
3301 _container_name = (char *)container_name;
3302 _is_set = false;
3303 _vm_options_file_arg = NULL;
3304 }
3305
3306 // Populates the JavaVMInitArgs object represented by this
3307 // ScopedVMInitArgs object with the arguments in options. The
3308 // allocated memory is deleted by the destructor. If this method
3309 // returns anything other than JNI_OK, then this object is in a
3310 // partially constructed state, and should be abandoned.
3311 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3312 _is_set = true;
3313 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3314 JavaVMOption, options->length(), mtArguments);
3315 if (options_arr == NULL) {
3316 return JNI_ENOMEM;
3317 }
3318 _args.options = options_arr;
3319
3320 for (int i = 0; i < options->length(); i++) {
3321 options_arr[i] = options->at(i);
3322 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3323 if (options_arr[i].optionString == NULL) {
3324 // Rely on the destructor to do cleanup.
3325 _args.nOptions = i;
3326 return JNI_ENOMEM;
3327 }
3328 }
3329
3330 _args.nOptions = options->length();
3331 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3332 return JNI_OK;
3333 }
3334
3335 JavaVMInitArgs* get() { return &_args; }
3336 char* container_name() { return _container_name; }
3337 bool is_set() { return _is_set; }
3338 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3339 char* vm_options_file_arg() { return _vm_options_file_arg; }
3340
3341 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3342 if (_vm_options_file_arg != NULL) {
3343 os::free(_vm_options_file_arg);
3344 }
3345 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3346 }
3347
3348 ~ScopedVMInitArgs() {
3349 if (_vm_options_file_arg != NULL) {
3350 os::free(_vm_options_file_arg);
3351 }
3352 if (_args.options == NULL) return;
3353 for (int i = 0; i < _args.nOptions; i++) {
3354 os::free(_args.options[i].optionString);
3355 }
3356 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3357 }
3358
3359 // Insert options into this option list, to replace option at
3360 // vm_options_file_pos (-XX:VMOptionsFile)
3361 jint insert(const JavaVMInitArgs* args,
3362 const JavaVMInitArgs* args_to_insert,
3363 const int vm_options_file_pos) {
3364 assert(_args.options == NULL, "shouldn't be set yet");
3365 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3366 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3367
3368 int length = args->nOptions + args_to_insert->nOptions - 1;
3369 // Construct new option array
3370 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3371 for (int i = 0; i < args->nOptions; i++) {
3372 if (i == vm_options_file_pos) {
3373 // insert the new options starting at the same place as the
3374 // -XX:VMOptionsFile option
3375 for (int j = 0; j < args_to_insert->nOptions; j++) {
3376 options.push(args_to_insert->options[j]);
3377 }
3378 } else {
3379 options.push(args->options[i]);
3380 }
3381 }
3382 // make into options array
3383 return set_args(&options);
3384 }
3385 };
3386
3387 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3388 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3389 }
3390
3391 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3392 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3393 }
3394
3395 jint Arguments::parse_options_environment_variable(const char* name,
3396 ScopedVMInitArgs* vm_args) {
3397 char *buffer = ::getenv(name);
3398
3399 // Don't check this environment variable if user has special privileges
3400 // (e.g. unix su command).
3401 if (buffer == NULL || os::have_special_privileges()) {
3402 return JNI_OK;
3403 }
3404
3405 if ((buffer = os::strdup(buffer)) == NULL) {
3406 return JNI_ENOMEM;
3407 }
3408
3409 jio_fprintf(defaultStream::error_stream(),
3410 "Picked up %s: %s\n", name, buffer);
3411
3412 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3413
3414 os::free(buffer);
3415 return retcode;
3416 }
3417
3418 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3419 // read file into buffer
3420 int fd = ::open(file_name, O_RDONLY);
3421 if (fd < 0) {
3422 jio_fprintf(defaultStream::error_stream(),
3423 "Could not open options file '%s'\n",
3424 file_name);
3425 return JNI_ERR;
3426 }
3427
3428 struct stat stbuf;
3429 int retcode = os::stat(file_name, &stbuf);
3430 if (retcode != 0) {
3431 jio_fprintf(defaultStream::error_stream(),
3432 "Could not stat options file '%s'\n",
3433 file_name);
3434 os::close(fd);
3435 return JNI_ERR;
3436 }
3437
3438 if (stbuf.st_size == 0) {
3439 // tell caller there is no option data and that is ok
3440 os::close(fd);
3441 return JNI_OK;
3442 }
3443
3444 // '+ 1' for NULL termination even with max bytes
3445 size_t bytes_alloc = stbuf.st_size + 1;
3446
3447 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3448 if (NULL == buf) {
3449 jio_fprintf(defaultStream::error_stream(),
3450 "Could not allocate read buffer for options file parse\n");
3451 os::close(fd);
3452 return JNI_ENOMEM;
3453 }
3454
3455 memset(buf, 0, bytes_alloc);
3456
3457 // Fill buffer
3458 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3459 os::close(fd);
3460 if (bytes_read < 0) {
3461 FREE_C_HEAP_ARRAY(char, buf);
3462 jio_fprintf(defaultStream::error_stream(),
3463 "Could not read options file '%s'\n", file_name);
3464 return JNI_ERR;
3465 }
3466
3467 if (bytes_read == 0) {
3468 // tell caller there is no option data and that is ok
3469 FREE_C_HEAP_ARRAY(char, buf);
3470 return JNI_OK;
3471 }
3472
3473 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3474
3475 FREE_C_HEAP_ARRAY(char, buf);
3476 return retcode;
3477 }
3478
3479 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3480 // Construct option array
3481 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3482
3483 // some pointers to help with parsing
3484 char *buffer_end = buffer + buf_len;
3485 char *opt_hd = buffer;
3486 char *wrt = buffer;
3487 char *rd = buffer;
3488
3489 // parse all options
3490 while (rd < buffer_end) {
3491 // skip leading white space from the input string
3492 while (rd < buffer_end && isspace(*rd)) {
3493 rd++;
3494 }
3495
3496 if (rd >= buffer_end) {
3497 break;
3498 }
3499
3500 // Remember this is where we found the head of the token.
3501 opt_hd = wrt;
3502
3503 // Tokens are strings of non white space characters separated
3504 // by one or more white spaces.
3505 while (rd < buffer_end && !isspace(*rd)) {
3506 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3507 int quote = *rd; // matching quote to look for
3508 rd++; // don't copy open quote
3509 while (rd < buffer_end && *rd != quote) {
3510 // include everything (even spaces)
3511 // up until the close quote
3512 *wrt++ = *rd++; // copy to option string
3513 }
3514
3515 if (rd < buffer_end) {
3516 rd++; // don't copy close quote
3517 } else {
3518 // did not see closing quote
3519 jio_fprintf(defaultStream::error_stream(),
3520 "Unmatched quote in %s\n", name);
3521 return JNI_ERR;
3522 }
3523 } else {
3524 *wrt++ = *rd++; // copy to option string
3525 }
3526 }
3527
3528 // steal a white space character and set it to NULL
3529 *wrt++ = '\0';
3530 // We now have a complete token
3531
3532 JavaVMOption option;
3533 option.optionString = opt_hd;
3534 option.extraInfo = NULL;
3535
3536 options.append(option); // Fill in option
3537
3538 rd++; // Advance to next character
3539 }
3540
3541 // Fill out JavaVMInitArgs structure.
3542 return vm_args->set_args(&options);
3543 }
3544
3545 jint Arguments::set_shared_spaces_flags_and_archive_paths() {
3546 if (DumpSharedSpaces) {
3547 if (RequireSharedSpaces) {
3548 warning("Cannot dump shared archive while using shared archive");
3549 }
3550 UseSharedSpaces = false;
3551 }
3552 #if INCLUDE_CDS
3553 // Initialize shared archive paths which could include both base and dynamic archive paths
3554 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3555 if (!init_shared_archive_paths()) {
3556 return JNI_ENOMEM;
3557 }
3558 #endif // INCLUDE_CDS
3559 return JNI_OK;
3560 }
3561
3562 #if INCLUDE_CDS
3563 // Sharing support
3564 // Construct the path to the archive
3565 char* Arguments::get_default_shared_archive_path() {
3566 char *default_archive_path;
3567 char jvm_path[JVM_MAXPATHLEN];
3568 os::jvm_path(jvm_path, sizeof(jvm_path));
3569 char *end = strrchr(jvm_path, *os::file_separator());
3570 if (end != NULL) *end = '\0';
3571 size_t jvm_path_len = strlen(jvm_path);
3572 size_t file_sep_len = strlen(os::file_separator());
3573 const size_t len = jvm_path_len + file_sep_len + 20;
3574 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3575 jio_snprintf(default_archive_path, len,
3576 UseCompressedOops ? "%s%sclasses.jsa": "%s%sclasses_nocoops.jsa",
3577 jvm_path, os::file_separator());
3578 return default_archive_path;
3579 }
3580
3581 int Arguments::num_archives(const char* archive_path) {
3582 if (archive_path == NULL) {
3583 return 0;
3584 }
3585 int npaths = 1;
3586 char* p = (char*)archive_path;
3587 while (*p != '\0') {
3588 if (*p == os::path_separator()[0]) {
3589 npaths++;
3590 }
3591 p++;
3592 }
3593 return npaths;
3594 }
3595
3596 void Arguments::extract_shared_archive_paths(const char* archive_path,
3597 char** base_archive_path,
3598 char** top_archive_path) {
3599 char* begin_ptr = (char*)archive_path;
3600 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3601 if (end_ptr == NULL || end_ptr == begin_ptr) {
3602 vm_exit_during_initialization("Base archive was not specified", archive_path);
3603 }
3604 size_t len = end_ptr - begin_ptr;
3605 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3606 strncpy(cur_path, begin_ptr, len);
3607 cur_path[len] = '\0';
3608 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3609 *base_archive_path = cur_path;
3610
3611 begin_ptr = ++end_ptr;
3612 if (*begin_ptr == '\0') {
3613 vm_exit_during_initialization("Top archive was not specified", archive_path);
3614 }
3615 end_ptr = strchr(begin_ptr, '\0');
3616 assert(end_ptr != NULL, "sanity");
3617 len = end_ptr - begin_ptr;
3618 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3619 strncpy(cur_path, begin_ptr, len + 1);
3620 //cur_path[len] = '\0';
3621 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3622 *top_archive_path = cur_path;
3623 }
3624
3625 bool Arguments::init_shared_archive_paths() {
3626 if (ArchiveClassesAtExit != NULL) {
3627 if (DumpSharedSpaces) {
3628 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3629 }
3630 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3631 return false;
3632 }
3633 check_unsupported_dumping_properties();
3634 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3635 }
3636 if (SharedArchiveFile == NULL) {
3637 SharedArchivePath = get_default_shared_archive_path();
3638 } else {
3639 int archives = num_archives(SharedArchiveFile);
3640 if (is_dumping_archive()) {
3641 if (archives > 1) {
3642 vm_exit_during_initialization(
3643 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3644 }
3645 if (DynamicDumpSharedSpaces) {
3646 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3647 vm_exit_during_initialization(
3648 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3649 SharedArchiveFile);
3650 }
3651 }
3652 }
3653 if (!is_dumping_archive()){
3654 if (archives > 2) {
3655 vm_exit_during_initialization(
3656 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3657 }
3658 if (archives == 1) {
3659 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3660 int name_size;
3661 bool success =
3662 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3663 if (!success) {
3664 SharedArchivePath = temp_archive_path;
3665 } else {
3666 SharedDynamicArchivePath = temp_archive_path;
3667 }
3668 } else {
3669 extract_shared_archive_paths((const char*)SharedArchiveFile,
3670 &SharedArchivePath, &SharedDynamicArchivePath);
3671 }
3672 } else { // CDS dumping
3673 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3674 }
3675 }
3676 return (SharedArchivePath != NULL);
3677 }
3678 #endif // INCLUDE_CDS
3679
3680 #ifndef PRODUCT
3681 // Determine whether LogVMOutput should be implicitly turned on.
3682 static bool use_vm_log() {
3683 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3684 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3685 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3686 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3687 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3688 return true;
3689 }
3690
3691 #ifdef COMPILER1
3692 if (PrintC1Statistics) {
3693 return true;
3694 }
3695 #endif // COMPILER1
3696
3697 #ifdef COMPILER2
3698 if (PrintOptoAssembly || PrintOptoStatistics) {
3699 return true;
3700 }
3701 #endif // COMPILER2
3702
3703 return false;
3704 }
3705
3706 #endif // PRODUCT
3707
3708 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3709 for (int index = 0; index < args->nOptions; index++) {
3710 const JavaVMOption* option = args->options + index;
3711 const char* tail;
3712 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3713 return true;
3714 }
3715 }
3716 return false;
3717 }
3718
3719 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3720 const char* vm_options_file,
3721 const int vm_options_file_pos,
3722 ScopedVMInitArgs* vm_options_file_args,
3723 ScopedVMInitArgs* args_out) {
3724 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3725 if (code != JNI_OK) {
3726 return code;
3727 }
3728
3729 if (vm_options_file_args->get()->nOptions < 1) {
3730 return JNI_OK;
3731 }
3732
3733 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3734 jio_fprintf(defaultStream::error_stream(),
3735 "A VM options file may not refer to a VM options file. "
3736 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3737 "options file '%s' in options container '%s' is an error.\n",
3738 vm_options_file_args->vm_options_file_arg(),
3739 vm_options_file_args->container_name());
3740 return JNI_EINVAL;
3741 }
3742
3743 return args_out->insert(args, vm_options_file_args->get(),
3744 vm_options_file_pos);
3745 }
3746
3747 // Expand -XX:VMOptionsFile found in args_in as needed.
3748 // mod_args and args_out parameters may return values as needed.
3749 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3750 ScopedVMInitArgs* mod_args,
3751 JavaVMInitArgs** args_out) {
3752 jint code = match_special_option_and_act(args_in, mod_args);
3753 if (code != JNI_OK) {
3754 return code;
3755 }
3756
3757 if (mod_args->is_set()) {
3758 // args_in contains -XX:VMOptionsFile and mod_args contains the
3759 // original options from args_in along with the options expanded
3760 // from the VMOptionsFile. Return a short-hand to the caller.
3761 *args_out = mod_args->get();
3762 } else {
3763 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3764 }
3765 return JNI_OK;
3766 }
3767
3768 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3769 ScopedVMInitArgs* args_out) {
3770 // Remaining part of option string
3771 const char* tail;
3772 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3773
3774 for (int index = 0; index < args->nOptions; index++) {
3775 const JavaVMOption* option = args->options + index;
3776 if (match_option(option, "-XX:Flags=", &tail)) {
3777 Arguments::set_jvm_flags_file(tail);
3778 continue;
3779 }
3780 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3781 if (vm_options_file_args.found_vm_options_file_arg()) {
3782 jio_fprintf(defaultStream::error_stream(),
3783 "The option '%s' is already specified in the options "
3784 "container '%s' so the specification of '%s' in the "
3785 "same options container is an error.\n",
3786 vm_options_file_args.vm_options_file_arg(),
3787 vm_options_file_args.container_name(),
3788 option->optionString);
3789 return JNI_EINVAL;
3790 }
3791 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3792 // If there's a VMOptionsFile, parse that
3793 jint code = insert_vm_options_file(args, tail, index,
3794 &vm_options_file_args, args_out);
3795 if (code != JNI_OK) {
3796 return code;
3797 }
3798 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3799 if (args_out->is_set()) {
3800 // The VMOptions file inserted some options so switch 'args'
3801 // to the new set of options, and continue processing which
3802 // preserves "last option wins" semantics.
3803 args = args_out->get();
3804 // The first option from the VMOptionsFile replaces the
3805 // current option. So we back track to process the
3806 // replacement option.
3807 index--;
3808 }
3809 continue;
3810 }
3811 if (match_option(option, "-XX:+PrintVMOptions")) {
3812 PrintVMOptions = true;
3813 continue;
3814 }
3815 if (match_option(option, "-XX:-PrintVMOptions")) {
3816 PrintVMOptions = false;
3817 continue;
3818 }
3819 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3820 IgnoreUnrecognizedVMOptions = true;
3821 continue;
3822 }
3823 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3824 IgnoreUnrecognizedVMOptions = false;
3825 continue;
3826 }
3827 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3828 JVMFlag::printFlags(tty, false);
3829 vm_exit(0);
3830 }
3831 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3832 #if INCLUDE_NMT
3833 // The launcher did not setup nmt environment variable properly.
3834 if (!MemTracker::check_launcher_nmt_support(tail)) {
3835 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3836 }
3837
3838 // Verify if nmt option is valid.
3839 if (MemTracker::verify_nmt_option()) {
3840 // Late initialization, still in single-threaded mode.
3841 if (MemTracker::tracking_level() >= NMT_summary) {
3842 MemTracker::init();
3843 }
3844 } else {
3845 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3846 }
3847 continue;
3848 #else
3849 jio_fprintf(defaultStream::error_stream(),
3850 "Native Memory Tracking is not supported in this VM\n");
3851 return JNI_ERR;
3852 #endif
3853 }
3854
3855 #ifndef PRODUCT
3856 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3857 JVMFlag::printFlags(tty, true);
3858 vm_exit(0);
3859 }
3860 #endif
3861 }
3862 return JNI_OK;
3863 }
3864
3865 static void print_options(const JavaVMInitArgs *args) {
3866 const char* tail;
3867 for (int index = 0; index < args->nOptions; index++) {
3868 const JavaVMOption *option = args->options + index;
3869 if (match_option(option, "-XX:", &tail)) {
3870 logOption(tail);
3871 }
3872 }
3873 }
3874
3875 bool Arguments::handle_deprecated_print_gc_flags() {
3876 if (PrintGC) {
3877 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3878 }
3879 if (PrintGCDetails) {
3880 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3881 }
3882
3883 if (_gc_log_filename != NULL) {
3884 // -Xloggc was used to specify a filename
3885 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3886
3887 LogTarget(Error, logging) target;
3888 LogStream errstream(target);
3889 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3890 } else if (PrintGC || PrintGCDetails) {
3891 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3892 }
3893 return true;
3894 }
3895
3896 // Parse entry point called from JNI_CreateJavaVM
3897
3898 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3899 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3900
3901 // Initialize ranges and constraints
3902 JVMFlagRangeList::init();
3903 JVMFlagConstraintList::init();
3904
3905 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3906 const char* hotspotrc = ".hotspotrc";
3907 bool settings_file_specified = false;
3908 bool needs_hotspotrc_warning = false;
3909 ScopedVMInitArgs initial_vm_options_args("");
3910 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3911 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3912
3913 // Pointers to current working set of containers
3914 JavaVMInitArgs* cur_cmd_args;
3915 JavaVMInitArgs* cur_vm_options_args;
3916 JavaVMInitArgs* cur_java_options_args;
3917 JavaVMInitArgs* cur_java_tool_options_args;
3918
3919 // Containers for modified/expanded options
3920 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3921 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3922 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3923 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3924
3925
3926 jint code =
3927 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3928 if (code != JNI_OK) {
3929 return code;
3930 }
3931
3932 code = parse_java_options_environment_variable(&initial_java_options_args);
3933 if (code != JNI_OK) {
3934 return code;
3935 }
3936
3937 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3938 char *vmoptions = ClassLoader::lookup_vm_options();
3939 if (vmoptions != NULL) {
3940 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3941 FREE_C_HEAP_ARRAY(char, vmoptions);
3942 if (code != JNI_OK) {
3943 return code;
3944 }
3945 }
3946
3947 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3948 &mod_java_tool_options_args,
3949 &cur_java_tool_options_args);
3950 if (code != JNI_OK) {
3951 return code;
3952 }
3953
3954 code = expand_vm_options_as_needed(initial_cmd_args,
3955 &mod_cmd_args,
3956 &cur_cmd_args);
3957 if (code != JNI_OK) {
3958 return code;
3959 }
3960
3961 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3962 &mod_java_options_args,
3963 &cur_java_options_args);
3964 if (code != JNI_OK) {
3965 return code;
3966 }
3967
3968 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3969 &mod_vm_options_args,
3970 &cur_vm_options_args);
3971 if (code != JNI_OK) {
3972 return code;
3973 }
3974
3975 const char* flags_file = Arguments::get_jvm_flags_file();
3976 settings_file_specified = (flags_file != NULL);
3977
3978 if (IgnoreUnrecognizedVMOptions) {
3979 cur_cmd_args->ignoreUnrecognized = true;
3980 cur_java_tool_options_args->ignoreUnrecognized = true;
3981 cur_java_options_args->ignoreUnrecognized = true;
3982 }
3983
3984 // Parse specified settings file
3985 if (settings_file_specified) {
3986 if (!process_settings_file(flags_file, true,
3987 cur_cmd_args->ignoreUnrecognized)) {
3988 return JNI_EINVAL;
3989 }
3990 } else {
3991 #ifdef ASSERT
3992 // Parse default .hotspotrc settings file
3993 if (!process_settings_file(".hotspotrc", false,
3994 cur_cmd_args->ignoreUnrecognized)) {
3995 return JNI_EINVAL;
3996 }
3997 #else
3998 struct stat buf;
3999 if (os::stat(hotspotrc, &buf) == 0) {
4000 needs_hotspotrc_warning = true;
4001 }
4002 #endif
4003 }
4004
4005 if (PrintVMOptions) {
4006 print_options(cur_java_tool_options_args);
4007 print_options(cur_cmd_args);
4008 print_options(cur_java_options_args);
4009 }
4010
4011 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4012 jint result = parse_vm_init_args(cur_vm_options_args,
4013 cur_java_tool_options_args,
4014 cur_java_options_args,
4015 cur_cmd_args);
4016
4017 if (result != JNI_OK) {
4018 return result;
4019 }
4020
4021 // Delay warning until here so that we've had a chance to process
4022 // the -XX:-PrintWarnings flag
4023 if (needs_hotspotrc_warning) {
4024 warning("%s file is present but has been ignored. "
4025 "Run with -XX:Flags=%s to load the file.",
4026 hotspotrc, hotspotrc);
4027 }
4028
4029 if (needs_module_property_warning) {
4030 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4031 " names that are reserved for internal use.");
4032 }
4033
4034 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4035 UNSUPPORTED_OPTION(UseLargePages);
4036 #endif
4037
4038 #if defined(AIX)
4039 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
4040 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
4041 #endif
4042
4043 #ifndef PRODUCT
4044 if (TraceBytecodesAt != 0) {
4045 TraceBytecodes = true;
4046 }
4047 if (CountCompiledCalls) {
4048 if (UseCounterDecay) {
4049 warning("UseCounterDecay disabled because CountCalls is set");
4050 UseCounterDecay = false;
4051 }
4052 }
4053 #endif // PRODUCT
4054
4055 if (ScavengeRootsInCode == 0) {
4056 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4057 warning("Forcing ScavengeRootsInCode non-zero");
4058 }
4059 ScavengeRootsInCode = 1;
4060 }
4061
4062 if (!handle_deprecated_print_gc_flags()) {
4063 return JNI_EINVAL;
4064 }
4065
4066 // Set object alignment values.
4067 set_object_alignment();
4068
4069 #if !INCLUDE_CDS
4070 if (DumpSharedSpaces || RequireSharedSpaces) {
4071 jio_fprintf(defaultStream::error_stream(),
4072 "Shared spaces are not supported in this VM\n");
4073 return JNI_ERR;
4074 }
4075 if (DumpLoadedClassList != NULL) {
4076 jio_fprintf(defaultStream::error_stream(),
4077 "DumpLoadedClassList is not supported in this VM\n");
4078 return JNI_ERR;
4079 }
4080 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4081 log_is_enabled(Info, cds)) {
4082 warning("Shared spaces are not supported in this VM");
4083 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4084 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4085 }
4086 no_shared_spaces("CDS Disabled");
4087 #endif // INCLUDE_CDS
4088
4089 #ifndef TIERED
4090 if (FLAG_IS_CMDLINE(CompilationMode)) {
4091 warning("CompilationMode has no effect in non-tiered VMs");
4092 }
4093 #endif
4094
4095 return JNI_OK;
4096 }
4097
4098 jint Arguments::apply_ergo() {
4099 // Set flags based on ergonomics.
4100 jint result = set_ergonomics_flags();
4101 if (result != JNI_OK) return result;
4102
4103 // Set heap size based on available physical memory
4104 set_heap_size();
4105
4106 GCConfig::arguments()->initialize();
4107
4108 result = set_shared_spaces_flags_and_archive_paths();
4109 if (result != JNI_OK) return result;
4110
4111 // Initialize Metaspace flags and alignments
4112 Metaspace::ergo_initialize();
4113
4114 // Set compiler flags after GC is selected and GC specific
4115 // flags (LoopStripMiningIter) are set.
4116 CompilerConfig::ergo_initialize();
4117
4118 // Set bytecode rewriting flags
4119 set_bytecode_flags();
4120
4121 // Set flags if aggressive optimization flags are enabled
4122 jint code = set_aggressive_opts_flags();
4123 if (code != JNI_OK) {
4124 return code;
4125 }
4126
4127 // Turn off biased locking for locking debug mode flags,
4128 // which are subtly different from each other but neither works with
4129 // biased locking
4130 if (UseHeavyMonitors
4131 #ifdef COMPILER1
4132 || !UseFastLocking
4133 #endif // COMPILER1
4134 #if INCLUDE_JVMCI
4135 || !JVMCIUseFastLocking
4136 #endif
4137 ) {
4138 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4139 // flag set to true on command line; warn the user that they
4140 // can't enable biased locking here
4141 warning("Biased Locking is not supported with locking debug flags"
4142 "; ignoring UseBiasedLocking flag." );
4143 }
4144 UseBiasedLocking = false;
4145 }
4146
4147 #ifdef ZERO
4148 // Clear flags not supported on zero.
4149 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4150 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4151 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4152 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4153 #endif // ZERO
4154
4155 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4156 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4157 DebugNonSafepoints = true;
4158 }
4159
4160 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4161 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4162 }
4163
4164 // Treat the odd case where local verification is enabled but remote
4165 // verification is not as if both were enabled.
4166 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4167 log_info(verification)("Turning on remote verification because local verification is on");
4168 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4169 }
4170
4171 #ifndef PRODUCT
4172 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4173 if (use_vm_log()) {
4174 LogVMOutput = true;
4175 }
4176 }
4177 #endif // PRODUCT
4178
4179 if (PrintCommandLineFlags) {
4180 JVMFlag::printSetFlags(tty);
4181 }
4182
4183 // Apply CPU specific policy for the BiasedLocking
4184 if (UseBiasedLocking) {
4185 if (!VM_Version::use_biased_locking() &&
4186 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4187 UseBiasedLocking = false;
4188 }
4189 }
4190 #ifdef COMPILER2
4191 if (!UseBiasedLocking) {
4192 UseOptoBiasInlining = false;
4193 }
4194 #endif
4195
4196 if (FLAG_IS_CMDLINE(DiagnoseSyncOnPrimitiveWrappers)) {
4197 if (DiagnoseSyncOnPrimitiveWrappers == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, primitivewrappers)) {
4198 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(primitivewrappers));
4199 }
4200 }
4201 return JNI_OK;
4202 }
4203
4204 jint Arguments::adjust_after_os() {
4205 if (UseNUMA) {
4206 if (UseParallelGC) {
4207 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4208 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4209 }
4210 }
4211 }
4212 return JNI_OK;
4213 }
4214
4215 int Arguments::PropertyList_count(SystemProperty* pl) {
4216 int count = 0;
4217 while(pl != NULL) {
4218 count++;
4219 pl = pl->next();
4220 }
4221 return count;
4222 }
4223
4224 // Return the number of readable properties.
4225 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4226 int count = 0;
4227 while(pl != NULL) {
4228 if (pl->is_readable()) {
4229 count++;
4230 }
4231 pl = pl->next();
4232 }
4233 return count;
4234 }
4235
4236 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4237 assert(key != NULL, "just checking");
4238 SystemProperty* prop;
4239 for (prop = pl; prop != NULL; prop = prop->next()) {
4240 if (strcmp(key, prop->key()) == 0) return prop->value();
4241 }
4242 return NULL;
4243 }
4244
4245 // Return the value of the requested property provided that it is a readable property.
4246 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4247 assert(key != NULL, "just checking");
4248 SystemProperty* prop;
4249 // Return the property value if the keys match and the property is not internal or
4250 // it's the special internal property "jdk.boot.class.path.append".
4251 for (prop = pl; prop != NULL; prop = prop->next()) {
4252 if (strcmp(key, prop->key()) == 0) {
4253 if (!prop->internal()) {
4254 return prop->value();
4255 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4256 return prop->value();
4257 } else {
4258 // Property is internal and not jdk.boot.class.path.append so return NULL.
4259 return NULL;
4260 }
4261 }
4262 }
4263 return NULL;
4264 }
4265
4266 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4267 int count = 0;
4268 const char* ret_val = NULL;
4269
4270 while(pl != NULL) {
4271 if(count >= index) {
4272 ret_val = pl->key();
4273 break;
4274 }
4275 count++;
4276 pl = pl->next();
4277 }
4278
4279 return ret_val;
4280 }
4281
4282 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4283 int count = 0;
4284 char* ret_val = NULL;
4285
4286 while(pl != NULL) {
4287 if(count >= index) {
4288 ret_val = pl->value();
4289 break;
4290 }
4291 count++;
4292 pl = pl->next();
4293 }
4294
4295 return ret_val;
4296 }
4297
4298 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4299 SystemProperty* p = *plist;
4300 if (p == NULL) {
4301 *plist = new_p;
4302 } else {
4303 while (p->next() != NULL) {
4304 p = p->next();
4305 }
4306 p->set_next(new_p);
4307 }
4308 }
4309
4310 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4311 bool writeable, bool internal) {
4312 if (plist == NULL)
4313 return;
4314
4315 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4316 PropertyList_add(plist, new_p);
4317 }
4318
4319 void Arguments::PropertyList_add(SystemProperty *element) {
4320 PropertyList_add(&_system_properties, element);
4321 }
4322
4323 // This add maintains unique property key in the list.
4324 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4325 PropertyAppendable append, PropertyWriteable writeable,
4326 PropertyInternal internal) {
4327 if (plist == NULL)
4328 return;
4329
4330 // If property key exists and is writeable, then update with new value.
4331 // Trying to update a non-writeable property is silently ignored.
4332 SystemProperty* prop;
4333 for (prop = *plist; prop != NULL; prop = prop->next()) {
4334 if (strcmp(k, prop->key()) == 0) {
4335 if (append == AppendProperty) {
4336 prop->append_writeable_value(v);
4337 } else {
4338 prop->set_writeable_value(v);
4339 }
4340 return;
4341 }
4342 }
4343
4344 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4345 }
4346
4347 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4348 // Returns true if all of the source pointed by src has been copied over to
4349 // the destination buffer pointed by buf. Otherwise, returns false.
4350 // Notes:
4351 // 1. If the length (buflen) of the destination buffer excluding the
4352 // NULL terminator character is not long enough for holding the expanded
4353 // pid characters, it also returns false instead of returning the partially
4354 // expanded one.
4355 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4356 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4357 char* buf, size_t buflen) {
4358 const char* p = src;
4359 char* b = buf;
4360 const char* src_end = &src[srclen];
4361 char* buf_end = &buf[buflen - 1];
4362
4363 while (p < src_end && b < buf_end) {
4364 if (*p == '%') {
4365 switch (*(++p)) {
4366 case '%': // "%%" ==> "%"
4367 *b++ = *p++;
4368 break;
4369 case 'p': { // "%p" ==> current process id
4370 // buf_end points to the character before the last character so
4371 // that we could write '\0' to the end of the buffer.
4372 size_t buf_sz = buf_end - b + 1;
4373 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4374
4375 // if jio_snprintf fails or the buffer is not long enough to hold
4376 // the expanded pid, returns false.
4377 if (ret < 0 || ret >= (int)buf_sz) {
4378 return false;
4379 } else {
4380 b += ret;
4381 assert(*b == '\0', "fail in copy_expand_pid");
4382 if (p == src_end && b == buf_end + 1) {
4383 // reach the end of the buffer.
4384 return true;
4385 }
4386 }
4387 p++;
4388 break;
4389 }
4390 default :
4391 *b++ = '%';
4392 }
4393 } else {
4394 *b++ = *p++;
4395 }
4396 }
4397 *b = '\0';
4398 return (p == src_end); // return false if not all of the source was copied
4399 }