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