1 /*
2 * Copyright (c) 1997, 2017, 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 "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.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.inline.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/commandLineFlagConstraintList.hpp"
46 #include "runtime/commandLineFlagWriteableList.hpp"
47 #include "runtime/commandLineFlagRangeList.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.hpp"
52 #include "runtime/vm_version.hpp"
53 #include "services/management.hpp"
54 #include "services/memTracker.hpp"
55 #include "utilities/defaultStream.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/stringUtils.hpp"
58 #if INCLUDE_JVMCI
59 #include "jvmci/jvmciRuntime.hpp"
60 #endif
61 #if INCLUDE_ALL_GCS
62 #include "gc/cms/compactibleFreeListSpace.hpp"
63 #include "gc/g1/g1CollectedHeap.inline.hpp"
64 #include "gc/parallel/parallelScavengeHeap.hpp"
65 #endif // INCLUDE_ALL_GCS
66
67 // Note: This is a special bug reporting site for the JVM
68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
69 #define DEFAULT_JAVA_LAUNCHER "generic"
70
71 char* Arguments::_jvm_flags_file = NULL;
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 bool Arguments::_has_profile = false;
80 size_t Arguments::_conservative_max_heap_alignment = 0;
81 size_t Arguments::_min_heap_size = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args()
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
113
114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
115 PathString *Arguments::_system_boot_class_path = NULL;
116 bool Arguments::_has_jimage = false;
117
118 char* Arguments::_ext_dirs = NULL;
119
120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
121 // part of the option string.
122 static bool match_option(const JavaVMOption *option, const char* name,
123 const char** tail) {
124 size_t len = strlen(name);
125 if (strncmp(option->optionString, name, len) == 0) {
126 *tail = option->optionString + len;
127 return true;
128 } else {
129 return false;
130 }
131 }
132
133 // Check if 'option' matches 'name'. No "tail" is allowed.
134 static bool match_option(const JavaVMOption *option, const char* name) {
135 const char* tail = NULL;
136 bool result = match_option(option, name, &tail);
137 if (tail != NULL && *tail == '\0') {
138 return result;
139 } else {
140 return false;
141 }
142 }
143
144 // Return true if any of the strings in null-terminated array 'names' matches.
145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
146 // the option must match exactly.
147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
148 bool tail_allowed) {
149 for (/* empty */; *names != NULL; ++names) {
150 if (match_option(option, *names, tail)) {
151 if (**tail == '\0' || tail_allowed && **tail == ':') {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 static void logOption(const char* opt) {
160 if (PrintVMOptions) {
161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
162 }
163 }
164
165 bool needs_module_property_warning = false;
166
167 #define MODULE_PROPERTY_PREFIX "jdk.module."
168 #define MODULE_PROPERTY_PREFIX_LEN 11
169 #define ADDEXPORTS "addexports"
170 #define ADDEXPORTS_LEN 10
171 #define ADDREADS "addreads"
172 #define ADDREADS_LEN 8
173 #define ADDOPENS "addopens"
174 #define ADDOPENS_LEN 8
175 #define PATCH "patch"
176 #define PATCH_LEN 5
177 #define ADDMODS "addmods"
178 #define ADDMODS_LEN 7
179 #define LIMITMODS "limitmods"
180 #define LIMITMODS_LEN 9
181 #define PATH "path"
182 #define PATH_LEN 4
183 #define UPGRADE_PATH "upgrade.path"
184 #define UPGRADE_PATH_LEN 12
185
186 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
187 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
188 return ((strncmp(option, property, len) == 0) &&
189 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
190 }
191
192 // Return true if property starts with "jdk.module." and its ensuing chars match
193 // any of the reserved module properties.
194 // property should be passed without the leading "-D".
195 bool Arguments::is_internal_module_property(const char* property) {
196 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
197 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
198 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
199 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
200 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
201 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
202 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
203 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
204 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
205 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
206 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
207 return true;
208 }
209 }
210 return false;
211 }
212
213 // Process java launcher properties.
214 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
215 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
216 // sun.java.launcher.pid is defined.
217 // Must do this before setting up other system properties,
218 // as some of them may depend on launcher type.
219 for (int index = 0; index < args->nOptions; index++) {
220 const JavaVMOption* option = args->options + index;
221 const char* tail;
222
223 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
224 process_java_launcher_argument(tail, option->extraInfo);
225 continue;
226 }
227 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
228 if (strcmp(tail, "true") == 0) {
229 _sun_java_launcher_is_altjvm = true;
230 }
231 continue;
232 }
233 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
234 _sun_java_launcher_pid = atoi(tail);
235 continue;
236 }
237 }
238 }
239
240 // Initialize system properties key and value.
241 void Arguments::init_system_properties() {
242
243 // Set up _system_boot_class_path which is not a property but
244 // relies heavily on argument processing and the jdk.boot.class.path.append
245 // property. It is used to store the underlying system boot class path.
246 _system_boot_class_path = new PathString(NULL);
247
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
249 "Java Virtual Machine Specification", false));
250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
253 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
254
255 // Following are JVMTI agent writable properties.
256 // Properties values are set to NULL and they are
257 // os specific they are initialized in os::init_system_properties_values().
258 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
259 _java_library_path = new SystemProperty("java.library.path", NULL, true);
260 _java_home = new SystemProperty("java.home", NULL, true);
261 _java_class_path = new SystemProperty("java.class.path", "", true);
262 // jdk.boot.class.path.append is a non-writeable, internal property.
263 // It can only be set by either:
264 // - -Xbootclasspath/a:
265 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
266 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
267
268 // Add to System Property list.
269 PropertyList_add(&_system_properties, _sun_boot_library_path);
270 PropertyList_add(&_system_properties, _java_library_path);
271 PropertyList_add(&_system_properties, _java_home);
272 PropertyList_add(&_system_properties, _java_class_path);
273 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
274
275 // Set OS specific system properties values
276 os::init_system_properties_values();
277 }
278
279 // Update/Initialize System properties after JDK version number is known
280 void Arguments::init_version_specific_system_properties() {
281 enum { bufsz = 16 };
282 char buffer[bufsz];
283 const char* spec_vendor = "Oracle Corporation";
284 uint32_t spec_version = JDK_Version::current().major_version();
285
286 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
287
288 PropertyList_add(&_system_properties,
289 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
290 PropertyList_add(&_system_properties,
291 new SystemProperty("java.vm.specification.version", buffer, false));
292 PropertyList_add(&_system_properties,
293 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
294 }
295
296 /*
297 * -XX argument processing:
298 *
299 * -XX arguments are defined in several places, such as:
300 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
301 * -XX arguments are parsed in parse_argument().
302 * -XX argument bounds checking is done in check_vm_args_consistency().
303 *
304 * Over time -XX arguments may change. There are mechanisms to handle common cases:
305 *
306 * ALIASED: An option that is simply another name for another option. This is often
307 * part of the process of deprecating a flag, but not all aliases need
308 * to be deprecated.
309 *
310 * Create an alias for an option by adding the old and new option names to the
311 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
312 *
313 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
314 * support may be removed in the future. Both regular and aliased options may be
315 * deprecated.
316 *
317 * Add a deprecation warning for an option (or alias) by adding an entry in the
318 * "special_jvm_flags" table and setting the "deprecated_in" field.
319 * Often an option "deprecated" in one major release will
320 * be made "obsolete" in the next. In this case the entry should also have it's
321 * "obsolete_in" field set.
322 *
323 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
324 * on the command line. A warning is printed to let the user know that option might not
325 * be accepted in the future.
326 *
327 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
328 * table and setting the "obsolete_in" field.
329 *
330 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
331 * to the current JDK version. The system will flatly refuse to admit the existence of
332 * the flag. This allows a flag to die automatically over JDK releases.
333 *
334 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
335 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
336 * - Newly obsolete or expired deprecated options should have their global variable
337 * definitions removed (from globals.hpp, etc) and related implementations removed.
338 *
339 * Recommended approach for removing options:
340 *
341 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
342 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
343 *
344 * To remove internal options (e.g. diagnostic, experimental, develop options), use
345 * a 2-step model adding major release numbers to the obsolete and expire columns.
346 *
347 * To change the name of an option, use the alias table as well as a 2-step
348 * model adding major release numbers to the deprecate and expire columns.
349 * Think twice about aliasing commonly used customer options.
350 *
351 * There are times when it is appropriate to leave a future release number as undefined.
352 *
353 * Tests: Aliases should be tested in VMAliasOptions.java.
354 * Deprecated options should be tested in VMDeprecatedOptions.java.
355 */
356
357 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
358 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
359 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
360 // the command-line as usual, but will issue a warning.
361 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
362 // the command-line, while issuing a warning and ignoring the flag value.
363 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
364 // existence of the flag.
365 //
366 // MANUAL CLEANUP ON JDK VERSION UPDATES:
367 // This table ensures that the handling of options will update automatically when the JDK
368 // version is incremented, but the source code needs to be cleanup up manually:
369 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
370 // variable should be removed, as well as users of the variable.
371 // - As "deprecated" options age into "obsolete" options, move the entry into the
372 // "Obsolete Flags" section of the table.
373 // - All expired options should be removed from the table.
374 static SpecialFlag const special_jvm_flags[] = {
375 // -------------- Deprecated Flags --------------
376 // --- Non-alias flags - sorted by obsolete_in then expired_in:
377 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
378
379 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
380 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
381 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
382
383 // -------------- Obsolete Flags - sorted by expired_in --------------
384 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
385 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
386 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
387 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
388 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
389
390 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
391 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
392 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
393 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
394 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
395 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
396 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
397 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
398 #endif
399
400 { NULL, JDK_Version(0), JDK_Version(0) }
401 };
402
403 // Flags that are aliases for other flags.
404 typedef struct {
405 const char* alias_name;
406 const char* real_name;
407 } AliasedFlag;
408
409 static AliasedFlag const aliased_jvm_flags[] = {
410 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
411 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
412 { NULL, NULL}
413 };
414
415 // NOTE: A compatibility request will be necessary for each alias to be removed.
416 static AliasedLoggingFlag const aliased_logging_flags[] = {
417 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
418 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
419 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
420 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
421 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
422 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
423 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
424 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
425 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
426 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
427 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
428 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
429 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
430 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
431 };
432
433 #ifndef PRODUCT
434 // These options are removed in jdk9. Remove this code for jdk10.
435 static AliasedFlag const removed_develop_logging_flags[] = {
436 { "TraceClassInitialization", "-Xlog:class+init" },
437 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
438 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
439 { "TraceItables", "-Xlog:itables=debug" },
440 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
441 { "TraceSafepoint", "-Xlog:safepoint=debug" },
442 { "TraceStartupTime", "-Xlog:startuptime" },
443 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
444 { "PrintVtables", "-Xlog:vtables=debug" },
445 { "VerboseVerification", "-Xlog:verification" },
446 { NULL, NULL }
447 };
448 #endif //PRODUCT
449
450 // Return true if "v" is less than "other", where "other" may be "undefined".
451 static bool version_less_than(JDK_Version v, JDK_Version other) {
452 assert(!v.is_undefined(), "must be defined");
453 if (!other.is_undefined() && v.compare(other) >= 0) {
454 return false;
455 } else {
456 return true;
457 }
458 }
459
460 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
461
462 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
463 // Allow extensions to have priority
464 if (lookup_special_flag_ext(flag_name, flag)) {
465 return true;
466 }
467
468 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
469 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
470 flag = special_jvm_flags[i];
471 return true;
472 }
473 }
474 return false;
475 }
476
477 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
478 assert(version != NULL, "Must provide a version buffer");
479 SpecialFlag flag;
480 if (lookup_special_flag(flag_name, flag)) {
481 if (!flag.obsolete_in.is_undefined()) {
482 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
483 *version = flag.obsolete_in;
484 return true;
485 }
486 }
487 }
488 return false;
489 }
490
491 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
492 assert(version != NULL, "Must provide a version buffer");
493 SpecialFlag flag;
494 if (lookup_special_flag(flag_name, flag)) {
495 if (!flag.deprecated_in.is_undefined()) {
496 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
497 version_less_than(JDK_Version::current(), flag.expired_in)) {
498 *version = flag.deprecated_in;
499 return 1;
500 } else {
501 return -1;
502 }
503 }
504 }
505 return 0;
506 }
507
508 #ifndef PRODUCT
509 const char* Arguments::removed_develop_logging_flag_name(const char* name){
510 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
511 const AliasedFlag& flag = removed_develop_logging_flags[i];
512 if (strcmp(flag.alias_name, name) == 0) {
513 return flag.real_name;
514 }
515 }
516 return NULL;
517 }
518 #endif // PRODUCT
519
520 const char* Arguments::real_flag_name(const char *flag_name) {
521 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
522 const AliasedFlag& flag_status = aliased_jvm_flags[i];
523 if (strcmp(flag_status.alias_name, flag_name) == 0) {
524 return flag_status.real_name;
525 }
526 }
527 return flag_name;
528 }
529
530 #ifdef ASSERT
531 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
532 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
533 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
534 return true;
535 }
536 }
537 return false;
538 }
539
540 static bool verify_special_jvm_flags() {
541 bool success = true;
542 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
543 const SpecialFlag& flag = special_jvm_flags[i];
544 if (lookup_special_flag(flag.name, i)) {
545 warning("Duplicate special flag declaration \"%s\"", flag.name);
546 success = false;
547 }
548 if (flag.deprecated_in.is_undefined() &&
549 flag.obsolete_in.is_undefined()) {
550 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
551 success = false;
552 }
553
554 if (!flag.deprecated_in.is_undefined()) {
555 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
556 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
557 success = false;
558 }
559
560 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
561 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
562 success = false;
563 }
564 }
565
566 if (!flag.obsolete_in.is_undefined()) {
567 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
568 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
569 success = false;
570 }
571
572 // if flag has become obsolete it should not have a "globals" flag defined anymore.
573 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
574 if (Flag::find_flag(flag.name) != NULL) {
575 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
576 success = false;
577 }
578 }
579 }
580
581 if (!flag.expired_in.is_undefined()) {
582 // if flag has become expired it should not have a "globals" flag defined anymore.
583 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
584 if (Flag::find_flag(flag.name) != NULL) {
585 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
586 success = false;
587 }
588 }
589 }
590
591 }
592 return success;
593 }
594 #endif
595
596 // Parses a size specification string.
597 bool Arguments::atojulong(const char *s, julong* result) {
598 julong n = 0;
599
600 // First char must be a digit. Don't allow negative numbers or leading spaces.
601 if (!isdigit(*s)) {
602 return false;
603 }
604
605 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
606 char* remainder;
607 errno = 0;
608 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
609 if (errno != 0) {
610 return false;
611 }
612
613 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
614 if (remainder == s || strlen(remainder) > 1) {
615 return false;
616 }
617
618 switch (*remainder) {
619 case 'T': case 't':
620 *result = n * G * K;
621 // Check for overflow.
622 if (*result/((julong)G * K) != n) return false;
623 return true;
624 case 'G': case 'g':
625 *result = n * G;
626 if (*result/G != n) return false;
627 return true;
628 case 'M': case 'm':
629 *result = n * M;
630 if (*result/M != n) return false;
631 return true;
632 case 'K': case 'k':
633 *result = n * K;
634 if (*result/K != n) return false;
635 return true;
636 case '\0':
637 *result = n;
638 return true;
639 default:
640 return false;
641 }
642 }
643
644 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
645 if (size < min_size) return arg_too_small;
646 // Check that size will fit in a size_t (only relevant on 32-bit)
647 if (size > max_uintx) return arg_too_big;
648 return arg_in_range;
649 }
650
651 // Describe an argument out of range error
652 void Arguments::describe_range_error(ArgsRange errcode) {
653 switch(errcode) {
654 case arg_too_big:
655 jio_fprintf(defaultStream::error_stream(),
656 "The specified size exceeds the maximum "
657 "representable size.\n");
658 break;
659 case arg_too_small:
660 case arg_unreadable:
661 case arg_in_range:
662 // do nothing for now
663 break;
664 default:
665 ShouldNotReachHere();
666 }
667 }
668
669 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
670 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
671 return true;
672 } else {
673 return false;
674 }
675 }
676
677 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
678 char* end;
679 errno = 0;
680 double v = strtod(value, &end);
681 if ((errno != 0) || (*end != 0)) {
682 return false;
683 }
684
685 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
686 return true;
687 }
688 return false;
689 }
690
691 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
692 julong v;
693 int int_v;
694 intx intx_v;
695 bool is_neg = false;
696 Flag* result = Flag::find_flag(name, strlen(name));
697
698 if (result == NULL) {
699 return false;
700 }
701
702 // Check the sign first since atojulong() parses only unsigned values.
703 if (*value == '-') {
704 if (!result->is_intx() && !result->is_int()) {
705 return false;
706 }
707 value++;
708 is_neg = true;
709 }
710 if (!Arguments::atojulong(value, &v)) {
711 return false;
712 }
713 if (result->is_int()) {
714 int_v = (int) v;
715 if (is_neg) {
716 int_v = -int_v;
717 }
718 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
719 } else if (result->is_uint()) {
720 uint uint_v = (uint) v;
721 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
722 } else if (result->is_intx()) {
723 intx_v = (intx) v;
724 if (is_neg) {
725 intx_v = -intx_v;
726 }
727 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
728 } else if (result->is_uintx()) {
729 uintx uintx_v = (uintx) v;
730 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
731 } else if (result->is_uint64_t()) {
732 uint64_t uint64_t_v = (uint64_t) v;
733 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
734 } else if (result->is_size_t()) {
735 size_t size_t_v = (size_t) v;
736 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
737 } else {
738 return false;
739 }
740 }
741
742 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
743 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
744 // Contract: CommandLineFlags always returns a pointer that needs freeing.
745 FREE_C_HEAP_ARRAY(char, value);
746 return true;
747 }
748
749 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
750 const char* old_value = "";
751 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
752 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
753 size_t new_len = strlen(new_value);
754 const char* value;
755 char* free_this_too = NULL;
756 if (old_len == 0) {
757 value = new_value;
758 } else if (new_len == 0) {
759 value = old_value;
760 } else {
761 size_t length = old_len + 1 + new_len + 1;
762 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
763 // each new setting adds another LINE to the switch:
764 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
765 value = buf;
766 free_this_too = buf;
767 }
768 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
769 // CommandLineFlags always returns a pointer that needs freeing.
770 FREE_C_HEAP_ARRAY(char, value);
771 if (free_this_too != NULL) {
772 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
773 FREE_C_HEAP_ARRAY(char, free_this_too);
774 }
775 return true;
776 }
777
778 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
779 const char* real_name = real_flag_name(arg);
780 JDK_Version since = JDK_Version();
781 switch (is_deprecated_flag(arg, &since)) {
782 case -1:
783 return NULL; // obsolete or expired, don't process normally
784 case 0:
785 return real_name;
786 case 1: {
787 if (warn) {
788 char version[256];
789 since.to_string(version, sizeof(version));
790 if (real_name != arg) {
791 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
792 arg, version, real_name);
793 } else {
794 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
795 arg, version);
796 }
797 }
798 return real_name;
799 }
800 }
801 ShouldNotReachHere();
802 return NULL;
803 }
804
805 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
806 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
807 // Set tagset string buffer at max size of 256, large enough for any alias tagset
808 const int max_tagset_size = 256;
809 int max_tagset_len = max_tagset_size - 1;
810 char tagset_buffer[max_tagset_size];
811 tagset_buffer[0] = '\0';
812
813 // Write tag-set for aliased logging option, in string list form
814 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
815 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
816 if (i > 0) {
817 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
818 }
819 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
820 }
821 if (!alf.exactMatch) {
822 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
823 }
824 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
825 (on) ? "+" : "-",
826 name,
827 tagset_buffer,
828 (on) ? LogLevel::name(alf.level) : "off");
829 }
830
831 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
832 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
833 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
834 if (strcmp(alf.alias_name, name) == 0) {
835 log_deprecated_flag(name, on, alf);
836 return alf;
837 }
838 }
839 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
840 return a;
841 }
842
843 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
844
845 // range of acceptable characters spelled out for portability reasons
846 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
847 #define BUFLEN 255
848 char name[BUFLEN+1];
849 char dummy;
850 const char* real_name;
851 bool warn_if_deprecated = true;
852
853 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
854 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
855 if (alf.alias_name != NULL){
856 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
857 return true;
858 }
859 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
860 if (real_name == NULL) {
861 return false;
862 }
863 return set_bool_flag(real_name, false, origin);
864 }
865 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
866 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
867 if (alf.alias_name != NULL){
868 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
869 return true;
870 }
871 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
872 if (real_name == NULL) {
873 return false;
874 }
875 return set_bool_flag(real_name, true, origin);
876 }
877
878 char punct;
879 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
880 const char* value = strchr(arg, '=') + 1;
881 Flag* flag;
882
883 // this scanf pattern matches both strings (handled here) and numbers (handled later))
884 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
885 if (alf.alias_name != NULL) {
886 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
887 return true;
888 }
889 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
890 if (real_name == NULL) {
891 return false;
892 }
893 flag = Flag::find_flag(real_name);
894 if (flag != NULL && flag->is_ccstr()) {
895 if (flag->ccstr_accumulates()) {
896 return append_to_string_flag(real_name, value, origin);
897 } else {
898 if (value[0] == '\0') {
899 value = NULL;
900 }
901 return set_string_flag(real_name, value, origin);
902 }
903 } else {
904 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
905 }
906 }
907
908 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
909 const char* value = strchr(arg, '=') + 1;
910 // -XX:Foo:=xxx will reset the string flag to the given value.
911 if (value[0] == '\0') {
912 value = NULL;
913 }
914 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
915 if (real_name == NULL) {
916 return false;
917 }
918 return set_string_flag(real_name, value, origin);
919 }
920
921 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
922 #define SIGNED_NUMBER_RANGE "[-0123456789]"
923 #define NUMBER_RANGE "[0123456789eE+-]"
924 char value[BUFLEN + 1];
925 char value2[BUFLEN + 1];
926 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
927 // Looks like a floating-point number -- try again with more lenient format string
928 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
929 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
930 if (real_name == NULL) {
931 return false;
932 }
933 return set_fp_numeric_flag(real_name, value, origin);
934 }
935 }
936
937 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
938 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
939 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
940 if (real_name == NULL) {
941 return false;
942 }
943 return set_numeric_flag(real_name, value, origin);
944 }
945
946 return false;
947 }
948
949 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
950 assert(bldarray != NULL, "illegal argument");
951
952 if (arg == NULL) {
953 return;
954 }
955
956 int new_count = *count + 1;
957
958 // expand the array and add arg to the last element
959 if (*bldarray == NULL) {
960 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
961 } else {
962 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
963 }
964 (*bldarray)[*count] = os::strdup_check_oom(arg);
965 *count = new_count;
966 }
967
968 void Arguments::build_jvm_args(const char* arg) {
969 add_string(&_jvm_args_array, &_num_jvm_args, arg);
970 }
971
972 void Arguments::build_jvm_flags(const char* arg) {
973 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
974 }
975
976 // utility function to return a string that concatenates all
977 // strings in a given char** array
978 const char* Arguments::build_resource_string(char** args, int count) {
979 if (args == NULL || count == 0) {
980 return NULL;
981 }
982 size_t length = 0;
983 for (int i = 0; i < count; i++) {
984 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
985 }
986 char* s = NEW_RESOURCE_ARRAY(char, length);
987 char* dst = s;
988 for (int j = 0; j < count; j++) {
989 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
990 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
991 dst += offset;
992 length -= offset;
993 }
994 return (const char*) s;
995 }
996
997 void Arguments::print_on(outputStream* st) {
998 st->print_cr("VM Arguments:");
999 if (num_jvm_flags() > 0) {
1000 st->print("jvm_flags: "); print_jvm_flags_on(st);
1001 st->cr();
1002 }
1003 if (num_jvm_args() > 0) {
1004 st->print("jvm_args: "); print_jvm_args_on(st);
1005 st->cr();
1006 }
1007 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1008 if (_java_class_path != NULL) {
1009 char* path = _java_class_path->value();
1010 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1011 }
1012 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1013 }
1014
1015 void Arguments::print_summary_on(outputStream* st) {
1016 // Print the command line. Environment variables that are helpful for
1017 // reproducing the problem are written later in the hs_err file.
1018 // flags are from setting file
1019 if (num_jvm_flags() > 0) {
1020 st->print_raw("Settings File: ");
1021 print_jvm_flags_on(st);
1022 st->cr();
1023 }
1024 // args are the command line and environment variable arguments.
1025 st->print_raw("Command Line: ");
1026 if (num_jvm_args() > 0) {
1027 print_jvm_args_on(st);
1028 }
1029 // this is the classfile and any arguments to the java program
1030 if (java_command() != NULL) {
1031 st->print("%s", java_command());
1032 }
1033 st->cr();
1034 }
1035
1036 void Arguments::print_jvm_flags_on(outputStream* st) {
1037 if (_num_jvm_flags > 0) {
1038 for (int i=0; i < _num_jvm_flags; i++) {
1039 st->print("%s ", _jvm_flags_array[i]);
1040 }
1041 }
1042 }
1043
1044 void Arguments::print_jvm_args_on(outputStream* st) {
1045 if (_num_jvm_args > 0) {
1046 for (int i=0; i < _num_jvm_args; i++) {
1047 st->print("%s ", _jvm_args_array[i]);
1048 }
1049 }
1050 }
1051
1052 bool Arguments::process_argument(const char* arg,
1053 jboolean ignore_unrecognized,
1054 Flag::Flags origin) {
1055 JDK_Version since = JDK_Version();
1056
1057 if (parse_argument(arg, origin)) {
1058 return true;
1059 }
1060
1061 // Determine if the flag has '+', '-', or '=' characters.
1062 bool has_plus_minus = (*arg == '+' || *arg == '-');
1063 const char* const argname = has_plus_minus ? arg + 1 : arg;
1064
1065 size_t arg_len;
1066 const char* equal_sign = strchr(argname, '=');
1067 if (equal_sign == NULL) {
1068 arg_len = strlen(argname);
1069 } else {
1070 arg_len = equal_sign - argname;
1071 }
1072
1073 // Only make the obsolete check for valid arguments.
1074 if (arg_len <= BUFLEN) {
1075 // Construct a string which consists only of the argument name without '+', '-', or '='.
1076 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1077 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1078 if (is_obsolete_flag(stripped_argname, &since)) {
1079 char version[256];
1080 since.to_string(version, sizeof(version));
1081 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1082 return true;
1083 }
1084 #ifndef PRODUCT
1085 else {
1086 const char* replacement;
1087 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1088 log_warning(arguments)("%s has been removed. Please use %s instead.",
1089 stripped_argname,
1090 replacement);
1091 return false;
1092 }
1093 }
1094 #endif //PRODUCT
1095 }
1096
1097 // For locked flags, report a custom error message if available.
1098 // Otherwise, report the standard unrecognized VM option.
1099 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1100 if (found_flag != NULL) {
1101 char locked_message_buf[BUFLEN];
1102 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1103 if (strlen(locked_message_buf) == 0) {
1104 if (found_flag->is_bool() && !has_plus_minus) {
1105 jio_fprintf(defaultStream::error_stream(),
1106 "Missing +/- setting for VM option '%s'\n", argname);
1107 } else if (!found_flag->is_bool() && has_plus_minus) {
1108 jio_fprintf(defaultStream::error_stream(),
1109 "Unexpected +/- setting in VM option '%s'\n", argname);
1110 } else {
1111 jio_fprintf(defaultStream::error_stream(),
1112 "Improperly specified VM option '%s'\n", argname);
1113 }
1114 } else {
1115 #ifdef PRODUCT
1116 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1117 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1118 if (ignore_unrecognized && mismatched) {
1119 return true;
1120 }
1121 #endif
1122 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1123 }
1124 } else {
1125 if (ignore_unrecognized) {
1126 return true;
1127 }
1128 jio_fprintf(defaultStream::error_stream(),
1129 "Unrecognized VM option '%s'\n", argname);
1130 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1131 if (fuzzy_matched != NULL) {
1132 jio_fprintf(defaultStream::error_stream(),
1133 "Did you mean '%s%s%s'? ",
1134 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1135 fuzzy_matched->_name,
1136 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1137 }
1138 }
1139
1140 // allow for commandline "commenting out" options like -XX:#+Verbose
1141 return arg[0] == '#';
1142 }
1143
1144 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1145 FILE* stream = fopen(file_name, "rb");
1146 if (stream == NULL) {
1147 if (should_exist) {
1148 jio_fprintf(defaultStream::error_stream(),
1149 "Could not open settings file %s\n", file_name);
1150 return false;
1151 } else {
1152 return true;
1153 }
1154 }
1155
1156 char token[1024];
1157 int pos = 0;
1158
1159 bool in_white_space = true;
1160 bool in_comment = false;
1161 bool in_quote = false;
1162 char quote_c = 0;
1163 bool result = true;
1164
1165 int c = getc(stream);
1166 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1167 if (in_white_space) {
1168 if (in_comment) {
1169 if (c == '\n') in_comment = false;
1170 } else {
1171 if (c == '#') in_comment = true;
1172 else if (!isspace(c)) {
1173 in_white_space = false;
1174 token[pos++] = c;
1175 }
1176 }
1177 } else {
1178 if (c == '\n' || (!in_quote && isspace(c))) {
1179 // token ends at newline, or at unquoted whitespace
1180 // this allows a way to include spaces in string-valued options
1181 token[pos] = '\0';
1182 logOption(token);
1183 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1184 build_jvm_flags(token);
1185 pos = 0;
1186 in_white_space = true;
1187 in_quote = false;
1188 } else if (!in_quote && (c == '\'' || c == '"')) {
1189 in_quote = true;
1190 quote_c = c;
1191 } else if (in_quote && (c == quote_c)) {
1192 in_quote = false;
1193 } else {
1194 token[pos++] = c;
1195 }
1196 }
1197 c = getc(stream);
1198 }
1199 if (pos > 0) {
1200 token[pos] = '\0';
1201 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1202 build_jvm_flags(token);
1203 }
1204 fclose(stream);
1205 return result;
1206 }
1207
1208 //=============================================================================================================
1209 // Parsing of properties (-D)
1210
1211 const char* Arguments::get_property(const char* key) {
1212 return PropertyList_get_value(system_properties(), key);
1213 }
1214
1215 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1216 const char* eq = strchr(prop, '=');
1217 const char* key;
1218 const char* value = "";
1219
1220 if (eq == NULL) {
1221 // property doesn't have a value, thus use passed string
1222 key = prop;
1223 } else {
1224 // property have a value, thus extract it and save to the
1225 // allocated string
1226 size_t key_len = eq - prop;
1227 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1228
1229 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1230 key = tmp_key;
1231
1232 value = &prop[key_len + 1];
1233 }
1234
1235 if (strcmp(key, "java.compiler") == 0) {
1236 process_java_compiler_argument(value);
1237 // Record value in Arguments, but let it get passed to Java.
1238 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1239 strcmp(key, "sun.java.launcher.pid") == 0) {
1240 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1241 // private and are processed in process_sun_java_launcher_properties();
1242 // the sun.java.launcher property is passed on to the java application
1243 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1244 // append is true, writable is true, internal is false
1245 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1246 WriteableProperty, ExternalProperty);
1247 } else {
1248 if (strcmp(key, "sun.java.command") == 0) {
1249 char *old_java_command = _java_command;
1250 _java_command = os::strdup_check_oom(value, mtArguments);
1251 if (old_java_command != NULL) {
1252 os::free(old_java_command);
1253 }
1254 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1255 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1256 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1257 // its value without going through the property list or making a Java call.
1258 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1259 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1260 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1261 os::free((void *)old_java_vendor_url_bug);
1262 }
1263 }
1264
1265 // Create new property and add at the end of the list
1266 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1267 }
1268
1269 if (key != prop) {
1270 // SystemProperty copy passed value, thus free previously allocated
1271 // memory
1272 FreeHeap((void *)key);
1273 }
1274
1275 return true;
1276 }
1277
1278 #if INCLUDE_CDS
1279 void Arguments::check_unsupported_dumping_properties() {
1280 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1281 const char* unsupported_properties[] = { "jdk.module.main",
1282 "jdk.module.limitmods",
1283 "jdk.module.path",
1284 "jdk.module.upgrade.path",
1285 "jdk.module.addmods.0",
1286 "jdk.module.patch.0" };
1287 const char* unsupported_options[] = { "-m", // cannot use at dump time
1288 "--limit-modules", // ignored at dump time
1289 "--module-path", // ignored at dump time
1290 "--upgrade-module-path", // ignored at dump time
1291 "--add-modules", // ignored at dump time
1292 "--patch-module" // ignored at dump time
1293 };
1294 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1295 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1296 // vm will exit with an error message. Otherwise, it will print an informational message if
1297 // PrintSharedSpaces is enabled.
1298 uint info_idx = 1;
1299 SystemProperty* sp = system_properties();
1300 while (sp != NULL) {
1301 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1302 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1303 if (i < info_idx) {
1304 vm_exit_during_initialization(
1305 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1306 } else {
1307 if (PrintSharedSpaces) {
1308 tty->print_cr(
1309 "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1310 }
1311 }
1312 }
1313 }
1314 sp = sp->next();
1315 }
1316
1317 // Check for an exploded module build in use with -Xshare:dump.
1318 if (!has_jimage()) {
1319 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1320 }
1321 }
1322 #endif
1323
1324 //===========================================================================================================
1325 // Setting int/mixed/comp mode flags
1326
1327 void Arguments::set_mode_flags(Mode mode) {
1328 // Set up default values for all flags.
1329 // If you add a flag to any of the branches below,
1330 // add a default value for it here.
1331 set_java_compiler(false);
1332 _mode = mode;
1333
1334 // Ensure Agent_OnLoad has the correct initial values.
1335 // This may not be the final mode; mode may change later in onload phase.
1336 PropertyList_unique_add(&_system_properties, "java.vm.info",
1337 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1338
1339 UseInterpreter = true;
1340 UseCompiler = true;
1341 UseLoopCounter = true;
1342
1343 // Default values may be platform/compiler dependent -
1344 // use the saved values
1345 ClipInlining = Arguments::_ClipInlining;
1346 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1347 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1348 BackgroundCompilation = Arguments::_BackgroundCompilation;
1349 if (TieredCompilation) {
1350 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1351 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1352 }
1353 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1354 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1355 }
1356 }
1357
1358 // Change from defaults based on mode
1359 switch (mode) {
1360 default:
1361 ShouldNotReachHere();
1362 break;
1363 case _int:
1364 UseCompiler = false;
1365 UseLoopCounter = false;
1366 AlwaysCompileLoopMethods = false;
1367 UseOnStackReplacement = false;
1368 break;
1369 case _mixed:
1370 // same as default
1371 break;
1372 case _comp:
1373 UseInterpreter = false;
1374 BackgroundCompilation = false;
1375 ClipInlining = false;
1376 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1377 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1378 // compile a level 4 (C2) and then continue executing it.
1379 if (TieredCompilation) {
1380 Tier3InvokeNotifyFreqLog = 0;
1381 Tier4InvocationThreshold = 0;
1382 }
1383 break;
1384 }
1385 }
1386
1387 // Conflict: required to use shared spaces (-Xshare:on), but
1388 // incompatible command line options were chosen.
1389 static void no_shared_spaces(const char* message) {
1390 if (RequireSharedSpaces) {
1391 jio_fprintf(defaultStream::error_stream(),
1392 "Class data sharing is inconsistent with other specified options.\n");
1393 vm_exit_during_initialization("Unable to use shared archive.", message);
1394 } else {
1395 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1396 }
1397 }
1398
1399 // Returns threshold scaled with the value of scale.
1400 // If scale < 0.0, threshold is returned without scaling.
1401 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1402 if (scale == 1.0 || scale < 0.0) {
1403 return threshold;
1404 } else {
1405 return (intx)(threshold * scale);
1406 }
1407 }
1408
1409 // Returns freq_log scaled with the value of scale.
1410 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1411 // If scale < 0.0, freq_log is returned without scaling.
1412 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1413 // Check if scaling is necessary or if negative value was specified.
1414 if (scale == 1.0 || scale < 0.0) {
1415 return freq_log;
1416 }
1417 // Check values to avoid calculating log2 of 0.
1418 if (scale == 0.0 || freq_log == 0) {
1419 return 0;
1420 }
1421 // Determine the maximum notification frequency value currently supported.
1422 // The largest mask value that the interpreter/C1 can handle is
1423 // of length InvocationCounter::number_of_count_bits. Mask values are always
1424 // one bit shorter then the value of the notification frequency. Set
1425 // max_freq_bits accordingly.
1426 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1427 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1428 if (scaled_freq == 0) {
1429 // Return 0 right away to avoid calculating log2 of 0.
1430 return 0;
1431 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1432 return max_freq_bits;
1433 } else {
1434 return log2_intptr(scaled_freq);
1435 }
1436 }
1437
1438 void Arguments::set_tiered_flags() {
1439 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1440 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1441 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1442 }
1443 if (CompilationPolicyChoice < 2) {
1444 vm_exit_during_initialization(
1445 "Incompatible compilation policy selected", NULL);
1446 }
1447 // Increase the code cache size - tiered compiles a lot more.
1448 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1449 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1450 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1451 }
1452 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1453 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1454 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1455 }
1456 if (!UseInterpreter) { // -Xcomp
1457 Tier3InvokeNotifyFreqLog = 0;
1458 Tier4InvocationThreshold = 0;
1459 }
1460
1461 if (CompileThresholdScaling < 0) {
1462 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1463 }
1464
1465 // Scale tiered compilation thresholds.
1466 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1467 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1468 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1469 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1470
1471 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1472 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1473 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1474 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1475
1476 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1477 // once these thresholds become supported.
1478
1479 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1480 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1481
1482 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1483 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1484
1485 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1486
1487 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1488 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1489 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1490 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1491 }
1492 }
1493
1494 #if INCLUDE_ALL_GCS
1495 static void disable_adaptive_size_policy(const char* collector_name) {
1496 if (UseAdaptiveSizePolicy) {
1497 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1498 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1499 collector_name);
1500 }
1501 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1502 }
1503 }
1504
1505 void Arguments::set_parnew_gc_flags() {
1506 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1507 "control point invariant");
1508 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1509
1510 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1511 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1512 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1513 } else if (ParallelGCThreads == 0) {
1514 jio_fprintf(defaultStream::error_stream(),
1515 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1516 vm_exit(1);
1517 }
1518
1519 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1520 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1521 // we set them to 1024 and 1024.
1522 // See CR 6362902.
1523 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1524 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1525 }
1526 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1527 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1528 }
1529
1530 // When using compressed oops, we use local overflow stacks,
1531 // rather than using a global overflow list chained through
1532 // the klass word of the object's pre-image.
1533 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1534 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1535 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1536 }
1537 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1538 }
1539 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1540 }
1541
1542 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1543 // sparc/solaris for certain applications, but would gain from
1544 // further optimization and tuning efforts, and would almost
1545 // certainly gain from analysis of platform and environment.
1546 void Arguments::set_cms_and_parnew_gc_flags() {
1547 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1548 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1549
1550 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1551 disable_adaptive_size_policy("UseConcMarkSweepGC");
1552
1553 set_parnew_gc_flags();
1554
1555 size_t max_heap = align_size_down(MaxHeapSize,
1556 CardTableRS::ct_max_alignment_constraint());
1557
1558 // Now make adjustments for CMS
1559 intx tenuring_default = (intx)6;
1560 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1561
1562 // Preferred young gen size for "short" pauses:
1563 // upper bound depends on # of threads and NewRatio.
1564 const size_t preferred_max_new_size_unaligned =
1565 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1566 size_t preferred_max_new_size =
1567 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1568
1569 // Unless explicitly requested otherwise, size young gen
1570 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1571
1572 // If either MaxNewSize or NewRatio is set on the command line,
1573 // assume the user is trying to set the size of the young gen.
1574 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1575
1576 // Set MaxNewSize to our calculated preferred_max_new_size unless
1577 // NewSize was set on the command line and it is larger than
1578 // preferred_max_new_size.
1579 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1580 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1581 } else {
1582 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1583 }
1584 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1585
1586 // Code along this path potentially sets NewSize and OldSize
1587 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1588 min_heap_size(), InitialHeapSize, max_heap);
1589 size_t min_new = preferred_max_new_size;
1590 if (FLAG_IS_CMDLINE(NewSize)) {
1591 min_new = NewSize;
1592 }
1593 if (max_heap > min_new && min_heap_size() > min_new) {
1594 // Unless explicitly requested otherwise, make young gen
1595 // at least min_new, and at most preferred_max_new_size.
1596 if (FLAG_IS_DEFAULT(NewSize)) {
1597 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1598 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1599 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1600 }
1601 // Unless explicitly requested otherwise, size old gen
1602 // so it's NewRatio x of NewSize.
1603 if (FLAG_IS_DEFAULT(OldSize)) {
1604 if (max_heap > NewSize) {
1605 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1606 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1607 }
1608 }
1609 }
1610 }
1611 // Unless explicitly requested otherwise, definitely
1612 // promote all objects surviving "tenuring_default" scavenges.
1613 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1614 FLAG_IS_DEFAULT(SurvivorRatio)) {
1615 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1616 }
1617 // If we decided above (or user explicitly requested)
1618 // `promote all' (via MaxTenuringThreshold := 0),
1619 // prefer minuscule survivor spaces so as not to waste
1620 // space for (non-existent) survivors
1621 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1622 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1623 }
1624
1625 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1626 // but rather the number of free blocks of a given size that are used when
1627 // replenishing the local per-worker free list caches.
1628 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1629 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1630 // OldPLAB sizing manually turned off: Use a larger default setting,
1631 // unless it was manually specified. This is because a too-low value
1632 // will slow down scavenges.
1633 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1634 } else {
1635 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1636 }
1637 }
1638
1639 // If either of the static initialization defaults have changed, note this
1640 // modification.
1641 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1642 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1643 }
1644
1645 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1646 }
1647 #endif // INCLUDE_ALL_GCS
1648
1649 void set_object_alignment() {
1650 // Object alignment.
1651 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1652 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1653 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1654 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1655 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1656 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1657
1658 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1659 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1660
1661 // Oop encoding heap max
1662 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1663
1664 if (SurvivorAlignmentInBytes == 0) {
1665 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1666 }
1667
1668 #if INCLUDE_ALL_GCS
1669 // Set CMS global values
1670 CompactibleFreeListSpace::set_cms_values();
1671 #endif // INCLUDE_ALL_GCS
1672 }
1673
1674 size_t Arguments::max_heap_for_compressed_oops() {
1675 // Avoid sign flip.
1676 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1677 // We need to fit both the NULL page and the heap into the memory budget, while
1678 // keeping alignment constraints of the heap. To guarantee the latter, as the
1679 // NULL page is located before the heap, we pad the NULL page to the conservative
1680 // maximum alignment that the GC may ever impose upon the heap.
1681 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1682 _conservative_max_heap_alignment);
1683
1684 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1685 NOT_LP64(ShouldNotReachHere(); return 0);
1686 }
1687
1688 void Arguments::set_use_compressed_oops() {
1689 #ifndef ZERO
1690 #ifdef _LP64
1691 // MaxHeapSize is not set up properly at this point, but
1692 // the only value that can override MaxHeapSize if we are
1693 // to use UseCompressedOops is InitialHeapSize.
1694 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1695
1696 if (max_heap_size <= max_heap_for_compressed_oops()) {
1697 #if !defined(COMPILER1) || defined(TIERED)
1698 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1699 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1700 }
1701 #endif
1702 } else {
1703 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1704 warning("Max heap size too large for Compressed Oops");
1705 FLAG_SET_DEFAULT(UseCompressedOops, false);
1706 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1707 }
1708 }
1709 #endif // _LP64
1710 #endif // ZERO
1711 }
1712
1713
1714 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1715 // set_use_compressed_oops().
1716 void Arguments::set_use_compressed_klass_ptrs() {
1717 #ifndef ZERO
1718 #ifdef _LP64
1719 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1720 if (!UseCompressedOops) {
1721 if (UseCompressedClassPointers) {
1722 warning("UseCompressedClassPointers requires UseCompressedOops");
1723 }
1724 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1725 } else {
1726 // Turn on UseCompressedClassPointers too
1727 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1728 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1729 }
1730 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1731 if (UseCompressedClassPointers) {
1732 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1733 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1734 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1735 }
1736 }
1737 }
1738 #endif // _LP64
1739 #endif // !ZERO
1740 }
1741
1742 void Arguments::set_conservative_max_heap_alignment() {
1743 // The conservative maximum required alignment for the heap is the maximum of
1744 // the alignments imposed by several sources: any requirements from the heap
1745 // itself, the collector policy and the maximum page size we may run the VM
1746 // with.
1747 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1748 #if INCLUDE_ALL_GCS
1749 if (UseParallelGC) {
1750 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1751 } else if (UseG1GC) {
1752 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1753 }
1754 #endif // INCLUDE_ALL_GCS
1755 _conservative_max_heap_alignment = MAX4(heap_alignment,
1756 (size_t)os::vm_allocation_granularity(),
1757 os::max_page_size(),
1758 CollectorPolicy::compute_heap_alignment());
1759 }
1760
1761 bool Arguments::gc_selected() {
1762 #if INCLUDE_ALL_GCS
1763 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC || UseEpsilonGC;
1764 #else
1765 return UseSerialGC;
1766 #endif // INCLUDE_ALL_GCS
1767 }
1768
1769 void Arguments::select_gc_ergonomically() {
1770 #if INCLUDE_ALL_GCS
1771 if (os::is_server_class_machine()) {
1772 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1773 } else {
1774 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1775 }
1776 #else
1777 UNSUPPORTED_OPTION(UseG1GC);
1778 UNSUPPORTED_OPTION(UseParallelGC);
1779 UNSUPPORTED_OPTION(UseParallelOldGC);
1780 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1781 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1782 #endif // INCLUDE_ALL_GCS
1783 }
1784
1785 void Arguments::select_gc() {
1786 if (!gc_selected()) {
1787 select_gc_ergonomically();
1788 if (!gc_selected()) {
1789 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1790 }
1791 }
1792 }
1793
1794 void Arguments::set_ergonomics_flags() {
1795 select_gc();
1796
1797 #if defined(COMPILER2) || INCLUDE_JVMCI
1798 // Shared spaces work fine with other GCs but causes bytecode rewriting
1799 // to be disabled, which hurts interpreter performance and decreases
1800 // server performance. When -server is specified, keep the default off
1801 // unless it is asked for. Future work: either add bytecode rewriting
1802 // at link time, or rewrite bytecodes in non-shared methods.
1803 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1804 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1805 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1806 }
1807 #endif
1808
1809 set_conservative_max_heap_alignment();
1810
1811 #ifndef ZERO
1812 #ifdef _LP64
1813 set_use_compressed_oops();
1814
1815 // set_use_compressed_klass_ptrs() must be called after calling
1816 // set_use_compressed_oops().
1817 set_use_compressed_klass_ptrs();
1818
1819 // Also checks that certain machines are slower with compressed oops
1820 // in vm_version initialization code.
1821 #endif // _LP64
1822 #endif // !ZERO
1823
1824 }
1825
1826 void Arguments::set_parallel_gc_flags() {
1827 assert(UseParallelGC || UseParallelOldGC, "Error");
1828 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1829 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1830 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1831 }
1832 FLAG_SET_DEFAULT(UseParallelGC, true);
1833
1834 // If no heap maximum was requested explicitly, use some reasonable fraction
1835 // of the physical memory, up to a maximum of 1GB.
1836 FLAG_SET_DEFAULT(ParallelGCThreads,
1837 Abstract_VM_Version::parallel_worker_threads());
1838 if (ParallelGCThreads == 0) {
1839 jio_fprintf(defaultStream::error_stream(),
1840 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1841 vm_exit(1);
1842 }
1843
1844 if (UseAdaptiveSizePolicy) {
1845 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1846 // unless the user actually sets these flags.
1847 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1848 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1849 }
1850 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1851 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1852 }
1853 }
1854
1855 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1856 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1857 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1858 // See CR 6362902 for details.
1859 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1860 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1861 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1862 }
1863 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1864 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1865 }
1866 }
1867
1868 if (UseParallelOldGC) {
1869 // Par compact uses lower default values since they are treated as
1870 // minimums. These are different defaults because of the different
1871 // interpretation and are not ergonomically set.
1872 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1873 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1874 }
1875 }
1876 }
1877
1878 void Arguments::set_g1_gc_flags() {
1879 assert(UseG1GC, "Error");
1880 #if defined(COMPILER1) || INCLUDE_JVMCI
1881 FastTLABRefill = false;
1882 #endif
1883 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1884 if (ParallelGCThreads == 0) {
1885 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1886 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1887 }
1888
1889 #if INCLUDE_ALL_GCS
1890 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1891 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1892 }
1893 #endif
1894
1895 // MarkStackSize will be set (if it hasn't been set by the user)
1896 // when concurrent marking is initialized.
1897 // Its value will be based upon the number of parallel marking threads.
1898 // But we do set the maximum mark stack size here.
1899 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1900 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1901 }
1902
1903 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1904 // In G1, we want the default GC overhead goal to be higher than
1905 // it is for PS, or the heap might be expanded too aggressively.
1906 // We set it here to ~8%.
1907 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1908 }
1909
1910 // Below, we might need to calculate the pause time interval based on
1911 // the pause target. When we do so we are going to give G1 maximum
1912 // flexibility and allow it to do pauses when it needs to. So, we'll
1913 // arrange that the pause interval to be pause time target + 1 to
1914 // ensure that a) the pause time target is maximized with respect to
1915 // the pause interval and b) we maintain the invariant that pause
1916 // time target < pause interval. If the user does not want this
1917 // maximum flexibility, they will have to set the pause interval
1918 // explicitly.
1919
1920 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1921 // The default pause time target in G1 is 200ms
1922 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1923 }
1924
1925 // Then, if the interval parameter was not set, set it according to
1926 // the pause time target (this will also deal with the case when the
1927 // pause time target is the default value).
1928 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1929 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1930 }
1931
1932 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1933 }
1934
1935 void Arguments::set_gc_specific_flags() {
1936 #if INCLUDE_ALL_GCS
1937 // Set per-collector flags
1938 if (UseParallelGC || UseParallelOldGC) {
1939 set_parallel_gc_flags();
1940 } else if (UseConcMarkSweepGC) {
1941 set_cms_and_parnew_gc_flags();
1942 } else if (UseG1GC) {
1943 set_g1_gc_flags();
1944 }
1945 if (AssumeMP && !UseSerialGC) {
1946 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1947 warning("If the number of processors is expected to increase from one, then"
1948 " you should configure the number of parallel GC threads appropriately"
1949 " using -XX:ParallelGCThreads=N");
1950 }
1951 }
1952 if (MinHeapFreeRatio == 100) {
1953 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1954 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1955 }
1956
1957 // If class unloading is disabled, also disable concurrent class unloading.
1958 if (!ClassUnloading) {
1959 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1960 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1961 }
1962 #endif // INCLUDE_ALL_GCS
1963 }
1964
1965 julong Arguments::limit_by_allocatable_memory(julong limit) {
1966 julong max_allocatable;
1967 julong result = limit;
1968 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1969 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1970 }
1971 return result;
1972 }
1973
1974 // Use static initialization to get the default before parsing
1975 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1976
1977 void Arguments::set_heap_size() {
1978 julong phys_mem =
1979 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1980 : (julong)MaxRAM;
1981
1982 // Experimental support for CGroup memory limits
1983 if (UseCGroupMemoryLimitForHeap) {
1984 // This is a rough indicator that a CGroup limit may be in force
1985 // for this process
1986 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1987 FILE *fp = fopen(lim_file, "r");
1988 if (fp != NULL) {
1989 julong cgroup_max = 0;
1990 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1991 if (ret == 1 && cgroup_max > 0) {
1992 // If unlimited, cgroup_max will be a very large, but unspecified
1993 // value, so use initial phys_mem as a limit
1994 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
1995 JULONG_FORMAT "MB) and initial phys_mem ("
1996 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1997 phys_mem = MIN2(cgroup_max, phys_mem);
1998 } else {
1999 warning("Unable to read/parse cgroup memory limit from %s: %s",
2000 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2001 }
2002 fclose(fp);
2003 } else {
2004 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2005 }
2006 }
2007
2008 // If the maximum heap size has not been set with -Xmx,
2009 // then set it as fraction of the size of physical memory,
2010 // respecting the maximum and minimum sizes of the heap.
2011 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2012 julong reasonable_max = phys_mem / MaxRAMFraction;
2013
2014 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2015 // Small physical memory, so use a minimum fraction of it for the heap
2016 reasonable_max = phys_mem / MinRAMFraction;
2017 } else {
2018 // Not-small physical memory, so require a heap at least
2019 // as large as MaxHeapSize
2020 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2021 }
2022 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2023 // Limit the heap size to ErgoHeapSizeLimit
2024 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2025 }
2026 if (UseCompressedOops) {
2027 // Limit the heap size to the maximum possible when using compressed oops
2028 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2029
2030 // HeapBaseMinAddress can be greater than default but not less than.
2031 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2032 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2033 // matches compressed oops printing flags
2034 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2035 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2036 DefaultHeapBaseMinAddress,
2037 DefaultHeapBaseMinAddress/G,
2038 HeapBaseMinAddress);
2039 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2040 }
2041 }
2042
2043 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2044 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2045 // but it should be not less than default MaxHeapSize.
2046 max_coop_heap -= HeapBaseMinAddress;
2047 }
2048 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2049 }
2050 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2051
2052 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2053 // An initial heap size was specified on the command line,
2054 // so be sure that the maximum size is consistent. Done
2055 // after call to limit_by_allocatable_memory because that
2056 // method might reduce the allocation size.
2057 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2058 }
2059
2060 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2061 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2062 }
2063
2064 // If the minimum or initial heap_size have not been set or requested to be set
2065 // ergonomically, set them accordingly.
2066 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2067 julong reasonable_minimum = (julong)(OldSize + NewSize);
2068
2069 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2070
2071 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2072
2073 if (InitialHeapSize == 0) {
2074 julong reasonable_initial = phys_mem / InitialRAMFraction;
2075
2076 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2077 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2078
2079 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2080
2081 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2082 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2083 }
2084 // If the minimum heap size has not been set (via -Xms),
2085 // synchronize with InitialHeapSize to avoid errors with the default value.
2086 if (min_heap_size() == 0) {
2087 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2088 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2089 }
2090 }
2091 }
2092
2093 // This option inspects the machine and attempts to set various
2094 // parameters to be optimal for long-running, memory allocation
2095 // intensive jobs. It is intended for machines with large
2096 // amounts of cpu and memory.
2097 jint Arguments::set_aggressive_heap_flags() {
2098 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2099 // VM, but we may not be able to represent the total physical memory
2100 // available (like having 8gb of memory on a box but using a 32bit VM).
2101 // Thus, we need to make sure we're using a julong for intermediate
2102 // calculations.
2103 julong initHeapSize;
2104 julong total_memory = os::physical_memory();
2105
2106 if (total_memory < (julong) 256 * M) {
2107 jio_fprintf(defaultStream::error_stream(),
2108 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2109 vm_exit(1);
2110 }
2111
2112 // The heap size is half of available memory, or (at most)
2113 // all of possible memory less 160mb (leaving room for the OS
2114 // when using ISM). This is the maximum; because adaptive sizing
2115 // is turned on below, the actual space used may be smaller.
2116
2117 initHeapSize = MIN2(total_memory / (julong) 2,
2118 total_memory - (julong) 160 * M);
2119
2120 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2121
2122 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2123 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2124 return JNI_EINVAL;
2125 }
2126 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2127 return JNI_EINVAL;
2128 }
2129 // Currently the minimum size and the initial heap sizes are the same.
2130 set_min_heap_size(initHeapSize);
2131 }
2132 if (FLAG_IS_DEFAULT(NewSize)) {
2133 // Make the young generation 3/8ths of the total heap.
2134 if (FLAG_SET_CMDLINE(size_t, NewSize,
2135 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2136 return JNI_EINVAL;
2137 }
2138 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2139 return JNI_EINVAL;
2140 }
2141 }
2142
2143 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2144 FLAG_SET_DEFAULT(UseLargePages, true);
2145 #endif
2146
2147 // Increase some data structure sizes for efficiency
2148 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2149 return JNI_EINVAL;
2150 }
2151 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2152 return JNI_EINVAL;
2153 }
2154 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2155 return JNI_EINVAL;
2156 }
2157
2158 // See the OldPLABSize comment below, but replace 'after promotion'
2159 // with 'after copying'. YoungPLABSize is the size of the survivor
2160 // space per-gc-thread buffers. The default is 4kw.
2161 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2162 return JNI_EINVAL;
2163 }
2164
2165 // OldPLABSize is the size of the buffers in the old gen that
2166 // UseParallelGC uses to promote live data that doesn't fit in the
2167 // survivor spaces. At any given time, there's one for each gc thread.
2168 // The default size is 1kw. These buffers are rarely used, since the
2169 // survivor spaces are usually big enough. For specjbb, however, there
2170 // are occasions when there's lots of live data in the young gen
2171 // and we end up promoting some of it. We don't have a definite
2172 // explanation for why bumping OldPLABSize helps, but the theory
2173 // is that a bigger PLAB results in retaining something like the
2174 // original allocation order after promotion, which improves mutator
2175 // locality. A minor effect may be that larger PLABs reduce the
2176 // number of PLAB allocation events during gc. The value of 8kw
2177 // was arrived at by experimenting with specjbb.
2178 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2179 return JNI_EINVAL;
2180 }
2181
2182 // Enable parallel GC and adaptive generation sizing
2183 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2184 return JNI_EINVAL;
2185 }
2186 FLAG_SET_DEFAULT(ParallelGCThreads,
2187 Abstract_VM_Version::parallel_worker_threads());
2188
2189 // Encourage steady state memory management
2190 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2191 return JNI_EINVAL;
2192 }
2193
2194 // This appears to improve mutator locality
2195 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2196 return JNI_EINVAL;
2197 }
2198
2199 // Get around early Solaris scheduling bug
2200 // (affinity vs other jobs on system)
2201 // but disallow DR and offlining (5008695).
2202 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2203 return JNI_EINVAL;
2204 }
2205
2206 return JNI_OK;
2207 }
2208
2209 // This must be called after ergonomics.
2210 void Arguments::set_bytecode_flags() {
2211 if (!RewriteBytecodes) {
2212 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2213 }
2214 }
2215
2216 // Aggressive optimization flags -XX:+AggressiveOpts
2217 jint Arguments::set_aggressive_opts_flags() {
2218 #ifdef COMPILER2
2219 if (AggressiveUnboxing) {
2220 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2221 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2222 } else if (!EliminateAutoBox) {
2223 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2224 AggressiveUnboxing = false;
2225 }
2226 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2227 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2228 } else if (!DoEscapeAnalysis) {
2229 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2230 AggressiveUnboxing = false;
2231 }
2232 }
2233 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2234 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2235 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2236 }
2237 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2238 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2239 }
2240
2241 // Feed the cache size setting into the JDK
2242 char buffer[1024];
2243 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2244 if (!add_property(buffer)) {
2245 return JNI_ENOMEM;
2246 }
2247 }
2248 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2249 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2250 }
2251 #endif
2252
2253 if (AggressiveOpts) {
2254 // Sample flag setting code
2255 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2256 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2257 // }
2258 }
2259
2260 return JNI_OK;
2261 }
2262
2263 //===========================================================================================================
2264 // Parsing of java.compiler property
2265
2266 void Arguments::process_java_compiler_argument(const char* arg) {
2267 // For backwards compatibility, Djava.compiler=NONE or ""
2268 // causes us to switch to -Xint mode UNLESS -Xdebug
2269 // is also specified.
2270 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2271 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2272 }
2273 }
2274
2275 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2276 _sun_java_launcher = os::strdup_check_oom(launcher);
2277 }
2278
2279 bool Arguments::created_by_java_launcher() {
2280 assert(_sun_java_launcher != NULL, "property must have value");
2281 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2282 }
2283
2284 bool Arguments::sun_java_launcher_is_altjvm() {
2285 return _sun_java_launcher_is_altjvm;
2286 }
2287
2288 //===========================================================================================================
2289 // Parsing of main arguments
2290
2291 #if INCLUDE_JVMCI
2292 // Check consistency of jvmci vm argument settings.
2293 bool Arguments::check_jvmci_args_consistency() {
2294 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2295 }
2296 #endif //INCLUDE_JVMCI
2297
2298 // Check consistency of GC selection
2299 bool Arguments::check_gc_consistency() {
2300 // Ensure that the user has not selected conflicting sets
2301 // of collectors.
2302 uint i = 0;
2303 if (UseSerialGC) i++;
2304 if (UseConcMarkSweepGC) i++;
2305 if (UseParallelGC || UseParallelOldGC) i++;
2306 if (UseG1GC) i++;
2307 if (UseEpsilonGC) i++;
2308 if (i > 1) {
2309 jio_fprintf(defaultStream::error_stream(),
2310 "Conflicting collector combinations in option list; "
2311 "please refer to the release notes for the combinations "
2312 "allowed\n");
2313 return false;
2314 }
2315
2316 return true;
2317 }
2318
2319 // Check the consistency of vm_init_args
2320 bool Arguments::check_vm_args_consistency() {
2321 // Method for adding checks for flag consistency.
2322 // The intent is to warn the user of all possible conflicts,
2323 // before returning an error.
2324 // Note: Needs platform-dependent factoring.
2325 bool status = true;
2326
2327 if (TLABRefillWasteFraction == 0) {
2328 jio_fprintf(defaultStream::error_stream(),
2329 "TLABRefillWasteFraction should be a denominator, "
2330 "not " SIZE_FORMAT "\n",
2331 TLABRefillWasteFraction);
2332 status = false;
2333 }
2334
2335 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2336 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2337 }
2338
2339 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2340 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2341 }
2342
2343 if (GCTimeLimit == 100) {
2344 // Turn off gc-overhead-limit-exceeded checks
2345 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2346 }
2347
2348 status = status && check_gc_consistency();
2349
2350 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2351 // insists that we hold the requisite locks so that the iteration is
2352 // MT-safe. For the verification at start-up and shut-down, we don't
2353 // yet have a good way of acquiring and releasing these locks,
2354 // which are not visible at the CollectedHeap level. We want to
2355 // be able to acquire these locks and then do the iteration rather
2356 // than just disable the lock verification. This will be fixed under
2357 // bug 4788986.
2358 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2359 if (VerifyDuringStartup) {
2360 warning("Heap verification at start-up disabled "
2361 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2362 VerifyDuringStartup = false; // Disable verification at start-up
2363 }
2364
2365 if (VerifyBeforeExit) {
2366 warning("Heap verification at shutdown disabled "
2367 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2368 VerifyBeforeExit = false; // Disable verification at shutdown
2369 }
2370 }
2371
2372 if (PrintNMTStatistics) {
2373 #if INCLUDE_NMT
2374 if (MemTracker::tracking_level() == NMT_off) {
2375 #endif // INCLUDE_NMT
2376 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2377 PrintNMTStatistics = false;
2378 #if INCLUDE_NMT
2379 }
2380 #endif
2381 }
2382 #if INCLUDE_JVMCI
2383
2384 status = status && check_jvmci_args_consistency();
2385
2386 if (EnableJVMCI) {
2387 if (!ScavengeRootsInCode) {
2388 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2389 ScavengeRootsInCode = 1;
2390 }
2391 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2392 TypeProfileLevel = 0;
2393 }
2394 if (UseJVMCICompiler) {
2395 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2396 TypeProfileWidth = 8;
2397 }
2398 }
2399 }
2400 #endif
2401
2402 // Check lower bounds of the code cache
2403 // Template Interpreter code is approximately 3X larger in debug builds.
2404 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2405 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2406 jio_fprintf(defaultStream::error_stream(),
2407 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2408 os::vm_page_size()/K);
2409 status = false;
2410 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2411 jio_fprintf(defaultStream::error_stream(),
2412 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2413 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2414 status = false;
2415 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2416 jio_fprintf(defaultStream::error_stream(),
2417 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2418 min_code_cache_size/K);
2419 status = false;
2420 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2421 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2422 jio_fprintf(defaultStream::error_stream(),
2423 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2424 CODE_CACHE_SIZE_LIMIT/M);
2425 status = false;
2426 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2427 jio_fprintf(defaultStream::error_stream(),
2428 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2429 min_code_cache_size/K);
2430 status = false;
2431 }
2432
2433 #ifdef _LP64
2434 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2435 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2436 }
2437 #endif
2438
2439 #ifndef SUPPORT_RESERVED_STACK_AREA
2440 if (StackReservedPages != 0) {
2441 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2442 warning("Reserved Stack Area not supported on this platform");
2443 }
2444 #endif
2445
2446 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2447 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2448 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2449 }
2450 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2451 }
2452 if (UseCompiler && is_interpreter_only()) {
2453 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2454 warning("UseCompiler disabled due to -Xint.");
2455 }
2456 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2457 }
2458 #ifdef COMPILER2
2459 if (PostLoopMultiversioning && !RangeCheckElimination) {
2460 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2461 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2462 }
2463 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2464 }
2465 #endif
2466 return status;
2467 }
2468
2469 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2470 const char* option_type) {
2471 if (ignore) return false;
2472
2473 const char* spacer = " ";
2474 if (option_type == NULL) {
2475 option_type = ++spacer; // Set both to the empty string.
2476 }
2477
2478 if (os::obsolete_option(option)) {
2479 jio_fprintf(defaultStream::error_stream(),
2480 "Obsolete %s%soption: %s\n", option_type, spacer,
2481 option->optionString);
2482 return false;
2483 } else {
2484 jio_fprintf(defaultStream::error_stream(),
2485 "Unrecognized %s%soption: %s\n", option_type, spacer,
2486 option->optionString);
2487 return true;
2488 }
2489 }
2490
2491 static const char* user_assertion_options[] = {
2492 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2493 };
2494
2495 static const char* system_assertion_options[] = {
2496 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2497 };
2498
2499 bool Arguments::parse_uintx(const char* value,
2500 uintx* uintx_arg,
2501 uintx min_size) {
2502
2503 // Check the sign first since atojulong() parses only unsigned values.
2504 bool value_is_positive = !(*value == '-');
2505
2506 if (value_is_positive) {
2507 julong n;
2508 bool good_return = atojulong(value, &n);
2509 if (good_return) {
2510 bool above_minimum = n >= min_size;
2511 bool value_is_too_large = n > max_uintx;
2512
2513 if (above_minimum && !value_is_too_large) {
2514 *uintx_arg = n;
2515 return true;
2516 }
2517 }
2518 }
2519 return false;
2520 }
2521
2522 unsigned int addreads_count = 0;
2523 unsigned int addexports_count = 0;
2524 unsigned int addopens_count = 0;
2525 unsigned int addmods_count = 0;
2526 unsigned int patch_mod_count = 0;
2527
2528 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2529 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2530 char* property = AllocateHeap(prop_len, mtArguments);
2531 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2532 if (ret < 0 || ret >= (int)prop_len) {
2533 FreeHeap(property);
2534 return false;
2535 }
2536 bool added = add_property(property, UnwriteableProperty, internal);
2537 FreeHeap(property);
2538 return added;
2539 }
2540
2541 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2542 // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2543 if (count < 1000) {
2544 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2545 char* property = AllocateHeap(prop_len, mtArguments);
2546 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2547 if (ret < 0 || ret >= (int)prop_len) {
2548 FreeHeap(property);
2549 return false;
2550 }
2551 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2552 FreeHeap(property);
2553 return added;
2554 }
2555 return false;
2556 }
2557
2558 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2559 julong* long_arg,
2560 julong min_size) {
2561 if (!atojulong(s, long_arg)) return arg_unreadable;
2562 return check_memory_size(*long_arg, min_size);
2563 }
2564
2565 // Parse JavaVMInitArgs structure
2566
2567 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2568 const JavaVMInitArgs *java_options_args,
2569 const JavaVMInitArgs *cmd_line_args) {
2570 bool patch_mod_javabase = false;
2571
2572 // Save default settings for some mode flags
2573 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2574 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2575 Arguments::_ClipInlining = ClipInlining;
2576 Arguments::_BackgroundCompilation = BackgroundCompilation;
2577 if (TieredCompilation) {
2578 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2579 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2580 }
2581
2582 // Setup flags for mixed which is the default
2583 set_mode_flags(_mixed);
2584
2585 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2586 // variable (if present).
2587 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2588 if (result != JNI_OK) {
2589 return result;
2590 }
2591
2592 // Parse args structure generated from the command line flags.
2593 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2594 if (result != JNI_OK) {
2595 return result;
2596 }
2597
2598 // Parse args structure generated from the _JAVA_OPTIONS environment
2599 // variable (if present) (mimics classic VM)
2600 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2601 if (result != JNI_OK) {
2602 return result;
2603 }
2604
2605 // Do final processing now that all arguments have been parsed
2606 result = finalize_vm_init_args();
2607 if (result != JNI_OK) {
2608 return result;
2609 }
2610
2611 #if INCLUDE_CDS
2612 if (UseSharedSpaces && patch_mod_javabase) {
2613 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2614 }
2615 #endif
2616
2617 return JNI_OK;
2618 }
2619
2620 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2621 // represents a valid JDWP agent. is_path==true denotes that we
2622 // are dealing with -agentpath (case where name is a path), otherwise with
2623 // -agentlib
2624 bool valid_jdwp_agent(char *name, bool is_path) {
2625 char *_name;
2626 const char *_jdwp = "jdwp";
2627 size_t _len_jdwp, _len_prefix;
2628
2629 if (is_path) {
2630 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2631 return false;
2632 }
2633
2634 _name++; // skip past last path separator
2635 _len_prefix = strlen(JNI_LIB_PREFIX);
2636
2637 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2638 return false;
2639 }
2640
2641 _name += _len_prefix;
2642 _len_jdwp = strlen(_jdwp);
2643
2644 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2645 _name += _len_jdwp;
2646 }
2647 else {
2648 return false;
2649 }
2650
2651 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2652 return false;
2653 }
2654
2655 return true;
2656 }
2657
2658 if (strcmp(name, _jdwp) == 0) {
2659 return true;
2660 }
2661
2662 return false;
2663 }
2664
2665 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2666 // --patch-module=<module>=<file>(<pathsep><file>)*
2667 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2668 // Find the equal sign between the module name and the path specification
2669 const char* module_equal = strchr(patch_mod_tail, '=');
2670 if (module_equal == NULL) {
2671 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2672 return JNI_ERR;
2673 } else {
2674 // Pick out the module name
2675 size_t module_len = module_equal - patch_mod_tail;
2676 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2677 if (module_name != NULL) {
2678 memcpy(module_name, patch_mod_tail, module_len);
2679 *(module_name + module_len) = '\0';
2680 // The path piece begins one past the module_equal sign
2681 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2682 FREE_C_HEAP_ARRAY(char, module_name);
2683 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2684 return JNI_ENOMEM;
2685 }
2686 } else {
2687 return JNI_ENOMEM;
2688 }
2689 }
2690 return JNI_OK;
2691 }
2692
2693 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2694 // For match_option to return remaining or value part of option string
2695 const char* tail;
2696
2697 // iterate over arguments
2698 for (int index = 0; index < args->nOptions; index++) {
2699 bool is_absolute_path = false; // for -agentpath vs -agentlib
2700
2701 const JavaVMOption* option = args->options + index;
2702
2703 if (!match_option(option, "-Djava.class.path", &tail) &&
2704 !match_option(option, "-Dsun.java.command", &tail) &&
2705 !match_option(option, "-Dsun.java.launcher", &tail)) {
2706
2707 // add all jvm options to the jvm_args string. This string
2708 // is used later to set the java.vm.args PerfData string constant.
2709 // the -Djava.class.path and the -Dsun.java.command options are
2710 // omitted from jvm_args string as each have their own PerfData
2711 // string constant object.
2712 build_jvm_args(option->optionString);
2713 }
2714
2715 // -verbose:[class/gc/jni]
2716 if (match_option(option, "-verbose", &tail)) {
2717 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2718 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2719 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2720 } else if (!strcmp(tail, ":gc")) {
2721 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2722 } else if (!strcmp(tail, ":jni")) {
2723 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 }
2727 // -da / -ea / -disableassertions / -enableassertions
2728 // These accept an optional class/package name separated by a colon, e.g.,
2729 // -da:java.lang.Thread.
2730 } else if (match_option(option, user_assertion_options, &tail, true)) {
2731 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2732 if (*tail == '\0') {
2733 JavaAssertions::setUserClassDefault(enable);
2734 } else {
2735 assert(*tail == ':', "bogus match by match_option()");
2736 JavaAssertions::addOption(tail + 1, enable);
2737 }
2738 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2739 } else if (match_option(option, system_assertion_options, &tail, false)) {
2740 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2741 JavaAssertions::setSystemClassDefault(enable);
2742 // -bootclasspath:
2743 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2744 jio_fprintf(defaultStream::output_stream(),
2745 "-Xbootclasspath is no longer a supported option.\n");
2746 return JNI_EINVAL;
2747 // -bootclasspath/a:
2748 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2749 Arguments::append_sysclasspath(tail);
2750 // -bootclasspath/p:
2751 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2752 jio_fprintf(defaultStream::output_stream(),
2753 "-Xbootclasspath/p is no longer a supported option.\n");
2754 return JNI_EINVAL;
2755 // -Xrun
2756 } else if (match_option(option, "-Xrun", &tail)) {
2757 if (tail != NULL) {
2758 const char* pos = strchr(tail, ':');
2759 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2760 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2761 jio_snprintf(name, len + 1, "%s", tail);
2762
2763 char *options = NULL;
2764 if(pos != NULL) {
2765 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2766 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2767 }
2768 #if !INCLUDE_JVMTI
2769 if (strcmp(name, "jdwp") == 0) {
2770 jio_fprintf(defaultStream::error_stream(),
2771 "Debugging agents are not supported in this VM\n");
2772 return JNI_ERR;
2773 }
2774 #endif // !INCLUDE_JVMTI
2775 add_init_library(name, options);
2776 }
2777 } else if (match_option(option, "--add-reads=", &tail)) {
2778 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2779 return JNI_ENOMEM;
2780 }
2781 } else if (match_option(option, "--add-exports=", &tail)) {
2782 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2783 return JNI_ENOMEM;
2784 }
2785 } else if (match_option(option, "--add-opens=", &tail)) {
2786 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2787 return JNI_ENOMEM;
2788 }
2789 } else if (match_option(option, "--add-modules=", &tail)) {
2790 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2791 return JNI_ENOMEM;
2792 }
2793 } else if (match_option(option, "--limit-modules=", &tail)) {
2794 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2795 return JNI_ENOMEM;
2796 }
2797 } else if (match_option(option, "--module-path=", &tail)) {
2798 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2799 return JNI_ENOMEM;
2800 }
2801 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2802 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2803 return JNI_ENOMEM;
2804 }
2805 } else if (match_option(option, "--patch-module=", &tail)) {
2806 // --patch-module=<module>=<file>(<pathsep><file>)*
2807 int res = process_patch_mod_option(tail, patch_mod_javabase);
2808 if (res != JNI_OK) {
2809 return res;
2810 }
2811 // -agentlib and -agentpath
2812 } else if (match_option(option, "-agentlib:", &tail) ||
2813 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2814 if(tail != NULL) {
2815 const char* pos = strchr(tail, '=');
2816 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2817 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2818 name[len] = '\0';
2819
2820 char *options = NULL;
2821 if(pos != NULL) {
2822 options = os::strdup_check_oom(pos + 1, mtArguments);
2823 }
2824 #if !INCLUDE_JVMTI
2825 if (valid_jdwp_agent(name, is_absolute_path)) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Debugging agents are not supported in this VM\n");
2828 return JNI_ERR;
2829 }
2830 #endif // !INCLUDE_JVMTI
2831 add_init_agent(name, options, is_absolute_path);
2832 }
2833 // -javaagent
2834 } else if (match_option(option, "-javaagent:", &tail)) {
2835 #if !INCLUDE_JVMTI
2836 jio_fprintf(defaultStream::error_stream(),
2837 "Instrumentation agents are not supported in this VM\n");
2838 return JNI_ERR;
2839 #else
2840 if (tail != NULL) {
2841 size_t length = strlen(tail) + 1;
2842 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2843 jio_snprintf(options, length, "%s", tail);
2844 add_init_agent("instrument", options, false);
2845 // java agents need module java.instrument
2846 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2847 return JNI_ENOMEM;
2848 }
2849 }
2850 #endif // !INCLUDE_JVMTI
2851 // -Xnoclassgc
2852 } else if (match_option(option, "-Xnoclassgc")) {
2853 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 // -Xconcgc
2857 } else if (match_option(option, "-Xconcgc")) {
2858 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2862 // -Xnoconcgc
2863 } else if (match_option(option, "-Xnoconcgc")) {
2864 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2865 return JNI_EINVAL;
2866 }
2867 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2868 // -Xbatch
2869 } else if (match_option(option, "-Xbatch")) {
2870 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2871 return JNI_EINVAL;
2872 }
2873 // -Xmn for compatibility with other JVM vendors
2874 } else if (match_option(option, "-Xmn", &tail)) {
2875 julong long_initial_young_size = 0;
2876 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2877 if (errcode != arg_in_range) {
2878 jio_fprintf(defaultStream::error_stream(),
2879 "Invalid initial young generation size: %s\n", option->optionString);
2880 describe_range_error(errcode);
2881 return JNI_EINVAL;
2882 }
2883 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2884 return JNI_EINVAL;
2885 }
2886 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2887 return JNI_EINVAL;
2888 }
2889 // -Xms
2890 } else if (match_option(option, "-Xms", &tail)) {
2891 julong long_initial_heap_size = 0;
2892 // an initial heap size of 0 means automatically determine
2893 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2894 if (errcode != arg_in_range) {
2895 jio_fprintf(defaultStream::error_stream(),
2896 "Invalid initial heap size: %s\n", option->optionString);
2897 describe_range_error(errcode);
2898 return JNI_EINVAL;
2899 }
2900 set_min_heap_size((size_t)long_initial_heap_size);
2901 // Currently the minimum size and the initial heap sizes are the same.
2902 // Can be overridden with -XX:InitialHeapSize.
2903 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 // -Xmx
2907 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2908 julong long_max_heap_size = 0;
2909 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2910 if (errcode != arg_in_range) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Invalid maximum heap size: %s\n", option->optionString);
2913 describe_range_error(errcode);
2914 return JNI_EINVAL;
2915 }
2916 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 // Xmaxf
2920 } else if (match_option(option, "-Xmaxf", &tail)) {
2921 char* err;
2922 int maxf = (int)(strtod(tail, &err) * 100);
2923 if (*err != '\0' || *tail == '\0') {
2924 jio_fprintf(defaultStream::error_stream(),
2925 "Bad max heap free percentage size: %s\n",
2926 option->optionString);
2927 return JNI_EINVAL;
2928 } else {
2929 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 }
2933 // Xminf
2934 } else if (match_option(option, "-Xminf", &tail)) {
2935 char* err;
2936 int minf = (int)(strtod(tail, &err) * 100);
2937 if (*err != '\0' || *tail == '\0') {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "Bad min heap free percentage size: %s\n",
2940 option->optionString);
2941 return JNI_EINVAL;
2942 } else {
2943 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 }
2947 // -Xss
2948 } else if (match_option(option, "-Xss", &tail)) {
2949 julong long_ThreadStackSize = 0;
2950 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2951 if (errcode != arg_in_range) {
2952 jio_fprintf(defaultStream::error_stream(),
2953 "Invalid thread stack size: %s\n", option->optionString);
2954 describe_range_error(errcode);
2955 return JNI_EINVAL;
2956 }
2957 // Internally track ThreadStackSize in units of 1024 bytes.
2958 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2959 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2963 } else if (match_option(option, "-Xoss", &tail) ||
2964 match_option(option, "-Xsqnopause") ||
2965 match_option(option, "-Xoptimize") ||
2966 match_option(option, "-Xboundthreads") ||
2967 match_option(option, "-Xusealtsigs")) {
2968 // All these options are deprecated in JDK 9 and will be removed in a future release
2969 char version[256];
2970 JDK_Version::jdk(9).to_string(version, sizeof(version));
2971 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2972 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2973 julong long_CodeCacheExpansionSize = 0;
2974 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2975 if (errcode != arg_in_range) {
2976 jio_fprintf(defaultStream::error_stream(),
2977 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2978 os::vm_page_size()/K);
2979 return JNI_EINVAL;
2980 }
2981 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2982 return JNI_EINVAL;
2983 }
2984 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2985 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2986 julong long_ReservedCodeCacheSize = 0;
2987
2988 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2989 if (errcode != arg_in_range) {
2990 jio_fprintf(defaultStream::error_stream(),
2991 "Invalid maximum code cache size: %s.\n", option->optionString);
2992 return JNI_EINVAL;
2993 }
2994 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2995 return JNI_EINVAL;
2996 }
2997 // -XX:NonNMethodCodeHeapSize=
2998 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2999 julong long_NonNMethodCodeHeapSize = 0;
3000
3001 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3002 if (errcode != arg_in_range) {
3003 jio_fprintf(defaultStream::error_stream(),
3004 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3005 return JNI_EINVAL;
3006 }
3007 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 // -XX:ProfiledCodeHeapSize=
3011 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3012 julong long_ProfiledCodeHeapSize = 0;
3013
3014 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3015 if (errcode != arg_in_range) {
3016 jio_fprintf(defaultStream::error_stream(),
3017 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3018 return JNI_EINVAL;
3019 }
3020 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3021 return JNI_EINVAL;
3022 }
3023 // -XX:NonProfiledCodeHeapSizee=
3024 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3025 julong long_NonProfiledCodeHeapSize = 0;
3026
3027 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3028 if (errcode != arg_in_range) {
3029 jio_fprintf(defaultStream::error_stream(),
3030 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3031 return JNI_EINVAL;
3032 }
3033 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3034 return JNI_EINVAL;
3035 }
3036 // -green
3037 } else if (match_option(option, "-green")) {
3038 jio_fprintf(defaultStream::error_stream(),
3039 "Green threads support not available\n");
3040 return JNI_EINVAL;
3041 // -native
3042 } else if (match_option(option, "-native")) {
3043 // HotSpot always uses native threads, ignore silently for compatibility
3044 // -Xrs
3045 } else if (match_option(option, "-Xrs")) {
3046 // Classic/EVM option, new functionality
3047 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 // -Xprof
3051 } else if (match_option(option, "-Xprof")) {
3052 #if INCLUDE_FPROF
3053 _has_profile = true;
3054 #else // INCLUDE_FPROF
3055 jio_fprintf(defaultStream::error_stream(),
3056 "Flat profiling is not supported in this VM.\n");
3057 return JNI_ERR;
3058 #endif // INCLUDE_FPROF
3059 // -Xconcurrentio
3060 } else if (match_option(option, "-Xconcurrentio")) {
3061 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3062 return JNI_EINVAL;
3063 }
3064 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3065 return JNI_EINVAL;
3066 }
3067 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3074 return JNI_EINVAL;
3075 }
3076
3077 // -Xinternalversion
3078 } else if (match_option(option, "-Xinternalversion")) {
3079 jio_fprintf(defaultStream::output_stream(), "%s\n",
3080 VM_Version::internal_vm_info_string());
3081 vm_exit(0);
3082 #ifndef PRODUCT
3083 // -Xprintflags
3084 } else if (match_option(option, "-Xprintflags")) {
3085 CommandLineFlags::printFlags(tty, false);
3086 vm_exit(0);
3087 #endif
3088 // -D
3089 } else if (match_option(option, "-D", &tail)) {
3090 const char* value;
3091 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3092 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3093 // abort if -Djava.endorsed.dirs is set
3094 jio_fprintf(defaultStream::output_stream(),
3095 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3096 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3097 return JNI_EINVAL;
3098 }
3099 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3100 *value != '\0' && strcmp(value, "\"\"") != 0) {
3101 // abort if -Djava.ext.dirs is set
3102 jio_fprintf(defaultStream::output_stream(),
3103 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3104 return JNI_EINVAL;
3105 }
3106 // Check for module related properties. They must be set using the modules
3107 // options. For example: use "--add-modules=java.sql", not
3108 // "-Djdk.module.addmods=java.sql"
3109 if (is_internal_module_property(option->optionString + 2)) {
3110 needs_module_property_warning = true;
3111 continue;
3112 }
3113
3114 if (!add_property(tail)) {
3115 return JNI_ENOMEM;
3116 }
3117 // Out of the box management support
3118 if (match_option(option, "-Dcom.sun.management", &tail)) {
3119 #if INCLUDE_MANAGEMENT
3120 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3121 return JNI_EINVAL;
3122 }
3123 // management agent in module java.management
3124 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) {
3125 return JNI_ENOMEM;
3126 }
3127 #else
3128 jio_fprintf(defaultStream::output_stream(),
3129 "-Dcom.sun.management is not supported in this VM.\n");
3130 return JNI_ERR;
3131 #endif
3132 }
3133 // -Xint
3134 } else if (match_option(option, "-Xint")) {
3135 set_mode_flags(_int);
3136 // -Xmixed
3137 } else if (match_option(option, "-Xmixed")) {
3138 set_mode_flags(_mixed);
3139 // -Xcomp
3140 } else if (match_option(option, "-Xcomp")) {
3141 // for testing the compiler; turn off all flags that inhibit compilation
3142 set_mode_flags(_comp);
3143 // -Xshare:dump
3144 } else if (match_option(option, "-Xshare:dump")) {
3145 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3146 return JNI_EINVAL;
3147 }
3148 set_mode_flags(_int); // Prevent compilation, which creates objects
3149 // -Xshare:on
3150 } else if (match_option(option, "-Xshare:on")) {
3151 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3152 return JNI_EINVAL;
3153 }
3154 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3155 return JNI_EINVAL;
3156 }
3157 // -Xshare:auto
3158 } else if (match_option(option, "-Xshare:auto")) {
3159 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3163 return JNI_EINVAL;
3164 }
3165 // -Xshare:off
3166 } else if (match_option(option, "-Xshare:off")) {
3167 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3168 return JNI_EINVAL;
3169 }
3170 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3171 return JNI_EINVAL;
3172 }
3173 // -Xverify
3174 } else if (match_option(option, "-Xverify", &tail)) {
3175 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3176 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3180 return JNI_EINVAL;
3181 }
3182 } else if (strcmp(tail, ":remote") == 0) {
3183 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3184 return JNI_EINVAL;
3185 }
3186 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 } else if (strcmp(tail, ":none") == 0) {
3190 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3191 return JNI_EINVAL;
3192 }
3193 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3194 return JNI_EINVAL;
3195 }
3196 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3197 return JNI_EINVAL;
3198 }
3199 // -Xdebug
3200 } else if (match_option(option, "-Xdebug")) {
3201 // note this flag has been used, then ignore
3202 set_xdebug_mode(true);
3203 // -Xnoagent
3204 } else if (match_option(option, "-Xnoagent")) {
3205 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3206 } else if (match_option(option, "-Xloggc:", &tail)) {
3207 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3208 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3209 _gc_log_filename = os::strdup_check_oom(tail);
3210 } else if (match_option(option, "-Xlog", &tail)) {
3211 bool ret = false;
3212 if (strcmp(tail, ":help") == 0) {
3213 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3214 vm_exit(0);
3215 } else if (strcmp(tail, ":disable") == 0) {
3216 LogConfiguration::disable_logging();
3217 ret = true;
3218 } else if (*tail == '\0') {
3219 ret = LogConfiguration::parse_command_line_arguments();
3220 assert(ret, "-Xlog without arguments should never fail to parse");
3221 } else if (*tail == ':') {
3222 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3223 }
3224 if (ret == false) {
3225 jio_fprintf(defaultStream::error_stream(),
3226 "Invalid -Xlog option '-Xlog%s'\n",
3227 tail);
3228 return JNI_EINVAL;
3229 }
3230 // JNI hooks
3231 } else if (match_option(option, "-Xcheck", &tail)) {
3232 if (!strcmp(tail, ":jni")) {
3233 #if !INCLUDE_JNI_CHECK
3234 warning("JNI CHECKING is not supported in this VM");
3235 #else
3236 CheckJNICalls = true;
3237 #endif // INCLUDE_JNI_CHECK
3238 } else if (is_bad_option(option, args->ignoreUnrecognized,
3239 "check")) {
3240 return JNI_EINVAL;
3241 }
3242 } else if (match_option(option, "vfprintf")) {
3243 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3244 } else if (match_option(option, "exit")) {
3245 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3246 } else if (match_option(option, "abort")) {
3247 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3248 // -XX:+AggressiveHeap
3249 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3250 jint result = set_aggressive_heap_flags();
3251 if (result != JNI_OK) {
3252 return result;
3253 }
3254 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3255 // and the last option wins.
3256 } else if (match_option(option, "-XX:+NeverTenure")) {
3257 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3258 return JNI_EINVAL;
3259 }
3260 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3261 return JNI_EINVAL;
3262 }
3263 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3264 return JNI_EINVAL;
3265 }
3266 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3267 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3268 return JNI_EINVAL;
3269 }
3270 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3271 return JNI_EINVAL;
3272 }
3273 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3274 return JNI_EINVAL;
3275 }
3276 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3277 uintx max_tenuring_thresh = 0;
3278 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3279 jio_fprintf(defaultStream::error_stream(),
3280 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3281 return JNI_EINVAL;
3282 }
3283
3284 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3285 return JNI_EINVAL;
3286 }
3287
3288 if (MaxTenuringThreshold == 0) {
3289 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3293 return JNI_EINVAL;
3294 }
3295 } else {
3296 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3297 return JNI_EINVAL;
3298 }
3299 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3300 return JNI_EINVAL;
3301 }
3302 }
3303 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3304 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3305 return JNI_EINVAL;
3306 }
3307 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3308 return JNI_EINVAL;
3309 }
3310 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3311 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3312 return JNI_EINVAL;
3313 }
3314 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3315 return JNI_EINVAL;
3316 }
3317 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3318 #if defined(DTRACE_ENABLED)
3319 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3320 return JNI_EINVAL;
3321 }
3322 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3323 return JNI_EINVAL;
3324 }
3325 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3326 return JNI_EINVAL;
3327 }
3328 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3329 return JNI_EINVAL;
3330 }
3331 #else // defined(DTRACE_ENABLED)
3332 jio_fprintf(defaultStream::error_stream(),
3333 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3334 return JNI_EINVAL;
3335 #endif // defined(DTRACE_ENABLED)
3336 #ifdef ASSERT
3337 } else if (match_option(option, "-XX:+FullGCALot")) {
3338 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3339 return JNI_EINVAL;
3340 }
3341 // disable scavenge before parallel mark-compact
3342 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3343 return JNI_EINVAL;
3344 }
3345 #endif
3346 #if !INCLUDE_MANAGEMENT
3347 } else if (match_option(option, "-XX:+ManagementServer")) {
3348 jio_fprintf(defaultStream::error_stream(),
3349 "ManagementServer is not supported in this VM.\n");
3350 return JNI_ERR;
3351 #endif // INCLUDE_MANAGEMENT
3352 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3353 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3354 // already been handled
3355 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3356 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3357 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3358 return JNI_EINVAL;
3359 }
3360 }
3361 // Unknown option
3362 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3363 return JNI_ERR;
3364 }
3365 }
3366
3367 // PrintSharedArchiveAndExit will turn on
3368 // -Xshare:on
3369 // -Xlog:class+path=info
3370 if (PrintSharedArchiveAndExit) {
3371 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3372 return JNI_EINVAL;
3373 }
3374 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3375 return JNI_EINVAL;
3376 }
3377 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3378 }
3379
3380 // Change the default value for flags which have different default values
3381 // when working with older JDKs.
3382 #ifdef LINUX
3383 if (JDK_Version::current().compare_major(6) <= 0 &&
3384 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3385 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3386 }
3387 #endif // LINUX
3388 fix_appclasspath();
3389 return JNI_OK;
3390 }
3391
3392 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3393 // For java.base check for duplicate --patch-module options being specified on the command line.
3394 // This check is only required for java.base, all other duplicate module specifications
3395 // will be checked during module system initialization. The module system initialization
3396 // will throw an ExceptionInInitializerError if this situation occurs.
3397 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3398 if (*patch_mod_javabase) {
3399 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3400 } else {
3401 *patch_mod_javabase = true;
3402 }
3403 }
3404
3405 // Create GrowableArray lazily, only if --patch-module has been specified
3406 if (_patch_mod_prefix == NULL) {
3407 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3408 }
3409
3410 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3411 }
3412
3413 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3414 //
3415 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3416 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3417 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3418 // path is treated as the current directory.
3419 //
3420 // This causes problems with CDS, which requires that all directories specified in the classpath
3421 // must be empty. In most cases, applications do NOT want to load classes from the current
3422 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3423 // scripts compatible with CDS.
3424 void Arguments::fix_appclasspath() {
3425 if (IgnoreEmptyClassPaths) {
3426 const char separator = *os::path_separator();
3427 const char* src = _java_class_path->value();
3428
3429 // skip over all the leading empty paths
3430 while (*src == separator) {
3431 src ++;
3432 }
3433
3434 char* copy = os::strdup_check_oom(src, mtArguments);
3435
3436 // trim all trailing empty paths
3437 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3438 *tail = '\0';
3439 }
3440
3441 char from[3] = {separator, separator, '\0'};
3442 char to [2] = {separator, '\0'};
3443 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3444 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3445 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3446 }
3447
3448 _java_class_path->set_writeable_value(copy);
3449 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3450 }
3451 }
3452
3453 static bool has_jar_files(const char* directory) {
3454 DIR* dir = os::opendir(directory);
3455 if (dir == NULL) return false;
3456
3457 struct dirent *entry;
3458 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3459 bool hasJarFile = false;
3460 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3461 const char* name = entry->d_name;
3462 const char* ext = name + strlen(name) - 4;
3463 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3464 }
3465 FREE_C_HEAP_ARRAY(char, dbuf);
3466 os::closedir(dir);
3467 return hasJarFile ;
3468 }
3469
3470 static int check_non_empty_dirs(const char* path) {
3471 const char separator = *os::path_separator();
3472 const char* const end = path + strlen(path);
3473 int nonEmptyDirs = 0;
3474 while (path < end) {
3475 const char* tmp_end = strchr(path, separator);
3476 if (tmp_end == NULL) {
3477 if (has_jar_files(path)) {
3478 nonEmptyDirs++;
3479 jio_fprintf(defaultStream::output_stream(),
3480 "Non-empty directory: %s\n", path);
3481 }
3482 path = end;
3483 } else {
3484 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3485 memcpy(dirpath, path, tmp_end - path);
3486 dirpath[tmp_end - path] = '\0';
3487 if (has_jar_files(dirpath)) {
3488 nonEmptyDirs++;
3489 jio_fprintf(defaultStream::output_stream(),
3490 "Non-empty directory: %s\n", dirpath);
3491 }
3492 FREE_C_HEAP_ARRAY(char, dirpath);
3493 path = tmp_end + 1;
3494 }
3495 }
3496 return nonEmptyDirs;
3497 }
3498
3499 jint Arguments::finalize_vm_init_args() {
3500 // check if the default lib/endorsed directory exists; if so, error
3501 char path[JVM_MAXPATHLEN];
3502 const char* fileSep = os::file_separator();
3503 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3504
3505 if (CheckEndorsedAndExtDirs) {
3506 int nonEmptyDirs = 0;
3507 // check endorsed directory
3508 nonEmptyDirs += check_non_empty_dirs(path);
3509 // check the extension directories
3510 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3511 if (nonEmptyDirs > 0) {
3512 return JNI_ERR;
3513 }
3514 }
3515
3516 DIR* dir = os::opendir(path);
3517 if (dir != NULL) {
3518 jio_fprintf(defaultStream::output_stream(),
3519 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3520 "in modular form will be supported via the concept of upgradeable modules.\n");
3521 os::closedir(dir);
3522 return JNI_ERR;
3523 }
3524
3525 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3526 dir = os::opendir(path);
3527 if (dir != NULL) {
3528 jio_fprintf(defaultStream::output_stream(),
3529 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3530 "Use -classpath instead.\n.");
3531 os::closedir(dir);
3532 return JNI_ERR;
3533 }
3534
3535 // This must be done after all arguments have been processed.
3536 // java_compiler() true means set to "NONE" or empty.
3537 if (java_compiler() && !xdebug_mode()) {
3538 // For backwards compatibility, we switch to interpreted mode if
3539 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3540 // not specified.
3541 set_mode_flags(_int);
3542 }
3543
3544 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3545 // but like -Xint, leave compilation thresholds unaffected.
3546 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3547 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3548 set_mode_flags(_int);
3549 }
3550
3551 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3552 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3553 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3554 }
3555
3556 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3557 // Don't degrade server performance for footprint
3558 if (FLAG_IS_DEFAULT(UseLargePages) &&
3559 MaxHeapSize < LargePageHeapSizeThreshold) {
3560 // No need for large granularity pages w/small heaps.
3561 // Note that large pages are enabled/disabled for both the
3562 // Java heap and the code cache.
3563 FLAG_SET_DEFAULT(UseLargePages, false);
3564 }
3565
3566 #elif defined(COMPILER2)
3567 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3568 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3569 }
3570 #endif
3571
3572 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3573 UNSUPPORTED_OPTION(ProfileInterpreter);
3574 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3575 #endif
3576
3577 #ifndef TIERED
3578 // Tiered compilation is undefined.
3579 UNSUPPORTED_OPTION(TieredCompilation);
3580 #endif
3581
3582 #if INCLUDE_JVMCI
3583 if (EnableJVMCI &&
3584 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) {
3585 return JNI_ENOMEM;
3586 }
3587 #endif
3588
3589 // If we are running in a headless jre, force java.awt.headless property
3590 // to be true unless the property has already been set.
3591 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3592 if (os::is_headless_jre()) {
3593 const char* headless = Arguments::get_property("java.awt.headless");
3594 if (headless == NULL) {
3595 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3596 if (headless_env == NULL) {
3597 if (!add_property("java.awt.headless=true")) {
3598 return JNI_ENOMEM;
3599 }
3600 } else {
3601 char buffer[256];
3602 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3603 if (!add_property(buffer)) {
3604 return JNI_ENOMEM;
3605 }
3606 }
3607 }
3608 }
3609
3610 if (!check_vm_args_consistency()) {
3611 return JNI_ERR;
3612 }
3613
3614 return JNI_OK;
3615 }
3616
3617 // Helper class for controlling the lifetime of JavaVMInitArgs
3618 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3619 // deleted on the destruction of the ScopedVMInitArgs object.
3620 class ScopedVMInitArgs : public StackObj {
3621 private:
3622 JavaVMInitArgs _args;
3623 char* _container_name;
3624 bool _is_set;
3625 char* _vm_options_file_arg;
3626
3627 public:
3628 ScopedVMInitArgs(const char *container_name) {
3629 _args.version = JNI_VERSION_1_2;
3630 _args.nOptions = 0;
3631 _args.options = NULL;
3632 _args.ignoreUnrecognized = false;
3633 _container_name = (char *)container_name;
3634 _is_set = false;
3635 _vm_options_file_arg = NULL;
3636 }
3637
3638 // Populates the JavaVMInitArgs object represented by this
3639 // ScopedVMInitArgs object with the arguments in options. The
3640 // allocated memory is deleted by the destructor. If this method
3641 // returns anything other than JNI_OK, then this object is in a
3642 // partially constructed state, and should be abandoned.
3643 jint set_args(GrowableArray<JavaVMOption>* options) {
3644 _is_set = true;
3645 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3646 JavaVMOption, options->length(), mtArguments);
3647 if (options_arr == NULL) {
3648 return JNI_ENOMEM;
3649 }
3650 _args.options = options_arr;
3651
3652 for (int i = 0; i < options->length(); i++) {
3653 options_arr[i] = options->at(i);
3654 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3655 if (options_arr[i].optionString == NULL) {
3656 // Rely on the destructor to do cleanup.
3657 _args.nOptions = i;
3658 return JNI_ENOMEM;
3659 }
3660 }
3661
3662 _args.nOptions = options->length();
3663 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3664 return JNI_OK;
3665 }
3666
3667 JavaVMInitArgs* get() { return &_args; }
3668 char* container_name() { return _container_name; }
3669 bool is_set() { return _is_set; }
3670 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3671 char* vm_options_file_arg() { return _vm_options_file_arg; }
3672
3673 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3674 if (_vm_options_file_arg != NULL) {
3675 os::free(_vm_options_file_arg);
3676 }
3677 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3678 }
3679
3680 ~ScopedVMInitArgs() {
3681 if (_vm_options_file_arg != NULL) {
3682 os::free(_vm_options_file_arg);
3683 }
3684 if (_args.options == NULL) return;
3685 for (int i = 0; i < _args.nOptions; i++) {
3686 os::free(_args.options[i].optionString);
3687 }
3688 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3689 }
3690
3691 // Insert options into this option list, to replace option at
3692 // vm_options_file_pos (-XX:VMOptionsFile)
3693 jint insert(const JavaVMInitArgs* args,
3694 const JavaVMInitArgs* args_to_insert,
3695 const int vm_options_file_pos) {
3696 assert(_args.options == NULL, "shouldn't be set yet");
3697 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3698 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3699
3700 int length = args->nOptions + args_to_insert->nOptions - 1;
3701 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3702 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3703 for (int i = 0; i < args->nOptions; i++) {
3704 if (i == vm_options_file_pos) {
3705 // insert the new options starting at the same place as the
3706 // -XX:VMOptionsFile option
3707 for (int j = 0; j < args_to_insert->nOptions; j++) {
3708 options->push(args_to_insert->options[j]);
3709 }
3710 } else {
3711 options->push(args->options[i]);
3712 }
3713 }
3714 // make into options array
3715 jint result = set_args(options);
3716 delete options;
3717 return result;
3718 }
3719 };
3720
3721 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3722 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3723 }
3724
3725 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3726 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3727 }
3728
3729 jint Arguments::parse_options_environment_variable(const char* name,
3730 ScopedVMInitArgs* vm_args) {
3731 char *buffer = ::getenv(name);
3732
3733 // Don't check this environment variable if user has special privileges
3734 // (e.g. unix su command).
3735 if (buffer == NULL || os::have_special_privileges()) {
3736 return JNI_OK;
3737 }
3738
3739 if ((buffer = os::strdup(buffer)) == NULL) {
3740 return JNI_ENOMEM;
3741 }
3742
3743 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3744
3745 os::free(buffer);
3746 return retcode;
3747 }
3748
3749 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3750 // read file into buffer
3751 int fd = ::open(file_name, O_RDONLY);
3752 if (fd < 0) {
3753 jio_fprintf(defaultStream::error_stream(),
3754 "Could not open options file '%s'\n",
3755 file_name);
3756 return JNI_ERR;
3757 }
3758
3759 struct stat stbuf;
3760 int retcode = os::stat(file_name, &stbuf);
3761 if (retcode != 0) {
3762 jio_fprintf(defaultStream::error_stream(),
3763 "Could not stat options file '%s'\n",
3764 file_name);
3765 os::close(fd);
3766 return JNI_ERR;
3767 }
3768
3769 if (stbuf.st_size == 0) {
3770 // tell caller there is no option data and that is ok
3771 os::close(fd);
3772 return JNI_OK;
3773 }
3774
3775 // '+ 1' for NULL termination even with max bytes
3776 size_t bytes_alloc = stbuf.st_size + 1;
3777
3778 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3779 if (NULL == buf) {
3780 jio_fprintf(defaultStream::error_stream(),
3781 "Could not allocate read buffer for options file parse\n");
3782 os::close(fd);
3783 return JNI_ENOMEM;
3784 }
3785
3786 memset(buf, 0, bytes_alloc);
3787
3788 // Fill buffer
3789 // Use ::read() instead of os::read because os::read()
3790 // might do a thread state transition
3791 // and it is too early for that here
3792
3793 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3794 os::close(fd);
3795 if (bytes_read < 0) {
3796 FREE_C_HEAP_ARRAY(char, buf);
3797 jio_fprintf(defaultStream::error_stream(),
3798 "Could not read options file '%s'\n", file_name);
3799 return JNI_ERR;
3800 }
3801
3802 if (bytes_read == 0) {
3803 // tell caller there is no option data and that is ok
3804 FREE_C_HEAP_ARRAY(char, buf);
3805 return JNI_OK;
3806 }
3807
3808 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3809
3810 FREE_C_HEAP_ARRAY(char, buf);
3811 return retcode;
3812 }
3813
3814 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3815 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3816
3817 // some pointers to help with parsing
3818 char *buffer_end = buffer + buf_len;
3819 char *opt_hd = buffer;
3820 char *wrt = buffer;
3821 char *rd = buffer;
3822
3823 // parse all options
3824 while (rd < buffer_end) {
3825 // skip leading white space from the input string
3826 while (rd < buffer_end && isspace(*rd)) {
3827 rd++;
3828 }
3829
3830 if (rd >= buffer_end) {
3831 break;
3832 }
3833
3834 // Remember this is where we found the head of the token.
3835 opt_hd = wrt;
3836
3837 // Tokens are strings of non white space characters separated
3838 // by one or more white spaces.
3839 while (rd < buffer_end && !isspace(*rd)) {
3840 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3841 int quote = *rd; // matching quote to look for
3842 rd++; // don't copy open quote
3843 while (rd < buffer_end && *rd != quote) {
3844 // include everything (even spaces)
3845 // up until the close quote
3846 *wrt++ = *rd++; // copy to option string
3847 }
3848
3849 if (rd < buffer_end) {
3850 rd++; // don't copy close quote
3851 } else {
3852 // did not see closing quote
3853 jio_fprintf(defaultStream::error_stream(),
3854 "Unmatched quote in %s\n", name);
3855 delete options;
3856 return JNI_ERR;
3857 }
3858 } else {
3859 *wrt++ = *rd++; // copy to option string
3860 }
3861 }
3862
3863 // steal a white space character and set it to NULL
3864 *wrt++ = '\0';
3865 // We now have a complete token
3866
3867 JavaVMOption option;
3868 option.optionString = opt_hd;
3869 option.extraInfo = NULL;
3870
3871 options->append(option); // Fill in option
3872
3873 rd++; // Advance to next character
3874 }
3875
3876 // Fill out JavaVMInitArgs structure.
3877 jint status = vm_args->set_args(options);
3878
3879 delete options;
3880 return status;
3881 }
3882
3883 void Arguments::set_shared_spaces_flags() {
3884 if (DumpSharedSpaces) {
3885 if (FailOverToOldVerifier) {
3886 // Don't fall back to the old verifier on verification failure. If a
3887 // class fails verification with the split verifier, it might fail the
3888 // CDS runtime verifier constraint check. In that case, we don't want
3889 // to share the class. We only archive classes that pass the split verifier.
3890 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3891 }
3892
3893 if (RequireSharedSpaces) {
3894 warning("Cannot dump shared archive while using shared archive");
3895 }
3896 UseSharedSpaces = false;
3897 #ifdef _LP64
3898 if (!UseCompressedOops || !UseCompressedClassPointers) {
3899 vm_exit_during_initialization(
3900 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3901 }
3902 } else {
3903 if (!UseCompressedOops || !UseCompressedClassPointers) {
3904 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3905 }
3906 #endif
3907 }
3908 }
3909
3910 // Sharing support
3911 // Construct the path to the archive
3912 static char* get_shared_archive_path() {
3913 char *shared_archive_path;
3914 if (SharedArchiveFile == NULL) {
3915 char jvm_path[JVM_MAXPATHLEN];
3916 os::jvm_path(jvm_path, sizeof(jvm_path));
3917 char *end = strrchr(jvm_path, *os::file_separator());
3918 if (end != NULL) *end = '\0';
3919 size_t jvm_path_len = strlen(jvm_path);
3920 size_t file_sep_len = strlen(os::file_separator());
3921 const size_t len = jvm_path_len + file_sep_len + 20;
3922 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3923 if (shared_archive_path != NULL) {
3924 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3925 jvm_path, os::file_separator());
3926 }
3927 } else {
3928 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3929 }
3930 return shared_archive_path;
3931 }
3932
3933 #ifndef PRODUCT
3934 // Determine whether LogVMOutput should be implicitly turned on.
3935 static bool use_vm_log() {
3936 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3937 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3938 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3939 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3940 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3941 return true;
3942 }
3943
3944 #ifdef COMPILER1
3945 if (PrintC1Statistics) {
3946 return true;
3947 }
3948 #endif // COMPILER1
3949
3950 #ifdef COMPILER2
3951 if (PrintOptoAssembly || PrintOptoStatistics) {
3952 return true;
3953 }
3954 #endif // COMPILER2
3955
3956 return false;
3957 }
3958
3959 #endif // PRODUCT
3960
3961 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3962 for (int index = 0; index < args->nOptions; index++) {
3963 const JavaVMOption* option = args->options + index;
3964 const char* tail;
3965 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3966 return true;
3967 }
3968 }
3969 return false;
3970 }
3971
3972 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3973 const char* vm_options_file,
3974 const int vm_options_file_pos,
3975 ScopedVMInitArgs* vm_options_file_args,
3976 ScopedVMInitArgs* args_out) {
3977 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3978 if (code != JNI_OK) {
3979 return code;
3980 }
3981
3982 if (vm_options_file_args->get()->nOptions < 1) {
3983 return JNI_OK;
3984 }
3985
3986 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3987 jio_fprintf(defaultStream::error_stream(),
3988 "A VM options file may not refer to a VM options file. "
3989 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3990 "options file '%s' in options container '%s' is an error.\n",
3991 vm_options_file_args->vm_options_file_arg(),
3992 vm_options_file_args->container_name());
3993 return JNI_EINVAL;
3994 }
3995
3996 return args_out->insert(args, vm_options_file_args->get(),
3997 vm_options_file_pos);
3998 }
3999
4000 // Expand -XX:VMOptionsFile found in args_in as needed.
4001 // mod_args and args_out parameters may return values as needed.
4002 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4003 ScopedVMInitArgs* mod_args,
4004 JavaVMInitArgs** args_out) {
4005 jint code = match_special_option_and_act(args_in, mod_args);
4006 if (code != JNI_OK) {
4007 return code;
4008 }
4009
4010 if (mod_args->is_set()) {
4011 // args_in contains -XX:VMOptionsFile and mod_args contains the
4012 // original options from args_in along with the options expanded
4013 // from the VMOptionsFile. Return a short-hand to the caller.
4014 *args_out = mod_args->get();
4015 } else {
4016 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4017 }
4018 return JNI_OK;
4019 }
4020
4021 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4022 ScopedVMInitArgs* args_out) {
4023 // Remaining part of option string
4024 const char* tail;
4025 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4026
4027 for (int index = 0; index < args->nOptions; index++) {
4028 const JavaVMOption* option = args->options + index;
4029 if (ArgumentsExt::process_options(option)) {
4030 continue;
4031 }
4032 if (match_option(option, "-XX:Flags=", &tail)) {
4033 Arguments::set_jvm_flags_file(tail);
4034 continue;
4035 }
4036 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4037 if (vm_options_file_args.found_vm_options_file_arg()) {
4038 jio_fprintf(defaultStream::error_stream(),
4039 "The option '%s' is already specified in the options "
4040 "container '%s' so the specification of '%s' in the "
4041 "same options container is an error.\n",
4042 vm_options_file_args.vm_options_file_arg(),
4043 vm_options_file_args.container_name(),
4044 option->optionString);
4045 return JNI_EINVAL;
4046 }
4047 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4048 // If there's a VMOptionsFile, parse that
4049 jint code = insert_vm_options_file(args, tail, index,
4050 &vm_options_file_args, args_out);
4051 if (code != JNI_OK) {
4052 return code;
4053 }
4054 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4055 if (args_out->is_set()) {
4056 // The VMOptions file inserted some options so switch 'args'
4057 // to the new set of options, and continue processing which
4058 // preserves "last option wins" semantics.
4059 args = args_out->get();
4060 // The first option from the VMOptionsFile replaces the
4061 // current option. So we back track to process the
4062 // replacement option.
4063 index--;
4064 }
4065 continue;
4066 }
4067 if (match_option(option, "-XX:+PrintVMOptions")) {
4068 PrintVMOptions = true;
4069 continue;
4070 }
4071 if (match_option(option, "-XX:-PrintVMOptions")) {
4072 PrintVMOptions = false;
4073 continue;
4074 }
4075 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4076 IgnoreUnrecognizedVMOptions = true;
4077 continue;
4078 }
4079 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4080 IgnoreUnrecognizedVMOptions = false;
4081 continue;
4082 }
4083 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4084 CommandLineFlags::printFlags(tty, false);
4085 vm_exit(0);
4086 }
4087 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4088 #if INCLUDE_NMT
4089 // The launcher did not setup nmt environment variable properly.
4090 if (!MemTracker::check_launcher_nmt_support(tail)) {
4091 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4092 }
4093
4094 // Verify if nmt option is valid.
4095 if (MemTracker::verify_nmt_option()) {
4096 // Late initialization, still in single-threaded mode.
4097 if (MemTracker::tracking_level() >= NMT_summary) {
4098 MemTracker::init();
4099 }
4100 } else {
4101 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4102 }
4103 continue;
4104 #else
4105 jio_fprintf(defaultStream::error_stream(),
4106 "Native Memory Tracking is not supported in this VM\n");
4107 return JNI_ERR;
4108 #endif
4109 }
4110
4111 #ifndef PRODUCT
4112 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4113 CommandLineFlags::printFlags(tty, true);
4114 vm_exit(0);
4115 }
4116 #endif
4117 }
4118 return JNI_OK;
4119 }
4120
4121 static void print_options(const JavaVMInitArgs *args) {
4122 const char* tail;
4123 for (int index = 0; index < args->nOptions; index++) {
4124 const JavaVMOption *option = args->options + index;
4125 if (match_option(option, "-XX:", &tail)) {
4126 logOption(tail);
4127 }
4128 }
4129 }
4130
4131 bool Arguments::handle_deprecated_print_gc_flags() {
4132 if (PrintGC) {
4133 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4134 }
4135 if (PrintGCDetails) {
4136 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4137 }
4138
4139 if (_gc_log_filename != NULL) {
4140 // -Xloggc was used to specify a filename
4141 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4142
4143 LogTarget(Error, logging) target;
4144 LogStreamCHeap errstream(target);
4145 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4146 } else if (PrintGC || PrintGCDetails) {
4147 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4148 }
4149 return true;
4150 }
4151
4152 void Arguments::handle_extra_cms_flags(const char* msg) {
4153 SpecialFlag flag;
4154 const char *flag_name = "UseConcMarkSweepGC";
4155 if (lookup_special_flag(flag_name, flag)) {
4156 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4157 warning("%s", msg);
4158 }
4159 }
4160
4161 // Parse entry point called from JNI_CreateJavaVM
4162
4163 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4164 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4165
4166 // Initialize ranges, constraints and writeables
4167 CommandLineFlagRangeList::init();
4168 CommandLineFlagConstraintList::init();
4169 CommandLineFlagWriteableList::init();
4170
4171 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4172 const char* hotspotrc = ".hotspotrc";
4173 bool settings_file_specified = false;
4174 bool needs_hotspotrc_warning = false;
4175 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4176 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4177
4178 // Pointers to current working set of containers
4179 JavaVMInitArgs* cur_cmd_args;
4180 JavaVMInitArgs* cur_java_options_args;
4181 JavaVMInitArgs* cur_java_tool_options_args;
4182
4183 // Containers for modified/expanded options
4184 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4185 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4186 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4187
4188
4189 jint code =
4190 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4191 if (code != JNI_OK) {
4192 return code;
4193 }
4194
4195 code = parse_java_options_environment_variable(&initial_java_options_args);
4196 if (code != JNI_OK) {
4197 return code;
4198 }
4199
4200 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4201 &mod_java_tool_options_args,
4202 &cur_java_tool_options_args);
4203 if (code != JNI_OK) {
4204 return code;
4205 }
4206
4207 code = expand_vm_options_as_needed(initial_cmd_args,
4208 &mod_cmd_args,
4209 &cur_cmd_args);
4210 if (code != JNI_OK) {
4211 return code;
4212 }
4213
4214 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4215 &mod_java_options_args,
4216 &cur_java_options_args);
4217 if (code != JNI_OK) {
4218 return code;
4219 }
4220
4221 const char* flags_file = Arguments::get_jvm_flags_file();
4222 settings_file_specified = (flags_file != NULL);
4223
4224 if (IgnoreUnrecognizedVMOptions) {
4225 cur_cmd_args->ignoreUnrecognized = true;
4226 cur_java_tool_options_args->ignoreUnrecognized = true;
4227 cur_java_options_args->ignoreUnrecognized = true;
4228 }
4229
4230 // Parse specified settings file
4231 if (settings_file_specified) {
4232 if (!process_settings_file(flags_file, true,
4233 cur_cmd_args->ignoreUnrecognized)) {
4234 return JNI_EINVAL;
4235 }
4236 } else {
4237 #ifdef ASSERT
4238 // Parse default .hotspotrc settings file
4239 if (!process_settings_file(".hotspotrc", false,
4240 cur_cmd_args->ignoreUnrecognized)) {
4241 return JNI_EINVAL;
4242 }
4243 #else
4244 struct stat buf;
4245 if (os::stat(hotspotrc, &buf) == 0) {
4246 needs_hotspotrc_warning = true;
4247 }
4248 #endif
4249 }
4250
4251 if (PrintVMOptions) {
4252 print_options(cur_java_tool_options_args);
4253 print_options(cur_cmd_args);
4254 print_options(cur_java_options_args);
4255 }
4256
4257 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4258 jint result = parse_vm_init_args(cur_java_tool_options_args,
4259 cur_java_options_args,
4260 cur_cmd_args);
4261
4262 if (result != JNI_OK) {
4263 return result;
4264 }
4265
4266 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4267 SharedArchivePath = get_shared_archive_path();
4268 if (SharedArchivePath == NULL) {
4269 return JNI_ENOMEM;
4270 }
4271
4272 // Set up VerifySharedSpaces
4273 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4274 VerifySharedSpaces = true;
4275 }
4276
4277 // Delay warning until here so that we've had a chance to process
4278 // the -XX:-PrintWarnings flag
4279 if (needs_hotspotrc_warning) {
4280 warning("%s file is present but has been ignored. "
4281 "Run with -XX:Flags=%s to load the file.",
4282 hotspotrc, hotspotrc);
4283 }
4284
4285 if (needs_module_property_warning) {
4286 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4287 " names that are reserved for internal use.");
4288 }
4289
4290 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4291 UNSUPPORTED_OPTION(UseLargePages);
4292 #endif
4293
4294 ArgumentsExt::report_unsupported_options();
4295
4296 #ifndef PRODUCT
4297 if (TraceBytecodesAt != 0) {
4298 TraceBytecodes = true;
4299 }
4300 if (CountCompiledCalls) {
4301 if (UseCounterDecay) {
4302 warning("UseCounterDecay disabled because CountCalls is set");
4303 UseCounterDecay = false;
4304 }
4305 }
4306 #endif // PRODUCT
4307
4308 if (ScavengeRootsInCode == 0) {
4309 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4310 warning("Forcing ScavengeRootsInCode non-zero");
4311 }
4312 ScavengeRootsInCode = 1;
4313 }
4314
4315 if (!handle_deprecated_print_gc_flags()) {
4316 return JNI_EINVAL;
4317 }
4318
4319 // Set object alignment values.
4320 set_object_alignment();
4321
4322 #if !INCLUDE_CDS
4323 if (DumpSharedSpaces || RequireSharedSpaces) {
4324 jio_fprintf(defaultStream::error_stream(),
4325 "Shared spaces are not supported in this VM\n");
4326 return JNI_ERR;
4327 }
4328 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4329 warning("Shared spaces are not supported in this VM");
4330 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4331 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4332 }
4333 no_shared_spaces("CDS Disabled");
4334 #endif // INCLUDE_CDS
4335
4336 return JNI_OK;
4337 }
4338
4339 jint Arguments::apply_ergo() {
4340 // Set flags based on ergonomics.
4341 set_ergonomics_flags();
4342
4343 set_shared_spaces_flags();
4344
4345 // Check the GC selections again.
4346 if (!check_gc_consistency()) {
4347 return JNI_EINVAL;
4348 }
4349
4350 if (TieredCompilation) {
4351 set_tiered_flags();
4352 } else {
4353 int max_compilation_policy_choice = 1;
4354 #ifdef COMPILER2
4355 max_compilation_policy_choice = 2;
4356 #endif
4357 // Check if the policy is valid.
4358 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4359 vm_exit_during_initialization(
4360 "Incompatible compilation policy selected", NULL);
4361 }
4362 // Scale CompileThreshold
4363 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4364 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4365 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4366 }
4367 }
4368
4369 #ifdef COMPILER2
4370 #ifndef PRODUCT
4371 if (PrintIdealGraphLevel > 0) {
4372 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4373 }
4374 #endif
4375 #endif
4376
4377 // Set heap size based on available physical memory
4378 set_heap_size();
4379
4380 ArgumentsExt::set_gc_specific_flags();
4381
4382 // Initialize Metaspace flags and alignments
4383 Metaspace::ergo_initialize();
4384
4385 // Set bytecode rewriting flags
4386 set_bytecode_flags();
4387
4388 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4389 jint code = set_aggressive_opts_flags();
4390 if (code != JNI_OK) {
4391 return code;
4392 }
4393
4394 // Turn off biased locking for locking debug mode flags,
4395 // which are subtly different from each other but neither works with
4396 // biased locking
4397 if (UseHeavyMonitors
4398 #ifdef COMPILER1
4399 || !UseFastLocking
4400 #endif // COMPILER1
4401 #if INCLUDE_JVMCI
4402 || !JVMCIUseFastLocking
4403 #endif
4404 ) {
4405 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4406 // flag set to true on command line; warn the user that they
4407 // can't enable biased locking here
4408 warning("Biased Locking is not supported with locking debug flags"
4409 "; ignoring UseBiasedLocking flag." );
4410 }
4411 UseBiasedLocking = false;
4412 }
4413
4414 #ifdef CC_INTERP
4415 // Clear flags not supported on zero.
4416 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4417 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4418 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4419 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4420 #endif // CC_INTERP
4421
4422 #ifdef COMPILER2
4423 if (!EliminateLocks) {
4424 EliminateNestedLocks = false;
4425 }
4426 if (!Inline) {
4427 IncrementalInline = false;
4428 }
4429 #ifndef PRODUCT
4430 if (!IncrementalInline) {
4431 AlwaysIncrementalInline = false;
4432 }
4433 #endif
4434 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4435 // nothing to use the profiling, turn if off
4436 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4437 }
4438 #endif
4439
4440 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4441 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4442 DebugNonSafepoints = true;
4443 }
4444
4445 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4446 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4447 }
4448
4449 if (UseOnStackReplacement && !UseLoopCounter) {
4450 warning("On-stack-replacement requires loop counters; enabling loop counters");
4451 FLAG_SET_DEFAULT(UseLoopCounter, true);
4452 }
4453
4454 #ifndef PRODUCT
4455 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4456 if (use_vm_log()) {
4457 LogVMOutput = true;
4458 }
4459 }
4460 #endif // PRODUCT
4461
4462 if (PrintCommandLineFlags) {
4463 CommandLineFlags::printSetFlags(tty);
4464 }
4465
4466 // Apply CPU specific policy for the BiasedLocking
4467 if (UseBiasedLocking) {
4468 if (!VM_Version::use_biased_locking() &&
4469 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4470 UseBiasedLocking = false;
4471 }
4472 }
4473 #ifdef COMPILER2
4474 if (!UseBiasedLocking || EmitSync != 0) {
4475 UseOptoBiasInlining = false;
4476 }
4477 #endif
4478
4479 return JNI_OK;
4480 }
4481
4482 jint Arguments::adjust_after_os() {
4483 if (UseNUMA) {
4484 if (UseParallelGC || UseParallelOldGC) {
4485 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4486 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4487 }
4488 }
4489 // UseNUMAInterleaving is set to ON for all collectors and
4490 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4491 // such as the parallel collector for Linux and Solaris will
4492 // interleave old gen and survivor spaces on top of NUMA
4493 // allocation policy for the eden space.
4494 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4495 // all platforms and ParallelGC on Windows will interleave all
4496 // of the heap spaces across NUMA nodes.
4497 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4498 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4499 }
4500 }
4501 return JNI_OK;
4502 }
4503
4504 int Arguments::PropertyList_count(SystemProperty* pl) {
4505 int count = 0;
4506 while(pl != NULL) {
4507 count++;
4508 pl = pl->next();
4509 }
4510 return count;
4511 }
4512
4513 // Return the number of readable properties.
4514 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4515 int count = 0;
4516 while(pl != NULL) {
4517 if (pl->is_readable()) {
4518 count++;
4519 }
4520 pl = pl->next();
4521 }
4522 return count;
4523 }
4524
4525 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4526 assert(key != NULL, "just checking");
4527 SystemProperty* prop;
4528 for (prop = pl; prop != NULL; prop = prop->next()) {
4529 if (strcmp(key, prop->key()) == 0) return prop->value();
4530 }
4531 return NULL;
4532 }
4533
4534 // Return the value of the requested property provided that it is a readable property.
4535 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4536 assert(key != NULL, "just checking");
4537 SystemProperty* prop;
4538 // Return the property value if the keys match and the property is not internal or
4539 // it's the special internal property "jdk.boot.class.path.append".
4540 for (prop = pl; prop != NULL; prop = prop->next()) {
4541 if (strcmp(key, prop->key()) == 0) {
4542 if (!prop->internal()) {
4543 return prop->value();
4544 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4545 return prop->value();
4546 } else {
4547 // Property is internal and not jdk.boot.class.path.append so return NULL.
4548 return NULL;
4549 }
4550 }
4551 }
4552 return NULL;
4553 }
4554
4555 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4556 int count = 0;
4557 const char* ret_val = NULL;
4558
4559 while(pl != NULL) {
4560 if(count >= index) {
4561 ret_val = pl->key();
4562 break;
4563 }
4564 count++;
4565 pl = pl->next();
4566 }
4567
4568 return ret_val;
4569 }
4570
4571 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4572 int count = 0;
4573 char* ret_val = NULL;
4574
4575 while(pl != NULL) {
4576 if(count >= index) {
4577 ret_val = pl->value();
4578 break;
4579 }
4580 count++;
4581 pl = pl->next();
4582 }
4583
4584 return ret_val;
4585 }
4586
4587 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4588 SystemProperty* p = *plist;
4589 if (p == NULL) {
4590 *plist = new_p;
4591 } else {
4592 while (p->next() != NULL) {
4593 p = p->next();
4594 }
4595 p->set_next(new_p);
4596 }
4597 }
4598
4599 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4600 bool writeable, bool internal) {
4601 if (plist == NULL)
4602 return;
4603
4604 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4605 PropertyList_add(plist, new_p);
4606 }
4607
4608 void Arguments::PropertyList_add(SystemProperty *element) {
4609 PropertyList_add(&_system_properties, element);
4610 }
4611
4612 // This add maintains unique property key in the list.
4613 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4614 PropertyAppendable append, PropertyWriteable writeable,
4615 PropertyInternal internal) {
4616 if (plist == NULL)
4617 return;
4618
4619 // If property key exist then update with new value.
4620 SystemProperty* prop;
4621 for (prop = *plist; prop != NULL; prop = prop->next()) {
4622 if (strcmp(k, prop->key()) == 0) {
4623 if (append == AppendProperty) {
4624 prop->append_value(v);
4625 } else {
4626 prop->set_value(v);
4627 }
4628 return;
4629 }
4630 }
4631
4632 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4633 }
4634
4635 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4636 // Returns true if all of the source pointed by src has been copied over to
4637 // the destination buffer pointed by buf. Otherwise, returns false.
4638 // Notes:
4639 // 1. If the length (buflen) of the destination buffer excluding the
4640 // NULL terminator character is not long enough for holding the expanded
4641 // pid characters, it also returns false instead of returning the partially
4642 // expanded one.
4643 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4644 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4645 char* buf, size_t buflen) {
4646 const char* p = src;
4647 char* b = buf;
4648 const char* src_end = &src[srclen];
4649 char* buf_end = &buf[buflen - 1];
4650
4651 while (p < src_end && b < buf_end) {
4652 if (*p == '%') {
4653 switch (*(++p)) {
4654 case '%': // "%%" ==> "%"
4655 *b++ = *p++;
4656 break;
4657 case 'p': { // "%p" ==> current process id
4658 // buf_end points to the character before the last character so
4659 // that we could write '\0' to the end of the buffer.
4660 size_t buf_sz = buf_end - b + 1;
4661 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4662
4663 // if jio_snprintf fails or the buffer is not long enough to hold
4664 // the expanded pid, returns false.
4665 if (ret < 0 || ret >= (int)buf_sz) {
4666 return false;
4667 } else {
4668 b += ret;
4669 assert(*b == '\0', "fail in copy_expand_pid");
4670 if (p == src_end && b == buf_end + 1) {
4671 // reach the end of the buffer.
4672 return true;
4673 }
4674 }
4675 p++;
4676 break;
4677 }
4678 default :
4679 *b++ = '%';
4680 }
4681 } else {
4682 *b++ = *p++;
4683 }
4684 }
4685 *b = '\0';
4686 return (p == src_end); // return false if not all of the source was copied
4687 }