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 { "PrintVMQWaitTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
526 { "UseNewFieldLayout", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
527 { "ForceNUMA", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
528 { "UseBiasedLocking", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
529 { "BiasedLockingStartupDelay", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
530 { "PrintBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
531 { "BiasedLockingBulkRebiasThreshold", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
532 { "BiasedLockingBulkRevokeThreshold", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
533 { "BiasedLockingDecayTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
534 { "UseOptoBiasInlining", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
535 { "PrintPreciseBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
536 { "InitialBootClassLoaderMetaspaceSize", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
537 { "UseLargePagesInMetaspace", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
538
539 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
540 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
541 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
542 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
543
544 // -------------- Obsolete Flags - sorted by expired_in --------------
545 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
546 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
547 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
548 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
549 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
550 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
551 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
552 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
553 { "GCTaskTimeStampEntries", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
554 { "G1RSetScanBlockSize", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
555 { "UseParallelOldGC", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
556 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
557 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
558 #ifndef X86
559 { "UseSSE", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
560 #endif // !X86
561 { "UseAdaptiveGCBoundary", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
562 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
563 #ifdef AARCH64
564 { "UseBarriersForVolatile", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
565 #endif
566 { "UseLWPSynchronization", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
567 { "BranchOnRegister", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
568 { "LIRFillDelaySlots", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
569
570 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
571 // These entries will generate build errors. Their purpose is to test the macros.
572 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
573 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
574 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
575 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
576 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
577 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
578 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
579 #endif
580
581 #ifndef COMPILER2
582 // These flags were generally available, but are C2 only, now.
583 { "MaxInlineLevel", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
584 { "MaxRecursiveInlineLevel", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
585 { "InlineSmallCode", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
586 { "MaxInlineSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
587 { "FreqInlineSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
588 { "MaxTrivialSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
589 #endif
590
591 { NULL, JDK_Version(0), JDK_Version(0) }
592 };
593
594 // Flags that are aliases for other flags.
595 typedef struct {
596 const char* alias_name;
597 const char* real_name;
598 } AliasedFlag;
599
600 static AliasedFlag const aliased_jvm_flags[] = {
601 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
602 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
603 { NULL, NULL}
604 };
605
606 // NOTE: A compatibility request will be necessary for each alias to be removed.
607 static AliasedLoggingFlag const aliased_logging_flags[] = {
608 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
609 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
610 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
611 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
612 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
613 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
614 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
615 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
616 { "TraceInvokeDynamic", LogLevel::Debug, true, LOG_TAGS(methodhandles, indy) },
617 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
618 { "TraceMethodHandles", LogLevel::Info, true, LOG_TAGS(methodhandles) },
619 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
620 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
621 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
622 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
623 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) },
624 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
625 };
626
627 #ifndef PRODUCT
628 // These options are removed in jdk9. Remove this code for jdk10.
629 static AliasedFlag const removed_develop_logging_flags[] = {
630 { "TraceClassInitialization", "-Xlog:class+init" },
631 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
632 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
633 { "TraceItables", "-Xlog:itables=debug" },
634 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
635 { "TraceSafepoint", "-Xlog:safepoint=debug" },
636 { "TraceStartupTime", "-Xlog:startuptime" },
637 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
638 { "PrintVtables", "-Xlog:vtables=debug" },
639 { "VerboseVerification", "-Xlog:verification" },
640 { NULL, NULL }
641 };
642 #endif //PRODUCT
643
644 // Return true if "v" is less than "other", where "other" may be "undefined".
645 static bool version_less_than(JDK_Version v, JDK_Version other) {
646 assert(!v.is_undefined(), "must be defined");
647 if (!other.is_undefined() && v.compare(other) >= 0) {
648 return false;
649 } else {
650 return true;
651 }
652 }
653
654 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
655 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
656 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
657 flag = special_jvm_flags[i];
658 return true;
659 }
660 }
661 return false;
662 }
663
664 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
665 assert(version != NULL, "Must provide a version buffer");
666 SpecialFlag flag;
667 if (lookup_special_flag(flag_name, flag)) {
668 if (!flag.obsolete_in.is_undefined()) {
669 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
670 *version = flag.obsolete_in;
671 // This flag may have been marked for obsoletion in this version, but we may not
672 // have actually removed it yet. Rather than ignoring it as soon as we reach
673 // this version we allow some time for the removal to happen. So if the flag
674 // still actually exists we process it as normal, but issue an adjusted warning.
675 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
676 if (real_flag != NULL) {
677 char version_str[256];
678 version->to_string(version_str, sizeof(version_str));
679 warning("Temporarily processing option %s; support is scheduled for removal in %s",
680 flag_name, version_str);
681 return false;
682 }
683 return true;
684 }
685 }
686 }
687 return false;
688 }
689
690 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
691 assert(version != NULL, "Must provide a version buffer");
692 SpecialFlag flag;
693 if (lookup_special_flag(flag_name, flag)) {
694 if (!flag.deprecated_in.is_undefined()) {
695 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
696 version_less_than(JDK_Version::current(), flag.expired_in)) {
697 *version = flag.deprecated_in;
698 return 1;
699 } else {
700 return -1;
701 }
702 }
703 }
704 return 0;
705 }
706
707 #ifndef PRODUCT
708 const char* Arguments::removed_develop_logging_flag_name(const char* name){
709 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
710 const AliasedFlag& flag = removed_develop_logging_flags[i];
711 if (strcmp(flag.alias_name, name) == 0) {
712 return flag.real_name;
713 }
714 }
715 return NULL;
716 }
717 #endif // PRODUCT
718
719 const char* Arguments::real_flag_name(const char *flag_name) {
720 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
721 const AliasedFlag& flag_status = aliased_jvm_flags[i];
722 if (strcmp(flag_status.alias_name, flag_name) == 0) {
723 return flag_status.real_name;
724 }
725 }
726 return flag_name;
727 }
728
729 #ifdef ASSERT
730 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
731 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
732 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
733 return true;
734 }
735 }
736 return false;
737 }
738
739 // Verifies the correctness of the entries in the special_jvm_flags table.
740 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
741 // version being earlier than the deprecation version, then a warning is issued
742 // and verification fails - by returning false. If it is detected that the table
743 // is out of date, with respect to the current version, then ideally a warning is
744 // issued but verification does not fail. This allows the VM to operate when the
745 // version is first updated, without needing to update all the impacted flags at
746 // the same time. In practice we can't issue the warning immediately when the version
747 // is updated as it occurs for every test and some tests are not prepared to handle
748 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
749 // if the check_globals flag is true, and in addition allow a grace period and only
750 // check for stale flags when we hit build 25 (which is far enough into the 6 month
751 // release cycle that all flag updates should have been processed, whilst still
752 // leaving time to make the change before RDP2).
753 // We use a gtest to call this, passing true, so that we can detect stale flags before
754 // the end of the release cycle.
755
756 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
757
758 bool Arguments::verify_special_jvm_flags(bool check_globals) {
759 bool success = true;
760 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
761 const SpecialFlag& flag = special_jvm_flags[i];
762 if (lookup_special_flag(flag.name, i)) {
763 warning("Duplicate special flag declaration \"%s\"", flag.name);
764 success = false;
765 }
766 if (flag.deprecated_in.is_undefined() &&
767 flag.obsolete_in.is_undefined()) {
768 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
769 success = false;
770 }
771
772 if (!flag.deprecated_in.is_undefined()) {
773 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
774 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
775 success = false;
776 }
777
778 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
779 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
780 success = false;
781 }
782 }
783
784 if (!flag.obsolete_in.is_undefined()) {
785 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
786 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
787 success = false;
788 }
789
790 // if flag has become obsolete it should not have a "globals" flag defined anymore.
791 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
792 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
793 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
794 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
795 success = false;
796 }
797 }
798
799 } else if (!flag.expired_in.is_undefined()) {
800 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
801 success = false;
802 }
803
804 if (!flag.expired_in.is_undefined()) {
805 // if flag has become expired it should not have a "globals" flag defined anymore.
806 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
807 !version_less_than(JDK_Version::current(), flag.expired_in)) {
808 if (JVMFlag::find_declared_flag(flag.name) != NULL) {
809 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
810 success = false;
811 }
812 }
813 }
814 }
815 return success;
816 }
817 #endif
818
819 // Parses a size specification string.
820 bool Arguments::atojulong(const char *s, julong* result) {
821 julong n = 0;
822
823 // First char must be a digit. Don't allow negative numbers or leading spaces.
824 if (!isdigit(*s)) {
825 return false;
826 }
827
828 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
829 char* remainder;
830 errno = 0;
831 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
832 if (errno != 0) {
833 return false;
834 }
835
836 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
837 if (remainder == s || strlen(remainder) > 1) {
838 return false;
839 }
840
841 switch (*remainder) {
842 case 'T': case 't':
843 *result = n * G * K;
844 // Check for overflow.
845 if (*result/((julong)G * K) != n) return false;
846 return true;
847 case 'G': case 'g':
848 *result = n * G;
849 if (*result/G != n) return false;
850 return true;
851 case 'M': case 'm':
852 *result = n * M;
853 if (*result/M != n) return false;
854 return true;
855 case 'K': case 'k':
856 *result = n * K;
857 if (*result/K != n) return false;
858 return true;
859 case '\0':
860 *result = n;
861 return true;
862 default:
863 return false;
864 }
865 }
866
867 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
868 if (size < min_size) return arg_too_small;
869 if (size > max_size) return arg_too_big;
870 return arg_in_range;
871 }
872
873 // Describe an argument out of range error
874 void Arguments::describe_range_error(ArgsRange errcode) {
875 switch(errcode) {
876 case arg_too_big:
877 jio_fprintf(defaultStream::error_stream(),
878 "The specified size exceeds the maximum "
879 "representable size.\n");
880 break;
881 case arg_too_small:
882 case arg_unreadable:
883 case arg_in_range:
884 // do nothing for now
885 break;
886 default:
887 ShouldNotReachHere();
888 }
889 }
890
891 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
892 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
893 return true;
894 } else {
895 return false;
896 }
897 }
898
899 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
900 char* end;
901 errno = 0;
902 double v = strtod(value, &end);
903 if ((errno != 0) || (*end != 0)) {
904 return false;
905 }
906
907 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
908 return true;
909 }
910 return false;
911 }
912
913 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
914 julong v;
915 int int_v;
916 intx intx_v;
917 bool is_neg = false;
918
919 if (flag == NULL) {
920 return false;
921 }
922
923 // Check the sign first since atojulong() parses only unsigned values.
924 if (*value == '-') {
925 if (!flag->is_intx() && !flag->is_int()) {
926 return false;
927 }
928 value++;
929 is_neg = true;
930 }
931 if (!Arguments::atojulong(value, &v)) {
932 return false;
933 }
934 if (flag->is_int()) {
935 int_v = (int) v;
936 if (is_neg) {
937 int_v = -int_v;
938 }
939 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
940 } else if (flag->is_uint()) {
941 uint uint_v = (uint) v;
942 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
943 } else if (flag->is_intx()) {
944 intx_v = (intx) v;
945 if (is_neg) {
946 intx_v = -intx_v;
947 }
948 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
949 } else if (flag->is_uintx()) {
950 uintx uintx_v = (uintx) v;
951 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
952 } else if (flag->is_uint64_t()) {
953 uint64_t uint64_t_v = (uint64_t) v;
954 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
955 } else if (flag->is_size_t()) {
956 size_t size_t_v = (size_t) v;
957 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
958 } else if (flag->is_double()) {
959 double double_v = (double) v;
960 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
961 } else {
962 return false;
963 }
964 }
965
966 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
967 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
968 // Contract: JVMFlag always returns a pointer that needs freeing.
969 FREE_C_HEAP_ARRAY(char, value);
970 return true;
971 }
972
973 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
974 const char* old_value = "";
975 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
976 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
977 size_t new_len = strlen(new_value);
978 const char* value;
979 char* free_this_too = NULL;
980 if (old_len == 0) {
981 value = new_value;
982 } else if (new_len == 0) {
983 value = old_value;
984 } else {
985 size_t length = old_len + 1 + new_len + 1;
986 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
987 // each new setting adds another LINE to the switch:
988 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
989 value = buf;
990 free_this_too = buf;
991 }
992 (void) JVMFlag::ccstrAtPut(flag, &value, origin);
993 // JVMFlag always returns a pointer that needs freeing.
994 FREE_C_HEAP_ARRAY(char, value);
995 // JVMFlag made its own copy, so I must delete my own temp. buffer.
996 FREE_C_HEAP_ARRAY(char, free_this_too);
997 return true;
998 }
999
1000 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
1001 const char* real_name = real_flag_name(arg);
1002 JDK_Version since = JDK_Version();
1003 switch (is_deprecated_flag(arg, &since)) {
1004 case -1: {
1005 // Obsolete or expired, so don't process normally,
1006 // but allow for an obsolete flag we're still
1007 // temporarily allowing.
1008 if (!is_obsolete_flag(arg, &since)) {
1009 return real_name;
1010 }
1011 // Note if we're not considered obsolete then we can't be expired either
1012 // as obsoletion must come first.
1013 return NULL;
1014 }
1015 case 0:
1016 return real_name;
1017 case 1: {
1018 if (warn) {
1019 char version[256];
1020 since.to_string(version, sizeof(version));
1021 if (real_name != arg) {
1022 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
1023 arg, version, real_name);
1024 } else {
1025 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
1026 arg, version);
1027 }
1028 }
1029 return real_name;
1030 }
1031 }
1032 ShouldNotReachHere();
1033 return NULL;
1034 }
1035
1036 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1037 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1038 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1039 const int max_tagset_size = 256;
1040 int max_tagset_len = max_tagset_size - 1;
1041 char tagset_buffer[max_tagset_size];
1042 tagset_buffer[0] = '\0';
1043
1044 // Write tag-set for aliased logging option, in string list form
1045 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1046 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1047 if (i > 0) {
1048 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1049 }
1050 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1051 }
1052 if (!alf.exactMatch) {
1053 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1054 }
1055 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1056 (on) ? "+" : "-",
1057 name,
1058 tagset_buffer,
1059 (on) ? LogLevel::name(alf.level) : "off");
1060 }
1061
1062 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1063 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1064 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1065 if (strcmp(alf.alias_name, name) == 0) {
1066 log_deprecated_flag(name, on, alf);
1067 return alf;
1068 }
1069 }
1070 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1071 return a;
1072 }
1073
1074 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1075
1076 // range of acceptable characters spelled out for portability reasons
1077 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1078 #define BUFLEN 255
1079 char name[BUFLEN+1];
1080 char dummy;
1081 const char* real_name;
1082 bool warn_if_deprecated = true;
1083
1084 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1085 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1086 if (alf.alias_name != NULL){
1087 LogConfiguration::configure_stdout(LogLevel::Off, 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, false, origin);
1096 }
1097 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1098 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1099 if (alf.alias_name != NULL){
1100 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1101 return true;
1102 }
1103 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1104 if (real_name == NULL) {
1105 return false;
1106 }
1107 JVMFlag* flag = JVMFlag::find_flag(real_name);
1108 return set_bool_flag(flag, true, origin);
1109 }
1110
1111 char punct;
1112 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1113 const char* value = strchr(arg, '=') + 1;
1114
1115 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1116 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1117 if (alf.alias_name != NULL) {
1118 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1119 return true;
1120 }
1121 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1122 if (real_name == NULL) {
1123 return false;
1124 }
1125 JVMFlag* flag = JVMFlag::find_flag(real_name);
1126 if (flag != NULL && flag->is_ccstr()) {
1127 if (flag->ccstr_accumulates()) {
1128 return append_to_string_flag(flag, value, origin);
1129 } else {
1130 if (value[0] == '\0') {
1131 value = NULL;
1132 }
1133 return set_string_flag(flag, value, origin);
1134 }
1135 } else {
1136 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1137 }
1138 }
1139
1140 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1141 const char* value = strchr(arg, '=') + 1;
1142 // -XX:Foo:=xxx will reset the string flag to the given value.
1143 if (value[0] == '\0') {
1144 value = NULL;
1145 }
1146 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1147 if (real_name == NULL) {
1148 return false;
1149 }
1150 JVMFlag* flag = JVMFlag::find_flag(real_name);
1151 return set_string_flag(flag, value, origin);
1152 }
1153
1154 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1155 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1156 #define NUMBER_RANGE "[0123456789eE+-]"
1157 char value[BUFLEN + 1];
1158 char value2[BUFLEN + 1];
1159 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1160 // Looks like a floating-point number -- try again with more lenient format string
1161 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1162 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1163 if (real_name == NULL) {
1164 return false;
1165 }
1166 JVMFlag* flag = JVMFlag::find_flag(real_name);
1167 return set_fp_numeric_flag(flag, value, origin);
1168 }
1169 }
1170
1171 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1172 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1173 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1174 if (real_name == NULL) {
1175 return false;
1176 }
1177 JVMFlag* flag = JVMFlag::find_flag(real_name);
1178 return set_numeric_flag(flag, value, origin);
1179 }
1180
1181 return false;
1182 }
1183
1184 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1185 assert(bldarray != NULL, "illegal argument");
1186
1187 if (arg == NULL) {
1188 return;
1189 }
1190
1191 int new_count = *count + 1;
1192
1193 // expand the array and add arg to the last element
1194 if (*bldarray == NULL) {
1195 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1196 } else {
1197 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1198 }
1199 (*bldarray)[*count] = os::strdup_check_oom(arg);
1200 *count = new_count;
1201 }
1202
1203 void Arguments::build_jvm_args(const char* arg) {
1204 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1205 }
1206
1207 void Arguments::build_jvm_flags(const char* arg) {
1208 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1209 }
1210
1211 // utility function to return a string that concatenates all
1212 // strings in a given char** array
1213 const char* Arguments::build_resource_string(char** args, int count) {
1214 if (args == NULL || count == 0) {
1215 return NULL;
1216 }
1217 size_t length = 0;
1218 for (int i = 0; i < count; i++) {
1219 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1220 }
1221 char* s = NEW_RESOURCE_ARRAY(char, length);
1222 char* dst = s;
1223 for (int j = 0; j < count; j++) {
1224 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1225 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1226 dst += offset;
1227 length -= offset;
1228 }
1229 return (const char*) s;
1230 }
1231
1232 void Arguments::print_on(outputStream* st) {
1233 st->print_cr("VM Arguments:");
1234 if (num_jvm_flags() > 0) {
1235 st->print("jvm_flags: "); print_jvm_flags_on(st);
1236 st->cr();
1237 }
1238 if (num_jvm_args() > 0) {
1239 st->print("jvm_args: "); print_jvm_args_on(st);
1240 st->cr();
1241 }
1242 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1243 if (_java_class_path != NULL) {
1244 char* path = _java_class_path->value();
1245 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1246 }
1247 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1248 }
1249
1250 void Arguments::print_summary_on(outputStream* st) {
1251 // Print the command line. Environment variables that are helpful for
1252 // reproducing the problem are written later in the hs_err file.
1253 // flags are from setting file
1254 if (num_jvm_flags() > 0) {
1255 st->print_raw("Settings File: ");
1256 print_jvm_flags_on(st);
1257 st->cr();
1258 }
1259 // args are the command line and environment variable arguments.
1260 st->print_raw("Command Line: ");
1261 if (num_jvm_args() > 0) {
1262 print_jvm_args_on(st);
1263 }
1264 // this is the classfile and any arguments to the java program
1265 if (java_command() != NULL) {
1266 st->print("%s", java_command());
1267 }
1268 st->cr();
1269 }
1270
1271 void Arguments::print_jvm_flags_on(outputStream* st) {
1272 if (_num_jvm_flags > 0) {
1273 for (int i=0; i < _num_jvm_flags; i++) {
1274 st->print("%s ", _jvm_flags_array[i]);
1275 }
1276 }
1277 }
1278
1279 void Arguments::print_jvm_args_on(outputStream* st) {
1280 if (_num_jvm_args > 0) {
1281 for (int i=0; i < _num_jvm_args; i++) {
1282 st->print("%s ", _jvm_args_array[i]);
1283 }
1284 }
1285 }
1286
1287 bool Arguments::process_argument(const char* arg,
1288 jboolean ignore_unrecognized,
1289 JVMFlag::Flags origin) {
1290 JDK_Version since = JDK_Version();
1291
1292 if (parse_argument(arg, origin)) {
1293 return true;
1294 }
1295
1296 // Determine if the flag has '+', '-', or '=' characters.
1297 bool has_plus_minus = (*arg == '+' || *arg == '-');
1298 const char* const argname = has_plus_minus ? arg + 1 : arg;
1299
1300 size_t arg_len;
1301 const char* equal_sign = strchr(argname, '=');
1302 if (equal_sign == NULL) {
1303 arg_len = strlen(argname);
1304 } else {
1305 arg_len = equal_sign - argname;
1306 }
1307
1308 // Only make the obsolete check for valid arguments.
1309 if (arg_len <= BUFLEN) {
1310 // Construct a string which consists only of the argument name without '+', '-', or '='.
1311 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1312 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1313 if (is_obsolete_flag(stripped_argname, &since)) {
1314 char version[256];
1315 since.to_string(version, sizeof(version));
1316 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1317 return true;
1318 }
1319 #ifndef PRODUCT
1320 else {
1321 const char* replacement;
1322 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1323 log_warning(arguments)("%s has been removed. Please use %s instead.",
1324 stripped_argname,
1325 replacement);
1326 return false;
1327 }
1328 }
1329 #endif //PRODUCT
1330 }
1331
1332 // For locked flags, report a custom error message if available.
1333 // Otherwise, report the standard unrecognized VM option.
1334 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1335 if (found_flag != NULL) {
1336 char locked_message_buf[BUFLEN];
1337 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1338 if (strlen(locked_message_buf) == 0) {
1339 if (found_flag->is_bool() && !has_plus_minus) {
1340 jio_fprintf(defaultStream::error_stream(),
1341 "Missing +/- setting for VM option '%s'\n", argname);
1342 } else if (!found_flag->is_bool() && has_plus_minus) {
1343 jio_fprintf(defaultStream::error_stream(),
1344 "Unexpected +/- setting in VM option '%s'\n", argname);
1345 } else {
1346 jio_fprintf(defaultStream::error_stream(),
1347 "Improperly specified VM option '%s'\n", argname);
1348 }
1349 } else {
1350 #ifdef PRODUCT
1351 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1352 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1353 if (ignore_unrecognized && mismatched) {
1354 return true;
1355 }
1356 #endif
1357 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1358 }
1359 } else {
1360 if (ignore_unrecognized) {
1361 return true;
1362 }
1363 jio_fprintf(defaultStream::error_stream(),
1364 "Unrecognized VM option '%s'\n", argname);
1365 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1366 if (fuzzy_matched != NULL) {
1367 jio_fprintf(defaultStream::error_stream(),
1368 "Did you mean '%s%s%s'? ",
1369 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1370 fuzzy_matched->_name,
1371 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1372 }
1373 }
1374
1375 // allow for commandline "commenting out" options like -XX:#+Verbose
1376 return arg[0] == '#';
1377 }
1378
1379 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1380 FILE* stream = fopen(file_name, "rb");
1381 if (stream == NULL) {
1382 if (should_exist) {
1383 jio_fprintf(defaultStream::error_stream(),
1384 "Could not open settings file %s\n", file_name);
1385 return false;
1386 } else {
1387 return true;
1388 }
1389 }
1390
1391 char token[1024];
1392 int pos = 0;
1393
1394 bool in_white_space = true;
1395 bool in_comment = false;
1396 bool in_quote = false;
1397 char quote_c = 0;
1398 bool result = true;
1399
1400 int c = getc(stream);
1401 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1402 if (in_white_space) {
1403 if (in_comment) {
1404 if (c == '\n') in_comment = false;
1405 } else {
1406 if (c == '#') in_comment = true;
1407 else if (!isspace(c)) {
1408 in_white_space = false;
1409 token[pos++] = c;
1410 }
1411 }
1412 } else {
1413 if (c == '\n' || (!in_quote && isspace(c))) {
1414 // token ends at newline, or at unquoted whitespace
1415 // this allows a way to include spaces in string-valued options
1416 token[pos] = '\0';
1417 logOption(token);
1418 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1419 build_jvm_flags(token);
1420 pos = 0;
1421 in_white_space = true;
1422 in_quote = false;
1423 } else if (!in_quote && (c == '\'' || c == '"')) {
1424 in_quote = true;
1425 quote_c = c;
1426 } else if (in_quote && (c == quote_c)) {
1427 in_quote = false;
1428 } else {
1429 token[pos++] = c;
1430 }
1431 }
1432 c = getc(stream);
1433 }
1434 if (pos > 0) {
1435 token[pos] = '\0';
1436 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1437 build_jvm_flags(token);
1438 }
1439 fclose(stream);
1440 return result;
1441 }
1442
1443 //=============================================================================================================
1444 // Parsing of properties (-D)
1445
1446 const char* Arguments::get_property(const char* key) {
1447 return PropertyList_get_value(system_properties(), key);
1448 }
1449
1450 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1451 const char* eq = strchr(prop, '=');
1452 const char* key;
1453 const char* value = "";
1454
1455 if (eq == NULL) {
1456 // property doesn't have a value, thus use passed string
1457 key = prop;
1458 } else {
1459 // property have a value, thus extract it and save to the
1460 // allocated string
1461 size_t key_len = eq - prop;
1462 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1463
1464 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1465 key = tmp_key;
1466
1467 value = &prop[key_len + 1];
1468 }
1469
1470 if (is_internal_module_property(key) ||
1471 strcmp(key, "jdk.module.main") == 0) {
1472 MetaspaceShared::disable_optimized_module_handling();
1473 log_info(cds)("use_optimized_module_handling disabled due to incompatible property: %s=%s", key, value);
1474 }
1475
1476 if (strcmp(key, "java.compiler") == 0) {
1477 process_java_compiler_argument(value);
1478 // Record value in Arguments, but let it get passed to Java.
1479 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1480 // sun.java.launcher.is_altjvm property is
1481 // private and is processed in process_sun_java_launcher_properties();
1482 // the sun.java.launcher property is passed on to the java application
1483 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1484 // append is true, writable is true, internal is false
1485 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1486 WriteableProperty, ExternalProperty);
1487 } else {
1488 if (strcmp(key, "sun.java.command") == 0) {
1489 char *old_java_command = _java_command;
1490 _java_command = os::strdup_check_oom(value, mtArguments);
1491 if (old_java_command != NULL) {
1492 os::free(old_java_command);
1493 }
1494 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1495 // If this property is set on the command line then its value will be
1496 // displayed in VM error logs as the URL at which to submit such logs.
1497 // Normally the URL displayed in error logs is different from the value
1498 // of this system property, so a different property should have been
1499 // used here, but we leave this as-is in case someone depends upon it.
1500 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1501 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1502 // its value without going through the property list or making a Java call.
1503 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1504 if (old_java_vendor_url_bug != NULL) {
1505 os::free((void *)old_java_vendor_url_bug);
1506 }
1507 }
1508
1509 // Create new property and add at the end of the list
1510 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1511 }
1512
1513 if (key != prop) {
1514 // SystemProperty copy passed value, thus free previously allocated
1515 // memory
1516 FreeHeap((void *)key);
1517 }
1518
1519 return true;
1520 }
1521
1522 #if INCLUDE_CDS
1523 const char* unsupported_properties[] = { "jdk.module.limitmods",
1524 "jdk.module.upgrade.path",
1525 "jdk.module.patch.0" };
1526 const char* unsupported_options[] = { "--limit-modules",
1527 "--upgrade-module-path",
1528 "--patch-module"
1529 };
1530 void Arguments::check_unsupported_dumping_properties() {
1531 assert(is_dumping_archive(),
1532 "this function is only used with CDS dump time");
1533 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1534 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1535 SystemProperty* sp = system_properties();
1536 while (sp != NULL) {
1537 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1538 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1539 vm_exit_during_initialization(
1540 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1541 }
1542 }
1543 sp = sp->next();
1544 }
1545
1546 // Check for an exploded module build in use with -Xshare:dump.
1547 if (!has_jimage()) {
1548 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1549 }
1550 }
1551
1552 bool Arguments::check_unsupported_cds_runtime_properties() {
1553 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1554 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1555 if (ArchiveClassesAtExit != NULL) {
1556 // dynamic dumping, just return false for now.
1557 // check_unsupported_dumping_properties() will be called later to check the same set of
1558 // properties, and will exit the VM with the correct error message if the unsupported properties
1559 // are used.
1560 return false;
1561 }
1562 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1563 if (get_property(unsupported_properties[i]) != NULL) {
1564 if (RequireSharedSpaces) {
1565 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1566 }
1567 return true;
1568 }
1569 }
1570 return false;
1571 }
1572 #endif
1573
1574 //===========================================================================================================
1575 // Setting int/mixed/comp mode flags
1576
1577 void Arguments::set_mode_flags(Mode mode) {
1578 // Set up default values for all flags.
1579 // If you add a flag to any of the branches below,
1580 // add a default value for it here.
1581 set_java_compiler(false);
1582 _mode = mode;
1583
1584 // Ensure Agent_OnLoad has the correct initial values.
1585 // This may not be the final mode; mode may change later in onload phase.
1586 PropertyList_unique_add(&_system_properties, "java.vm.info",
1587 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1588
1589 UseInterpreter = true;
1590 UseCompiler = true;
1591 UseLoopCounter = true;
1592
1593 // Default values may be platform/compiler dependent -
1594 // use the saved values
1595 ClipInlining = Arguments::_ClipInlining;
1596 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1597 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1598 BackgroundCompilation = Arguments::_BackgroundCompilation;
1599 if (TieredCompilation) {
1600 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1601 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1602 }
1603 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1604 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1605 }
1606 }
1607
1608 // Change from defaults based on mode
1609 switch (mode) {
1610 default:
1611 ShouldNotReachHere();
1612 break;
1613 case _int:
1614 UseCompiler = false;
1615 UseLoopCounter = false;
1616 AlwaysCompileLoopMethods = false;
1617 UseOnStackReplacement = false;
1618 break;
1619 case _mixed:
1620 // same as default
1621 break;
1622 case _comp:
1623 UseInterpreter = false;
1624 BackgroundCompilation = false;
1625 ClipInlining = false;
1626 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1627 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1628 // compile a level 4 (C2) and then continue executing it.
1629 if (TieredCompilation) {
1630 Tier3InvokeNotifyFreqLog = 0;
1631 Tier4InvocationThreshold = 0;
1632 }
1633 break;
1634 }
1635 }
1636
1637 // Conflict: required to use shared spaces (-Xshare:on), but
1638 // incompatible command line options were chosen.
1639 static void no_shared_spaces(const char* message) {
1640 if (RequireSharedSpaces) {
1641 jio_fprintf(defaultStream::error_stream(),
1642 "Class data sharing is inconsistent with other specified options.\n");
1643 vm_exit_during_initialization("Unable to use shared archive", message);
1644 } else {
1645 log_info(cds)("Unable to use shared archive: %s", message);
1646 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1647 }
1648 }
1649
1650 void set_object_alignment() {
1651 // Object alignment.
1652 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1653 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1654 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1655 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1656 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1657 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1658
1659 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1660 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1661
1662 // Oop encoding heap max
1663 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1664
1665 if (SurvivorAlignmentInBytes == 0) {
1666 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1667 }
1668 }
1669
1670 size_t Arguments::max_heap_for_compressed_oops() {
1671 // Avoid sign flip.
1672 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1673 // We need to fit both the NULL page and the heap into the memory budget, while
1674 // keeping alignment constraints of the heap. To guarantee the latter, as the
1675 // NULL page is located before the heap, we pad the NULL page to the conservative
1676 // maximum alignment that the GC may ever impose upon the heap.
1677 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1678 _conservative_max_heap_alignment);
1679
1680 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1681 NOT_LP64(ShouldNotReachHere(); return 0);
1682 }
1683
1684 void Arguments::set_use_compressed_oops() {
1685 #ifndef ZERO
1686 #ifdef _LP64
1687 // MaxHeapSize is not set up properly at this point, but
1688 // the only value that can override MaxHeapSize if we are
1689 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1690 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1691
1692 if (max_heap_size <= max_heap_for_compressed_oops()) {
1693 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1694 FLAG_SET_ERGO(UseCompressedOops, true);
1695 }
1696 } else {
1697 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1698 warning("Max heap size too large for Compressed Oops");
1699 FLAG_SET_DEFAULT(UseCompressedOops, false);
1700 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1701 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1702 }
1703 }
1704 }
1705 #endif // _LP64
1706 #endif // ZERO
1707 }
1708
1709
1710 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1711 // set_use_compressed_oops().
1712 void Arguments::set_use_compressed_klass_ptrs() {
1713 #ifndef ZERO
1714 #ifdef _LP64
1715 // On some architectures, the use of UseCompressedClassPointers implies the use of
1716 // UseCompressedOops. The reason is that the rheap_base register of said platforms
1717 // is reused to perform some optimized spilling, in order to use rheap_base as a
1718 // temp register. But by treating it as any other temp register, spilling can typically
1719 // be completely avoided instead. So it is better not to perform this trick. And by
1720 // not having that reliance, large heaps, or heaps not supporting compressed oops,
1721 // can still use compressed class pointers.
1722 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) {
1723 if (UseCompressedClassPointers) {
1724 warning("UseCompressedClassPointers requires UseCompressedOops");
1725 }
1726 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1727 } else {
1728 // Turn on UseCompressedClassPointers too
1729 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1730 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1731 }
1732 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1733 if (UseCompressedClassPointers) {
1734 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1735 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1736 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1737 }
1738 }
1739 }
1740 #endif // _LP64
1741 #endif // !ZERO
1742 }
1743
1744 void Arguments::set_conservative_max_heap_alignment() {
1745 // The conservative maximum required alignment for the heap is the maximum of
1746 // the alignments imposed by several sources: any requirements from the heap
1747 // itself and the maximum page size we may run the VM with.
1748 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1749 _conservative_max_heap_alignment = MAX4(heap_alignment,
1750 (size_t)os::vm_allocation_granularity(),
1751 os::max_page_size(),
1752 GCArguments::compute_heap_alignment());
1753 }
1754
1755 jint Arguments::set_ergonomics_flags() {
1756 GCConfig::initialize();
1757
1758 set_conservative_max_heap_alignment();
1759
1760 #ifndef ZERO
1761 #ifdef _LP64
1762 set_use_compressed_oops();
1763
1764 // set_use_compressed_klass_ptrs() must be called after calling
1765 // set_use_compressed_oops().
1766 set_use_compressed_klass_ptrs();
1767
1768 // Also checks that certain machines are slower with compressed oops
1769 // in vm_version initialization code.
1770 #endif // _LP64
1771 #endif // !ZERO
1772
1773 return JNI_OK;
1774 }
1775
1776 julong Arguments::limit_by_allocatable_memory(julong limit) {
1777 julong max_allocatable;
1778 julong result = limit;
1779 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1780 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1781 }
1782 return result;
1783 }
1784
1785 // Use static initialization to get the default before parsing
1786 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1787
1788 void Arguments::set_heap_size() {
1789 julong phys_mem;
1790
1791 // If the user specified one of these options, they
1792 // want specific memory sizing so do not limit memory
1793 // based on compressed oops addressability.
1794 // Also, memory limits will be calculated based on
1795 // available os physical memory, not our MaxRAM limit,
1796 // unless MaxRAM is also specified.
1797 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1798 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1799 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1800 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1801 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1802 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1803 !FLAG_IS_DEFAULT(MaxRAM));
1804 if (override_coop_limit) {
1805 if (FLAG_IS_DEFAULT(MaxRAM)) {
1806 phys_mem = os::physical_memory();
1807 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1808 } else {
1809 phys_mem = (julong)MaxRAM;
1810 }
1811 } else {
1812 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1813 : (julong)MaxRAM;
1814 }
1815
1816
1817 // Convert deprecated flags
1818 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1819 !FLAG_IS_DEFAULT(MaxRAMFraction))
1820 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1821
1822 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1823 !FLAG_IS_DEFAULT(MinRAMFraction))
1824 MinRAMPercentage = 100.0 / MinRAMFraction;
1825
1826 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1827 !FLAG_IS_DEFAULT(InitialRAMFraction))
1828 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1829
1830 // If the maximum heap size has not been set with -Xmx,
1831 // then set it as fraction of the size of physical memory,
1832 // respecting the maximum and minimum sizes of the heap.
1833 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1834 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1835 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1836 if (reasonable_min < MaxHeapSize) {
1837 // Small physical memory, so use a minimum fraction of it for the heap
1838 reasonable_max = reasonable_min;
1839 } else {
1840 // Not-small physical memory, so require a heap at least
1841 // as large as MaxHeapSize
1842 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1843 }
1844
1845 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1846 // Limit the heap size to ErgoHeapSizeLimit
1847 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1848 }
1849
1850 #ifdef _LP64
1851 if (UseCompressedOops || UseCompressedClassPointers) {
1852 // HeapBaseMinAddress can be greater than default but not less than.
1853 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1854 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1855 // matches compressed oops printing flags
1856 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1857 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1858 DefaultHeapBaseMinAddress,
1859 DefaultHeapBaseMinAddress/G,
1860 HeapBaseMinAddress);
1861 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1862 }
1863 }
1864 }
1865 if (UseCompressedOops) {
1866 // Limit the heap size to the maximum possible when using compressed oops
1867 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1868
1869 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1870 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1871 // but it should be not less than default MaxHeapSize.
1872 max_coop_heap -= HeapBaseMinAddress;
1873 }
1874
1875 // If user specified flags prioritizing os physical
1876 // memory limits, then disable compressed oops if
1877 // limits exceed max_coop_heap and UseCompressedOops
1878 // was not specified.
1879 if (reasonable_max > max_coop_heap) {
1880 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1881 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1882 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1883 "Please check the setting of MaxRAMPercentage %5.2f."
1884 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1885 FLAG_SET_ERGO(UseCompressedOops, false);
1886 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
1887 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1888 }
1889 } else {
1890 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1891 }
1892 }
1893 }
1894 #endif // _LP64
1895
1896 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1897
1898 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1899 // An initial heap size was specified on the command line,
1900 // so be sure that the maximum size is consistent. Done
1901 // after call to limit_by_allocatable_memory because that
1902 // method might reduce the allocation size.
1903 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1904 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1905 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1906 }
1907
1908 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1909 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1910 }
1911
1912 // If the minimum or initial heap_size have not been set or requested to be set
1913 // ergonomically, set them accordingly.
1914 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1915 julong reasonable_minimum = (julong)(OldSize + NewSize);
1916
1917 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1918
1919 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1920
1921 if (InitialHeapSize == 0) {
1922 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1923
1924 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1925 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1926
1927 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1928
1929 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1930 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1931 }
1932 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1933 // synchronize with InitialHeapSize to avoid errors with the default value.
1934 if (MinHeapSize == 0) {
1935 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1936 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1937 }
1938 }
1939 }
1940
1941 // This option inspects the machine and attempts to set various
1942 // parameters to be optimal for long-running, memory allocation
1943 // intensive jobs. It is intended for machines with large
1944 // amounts of cpu and memory.
1945 jint Arguments::set_aggressive_heap_flags() {
1946 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1947 // VM, but we may not be able to represent the total physical memory
1948 // available (like having 8gb of memory on a box but using a 32bit VM).
1949 // Thus, we need to make sure we're using a julong for intermediate
1950 // calculations.
1951 julong initHeapSize;
1952 julong total_memory = os::physical_memory();
1953
1954 if (total_memory < (julong) 256 * M) {
1955 jio_fprintf(defaultStream::error_stream(),
1956 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1957 vm_exit(1);
1958 }
1959
1960 // The heap size is half of available memory, or (at most)
1961 // all of possible memory less 160mb (leaving room for the OS
1962 // when using ISM). This is the maximum; because adaptive sizing
1963 // is turned on below, the actual space used may be smaller.
1964
1965 initHeapSize = MIN2(total_memory / (julong) 2,
1966 total_memory - (julong) 160 * M);
1967
1968 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1969
1970 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1971 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1972 return JNI_EINVAL;
1973 }
1974 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1975 return JNI_EINVAL;
1976 }
1977 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1978 return JNI_EINVAL;
1979 }
1980 }
1981 if (FLAG_IS_DEFAULT(NewSize)) {
1982 // Make the young generation 3/8ths of the total heap.
1983 if (FLAG_SET_CMDLINE(NewSize,
1984 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1985 return JNI_EINVAL;
1986 }
1987 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1988 return JNI_EINVAL;
1989 }
1990 }
1991
1992 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1993 FLAG_SET_DEFAULT(UseLargePages, true);
1994 #endif
1995
1996 // Increase some data structure sizes for efficiency
1997 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1998 return JNI_EINVAL;
1999 }
2000 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
2001 return JNI_EINVAL;
2002 }
2003 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
2004 return JNI_EINVAL;
2005 }
2006
2007 // See the OldPLABSize comment below, but replace 'after promotion'
2008 // with 'after copying'. YoungPLABSize is the size of the survivor
2009 // space per-gc-thread buffers. The default is 4kw.
2010 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2011 return JNI_EINVAL;
2012 }
2013
2014 // OldPLABSize is the size of the buffers in the old gen that
2015 // UseParallelGC uses to promote live data that doesn't fit in the
2016 // survivor spaces. At any given time, there's one for each gc thread.
2017 // The default size is 1kw. These buffers are rarely used, since the
2018 // survivor spaces are usually big enough. For specjbb, however, there
2019 // are occasions when there's lots of live data in the young gen
2020 // and we end up promoting some of it. We don't have a definite
2021 // explanation for why bumping OldPLABSize helps, but the theory
2022 // is that a bigger PLAB results in retaining something like the
2023 // original allocation order after promotion, which improves mutator
2024 // locality. A minor effect may be that larger PLABs reduce the
2025 // number of PLAB allocation events during gc. The value of 8kw
2026 // was arrived at by experimenting with specjbb.
2027 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2028 return JNI_EINVAL;
2029 }
2030
2031 // Enable parallel GC and adaptive generation sizing
2032 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
2033 return JNI_EINVAL;
2034 }
2035
2036 // Encourage steady state memory management
2037 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
2038 return JNI_EINVAL;
2039 }
2040
2041 // This appears to improve mutator locality
2042 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2043 return JNI_EINVAL;
2044 }
2045
2046 return JNI_OK;
2047 }
2048
2049 // This must be called after ergonomics.
2050 void Arguments::set_bytecode_flags() {
2051 if (!RewriteBytecodes) {
2052 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2053 }
2054 }
2055
2056 // Aggressive optimization flags
2057 jint Arguments::set_aggressive_opts_flags() {
2058 #ifdef COMPILER2
2059 if (AggressiveUnboxing) {
2060 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2061 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2062 } else if (!EliminateAutoBox) {
2063 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2064 AggressiveUnboxing = false;
2065 }
2066 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2067 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2068 } else if (!DoEscapeAnalysis) {
2069 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2070 AggressiveUnboxing = false;
2071 }
2072 }
2073 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2074 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2075 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2076 }
2077 // Feed the cache size setting into the JDK
2078 char buffer[1024];
2079 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2080 if (!add_property(buffer)) {
2081 return JNI_ENOMEM;
2082 }
2083 }
2084 #endif
2085
2086 return JNI_OK;
2087 }
2088
2089 //===========================================================================================================
2090 // Parsing of java.compiler property
2091
2092 void Arguments::process_java_compiler_argument(const char* arg) {
2093 // For backwards compatibility, Djava.compiler=NONE or ""
2094 // causes us to switch to -Xint mode UNLESS -Xdebug
2095 // is also specified.
2096 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2097 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2098 }
2099 }
2100
2101 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2102 _sun_java_launcher = os::strdup_check_oom(launcher);
2103 }
2104
2105 bool Arguments::created_by_java_launcher() {
2106 assert(_sun_java_launcher != NULL, "property must have value");
2107 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2108 }
2109
2110 bool Arguments::sun_java_launcher_is_altjvm() {
2111 return _sun_java_launcher_is_altjvm;
2112 }
2113
2114 //===========================================================================================================
2115 // Parsing of main arguments
2116
2117 unsigned int addreads_count = 0;
2118 unsigned int addexports_count = 0;
2119 unsigned int addopens_count = 0;
2120 unsigned int addmods_count = 0;
2121 unsigned int patch_mod_count = 0;
2122
2123 // Check the consistency of vm_init_args
2124 bool Arguments::check_vm_args_consistency() {
2125 // Method for adding checks for flag consistency.
2126 // The intent is to warn the user of all possible conflicts,
2127 // before returning an error.
2128 // Note: Needs platform-dependent factoring.
2129 bool status = true;
2130
2131 if (TLABRefillWasteFraction == 0) {
2132 jio_fprintf(defaultStream::error_stream(),
2133 "TLABRefillWasteFraction should be a denominator, "
2134 "not " SIZE_FORMAT "\n",
2135 TLABRefillWasteFraction);
2136 status = false;
2137 }
2138
2139 if (PrintNMTStatistics) {
2140 #if INCLUDE_NMT
2141 if (MemTracker::tracking_level() == NMT_off) {
2142 #endif // INCLUDE_NMT
2143 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2144 PrintNMTStatistics = false;
2145 #if INCLUDE_NMT
2146 }
2147 #endif
2148 }
2149
2150 status = CompilerConfig::check_args_consistency(status);
2151 #if INCLUDE_JVMCI
2152 if (status && EnableJVMCI) {
2153 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2154 AddProperty, UnwriteableProperty, InternalProperty);
2155 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2156 return false;
2157 }
2158 }
2159 #endif
2160
2161 #ifndef SUPPORT_RESERVED_STACK_AREA
2162 if (StackReservedPages != 0) {
2163 FLAG_SET_CMDLINE(StackReservedPages, 0);
2164 warning("Reserved Stack Area not supported on this platform");
2165 }
2166 #endif
2167
2168 status = status && GCArguments::check_args_consistency();
2169
2170 return status;
2171 }
2172
2173 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2174 const char* option_type) {
2175 if (ignore) return false;
2176
2177 const char* spacer = " ";
2178 if (option_type == NULL) {
2179 option_type = ++spacer; // Set both to the empty string.
2180 }
2181
2182 jio_fprintf(defaultStream::error_stream(),
2183 "Unrecognized %s%soption: %s\n", option_type, spacer,
2184 option->optionString);
2185 return true;
2186 }
2187
2188 static const char* user_assertion_options[] = {
2189 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2190 };
2191
2192 static const char* system_assertion_options[] = {
2193 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2194 };
2195
2196 bool Arguments::parse_uintx(const char* value,
2197 uintx* uintx_arg,
2198 uintx min_size) {
2199
2200 // Check the sign first since atojulong() parses only unsigned values.
2201 bool value_is_positive = !(*value == '-');
2202
2203 if (value_is_positive) {
2204 julong n;
2205 bool good_return = atojulong(value, &n);
2206 if (good_return) {
2207 bool above_minimum = n >= min_size;
2208 bool value_is_too_large = n > max_uintx;
2209
2210 if (above_minimum && !value_is_too_large) {
2211 *uintx_arg = n;
2212 return true;
2213 }
2214 }
2215 }
2216 return false;
2217 }
2218
2219 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2220 assert(is_internal_module_property(prop_name) ||
2221 strcmp(prop_name, "jdk.module.illegalAccess") == 0, "unknown module property: '%s'", prop_name);
2222 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2223 char* property = AllocateHeap(prop_len, mtArguments);
2224 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2225 if (ret < 0 || ret >= (int)prop_len) {
2226 FreeHeap(property);
2227 return false;
2228 }
2229 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
2230 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
2231 // that multiple occurrences of the associated flag just causes the existing property value to be
2232 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
2233 // to a property after we have finished flag processing.
2234 bool added = add_property(property, WriteableProperty, internal);
2235 FreeHeap(property);
2236 return added;
2237 }
2238
2239 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2240 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2241 const unsigned int props_count_limit = 1000;
2242 const int max_digits = 3;
2243 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2244
2245 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2246 if (count < props_count_limit) {
2247 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2248 char* property = AllocateHeap(prop_len, mtArguments);
2249 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2250 if (ret < 0 || ret >= (int)prop_len) {
2251 FreeHeap(property);
2252 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2253 return false;
2254 }
2255 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2256 FreeHeap(property);
2257 return added;
2258 }
2259
2260 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2261 return false;
2262 }
2263
2264 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2265 julong* long_arg,
2266 julong min_size,
2267 julong max_size) {
2268 if (!atojulong(s, long_arg)) return arg_unreadable;
2269 return check_memory_size(*long_arg, min_size, max_size);
2270 }
2271
2272 // Parse JavaVMInitArgs structure
2273
2274 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2275 const JavaVMInitArgs *java_tool_options_args,
2276 const JavaVMInitArgs *java_options_args,
2277 const JavaVMInitArgs *cmd_line_args) {
2278 bool patch_mod_javabase = false;
2279
2280 // Save default settings for some mode flags
2281 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2282 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2283 Arguments::_ClipInlining = ClipInlining;
2284 Arguments::_BackgroundCompilation = BackgroundCompilation;
2285 if (TieredCompilation) {
2286 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2287 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2288 }
2289
2290 // Remember the default value of SharedBaseAddress.
2291 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2292
2293 // Setup flags for mixed which is the default
2294 set_mode_flags(_mixed);
2295
2296 // Parse args structure generated from java.base vm options resource
2297 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2298 if (result != JNI_OK) {
2299 return result;
2300 }
2301
2302 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2303 // variable (if present).
2304 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2305 if (result != JNI_OK) {
2306 return result;
2307 }
2308
2309 // Parse args structure generated from the command line flags.
2310 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2311 if (result != JNI_OK) {
2312 return result;
2313 }
2314
2315 // Parse args structure generated from the _JAVA_OPTIONS environment
2316 // variable (if present) (mimics classic VM)
2317 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2318 if (result != JNI_OK) {
2319 return result;
2320 }
2321
2322 // We need to ensure processor and memory resources have been properly
2323 // configured - which may rely on arguments we just processed - before
2324 // doing the final argument processing. Any argument processing that
2325 // needs to know about processor and memory resources must occur after
2326 // this point.
2327
2328 os::init_container_support();
2329
2330 // Do final processing now that all arguments have been parsed
2331 result = finalize_vm_init_args(patch_mod_javabase);
2332 if (result != JNI_OK) {
2333 return result;
2334 }
2335
2336 return JNI_OK;
2337 }
2338
2339 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2340 // represents a valid JDWP agent. is_path==true denotes that we
2341 // are dealing with -agentpath (case where name is a path), otherwise with
2342 // -agentlib
2343 bool valid_jdwp_agent(char *name, bool is_path) {
2344 char *_name;
2345 const char *_jdwp = "jdwp";
2346 size_t _len_jdwp, _len_prefix;
2347
2348 if (is_path) {
2349 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2350 return false;
2351 }
2352
2353 _name++; // skip past last path separator
2354 _len_prefix = strlen(JNI_LIB_PREFIX);
2355
2356 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2357 return false;
2358 }
2359
2360 _name += _len_prefix;
2361 _len_jdwp = strlen(_jdwp);
2362
2363 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2364 _name += _len_jdwp;
2365 }
2366 else {
2367 return false;
2368 }
2369
2370 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2371 return false;
2372 }
2373
2374 return true;
2375 }
2376
2377 if (strcmp(name, _jdwp) == 0) {
2378 return true;
2379 }
2380
2381 return false;
2382 }
2383
2384 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2385 // --patch-module=<module>=<file>(<pathsep><file>)*
2386 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2387 // Find the equal sign between the module name and the path specification
2388 const char* module_equal = strchr(patch_mod_tail, '=');
2389 if (module_equal == NULL) {
2390 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2391 return JNI_ERR;
2392 } else {
2393 // Pick out the module name
2394 size_t module_len = module_equal - patch_mod_tail;
2395 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2396 if (module_name != NULL) {
2397 memcpy(module_name, patch_mod_tail, module_len);
2398 *(module_name + module_len) = '\0';
2399 // The path piece begins one past the module_equal sign
2400 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2401 FREE_C_HEAP_ARRAY(char, module_name);
2402 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2403 return JNI_ENOMEM;
2404 }
2405 } else {
2406 return JNI_ENOMEM;
2407 }
2408 }
2409 return JNI_OK;
2410 }
2411
2412 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2413 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2414 // The min and max sizes match the values in globals.hpp, but scaled
2415 // with K. The values have been chosen so that alignment with page
2416 // size doesn't change the max value, which makes the conversions
2417 // back and forth between Xss value and ThreadStackSize value easier.
2418 // The values have also been chosen to fit inside a 32-bit signed type.
2419 const julong min_ThreadStackSize = 0;
2420 const julong max_ThreadStackSize = 1 * M;
2421
2422 const julong min_size = min_ThreadStackSize * K;
2423 const julong max_size = max_ThreadStackSize * K;
2424
2425 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2426
2427 julong size = 0;
2428 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2429 if (errcode != arg_in_range) {
2430 bool silent = (option == NULL); // Allow testing to silence error messages
2431 if (!silent) {
2432 jio_fprintf(defaultStream::error_stream(),
2433 "Invalid thread stack size: %s\n", option->optionString);
2434 describe_range_error(errcode);
2435 }
2436 return JNI_EINVAL;
2437 }
2438
2439 // Internally track ThreadStackSize in units of 1024 bytes.
2440 const julong size_aligned = align_up(size, K);
2441 assert(size <= size_aligned,
2442 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2443 size, size_aligned);
2444
2445 const julong size_in_K = size_aligned / K;
2446 assert(size_in_K < (julong)max_intx,
2447 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2448 size_in_K);
2449
2450 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2451 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2452 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2453 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2454 max_expanded, size_in_K);
2455
2456 *out_ThreadStackSize = (intx)size_in_K;
2457
2458 return JNI_OK;
2459 }
2460
2461 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2462 // For match_option to return remaining or value part of option string
2463 const char* tail;
2464
2465 // iterate over arguments
2466 for (int index = 0; index < args->nOptions; index++) {
2467 bool is_absolute_path = false; // for -agentpath vs -agentlib
2468
2469 const JavaVMOption* option = args->options + index;
2470
2471 if (!match_option(option, "-Djava.class.path", &tail) &&
2472 !match_option(option, "-Dsun.java.command", &tail) &&
2473 !match_option(option, "-Dsun.java.launcher", &tail)) {
2474
2475 // add all jvm options to the jvm_args string. This string
2476 // is used later to set the java.vm.args PerfData string constant.
2477 // the -Djava.class.path and the -Dsun.java.command options are
2478 // omitted from jvm_args string as each have their own PerfData
2479 // string constant object.
2480 build_jvm_args(option->optionString);
2481 }
2482
2483 // -verbose:[class/module/gc/jni]
2484 if (match_option(option, "-verbose", &tail)) {
2485 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2486 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2487 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2488 } else if (!strcmp(tail, ":module")) {
2489 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2490 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2491 } else if (!strcmp(tail, ":gc")) {
2492 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2493 } else if (!strcmp(tail, ":jni")) {
2494 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2495 }
2496 // -da / -ea / -disableassertions / -enableassertions
2497 // These accept an optional class/package name separated by a colon, e.g.,
2498 // -da:java.lang.Thread.
2499 } else if (match_option(option, user_assertion_options, &tail, true)) {
2500 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2501 if (*tail == '\0') {
2502 JavaAssertions::setUserClassDefault(enable);
2503 } else {
2504 assert(*tail == ':', "bogus match by match_option()");
2505 JavaAssertions::addOption(tail + 1, enable);
2506 }
2507 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2508 } else if (match_option(option, system_assertion_options, &tail, false)) {
2509 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2510 JavaAssertions::setSystemClassDefault(enable);
2511 // -bootclasspath:
2512 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2513 jio_fprintf(defaultStream::output_stream(),
2514 "-Xbootclasspath is no longer a supported option.\n");
2515 return JNI_EINVAL;
2516 // -bootclasspath/a:
2517 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2518 Arguments::append_sysclasspath(tail);
2519 MetaspaceShared::disable_optimized_module_handling();
2520 log_info(cds)("use_optimized_module_handling disabled: bootclasspath was appended");
2521 // -bootclasspath/p:
2522 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2523 jio_fprintf(defaultStream::output_stream(),
2524 "-Xbootclasspath/p is no longer a supported option.\n");
2525 return JNI_EINVAL;
2526 // -Xrun
2527 } else if (match_option(option, "-Xrun", &tail)) {
2528 if (tail != NULL) {
2529 const char* pos = strchr(tail, ':');
2530 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2531 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2532 jio_snprintf(name, len + 1, "%s", tail);
2533
2534 char *options = NULL;
2535 if(pos != NULL) {
2536 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2537 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2538 }
2539 #if !INCLUDE_JVMTI
2540 if (strcmp(name, "jdwp") == 0) {
2541 jio_fprintf(defaultStream::error_stream(),
2542 "Debugging agents are not supported in this VM\n");
2543 return JNI_ERR;
2544 }
2545 #endif // !INCLUDE_JVMTI
2546 add_init_library(name, options);
2547 }
2548 } else if (match_option(option, "--add-reads=", &tail)) {
2549 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2550 return JNI_ENOMEM;
2551 }
2552 } else if (match_option(option, "--add-exports=", &tail)) {
2553 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2554 return JNI_ENOMEM;
2555 }
2556 } else if (match_option(option, "--add-opens=", &tail)) {
2557 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2558 return JNI_ENOMEM;
2559 }
2560 } else if (match_option(option, "--add-modules=", &tail)) {
2561 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2562 return JNI_ENOMEM;
2563 }
2564 } else if (match_option(option, "--limit-modules=", &tail)) {
2565 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2566 return JNI_ENOMEM;
2567 }
2568 } else if (match_option(option, "--module-path=", &tail)) {
2569 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2570 return JNI_ENOMEM;
2571 }
2572 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2573 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2574 return JNI_ENOMEM;
2575 }
2576 } else if (match_option(option, "--patch-module=", &tail)) {
2577 // --patch-module=<module>=<file>(<pathsep><file>)*
2578 int res = process_patch_mod_option(tail, patch_mod_javabase);
2579 if (res != JNI_OK) {
2580 return res;
2581 }
2582 } else if (match_option(option, "--illegal-access=", &tail)) {
2583 if (!create_module_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2584 return JNI_ENOMEM;
2585 }
2586 // -agentlib and -agentpath
2587 } else if (match_option(option, "-agentlib:", &tail) ||
2588 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2589 if(tail != NULL) {
2590 const char* pos = strchr(tail, '=');
2591 char* name;
2592 if (pos == NULL) {
2593 name = os::strdup_check_oom(tail, mtArguments);
2594 } else {
2595 size_t len = pos - tail;
2596 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2597 memcpy(name, tail, len);
2598 name[len] = '\0';
2599 }
2600
2601 char *options = NULL;
2602 if(pos != NULL) {
2603 options = os::strdup_check_oom(pos + 1, mtArguments);
2604 }
2605 #if !INCLUDE_JVMTI
2606 if (valid_jdwp_agent(name, is_absolute_path)) {
2607 jio_fprintf(defaultStream::error_stream(),
2608 "Debugging agents are not supported in this VM\n");
2609 return JNI_ERR;
2610 }
2611 #endif // !INCLUDE_JVMTI
2612 add_init_agent(name, options, is_absolute_path);
2613 }
2614 // -javaagent
2615 } else if (match_option(option, "-javaagent:", &tail)) {
2616 #if !INCLUDE_JVMTI
2617 jio_fprintf(defaultStream::error_stream(),
2618 "Instrumentation agents are not supported in this VM\n");
2619 return JNI_ERR;
2620 #else
2621 if (tail != NULL) {
2622 size_t length = strlen(tail) + 1;
2623 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2624 jio_snprintf(options, length, "%s", tail);
2625 add_instrument_agent("instrument", options, false);
2626 // java agents need module java.instrument
2627 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2628 return JNI_ENOMEM;
2629 }
2630 }
2631 #endif // !INCLUDE_JVMTI
2632 // --enable_preview
2633 } else if (match_option(option, "--enable-preview")) {
2634 set_enable_preview();
2635 // -Xnoclassgc
2636 } else if (match_option(option, "-Xnoclassgc")) {
2637 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2638 return JNI_EINVAL;
2639 }
2640 // -Xbatch
2641 } else if (match_option(option, "-Xbatch")) {
2642 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2643 return JNI_EINVAL;
2644 }
2645 // -Xmn for compatibility with other JVM vendors
2646 } else if (match_option(option, "-Xmn", &tail)) {
2647 julong long_initial_young_size = 0;
2648 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2649 if (errcode != arg_in_range) {
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Invalid initial young generation size: %s\n", option->optionString);
2652 describe_range_error(errcode);
2653 return JNI_EINVAL;
2654 }
2655 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2656 return JNI_EINVAL;
2657 }
2658 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2659 return JNI_EINVAL;
2660 }
2661 // -Xms
2662 } else if (match_option(option, "-Xms", &tail)) {
2663 julong size = 0;
2664 // an initial heap size of 0 means automatically determine
2665 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2666 if (errcode != arg_in_range) {
2667 jio_fprintf(defaultStream::error_stream(),
2668 "Invalid initial heap size: %s\n", option->optionString);
2669 describe_range_error(errcode);
2670 return JNI_EINVAL;
2671 }
2672 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2673 return JNI_EINVAL;
2674 }
2675 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 // -Xmx
2679 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2680 julong long_max_heap_size = 0;
2681 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2682 if (errcode != arg_in_range) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid maximum heap size: %s\n", option->optionString);
2685 describe_range_error(errcode);
2686 return JNI_EINVAL;
2687 }
2688 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2689 return JNI_EINVAL;
2690 }
2691 // Xmaxf
2692 } else if (match_option(option, "-Xmaxf", &tail)) {
2693 char* err;
2694 int maxf = (int)(strtod(tail, &err) * 100);
2695 if (*err != '\0' || *tail == '\0') {
2696 jio_fprintf(defaultStream::error_stream(),
2697 "Bad max heap free percentage size: %s\n",
2698 option->optionString);
2699 return JNI_EINVAL;
2700 } else {
2701 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 }
2705 // Xminf
2706 } else if (match_option(option, "-Xminf", &tail)) {
2707 char* err;
2708 int minf = (int)(strtod(tail, &err) * 100);
2709 if (*err != '\0' || *tail == '\0') {
2710 jio_fprintf(defaultStream::error_stream(),
2711 "Bad min heap free percentage size: %s\n",
2712 option->optionString);
2713 return JNI_EINVAL;
2714 } else {
2715 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 }
2719 // -Xss
2720 } else if (match_option(option, "-Xss", &tail)) {
2721 intx value = 0;
2722 jint err = parse_xss(option, tail, &value);
2723 if (err != JNI_OK) {
2724 return err;
2725 }
2726 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2730 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2731 julong long_ReservedCodeCacheSize = 0;
2732
2733 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2734 if (errcode != arg_in_range) {
2735 jio_fprintf(defaultStream::error_stream(),
2736 "Invalid maximum code cache size: %s.\n", option->optionString);
2737 return JNI_EINVAL;
2738 }
2739 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 // -green
2743 } else if (match_option(option, "-green")) {
2744 jio_fprintf(defaultStream::error_stream(),
2745 "Green threads support not available\n");
2746 return JNI_EINVAL;
2747 // -native
2748 } else if (match_option(option, "-native")) {
2749 // HotSpot always uses native threads, ignore silently for compatibility
2750 // -Xrs
2751 } else if (match_option(option, "-Xrs")) {
2752 // Classic/EVM option, new functionality
2753 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 // -Xprof
2757 } else if (match_option(option, "-Xprof")) {
2758 char version[256];
2759 // Obsolete in JDK 10
2760 JDK_Version::jdk(10).to_string(version, sizeof(version));
2761 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2762 // -Xinternalversion
2763 } else if (match_option(option, "-Xinternalversion")) {
2764 jio_fprintf(defaultStream::output_stream(), "%s\n",
2765 VM_Version::internal_vm_info_string());
2766 vm_exit(0);
2767 #ifndef PRODUCT
2768 // -Xprintflags
2769 } else if (match_option(option, "-Xprintflags")) {
2770 JVMFlag::printFlags(tty, false);
2771 vm_exit(0);
2772 #endif
2773 // -D
2774 } else if (match_option(option, "-D", &tail)) {
2775 const char* value;
2776 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2777 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2778 // abort if -Djava.endorsed.dirs is set
2779 jio_fprintf(defaultStream::output_stream(),
2780 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2781 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2782 return JNI_EINVAL;
2783 }
2784 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2785 *value != '\0' && strcmp(value, "\"\"") != 0) {
2786 // abort if -Djava.ext.dirs is set
2787 jio_fprintf(defaultStream::output_stream(),
2788 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2789 return JNI_EINVAL;
2790 }
2791 // Check for module related properties. They must be set using the modules
2792 // options. For example: use "--add-modules=java.sql", not
2793 // "-Djdk.module.addmods=java.sql"
2794 if (is_internal_module_property(option->optionString + 2)) {
2795 needs_module_property_warning = true;
2796 continue;
2797 }
2798 if (!add_property(tail)) {
2799 return JNI_ENOMEM;
2800 }
2801 // Out of the box management support
2802 if (match_option(option, "-Dcom.sun.management", &tail)) {
2803 #if INCLUDE_MANAGEMENT
2804 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2805 return JNI_EINVAL;
2806 }
2807 // management agent in module jdk.management.agent
2808 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2809 return JNI_ENOMEM;
2810 }
2811 #else
2812 jio_fprintf(defaultStream::output_stream(),
2813 "-Dcom.sun.management is not supported in this VM.\n");
2814 return JNI_ERR;
2815 #endif
2816 }
2817 // -Xint
2818 } else if (match_option(option, "-Xint")) {
2819 set_mode_flags(_int);
2820 // -Xmixed
2821 } else if (match_option(option, "-Xmixed")) {
2822 set_mode_flags(_mixed);
2823 // -Xcomp
2824 } else if (match_option(option, "-Xcomp")) {
2825 // for testing the compiler; turn off all flags that inhibit compilation
2826 set_mode_flags(_comp);
2827 // -Xshare:dump
2828 } else if (match_option(option, "-Xshare:dump")) {
2829 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2830 return JNI_EINVAL;
2831 }
2832 // -Xshare:on
2833 } else if (match_option(option, "-Xshare:on")) {
2834 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2838 return JNI_EINVAL;
2839 }
2840 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2841 } else if (match_option(option, "-Xshare:auto")) {
2842 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2843 return JNI_EINVAL;
2844 }
2845 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2846 return JNI_EINVAL;
2847 }
2848 // -Xshare:off
2849 } else if (match_option(option, "-Xshare:off")) {
2850 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2851 return JNI_EINVAL;
2852 }
2853 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 // -Xverify
2857 } else if (match_option(option, "-Xverify", &tail)) {
2858 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2859 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 } else if (strcmp(tail, ":remote") == 0) {
2866 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2870 return JNI_EINVAL;
2871 }
2872 } else if (strcmp(tail, ":none") == 0) {
2873 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2874 return JNI_EINVAL;
2875 }
2876 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2877 return JNI_EINVAL;
2878 }
2879 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2880 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2881 return JNI_EINVAL;
2882 }
2883 // -Xdebug
2884 } else if (match_option(option, "-Xdebug")) {
2885 // note this flag has been used, then ignore
2886 set_xdebug_mode(true);
2887 // -Xnoagent
2888 } else if (match_option(option, "-Xnoagent")) {
2889 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2890 } else if (match_option(option, "-Xloggc:", &tail)) {
2891 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2892 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2893 _gc_log_filename = os::strdup_check_oom(tail);
2894 } else if (match_option(option, "-Xlog", &tail)) {
2895 bool ret = false;
2896 if (strcmp(tail, ":help") == 0) {
2897 fileStream stream(defaultStream::output_stream());
2898 LogConfiguration::print_command_line_help(&stream);
2899 vm_exit(0);
2900 } else if (strcmp(tail, ":disable") == 0) {
2901 LogConfiguration::disable_logging();
2902 ret = true;
2903 } else if (*tail == '\0') {
2904 ret = LogConfiguration::parse_command_line_arguments();
2905 assert(ret, "-Xlog without arguments should never fail to parse");
2906 } else if (*tail == ':') {
2907 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2908 }
2909 if (ret == false) {
2910 jio_fprintf(defaultStream::error_stream(),
2911 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2912 tail);
2913 return JNI_EINVAL;
2914 }
2915 // JNI hooks
2916 } else if (match_option(option, "-Xcheck", &tail)) {
2917 if (!strcmp(tail, ":jni")) {
2918 #if !INCLUDE_JNI_CHECK
2919 warning("JNI CHECKING is not supported in this VM");
2920 #else
2921 CheckJNICalls = true;
2922 #endif // INCLUDE_JNI_CHECK
2923 } else if (is_bad_option(option, args->ignoreUnrecognized,
2924 "check")) {
2925 return JNI_EINVAL;
2926 }
2927 } else if (match_option(option, "vfprintf")) {
2928 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2929 } else if (match_option(option, "exit")) {
2930 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2931 } else if (match_option(option, "abort")) {
2932 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2933 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2934 // and the last option wins.
2935 } else if (match_option(option, "-XX:+NeverTenure")) {
2936 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2943 return JNI_EINVAL;
2944 }
2945 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2946 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2947 return JNI_EINVAL;
2948 }
2949 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2950 return JNI_EINVAL;
2951 }
2952 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2953 return JNI_EINVAL;
2954 }
2955 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2956 uintx max_tenuring_thresh = 0;
2957 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2958 jio_fprintf(defaultStream::error_stream(),
2959 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2960 return JNI_EINVAL;
2961 }
2962
2963 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966
2967 if (MaxTenuringThreshold == 0) {
2968 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2969 return JNI_EINVAL;
2970 }
2971 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2972 return JNI_EINVAL;
2973 }
2974 } else {
2975 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2976 return JNI_EINVAL;
2977 }
2978 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2979 return JNI_EINVAL;
2980 }
2981 }
2982 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2983 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2987 return JNI_EINVAL;
2988 }
2989 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2990 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2991 return JNI_EINVAL;
2992 }
2993 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2994 return JNI_EINVAL;
2995 }
2996 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2997 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2998 return JNI_EINVAL;
2999 }
3000 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
3004 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
3005 return JNI_EINVAL;
3006 }
3007 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3011 #if defined(DTRACE_ENABLED)
3012 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
3016 return JNI_EINVAL;
3017 }
3018 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
3019 return JNI_EINVAL;
3020 }
3021 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
3022 return JNI_EINVAL;
3023 }
3024 #else // defined(DTRACE_ENABLED)
3025 jio_fprintf(defaultStream::error_stream(),
3026 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3027 return JNI_EINVAL;
3028 #endif // defined(DTRACE_ENABLED)
3029 #ifdef ASSERT
3030 } else if (match_option(option, "-XX:+FullGCALot")) {
3031 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
3032 return JNI_EINVAL;
3033 }
3034 // disable scavenge before parallel mark-compact
3035 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
3036 return JNI_EINVAL;
3037 }
3038 #endif
3039 #if !INCLUDE_MANAGEMENT
3040 } else if (match_option(option, "-XX:+ManagementServer")) {
3041 jio_fprintf(defaultStream::error_stream(),
3042 "ManagementServer is not supported in this VM.\n");
3043 return JNI_ERR;
3044 #endif // INCLUDE_MANAGEMENT
3045 #if INCLUDE_JVMCI
3046 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
3047 if (EnableJVMCIProduct) {
3048 jio_fprintf(defaultStream::error_stream(),
3049 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
3050 return JNI_EINVAL;
3051 }
3052 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
3053 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before
3054 if (EnableJVMCIProduct) {
3055 continue;
3056 }
3057 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
3058 // Allow this flag if it has been unlocked.
3059 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
3060 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
3061 jio_fprintf(defaultStream::error_stream(),
3062 "Unable to enable JVMCI in product mode");
3063 return JNI_ERR;
3064 }
3065 }
3066 // The flag was locked so process normally to report that error
3067 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
3068 return JNI_EINVAL;
3069 }
3070 #endif // INCLUDE_JVMCI
3071 #if INCLUDE_JFR
3072 } else if (match_jfr_option(&option)) {
3073 return JNI_EINVAL;
3074 #endif
3075 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3076 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3077 // already been handled
3078 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3079 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3080 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3081 return JNI_EINVAL;
3082 }
3083 }
3084 // Unknown option
3085 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3086 return JNI_ERR;
3087 }
3088 }
3089
3090 // PrintSharedArchiveAndExit will turn on
3091 // -Xshare:on
3092 // -Xlog:class+path=info
3093 if (PrintSharedArchiveAndExit) {
3094 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3095 return JNI_EINVAL;
3096 }
3097 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3098 return JNI_EINVAL;
3099 }
3100 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3101 }
3102
3103 fix_appclasspath();
3104
3105 return JNI_OK;
3106 }
3107
3108 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3109 // For java.base check for duplicate --patch-module options being specified on the command line.
3110 // This check is only required for java.base, all other duplicate module specifications
3111 // will be checked during module system initialization. The module system initialization
3112 // will throw an ExceptionInInitializerError if this situation occurs.
3113 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3114 if (*patch_mod_javabase) {
3115 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3116 } else {
3117 *patch_mod_javabase = true;
3118 }
3119 }
3120
3121 // Create GrowableArray lazily, only if --patch-module has been specified
3122 if (_patch_mod_prefix == NULL) {
3123 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3124 }
3125
3126 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3127 }
3128
3129 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3130 //
3131 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3132 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3133 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3134 // path is treated as the current directory.
3135 //
3136 // This causes problems with CDS, which requires that all directories specified in the classpath
3137 // must be empty. In most cases, applications do NOT want to load classes from the current
3138 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3139 // scripts compatible with CDS.
3140 void Arguments::fix_appclasspath() {
3141 if (IgnoreEmptyClassPaths) {
3142 const char separator = *os::path_separator();
3143 const char* src = _java_class_path->value();
3144
3145 // skip over all the leading empty paths
3146 while (*src == separator) {
3147 src ++;
3148 }
3149
3150 char* copy = os::strdup_check_oom(src, mtArguments);
3151
3152 // trim all trailing empty paths
3153 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3154 *tail = '\0';
3155 }
3156
3157 char from[3] = {separator, separator, '\0'};
3158 char to [2] = {separator, '\0'};
3159 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3160 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3161 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3162 }
3163
3164 _java_class_path->set_writeable_value(copy);
3165 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3166 }
3167 }
3168
3169 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3170 // check if the default lib/endorsed directory exists; if so, error
3171 char path[JVM_MAXPATHLEN];
3172 const char* fileSep = os::file_separator();
3173 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3174
3175 DIR* dir = os::opendir(path);
3176 if (dir != NULL) {
3177 jio_fprintf(defaultStream::output_stream(),
3178 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3179 "in modular form will be supported via the concept of upgradeable modules.\n");
3180 os::closedir(dir);
3181 return JNI_ERR;
3182 }
3183
3184 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3185 dir = os::opendir(path);
3186 if (dir != NULL) {
3187 jio_fprintf(defaultStream::output_stream(),
3188 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3189 "Use -classpath instead.\n.");
3190 os::closedir(dir);
3191 return JNI_ERR;
3192 }
3193
3194 // This must be done after all arguments have been processed
3195 // and the container support has been initialized since AggressiveHeap
3196 // relies on the amount of total memory available.
3197 if (AggressiveHeap) {
3198 jint result = set_aggressive_heap_flags();
3199 if (result != JNI_OK) {
3200 return result;
3201 }
3202 }
3203
3204 // This must be done after all arguments have been processed.
3205 // java_compiler() true means set to "NONE" or empty.
3206 if (java_compiler() && !xdebug_mode()) {
3207 // For backwards compatibility, we switch to interpreted mode if
3208 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3209 // not specified.
3210 set_mode_flags(_int);
3211 }
3212
3213 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3214 // but like -Xint, leave compilation thresholds unaffected.
3215 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3216 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3217 set_mode_flags(_int);
3218 }
3219
3220 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3221 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3222 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3223 }
3224
3225 #if !COMPILER2_OR_JVMCI
3226 // Don't degrade server performance for footprint
3227 if (FLAG_IS_DEFAULT(UseLargePages) &&
3228 MaxHeapSize < LargePageHeapSizeThreshold) {
3229 // No need for large granularity pages w/small heaps.
3230 // Note that large pages are enabled/disabled for both the
3231 // Java heap and the code cache.
3232 FLAG_SET_DEFAULT(UseLargePages, false);
3233 }
3234
3235 UNSUPPORTED_OPTION(ProfileInterpreter);
3236 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3237 #endif
3238
3239
3240 #ifdef TIERED
3241 // Parse the CompilationMode flag
3242 if (!CompilationModeFlag::initialize()) {
3243 return JNI_ERR;
3244 }
3245 #else
3246 // Tiered compilation is undefined.
3247 UNSUPPORTED_OPTION(TieredCompilation);
3248 #endif
3249
3250 if (!check_vm_args_consistency()) {
3251 return JNI_ERR;
3252 }
3253
3254 #if INCLUDE_CDS
3255 if (DumpSharedSpaces) {
3256 // Disable biased locking now as it interferes with the clean up of
3257 // the archived Klasses and Java string objects (at dump time only).
3258 UseBiasedLocking = false;
3259
3260 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3261 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3262 // compiler just to be safe.
3263 //
3264 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3265 // instead of modifying them in place. The copy is inaccessible to the compiler.
3266 // TODO: revisit the following for the static archive case.
3267 set_mode_flags(_int);
3268 }
3269 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3270 // Always verify non-system classes during CDS dump
3271 if (!BytecodeVerificationRemote) {
3272 BytecodeVerificationRemote = true;
3273 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3274 }
3275 }
3276 if (ArchiveClassesAtExit == NULL) {
3277 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3278 }
3279 if (UseSharedSpaces && patch_mod_javabase) {
3280 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3281 }
3282 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3283 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3284 }
3285 #endif
3286
3287 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3288 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3289 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3290
3291 return JNI_OK;
3292 }
3293
3294 // Helper class for controlling the lifetime of JavaVMInitArgs
3295 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3296 // deleted on the destruction of the ScopedVMInitArgs object.
3297 class ScopedVMInitArgs : public StackObj {
3298 private:
3299 JavaVMInitArgs _args;
3300 char* _container_name;
3301 bool _is_set;
3302 char* _vm_options_file_arg;
3303
3304 public:
3305 ScopedVMInitArgs(const char *container_name) {
3306 _args.version = JNI_VERSION_1_2;
3307 _args.nOptions = 0;
3308 _args.options = NULL;
3309 _args.ignoreUnrecognized = false;
3310 _container_name = (char *)container_name;
3311 _is_set = false;
3312 _vm_options_file_arg = NULL;
3313 }
3314
3315 // Populates the JavaVMInitArgs object represented by this
3316 // ScopedVMInitArgs object with the arguments in options. The
3317 // allocated memory is deleted by the destructor. If this method
3318 // returns anything other than JNI_OK, then this object is in a
3319 // partially constructed state, and should be abandoned.
3320 jint set_args(GrowableArray<JavaVMOption>* options) {
3321 _is_set = true;
3322 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3323 JavaVMOption, options->length(), mtArguments);
3324 if (options_arr == NULL) {
3325 return JNI_ENOMEM;
3326 }
3327 _args.options = options_arr;
3328
3329 for (int i = 0; i < options->length(); i++) {
3330 options_arr[i] = options->at(i);
3331 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3332 if (options_arr[i].optionString == NULL) {
3333 // Rely on the destructor to do cleanup.
3334 _args.nOptions = i;
3335 return JNI_ENOMEM;
3336 }
3337 }
3338
3339 _args.nOptions = options->length();
3340 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3341 return JNI_OK;
3342 }
3343
3344 JavaVMInitArgs* get() { return &_args; }
3345 char* container_name() { return _container_name; }
3346 bool is_set() { return _is_set; }
3347 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3348 char* vm_options_file_arg() { return _vm_options_file_arg; }
3349
3350 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3351 if (_vm_options_file_arg != NULL) {
3352 os::free(_vm_options_file_arg);
3353 }
3354 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3355 }
3356
3357 ~ScopedVMInitArgs() {
3358 if (_vm_options_file_arg != NULL) {
3359 os::free(_vm_options_file_arg);
3360 }
3361 if (_args.options == NULL) return;
3362 for (int i = 0; i < _args.nOptions; i++) {
3363 os::free(_args.options[i].optionString);
3364 }
3365 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3366 }
3367
3368 // Insert options into this option list, to replace option at
3369 // vm_options_file_pos (-XX:VMOptionsFile)
3370 jint insert(const JavaVMInitArgs* args,
3371 const JavaVMInitArgs* args_to_insert,
3372 const int vm_options_file_pos) {
3373 assert(_args.options == NULL, "shouldn't be set yet");
3374 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3375 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3376
3377 int length = args->nOptions + args_to_insert->nOptions - 1;
3378 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3379 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3380 for (int i = 0; i < args->nOptions; i++) {
3381 if (i == vm_options_file_pos) {
3382 // insert the new options starting at the same place as the
3383 // -XX:VMOptionsFile option
3384 for (int j = 0; j < args_to_insert->nOptions; j++) {
3385 options->push(args_to_insert->options[j]);
3386 }
3387 } else {
3388 options->push(args->options[i]);
3389 }
3390 }
3391 // make into options array
3392 jint result = set_args(options);
3393 delete options;
3394 return result;
3395 }
3396 };
3397
3398 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3399 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3400 }
3401
3402 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3403 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3404 }
3405
3406 jint Arguments::parse_options_environment_variable(const char* name,
3407 ScopedVMInitArgs* vm_args) {
3408 char *buffer = ::getenv(name);
3409
3410 // Don't check this environment variable if user has special privileges
3411 // (e.g. unix su command).
3412 if (buffer == NULL || os::have_special_privileges()) {
3413 return JNI_OK;
3414 }
3415
3416 if ((buffer = os::strdup(buffer)) == NULL) {
3417 return JNI_ENOMEM;
3418 }
3419
3420 jio_fprintf(defaultStream::error_stream(),
3421 "Picked up %s: %s\n", name, buffer);
3422
3423 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3424
3425 os::free(buffer);
3426 return retcode;
3427 }
3428
3429 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3430 // read file into buffer
3431 int fd = ::open(file_name, O_RDONLY);
3432 if (fd < 0) {
3433 jio_fprintf(defaultStream::error_stream(),
3434 "Could not open options file '%s'\n",
3435 file_name);
3436 return JNI_ERR;
3437 }
3438
3439 struct stat stbuf;
3440 int retcode = os::stat(file_name, &stbuf);
3441 if (retcode != 0) {
3442 jio_fprintf(defaultStream::error_stream(),
3443 "Could not stat options file '%s'\n",
3444 file_name);
3445 os::close(fd);
3446 return JNI_ERR;
3447 }
3448
3449 if (stbuf.st_size == 0) {
3450 // tell caller there is no option data and that is ok
3451 os::close(fd);
3452 return JNI_OK;
3453 }
3454
3455 // '+ 1' for NULL termination even with max bytes
3456 size_t bytes_alloc = stbuf.st_size + 1;
3457
3458 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3459 if (NULL == buf) {
3460 jio_fprintf(defaultStream::error_stream(),
3461 "Could not allocate read buffer for options file parse\n");
3462 os::close(fd);
3463 return JNI_ENOMEM;
3464 }
3465
3466 memset(buf, 0, bytes_alloc);
3467
3468 // Fill buffer
3469 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3470 os::close(fd);
3471 if (bytes_read < 0) {
3472 FREE_C_HEAP_ARRAY(char, buf);
3473 jio_fprintf(defaultStream::error_stream(),
3474 "Could not read options file '%s'\n", file_name);
3475 return JNI_ERR;
3476 }
3477
3478 if (bytes_read == 0) {
3479 // tell caller there is no option data and that is ok
3480 FREE_C_HEAP_ARRAY(char, buf);
3481 return JNI_OK;
3482 }
3483
3484 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3485
3486 FREE_C_HEAP_ARRAY(char, buf);
3487 return retcode;
3488 }
3489
3490 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3491 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3492
3493 // some pointers to help with parsing
3494 char *buffer_end = buffer + buf_len;
3495 char *opt_hd = buffer;
3496 char *wrt = buffer;
3497 char *rd = buffer;
3498
3499 // parse all options
3500 while (rd < buffer_end) {
3501 // skip leading white space from the input string
3502 while (rd < buffer_end && isspace(*rd)) {
3503 rd++;
3504 }
3505
3506 if (rd >= buffer_end) {
3507 break;
3508 }
3509
3510 // Remember this is where we found the head of the token.
3511 opt_hd = wrt;
3512
3513 // Tokens are strings of non white space characters separated
3514 // by one or more white spaces.
3515 while (rd < buffer_end && !isspace(*rd)) {
3516 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3517 int quote = *rd; // matching quote to look for
3518 rd++; // don't copy open quote
3519 while (rd < buffer_end && *rd != quote) {
3520 // include everything (even spaces)
3521 // up until the close quote
3522 *wrt++ = *rd++; // copy to option string
3523 }
3524
3525 if (rd < buffer_end) {
3526 rd++; // don't copy close quote
3527 } else {
3528 // did not see closing quote
3529 jio_fprintf(defaultStream::error_stream(),
3530 "Unmatched quote in %s\n", name);
3531 delete options;
3532 return JNI_ERR;
3533 }
3534 } else {
3535 *wrt++ = *rd++; // copy to option string
3536 }
3537 }
3538
3539 // steal a white space character and set it to NULL
3540 *wrt++ = '\0';
3541 // We now have a complete token
3542
3543 JavaVMOption option;
3544 option.optionString = opt_hd;
3545 option.extraInfo = NULL;
3546
3547 options->append(option); // Fill in option
3548
3549 rd++; // Advance to next character
3550 }
3551
3552 // Fill out JavaVMInitArgs structure.
3553 jint status = vm_args->set_args(options);
3554
3555 delete options;
3556 return status;
3557 }
3558
3559 jint Arguments::set_shared_spaces_flags_and_archive_paths() {
3560 if (DumpSharedSpaces) {
3561 if (RequireSharedSpaces) {
3562 warning("Cannot dump shared archive while using shared archive");
3563 }
3564 UseSharedSpaces = false;
3565 }
3566 #if INCLUDE_CDS
3567 // Initialize shared archive paths which could include both base and dynamic archive paths
3568 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3569 if (!init_shared_archive_paths()) {
3570 return JNI_ENOMEM;
3571 }
3572 #endif // INCLUDE_CDS
3573 return JNI_OK;
3574 }
3575
3576 #if INCLUDE_CDS
3577 // Sharing support
3578 // Construct the path to the archive
3579 char* Arguments::get_default_shared_archive_path() {
3580 char *default_archive_path;
3581 char jvm_path[JVM_MAXPATHLEN];
3582 os::jvm_path(jvm_path, sizeof(jvm_path));
3583 char *end = strrchr(jvm_path, *os::file_separator());
3584 if (end != NULL) *end = '\0';
3585 size_t jvm_path_len = strlen(jvm_path);
3586 size_t file_sep_len = strlen(os::file_separator());
3587 const size_t len = jvm_path_len + file_sep_len + 20;
3588 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3589 jio_snprintf(default_archive_path, len,
3590 UseCompressedOops ? "%s%sclasses.jsa": "%s%sclasses_nocoops.jsa",
3591 jvm_path, os::file_separator());
3592 return default_archive_path;
3593 }
3594
3595 int Arguments::num_archives(const char* archive_path) {
3596 if (archive_path == NULL) {
3597 return 0;
3598 }
3599 int npaths = 1;
3600 char* p = (char*)archive_path;
3601 while (*p != '\0') {
3602 if (*p == os::path_separator()[0]) {
3603 npaths++;
3604 }
3605 p++;
3606 }
3607 return npaths;
3608 }
3609
3610 void Arguments::extract_shared_archive_paths(const char* archive_path,
3611 char** base_archive_path,
3612 char** top_archive_path) {
3613 char* begin_ptr = (char*)archive_path;
3614 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3615 if (end_ptr == NULL || end_ptr == begin_ptr) {
3616 vm_exit_during_initialization("Base archive was not specified", archive_path);
3617 }
3618 size_t len = end_ptr - begin_ptr;
3619 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3620 strncpy(cur_path, begin_ptr, len);
3621 cur_path[len] = '\0';
3622 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3623 *base_archive_path = cur_path;
3624
3625 begin_ptr = ++end_ptr;
3626 if (*begin_ptr == '\0') {
3627 vm_exit_during_initialization("Top archive was not specified", archive_path);
3628 }
3629 end_ptr = strchr(begin_ptr, '\0');
3630 assert(end_ptr != NULL, "sanity");
3631 len = end_ptr - begin_ptr;
3632 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3633 strncpy(cur_path, begin_ptr, len + 1);
3634 //cur_path[len] = '\0';
3635 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3636 *top_archive_path = cur_path;
3637 }
3638
3639 bool Arguments::init_shared_archive_paths() {
3640 if (ArchiveClassesAtExit != NULL) {
3641 if (DumpSharedSpaces) {
3642 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3643 }
3644 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3645 return false;
3646 }
3647 check_unsupported_dumping_properties();
3648 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3649 }
3650 if (SharedArchiveFile == NULL) {
3651 SharedArchivePath = get_default_shared_archive_path();
3652 } else {
3653 int archives = num_archives(SharedArchiveFile);
3654 if (is_dumping_archive()) {
3655 if (archives > 1) {
3656 vm_exit_during_initialization(
3657 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3658 }
3659 if (DynamicDumpSharedSpaces) {
3660 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3661 vm_exit_during_initialization(
3662 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3663 SharedArchiveFile);
3664 }
3665 }
3666 }
3667 if (!is_dumping_archive()){
3668 if (archives > 2) {
3669 vm_exit_during_initialization(
3670 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3671 }
3672 if (archives == 1) {
3673 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3674 int name_size;
3675 bool success =
3676 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3677 if (!success) {
3678 SharedArchivePath = temp_archive_path;
3679 } else {
3680 SharedDynamicArchivePath = temp_archive_path;
3681 }
3682 } else {
3683 extract_shared_archive_paths((const char*)SharedArchiveFile,
3684 &SharedArchivePath, &SharedDynamicArchivePath);
3685 }
3686 } else { // CDS dumping
3687 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3688 }
3689 }
3690 return (SharedArchivePath != NULL);
3691 }
3692 #endif // INCLUDE_CDS
3693
3694 #ifndef PRODUCT
3695 // Determine whether LogVMOutput should be implicitly turned on.
3696 static bool use_vm_log() {
3697 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3698 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3699 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3700 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3701 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3702 return true;
3703 }
3704
3705 #ifdef COMPILER1
3706 if (PrintC1Statistics) {
3707 return true;
3708 }
3709 #endif // COMPILER1
3710
3711 #ifdef COMPILER2
3712 if (PrintOptoAssembly || PrintOptoStatistics) {
3713 return true;
3714 }
3715 #endif // COMPILER2
3716
3717 return false;
3718 }
3719
3720 #endif // PRODUCT
3721
3722 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3723 for (int index = 0; index < args->nOptions; index++) {
3724 const JavaVMOption* option = args->options + index;
3725 const char* tail;
3726 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3727 return true;
3728 }
3729 }
3730 return false;
3731 }
3732
3733 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3734 const char* vm_options_file,
3735 const int vm_options_file_pos,
3736 ScopedVMInitArgs* vm_options_file_args,
3737 ScopedVMInitArgs* args_out) {
3738 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3739 if (code != JNI_OK) {
3740 return code;
3741 }
3742
3743 if (vm_options_file_args->get()->nOptions < 1) {
3744 return JNI_OK;
3745 }
3746
3747 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3748 jio_fprintf(defaultStream::error_stream(),
3749 "A VM options file may not refer to a VM options file. "
3750 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3751 "options file '%s' in options container '%s' is an error.\n",
3752 vm_options_file_args->vm_options_file_arg(),
3753 vm_options_file_args->container_name());
3754 return JNI_EINVAL;
3755 }
3756
3757 return args_out->insert(args, vm_options_file_args->get(),
3758 vm_options_file_pos);
3759 }
3760
3761 // Expand -XX:VMOptionsFile found in args_in as needed.
3762 // mod_args and args_out parameters may return values as needed.
3763 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3764 ScopedVMInitArgs* mod_args,
3765 JavaVMInitArgs** args_out) {
3766 jint code = match_special_option_and_act(args_in, mod_args);
3767 if (code != JNI_OK) {
3768 return code;
3769 }
3770
3771 if (mod_args->is_set()) {
3772 // args_in contains -XX:VMOptionsFile and mod_args contains the
3773 // original options from args_in along with the options expanded
3774 // from the VMOptionsFile. Return a short-hand to the caller.
3775 *args_out = mod_args->get();
3776 } else {
3777 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3778 }
3779 return JNI_OK;
3780 }
3781
3782 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3783 ScopedVMInitArgs* args_out) {
3784 // Remaining part of option string
3785 const char* tail;
3786 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3787
3788 for (int index = 0; index < args->nOptions; index++) {
3789 const JavaVMOption* option = args->options + index;
3790 if (match_option(option, "-XX:Flags=", &tail)) {
3791 Arguments::set_jvm_flags_file(tail);
3792 continue;
3793 }
3794 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3795 if (vm_options_file_args.found_vm_options_file_arg()) {
3796 jio_fprintf(defaultStream::error_stream(),
3797 "The option '%s' is already specified in the options "
3798 "container '%s' so the specification of '%s' in the "
3799 "same options container is an error.\n",
3800 vm_options_file_args.vm_options_file_arg(),
3801 vm_options_file_args.container_name(),
3802 option->optionString);
3803 return JNI_EINVAL;
3804 }
3805 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3806 // If there's a VMOptionsFile, parse that
3807 jint code = insert_vm_options_file(args, tail, index,
3808 &vm_options_file_args, args_out);
3809 if (code != JNI_OK) {
3810 return code;
3811 }
3812 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3813 if (args_out->is_set()) {
3814 // The VMOptions file inserted some options so switch 'args'
3815 // to the new set of options, and continue processing which
3816 // preserves "last option wins" semantics.
3817 args = args_out->get();
3818 // The first option from the VMOptionsFile replaces the
3819 // current option. So we back track to process the
3820 // replacement option.
3821 index--;
3822 }
3823 continue;
3824 }
3825 if (match_option(option, "-XX:+PrintVMOptions")) {
3826 PrintVMOptions = true;
3827 continue;
3828 }
3829 if (match_option(option, "-XX:-PrintVMOptions")) {
3830 PrintVMOptions = false;
3831 continue;
3832 }
3833 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3834 IgnoreUnrecognizedVMOptions = true;
3835 continue;
3836 }
3837 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3838 IgnoreUnrecognizedVMOptions = false;
3839 continue;
3840 }
3841 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3842 JVMFlag::printFlags(tty, false);
3843 vm_exit(0);
3844 }
3845 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3846 #if INCLUDE_NMT
3847 // The launcher did not setup nmt environment variable properly.
3848 if (!MemTracker::check_launcher_nmt_support(tail)) {
3849 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3850 }
3851
3852 // Verify if nmt option is valid.
3853 if (MemTracker::verify_nmt_option()) {
3854 // Late initialization, still in single-threaded mode.
3855 if (MemTracker::tracking_level() >= NMT_summary) {
3856 MemTracker::init();
3857 }
3858 } else {
3859 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3860 }
3861 continue;
3862 #else
3863 jio_fprintf(defaultStream::error_stream(),
3864 "Native Memory Tracking is not supported in this VM\n");
3865 return JNI_ERR;
3866 #endif
3867 }
3868
3869 #ifndef PRODUCT
3870 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3871 JVMFlag::printFlags(tty, true);
3872 vm_exit(0);
3873 }
3874 #endif
3875 }
3876 return JNI_OK;
3877 }
3878
3879 static void print_options(const JavaVMInitArgs *args) {
3880 const char* tail;
3881 for (int index = 0; index < args->nOptions; index++) {
3882 const JavaVMOption *option = args->options + index;
3883 if (match_option(option, "-XX:", &tail)) {
3884 logOption(tail);
3885 }
3886 }
3887 }
3888
3889 bool Arguments::handle_deprecated_print_gc_flags() {
3890 if (PrintGC) {
3891 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3892 }
3893 if (PrintGCDetails) {
3894 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3895 }
3896
3897 if (_gc_log_filename != NULL) {
3898 // -Xloggc was used to specify a filename
3899 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3900
3901 LogTarget(Error, logging) target;
3902 LogStream errstream(target);
3903 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3904 } else if (PrintGC || PrintGCDetails) {
3905 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3906 }
3907 return true;
3908 }
3909
3910 // Parse entry point called from JNI_CreateJavaVM
3911
3912 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3913 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3914
3915 // Initialize ranges and constraints
3916 JVMFlagRangeList::init();
3917 JVMFlagConstraintList::init();
3918
3919 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3920 const char* hotspotrc = ".hotspotrc";
3921 bool settings_file_specified = false;
3922 bool needs_hotspotrc_warning = false;
3923 ScopedVMInitArgs initial_vm_options_args("");
3924 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3925 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3926
3927 // Pointers to current working set of containers
3928 JavaVMInitArgs* cur_cmd_args;
3929 JavaVMInitArgs* cur_vm_options_args;
3930 JavaVMInitArgs* cur_java_options_args;
3931 JavaVMInitArgs* cur_java_tool_options_args;
3932
3933 // Containers for modified/expanded options
3934 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3935 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3936 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3937 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3938
3939
3940 jint code =
3941 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3942 if (code != JNI_OK) {
3943 return code;
3944 }
3945
3946 code = parse_java_options_environment_variable(&initial_java_options_args);
3947 if (code != JNI_OK) {
3948 return code;
3949 }
3950
3951 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3952 char *vmoptions = ClassLoader::lookup_vm_options();
3953 if (vmoptions != NULL) {
3954 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3955 FREE_C_HEAP_ARRAY(char, vmoptions);
3956 if (code != JNI_OK) {
3957 return code;
3958 }
3959 }
3960
3961 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3962 &mod_java_tool_options_args,
3963 &cur_java_tool_options_args);
3964 if (code != JNI_OK) {
3965 return code;
3966 }
3967
3968 code = expand_vm_options_as_needed(initial_cmd_args,
3969 &mod_cmd_args,
3970 &cur_cmd_args);
3971 if (code != JNI_OK) {
3972 return code;
3973 }
3974
3975 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3976 &mod_java_options_args,
3977 &cur_java_options_args);
3978 if (code != JNI_OK) {
3979 return code;
3980 }
3981
3982 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3983 &mod_vm_options_args,
3984 &cur_vm_options_args);
3985 if (code != JNI_OK) {
3986 return code;
3987 }
3988
3989 const char* flags_file = Arguments::get_jvm_flags_file();
3990 settings_file_specified = (flags_file != NULL);
3991
3992 if (IgnoreUnrecognizedVMOptions) {
3993 cur_cmd_args->ignoreUnrecognized = true;
3994 cur_java_tool_options_args->ignoreUnrecognized = true;
3995 cur_java_options_args->ignoreUnrecognized = true;
3996 }
3997
3998 // Parse specified settings file
3999 if (settings_file_specified) {
4000 if (!process_settings_file(flags_file, true,
4001 cur_cmd_args->ignoreUnrecognized)) {
4002 return JNI_EINVAL;
4003 }
4004 } else {
4005 #ifdef ASSERT
4006 // Parse default .hotspotrc settings file
4007 if (!process_settings_file(".hotspotrc", false,
4008 cur_cmd_args->ignoreUnrecognized)) {
4009 return JNI_EINVAL;
4010 }
4011 #else
4012 struct stat buf;
4013 if (os::stat(hotspotrc, &buf) == 0) {
4014 needs_hotspotrc_warning = true;
4015 }
4016 #endif
4017 }
4018
4019 if (PrintVMOptions) {
4020 print_options(cur_java_tool_options_args);
4021 print_options(cur_cmd_args);
4022 print_options(cur_java_options_args);
4023 }
4024
4025 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4026 jint result = parse_vm_init_args(cur_vm_options_args,
4027 cur_java_tool_options_args,
4028 cur_java_options_args,
4029 cur_cmd_args);
4030
4031 if (result != JNI_OK) {
4032 return result;
4033 }
4034
4035 // Delay warning until here so that we've had a chance to process
4036 // the -XX:-PrintWarnings flag
4037 if (needs_hotspotrc_warning) {
4038 warning("%s file is present but has been ignored. "
4039 "Run with -XX:Flags=%s to load the file.",
4040 hotspotrc, hotspotrc);
4041 }
4042
4043 if (needs_module_property_warning) {
4044 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4045 " names that are reserved for internal use.");
4046 }
4047
4048 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4049 UNSUPPORTED_OPTION(UseLargePages);
4050 #endif
4051
4052 #if defined(AIX)
4053 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
4054 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
4055 #endif
4056
4057 #ifndef PRODUCT
4058 if (TraceBytecodesAt != 0) {
4059 TraceBytecodes = true;
4060 }
4061 if (CountCompiledCalls) {
4062 if (UseCounterDecay) {
4063 warning("UseCounterDecay disabled because CountCalls is set");
4064 UseCounterDecay = false;
4065 }
4066 }
4067 #endif // PRODUCT
4068
4069 if (ScavengeRootsInCode == 0) {
4070 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4071 warning("Forcing ScavengeRootsInCode non-zero");
4072 }
4073 ScavengeRootsInCode = 1;
4074 }
4075
4076 if (!handle_deprecated_print_gc_flags()) {
4077 return JNI_EINVAL;
4078 }
4079
4080 // Set object alignment values.
4081 set_object_alignment();
4082
4083 #if !INCLUDE_CDS
4084 if (DumpSharedSpaces || RequireSharedSpaces) {
4085 jio_fprintf(defaultStream::error_stream(),
4086 "Shared spaces are not supported in this VM\n");
4087 return JNI_ERR;
4088 }
4089 if (DumpLoadedClassList != NULL) {
4090 jio_fprintf(defaultStream::error_stream(),
4091 "DumpLoadedClassList is not supported in this VM\n");
4092 return JNI_ERR;
4093 }
4094 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4095 log_is_enabled(Info, cds)) {
4096 warning("Shared spaces are not supported in this VM");
4097 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4098 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4099 }
4100 no_shared_spaces("CDS Disabled");
4101 #endif // INCLUDE_CDS
4102
4103 #ifndef TIERED
4104 if (FLAG_IS_CMDLINE(CompilationMode)) {
4105 warning("CompilationMode has no effect in non-tiered VMs");
4106 }
4107 #endif
4108
4109 return JNI_OK;
4110 }
4111
4112 jint Arguments::apply_ergo() {
4113 // Set flags based on ergonomics.
4114 jint result = set_ergonomics_flags();
4115 if (result != JNI_OK) return result;
4116
4117 // Set heap size based on available physical memory
4118 set_heap_size();
4119
4120 GCConfig::arguments()->initialize();
4121
4122 result = set_shared_spaces_flags_and_archive_paths();
4123 if (result != JNI_OK) return result;
4124
4125 // Initialize Metaspace flags and alignments
4126 Metaspace::ergo_initialize();
4127
4128 // Set compiler flags after GC is selected and GC specific
4129 // flags (LoopStripMiningIter) are set.
4130 CompilerConfig::ergo_initialize();
4131
4132 // Set bytecode rewriting flags
4133 set_bytecode_flags();
4134
4135 // Set flags if aggressive optimization flags are enabled
4136 jint code = set_aggressive_opts_flags();
4137 if (code != JNI_OK) {
4138 return code;
4139 }
4140
4141 // Turn off biased locking for locking debug mode flags,
4142 // which are subtly different from each other but neither works with
4143 // biased locking
4144 if (UseHeavyMonitors
4145 #ifdef COMPILER1
4146 || !UseFastLocking
4147 #endif // COMPILER1
4148 #if INCLUDE_JVMCI
4149 || !JVMCIUseFastLocking
4150 #endif
4151 ) {
4152 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4153 // flag set to true on command line; warn the user that they
4154 // can't enable biased locking here
4155 warning("Biased Locking is not supported with locking debug flags"
4156 "; ignoring UseBiasedLocking flag." );
4157 }
4158 UseBiasedLocking = false;
4159 }
4160
4161 #ifdef CC_INTERP
4162 // Clear flags not supported on zero.
4163 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4164 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4165 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4166 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4167 #endif // CC_INTERP
4168
4169 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4170 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4171 DebugNonSafepoints = true;
4172 }
4173
4174 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4175 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4176 }
4177
4178 // Treat the odd case where local verification is enabled but remote
4179 // verification is not as if both were enabled.
4180 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4181 log_info(verification)("Turning on remote verification because local verification is on");
4182 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4183 }
4184
4185 #ifndef PRODUCT
4186 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4187 if (use_vm_log()) {
4188 LogVMOutput = true;
4189 }
4190 }
4191 #endif // PRODUCT
4192
4193 if (PrintCommandLineFlags) {
4194 JVMFlag::printSetFlags(tty);
4195 }
4196
4197 // Apply CPU specific policy for the BiasedLocking
4198 if (UseBiasedLocking) {
4199 if (!VM_Version::use_biased_locking() &&
4200 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4201 UseBiasedLocking = false;
4202 }
4203 }
4204 #ifdef COMPILER2
4205 if (!UseBiasedLocking) {
4206 UseOptoBiasInlining = false;
4207 }
4208 #endif
4209
4210 return JNI_OK;
4211 }
4212
4213 jint Arguments::adjust_after_os() {
4214 if (UseNUMA) {
4215 if (UseParallelGC) {
4216 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4217 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4218 }
4219 }
4220 }
4221 return JNI_OK;
4222 }
4223
4224 int Arguments::PropertyList_count(SystemProperty* pl) {
4225 int count = 0;
4226 while(pl != NULL) {
4227 count++;
4228 pl = pl->next();
4229 }
4230 return count;
4231 }
4232
4233 // Return the number of readable properties.
4234 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4235 int count = 0;
4236 while(pl != NULL) {
4237 if (pl->is_readable()) {
4238 count++;
4239 }
4240 pl = pl->next();
4241 }
4242 return count;
4243 }
4244
4245 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4246 assert(key != NULL, "just checking");
4247 SystemProperty* prop;
4248 for (prop = pl; prop != NULL; prop = prop->next()) {
4249 if (strcmp(key, prop->key()) == 0) return prop->value();
4250 }
4251 return NULL;
4252 }
4253
4254 // Return the value of the requested property provided that it is a readable property.
4255 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4256 assert(key != NULL, "just checking");
4257 SystemProperty* prop;
4258 // Return the property value if the keys match and the property is not internal or
4259 // it's the special internal property "jdk.boot.class.path.append".
4260 for (prop = pl; prop != NULL; prop = prop->next()) {
4261 if (strcmp(key, prop->key()) == 0) {
4262 if (!prop->internal()) {
4263 return prop->value();
4264 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4265 return prop->value();
4266 } else {
4267 // Property is internal and not jdk.boot.class.path.append so return NULL.
4268 return NULL;
4269 }
4270 }
4271 }
4272 return NULL;
4273 }
4274
4275 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4276 int count = 0;
4277 const char* ret_val = NULL;
4278
4279 while(pl != NULL) {
4280 if(count >= index) {
4281 ret_val = pl->key();
4282 break;
4283 }
4284 count++;
4285 pl = pl->next();
4286 }
4287
4288 return ret_val;
4289 }
4290
4291 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4292 int count = 0;
4293 char* ret_val = NULL;
4294
4295 while(pl != NULL) {
4296 if(count >= index) {
4297 ret_val = pl->value();
4298 break;
4299 }
4300 count++;
4301 pl = pl->next();
4302 }
4303
4304 return ret_val;
4305 }
4306
4307 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4308 SystemProperty* p = *plist;
4309 if (p == NULL) {
4310 *plist = new_p;
4311 } else {
4312 while (p->next() != NULL) {
4313 p = p->next();
4314 }
4315 p->set_next(new_p);
4316 }
4317 }
4318
4319 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4320 bool writeable, bool internal) {
4321 if (plist == NULL)
4322 return;
4323
4324 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4325 PropertyList_add(plist, new_p);
4326 }
4327
4328 void Arguments::PropertyList_add(SystemProperty *element) {
4329 PropertyList_add(&_system_properties, element);
4330 }
4331
4332 // This add maintains unique property key in the list.
4333 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4334 PropertyAppendable append, PropertyWriteable writeable,
4335 PropertyInternal internal) {
4336 if (plist == NULL)
4337 return;
4338
4339 // If property key exists and is writeable, then update with new value.
4340 // Trying to update a non-writeable property is silently ignored.
4341 SystemProperty* prop;
4342 for (prop = *plist; prop != NULL; prop = prop->next()) {
4343 if (strcmp(k, prop->key()) == 0) {
4344 if (append == AppendProperty) {
4345 prop->append_writeable_value(v);
4346 } else {
4347 prop->set_writeable_value(v);
4348 }
4349 return;
4350 }
4351 }
4352
4353 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4354 }
4355
4356 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4357 // Returns true if all of the source pointed by src has been copied over to
4358 // the destination buffer pointed by buf. Otherwise, returns false.
4359 // Notes:
4360 // 1. If the length (buflen) of the destination buffer excluding the
4361 // NULL terminator character is not long enough for holding the expanded
4362 // pid characters, it also returns false instead of returning the partially
4363 // expanded one.
4364 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4365 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4366 char* buf, size_t buflen) {
4367 const char* p = src;
4368 char* b = buf;
4369 const char* src_end = &src[srclen];
4370 char* buf_end = &buf[buflen - 1];
4371
4372 while (p < src_end && b < buf_end) {
4373 if (*p == '%') {
4374 switch (*(++p)) {
4375 case '%': // "%%" ==> "%"
4376 *b++ = *p++;
4377 break;
4378 case 'p': { // "%p" ==> current process id
4379 // buf_end points to the character before the last character so
4380 // that we could write '\0' to the end of the buffer.
4381 size_t buf_sz = buf_end - b + 1;
4382 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4383
4384 // if jio_snprintf fails or the buffer is not long enough to hold
4385 // the expanded pid, returns false.
4386 if (ret < 0 || ret >= (int)buf_sz) {
4387 return false;
4388 } else {
4389 b += ret;
4390 assert(*b == '\0', "fail in copy_expand_pid");
4391 if (p == src_end && b == buf_end + 1) {
4392 // reach the end of the buffer.
4393 return true;
4394 }
4395 }
4396 p++;
4397 break;
4398 }
4399 default :
4400 *b++ = '%';
4401 }
4402 } else {
4403 *b++ = *p++;
4404 }
4405 }
4406 *b = '\0';
4407 return (p == src_end); // return false if not all of the source was copied
4408 }