1 /*
2 * Copyright (c) 1997, 2018, 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/collectorPolicy.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/flags/jvmFlag.hpp"
46 #include "runtime/flags/jvmFlagConstraintList.hpp"
47 #include "runtime/flags/jvmFlagWriteableList.hpp"
48 #include "runtime/flags/jvmFlagRangeList.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.inline.hpp"
52 #include "runtime/safepoint.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64 #if INCLUDE_JFR
65 #include "jfr/jfr.hpp"
66 #endif
67
68 // Note: This is a special bug reporting site for the JVM
69 #ifdef VENDOR_URL_VM_BUG
70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
71 #else
72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
73 #endif
74 #define DEFAULT_JAVA_LAUNCHER "generic"
75
76 char* Arguments::_jvm_flags_file = NULL;
77 char** Arguments::_jvm_flags_array = NULL;
78 int Arguments::_num_jvm_flags = 0;
79 char** Arguments::_jvm_args_array = NULL;
80 int Arguments::_num_jvm_args = 0;
81 char* Arguments::_java_command = NULL;
82 SystemProperty* Arguments::_system_properties = NULL;
83 const char* Arguments::_gc_log_filename = NULL;
84 size_t Arguments::_conservative_max_heap_alignment = 0;
85 size_t Arguments::_min_heap_size = 0;
86 Arguments::Mode Arguments::_mode = _mixed;
87 bool Arguments::_java_compiler = false;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 int Arguments::_sun_java_launcher_pid = -1;
92 bool Arguments::_sun_java_launcher_is_altjvm = false;
93
94 // These parameters are reset in method parse_vm_init_args()
95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
97 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
98 bool Arguments::_ClipInlining = ClipInlining;
99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
101
102 bool Arguments::_enable_preview = false;
103
104 char* Arguments::SharedArchivePath = NULL;
105
106 AgentLibraryList Arguments::_libraryList;
107 AgentLibraryList Arguments::_agentList;
108
109 abort_hook_t Arguments::_abort_hook = NULL;
110 exit_hook_t Arguments::_exit_hook = NULL;
111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = NULL;
115 SystemProperty *Arguments::_java_library_path = NULL;
116 SystemProperty *Arguments::_java_home = NULL;
117 SystemProperty *Arguments::_java_class_path = NULL;
118 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
119 SystemProperty *Arguments::_vm_info = NULL;
120
121 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
122 PathString *Arguments::_system_boot_class_path = NULL;
123 bool Arguments::_has_jimage = false;
124
125 char* Arguments::_ext_dirs = NULL;
126
127 bool PathString::set_value(const char *value) {
128 if (_value != NULL) {
129 FreeHeap(_value);
130 }
131 _value = AllocateHeap(strlen(value)+1, mtArguments);
132 assert(_value != NULL, "Unable to allocate space for new path value");
133 if (_value != NULL) {
134 strcpy(_value, value);
135 } else {
136 // not able to allocate
137 return false;
138 }
139 return true;
140 }
141
142 void PathString::append_value(const char *value) {
143 char *sp;
144 size_t len = 0;
145 if (value != NULL) {
146 len = strlen(value);
147 if (_value != NULL) {
148 len += strlen(_value);
149 }
150 sp = AllocateHeap(len+2, mtArguments);
151 assert(sp != NULL, "Unable to allocate space for new append path value");
152 if (sp != NULL) {
153 if (_value != NULL) {
154 strcpy(sp, _value);
155 strcat(sp, os::path_separator());
156 strcat(sp, value);
157 FreeHeap(_value);
158 } else {
159 strcpy(sp, value);
160 }
161 _value = sp;
162 }
163 }
164 }
165
166 PathString::PathString(const char* value) {
167 if (value == NULL) {
168 _value = NULL;
169 } else {
170 _value = AllocateHeap(strlen(value)+1, mtArguments);
171 strcpy(_value, value);
172 }
173 }
174
175 PathString::~PathString() {
176 if (_value != NULL) {
177 FreeHeap(_value);
178 _value = NULL;
179 }
180 }
181
182 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
183 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
184 size_t len = strlen(module_name) + 1;
185 _module_name = AllocateHeap(len, mtInternal);
186 strncpy(_module_name, module_name, len); // copy the trailing null
187 _path = new PathString(path);
188 }
189
190 ModulePatchPath::~ModulePatchPath() {
191 if (_module_name != NULL) {
192 FreeHeap(_module_name);
193 _module_name = NULL;
194 }
195 if (_path != NULL) {
196 delete _path;
197 _path = NULL;
198 }
199 }
200
201 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
202 if (key == NULL) {
203 _key = NULL;
204 } else {
205 _key = AllocateHeap(strlen(key)+1, mtArguments);
206 strcpy(_key, key);
207 }
208 _next = NULL;
209 _internal = internal;
210 _writeable = writeable;
211 }
212
213 AgentLibrary::AgentLibrary(const char* name, const char* options,
214 bool is_absolute_path, void* os_lib,
215 bool instrument_lib) {
216 _name = AllocateHeap(strlen(name)+1, mtArguments);
217 strcpy(_name, name);
218 if (options == NULL) {
219 _options = NULL;
220 } else {
221 _options = AllocateHeap(strlen(options)+1, mtArguments);
222 strcpy(_options, options);
223 }
224 _is_absolute_path = is_absolute_path;
225 _os_lib = os_lib;
226 _next = NULL;
227 _state = agent_invalid;
228 _is_static_lib = false;
229 _is_instrument_lib = instrument_lib;
230 }
231
232 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
233 // part of the option string.
234 static bool match_option(const JavaVMOption *option, const char* name,
235 const char** tail) {
236 size_t len = strlen(name);
237 if (strncmp(option->optionString, name, len) == 0) {
238 *tail = option->optionString + len;
239 return true;
240 } else {
241 return false;
242 }
243 }
244
245 // Check if 'option' matches 'name'. No "tail" is allowed.
246 static bool match_option(const JavaVMOption *option, const char* name) {
247 const char* tail = NULL;
248 bool result = match_option(option, name, &tail);
249 if (tail != NULL && *tail == '\0') {
250 return result;
251 } else {
252 return false;
253 }
254 }
255
256 // Return true if any of the strings in null-terminated array 'names' matches.
257 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
258 // the option must match exactly.
259 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
260 bool tail_allowed) {
261 for (/* empty */; *names != NULL; ++names) {
262 if (match_option(option, *names, tail)) {
263 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
264 return true;
265 }
266 }
267 }
268 return false;
269 }
270
271 #if INCLUDE_JFR
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != NULL, "invariant");
275 char* tail = NULL;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 return Jfr::on_flight_recorder_option(option, tail);
280 }
281 return false;
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 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
330 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
331 }
332
333 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
334 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
335 return ((strncmp(option, property, len) == 0) &&
336 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
337 }
338
339 // Return true if property starts with "jdk.module." and its ensuing chars match
340 // any of the reserved module properties.
341 // property should be passed without the leading "-D".
342 bool Arguments::is_internal_module_property(const char* property) {
343 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
344 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
345 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
346 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
347 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
348 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
349 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
350 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
351 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
352 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
353 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
354 return true;
355 }
356 }
357 return false;
358 }
359
360 // Process java launcher properties.
361 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
362 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
363 // sun.java.launcher.pid is defined.
364 // Must do this before setting up other system properties,
365 // as some of them may depend on launcher type.
366 for (int index = 0; index < args->nOptions; index++) {
367 const JavaVMOption* option = args->options + index;
368 const char* tail;
369
370 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
371 process_java_launcher_argument(tail, option->extraInfo);
372 continue;
373 }
374 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
375 if (strcmp(tail, "true") == 0) {
376 _sun_java_launcher_is_altjvm = true;
377 }
378 continue;
379 }
380 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
381 _sun_java_launcher_pid = atoi(tail);
382 continue;
383 }
384 }
385 }
386
387 // Initialize system properties key and value.
388 void Arguments::init_system_properties() {
389
390 // Set up _system_boot_class_path which is not a property but
391 // relies heavily on argument processing and the jdk.boot.class.path.append
392 // property. It is used to store the underlying system boot class path.
393 _system_boot_class_path = new PathString(NULL);
394
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
396 "Java Virtual Machine Specification", false));
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
399 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
400
401 // Initialize the vm.info now, but it will need updating after argument parsing.
402 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
403
404 // Following are JVMTI agent writable properties.
405 // Properties values are set to NULL and they are
406 // os specific they are initialized in os::init_system_properties_values().
407 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
408 _java_library_path = new SystemProperty("java.library.path", NULL, true);
409 _java_home = new SystemProperty("java.home", NULL, true);
410 _java_class_path = new SystemProperty("java.class.path", "", true);
411 // jdk.boot.class.path.append is a non-writeable, internal property.
412 // It can only be set by either:
413 // - -Xbootclasspath/a:
414 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
415 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
416
417 // Add to System Property list.
418 PropertyList_add(&_system_properties, _sun_boot_library_path);
419 PropertyList_add(&_system_properties, _java_library_path);
420 PropertyList_add(&_system_properties, _java_home);
421 PropertyList_add(&_system_properties, _java_class_path);
422 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
423 PropertyList_add(&_system_properties, _vm_info);
424
425 // Set OS specific system properties values
426 os::init_system_properties_values();
427 }
428
429 // Update/Initialize System properties after JDK version number is known
430 void Arguments::init_version_specific_system_properties() {
431 enum { bufsz = 16 };
432 char buffer[bufsz];
433 const char* spec_vendor = "Oracle Corporation";
434 uint32_t spec_version = JDK_Version::current().major_version();
435
436 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
437
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.version", buffer, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
444 }
445
446 /*
447 * -XX argument processing:
448 *
449 * -XX arguments are defined in several places, such as:
450 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
451 * -XX arguments are parsed in parse_argument().
452 * -XX argument bounds checking is done in check_vm_args_consistency().
453 *
454 * Over time -XX arguments may change. There are mechanisms to handle common cases:
455 *
456 * ALIASED: An option that is simply another name for another option. This is often
457 * part of the process of deprecating a flag, but not all aliases need
458 * to be deprecated.
459 *
460 * Create an alias for an option by adding the old and new option names to the
461 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
462 *
463 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
464 * support may be removed in the future. Both regular and aliased options may be
465 * deprecated.
466 *
467 * Add a deprecation warning for an option (or alias) by adding an entry in the
468 * "special_jvm_flags" table and setting the "deprecated_in" field.
469 * Often an option "deprecated" in one major release will
470 * be made "obsolete" in the next. In this case the entry should also have its
471 * "obsolete_in" field set.
472 *
473 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
474 * on the command line. A warning is printed to let the user know that option might not
475 * be accepted in the future.
476 *
477 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
478 * table and setting the "obsolete_in" field.
479 *
480 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
481 * to the current JDK version. The system will flatly refuse to admit the existence of
482 * the flag. This allows a flag to die automatically over JDK releases.
483 *
484 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
485 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
486 * - Newly obsolete or expired deprecated options should have their global variable
487 * definitions removed (from globals.hpp, etc) and related implementations removed.
488 *
489 * Recommended approach for removing options:
490 *
491 * To remove options commonly used by customers (e.g. product -XX options), use
492 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
493 *
494 * To remove internal options (e.g. diagnostic, experimental, develop options), use
495 * a 2-step model adding major release numbers to the obsolete and expire columns.
496 *
497 * To change the name of an option, use the alias table as well as a 2-step
498 * model adding major release numbers to the deprecate and expire columns.
499 * Think twice about aliasing commonly used customer options.
500 *
501 * There are times when it is appropriate to leave a future release number as undefined.
502 *
503 * Tests: Aliases should be tested in VMAliasOptions.java.
504 * Deprecated options should be tested in VMDeprecatedOptions.java.
505 */
506
507 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
508 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
509 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
510 // the command-line as usual, but will issue a warning.
511 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
512 // the command-line, while issuing a warning and ignoring the flag value.
513 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
514 // existence of the flag.
515 //
516 // MANUAL CLEANUP ON JDK VERSION UPDATES:
517 // This table ensures that the handling of options will update automatically when the JDK
518 // version is incremented, but the source code needs to be cleanup up manually:
519 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
520 // variable should be removed, as well as users of the variable.
521 // - As "deprecated" options age into "obsolete" options, move the entry into the
522 // "Obsolete Flags" section of the table.
523 // - All expired options should be removed from the table.
524 static SpecialFlag const special_jvm_flags[] = {
525 // -------------- Deprecated Flags --------------
526 // --- Non-alias flags - sorted by obsolete_in then expired_in:
527 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
529 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
530 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
537 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
538 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
539 { "PrintSafepointStatisticsTimeout", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
540 { "PrintSafepointStatisticsCount",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
541 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
542 { "AllowNonVirtualCalls", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
543 { "UnlinkSymbolsALot", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
544
545 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
546 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
547 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
548 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
549 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
550
551 // -------------- Obsolete Flags - sorted by expired_in --------------
552 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
553 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
554 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
555 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
556 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
557 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
558 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
559 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
560 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
561 { "TraceScavenge", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
562 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
563 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
564 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
565 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
566 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
567 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
568 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
569 { "UseAppCDS", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
570 { "InlineNotify", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
571 { "EnableTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
572 { "UseLockedTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
573 { "NativeMonitorTimeout", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
574 { "NativeMonitorSpinLimit", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
575 { "NativeMonitorFlags", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
576
577 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
578 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
579 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
580 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
581 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
582 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
583 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
584 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
585 #endif
586
587 { NULL, JDK_Version(0), JDK_Version(0) }
588 };
589
590 // Flags that are aliases for other flags.
591 typedef struct {
592 const char* alias_name;
593 const char* real_name;
594 } AliasedFlag;
595
596 static AliasedFlag const aliased_jvm_flags[] = {
597 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
598 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
599 { NULL, NULL}
600 };
601
602 // NOTE: A compatibility request will be necessary for each alias to be removed.
603 static AliasedLoggingFlag const aliased_logging_flags[] = {
604 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
605 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
606 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
607 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
608 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
609 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
610 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
611 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
612 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
613 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
614 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
615 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
616 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
617 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
618 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
619 };
620
621 #ifndef PRODUCT
622 // These options are removed in jdk9. Remove this code for jdk10.
623 static AliasedFlag const removed_develop_logging_flags[] = {
624 { "TraceClassInitialization", "-Xlog:class+init" },
625 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
626 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
627 { "TraceItables", "-Xlog:itables=debug" },
628 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
629 { "TraceSafepoint", "-Xlog:safepoint=debug" },
630 { "TraceStartupTime", "-Xlog:startuptime" },
631 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
632 { "PrintVtables", "-Xlog:vtables=debug" },
633 { "VerboseVerification", "-Xlog:verification" },
634 { NULL, NULL }
635 };
636 #endif //PRODUCT
637
638 // Return true if "v" is less than "other", where "other" may be "undefined".
639 static bool version_less_than(JDK_Version v, JDK_Version other) {
640 assert(!v.is_undefined(), "must be defined");
641 if (!other.is_undefined() && v.compare(other) >= 0) {
642 return false;
643 } else {
644 return true;
645 }
646 }
647
648 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
649
650 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
651 // Allow extensions to have priority
652 if (lookup_special_flag_ext(flag_name, flag)) {
653 return true;
654 }
655
656 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
657 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
658 flag = special_jvm_flags[i];
659 return true;
660 }
661 }
662 return false;
663 }
664
665 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
666 assert(version != NULL, "Must provide a version buffer");
667 SpecialFlag flag;
668 if (lookup_special_flag(flag_name, flag)) {
669 if (!flag.obsolete_in.is_undefined()) {
670 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
671 *version = flag.obsolete_in;
672 return true;
673 }
674 }
675 }
676 return false;
677 }
678
679 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
680 assert(version != NULL, "Must provide a version buffer");
681 SpecialFlag flag;
682 if (lookup_special_flag(flag_name, flag)) {
683 if (!flag.deprecated_in.is_undefined()) {
684 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
685 version_less_than(JDK_Version::current(), flag.expired_in)) {
686 *version = flag.deprecated_in;
687 return 1;
688 } else {
689 return -1;
690 }
691 }
692 }
693 return 0;
694 }
695
696 #ifndef PRODUCT
697 const char* Arguments::removed_develop_logging_flag_name(const char* name){
698 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
699 const AliasedFlag& flag = removed_develop_logging_flags[i];
700 if (strcmp(flag.alias_name, name) == 0) {
701 return flag.real_name;
702 }
703 }
704 return NULL;
705 }
706 #endif // PRODUCT
707
708 const char* Arguments::real_flag_name(const char *flag_name) {
709 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
710 const AliasedFlag& flag_status = aliased_jvm_flags[i];
711 if (strcmp(flag_status.alias_name, flag_name) == 0) {
712 return flag_status.real_name;
713 }
714 }
715 return flag_name;
716 }
717
718 #ifdef ASSERT
719 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
720 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
721 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
722 return true;
723 }
724 }
725 return false;
726 }
727
728 // Verifies the correctness of the entries in the special_jvm_flags table.
729 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
730 // version being earlier than the deprecation version, then a warning is issued
731 // and verification fails - by returning false. If it is detected that the table
732 // is out of date, with respect to the current version, then a warning is issued
733 // but verification does not fail. This allows the VM to operate when the version
734 // is first updated, without needing to update all the impacted flags at the
735 // same time.
736 static bool verify_special_jvm_flags() {
737 bool success = true;
738 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
739 const SpecialFlag& flag = special_jvm_flags[i];
740 if (lookup_special_flag(flag.name, i)) {
741 warning("Duplicate special flag declaration \"%s\"", flag.name);
742 success = false;
743 }
744 if (flag.deprecated_in.is_undefined() &&
745 flag.obsolete_in.is_undefined()) {
746 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
747 success = false;
748 }
749
750 if (!flag.deprecated_in.is_undefined()) {
751 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
752 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
753 success = false;
754 }
755
756 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
757 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
758 success = false;
759 }
760 }
761
762 if (!flag.obsolete_in.is_undefined()) {
763 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
764 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
765 success = false;
766 }
767
768 // if flag has become obsolete it should not have a "globals" flag defined anymore.
769 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
770 if (JVMFlag::find_flag(flag.name) != NULL) {
771 // Temporarily disable the warning: 8196739
772 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
773 }
774 }
775 }
776
777 if (!flag.expired_in.is_undefined()) {
778 // if flag has become expired it should not have a "globals" flag defined anymore.
779 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
780 if (JVMFlag::find_flag(flag.name) != NULL) {
781 // Temporarily disable the warning: 8196739
782 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
783 }
784 }
785 }
786
787 }
788 return success;
789 }
790 #endif
791
792 // Parses a size specification string.
793 bool Arguments::atojulong(const char *s, julong* result) {
794 julong n = 0;
795
796 // First char must be a digit. Don't allow negative numbers or leading spaces.
797 if (!isdigit(*s)) {
798 return false;
799 }
800
801 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
802 char* remainder;
803 errno = 0;
804 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
805 if (errno != 0) {
806 return false;
807 }
808
809 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
810 if (remainder == s || strlen(remainder) > 1) {
811 return false;
812 }
813
814 switch (*remainder) {
815 case 'T': case 't':
816 *result = n * G * K;
817 // Check for overflow.
818 if (*result/((julong)G * K) != n) return false;
819 return true;
820 case 'G': case 'g':
821 *result = n * G;
822 if (*result/G != n) return false;
823 return true;
824 case 'M': case 'm':
825 *result = n * M;
826 if (*result/M != n) return false;
827 return true;
828 case 'K': case 'k':
829 *result = n * K;
830 if (*result/K != n) return false;
831 return true;
832 case '\0':
833 *result = n;
834 return true;
835 default:
836 return false;
837 }
838 }
839
840 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
841 if (size < min_size) return arg_too_small;
842 if (size > max_size) return arg_too_big;
843 return arg_in_range;
844 }
845
846 // Describe an argument out of range error
847 void Arguments::describe_range_error(ArgsRange errcode) {
848 switch(errcode) {
849 case arg_too_big:
850 jio_fprintf(defaultStream::error_stream(),
851 "The specified size exceeds the maximum "
852 "representable size.\n");
853 break;
854 case arg_too_small:
855 case arg_unreadable:
856 case arg_in_range:
857 // do nothing for now
858 break;
859 default:
860 ShouldNotReachHere();
861 }
862 }
863
864 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
865 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
866 return true;
867 } else {
868 return false;
869 }
870 }
871
872 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
873 char* end;
874 errno = 0;
875 double v = strtod(value, &end);
876 if ((errno != 0) || (*end != 0)) {
877 return false;
878 }
879
880 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
881 return true;
882 }
883 return false;
884 }
885
886 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
887 julong v;
888 int int_v;
889 intx intx_v;
890 bool is_neg = false;
891 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
892
893 if (result == NULL) {
894 return false;
895 }
896
897 // Check the sign first since atojulong() parses only unsigned values.
898 if (*value == '-') {
899 if (!result->is_intx() && !result->is_int()) {
900 return false;
901 }
902 value++;
903 is_neg = true;
904 }
905 if (!Arguments::atojulong(value, &v)) {
906 return false;
907 }
908 if (result->is_int()) {
909 int_v = (int) v;
910 if (is_neg) {
911 int_v = -int_v;
912 }
913 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
914 } else if (result->is_uint()) {
915 uint uint_v = (uint) v;
916 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
917 } else if (result->is_intx()) {
918 intx_v = (intx) v;
919 if (is_neg) {
920 intx_v = -intx_v;
921 }
922 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
923 } else if (result->is_uintx()) {
924 uintx uintx_v = (uintx) v;
925 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
926 } else if (result->is_uint64_t()) {
927 uint64_t uint64_t_v = (uint64_t) v;
928 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
929 } else if (result->is_size_t()) {
930 size_t size_t_v = (size_t) v;
931 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
932 } else if (result->is_double()) {
933 double double_v = (double) v;
934 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
935 } else {
936 return false;
937 }
938 }
939
940 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
941 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
942 // Contract: JVMFlag always returns a pointer that needs freeing.
943 FREE_C_HEAP_ARRAY(char, value);
944 return true;
945 }
946
947 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
948 const char* old_value = "";
949 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
950 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
951 size_t new_len = strlen(new_value);
952 const char* value;
953 char* free_this_too = NULL;
954 if (old_len == 0) {
955 value = new_value;
956 } else if (new_len == 0) {
957 value = old_value;
958 } else {
959 size_t length = old_len + 1 + new_len + 1;
960 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
961 // each new setting adds another LINE to the switch:
962 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
963 value = buf;
964 free_this_too = buf;
965 }
966 (void) JVMFlag::ccstrAtPut(name, &value, origin);
967 // JVMFlag always returns a pointer that needs freeing.
968 FREE_C_HEAP_ARRAY(char, value);
969 if (free_this_too != NULL) {
970 // JVMFlag made its own copy, so I must delete my own temp. buffer.
971 FREE_C_HEAP_ARRAY(char, free_this_too);
972 }
973 return true;
974 }
975
976 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
977 const char* real_name = real_flag_name(arg);
978 JDK_Version since = JDK_Version();
979 switch (is_deprecated_flag(arg, &since)) {
980 case -1:
981 return NULL; // obsolete or expired, don't process normally
982 case 0:
983 return real_name;
984 case 1: {
985 if (warn) {
986 char version[256];
987 since.to_string(version, sizeof(version));
988 if (real_name != arg) {
989 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
990 arg, version, real_name);
991 } else {
992 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
993 arg, version);
994 }
995 }
996 return real_name;
997 }
998 }
999 ShouldNotReachHere();
1000 return NULL;
1001 }
1002
1003 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1004 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1005 // Set tagset string buffer at max size of 256, large enough for any alias tagset
1006 const int max_tagset_size = 256;
1007 int max_tagset_len = max_tagset_size - 1;
1008 char tagset_buffer[max_tagset_size];
1009 tagset_buffer[0] = '\0';
1010
1011 // Write tag-set for aliased logging option, in string list form
1012 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1013 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1014 if (i > 0) {
1015 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1016 }
1017 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1018 }
1019 if (!alf.exactMatch) {
1020 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1021 }
1022 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1023 (on) ? "+" : "-",
1024 name,
1025 tagset_buffer,
1026 (on) ? LogLevel::name(alf.level) : "off");
1027 }
1028
1029 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1030 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1031 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1032 if (strcmp(alf.alias_name, name) == 0) {
1033 log_deprecated_flag(name, on, alf);
1034 return alf;
1035 }
1036 }
1037 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1038 return a;
1039 }
1040
1041 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1042
1043 // range of acceptable characters spelled out for portability reasons
1044 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1045 #define BUFLEN 255
1046 char name[BUFLEN+1];
1047 char dummy;
1048 const char* real_name;
1049 bool warn_if_deprecated = true;
1050
1051 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1052 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1053 if (alf.alias_name != NULL){
1054 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1055 return true;
1056 }
1057 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1058 if (real_name == NULL) {
1059 return false;
1060 }
1061 return set_bool_flag(real_name, false, origin);
1062 }
1063 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1064 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1065 if (alf.alias_name != NULL){
1066 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1067 return true;
1068 }
1069 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1070 if (real_name == NULL) {
1071 return false;
1072 }
1073 return set_bool_flag(real_name, true, origin);
1074 }
1075
1076 char punct;
1077 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1078 const char* value = strchr(arg, '=') + 1;
1079 JVMFlag* flag;
1080
1081 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1082 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1083 if (alf.alias_name != NULL) {
1084 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1085 return true;
1086 }
1087 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1088 if (real_name == NULL) {
1089 return false;
1090 }
1091 flag = JVMFlag::find_flag(real_name);
1092 if (flag != NULL && flag->is_ccstr()) {
1093 if (flag->ccstr_accumulates()) {
1094 return append_to_string_flag(real_name, value, origin);
1095 } else {
1096 if (value[0] == '\0') {
1097 value = NULL;
1098 }
1099 return set_string_flag(real_name, value, origin);
1100 }
1101 } else {
1102 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1103 }
1104 }
1105
1106 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1107 const char* value = strchr(arg, '=') + 1;
1108 // -XX:Foo:=xxx will reset the string flag to the given value.
1109 if (value[0] == '\0') {
1110 value = NULL;
1111 }
1112 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1113 if (real_name == NULL) {
1114 return false;
1115 }
1116 return set_string_flag(real_name, value, origin);
1117 }
1118
1119 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1120 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1121 #define NUMBER_RANGE "[0123456789eE+-]"
1122 char value[BUFLEN + 1];
1123 char value2[BUFLEN + 1];
1124 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1125 // Looks like a floating-point number -- try again with more lenient format string
1126 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1127 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1128 if (real_name == NULL) {
1129 return false;
1130 }
1131 return set_fp_numeric_flag(real_name, value, origin);
1132 }
1133 }
1134
1135 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1136 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1137 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1138 if (real_name == NULL) {
1139 return false;
1140 }
1141 return set_numeric_flag(real_name, value, origin);
1142 }
1143
1144 return false;
1145 }
1146
1147 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1148 assert(bldarray != NULL, "illegal argument");
1149
1150 if (arg == NULL) {
1151 return;
1152 }
1153
1154 int new_count = *count + 1;
1155
1156 // expand the array and add arg to the last element
1157 if (*bldarray == NULL) {
1158 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1159 } else {
1160 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1161 }
1162 (*bldarray)[*count] = os::strdup_check_oom(arg);
1163 *count = new_count;
1164 }
1165
1166 void Arguments::build_jvm_args(const char* arg) {
1167 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1168 }
1169
1170 void Arguments::build_jvm_flags(const char* arg) {
1171 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1172 }
1173
1174 // utility function to return a string that concatenates all
1175 // strings in a given char** array
1176 const char* Arguments::build_resource_string(char** args, int count) {
1177 if (args == NULL || count == 0) {
1178 return NULL;
1179 }
1180 size_t length = 0;
1181 for (int i = 0; i < count; i++) {
1182 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1183 }
1184 char* s = NEW_RESOURCE_ARRAY(char, length);
1185 char* dst = s;
1186 for (int j = 0; j < count; j++) {
1187 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1188 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1189 dst += offset;
1190 length -= offset;
1191 }
1192 return (const char*) s;
1193 }
1194
1195 void Arguments::print_on(outputStream* st) {
1196 st->print_cr("VM Arguments:");
1197 if (num_jvm_flags() > 0) {
1198 st->print("jvm_flags: "); print_jvm_flags_on(st);
1199 st->cr();
1200 }
1201 if (num_jvm_args() > 0) {
1202 st->print("jvm_args: "); print_jvm_args_on(st);
1203 st->cr();
1204 }
1205 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1206 if (_java_class_path != NULL) {
1207 char* path = _java_class_path->value();
1208 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1209 }
1210 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1211 }
1212
1213 void Arguments::print_summary_on(outputStream* st) {
1214 // Print the command line. Environment variables that are helpful for
1215 // reproducing the problem are written later in the hs_err file.
1216 // flags are from setting file
1217 if (num_jvm_flags() > 0) {
1218 st->print_raw("Settings File: ");
1219 print_jvm_flags_on(st);
1220 st->cr();
1221 }
1222 // args are the command line and environment variable arguments.
1223 st->print_raw("Command Line: ");
1224 if (num_jvm_args() > 0) {
1225 print_jvm_args_on(st);
1226 }
1227 // this is the classfile and any arguments to the java program
1228 if (java_command() != NULL) {
1229 st->print("%s", java_command());
1230 }
1231 st->cr();
1232 }
1233
1234 void Arguments::print_jvm_flags_on(outputStream* st) {
1235 if (_num_jvm_flags > 0) {
1236 for (int i=0; i < _num_jvm_flags; i++) {
1237 st->print("%s ", _jvm_flags_array[i]);
1238 }
1239 }
1240 }
1241
1242 void Arguments::print_jvm_args_on(outputStream* st) {
1243 if (_num_jvm_args > 0) {
1244 for (int i=0; i < _num_jvm_args; i++) {
1245 st->print("%s ", _jvm_args_array[i]);
1246 }
1247 }
1248 }
1249
1250 bool Arguments::process_argument(const char* arg,
1251 jboolean ignore_unrecognized,
1252 JVMFlag::Flags origin) {
1253 JDK_Version since = JDK_Version();
1254
1255 if (parse_argument(arg, origin)) {
1256 return true;
1257 }
1258
1259 // Determine if the flag has '+', '-', or '=' characters.
1260 bool has_plus_minus = (*arg == '+' || *arg == '-');
1261 const char* const argname = has_plus_minus ? arg + 1 : arg;
1262
1263 size_t arg_len;
1264 const char* equal_sign = strchr(argname, '=');
1265 if (equal_sign == NULL) {
1266 arg_len = strlen(argname);
1267 } else {
1268 arg_len = equal_sign - argname;
1269 }
1270
1271 // Only make the obsolete check for valid arguments.
1272 if (arg_len <= BUFLEN) {
1273 // Construct a string which consists only of the argument name without '+', '-', or '='.
1274 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1275 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1276 if (is_obsolete_flag(stripped_argname, &since)) {
1277 if (strcmp(stripped_argname, "UseAppCDS") != 0) {
1278 char version[256];
1279 since.to_string(version, sizeof(version));
1280 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1281 } else {
1282 warning("Ignoring obsolete option UseAppCDS; AppCDS is automatically enabled");
1283 }
1284 return true;
1285 }
1286 #ifndef PRODUCT
1287 else {
1288 const char* replacement;
1289 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1290 log_warning(arguments)("%s has been removed. Please use %s instead.",
1291 stripped_argname,
1292 replacement);
1293 return false;
1294 }
1295 }
1296 #endif //PRODUCT
1297 }
1298
1299 // For locked flags, report a custom error message if available.
1300 // Otherwise, report the standard unrecognized VM option.
1301 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1302 if (found_flag != NULL) {
1303 char locked_message_buf[BUFLEN];
1304 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1305 if (strlen(locked_message_buf) == 0) {
1306 if (found_flag->is_bool() && !has_plus_minus) {
1307 jio_fprintf(defaultStream::error_stream(),
1308 "Missing +/- setting for VM option '%s'\n", argname);
1309 } else if (!found_flag->is_bool() && has_plus_minus) {
1310 jio_fprintf(defaultStream::error_stream(),
1311 "Unexpected +/- setting in VM option '%s'\n", argname);
1312 } else {
1313 jio_fprintf(defaultStream::error_stream(),
1314 "Improperly specified VM option '%s'\n", argname);
1315 }
1316 } else {
1317 #ifdef PRODUCT
1318 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1319 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1320 if (ignore_unrecognized && mismatched) {
1321 return true;
1322 }
1323 #endif
1324 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1325 }
1326 } else {
1327 if (ignore_unrecognized) {
1328 return true;
1329 }
1330 jio_fprintf(defaultStream::error_stream(),
1331 "Unrecognized VM option '%s'\n", argname);
1332 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1333 if (fuzzy_matched != NULL) {
1334 jio_fprintf(defaultStream::error_stream(),
1335 "Did you mean '%s%s%s'? ",
1336 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1337 fuzzy_matched->_name,
1338 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1339 }
1340 }
1341
1342 // allow for commandline "commenting out" options like -XX:#+Verbose
1343 return arg[0] == '#';
1344 }
1345
1346 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1347 FILE* stream = fopen(file_name, "rb");
1348 if (stream == NULL) {
1349 if (should_exist) {
1350 jio_fprintf(defaultStream::error_stream(),
1351 "Could not open settings file %s\n", file_name);
1352 return false;
1353 } else {
1354 return true;
1355 }
1356 }
1357
1358 char token[1024];
1359 int pos = 0;
1360
1361 bool in_white_space = true;
1362 bool in_comment = false;
1363 bool in_quote = false;
1364 char quote_c = 0;
1365 bool result = true;
1366
1367 int c = getc(stream);
1368 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1369 if (in_white_space) {
1370 if (in_comment) {
1371 if (c == '\n') in_comment = false;
1372 } else {
1373 if (c == '#') in_comment = true;
1374 else if (!isspace(c)) {
1375 in_white_space = false;
1376 token[pos++] = c;
1377 }
1378 }
1379 } else {
1380 if (c == '\n' || (!in_quote && isspace(c))) {
1381 // token ends at newline, or at unquoted whitespace
1382 // this allows a way to include spaces in string-valued options
1383 token[pos] = '\0';
1384 logOption(token);
1385 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1386 build_jvm_flags(token);
1387 pos = 0;
1388 in_white_space = true;
1389 in_quote = false;
1390 } else if (!in_quote && (c == '\'' || c == '"')) {
1391 in_quote = true;
1392 quote_c = c;
1393 } else if (in_quote && (c == quote_c)) {
1394 in_quote = false;
1395 } else {
1396 token[pos++] = c;
1397 }
1398 }
1399 c = getc(stream);
1400 }
1401 if (pos > 0) {
1402 token[pos] = '\0';
1403 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1404 build_jvm_flags(token);
1405 }
1406 fclose(stream);
1407 return result;
1408 }
1409
1410 //=============================================================================================================
1411 // Parsing of properties (-D)
1412
1413 const char* Arguments::get_property(const char* key) {
1414 return PropertyList_get_value(system_properties(), key);
1415 }
1416
1417 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1418 const char* eq = strchr(prop, '=');
1419 const char* key;
1420 const char* value = "";
1421
1422 if (eq == NULL) {
1423 // property doesn't have a value, thus use passed string
1424 key = prop;
1425 } else {
1426 // property have a value, thus extract it and save to the
1427 // allocated string
1428 size_t key_len = eq - prop;
1429 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1430
1431 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1432 key = tmp_key;
1433
1434 value = &prop[key_len + 1];
1435 }
1436
1437 if (strcmp(key, "java.compiler") == 0) {
1438 process_java_compiler_argument(value);
1439 // Record value in Arguments, but let it get passed to Java.
1440 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1441 strcmp(key, "sun.java.launcher.pid") == 0) {
1442 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1443 // private and are processed in process_sun_java_launcher_properties();
1444 // the sun.java.launcher property is passed on to the java application
1445 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1446 // append is true, writable is true, internal is false
1447 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1448 WriteableProperty, ExternalProperty);
1449 } else {
1450 if (strcmp(key, "sun.java.command") == 0) {
1451 char *old_java_command = _java_command;
1452 _java_command = os::strdup_check_oom(value, mtArguments);
1453 if (old_java_command != NULL) {
1454 os::free(old_java_command);
1455 }
1456 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1457 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1458 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1459 // its value without going through the property list or making a Java call.
1460 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1461 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1462 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1463 os::free((void *)old_java_vendor_url_bug);
1464 }
1465 }
1466
1467 // Create new property and add at the end of the list
1468 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1469 }
1470
1471 if (key != prop) {
1472 // SystemProperty copy passed value, thus free previously allocated
1473 // memory
1474 FreeHeap((void *)key);
1475 }
1476
1477 return true;
1478 }
1479
1480 #if INCLUDE_CDS
1481 const char* unsupported_properties[] = { "jdk.module.limitmods",
1482 "jdk.module.upgrade.path",
1483 "jdk.module.patch.0" };
1484 const char* unsupported_options[] = { "--limit-modules",
1485 "--upgrade-module-path",
1486 "--patch-module"
1487 };
1488 void Arguments::check_unsupported_dumping_properties() {
1489 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1490 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1491 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1492 SystemProperty* sp = system_properties();
1493 while (sp != NULL) {
1494 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1495 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1496 vm_exit_during_initialization(
1497 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1498 }
1499 }
1500 sp = sp->next();
1501 }
1502
1503 // Check for an exploded module build in use with -Xshare:dump.
1504 if (!has_jimage()) {
1505 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1506 }
1507 }
1508
1509 bool Arguments::check_unsupported_cds_runtime_properties() {
1510 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1511 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1512 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1513 if (get_property(unsupported_properties[i]) != NULL) {
1514 if (RequireSharedSpaces) {
1515 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1516 }
1517 return true;
1518 }
1519 }
1520 return false;
1521 }
1522 #endif
1523
1524 //===========================================================================================================
1525 // Setting int/mixed/comp mode flags
1526
1527 void Arguments::set_mode_flags(Mode mode) {
1528 // Set up default values for all flags.
1529 // If you add a flag to any of the branches below,
1530 // add a default value for it here.
1531 set_java_compiler(false);
1532 _mode = mode;
1533
1534 // Ensure Agent_OnLoad has the correct initial values.
1535 // This may not be the final mode; mode may change later in onload phase.
1536 PropertyList_unique_add(&_system_properties, "java.vm.info",
1537 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1538
1539 UseInterpreter = true;
1540 UseCompiler = true;
1541 UseLoopCounter = true;
1542
1543 // Default values may be platform/compiler dependent -
1544 // use the saved values
1545 ClipInlining = Arguments::_ClipInlining;
1546 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1547 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1548 BackgroundCompilation = Arguments::_BackgroundCompilation;
1549 if (TieredCompilation) {
1550 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1551 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1552 }
1553 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1554 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1555 }
1556 }
1557
1558 // Change from defaults based on mode
1559 switch (mode) {
1560 default:
1561 ShouldNotReachHere();
1562 break;
1563 case _int:
1564 UseCompiler = false;
1565 UseLoopCounter = false;
1566 AlwaysCompileLoopMethods = false;
1567 UseOnStackReplacement = false;
1568 break;
1569 case _mixed:
1570 // same as default
1571 break;
1572 case _comp:
1573 UseInterpreter = false;
1574 BackgroundCompilation = false;
1575 ClipInlining = false;
1576 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1577 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1578 // compile a level 4 (C2) and then continue executing it.
1579 if (TieredCompilation) {
1580 Tier3InvokeNotifyFreqLog = 0;
1581 Tier4InvocationThreshold = 0;
1582 }
1583 break;
1584 }
1585 }
1586
1587 // Conflict: required to use shared spaces (-Xshare:on), but
1588 // incompatible command line options were chosen.
1589 static void no_shared_spaces(const char* message) {
1590 if (RequireSharedSpaces) {
1591 jio_fprintf(defaultStream::error_stream(),
1592 "Class data sharing is inconsistent with other specified options.\n");
1593 vm_exit_during_initialization("Unable to use shared archive", message);
1594 } else {
1595 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1596 }
1597 }
1598
1599 void set_object_alignment() {
1600 // Object alignment.
1601 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1602 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1603 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1604 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1605 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1606 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1607
1608 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1609 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1610
1611 // Oop encoding heap max
1612 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1613
1614 if (SurvivorAlignmentInBytes == 0) {
1615 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1616 }
1617 }
1618
1619 size_t Arguments::max_heap_for_compressed_oops() {
1620 // Avoid sign flip.
1621 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1622 // We need to fit both the NULL page and the heap into the memory budget, while
1623 // keeping alignment constraints of the heap. To guarantee the latter, as the
1624 // NULL page is located before the heap, we pad the NULL page to the conservative
1625 // maximum alignment that the GC may ever impose upon the heap.
1626 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1627 _conservative_max_heap_alignment);
1628
1629 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1630 NOT_LP64(ShouldNotReachHere(); return 0);
1631 }
1632
1633 void Arguments::set_use_compressed_oops() {
1634 #ifndef ZERO
1635 #ifdef _LP64
1636 // MaxHeapSize is not set up properly at this point, but
1637 // the only value that can override MaxHeapSize if we are
1638 // to use UseCompressedOops is InitialHeapSize.
1639 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1640
1641 if (max_heap_size <= max_heap_for_compressed_oops()) {
1642 #if !defined(COMPILER1) || defined(TIERED)
1643 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1644 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1645 }
1646 #endif
1647 } else {
1648 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1649 warning("Max heap size too large for Compressed Oops");
1650 FLAG_SET_DEFAULT(UseCompressedOops, false);
1651 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1652 }
1653 }
1654 #endif // _LP64
1655 #endif // ZERO
1656 }
1657
1658
1659 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1660 // set_use_compressed_oops().
1661 void Arguments::set_use_compressed_klass_ptrs() {
1662 #ifndef ZERO
1663 #ifdef _LP64
1664 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1665 if (!UseCompressedOops) {
1666 if (UseCompressedClassPointers) {
1667 warning("UseCompressedClassPointers requires UseCompressedOops");
1668 }
1669 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1670 } else {
1671 // Turn on UseCompressedClassPointers too
1672 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1673 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1674 }
1675 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1676 if (UseCompressedClassPointers) {
1677 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1678 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1679 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1680 }
1681 }
1682 }
1683 #endif // _LP64
1684 #endif // !ZERO
1685 }
1686
1687 void Arguments::set_conservative_max_heap_alignment() {
1688 // The conservative maximum required alignment for the heap is the maximum of
1689 // the alignments imposed by several sources: any requirements from the heap
1690 // itself, the collector policy and the maximum page size we may run the VM
1691 // with.
1692 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1693 _conservative_max_heap_alignment = MAX4(heap_alignment,
1694 (size_t)os::vm_allocation_granularity(),
1695 os::max_page_size(),
1696 CollectorPolicy::compute_heap_alignment());
1697 }
1698
1699 jint Arguments::set_ergonomics_flags() {
1700 GCConfig::initialize();
1701
1702 set_conservative_max_heap_alignment();
1703
1704 #ifndef ZERO
1705 #ifdef _LP64
1706 set_use_compressed_oops();
1707
1708 // set_use_compressed_klass_ptrs() must be called after calling
1709 // set_use_compressed_oops().
1710 set_use_compressed_klass_ptrs();
1711
1712 // Also checks that certain machines are slower with compressed oops
1713 // in vm_version initialization code.
1714 #endif // _LP64
1715 #endif // !ZERO
1716
1717 return JNI_OK;
1718 }
1719
1720 julong Arguments::limit_by_allocatable_memory(julong limit) {
1721 julong max_allocatable;
1722 julong result = limit;
1723 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1724 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1725 }
1726 return result;
1727 }
1728
1729 // Use static initialization to get the default before parsing
1730 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1731
1732 void Arguments::set_heap_size() {
1733 julong phys_mem =
1734 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1735 : (julong)MaxRAM;
1736
1737 // Convert deprecated flags
1738 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1739 !FLAG_IS_DEFAULT(MaxRAMFraction))
1740 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1741
1742 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1743 !FLAG_IS_DEFAULT(MinRAMFraction))
1744 MinRAMPercentage = 100.0 / MinRAMFraction;
1745
1746 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1747 !FLAG_IS_DEFAULT(InitialRAMFraction))
1748 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1749
1750 // If the maximum heap size has not been set with -Xmx,
1751 // then set it as fraction of the size of physical memory,
1752 // respecting the maximum and minimum sizes of the heap.
1753 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1754 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1755 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1756 if (reasonable_min < MaxHeapSize) {
1757 // Small physical memory, so use a minimum fraction of it for the heap
1758 reasonable_max = reasonable_min;
1759 } else {
1760 // Not-small physical memory, so require a heap at least
1761 // as large as MaxHeapSize
1762 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1763 }
1764
1765 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1766 // Limit the heap size to ErgoHeapSizeLimit
1767 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1768 }
1769 if (UseCompressedOops) {
1770 // Limit the heap size to the maximum possible when using compressed oops
1771 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1772
1773 // HeapBaseMinAddress can be greater than default but not less than.
1774 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1775 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1776 // matches compressed oops printing flags
1777 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1778 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1779 DefaultHeapBaseMinAddress,
1780 DefaultHeapBaseMinAddress/G,
1781 HeapBaseMinAddress);
1782 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1783 }
1784 }
1785
1786 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1787 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1788 // but it should be not less than default MaxHeapSize.
1789 max_coop_heap -= HeapBaseMinAddress;
1790 }
1791 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1792 }
1793 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1794
1795 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1796 // An initial heap size was specified on the command line,
1797 // so be sure that the maximum size is consistent. Done
1798 // after call to limit_by_allocatable_memory because that
1799 // method might reduce the allocation size.
1800 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1801 }
1802
1803 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1804 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1805 }
1806
1807 // If the minimum or initial heap_size have not been set or requested to be set
1808 // ergonomically, set them accordingly.
1809 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1810 julong reasonable_minimum = (julong)(OldSize + NewSize);
1811
1812 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1813
1814 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1815
1816 if (InitialHeapSize == 0) {
1817 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1818
1819 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1820 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1821
1822 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1823
1824 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1825 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1826 }
1827 // If the minimum heap size has not been set (via -Xms),
1828 // synchronize with InitialHeapSize to avoid errors with the default value.
1829 if (min_heap_size() == 0) {
1830 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1831 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1832 }
1833 }
1834 }
1835
1836 // This option inspects the machine and attempts to set various
1837 // parameters to be optimal for long-running, memory allocation
1838 // intensive jobs. It is intended for machines with large
1839 // amounts of cpu and memory.
1840 jint Arguments::set_aggressive_heap_flags() {
1841 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1842 // VM, but we may not be able to represent the total physical memory
1843 // available (like having 8gb of memory on a box but using a 32bit VM).
1844 // Thus, we need to make sure we're using a julong for intermediate
1845 // calculations.
1846 julong initHeapSize;
1847 julong total_memory = os::physical_memory();
1848
1849 if (total_memory < (julong) 256 * M) {
1850 jio_fprintf(defaultStream::error_stream(),
1851 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1852 vm_exit(1);
1853 }
1854
1855 // The heap size is half of available memory, or (at most)
1856 // all of possible memory less 160mb (leaving room for the OS
1857 // when using ISM). This is the maximum; because adaptive sizing
1858 // is turned on below, the actual space used may be smaller.
1859
1860 initHeapSize = MIN2(total_memory / (julong) 2,
1861 total_memory - (julong) 160 * M);
1862
1863 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1864
1865 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1866 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1867 return JNI_EINVAL;
1868 }
1869 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1870 return JNI_EINVAL;
1871 }
1872 // Currently the minimum size and the initial heap sizes are the same.
1873 set_min_heap_size(initHeapSize);
1874 }
1875 if (FLAG_IS_DEFAULT(NewSize)) {
1876 // Make the young generation 3/8ths of the total heap.
1877 if (FLAG_SET_CMDLINE(size_t, NewSize,
1878 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1879 return JNI_EINVAL;
1880 }
1881 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1882 return JNI_EINVAL;
1883 }
1884 }
1885
1886 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1887 FLAG_SET_DEFAULT(UseLargePages, true);
1888 #endif
1889
1890 // Increase some data structure sizes for efficiency
1891 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1892 return JNI_EINVAL;
1893 }
1894 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) {
1895 return JNI_EINVAL;
1896 }
1897 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1898 return JNI_EINVAL;
1899 }
1900
1901 // See the OldPLABSize comment below, but replace 'after promotion'
1902 // with 'after copying'. YoungPLABSize is the size of the survivor
1903 // space per-gc-thread buffers. The default is 4kw.
1904 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1905 return JNI_EINVAL;
1906 }
1907
1908 // OldPLABSize is the size of the buffers in the old gen that
1909 // UseParallelGC uses to promote live data that doesn't fit in the
1910 // survivor spaces. At any given time, there's one for each gc thread.
1911 // The default size is 1kw. These buffers are rarely used, since the
1912 // survivor spaces are usually big enough. For specjbb, however, there
1913 // are occasions when there's lots of live data in the young gen
1914 // and we end up promoting some of it. We don't have a definite
1915 // explanation for why bumping OldPLABSize helps, but the theory
1916 // is that a bigger PLAB results in retaining something like the
1917 // original allocation order after promotion, which improves mutator
1918 // locality. A minor effect may be that larger PLABs reduce the
1919 // number of PLAB allocation events during gc. The value of 8kw
1920 // was arrived at by experimenting with specjbb.
1921 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1922 return JNI_EINVAL;
1923 }
1924
1925 // Enable parallel GC and adaptive generation sizing
1926 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) {
1927 return JNI_EINVAL;
1928 }
1929
1930 // Encourage steady state memory management
1931 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1932 return JNI_EINVAL;
1933 }
1934
1935 // This appears to improve mutator locality
1936 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1937 return JNI_EINVAL;
1938 }
1939
1940 // Get around early Solaris scheduling bug
1941 // (affinity vs other jobs on system)
1942 // but disallow DR and offlining (5008695).
1943 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1944 return JNI_EINVAL;
1945 }
1946
1947 return JNI_OK;
1948 }
1949
1950 // This must be called after ergonomics.
1951 void Arguments::set_bytecode_flags() {
1952 if (!RewriteBytecodes) {
1953 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1954 }
1955 }
1956
1957 // Aggressive optimization flags -XX:+AggressiveOpts
1958 jint Arguments::set_aggressive_opts_flags() {
1959 #ifdef COMPILER2
1960 if (AggressiveUnboxing) {
1961 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1962 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1963 } else if (!EliminateAutoBox) {
1964 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1965 AggressiveUnboxing = false;
1966 }
1967 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1968 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1969 } else if (!DoEscapeAnalysis) {
1970 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1971 AggressiveUnboxing = false;
1972 }
1973 }
1974 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1975 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1976 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1977 }
1978 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1979 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1980 }
1981
1982 // Feed the cache size setting into the JDK
1983 char buffer[1024];
1984 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1985 if (!add_property(buffer)) {
1986 return JNI_ENOMEM;
1987 }
1988 }
1989 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1990 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1991 }
1992 #endif
1993
1994 if (AggressiveOpts) {
1995 // Sample flag setting code
1996 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1997 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1998 // }
1999 }
2000
2001 return JNI_OK;
2002 }
2003
2004 //===========================================================================================================
2005 // Parsing of java.compiler property
2006
2007 void Arguments::process_java_compiler_argument(const char* arg) {
2008 // For backwards compatibility, Djava.compiler=NONE or ""
2009 // causes us to switch to -Xint mode UNLESS -Xdebug
2010 // is also specified.
2011 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2012 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2013 }
2014 }
2015
2016 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2017 _sun_java_launcher = os::strdup_check_oom(launcher);
2018 }
2019
2020 bool Arguments::created_by_java_launcher() {
2021 assert(_sun_java_launcher != NULL, "property must have value");
2022 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2023 }
2024
2025 bool Arguments::sun_java_launcher_is_altjvm() {
2026 return _sun_java_launcher_is_altjvm;
2027 }
2028
2029 //===========================================================================================================
2030 // Parsing of main arguments
2031
2032 unsigned int addreads_count = 0;
2033 unsigned int addexports_count = 0;
2034 unsigned int addopens_count = 0;
2035 unsigned int addmods_count = 0;
2036 unsigned int patch_mod_count = 0;
2037
2038 // Check the consistency of vm_init_args
2039 bool Arguments::check_vm_args_consistency() {
2040 // Method for adding checks for flag consistency.
2041 // The intent is to warn the user of all possible conflicts,
2042 // before returning an error.
2043 // Note: Needs platform-dependent factoring.
2044 bool status = true;
2045
2046 if (TLABRefillWasteFraction == 0) {
2047 jio_fprintf(defaultStream::error_stream(),
2048 "TLABRefillWasteFraction should be a denominator, "
2049 "not " SIZE_FORMAT "\n",
2050 TLABRefillWasteFraction);
2051 status = false;
2052 }
2053
2054 if (PrintNMTStatistics) {
2055 #if INCLUDE_NMT
2056 if (MemTracker::tracking_level() == NMT_off) {
2057 #endif // INCLUDE_NMT
2058 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2059 PrintNMTStatistics = false;
2060 #if INCLUDE_NMT
2061 }
2062 #endif
2063 }
2064
2065 status = CompilerConfig::check_args_consistency(status);
2066 #if INCLUDE_JVMCI
2067 if (status && EnableJVMCI) {
2068 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2069 AddProperty, UnwriteableProperty, InternalProperty);
2070 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2071 return false;
2072 }
2073 }
2074 #endif
2075
2076 #ifndef SUPPORT_RESERVED_STACK_AREA
2077 if (StackReservedPages != 0) {
2078 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2079 warning("Reserved Stack Area not supported on this platform");
2080 }
2081 #endif
2082
2083 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2084 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2085 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2086 }
2087 }
2088 return status;
2089 }
2090
2091 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2092 const char* option_type) {
2093 if (ignore) return false;
2094
2095 const char* spacer = " ";
2096 if (option_type == NULL) {
2097 option_type = ++spacer; // Set both to the empty string.
2098 }
2099
2100 if (os::obsolete_option(option)) {
2101 jio_fprintf(defaultStream::error_stream(),
2102 "Obsolete %s%soption: %s\n", option_type, spacer,
2103 option->optionString);
2104 return false;
2105 } else {
2106 jio_fprintf(defaultStream::error_stream(),
2107 "Unrecognized %s%soption: %s\n", option_type, spacer,
2108 option->optionString);
2109 return true;
2110 }
2111 }
2112
2113 static const char* user_assertion_options[] = {
2114 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2115 };
2116
2117 static const char* system_assertion_options[] = {
2118 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2119 };
2120
2121 bool Arguments::parse_uintx(const char* value,
2122 uintx* uintx_arg,
2123 uintx min_size) {
2124
2125 // Check the sign first since atojulong() parses only unsigned values.
2126 bool value_is_positive = !(*value == '-');
2127
2128 if (value_is_positive) {
2129 julong n;
2130 bool good_return = atojulong(value, &n);
2131 if (good_return) {
2132 bool above_minimum = n >= min_size;
2133 bool value_is_too_large = n > max_uintx;
2134
2135 if (above_minimum && !value_is_too_large) {
2136 *uintx_arg = n;
2137 return true;
2138 }
2139 }
2140 }
2141 return false;
2142 }
2143
2144 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2145 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2146 char* property = AllocateHeap(prop_len, mtArguments);
2147 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2148 if (ret < 0 || ret >= (int)prop_len) {
2149 FreeHeap(property);
2150 return false;
2151 }
2152 bool added = add_property(property, UnwriteableProperty, internal);
2153 FreeHeap(property);
2154 return added;
2155 }
2156
2157 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2158 const unsigned int props_count_limit = 1000;
2159 const int max_digits = 3;
2160 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2161
2162 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2163 if (count < props_count_limit) {
2164 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2165 char* property = AllocateHeap(prop_len, mtArguments);
2166 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2167 if (ret < 0 || ret >= (int)prop_len) {
2168 FreeHeap(property);
2169 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2170 return false;
2171 }
2172 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2173 FreeHeap(property);
2174 return added;
2175 }
2176
2177 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2178 return false;
2179 }
2180
2181 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2182 julong* long_arg,
2183 julong min_size,
2184 julong max_size) {
2185 if (!atojulong(s, long_arg)) return arg_unreadable;
2186 return check_memory_size(*long_arg, min_size, max_size);
2187 }
2188
2189 // Parse JavaVMInitArgs structure
2190
2191 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2192 const JavaVMInitArgs *java_options_args,
2193 const JavaVMInitArgs *cmd_line_args) {
2194 bool patch_mod_javabase = false;
2195
2196 // Save default settings for some mode flags
2197 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2198 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2199 Arguments::_ClipInlining = ClipInlining;
2200 Arguments::_BackgroundCompilation = BackgroundCompilation;
2201 if (TieredCompilation) {
2202 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2203 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2204 }
2205
2206 // Setup flags for mixed which is the default
2207 set_mode_flags(_mixed);
2208
2209 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2210 // variable (if present).
2211 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2212 if (result != JNI_OK) {
2213 return result;
2214 }
2215
2216 // Parse args structure generated from the command line flags.
2217 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2218 if (result != JNI_OK) {
2219 return result;
2220 }
2221
2222 // Parse args structure generated from the _JAVA_OPTIONS environment
2223 // variable (if present) (mimics classic VM)
2224 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2225 if (result != JNI_OK) {
2226 return result;
2227 }
2228
2229 // We need to ensure processor and memory resources have been properly
2230 // configured - which may rely on arguments we just processed - before
2231 // doing the final argument processing. Any argument processing that
2232 // needs to know about processor and memory resources must occur after
2233 // this point.
2234
2235 os::init_container_support();
2236
2237 // Do final processing now that all arguments have been parsed
2238 result = finalize_vm_init_args(patch_mod_javabase);
2239 if (result != JNI_OK) {
2240 return result;
2241 }
2242
2243 return JNI_OK;
2244 }
2245
2246 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2247 // represents a valid JDWP agent. is_path==true denotes that we
2248 // are dealing with -agentpath (case where name is a path), otherwise with
2249 // -agentlib
2250 bool valid_jdwp_agent(char *name, bool is_path) {
2251 char *_name;
2252 const char *_jdwp = "jdwp";
2253 size_t _len_jdwp, _len_prefix;
2254
2255 if (is_path) {
2256 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2257 return false;
2258 }
2259
2260 _name++; // skip past last path separator
2261 _len_prefix = strlen(JNI_LIB_PREFIX);
2262
2263 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2264 return false;
2265 }
2266
2267 _name += _len_prefix;
2268 _len_jdwp = strlen(_jdwp);
2269
2270 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2271 _name += _len_jdwp;
2272 }
2273 else {
2274 return false;
2275 }
2276
2277 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2278 return false;
2279 }
2280
2281 return true;
2282 }
2283
2284 if (strcmp(name, _jdwp) == 0) {
2285 return true;
2286 }
2287
2288 return false;
2289 }
2290
2291 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2292 // --patch-module=<module>=<file>(<pathsep><file>)*
2293 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2294 // Find the equal sign between the module name and the path specification
2295 const char* module_equal = strchr(patch_mod_tail, '=');
2296 if (module_equal == NULL) {
2297 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2298 return JNI_ERR;
2299 } else {
2300 // Pick out the module name
2301 size_t module_len = module_equal - patch_mod_tail;
2302 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2303 if (module_name != NULL) {
2304 memcpy(module_name, patch_mod_tail, module_len);
2305 *(module_name + module_len) = '\0';
2306 // The path piece begins one past the module_equal sign
2307 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2308 FREE_C_HEAP_ARRAY(char, module_name);
2309 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2310 return JNI_ENOMEM;
2311 }
2312 } else {
2313 return JNI_ENOMEM;
2314 }
2315 }
2316 return JNI_OK;
2317 }
2318
2319 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2320 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2321 // The min and max sizes match the values in globals.hpp, but scaled
2322 // with K. The values have been chosen so that alignment with page
2323 // size doesn't change the max value, which makes the conversions
2324 // back and forth between Xss value and ThreadStackSize value easier.
2325 // The values have also been chosen to fit inside a 32-bit signed type.
2326 const julong min_ThreadStackSize = 0;
2327 const julong max_ThreadStackSize = 1 * M;
2328
2329 const julong min_size = min_ThreadStackSize * K;
2330 const julong max_size = max_ThreadStackSize * K;
2331
2332 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2333
2334 julong size = 0;
2335 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2336 if (errcode != arg_in_range) {
2337 bool silent = (option == NULL); // Allow testing to silence error messages
2338 if (!silent) {
2339 jio_fprintf(defaultStream::error_stream(),
2340 "Invalid thread stack size: %s\n", option->optionString);
2341 describe_range_error(errcode);
2342 }
2343 return JNI_EINVAL;
2344 }
2345
2346 // Internally track ThreadStackSize in units of 1024 bytes.
2347 const julong size_aligned = align_up(size, K);
2348 assert(size <= size_aligned,
2349 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2350 size, size_aligned);
2351
2352 const julong size_in_K = size_aligned / K;
2353 assert(size_in_K < (julong)max_intx,
2354 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2355 size_in_K);
2356
2357 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2358 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2359 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2360 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2361 max_expanded, size_in_K);
2362
2363 *out_ThreadStackSize = (intx)size_in_K;
2364
2365 return JNI_OK;
2366 }
2367
2368 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2369 // For match_option to return remaining or value part of option string
2370 const char* tail;
2371
2372 // iterate over arguments
2373 for (int index = 0; index < args->nOptions; index++) {
2374 bool is_absolute_path = false; // for -agentpath vs -agentlib
2375
2376 const JavaVMOption* option = args->options + index;
2377
2378 if (!match_option(option, "-Djava.class.path", &tail) &&
2379 !match_option(option, "-Dsun.java.command", &tail) &&
2380 !match_option(option, "-Dsun.java.launcher", &tail)) {
2381
2382 // add all jvm options to the jvm_args string. This string
2383 // is used later to set the java.vm.args PerfData string constant.
2384 // the -Djava.class.path and the -Dsun.java.command options are
2385 // omitted from jvm_args string as each have their own PerfData
2386 // string constant object.
2387 build_jvm_args(option->optionString);
2388 }
2389
2390 // -verbose:[class/module/gc/jni]
2391 if (match_option(option, "-verbose", &tail)) {
2392 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2393 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2394 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2395 } else if (!strcmp(tail, ":module")) {
2396 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2397 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2398 } else if (!strcmp(tail, ":gc")) {
2399 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2400 } else if (!strcmp(tail, ":jni")) {
2401 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2402 return JNI_EINVAL;
2403 }
2404 }
2405 // -da / -ea / -disableassertions / -enableassertions
2406 // These accept an optional class/package name separated by a colon, e.g.,
2407 // -da:java.lang.Thread.
2408 } else if (match_option(option, user_assertion_options, &tail, true)) {
2409 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2410 if (*tail == '\0') {
2411 JavaAssertions::setUserClassDefault(enable);
2412 } else {
2413 assert(*tail == ':', "bogus match by match_option()");
2414 JavaAssertions::addOption(tail + 1, enable);
2415 }
2416 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2417 } else if (match_option(option, system_assertion_options, &tail, false)) {
2418 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2419 JavaAssertions::setSystemClassDefault(enable);
2420 // -bootclasspath:
2421 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2422 jio_fprintf(defaultStream::output_stream(),
2423 "-Xbootclasspath is no longer a supported option.\n");
2424 return JNI_EINVAL;
2425 // -bootclasspath/a:
2426 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2427 Arguments::append_sysclasspath(tail);
2428 // -bootclasspath/p:
2429 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2430 jio_fprintf(defaultStream::output_stream(),
2431 "-Xbootclasspath/p is no longer a supported option.\n");
2432 return JNI_EINVAL;
2433 // -Xrun
2434 } else if (match_option(option, "-Xrun", &tail)) {
2435 if (tail != NULL) {
2436 const char* pos = strchr(tail, ':');
2437 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2438 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2439 jio_snprintf(name, len + 1, "%s", tail);
2440
2441 char *options = NULL;
2442 if(pos != NULL) {
2443 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2444 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2445 }
2446 #if !INCLUDE_JVMTI
2447 if (strcmp(name, "jdwp") == 0) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Debugging agents are not supported in this VM\n");
2450 return JNI_ERR;
2451 }
2452 #endif // !INCLUDE_JVMTI
2453 add_init_library(name, options);
2454 }
2455 } else if (match_option(option, "--add-reads=", &tail)) {
2456 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2457 return JNI_ENOMEM;
2458 }
2459 } else if (match_option(option, "--add-exports=", &tail)) {
2460 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2461 return JNI_ENOMEM;
2462 }
2463 } else if (match_option(option, "--add-opens=", &tail)) {
2464 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2465 return JNI_ENOMEM;
2466 }
2467 } else if (match_option(option, "--add-modules=", &tail)) {
2468 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2469 return JNI_ENOMEM;
2470 }
2471 } else if (match_option(option, "--limit-modules=", &tail)) {
2472 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2473 return JNI_ENOMEM;
2474 }
2475 } else if (match_option(option, "--module-path=", &tail)) {
2476 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2477 return JNI_ENOMEM;
2478 }
2479 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2480 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2481 return JNI_ENOMEM;
2482 }
2483 } else if (match_option(option, "--patch-module=", &tail)) {
2484 // --patch-module=<module>=<file>(<pathsep><file>)*
2485 int res = process_patch_mod_option(tail, patch_mod_javabase);
2486 if (res != JNI_OK) {
2487 return res;
2488 }
2489 } else if (match_option(option, "--illegal-access=", &tail)) {
2490 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2491 return JNI_ENOMEM;
2492 }
2493 // -agentlib and -agentpath
2494 } else if (match_option(option, "-agentlib:", &tail) ||
2495 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2496 if(tail != NULL) {
2497 const char* pos = strchr(tail, '=');
2498 char* name;
2499 if (pos == NULL) {
2500 name = os::strdup_check_oom(tail, mtArguments);
2501 } else {
2502 size_t len = pos - tail;
2503 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2504 memcpy(name, tail, len);
2505 name[len] = '\0';
2506 }
2507
2508 char *options = NULL;
2509 if(pos != NULL) {
2510 options = os::strdup_check_oom(pos + 1, mtArguments);
2511 }
2512 #if !INCLUDE_JVMTI
2513 if (valid_jdwp_agent(name, is_absolute_path)) {
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Debugging agents are not supported in this VM\n");
2516 return JNI_ERR;
2517 }
2518 #endif // !INCLUDE_JVMTI
2519 add_init_agent(name, options, is_absolute_path);
2520 }
2521 // -javaagent
2522 } else if (match_option(option, "-javaagent:", &tail)) {
2523 #if !INCLUDE_JVMTI
2524 jio_fprintf(defaultStream::error_stream(),
2525 "Instrumentation agents are not supported in this VM\n");
2526 return JNI_ERR;
2527 #else
2528 if (tail != NULL) {
2529 size_t length = strlen(tail) + 1;
2530 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2531 jio_snprintf(options, length, "%s", tail);
2532 add_instrument_agent("instrument", options, false);
2533 // java agents need module java.instrument
2534 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2535 return JNI_ENOMEM;
2536 }
2537 }
2538 #endif // !INCLUDE_JVMTI
2539 // --enable_preview
2540 } else if (match_option(option, "--enable-preview")) {
2541 set_enable_preview();
2542 // -Xnoclassgc
2543 } else if (match_option(option, "-Xnoclassgc")) {
2544 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) {
2545 return JNI_EINVAL;
2546 }
2547 // -Xconcgc
2548 } else if (match_option(option, "-Xconcgc")) {
2549 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2550 return JNI_EINVAL;
2551 }
2552 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2553 // -Xnoconcgc
2554 } else if (match_option(option, "-Xnoconcgc")) {
2555 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2556 return JNI_EINVAL;
2557 }
2558 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2559 // -Xbatch
2560 } else if (match_option(option, "-Xbatch")) {
2561 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2562 return JNI_EINVAL;
2563 }
2564 // -Xmn for compatibility with other JVM vendors
2565 } else if (match_option(option, "-Xmn", &tail)) {
2566 julong long_initial_young_size = 0;
2567 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2568 if (errcode != arg_in_range) {
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Invalid initial young generation size: %s\n", option->optionString);
2571 describe_range_error(errcode);
2572 return JNI_EINVAL;
2573 }
2574 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2575 return JNI_EINVAL;
2576 }
2577 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2578 return JNI_EINVAL;
2579 }
2580 // -Xms
2581 } else if (match_option(option, "-Xms", &tail)) {
2582 julong long_initial_heap_size = 0;
2583 // an initial heap size of 0 means automatically determine
2584 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2585 if (errcode != arg_in_range) {
2586 jio_fprintf(defaultStream::error_stream(),
2587 "Invalid initial heap size: %s\n", option->optionString);
2588 describe_range_error(errcode);
2589 return JNI_EINVAL;
2590 }
2591 set_min_heap_size((size_t)long_initial_heap_size);
2592 // Currently the minimum size and the initial heap sizes are the same.
2593 // Can be overridden with -XX:InitialHeapSize.
2594 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2595 return JNI_EINVAL;
2596 }
2597 // -Xmx
2598 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2599 julong long_max_heap_size = 0;
2600 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2601 if (errcode != arg_in_range) {
2602 jio_fprintf(defaultStream::error_stream(),
2603 "Invalid maximum heap size: %s\n", option->optionString);
2604 describe_range_error(errcode);
2605 return JNI_EINVAL;
2606 }
2607 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2608 return JNI_EINVAL;
2609 }
2610 // Xmaxf
2611 } else if (match_option(option, "-Xmaxf", &tail)) {
2612 char* err;
2613 int maxf = (int)(strtod(tail, &err) * 100);
2614 if (*err != '\0' || *tail == '\0') {
2615 jio_fprintf(defaultStream::error_stream(),
2616 "Bad max heap free percentage size: %s\n",
2617 option->optionString);
2618 return JNI_EINVAL;
2619 } else {
2620 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2621 return JNI_EINVAL;
2622 }
2623 }
2624 // Xminf
2625 } else if (match_option(option, "-Xminf", &tail)) {
2626 char* err;
2627 int minf = (int)(strtod(tail, &err) * 100);
2628 if (*err != '\0' || *tail == '\0') {
2629 jio_fprintf(defaultStream::error_stream(),
2630 "Bad min heap free percentage size: %s\n",
2631 option->optionString);
2632 return JNI_EINVAL;
2633 } else {
2634 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2635 return JNI_EINVAL;
2636 }
2637 }
2638 // -Xss
2639 } else if (match_option(option, "-Xss", &tail)) {
2640 intx value = 0;
2641 jint err = parse_xss(option, tail, &value);
2642 if (err != JNI_OK) {
2643 return err;
2644 }
2645 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) {
2646 return JNI_EINVAL;
2647 }
2648 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2649 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2650 julong long_ReservedCodeCacheSize = 0;
2651
2652 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2653 if (errcode != arg_in_range) {
2654 jio_fprintf(defaultStream::error_stream(),
2655 "Invalid maximum code cache size: %s.\n", option->optionString);
2656 return JNI_EINVAL;
2657 }
2658 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2659 return JNI_EINVAL;
2660 }
2661 // -green
2662 } else if (match_option(option, "-green")) {
2663 jio_fprintf(defaultStream::error_stream(),
2664 "Green threads support not available\n");
2665 return JNI_EINVAL;
2666 // -native
2667 } else if (match_option(option, "-native")) {
2668 // HotSpot always uses native threads, ignore silently for compatibility
2669 // -Xrs
2670 } else if (match_option(option, "-Xrs")) {
2671 // Classic/EVM option, new functionality
2672 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2673 return JNI_EINVAL;
2674 }
2675 // -Xprof
2676 } else if (match_option(option, "-Xprof")) {
2677 char version[256];
2678 // Obsolete in JDK 10
2679 JDK_Version::jdk(10).to_string(version, sizeof(version));
2680 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2681 // -Xconcurrentio
2682 } else if (match_option(option, "-Xconcurrentio")) {
2683 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != JVMFlag::SUCCESS) {
2684 return JNI_EINVAL;
2685 }
2686 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2690 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != JVMFlag::SUCCESS) {
2691 return JNI_EINVAL;
2692 }
2693 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != JVMFlag::SUCCESS) { // 20Kb per thread added to new generation
2694 return JNI_EINVAL;
2695 }
2696
2697 // -Xinternalversion
2698 } else if (match_option(option, "-Xinternalversion")) {
2699 jio_fprintf(defaultStream::output_stream(), "%s\n",
2700 VM_Version::internal_vm_info_string());
2701 vm_exit(0);
2702 #ifndef PRODUCT
2703 // -Xprintflags
2704 } else if (match_option(option, "-Xprintflags")) {
2705 JVMFlag::printFlags(tty, false);
2706 vm_exit(0);
2707 #endif
2708 // -D
2709 } else if (match_option(option, "-D", &tail)) {
2710 const char* value;
2711 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2712 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2713 // abort if -Djava.endorsed.dirs is set
2714 jio_fprintf(defaultStream::output_stream(),
2715 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2716 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2717 return JNI_EINVAL;
2718 }
2719 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2720 *value != '\0' && strcmp(value, "\"\"") != 0) {
2721 // abort if -Djava.ext.dirs is set
2722 jio_fprintf(defaultStream::output_stream(),
2723 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2724 return JNI_EINVAL;
2725 }
2726 // Check for module related properties. They must be set using the modules
2727 // options. For example: use "--add-modules=java.sql", not
2728 // "-Djdk.module.addmods=java.sql"
2729 if (is_internal_module_property(option->optionString + 2)) {
2730 needs_module_property_warning = true;
2731 continue;
2732 }
2733
2734 if (!add_property(tail)) {
2735 return JNI_ENOMEM;
2736 }
2737 // Out of the box management support
2738 if (match_option(option, "-Dcom.sun.management", &tail)) {
2739 #if INCLUDE_MANAGEMENT
2740 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) {
2741 return JNI_EINVAL;
2742 }
2743 // management agent in module jdk.management.agent
2744 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2745 return JNI_ENOMEM;
2746 }
2747 #else
2748 jio_fprintf(defaultStream::output_stream(),
2749 "-Dcom.sun.management is not supported in this VM.\n");
2750 return JNI_ERR;
2751 #endif
2752 }
2753 // -Xint
2754 } else if (match_option(option, "-Xint")) {
2755 set_mode_flags(_int);
2756 // -Xmixed
2757 } else if (match_option(option, "-Xmixed")) {
2758 set_mode_flags(_mixed);
2759 // -Xcomp
2760 } else if (match_option(option, "-Xcomp")) {
2761 // for testing the compiler; turn off all flags that inhibit compilation
2762 set_mode_flags(_comp);
2763 // -Xshare:dump
2764 } else if (match_option(option, "-Xshare:dump")) {
2765 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2766 return JNI_EINVAL;
2767 }
2768 set_mode_flags(_int); // Prevent compilation, which creates objects
2769 // -Xshare:on
2770 } else if (match_option(option, "-Xshare:on")) {
2771 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2772 return JNI_EINVAL;
2773 }
2774 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 // -Xshare:auto
2778 } else if (match_option(option, "-Xshare:auto")) {
2779 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2780 return JNI_EINVAL;
2781 }
2782 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2783 return JNI_EINVAL;
2784 }
2785 // -Xshare:off
2786 } else if (match_option(option, "-Xshare:off")) {
2787 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 // -Xverify
2794 } else if (match_option(option, "-Xverify", &tail)) {
2795 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2796 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2797 return JNI_EINVAL;
2798 }
2799 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2800 return JNI_EINVAL;
2801 }
2802 } else if (strcmp(tail, ":remote") == 0) {
2803 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2804 return JNI_EINVAL;
2805 }
2806 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2807 return JNI_EINVAL;
2808 }
2809 } else if (strcmp(tail, ":none") == 0) {
2810 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2811 return JNI_EINVAL;
2812 }
2813 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2814 return JNI_EINVAL;
2815 }
2816 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2817 return JNI_EINVAL;
2818 }
2819 // -Xdebug
2820 } else if (match_option(option, "-Xdebug")) {
2821 // note this flag has been used, then ignore
2822 set_xdebug_mode(true);
2823 // -Xnoagent
2824 } else if (match_option(option, "-Xnoagent")) {
2825 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2826 } else if (match_option(option, "-Xloggc:", &tail)) {
2827 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2828 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2829 _gc_log_filename = os::strdup_check_oom(tail);
2830 } else if (match_option(option, "-Xlog", &tail)) {
2831 bool ret = false;
2832 if (strcmp(tail, ":help") == 0) {
2833 fileStream stream(defaultStream::output_stream());
2834 LogConfiguration::print_command_line_help(&stream);
2835 vm_exit(0);
2836 } else if (strcmp(tail, ":disable") == 0) {
2837 LogConfiguration::disable_logging();
2838 ret = true;
2839 } else if (*tail == '\0') {
2840 ret = LogConfiguration::parse_command_line_arguments();
2841 assert(ret, "-Xlog without arguments should never fail to parse");
2842 } else if (*tail == ':') {
2843 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2844 }
2845 if (ret == false) {
2846 jio_fprintf(defaultStream::error_stream(),
2847 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2848 tail);
2849 return JNI_EINVAL;
2850 }
2851 // JNI hooks
2852 } else if (match_option(option, "-Xcheck", &tail)) {
2853 if (!strcmp(tail, ":jni")) {
2854 #if !INCLUDE_JNI_CHECK
2855 warning("JNI CHECKING is not supported in this VM");
2856 #else
2857 CheckJNICalls = true;
2858 #endif // INCLUDE_JNI_CHECK
2859 } else if (is_bad_option(option, args->ignoreUnrecognized,
2860 "check")) {
2861 return JNI_EINVAL;
2862 }
2863 } else if (match_option(option, "vfprintf")) {
2864 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2865 } else if (match_option(option, "exit")) {
2866 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2867 } else if (match_option(option, "abort")) {
2868 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2869 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2870 // and the last option wins.
2871 } else if (match_option(option, "-XX:+NeverTenure")) {
2872 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2876 return JNI_EINVAL;
2877 }
2878 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2879 return JNI_EINVAL;
2880 }
2881 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2882 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2889 return JNI_EINVAL;
2890 }
2891 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2892 uintx max_tenuring_thresh = 0;
2893 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2896 return JNI_EINVAL;
2897 }
2898
2899 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902
2903 if (MaxTenuringThreshold == 0) {
2904 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 } else {
2911 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2912 return JNI_EINVAL;
2913 }
2914 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 }
2918 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2919 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2920 return JNI_EINVAL;
2921 }
2922 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2923 return JNI_EINVAL;
2924 }
2925 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2926 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2933 #if defined(DTRACE_ENABLED)
2934 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 #else // defined(DTRACE_ENABLED)
2947 jio_fprintf(defaultStream::error_stream(),
2948 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2949 return JNI_EINVAL;
2950 #endif // defined(DTRACE_ENABLED)
2951 #ifdef ASSERT
2952 } else if (match_option(option, "-XX:+FullGCALot")) {
2953 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) {
2954 return JNI_EINVAL;
2955 }
2956 // disable scavenge before parallel mark-compact
2957 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2958 return JNI_EINVAL;
2959 }
2960 #endif
2961 #if !INCLUDE_MANAGEMENT
2962 } else if (match_option(option, "-XX:+ManagementServer")) {
2963 jio_fprintf(defaultStream::error_stream(),
2964 "ManagementServer is not supported in this VM.\n");
2965 return JNI_ERR;
2966 #endif // INCLUDE_MANAGEMENT
2967 #if INCLUDE_JFR
2968 } else if (match_jfr_option(&option)) {
2969 return JNI_EINVAL;
2970 #endif
2971 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2972 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2973 // already been handled
2974 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2975 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2976 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2977 return JNI_EINVAL;
2978 }
2979 }
2980 // Unknown option
2981 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2982 return JNI_ERR;
2983 }
2984 }
2985
2986 // PrintSharedArchiveAndExit will turn on
2987 // -Xshare:on
2988 // -Xlog:class+path=info
2989 if (PrintSharedArchiveAndExit) {
2990 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2991 return JNI_EINVAL;
2992 }
2993 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2994 return JNI_EINVAL;
2995 }
2996 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2997 }
2998
2999 // Change the default value for flags which have different default values
3000 // when working with older JDKs.
3001 #ifdef LINUX
3002 if (JDK_Version::current().compare_major(6) <= 0 &&
3003 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3004 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3005 }
3006 #endif // LINUX
3007 fix_appclasspath();
3008 return JNI_OK;
3009 }
3010
3011 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3012 // For java.base check for duplicate --patch-module options being specified on the command line.
3013 // This check is only required for java.base, all other duplicate module specifications
3014 // will be checked during module system initialization. The module system initialization
3015 // will throw an ExceptionInInitializerError if this situation occurs.
3016 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3017 if (*patch_mod_javabase) {
3018 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3019 } else {
3020 *patch_mod_javabase = true;
3021 }
3022 }
3023
3024 // Create GrowableArray lazily, only if --patch-module has been specified
3025 if (_patch_mod_prefix == NULL) {
3026 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3027 }
3028
3029 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3030 }
3031
3032 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3033 //
3034 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3035 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3036 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3037 // path is treated as the current directory.
3038 //
3039 // This causes problems with CDS, which requires that all directories specified in the classpath
3040 // must be empty. In most cases, applications do NOT want to load classes from the current
3041 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3042 // scripts compatible with CDS.
3043 void Arguments::fix_appclasspath() {
3044 if (IgnoreEmptyClassPaths) {
3045 const char separator = *os::path_separator();
3046 const char* src = _java_class_path->value();
3047
3048 // skip over all the leading empty paths
3049 while (*src == separator) {
3050 src ++;
3051 }
3052
3053 char* copy = os::strdup_check_oom(src, mtArguments);
3054
3055 // trim all trailing empty paths
3056 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3057 *tail = '\0';
3058 }
3059
3060 char from[3] = {separator, separator, '\0'};
3061 char to [2] = {separator, '\0'};
3062 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3063 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3064 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3065 }
3066
3067 _java_class_path->set_writeable_value(copy);
3068 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3069 }
3070 }
3071
3072 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3073 // check if the default lib/endorsed directory exists; if so, error
3074 char path[JVM_MAXPATHLEN];
3075 const char* fileSep = os::file_separator();
3076 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3077
3078 DIR* dir = os::opendir(path);
3079 if (dir != NULL) {
3080 jio_fprintf(defaultStream::output_stream(),
3081 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3082 "in modular form will be supported via the concept of upgradeable modules.\n");
3083 os::closedir(dir);
3084 return JNI_ERR;
3085 }
3086
3087 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3088 dir = os::opendir(path);
3089 if (dir != NULL) {
3090 jio_fprintf(defaultStream::output_stream(),
3091 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3092 "Use -classpath instead.\n.");
3093 os::closedir(dir);
3094 return JNI_ERR;
3095 }
3096
3097 // This must be done after all arguments have been processed
3098 // and the container support has been initialized since AggressiveHeap
3099 // relies on the amount of total memory available.
3100 if (AggressiveHeap) {
3101 jint result = set_aggressive_heap_flags();
3102 if (result != JNI_OK) {
3103 return result;
3104 }
3105 }
3106
3107 // This must be done after all arguments have been processed.
3108 // java_compiler() true means set to "NONE" or empty.
3109 if (java_compiler() && !xdebug_mode()) {
3110 // For backwards compatibility, we switch to interpreted mode if
3111 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3112 // not specified.
3113 set_mode_flags(_int);
3114 }
3115
3116 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3117 // but like -Xint, leave compilation thresholds unaffected.
3118 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3119 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3120 set_mode_flags(_int);
3121 }
3122
3123 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3124 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3125 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3126 }
3127
3128 #if !COMPILER2_OR_JVMCI
3129 // Don't degrade server performance for footprint
3130 if (FLAG_IS_DEFAULT(UseLargePages) &&
3131 MaxHeapSize < LargePageHeapSizeThreshold) {
3132 // No need for large granularity pages w/small heaps.
3133 // Note that large pages are enabled/disabled for both the
3134 // Java heap and the code cache.
3135 FLAG_SET_DEFAULT(UseLargePages, false);
3136 }
3137
3138 UNSUPPORTED_OPTION(ProfileInterpreter);
3139 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3140 #endif
3141
3142 #ifndef TIERED
3143 // Tiered compilation is undefined.
3144 UNSUPPORTED_OPTION(TieredCompilation);
3145 #endif
3146
3147 if (!check_vm_args_consistency()) {
3148 return JNI_ERR;
3149 }
3150
3151 #if INCLUDE_CDS
3152 if (DumpSharedSpaces) {
3153 // Disable biased locking now as it interferes with the clean up of
3154 // the archived Klasses and Java string objects (at dump time only).
3155 UseBiasedLocking = false;
3156
3157 // Always verify non-system classes during CDS dump
3158 if (!BytecodeVerificationRemote) {
3159 BytecodeVerificationRemote = true;
3160 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3161 }
3162
3163 // Compilation is already disabled if the user specifies -Xshare:dump.
3164 // Disable compilation in case user specifies -XX:+DumpSharedSpaces instead of -Xshare:dump.
3165 set_mode_flags(_int);
3166 }
3167 if (UseSharedSpaces && patch_mod_javabase) {
3168 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3169 }
3170 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3171 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3172 }
3173 #endif
3174
3175 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3176 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3177 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3178
3179 return JNI_OK;
3180 }
3181
3182 // Helper class for controlling the lifetime of JavaVMInitArgs
3183 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3184 // deleted on the destruction of the ScopedVMInitArgs object.
3185 class ScopedVMInitArgs : public StackObj {
3186 private:
3187 JavaVMInitArgs _args;
3188 char* _container_name;
3189 bool _is_set;
3190 char* _vm_options_file_arg;
3191
3192 public:
3193 ScopedVMInitArgs(const char *container_name) {
3194 _args.version = JNI_VERSION_1_2;
3195 _args.nOptions = 0;
3196 _args.options = NULL;
3197 _args.ignoreUnrecognized = false;
3198 _container_name = (char *)container_name;
3199 _is_set = false;
3200 _vm_options_file_arg = NULL;
3201 }
3202
3203 // Populates the JavaVMInitArgs object represented by this
3204 // ScopedVMInitArgs object with the arguments in options. The
3205 // allocated memory is deleted by the destructor. If this method
3206 // returns anything other than JNI_OK, then this object is in a
3207 // partially constructed state, and should be abandoned.
3208 jint set_args(GrowableArray<JavaVMOption>* options) {
3209 _is_set = true;
3210 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3211 JavaVMOption, options->length(), mtArguments);
3212 if (options_arr == NULL) {
3213 return JNI_ENOMEM;
3214 }
3215 _args.options = options_arr;
3216
3217 for (int i = 0; i < options->length(); i++) {
3218 options_arr[i] = options->at(i);
3219 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3220 if (options_arr[i].optionString == NULL) {
3221 // Rely on the destructor to do cleanup.
3222 _args.nOptions = i;
3223 return JNI_ENOMEM;
3224 }
3225 }
3226
3227 _args.nOptions = options->length();
3228 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3229 return JNI_OK;
3230 }
3231
3232 JavaVMInitArgs* get() { return &_args; }
3233 char* container_name() { return _container_name; }
3234 bool is_set() { return _is_set; }
3235 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3236 char* vm_options_file_arg() { return _vm_options_file_arg; }
3237
3238 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3239 if (_vm_options_file_arg != NULL) {
3240 os::free(_vm_options_file_arg);
3241 }
3242 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3243 }
3244
3245 ~ScopedVMInitArgs() {
3246 if (_vm_options_file_arg != NULL) {
3247 os::free(_vm_options_file_arg);
3248 }
3249 if (_args.options == NULL) return;
3250 for (int i = 0; i < _args.nOptions; i++) {
3251 os::free(_args.options[i].optionString);
3252 }
3253 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3254 }
3255
3256 // Insert options into this option list, to replace option at
3257 // vm_options_file_pos (-XX:VMOptionsFile)
3258 jint insert(const JavaVMInitArgs* args,
3259 const JavaVMInitArgs* args_to_insert,
3260 const int vm_options_file_pos) {
3261 assert(_args.options == NULL, "shouldn't be set yet");
3262 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3263 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3264
3265 int length = args->nOptions + args_to_insert->nOptions - 1;
3266 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3267 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3268 for (int i = 0; i < args->nOptions; i++) {
3269 if (i == vm_options_file_pos) {
3270 // insert the new options starting at the same place as the
3271 // -XX:VMOptionsFile option
3272 for (int j = 0; j < args_to_insert->nOptions; j++) {
3273 options->push(args_to_insert->options[j]);
3274 }
3275 } else {
3276 options->push(args->options[i]);
3277 }
3278 }
3279 // make into options array
3280 jint result = set_args(options);
3281 delete options;
3282 return result;
3283 }
3284 };
3285
3286 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3287 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3288 }
3289
3290 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3291 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3292 }
3293
3294 jint Arguments::parse_options_environment_variable(const char* name,
3295 ScopedVMInitArgs* vm_args) {
3296 char *buffer = ::getenv(name);
3297
3298 // Don't check this environment variable if user has special privileges
3299 // (e.g. unix su command).
3300 if (buffer == NULL || os::have_special_privileges()) {
3301 return JNI_OK;
3302 }
3303
3304 if ((buffer = os::strdup(buffer)) == NULL) {
3305 return JNI_ENOMEM;
3306 }
3307
3308 jio_fprintf(defaultStream::error_stream(),
3309 "Picked up %s: %s\n", name, buffer);
3310
3311 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3312
3313 os::free(buffer);
3314 return retcode;
3315 }
3316
3317 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3318 // read file into buffer
3319 int fd = ::open(file_name, O_RDONLY);
3320 if (fd < 0) {
3321 jio_fprintf(defaultStream::error_stream(),
3322 "Could not open options file '%s'\n",
3323 file_name);
3324 return JNI_ERR;
3325 }
3326
3327 struct stat stbuf;
3328 int retcode = os::stat(file_name, &stbuf);
3329 if (retcode != 0) {
3330 jio_fprintf(defaultStream::error_stream(),
3331 "Could not stat options file '%s'\n",
3332 file_name);
3333 os::close(fd);
3334 return JNI_ERR;
3335 }
3336
3337 if (stbuf.st_size == 0) {
3338 // tell caller there is no option data and that is ok
3339 os::close(fd);
3340 return JNI_OK;
3341 }
3342
3343 // '+ 1' for NULL termination even with max bytes
3344 size_t bytes_alloc = stbuf.st_size + 1;
3345
3346 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3347 if (NULL == buf) {
3348 jio_fprintf(defaultStream::error_stream(),
3349 "Could not allocate read buffer for options file parse\n");
3350 os::close(fd);
3351 return JNI_ENOMEM;
3352 }
3353
3354 memset(buf, 0, bytes_alloc);
3355
3356 // Fill buffer
3357 // Use ::read() instead of os::read because os::read()
3358 // might do a thread state transition
3359 // and it is too early for that here
3360
3361 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3362 os::close(fd);
3363 if (bytes_read < 0) {
3364 FREE_C_HEAP_ARRAY(char, buf);
3365 jio_fprintf(defaultStream::error_stream(),
3366 "Could not read options file '%s'\n", file_name);
3367 return JNI_ERR;
3368 }
3369
3370 if (bytes_read == 0) {
3371 // tell caller there is no option data and that is ok
3372 FREE_C_HEAP_ARRAY(char, buf);
3373 return JNI_OK;
3374 }
3375
3376 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3377
3378 FREE_C_HEAP_ARRAY(char, buf);
3379 return retcode;
3380 }
3381
3382 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3383 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3384
3385 // some pointers to help with parsing
3386 char *buffer_end = buffer + buf_len;
3387 char *opt_hd = buffer;
3388 char *wrt = buffer;
3389 char *rd = buffer;
3390
3391 // parse all options
3392 while (rd < buffer_end) {
3393 // skip leading white space from the input string
3394 while (rd < buffer_end && isspace(*rd)) {
3395 rd++;
3396 }
3397
3398 if (rd >= buffer_end) {
3399 break;
3400 }
3401
3402 // Remember this is where we found the head of the token.
3403 opt_hd = wrt;
3404
3405 // Tokens are strings of non white space characters separated
3406 // by one or more white spaces.
3407 while (rd < buffer_end && !isspace(*rd)) {
3408 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3409 int quote = *rd; // matching quote to look for
3410 rd++; // don't copy open quote
3411 while (rd < buffer_end && *rd != quote) {
3412 // include everything (even spaces)
3413 // up until the close quote
3414 *wrt++ = *rd++; // copy to option string
3415 }
3416
3417 if (rd < buffer_end) {
3418 rd++; // don't copy close quote
3419 } else {
3420 // did not see closing quote
3421 jio_fprintf(defaultStream::error_stream(),
3422 "Unmatched quote in %s\n", name);
3423 delete options;
3424 return JNI_ERR;
3425 }
3426 } else {
3427 *wrt++ = *rd++; // copy to option string
3428 }
3429 }
3430
3431 // steal a white space character and set it to NULL
3432 *wrt++ = '\0';
3433 // We now have a complete token
3434
3435 JavaVMOption option;
3436 option.optionString = opt_hd;
3437 option.extraInfo = NULL;
3438
3439 options->append(option); // Fill in option
3440
3441 rd++; // Advance to next character
3442 }
3443
3444 // Fill out JavaVMInitArgs structure.
3445 jint status = vm_args->set_args(options);
3446
3447 delete options;
3448 return status;
3449 }
3450
3451 void Arguments::set_shared_spaces_flags() {
3452 if (DumpSharedSpaces) {
3453 if (FailOverToOldVerifier) {
3454 // Don't fall back to the old verifier on verification failure. If a
3455 // class fails verification with the split verifier, it might fail the
3456 // CDS runtime verifier constraint check. In that case, we don't want
3457 // to share the class. We only archive classes that pass the split verifier.
3458 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3459 }
3460
3461 if (RequireSharedSpaces) {
3462 warning("Cannot dump shared archive while using shared archive");
3463 }
3464 UseSharedSpaces = false;
3465 #ifdef _LP64
3466 if (!UseCompressedOops || !UseCompressedClassPointers) {
3467 vm_exit_during_initialization(
3468 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3469 }
3470 } else {
3471 if (!UseCompressedOops || !UseCompressedClassPointers) {
3472 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3473 }
3474 #endif
3475 }
3476 }
3477
3478 // Sharing support
3479 // Construct the path to the archive
3480 static char* get_shared_archive_path() {
3481 char *shared_archive_path;
3482 if (SharedArchiveFile == NULL) {
3483 char jvm_path[JVM_MAXPATHLEN];
3484 os::jvm_path(jvm_path, sizeof(jvm_path));
3485 char *end = strrchr(jvm_path, *os::file_separator());
3486 if (end != NULL) *end = '\0';
3487 size_t jvm_path_len = strlen(jvm_path);
3488 size_t file_sep_len = strlen(os::file_separator());
3489 const size_t len = jvm_path_len + file_sep_len + 20;
3490 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3491 if (shared_archive_path != NULL) {
3492 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3493 jvm_path, os::file_separator());
3494 }
3495 } else {
3496 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3497 }
3498 return shared_archive_path;
3499 }
3500
3501 #ifndef PRODUCT
3502 // Determine whether LogVMOutput should be implicitly turned on.
3503 static bool use_vm_log() {
3504 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3505 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3506 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3507 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3508 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3509 return true;
3510 }
3511
3512 #ifdef COMPILER1
3513 if (PrintC1Statistics) {
3514 return true;
3515 }
3516 #endif // COMPILER1
3517
3518 #ifdef COMPILER2
3519 if (PrintOptoAssembly || PrintOptoStatistics) {
3520 return true;
3521 }
3522 #endif // COMPILER2
3523
3524 return false;
3525 }
3526
3527 #endif // PRODUCT
3528
3529 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3530 for (int index = 0; index < args->nOptions; index++) {
3531 const JavaVMOption* option = args->options + index;
3532 const char* tail;
3533 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3534 return true;
3535 }
3536 }
3537 return false;
3538 }
3539
3540 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3541 const char* vm_options_file,
3542 const int vm_options_file_pos,
3543 ScopedVMInitArgs* vm_options_file_args,
3544 ScopedVMInitArgs* args_out) {
3545 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3546 if (code != JNI_OK) {
3547 return code;
3548 }
3549
3550 if (vm_options_file_args->get()->nOptions < 1) {
3551 return JNI_OK;
3552 }
3553
3554 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3555 jio_fprintf(defaultStream::error_stream(),
3556 "A VM options file may not refer to a VM options file. "
3557 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3558 "options file '%s' in options container '%s' is an error.\n",
3559 vm_options_file_args->vm_options_file_arg(),
3560 vm_options_file_args->container_name());
3561 return JNI_EINVAL;
3562 }
3563
3564 return args_out->insert(args, vm_options_file_args->get(),
3565 vm_options_file_pos);
3566 }
3567
3568 // Expand -XX:VMOptionsFile found in args_in as needed.
3569 // mod_args and args_out parameters may return values as needed.
3570 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3571 ScopedVMInitArgs* mod_args,
3572 JavaVMInitArgs** args_out) {
3573 jint code = match_special_option_and_act(args_in, mod_args);
3574 if (code != JNI_OK) {
3575 return code;
3576 }
3577
3578 if (mod_args->is_set()) {
3579 // args_in contains -XX:VMOptionsFile and mod_args contains the
3580 // original options from args_in along with the options expanded
3581 // from the VMOptionsFile. Return a short-hand to the caller.
3582 *args_out = mod_args->get();
3583 } else {
3584 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3585 }
3586 return JNI_OK;
3587 }
3588
3589 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3590 ScopedVMInitArgs* args_out) {
3591 // Remaining part of option string
3592 const char* tail;
3593 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3594
3595 for (int index = 0; index < args->nOptions; index++) {
3596 const JavaVMOption* option = args->options + index;
3597 if (ArgumentsExt::process_options(option)) {
3598 continue;
3599 }
3600 if (match_option(option, "-XX:Flags=", &tail)) {
3601 Arguments::set_jvm_flags_file(tail);
3602 continue;
3603 }
3604 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3605 if (vm_options_file_args.found_vm_options_file_arg()) {
3606 jio_fprintf(defaultStream::error_stream(),
3607 "The option '%s' is already specified in the options "
3608 "container '%s' so the specification of '%s' in the "
3609 "same options container is an error.\n",
3610 vm_options_file_args.vm_options_file_arg(),
3611 vm_options_file_args.container_name(),
3612 option->optionString);
3613 return JNI_EINVAL;
3614 }
3615 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3616 // If there's a VMOptionsFile, parse that
3617 jint code = insert_vm_options_file(args, tail, index,
3618 &vm_options_file_args, args_out);
3619 if (code != JNI_OK) {
3620 return code;
3621 }
3622 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3623 if (args_out->is_set()) {
3624 // The VMOptions file inserted some options so switch 'args'
3625 // to the new set of options, and continue processing which
3626 // preserves "last option wins" semantics.
3627 args = args_out->get();
3628 // The first option from the VMOptionsFile replaces the
3629 // current option. So we back track to process the
3630 // replacement option.
3631 index--;
3632 }
3633 continue;
3634 }
3635 if (match_option(option, "-XX:+PrintVMOptions")) {
3636 PrintVMOptions = true;
3637 continue;
3638 }
3639 if (match_option(option, "-XX:-PrintVMOptions")) {
3640 PrintVMOptions = false;
3641 continue;
3642 }
3643 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3644 IgnoreUnrecognizedVMOptions = true;
3645 continue;
3646 }
3647 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3648 IgnoreUnrecognizedVMOptions = false;
3649 continue;
3650 }
3651 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3652 JVMFlag::printFlags(tty, false);
3653 vm_exit(0);
3654 }
3655 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3656 #if INCLUDE_NMT
3657 // The launcher did not setup nmt environment variable properly.
3658 if (!MemTracker::check_launcher_nmt_support(tail)) {
3659 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3660 }
3661
3662 // Verify if nmt option is valid.
3663 if (MemTracker::verify_nmt_option()) {
3664 // Late initialization, still in single-threaded mode.
3665 if (MemTracker::tracking_level() >= NMT_summary) {
3666 MemTracker::init();
3667 }
3668 } else {
3669 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3670 }
3671 continue;
3672 #else
3673 jio_fprintf(defaultStream::error_stream(),
3674 "Native Memory Tracking is not supported in this VM\n");
3675 return JNI_ERR;
3676 #endif
3677 }
3678
3679 #ifndef PRODUCT
3680 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3681 JVMFlag::printFlags(tty, true);
3682 vm_exit(0);
3683 }
3684 #endif
3685 }
3686 return JNI_OK;
3687 }
3688
3689 static void print_options(const JavaVMInitArgs *args) {
3690 const char* tail;
3691 for (int index = 0; index < args->nOptions; index++) {
3692 const JavaVMOption *option = args->options + index;
3693 if (match_option(option, "-XX:", &tail)) {
3694 logOption(tail);
3695 }
3696 }
3697 }
3698
3699 bool Arguments::handle_deprecated_print_gc_flags() {
3700 if (PrintGC) {
3701 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3702 }
3703 if (PrintGCDetails) {
3704 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3705 }
3706
3707 if (_gc_log_filename != NULL) {
3708 // -Xloggc was used to specify a filename
3709 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3710
3711 LogTarget(Error, logging) target;
3712 LogStream errstream(target);
3713 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3714 } else if (PrintGC || PrintGCDetails) {
3715 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3716 }
3717 return true;
3718 }
3719
3720 void Arguments::handle_extra_cms_flags(const char* msg) {
3721 SpecialFlag flag;
3722 const char *flag_name = "UseConcMarkSweepGC";
3723 if (lookup_special_flag(flag_name, flag)) {
3724 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3725 warning("%s", msg);
3726 }
3727 }
3728
3729 // Parse entry point called from JNI_CreateJavaVM
3730
3731 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3732 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3733
3734 // Initialize ranges, constraints and writeables
3735 JVMFlagRangeList::init();
3736 JVMFlagConstraintList::init();
3737 JVMFlagWriteableList::init();
3738
3739 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3740 const char* hotspotrc = ".hotspotrc";
3741 bool settings_file_specified = false;
3742 bool needs_hotspotrc_warning = false;
3743 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3744 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3745
3746 // Pointers to current working set of containers
3747 JavaVMInitArgs* cur_cmd_args;
3748 JavaVMInitArgs* cur_java_options_args;
3749 JavaVMInitArgs* cur_java_tool_options_args;
3750
3751 // Containers for modified/expanded options
3752 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3753 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3754 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3755
3756
3757 jint code =
3758 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3759 if (code != JNI_OK) {
3760 return code;
3761 }
3762
3763 code = parse_java_options_environment_variable(&initial_java_options_args);
3764 if (code != JNI_OK) {
3765 return code;
3766 }
3767
3768 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3769 &mod_java_tool_options_args,
3770 &cur_java_tool_options_args);
3771 if (code != JNI_OK) {
3772 return code;
3773 }
3774
3775 code = expand_vm_options_as_needed(initial_cmd_args,
3776 &mod_cmd_args,
3777 &cur_cmd_args);
3778 if (code != JNI_OK) {
3779 return code;
3780 }
3781
3782 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3783 &mod_java_options_args,
3784 &cur_java_options_args);
3785 if (code != JNI_OK) {
3786 return code;
3787 }
3788
3789 const char* flags_file = Arguments::get_jvm_flags_file();
3790 settings_file_specified = (flags_file != NULL);
3791
3792 if (IgnoreUnrecognizedVMOptions) {
3793 cur_cmd_args->ignoreUnrecognized = true;
3794 cur_java_tool_options_args->ignoreUnrecognized = true;
3795 cur_java_options_args->ignoreUnrecognized = true;
3796 }
3797
3798 // Parse specified settings file
3799 if (settings_file_specified) {
3800 if (!process_settings_file(flags_file, true,
3801 cur_cmd_args->ignoreUnrecognized)) {
3802 return JNI_EINVAL;
3803 }
3804 } else {
3805 #ifdef ASSERT
3806 // Parse default .hotspotrc settings file
3807 if (!process_settings_file(".hotspotrc", false,
3808 cur_cmd_args->ignoreUnrecognized)) {
3809 return JNI_EINVAL;
3810 }
3811 #else
3812 struct stat buf;
3813 if (os::stat(hotspotrc, &buf) == 0) {
3814 needs_hotspotrc_warning = true;
3815 }
3816 #endif
3817 }
3818
3819 if (PrintVMOptions) {
3820 print_options(cur_java_tool_options_args);
3821 print_options(cur_cmd_args);
3822 print_options(cur_java_options_args);
3823 }
3824
3825 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3826 jint result = parse_vm_init_args(cur_java_tool_options_args,
3827 cur_java_options_args,
3828 cur_cmd_args);
3829
3830 if (result != JNI_OK) {
3831 return result;
3832 }
3833
3834 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3835 SharedArchivePath = get_shared_archive_path();
3836 if (SharedArchivePath == NULL) {
3837 return JNI_ENOMEM;
3838 }
3839
3840 // Set up VerifySharedSpaces
3841 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3842 VerifySharedSpaces = true;
3843 }
3844
3845 // Delay warning until here so that we've had a chance to process
3846 // the -XX:-PrintWarnings flag
3847 if (needs_hotspotrc_warning) {
3848 warning("%s file is present but has been ignored. "
3849 "Run with -XX:Flags=%s to load the file.",
3850 hotspotrc, hotspotrc);
3851 }
3852
3853 if (needs_module_property_warning) {
3854 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3855 " names that are reserved for internal use.");
3856 }
3857
3858 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3859 UNSUPPORTED_OPTION(UseLargePages);
3860 #endif
3861
3862 #if defined(AIX)
3863 UNSUPPORTED_OPTION(AllocateHeapAt);
3864 #endif
3865
3866 ArgumentsExt::report_unsupported_options();
3867
3868 #ifndef PRODUCT
3869 if (TraceBytecodesAt != 0) {
3870 TraceBytecodes = true;
3871 }
3872 if (CountCompiledCalls) {
3873 if (UseCounterDecay) {
3874 warning("UseCounterDecay disabled because CountCalls is set");
3875 UseCounterDecay = false;
3876 }
3877 }
3878 #endif // PRODUCT
3879
3880 if (ScavengeRootsInCode == 0) {
3881 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3882 warning("Forcing ScavengeRootsInCode non-zero");
3883 }
3884 ScavengeRootsInCode = 1;
3885 }
3886
3887 if (!handle_deprecated_print_gc_flags()) {
3888 return JNI_EINVAL;
3889 }
3890
3891 // Set object alignment values.
3892 set_object_alignment();
3893
3894 #if !INCLUDE_CDS
3895 if (DumpSharedSpaces || RequireSharedSpaces) {
3896 jio_fprintf(defaultStream::error_stream(),
3897 "Shared spaces are not supported in this VM\n");
3898 return JNI_ERR;
3899 }
3900 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3901 log_is_enabled(Info, cds)) {
3902 warning("Shared spaces are not supported in this VM");
3903 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3904 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3905 }
3906 no_shared_spaces("CDS Disabled");
3907 #endif // INCLUDE_CDS
3908
3909 return JNI_OK;
3910 }
3911
3912 jint Arguments::apply_ergo() {
3913 // Set flags based on ergonomics.
3914 jint result = set_ergonomics_flags();
3915 if (result != JNI_OK) return result;
3916
3917 // Set heap size based on available physical memory
3918 set_heap_size();
3919
3920 GCConfig::arguments()->initialize();
3921
3922 set_shared_spaces_flags();
3923
3924 // Initialize Metaspace flags and alignments
3925 Metaspace::ergo_initialize();
3926
3927 // Set compiler flags after GC is selected and GC specific
3928 // flags (LoopStripMiningIter) are set.
3929 CompilerConfig::ergo_initialize();
3930
3931 // Set bytecode rewriting flags
3932 set_bytecode_flags();
3933
3934 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3935 jint code = set_aggressive_opts_flags();
3936 if (code != JNI_OK) {
3937 return code;
3938 }
3939
3940 // Turn off biased locking for locking debug mode flags,
3941 // which are subtly different from each other but neither works with
3942 // biased locking
3943 if (UseHeavyMonitors
3944 #ifdef COMPILER1
3945 || !UseFastLocking
3946 #endif // COMPILER1
3947 #if INCLUDE_JVMCI
3948 || !JVMCIUseFastLocking
3949 #endif
3950 ) {
3951 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3952 // flag set to true on command line; warn the user that they
3953 // can't enable biased locking here
3954 warning("Biased Locking is not supported with locking debug flags"
3955 "; ignoring UseBiasedLocking flag." );
3956 }
3957 UseBiasedLocking = false;
3958 }
3959
3960 #ifdef CC_INTERP
3961 // Clear flags not supported on zero.
3962 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3963 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3964 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3965 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3966 #endif // CC_INTERP
3967
3968 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3969 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3970 DebugNonSafepoints = true;
3971 }
3972
3973 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3974 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3975 }
3976
3977 #ifndef PRODUCT
3978 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3979 if (use_vm_log()) {
3980 LogVMOutput = true;
3981 }
3982 }
3983 #endif // PRODUCT
3984
3985 if (PrintCommandLineFlags) {
3986 JVMFlag::printSetFlags(tty);
3987 }
3988
3989 // Apply CPU specific policy for the BiasedLocking
3990 if (UseBiasedLocking) {
3991 if (!VM_Version::use_biased_locking() &&
3992 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3993 UseBiasedLocking = false;
3994 }
3995 }
3996 #ifdef COMPILER2
3997 if (!UseBiasedLocking || EmitSync != 0) {
3998 UseOptoBiasInlining = false;
3999 }
4000 #endif
4001
4002 #if defined(IA32)
4003 // Only server compiler can optimize safepoints well enough.
4004 if (!is_server_compilation_mode_vm()) {
4005 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
4006 }
4007 #endif
4008
4009 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4010 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4011 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4012 } else {
4013 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4014 }
4015
4016 return JNI_OK;
4017 }
4018
4019 jint Arguments::adjust_after_os() {
4020 if (UseNUMA) {
4021 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4022 FLAG_SET_ERGO(bool, UseNUMA, false);
4023 } else if (UseParallelGC || UseParallelOldGC) {
4024 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4025 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4026 }
4027 }
4028 // UseNUMAInterleaving is set to ON for all collectors and
4029 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4030 // such as the parallel collector for Linux and Solaris will
4031 // interleave old gen and survivor spaces on top of NUMA
4032 // allocation policy for the eden space.
4033 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4034 // all platforms and ParallelGC on Windows will interleave all
4035 // of the heap spaces across NUMA nodes.
4036 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4037 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4038 }
4039 }
4040 return JNI_OK;
4041 }
4042
4043 int Arguments::PropertyList_count(SystemProperty* pl) {
4044 int count = 0;
4045 while(pl != NULL) {
4046 count++;
4047 pl = pl->next();
4048 }
4049 return count;
4050 }
4051
4052 // Return the number of readable properties.
4053 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4054 int count = 0;
4055 while(pl != NULL) {
4056 if (pl->is_readable()) {
4057 count++;
4058 }
4059 pl = pl->next();
4060 }
4061 return count;
4062 }
4063
4064 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4065 assert(key != NULL, "just checking");
4066 SystemProperty* prop;
4067 for (prop = pl; prop != NULL; prop = prop->next()) {
4068 if (strcmp(key, prop->key()) == 0) return prop->value();
4069 }
4070 return NULL;
4071 }
4072
4073 // Return the value of the requested property provided that it is a readable property.
4074 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4075 assert(key != NULL, "just checking");
4076 SystemProperty* prop;
4077 // Return the property value if the keys match and the property is not internal or
4078 // it's the special internal property "jdk.boot.class.path.append".
4079 for (prop = pl; prop != NULL; prop = prop->next()) {
4080 if (strcmp(key, prop->key()) == 0) {
4081 if (!prop->internal()) {
4082 return prop->value();
4083 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4084 return prop->value();
4085 } else {
4086 // Property is internal and not jdk.boot.class.path.append so return NULL.
4087 return NULL;
4088 }
4089 }
4090 }
4091 return NULL;
4092 }
4093
4094 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4095 int count = 0;
4096 const char* ret_val = NULL;
4097
4098 while(pl != NULL) {
4099 if(count >= index) {
4100 ret_val = pl->key();
4101 break;
4102 }
4103 count++;
4104 pl = pl->next();
4105 }
4106
4107 return ret_val;
4108 }
4109
4110 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4111 int count = 0;
4112 char* ret_val = NULL;
4113
4114 while(pl != NULL) {
4115 if(count >= index) {
4116 ret_val = pl->value();
4117 break;
4118 }
4119 count++;
4120 pl = pl->next();
4121 }
4122
4123 return ret_val;
4124 }
4125
4126 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4127 SystemProperty* p = *plist;
4128 if (p == NULL) {
4129 *plist = new_p;
4130 } else {
4131 while (p->next() != NULL) {
4132 p = p->next();
4133 }
4134 p->set_next(new_p);
4135 }
4136 }
4137
4138 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4139 bool writeable, bool internal) {
4140 if (plist == NULL)
4141 return;
4142
4143 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4144 PropertyList_add(plist, new_p);
4145 }
4146
4147 void Arguments::PropertyList_add(SystemProperty *element) {
4148 PropertyList_add(&_system_properties, element);
4149 }
4150
4151 // This add maintains unique property key in the list.
4152 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4153 PropertyAppendable append, PropertyWriteable writeable,
4154 PropertyInternal internal) {
4155 if (plist == NULL)
4156 return;
4157
4158 // If property key exist then update with new value.
4159 SystemProperty* prop;
4160 for (prop = *plist; prop != NULL; prop = prop->next()) {
4161 if (strcmp(k, prop->key()) == 0) {
4162 if (append == AppendProperty) {
4163 prop->append_value(v);
4164 } else {
4165 prop->set_value(v);
4166 }
4167 return;
4168 }
4169 }
4170
4171 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4172 }
4173
4174 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4175 // Returns true if all of the source pointed by src has been copied over to
4176 // the destination buffer pointed by buf. Otherwise, returns false.
4177 // Notes:
4178 // 1. If the length (buflen) of the destination buffer excluding the
4179 // NULL terminator character is not long enough for holding the expanded
4180 // pid characters, it also returns false instead of returning the partially
4181 // expanded one.
4182 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4183 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4184 char* buf, size_t buflen) {
4185 const char* p = src;
4186 char* b = buf;
4187 const char* src_end = &src[srclen];
4188 char* buf_end = &buf[buflen - 1];
4189
4190 while (p < src_end && b < buf_end) {
4191 if (*p == '%') {
4192 switch (*(++p)) {
4193 case '%': // "%%" ==> "%"
4194 *b++ = *p++;
4195 break;
4196 case 'p': { // "%p" ==> current process id
4197 // buf_end points to the character before the last character so
4198 // that we could write '\0' to the end of the buffer.
4199 size_t buf_sz = buf_end - b + 1;
4200 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4201
4202 // if jio_snprintf fails or the buffer is not long enough to hold
4203 // the expanded pid, returns false.
4204 if (ret < 0 || ret >= (int)buf_sz) {
4205 return false;
4206 } else {
4207 b += ret;
4208 assert(*b == '\0', "fail in copy_expand_pid");
4209 if (p == src_end && b == buf_end + 1) {
4210 // reach the end of the buffer.
4211 return true;
4212 }
4213 }
4214 p++;
4215 break;
4216 }
4217 default :
4218 *b++ = '%';
4219 }
4220 } else {
4221 *b++ = *p++;
4222 }
4223 }
4224 *b = '\0';
4225 return (p == src_end); // return false if not all of the source was copied
4226 }