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/jvm.h"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/vm_version.hpp"
54 #include "services/management.hpp"
55 #include "services/memTracker.hpp"
56 #include "utilities/align.hpp"
57 #include "utilities/defaultStream.hpp"
58 #include "utilities/macros.hpp"
59 #include "utilities/stringUtils.hpp"
60 #if INCLUDE_JVMCI
61 #include "jvmci/jvmciRuntime.hpp"
62 #endif
63 #if INCLUDE_ALL_GCS
64 #include "gc/cms/compactibleFreeListSpace.hpp"
65 #include "gc/g1/g1CollectedHeap.inline.hpp"
66 #include "gc/parallel/parallelScavengeHeap.hpp"
67 #endif // INCLUDE_ALL_GCS
68
69 // Note: This is a special bug reporting site for the JVM
70 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
71 #define DEFAULT_JAVA_LAUNCHER "generic"
72
73 char* Arguments::_jvm_flags_file = NULL;
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 bool Arguments::_has_profile = false;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 size_t Arguments::_min_heap_size = 0;
84 Arguments::Mode Arguments::_mode = _mixed;
85 bool Arguments::_java_compiler = false;
86 bool Arguments::_xdebug_mode = false;
87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
89 int Arguments::_sun_java_launcher_pid = -1;
90 bool Arguments::_sun_java_launcher_is_altjvm = false;
91
92 // These parameters are reset in method parse_vm_init_args()
93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
95 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
96 bool Arguments::_ClipInlining = ClipInlining;
97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
99
100 char* Arguments::SharedArchivePath = NULL;
101
102 AgentLibraryList Arguments::_libraryList;
103 AgentLibraryList Arguments::_agentList;
104
105 abort_hook_t Arguments::_abort_hook = NULL;
106 exit_hook_t Arguments::_exit_hook = NULL;
107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
108
109
110 SystemProperty *Arguments::_sun_boot_library_path = NULL;
111 SystemProperty *Arguments::_java_library_path = NULL;
112 SystemProperty *Arguments::_java_home = NULL;
113 SystemProperty *Arguments::_java_class_path = NULL;
114 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
115
116 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
117 PathString *Arguments::_system_boot_class_path = NULL;
118 bool Arguments::_has_jimage = false;
119
120 char* Arguments::_ext_dirs = NULL;
121
122 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
123 // part of the option string.
124 static bool match_option(const JavaVMOption *option, const char* name,
125 const char** tail) {
126 size_t len = strlen(name);
127 if (strncmp(option->optionString, name, len) == 0) {
128 *tail = option->optionString + len;
129 return true;
130 } else {
131 return false;
132 }
133 }
134
135 // Check if 'option' matches 'name'. No "tail" is allowed.
136 static bool match_option(const JavaVMOption *option, const char* name) {
137 const char* tail = NULL;
138 bool result = match_option(option, name, &tail);
139 if (tail != NULL && *tail == '\0') {
140 return result;
141 } else {
142 return false;
143 }
144 }
145
146 // Return true if any of the strings in null-terminated array 'names' matches.
147 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
148 // the option must match exactly.
149 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
150 bool tail_allowed) {
151 for (/* empty */; *names != NULL; ++names) {
152 if (match_option(option, *names, tail)) {
153 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
154 return true;
155 }
156 }
157 }
158 return false;
159 }
160
161 static void logOption(const char* opt) {
162 if (PrintVMOptions) {
163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
164 }
165 }
166
167 bool needs_module_property_warning = false;
168
169 #define MODULE_PROPERTY_PREFIX "jdk.module."
170 #define MODULE_PROPERTY_PREFIX_LEN 11
171 #define ADDEXPORTS "addexports"
172 #define ADDEXPORTS_LEN 10
173 #define ADDREADS "addreads"
174 #define ADDREADS_LEN 8
175 #define ADDOPENS "addopens"
176 #define ADDOPENS_LEN 8
177 #define PATCH "patch"
178 #define PATCH_LEN 5
179 #define ADDMODS "addmods"
180 #define ADDMODS_LEN 7
181 #define LIMITMODS "limitmods"
182 #define LIMITMODS_LEN 9
183 #define PATH "path"
184 #define PATH_LEN 4
185 #define UPGRADE_PATH "upgrade.path"
186 #define UPGRADE_PATH_LEN 12
187
188 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
189 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
190 return ((strncmp(option, property, len) == 0) &&
191 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
192 }
193
194 // Return true if property starts with "jdk.module." and its ensuing chars match
195 // any of the reserved module properties.
196 // property should be passed without the leading "-D".
197 bool Arguments::is_internal_module_property(const char* property) {
198 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
199 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
200 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
201 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
202 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
203 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
204 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
205 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
206 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
207 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
208 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
209 return true;
210 }
211 }
212 return false;
213 }
214
215 // Process java launcher properties.
216 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
217 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
218 // sun.java.launcher.pid is defined.
219 // Must do this before setting up other system properties,
220 // as some of them may depend on launcher type.
221 for (int index = 0; index < args->nOptions; index++) {
222 const JavaVMOption* option = args->options + index;
223 const char* tail;
224
225 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
226 process_java_launcher_argument(tail, option->extraInfo);
227 continue;
228 }
229 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
230 if (strcmp(tail, "true") == 0) {
231 _sun_java_launcher_is_altjvm = true;
232 }
233 continue;
234 }
235 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
236 _sun_java_launcher_pid = atoi(tail);
237 continue;
238 }
239 }
240 }
241
242 // Initialize system properties key and value.
243 void Arguments::init_system_properties() {
244
245 // Set up _system_boot_class_path which is not a property but
246 // relies heavily on argument processing and the jdk.boot.class.path.append
247 // property. It is used to store the underlying system boot class path.
248 _system_boot_class_path = new PathString(NULL);
249
250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
251 "Java Virtual Machine Specification", false));
252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
253 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
254 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
255 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
256
257 // Following are JVMTI agent writable properties.
258 // Properties values are set to NULL and they are
259 // os specific they are initialized in os::init_system_properties_values().
260 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
261 _java_library_path = new SystemProperty("java.library.path", NULL, true);
262 _java_home = new SystemProperty("java.home", NULL, true);
263 _java_class_path = new SystemProperty("java.class.path", "", true);
264 // jdk.boot.class.path.append is a non-writeable, internal property.
265 // It can only be set by either:
266 // - -Xbootclasspath/a:
267 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
268 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
269
270 // Add to System Property list.
271 PropertyList_add(&_system_properties, _sun_boot_library_path);
272 PropertyList_add(&_system_properties, _java_library_path);
273 PropertyList_add(&_system_properties, _java_home);
274 PropertyList_add(&_system_properties, _java_class_path);
275 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
276
277 // Set OS specific system properties values
278 os::init_system_properties_values();
279 }
280
281 // Update/Initialize System properties after JDK version number is known
282 void Arguments::init_version_specific_system_properties() {
283 enum { bufsz = 16 };
284 char buffer[bufsz];
285 const char* spec_vendor = "Oracle Corporation";
286 uint32_t spec_version = JDK_Version::current().major_version();
287
288 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
289
290 PropertyList_add(&_system_properties,
291 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
292 PropertyList_add(&_system_properties,
293 new SystemProperty("java.vm.specification.version", buffer, false));
294 PropertyList_add(&_system_properties,
295 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
296 }
297
298 /*
299 * -XX argument processing:
300 *
301 * -XX arguments are defined in several places, such as:
302 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
303 * -XX arguments are parsed in parse_argument().
304 * -XX argument bounds checking is done in check_vm_args_consistency().
305 *
306 * Over time -XX arguments may change. There are mechanisms to handle common cases:
307 *
308 * ALIASED: An option that is simply another name for another option. This is often
309 * part of the process of deprecating a flag, but not all aliases need
310 * to be deprecated.
311 *
312 * Create an alias for an option by adding the old and new option names to the
313 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
314 *
315 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
316 * support may be removed in the future. Both regular and aliased options may be
317 * deprecated.
318 *
319 * Add a deprecation warning for an option (or alias) by adding an entry in the
320 * "special_jvm_flags" table and setting the "deprecated_in" field.
321 * Often an option "deprecated" in one major release will
322 * be made "obsolete" in the next. In this case the entry should also have it's
323 * "obsolete_in" field set.
324 *
325 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
326 * on the command line. A warning is printed to let the user know that option might not
327 * be accepted in the future.
328 *
329 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
330 * table and setting the "obsolete_in" field.
331 *
332 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
333 * to the current JDK version. The system will flatly refuse to admit the existence of
334 * the flag. This allows a flag to die automatically over JDK releases.
335 *
336 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
337 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
338 * - Newly obsolete or expired deprecated options should have their global variable
339 * definitions removed (from globals.hpp, etc) and related implementations removed.
340 *
341 * Recommended approach for removing options:
342 *
343 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
344 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
345 *
346 * To remove internal options (e.g. diagnostic, experimental, develop options), use
347 * a 2-step model adding major release numbers to the obsolete and expire columns.
348 *
349 * To change the name of an option, use the alias table as well as a 2-step
350 * model adding major release numbers to the deprecate and expire columns.
351 * Think twice about aliasing commonly used customer options.
352 *
353 * There are times when it is appropriate to leave a future release number as undefined.
354 *
355 * Tests: Aliases should be tested in VMAliasOptions.java.
356 * Deprecated options should be tested in VMDeprecatedOptions.java.
357 */
358
359 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
360 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
361 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
362 // the command-line as usual, but will issue a warning.
363 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
364 // the command-line, while issuing a warning and ignoring the flag value.
365 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
366 // existence of the flag.
367 //
368 // MANUAL CLEANUP ON JDK VERSION UPDATES:
369 // This table ensures that the handling of options will update automatically when the JDK
370 // version is incremented, but the source code needs to be cleanup up manually:
371 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
372 // variable should be removed, as well as users of the variable.
373 // - As "deprecated" options age into "obsolete" options, move the entry into the
374 // "Obsolete Flags" section of the table.
375 // - All expired options should be removed from the table.
376 static SpecialFlag const special_jvm_flags[] = {
377 // -------------- Deprecated Flags --------------
378 // --- Non-alias flags - sorted by obsolete_in then expired_in:
379 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
380 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
381
382 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
383 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
384 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
385
386 // -------------- Obsolete Flags - sorted by expired_in --------------
387 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
388 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
389 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
390 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
391 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
392
393 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
394 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
395 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
396 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
397 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
398 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
399 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
400 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
401 #endif
402
403 { NULL, JDK_Version(0), JDK_Version(0) }
404 };
405
406 // Flags that are aliases for other flags.
407 typedef struct {
408 const char* alias_name;
409 const char* real_name;
410 } AliasedFlag;
411
412 static AliasedFlag const aliased_jvm_flags[] = {
413 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
414 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
415 { NULL, NULL}
416 };
417
418 // NOTE: A compatibility request will be necessary for each alias to be removed.
419 static AliasedLoggingFlag const aliased_logging_flags[] = {
420 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
421 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
422 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
423 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
424 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
425 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
426 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
427 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
428 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
429 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
430 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
431 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
432 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
433 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
434 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
435 };
436
437 #ifndef PRODUCT
438 // These options are removed in jdk9. Remove this code for jdk10.
439 static AliasedFlag const removed_develop_logging_flags[] = {
440 { "TraceClassInitialization", "-Xlog:class+init" },
441 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
442 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
443 { "TraceItables", "-Xlog:itables=debug" },
444 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
445 { "TraceSafepoint", "-Xlog:safepoint=debug" },
446 { "TraceStartupTime", "-Xlog:startuptime" },
447 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
448 { "PrintVtables", "-Xlog:vtables=debug" },
449 { "VerboseVerification", "-Xlog:verification" },
450 { NULL, NULL }
451 };
452 #endif //PRODUCT
453
454 // Return true if "v" is less than "other", where "other" may be "undefined".
455 static bool version_less_than(JDK_Version v, JDK_Version other) {
456 assert(!v.is_undefined(), "must be defined");
457 if (!other.is_undefined() && v.compare(other) >= 0) {
458 return false;
459 } else {
460 return true;
461 }
462 }
463
464 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
465
466 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
467 // Allow extensions to have priority
468 if (lookup_special_flag_ext(flag_name, flag)) {
469 return true;
470 }
471
472 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
473 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
474 flag = special_jvm_flags[i];
475 return true;
476 }
477 }
478 return false;
479 }
480
481 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
482 assert(version != NULL, "Must provide a version buffer");
483 SpecialFlag flag;
484 if (lookup_special_flag(flag_name, flag)) {
485 if (!flag.obsolete_in.is_undefined()) {
486 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
487 *version = flag.obsolete_in;
488 return true;
489 }
490 }
491 }
492 return false;
493 }
494
495 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
496 assert(version != NULL, "Must provide a version buffer");
497 SpecialFlag flag;
498 if (lookup_special_flag(flag_name, flag)) {
499 if (!flag.deprecated_in.is_undefined()) {
500 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
501 version_less_than(JDK_Version::current(), flag.expired_in)) {
502 *version = flag.deprecated_in;
503 return 1;
504 } else {
505 return -1;
506 }
507 }
508 }
509 return 0;
510 }
511
512 #ifndef PRODUCT
513 const char* Arguments::removed_develop_logging_flag_name(const char* name){
514 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
515 const AliasedFlag& flag = removed_develop_logging_flags[i];
516 if (strcmp(flag.alias_name, name) == 0) {
517 return flag.real_name;
518 }
519 }
520 return NULL;
521 }
522 #endif // PRODUCT
523
524 const char* Arguments::real_flag_name(const char *flag_name) {
525 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
526 const AliasedFlag& flag_status = aliased_jvm_flags[i];
527 if (strcmp(flag_status.alias_name, flag_name) == 0) {
528 return flag_status.real_name;
529 }
530 }
531 return flag_name;
532 }
533
534 #ifdef ASSERT
535 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
536 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
537 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
538 return true;
539 }
540 }
541 return false;
542 }
543
544 static bool verify_special_jvm_flags() {
545 bool success = true;
546 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
547 const SpecialFlag& flag = special_jvm_flags[i];
548 if (lookup_special_flag(flag.name, i)) {
549 warning("Duplicate special flag declaration \"%s\"", flag.name);
550 success = false;
551 }
552 if (flag.deprecated_in.is_undefined() &&
553 flag.obsolete_in.is_undefined()) {
554 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
555 success = false;
556 }
557
558 if (!flag.deprecated_in.is_undefined()) {
559 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
560 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
561 success = false;
562 }
563
564 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
565 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
566 success = false;
567 }
568 }
569
570 if (!flag.obsolete_in.is_undefined()) {
571 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
572 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
573 success = false;
574 }
575
576 // if flag has become obsolete it should not have a "globals" flag defined anymore.
577 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
578 if (Flag::find_flag(flag.name) != NULL) {
579 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
580 success = false;
581 }
582 }
583 }
584
585 if (!flag.expired_in.is_undefined()) {
586 // if flag has become expired it should not have a "globals" flag defined anymore.
587 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
588 if (Flag::find_flag(flag.name) != NULL) {
589 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
590 success = false;
591 }
592 }
593 }
594
595 }
596 return success;
597 }
598 #endif
599
600 // Parses a size specification string.
601 bool Arguments::atojulong(const char *s, julong* result) {
602 julong n = 0;
603
604 // First char must be a digit. Don't allow negative numbers or leading spaces.
605 if (!isdigit(*s)) {
606 return false;
607 }
608
609 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
610 char* remainder;
611 errno = 0;
612 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
613 if (errno != 0) {
614 return false;
615 }
616
617 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
618 if (remainder == s || strlen(remainder) > 1) {
619 return false;
620 }
621
622 switch (*remainder) {
623 case 'T': case 't':
624 *result = n * G * K;
625 // Check for overflow.
626 if (*result/((julong)G * K) != n) return false;
627 return true;
628 case 'G': case 'g':
629 *result = n * G;
630 if (*result/G != n) return false;
631 return true;
632 case 'M': case 'm':
633 *result = n * M;
634 if (*result/M != n) return false;
635 return true;
636 case 'K': case 'k':
637 *result = n * K;
638 if (*result/K != n) return false;
639 return true;
640 case '\0':
641 *result = n;
642 return true;
643 default:
644 return false;
645 }
646 }
647
648 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
649 if (size < min_size) return arg_too_small;
650 if (size > max_size) return arg_too_big;
651 return arg_in_range;
652 }
653
654 // Describe an argument out of range error
655 void Arguments::describe_range_error(ArgsRange errcode) {
656 switch(errcode) {
657 case arg_too_big:
658 jio_fprintf(defaultStream::error_stream(),
659 "The specified size exceeds the maximum "
660 "representable size.\n");
661 break;
662 case arg_too_small:
663 case arg_unreadable:
664 case arg_in_range:
665 // do nothing for now
666 break;
667 default:
668 ShouldNotReachHere();
669 }
670 }
671
672 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
673 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
674 return true;
675 } else {
676 return false;
677 }
678 }
679
680 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
681 char* end;
682 errno = 0;
683 double v = strtod(value, &end);
684 if ((errno != 0) || (*end != 0)) {
685 return false;
686 }
687
688 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
689 return true;
690 }
691 return false;
692 }
693
694 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
695 julong v;
696 int int_v;
697 intx intx_v;
698 bool is_neg = false;
699 Flag* result = Flag::find_flag(name, strlen(name));
700
701 if (result == NULL) {
702 return false;
703 }
704
705 // Check the sign first since atojulong() parses only unsigned values.
706 if (*value == '-') {
707 if (!result->is_intx() && !result->is_int()) {
708 return false;
709 }
710 value++;
711 is_neg = true;
712 }
713 if (!Arguments::atojulong(value, &v)) {
714 return false;
715 }
716 if (result->is_int()) {
717 int_v = (int) v;
718 if (is_neg) {
719 int_v = -int_v;
720 }
721 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
722 } else if (result->is_uint()) {
723 uint uint_v = (uint) v;
724 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
725 } else if (result->is_intx()) {
726 intx_v = (intx) v;
727 if (is_neg) {
728 intx_v = -intx_v;
729 }
730 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
731 } else if (result->is_uintx()) {
732 uintx uintx_v = (uintx) v;
733 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
734 } else if (result->is_uint64_t()) {
735 uint64_t uint64_t_v = (uint64_t) v;
736 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
737 } else if (result->is_size_t()) {
738 size_t size_t_v = (size_t) v;
739 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
740 } else if (result->is_double()) {
741 double double_v = (double) v;
742 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
743 } else {
744 return false;
745 }
746 }
747
748 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
749 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
750 // Contract: CommandLineFlags always returns a pointer that needs freeing.
751 FREE_C_HEAP_ARRAY(char, value);
752 return true;
753 }
754
755 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
756 const char* old_value = "";
757 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
758 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
759 size_t new_len = strlen(new_value);
760 const char* value;
761 char* free_this_too = NULL;
762 if (old_len == 0) {
763 value = new_value;
764 } else if (new_len == 0) {
765 value = old_value;
766 } else {
767 size_t length = old_len + 1 + new_len + 1;
768 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
769 // each new setting adds another LINE to the switch:
770 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
771 value = buf;
772 free_this_too = buf;
773 }
774 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
775 // CommandLineFlags always returns a pointer that needs freeing.
776 FREE_C_HEAP_ARRAY(char, value);
777 if (free_this_too != NULL) {
778 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
779 FREE_C_HEAP_ARRAY(char, free_this_too);
780 }
781 return true;
782 }
783
784 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
785 const char* real_name = real_flag_name(arg);
786 JDK_Version since = JDK_Version();
787 switch (is_deprecated_flag(arg, &since)) {
788 case -1:
789 return NULL; // obsolete or expired, don't process normally
790 case 0:
791 return real_name;
792 case 1: {
793 if (warn) {
794 char version[256];
795 since.to_string(version, sizeof(version));
796 if (real_name != arg) {
797 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
798 arg, version, real_name);
799 } else {
800 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
801 arg, version);
802 }
803 }
804 return real_name;
805 }
806 }
807 ShouldNotReachHere();
808 return NULL;
809 }
810
811 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
812 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
813 // Set tagset string buffer at max size of 256, large enough for any alias tagset
814 const int max_tagset_size = 256;
815 int max_tagset_len = max_tagset_size - 1;
816 char tagset_buffer[max_tagset_size];
817 tagset_buffer[0] = '\0';
818
819 // Write tag-set for aliased logging option, in string list form
820 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
821 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
822 if (i > 0) {
823 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
824 }
825 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
826 }
827 if (!alf.exactMatch) {
828 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
829 }
830 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
831 (on) ? "+" : "-",
832 name,
833 tagset_buffer,
834 (on) ? LogLevel::name(alf.level) : "off");
835 }
836
837 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
838 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
839 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
840 if (strcmp(alf.alias_name, name) == 0) {
841 log_deprecated_flag(name, on, alf);
842 return alf;
843 }
844 }
845 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
846 return a;
847 }
848
849 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
850
851 // range of acceptable characters spelled out for portability reasons
852 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
853 #define BUFLEN 255
854 char name[BUFLEN+1];
855 char dummy;
856 const char* real_name;
857 bool warn_if_deprecated = true;
858
859 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
860 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
861 if (alf.alias_name != NULL){
862 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
863 return true;
864 }
865 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
866 if (real_name == NULL) {
867 return false;
868 }
869 return set_bool_flag(real_name, false, origin);
870 }
871 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
872 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
873 if (alf.alias_name != NULL){
874 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
875 return true;
876 }
877 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
878 if (real_name == NULL) {
879 return false;
880 }
881 return set_bool_flag(real_name, true, origin);
882 }
883
884 char punct;
885 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
886 const char* value = strchr(arg, '=') + 1;
887 Flag* flag;
888
889 // this scanf pattern matches both strings (handled here) and numbers (handled later))
890 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
891 if (alf.alias_name != NULL) {
892 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
893 return true;
894 }
895 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
896 if (real_name == NULL) {
897 return false;
898 }
899 flag = Flag::find_flag(real_name);
900 if (flag != NULL && flag->is_ccstr()) {
901 if (flag->ccstr_accumulates()) {
902 return append_to_string_flag(real_name, value, origin);
903 } else {
904 if (value[0] == '\0') {
905 value = NULL;
906 }
907 return set_string_flag(real_name, value, origin);
908 }
909 } else {
910 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
911 }
912 }
913
914 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
915 const char* value = strchr(arg, '=') + 1;
916 // -XX:Foo:=xxx will reset the string flag to the given value.
917 if (value[0] == '\0') {
918 value = NULL;
919 }
920 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
921 if (real_name == NULL) {
922 return false;
923 }
924 return set_string_flag(real_name, value, origin);
925 }
926
927 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
928 #define SIGNED_NUMBER_RANGE "[-0123456789]"
929 #define NUMBER_RANGE "[0123456789eE+-]"
930 char value[BUFLEN + 1];
931 char value2[BUFLEN + 1];
932 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
933 // Looks like a floating-point number -- try again with more lenient format string
934 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
935 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
936 if (real_name == NULL) {
937 return false;
938 }
939 return set_fp_numeric_flag(real_name, value, origin);
940 }
941 }
942
943 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
944 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
945 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
946 if (real_name == NULL) {
947 return false;
948 }
949 return set_numeric_flag(real_name, value, origin);
950 }
951
952 return false;
953 }
954
955 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
956 assert(bldarray != NULL, "illegal argument");
957
958 if (arg == NULL) {
959 return;
960 }
961
962 int new_count = *count + 1;
963
964 // expand the array and add arg to the last element
965 if (*bldarray == NULL) {
966 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
967 } else {
968 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
969 }
970 (*bldarray)[*count] = os::strdup_check_oom(arg);
971 *count = new_count;
972 }
973
974 void Arguments::build_jvm_args(const char* arg) {
975 add_string(&_jvm_args_array, &_num_jvm_args, arg);
976 }
977
978 void Arguments::build_jvm_flags(const char* arg) {
979 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
980 }
981
982 // utility function to return a string that concatenates all
983 // strings in a given char** array
984 const char* Arguments::build_resource_string(char** args, int count) {
985 if (args == NULL || count == 0) {
986 return NULL;
987 }
988 size_t length = 0;
989 for (int i = 0; i < count; i++) {
990 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
991 }
992 char* s = NEW_RESOURCE_ARRAY(char, length);
993 char* dst = s;
994 for (int j = 0; j < count; j++) {
995 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
996 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
997 dst += offset;
998 length -= offset;
999 }
1000 return (const char*) s;
1001 }
1002
1003 void Arguments::print_on(outputStream* st) {
1004 st->print_cr("VM Arguments:");
1005 if (num_jvm_flags() > 0) {
1006 st->print("jvm_flags: "); print_jvm_flags_on(st);
1007 st->cr();
1008 }
1009 if (num_jvm_args() > 0) {
1010 st->print("jvm_args: "); print_jvm_args_on(st);
1011 st->cr();
1012 }
1013 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1014 if (_java_class_path != NULL) {
1015 char* path = _java_class_path->value();
1016 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1017 }
1018 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1019 }
1020
1021 void Arguments::print_summary_on(outputStream* st) {
1022 // Print the command line. Environment variables that are helpful for
1023 // reproducing the problem are written later in the hs_err file.
1024 // flags are from setting file
1025 if (num_jvm_flags() > 0) {
1026 st->print_raw("Settings File: ");
1027 print_jvm_flags_on(st);
1028 st->cr();
1029 }
1030 // args are the command line and environment variable arguments.
1031 st->print_raw("Command Line: ");
1032 if (num_jvm_args() > 0) {
1033 print_jvm_args_on(st);
1034 }
1035 // this is the classfile and any arguments to the java program
1036 if (java_command() != NULL) {
1037 st->print("%s", java_command());
1038 }
1039 st->cr();
1040 }
1041
1042 void Arguments::print_jvm_flags_on(outputStream* st) {
1043 if (_num_jvm_flags > 0) {
1044 for (int i=0; i < _num_jvm_flags; i++) {
1045 st->print("%s ", _jvm_flags_array[i]);
1046 }
1047 }
1048 }
1049
1050 void Arguments::print_jvm_args_on(outputStream* st) {
1051 if (_num_jvm_args > 0) {
1052 for (int i=0; i < _num_jvm_args; i++) {
1053 st->print("%s ", _jvm_args_array[i]);
1054 }
1055 }
1056 }
1057
1058 bool Arguments::process_argument(const char* arg,
1059 jboolean ignore_unrecognized,
1060 Flag::Flags origin) {
1061 JDK_Version since = JDK_Version();
1062
1063 if (parse_argument(arg, origin)) {
1064 return true;
1065 }
1066
1067 // Determine if the flag has '+', '-', or '=' characters.
1068 bool has_plus_minus = (*arg == '+' || *arg == '-');
1069 const char* const argname = has_plus_minus ? arg + 1 : arg;
1070
1071 size_t arg_len;
1072 const char* equal_sign = strchr(argname, '=');
1073 if (equal_sign == NULL) {
1074 arg_len = strlen(argname);
1075 } else {
1076 arg_len = equal_sign - argname;
1077 }
1078
1079 // Only make the obsolete check for valid arguments.
1080 if (arg_len <= BUFLEN) {
1081 // Construct a string which consists only of the argument name without '+', '-', or '='.
1082 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1083 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1084 if (is_obsolete_flag(stripped_argname, &since)) {
1085 char version[256];
1086 since.to_string(version, sizeof(version));
1087 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1088 return true;
1089 }
1090 #ifndef PRODUCT
1091 else {
1092 const char* replacement;
1093 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1094 log_warning(arguments)("%s has been removed. Please use %s instead.",
1095 stripped_argname,
1096 replacement);
1097 return false;
1098 }
1099 }
1100 #endif //PRODUCT
1101 }
1102
1103 // For locked flags, report a custom error message if available.
1104 // Otherwise, report the standard unrecognized VM option.
1105 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1106 if (found_flag != NULL) {
1107 char locked_message_buf[BUFLEN];
1108 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1109 if (strlen(locked_message_buf) == 0) {
1110 if (found_flag->is_bool() && !has_plus_minus) {
1111 jio_fprintf(defaultStream::error_stream(),
1112 "Missing +/- setting for VM option '%s'\n", argname);
1113 } else if (!found_flag->is_bool() && has_plus_minus) {
1114 jio_fprintf(defaultStream::error_stream(),
1115 "Unexpected +/- setting in VM option '%s'\n", argname);
1116 } else {
1117 jio_fprintf(defaultStream::error_stream(),
1118 "Improperly specified VM option '%s'\n", argname);
1119 }
1120 } else {
1121 #ifdef PRODUCT
1122 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1123 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1124 if (ignore_unrecognized && mismatched) {
1125 return true;
1126 }
1127 #endif
1128 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1129 }
1130 } else {
1131 if (ignore_unrecognized) {
1132 return true;
1133 }
1134 jio_fprintf(defaultStream::error_stream(),
1135 "Unrecognized VM option '%s'\n", argname);
1136 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1137 if (fuzzy_matched != NULL) {
1138 jio_fprintf(defaultStream::error_stream(),
1139 "Did you mean '%s%s%s'? ",
1140 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1141 fuzzy_matched->_name,
1142 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1143 }
1144 }
1145
1146 // allow for commandline "commenting out" options like -XX:#+Verbose
1147 return arg[0] == '#';
1148 }
1149
1150 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1151 FILE* stream = fopen(file_name, "rb");
1152 if (stream == NULL) {
1153 if (should_exist) {
1154 jio_fprintf(defaultStream::error_stream(),
1155 "Could not open settings file %s\n", file_name);
1156 return false;
1157 } else {
1158 return true;
1159 }
1160 }
1161
1162 char token[1024];
1163 int pos = 0;
1164
1165 bool in_white_space = true;
1166 bool in_comment = false;
1167 bool in_quote = false;
1168 char quote_c = 0;
1169 bool result = true;
1170
1171 int c = getc(stream);
1172 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1173 if (in_white_space) {
1174 if (in_comment) {
1175 if (c == '\n') in_comment = false;
1176 } else {
1177 if (c == '#') in_comment = true;
1178 else if (!isspace(c)) {
1179 in_white_space = false;
1180 token[pos++] = c;
1181 }
1182 }
1183 } else {
1184 if (c == '\n' || (!in_quote && isspace(c))) {
1185 // token ends at newline, or at unquoted whitespace
1186 // this allows a way to include spaces in string-valued options
1187 token[pos] = '\0';
1188 logOption(token);
1189 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1190 build_jvm_flags(token);
1191 pos = 0;
1192 in_white_space = true;
1193 in_quote = false;
1194 } else if (!in_quote && (c == '\'' || c == '"')) {
1195 in_quote = true;
1196 quote_c = c;
1197 } else if (in_quote && (c == quote_c)) {
1198 in_quote = false;
1199 } else {
1200 token[pos++] = c;
1201 }
1202 }
1203 c = getc(stream);
1204 }
1205 if (pos > 0) {
1206 token[pos] = '\0';
1207 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1208 build_jvm_flags(token);
1209 }
1210 fclose(stream);
1211 return result;
1212 }
1213
1214 //=============================================================================================================
1215 // Parsing of properties (-D)
1216
1217 const char* Arguments::get_property(const char* key) {
1218 return PropertyList_get_value(system_properties(), key);
1219 }
1220
1221 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1222 const char* eq = strchr(prop, '=');
1223 const char* key;
1224 const char* value = "";
1225
1226 if (eq == NULL) {
1227 // property doesn't have a value, thus use passed string
1228 key = prop;
1229 } else {
1230 // property have a value, thus extract it and save to the
1231 // allocated string
1232 size_t key_len = eq - prop;
1233 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1234
1235 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1236 key = tmp_key;
1237
1238 value = &prop[key_len + 1];
1239 }
1240
1241 if (strcmp(key, "java.compiler") == 0) {
1242 process_java_compiler_argument(value);
1243 // Record value in Arguments, but let it get passed to Java.
1244 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1245 strcmp(key, "sun.java.launcher.pid") == 0) {
1246 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1247 // private and are processed in process_sun_java_launcher_properties();
1248 // the sun.java.launcher property is passed on to the java application
1249 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1250 // append is true, writable is true, internal is false
1251 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1252 WriteableProperty, ExternalProperty);
1253 } else {
1254 if (strcmp(key, "sun.java.command") == 0) {
1255 char *old_java_command = _java_command;
1256 _java_command = os::strdup_check_oom(value, mtArguments);
1257 if (old_java_command != NULL) {
1258 os::free(old_java_command);
1259 }
1260 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1261 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1262 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1263 // its value without going through the property list or making a Java call.
1264 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1265 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1266 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1267 os::free((void *)old_java_vendor_url_bug);
1268 }
1269 }
1270
1271 // Create new property and add at the end of the list
1272 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1273 }
1274
1275 if (key != prop) {
1276 // SystemProperty copy passed value, thus free previously allocated
1277 // memory
1278 FreeHeap((void *)key);
1279 }
1280
1281 return true;
1282 }
1283
1284 #if INCLUDE_CDS
1285 void Arguments::check_unsupported_dumping_properties() {
1286 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1287 const char* unsupported_properties[] = { "jdk.module.main",
1288 "jdk.module.limitmods",
1289 "jdk.module.path",
1290 "jdk.module.upgrade.path",
1291 "jdk.module.addmods.0",
1292 "jdk.module.patch.0" };
1293 const char* unsupported_options[] = { "-m", // cannot use at dump time
1294 "--limit-modules", // ignored at dump time
1295 "--module-path", // ignored at dump time
1296 "--upgrade-module-path", // ignored at dump time
1297 "--add-modules", // ignored at dump time
1298 "--patch-module" // ignored at dump time
1299 };
1300 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1301 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1302 // vm will exit with an error message. Otherwise, it will print an informational message if
1303 // -Xlog:cds is enabled.
1304 uint info_idx = 1;
1305 SystemProperty* sp = system_properties();
1306 while (sp != NULL) {
1307 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1308 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1309 if (i < info_idx) {
1310 vm_exit_during_initialization(
1311 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1312 } else {
1313 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1314 unsupported_options[i]);
1315 }
1316 }
1317 }
1318 sp = sp->next();
1319 }
1320
1321 // Check for an exploded module build in use with -Xshare:dump.
1322 if (!has_jimage()) {
1323 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1324 }
1325 }
1326 #endif
1327
1328 //===========================================================================================================
1329 // Setting int/mixed/comp mode flags
1330
1331 void Arguments::set_mode_flags(Mode mode) {
1332 // Set up default values for all flags.
1333 // If you add a flag to any of the branches below,
1334 // add a default value for it here.
1335 set_java_compiler(false);
1336 _mode = mode;
1337
1338 // Ensure Agent_OnLoad has the correct initial values.
1339 // This may not be the final mode; mode may change later in onload phase.
1340 PropertyList_unique_add(&_system_properties, "java.vm.info",
1341 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1342
1343 UseInterpreter = true;
1344 UseCompiler = true;
1345 UseLoopCounter = true;
1346
1347 // Default values may be platform/compiler dependent -
1348 // use the saved values
1349 ClipInlining = Arguments::_ClipInlining;
1350 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1351 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1352 BackgroundCompilation = Arguments::_BackgroundCompilation;
1353 if (TieredCompilation) {
1354 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1355 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1356 }
1357 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1358 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1359 }
1360 }
1361
1362 // Change from defaults based on mode
1363 switch (mode) {
1364 default:
1365 ShouldNotReachHere();
1366 break;
1367 case _int:
1368 UseCompiler = false;
1369 UseLoopCounter = false;
1370 AlwaysCompileLoopMethods = false;
1371 UseOnStackReplacement = false;
1372 break;
1373 case _mixed:
1374 // same as default
1375 break;
1376 case _comp:
1377 UseInterpreter = false;
1378 BackgroundCompilation = false;
1379 ClipInlining = false;
1380 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1381 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1382 // compile a level 4 (C2) and then continue executing it.
1383 if (TieredCompilation) {
1384 Tier3InvokeNotifyFreqLog = 0;
1385 Tier4InvocationThreshold = 0;
1386 }
1387 break;
1388 }
1389 }
1390
1391 // Conflict: required to use shared spaces (-Xshare:on), but
1392 // incompatible command line options were chosen.
1393 static void no_shared_spaces(const char* message) {
1394 if (RequireSharedSpaces) {
1395 jio_fprintf(defaultStream::error_stream(),
1396 "Class data sharing is inconsistent with other specified options.\n");
1397 vm_exit_during_initialization("Unable to use shared archive.", message);
1398 } else {
1399 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1400 }
1401 }
1402
1403 // Returns threshold scaled with the value of scale.
1404 // If scale < 0.0, threshold is returned without scaling.
1405 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1406 if (scale == 1.0 || scale < 0.0) {
1407 return threshold;
1408 } else {
1409 return (intx)(threshold * scale);
1410 }
1411 }
1412
1413 // Returns freq_log scaled with the value of scale.
1414 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1415 // If scale < 0.0, freq_log is returned without scaling.
1416 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1417 // Check if scaling is necessary or if negative value was specified.
1418 if (scale == 1.0 || scale < 0.0) {
1419 return freq_log;
1420 }
1421 // Check values to avoid calculating log2 of 0.
1422 if (scale == 0.0 || freq_log == 0) {
1423 return 0;
1424 }
1425 // Determine the maximum notification frequency value currently supported.
1426 // The largest mask value that the interpreter/C1 can handle is
1427 // of length InvocationCounter::number_of_count_bits. Mask values are always
1428 // one bit shorter then the value of the notification frequency. Set
1429 // max_freq_bits accordingly.
1430 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1431 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1432 if (scaled_freq == 0) {
1433 // Return 0 right away to avoid calculating log2 of 0.
1434 return 0;
1435 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1436 return max_freq_bits;
1437 } else {
1438 return log2_intptr(scaled_freq);
1439 }
1440 }
1441
1442 void Arguments::set_tiered_flags() {
1443 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1444 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1445 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1446 }
1447 if (CompilationPolicyChoice < 2) {
1448 vm_exit_during_initialization(
1449 "Incompatible compilation policy selected", NULL);
1450 }
1451 // Increase the code cache size - tiered compiles a lot more.
1452 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1453 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1454 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1455 }
1456 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1457 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1458 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1459 }
1460 if (!UseInterpreter) { // -Xcomp
1461 Tier3InvokeNotifyFreqLog = 0;
1462 Tier4InvocationThreshold = 0;
1463 }
1464
1465 if (CompileThresholdScaling < 0) {
1466 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1467 }
1468
1469 // Scale tiered compilation thresholds.
1470 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1471 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1472 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1473 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1474
1475 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1476 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1477 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1478 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1479
1480 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1481 // once these thresholds become supported.
1482
1483 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1484 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1485
1486 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1487 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1488
1489 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1490
1491 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1492 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1493 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1494 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1495 }
1496 }
1497
1498 #if INCLUDE_ALL_GCS
1499 static void disable_adaptive_size_policy(const char* collector_name) {
1500 if (UseAdaptiveSizePolicy) {
1501 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1502 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1503 collector_name);
1504 }
1505 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1506 }
1507 }
1508
1509 void Arguments::set_parnew_gc_flags() {
1510 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1511 "control point invariant");
1512 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1513
1514 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1515 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1516 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1517 } else if (ParallelGCThreads == 0) {
1518 jio_fprintf(defaultStream::error_stream(),
1519 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1520 vm_exit(1);
1521 }
1522
1523 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1524 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1525 // we set them to 1024 and 1024.
1526 // See CR 6362902.
1527 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1528 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1529 }
1530 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1531 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1532 }
1533
1534 // When using compressed oops, we use local overflow stacks,
1535 // rather than using a global overflow list chained through
1536 // the klass word of the object's pre-image.
1537 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1538 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1539 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1540 }
1541 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1542 }
1543 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1544 }
1545
1546 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1547 // sparc/solaris for certain applications, but would gain from
1548 // further optimization and tuning efforts, and would almost
1549 // certainly gain from analysis of platform and environment.
1550 void Arguments::set_cms_and_parnew_gc_flags() {
1551 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1552 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1553
1554 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1555 disable_adaptive_size_policy("UseConcMarkSweepGC");
1556
1557 set_parnew_gc_flags();
1558
1559 size_t max_heap = align_down(MaxHeapSize,
1560 CardTableRS::ct_max_alignment_constraint());
1561
1562 // Now make adjustments for CMS
1563 intx tenuring_default = (intx)6;
1564 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1565
1566 // Preferred young gen size for "short" pauses:
1567 // upper bound depends on # of threads and NewRatio.
1568 const size_t preferred_max_new_size_unaligned =
1569 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1570 size_t preferred_max_new_size =
1571 align_up(preferred_max_new_size_unaligned, os::vm_page_size());
1572
1573 // Unless explicitly requested otherwise, size young gen
1574 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1575
1576 // If either MaxNewSize or NewRatio is set on the command line,
1577 // assume the user is trying to set the size of the young gen.
1578 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1579
1580 // Set MaxNewSize to our calculated preferred_max_new_size unless
1581 // NewSize was set on the command line and it is larger than
1582 // preferred_max_new_size.
1583 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1584 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1585 } else {
1586 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1587 }
1588 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1589
1590 // Code along this path potentially sets NewSize and OldSize
1591 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1592 min_heap_size(), InitialHeapSize, max_heap);
1593 size_t min_new = preferred_max_new_size;
1594 if (FLAG_IS_CMDLINE(NewSize)) {
1595 min_new = NewSize;
1596 }
1597 if (max_heap > min_new && min_heap_size() > min_new) {
1598 // Unless explicitly requested otherwise, make young gen
1599 // at least min_new, and at most preferred_max_new_size.
1600 if (FLAG_IS_DEFAULT(NewSize)) {
1601 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1602 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1603 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1604 }
1605 // Unless explicitly requested otherwise, size old gen
1606 // so it's NewRatio x of NewSize.
1607 if (FLAG_IS_DEFAULT(OldSize)) {
1608 if (max_heap > NewSize) {
1609 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1610 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1611 }
1612 }
1613 }
1614 }
1615 // Unless explicitly requested otherwise, definitely
1616 // promote all objects surviving "tenuring_default" scavenges.
1617 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1618 FLAG_IS_DEFAULT(SurvivorRatio)) {
1619 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1620 }
1621 // If we decided above (or user explicitly requested)
1622 // `promote all' (via MaxTenuringThreshold := 0),
1623 // prefer minuscule survivor spaces so as not to waste
1624 // space for (non-existent) survivors
1625 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1626 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1627 }
1628
1629 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1630 // but rather the number of free blocks of a given size that are used when
1631 // replenishing the local per-worker free list caches.
1632 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1633 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1634 // OldPLAB sizing manually turned off: Use a larger default setting,
1635 // unless it was manually specified. This is because a too-low value
1636 // will slow down scavenges.
1637 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1638 } else {
1639 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1640 }
1641 }
1642
1643 // If either of the static initialization defaults have changed, note this
1644 // modification.
1645 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1646 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1647 }
1648
1649 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1650 }
1651 #endif // INCLUDE_ALL_GCS
1652
1653 void set_object_alignment() {
1654 // Object alignment.
1655 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1656 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1657 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1658 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1659 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1660 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1661
1662 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1663 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1664
1665 // Oop encoding heap max
1666 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1667
1668 if (SurvivorAlignmentInBytes == 0) {
1669 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1670 }
1671
1672 #if INCLUDE_ALL_GCS
1673 // Set CMS global values
1674 CompactibleFreeListSpace::set_cms_values();
1675 #endif // INCLUDE_ALL_GCS
1676 }
1677
1678 size_t Arguments::max_heap_for_compressed_oops() {
1679 // Avoid sign flip.
1680 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1681 // We need to fit both the NULL page and the heap into the memory budget, while
1682 // keeping alignment constraints of the heap. To guarantee the latter, as the
1683 // NULL page is located before the heap, we pad the NULL page to the conservative
1684 // maximum alignment that the GC may ever impose upon the heap.
1685 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1686 _conservative_max_heap_alignment);
1687
1688 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1689 NOT_LP64(ShouldNotReachHere(); return 0);
1690 }
1691
1692 void Arguments::set_use_compressed_oops() {
1693 #ifndef ZERO
1694 #ifdef _LP64
1695 // MaxHeapSize is not set up properly at this point, but
1696 // the only value that can override MaxHeapSize if we are
1697 // to use UseCompressedOops is InitialHeapSize.
1698 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1699
1700 if (max_heap_size <= max_heap_for_compressed_oops()) {
1701 #if !defined(COMPILER1) || defined(TIERED)
1702 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1703 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1704 }
1705 #endif
1706 } else {
1707 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1708 warning("Max heap size too large for Compressed Oops");
1709 FLAG_SET_DEFAULT(UseCompressedOops, false);
1710 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1711 }
1712 }
1713 #endif // _LP64
1714 #endif // ZERO
1715 }
1716
1717
1718 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1719 // set_use_compressed_oops().
1720 void Arguments::set_use_compressed_klass_ptrs() {
1721 #ifndef ZERO
1722 #ifdef _LP64
1723 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1724 if (!UseCompressedOops) {
1725 if (UseCompressedClassPointers) {
1726 warning("UseCompressedClassPointers requires UseCompressedOops");
1727 }
1728 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1729 } else {
1730 // Turn on UseCompressedClassPointers too
1731 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1732 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1733 }
1734 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1735 if (UseCompressedClassPointers) {
1736 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1737 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1738 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1739 }
1740 }
1741 }
1742 #endif // _LP64
1743 #endif // !ZERO
1744 }
1745
1746 void Arguments::set_conservative_max_heap_alignment() {
1747 // The conservative maximum required alignment for the heap is the maximum of
1748 // the alignments imposed by several sources: any requirements from the heap
1749 // itself, the collector policy and the maximum page size we may run the VM
1750 // with.
1751 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1752 #if INCLUDE_ALL_GCS
1753 if (UseParallelGC) {
1754 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1755 } else if (UseG1GC) {
1756 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1757 }
1758 #endif // INCLUDE_ALL_GCS
1759 _conservative_max_heap_alignment = MAX4(heap_alignment,
1760 (size_t)os::vm_allocation_granularity(),
1761 os::max_page_size(),
1762 CollectorPolicy::compute_heap_alignment());
1763 }
1764
1765 bool Arguments::gc_selected() {
1766 #if INCLUDE_ALL_GCS
1767 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1768 #else
1769 return UseSerialGC;
1770 #endif // INCLUDE_ALL_GCS
1771 }
1772
1773 #ifdef TIERED
1774 bool Arguments::compilation_mode_selected() {
1775 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1776 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1777
1778 }
1779
1780 void Arguments::select_compilation_mode_ergonomically() {
1781 #if defined(_WINDOWS) && !defined(_LP64)
1782 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1783 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1784 }
1785 #endif
1786 if (NeverActAsServerClassMachine) {
1787 set_client_compilation_mode();
1788 }
1789 }
1790 #endif //TIERED
1791
1792 void Arguments::select_gc_ergonomically() {
1793 #if INCLUDE_ALL_GCS
1794 if (os::is_server_class_machine()) {
1795 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1796 } else {
1797 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1798 }
1799 #else
1800 UNSUPPORTED_OPTION(UseG1GC);
1801 UNSUPPORTED_OPTION(UseParallelGC);
1802 UNSUPPORTED_OPTION(UseParallelOldGC);
1803 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1804 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1805 #endif // INCLUDE_ALL_GCS
1806 }
1807
1808 void Arguments::select_gc() {
1809 if (!gc_selected()) {
1810 select_gc_ergonomically();
1811 if (!gc_selected()) {
1812 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1813 }
1814 }
1815 }
1816
1817 #if INCLUDE_JVMCI
1818 void Arguments::set_jvmci_specific_flags() {
1819 if (UseJVMCICompiler) {
1820 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1821 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1822 }
1823 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1824 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1825 }
1826 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1827 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1828 }
1829 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1830 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1831 }
1832 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1833 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1834 }
1835 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1836 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1837 }
1838 if (TieredStopAtLevel != CompLevel_full_optimization) {
1839 // Currently JVMCI compiler can only work at the full optimization level
1840 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1841 TieredStopAtLevel = CompLevel_full_optimization;
1842 }
1843 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1844 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1845 }
1846 }
1847 }
1848 #endif
1849
1850 void Arguments::set_ergonomics_flags() {
1851 #ifdef TIERED
1852 if (!compilation_mode_selected()) {
1853 select_compilation_mode_ergonomically();
1854 }
1855 #endif
1856 select_gc();
1857
1858 #if defined(COMPILER2) || INCLUDE_JVMCI
1859 // Shared spaces work fine with other GCs but causes bytecode rewriting
1860 // to be disabled, which hurts interpreter performance and decreases
1861 // server performance. When -server is specified, keep the default off
1862 // unless it is asked for. Future work: either add bytecode rewriting
1863 // at link time, or rewrite bytecodes in non-shared methods.
1864 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1865 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1866 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1867 }
1868 #endif
1869
1870 set_conservative_max_heap_alignment();
1871
1872 #ifndef ZERO
1873 #ifdef _LP64
1874 set_use_compressed_oops();
1875
1876 // set_use_compressed_klass_ptrs() must be called after calling
1877 // set_use_compressed_oops().
1878 set_use_compressed_klass_ptrs();
1879
1880 // Also checks that certain machines are slower with compressed oops
1881 // in vm_version initialization code.
1882 #endif // _LP64
1883 #endif // !ZERO
1884
1885 }
1886
1887 void Arguments::set_parallel_gc_flags() {
1888 assert(UseParallelGC || UseParallelOldGC, "Error");
1889 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1890 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1891 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1892 }
1893 FLAG_SET_DEFAULT(UseParallelGC, true);
1894
1895 // If no heap maximum was requested explicitly, use some reasonable fraction
1896 // of the physical memory, up to a maximum of 1GB.
1897 FLAG_SET_DEFAULT(ParallelGCThreads,
1898 Abstract_VM_Version::parallel_worker_threads());
1899 if (ParallelGCThreads == 0) {
1900 jio_fprintf(defaultStream::error_stream(),
1901 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1902 vm_exit(1);
1903 }
1904
1905 if (UseAdaptiveSizePolicy) {
1906 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1907 // unless the user actually sets these flags.
1908 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1909 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1910 }
1911 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1912 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1913 }
1914 }
1915
1916 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1917 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1918 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1919 // See CR 6362902 for details.
1920 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1921 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1922 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1923 }
1924 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1925 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1926 }
1927 }
1928
1929 if (UseParallelOldGC) {
1930 // Par compact uses lower default values since they are treated as
1931 // minimums. These are different defaults because of the different
1932 // interpretation and are not ergonomically set.
1933 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1934 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1935 }
1936 }
1937 }
1938
1939 void Arguments::set_g1_gc_flags() {
1940 assert(UseG1GC, "Error");
1941 #if defined(COMPILER1) || INCLUDE_JVMCI
1942 FastTLABRefill = false;
1943 #endif
1944 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1945 if (ParallelGCThreads == 0) {
1946 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1947 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1948 }
1949
1950 #if INCLUDE_ALL_GCS
1951 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1952 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1953 }
1954 #endif
1955
1956 // MarkStackSize will be set (if it hasn't been set by the user)
1957 // when concurrent marking is initialized.
1958 // Its value will be based upon the number of parallel marking threads.
1959 // But we do set the maximum mark stack size here.
1960 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1961 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1962 }
1963
1964 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1965 // In G1, we want the default GC overhead goal to be higher than
1966 // it is for PS, or the heap might be expanded too aggressively.
1967 // We set it here to ~8%.
1968 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1969 }
1970
1971 // Below, we might need to calculate the pause time interval based on
1972 // the pause target. When we do so we are going to give G1 maximum
1973 // flexibility and allow it to do pauses when it needs to. So, we'll
1974 // arrange that the pause interval to be pause time target + 1 to
1975 // ensure that a) the pause time target is maximized with respect to
1976 // the pause interval and b) we maintain the invariant that pause
1977 // time target < pause interval. If the user does not want this
1978 // maximum flexibility, they will have to set the pause interval
1979 // explicitly.
1980
1981 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1982 // The default pause time target in G1 is 200ms
1983 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1984 }
1985
1986 // Then, if the interval parameter was not set, set it according to
1987 // the pause time target (this will also deal with the case when the
1988 // pause time target is the default value).
1989 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1990 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1991 }
1992
1993 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1994 }
1995
1996 void Arguments::set_gc_specific_flags() {
1997 #if INCLUDE_ALL_GCS
1998 // Set per-collector flags
1999 if (UseParallelGC || UseParallelOldGC) {
2000 set_parallel_gc_flags();
2001 } else if (UseConcMarkSweepGC) {
2002 set_cms_and_parnew_gc_flags();
2003 } else if (UseG1GC) {
2004 set_g1_gc_flags();
2005 }
2006 if (AssumeMP && !UseSerialGC) {
2007 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2008 warning("If the number of processors is expected to increase from one, then"
2009 " you should configure the number of parallel GC threads appropriately"
2010 " using -XX:ParallelGCThreads=N");
2011 }
2012 }
2013 if (MinHeapFreeRatio == 100) {
2014 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2015 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2016 }
2017
2018 // If class unloading is disabled, also disable concurrent class unloading.
2019 if (!ClassUnloading) {
2020 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2021 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2022 }
2023 #endif // INCLUDE_ALL_GCS
2024 }
2025
2026 julong Arguments::limit_by_allocatable_memory(julong limit) {
2027 julong max_allocatable;
2028 julong result = limit;
2029 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2030 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2031 }
2032 return result;
2033 }
2034
2035 // Use static initialization to get the default before parsing
2036 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2037
2038 void Arguments::set_heap_size() {
2039 julong phys_mem =
2040 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2041 : (julong)MaxRAM;
2042
2043 // Experimental support for CGroup memory limits
2044 if (UseCGroupMemoryLimitForHeap) {
2045 // This is a rough indicator that a CGroup limit may be in force
2046 // for this process
2047 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
2048 FILE *fp = fopen(lim_file, "r");
2049 if (fp != NULL) {
2050 julong cgroup_max = 0;
2051 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2052 if (ret == 1 && cgroup_max > 0) {
2053 // If unlimited, cgroup_max will be a very large, but unspecified
2054 // value, so use initial phys_mem as a limit
2055 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
2056 JULONG_FORMAT "MB) and initial phys_mem ("
2057 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2058 phys_mem = MIN2(cgroup_max, phys_mem);
2059 } else {
2060 warning("Unable to read/parse cgroup memory limit from %s: %s",
2061 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2062 }
2063 fclose(fp);
2064 } else {
2065 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2066 }
2067 }
2068
2069 // If the maximum heap size has not been set with -Xmx,
2070 // then set it as fraction of the size of physical memory,
2071 // respecting the maximum and minimum sizes of the heap.
2072 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2073 julong reasonable_max = phys_mem / MaxRAMFraction;
2074
2075 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2076 // Small physical memory, so use a minimum fraction of it for the heap
2077 reasonable_max = phys_mem / MinRAMFraction;
2078 } else {
2079 // Not-small physical memory, so require a heap at least
2080 // as large as MaxHeapSize
2081 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2082 }
2083 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2084 // Limit the heap size to ErgoHeapSizeLimit
2085 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2086 }
2087 if (UseCompressedOops) {
2088 // Limit the heap size to the maximum possible when using compressed oops
2089 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2090
2091 // HeapBaseMinAddress can be greater than default but not less than.
2092 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2093 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2094 // matches compressed oops printing flags
2095 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2096 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2097 DefaultHeapBaseMinAddress,
2098 DefaultHeapBaseMinAddress/G,
2099 HeapBaseMinAddress);
2100 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2101 }
2102 }
2103
2104 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2105 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2106 // but it should be not less than default MaxHeapSize.
2107 max_coop_heap -= HeapBaseMinAddress;
2108 }
2109 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2110 }
2111 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2112
2113 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2114 // An initial heap size was specified on the command line,
2115 // so be sure that the maximum size is consistent. Done
2116 // after call to limit_by_allocatable_memory because that
2117 // method might reduce the allocation size.
2118 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2119 }
2120
2121 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2122 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2123 }
2124
2125 // If the minimum or initial heap_size have not been set or requested to be set
2126 // ergonomically, set them accordingly.
2127 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2128 julong reasonable_minimum = (julong)(OldSize + NewSize);
2129
2130 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2131
2132 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2133
2134 if (InitialHeapSize == 0) {
2135 julong reasonable_initial = phys_mem / InitialRAMFraction;
2136
2137 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2138 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2139
2140 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2141
2142 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2143 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2144 }
2145 // If the minimum heap size has not been set (via -Xms),
2146 // synchronize with InitialHeapSize to avoid errors with the default value.
2147 if (min_heap_size() == 0) {
2148 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2149 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2150 }
2151 }
2152 }
2153
2154 // This option inspects the machine and attempts to set various
2155 // parameters to be optimal for long-running, memory allocation
2156 // intensive jobs. It is intended for machines with large
2157 // amounts of cpu and memory.
2158 jint Arguments::set_aggressive_heap_flags() {
2159 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2160 // VM, but we may not be able to represent the total physical memory
2161 // available (like having 8gb of memory on a box but using a 32bit VM).
2162 // Thus, we need to make sure we're using a julong for intermediate
2163 // calculations.
2164 julong initHeapSize;
2165 julong total_memory = os::physical_memory();
2166
2167 if (total_memory < (julong) 256 * M) {
2168 jio_fprintf(defaultStream::error_stream(),
2169 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2170 vm_exit(1);
2171 }
2172
2173 // The heap size is half of available memory, or (at most)
2174 // all of possible memory less 160mb (leaving room for the OS
2175 // when using ISM). This is the maximum; because adaptive sizing
2176 // is turned on below, the actual space used may be smaller.
2177
2178 initHeapSize = MIN2(total_memory / (julong) 2,
2179 total_memory - (julong) 160 * M);
2180
2181 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2182
2183 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2184 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2185 return JNI_EINVAL;
2186 }
2187 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2188 return JNI_EINVAL;
2189 }
2190 // Currently the minimum size and the initial heap sizes are the same.
2191 set_min_heap_size(initHeapSize);
2192 }
2193 if (FLAG_IS_DEFAULT(NewSize)) {
2194 // Make the young generation 3/8ths of the total heap.
2195 if (FLAG_SET_CMDLINE(size_t, NewSize,
2196 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2197 return JNI_EINVAL;
2198 }
2199 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2200 return JNI_EINVAL;
2201 }
2202 }
2203
2204 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2205 FLAG_SET_DEFAULT(UseLargePages, true);
2206 #endif
2207
2208 // Increase some data structure sizes for efficiency
2209 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2210 return JNI_EINVAL;
2211 }
2212 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2213 return JNI_EINVAL;
2214 }
2215 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2216 return JNI_EINVAL;
2217 }
2218
2219 // See the OldPLABSize comment below, but replace 'after promotion'
2220 // with 'after copying'. YoungPLABSize is the size of the survivor
2221 // space per-gc-thread buffers. The default is 4kw.
2222 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2223 return JNI_EINVAL;
2224 }
2225
2226 // OldPLABSize is the size of the buffers in the old gen that
2227 // UseParallelGC uses to promote live data that doesn't fit in the
2228 // survivor spaces. At any given time, there's one for each gc thread.
2229 // The default size is 1kw. These buffers are rarely used, since the
2230 // survivor spaces are usually big enough. For specjbb, however, there
2231 // are occasions when there's lots of live data in the young gen
2232 // and we end up promoting some of it. We don't have a definite
2233 // explanation for why bumping OldPLABSize helps, but the theory
2234 // is that a bigger PLAB results in retaining something like the
2235 // original allocation order after promotion, which improves mutator
2236 // locality. A minor effect may be that larger PLABs reduce the
2237 // number of PLAB allocation events during gc. The value of 8kw
2238 // was arrived at by experimenting with specjbb.
2239 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2240 return JNI_EINVAL;
2241 }
2242
2243 // Enable parallel GC and adaptive generation sizing
2244 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2245 return JNI_EINVAL;
2246 }
2247
2248 // Encourage steady state memory management
2249 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2250 return JNI_EINVAL;
2251 }
2252
2253 // This appears to improve mutator locality
2254 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2255 return JNI_EINVAL;
2256 }
2257
2258 // Get around early Solaris scheduling bug
2259 // (affinity vs other jobs on system)
2260 // but disallow DR and offlining (5008695).
2261 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2262 return JNI_EINVAL;
2263 }
2264
2265 return JNI_OK;
2266 }
2267
2268 // This must be called after ergonomics.
2269 void Arguments::set_bytecode_flags() {
2270 if (!RewriteBytecodes) {
2271 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2272 }
2273 }
2274
2275 // Aggressive optimization flags -XX:+AggressiveOpts
2276 jint Arguments::set_aggressive_opts_flags() {
2277 #ifdef COMPILER2
2278 if (AggressiveUnboxing) {
2279 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2280 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2281 } else if (!EliminateAutoBox) {
2282 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2283 AggressiveUnboxing = false;
2284 }
2285 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2286 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2287 } else if (!DoEscapeAnalysis) {
2288 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2289 AggressiveUnboxing = false;
2290 }
2291 }
2292 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2293 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2294 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2295 }
2296 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2297 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2298 }
2299
2300 // Feed the cache size setting into the JDK
2301 char buffer[1024];
2302 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2303 if (!add_property(buffer)) {
2304 return JNI_ENOMEM;
2305 }
2306 }
2307 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2308 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2309 }
2310 #endif
2311
2312 if (AggressiveOpts) {
2313 // Sample flag setting code
2314 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2315 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2316 // }
2317 }
2318
2319 return JNI_OK;
2320 }
2321
2322 //===========================================================================================================
2323 // Parsing of java.compiler property
2324
2325 void Arguments::process_java_compiler_argument(const char* arg) {
2326 // For backwards compatibility, Djava.compiler=NONE or ""
2327 // causes us to switch to -Xint mode UNLESS -Xdebug
2328 // is also specified.
2329 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2330 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2331 }
2332 }
2333
2334 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2335 _sun_java_launcher = os::strdup_check_oom(launcher);
2336 }
2337
2338 bool Arguments::created_by_java_launcher() {
2339 assert(_sun_java_launcher != NULL, "property must have value");
2340 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2341 }
2342
2343 bool Arguments::sun_java_launcher_is_altjvm() {
2344 return _sun_java_launcher_is_altjvm;
2345 }
2346
2347 //===========================================================================================================
2348 // Parsing of main arguments
2349
2350 #if INCLUDE_JVMCI
2351 // Check consistency of jvmci vm argument settings.
2352 bool Arguments::check_jvmci_args_consistency() {
2353 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2354 }
2355 #endif //INCLUDE_JVMCI
2356
2357 // Check consistency of GC selection
2358 bool Arguments::check_gc_consistency() {
2359 // Ensure that the user has not selected conflicting sets
2360 // of collectors.
2361 uint i = 0;
2362 if (UseSerialGC) i++;
2363 if (UseConcMarkSweepGC) i++;
2364 if (UseParallelGC || UseParallelOldGC) i++;
2365 if (UseG1GC) i++;
2366 if (i > 1) {
2367 jio_fprintf(defaultStream::error_stream(),
2368 "Conflicting collector combinations in option list; "
2369 "please refer to the release notes for the combinations "
2370 "allowed\n");
2371 return false;
2372 }
2373
2374 return true;
2375 }
2376
2377 // Check the consistency of vm_init_args
2378 bool Arguments::check_vm_args_consistency() {
2379 // Method for adding checks for flag consistency.
2380 // The intent is to warn the user of all possible conflicts,
2381 // before returning an error.
2382 // Note: Needs platform-dependent factoring.
2383 bool status = true;
2384
2385 if (TLABRefillWasteFraction == 0) {
2386 jio_fprintf(defaultStream::error_stream(),
2387 "TLABRefillWasteFraction should be a denominator, "
2388 "not " SIZE_FORMAT "\n",
2389 TLABRefillWasteFraction);
2390 status = false;
2391 }
2392
2393 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2394 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2395 }
2396
2397 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2398 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2399 }
2400
2401 if (GCTimeLimit == 100) {
2402 // Turn off gc-overhead-limit-exceeded checks
2403 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2404 }
2405
2406 status = status && check_gc_consistency();
2407
2408 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2409 // insists that we hold the requisite locks so that the iteration is
2410 // MT-safe. For the verification at start-up and shut-down, we don't
2411 // yet have a good way of acquiring and releasing these locks,
2412 // which are not visible at the CollectedHeap level. We want to
2413 // be able to acquire these locks and then do the iteration rather
2414 // than just disable the lock verification. This will be fixed under
2415 // bug 4788986.
2416 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2417 if (VerifyDuringStartup) {
2418 warning("Heap verification at start-up disabled "
2419 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2420 VerifyDuringStartup = false; // Disable verification at start-up
2421 }
2422
2423 if (VerifyBeforeExit) {
2424 warning("Heap verification at shutdown disabled "
2425 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2426 VerifyBeforeExit = false; // Disable verification at shutdown
2427 }
2428 }
2429
2430 if (PrintNMTStatistics) {
2431 #if INCLUDE_NMT
2432 if (MemTracker::tracking_level() == NMT_off) {
2433 #endif // INCLUDE_NMT
2434 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2435 PrintNMTStatistics = false;
2436 #if INCLUDE_NMT
2437 }
2438 #endif
2439 }
2440
2441 #if INCLUDE_JVMCI
2442 status = status && check_jvmci_args_consistency();
2443
2444 if (EnableJVMCI) {
2445 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2446 AddProperty, UnwriteableProperty, InternalProperty);
2447
2448 if (!ScavengeRootsInCode) {
2449 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2450 ScavengeRootsInCode = 1;
2451 }
2452 }
2453 #endif
2454
2455 // Check lower bounds of the code cache
2456 // Template Interpreter code is approximately 3X larger in debug builds.
2457 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2458 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2459 jio_fprintf(defaultStream::error_stream(),
2460 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2461 os::vm_page_size()/K);
2462 status = false;
2463 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2466 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2467 status = false;
2468 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2469 jio_fprintf(defaultStream::error_stream(),
2470 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2471 min_code_cache_size/K);
2472 status = false;
2473 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2474 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2477 CODE_CACHE_SIZE_LIMIT/M);
2478 status = false;
2479 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2480 jio_fprintf(defaultStream::error_stream(),
2481 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2482 min_code_cache_size/K);
2483 status = false;
2484 }
2485
2486 #ifdef _LP64
2487 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2488 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2489 }
2490 #endif
2491
2492 #ifndef SUPPORT_RESERVED_STACK_AREA
2493 if (StackReservedPages != 0) {
2494 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2495 warning("Reserved Stack Area not supported on this platform");
2496 }
2497 #endif
2498
2499 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2500 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2501 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2502 }
2503 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2504 }
2505 if (UseCompiler && is_interpreter_only()) {
2506 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2507 warning("UseCompiler disabled due to -Xint.");
2508 }
2509 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2510 }
2511 #ifdef COMPILER2
2512 if (PostLoopMultiversioning && !RangeCheckElimination) {
2513 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2514 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2515 }
2516 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2517 }
2518 #endif
2519 return status;
2520 }
2521
2522 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2523 const char* option_type) {
2524 if (ignore) return false;
2525
2526 const char* spacer = " ";
2527 if (option_type == NULL) {
2528 option_type = ++spacer; // Set both to the empty string.
2529 }
2530
2531 if (os::obsolete_option(option)) {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Obsolete %s%soption: %s\n", option_type, spacer,
2534 option->optionString);
2535 return false;
2536 } else {
2537 jio_fprintf(defaultStream::error_stream(),
2538 "Unrecognized %s%soption: %s\n", option_type, spacer,
2539 option->optionString);
2540 return true;
2541 }
2542 }
2543
2544 static const char* user_assertion_options[] = {
2545 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2546 };
2547
2548 static const char* system_assertion_options[] = {
2549 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2550 };
2551
2552 bool Arguments::parse_uintx(const char* value,
2553 uintx* uintx_arg,
2554 uintx min_size) {
2555
2556 // Check the sign first since atojulong() parses only unsigned values.
2557 bool value_is_positive = !(*value == '-');
2558
2559 if (value_is_positive) {
2560 julong n;
2561 bool good_return = atojulong(value, &n);
2562 if (good_return) {
2563 bool above_minimum = n >= min_size;
2564 bool value_is_too_large = n > max_uintx;
2565
2566 if (above_minimum && !value_is_too_large) {
2567 *uintx_arg = n;
2568 return true;
2569 }
2570 }
2571 }
2572 return false;
2573 }
2574
2575 unsigned int addreads_count = 0;
2576 unsigned int addexports_count = 0;
2577 unsigned int addopens_count = 0;
2578 unsigned int addmods_count = 0;
2579 unsigned int patch_mod_count = 0;
2580
2581 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2582 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2583 char* property = AllocateHeap(prop_len, mtArguments);
2584 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2585 if (ret < 0 || ret >= (int)prop_len) {
2586 FreeHeap(property);
2587 return false;
2588 }
2589 bool added = add_property(property, UnwriteableProperty, internal);
2590 FreeHeap(property);
2591 return added;
2592 }
2593
2594 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2595 const unsigned int props_count_limit = 1000;
2596 const int max_digits = 3;
2597 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2598
2599 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2600 if (count < props_count_limit) {
2601 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2602 char* property = AllocateHeap(prop_len, mtArguments);
2603 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2604 if (ret < 0 || ret >= (int)prop_len) {
2605 FreeHeap(property);
2606 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2607 return false;
2608 }
2609 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2610 FreeHeap(property);
2611 return added;
2612 }
2613
2614 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2615 return false;
2616 }
2617
2618 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2619 julong* long_arg,
2620 julong min_size,
2621 julong max_size) {
2622 if (!atojulong(s, long_arg)) return arg_unreadable;
2623 return check_memory_size(*long_arg, min_size, max_size);
2624 }
2625
2626 // Parse JavaVMInitArgs structure
2627
2628 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2629 const JavaVMInitArgs *java_options_args,
2630 const JavaVMInitArgs *cmd_line_args) {
2631 bool patch_mod_javabase = false;
2632
2633 // Save default settings for some mode flags
2634 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2635 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2636 Arguments::_ClipInlining = ClipInlining;
2637 Arguments::_BackgroundCompilation = BackgroundCompilation;
2638 if (TieredCompilation) {
2639 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2640 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2641 }
2642
2643 // Setup flags for mixed which is the default
2644 set_mode_flags(_mixed);
2645
2646 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2647 // variable (if present).
2648 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2649 if (result != JNI_OK) {
2650 return result;
2651 }
2652
2653 // Parse args structure generated from the command line flags.
2654 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2655 if (result != JNI_OK) {
2656 return result;
2657 }
2658
2659 // Parse args structure generated from the _JAVA_OPTIONS environment
2660 // variable (if present) (mimics classic VM)
2661 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2662 if (result != JNI_OK) {
2663 return result;
2664 }
2665
2666 // Do final processing now that all arguments have been parsed
2667 result = finalize_vm_init_args();
2668 if (result != JNI_OK) {
2669 return result;
2670 }
2671
2672 #if INCLUDE_CDS
2673 if (UseSharedSpaces && patch_mod_javabase) {
2674 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2675 }
2676 #endif
2677
2678 return JNI_OK;
2679 }
2680
2681 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2682 // represents a valid JDWP agent. is_path==true denotes that we
2683 // are dealing with -agentpath (case where name is a path), otherwise with
2684 // -agentlib
2685 bool valid_jdwp_agent(char *name, bool is_path) {
2686 char *_name;
2687 const char *_jdwp = "jdwp";
2688 size_t _len_jdwp, _len_prefix;
2689
2690 if (is_path) {
2691 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2692 return false;
2693 }
2694
2695 _name++; // skip past last path separator
2696 _len_prefix = strlen(JNI_LIB_PREFIX);
2697
2698 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2699 return false;
2700 }
2701
2702 _name += _len_prefix;
2703 _len_jdwp = strlen(_jdwp);
2704
2705 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2706 _name += _len_jdwp;
2707 }
2708 else {
2709 return false;
2710 }
2711
2712 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2713 return false;
2714 }
2715
2716 return true;
2717 }
2718
2719 if (strcmp(name, _jdwp) == 0) {
2720 return true;
2721 }
2722
2723 return false;
2724 }
2725
2726 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2727 // --patch-module=<module>=<file>(<pathsep><file>)*
2728 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2729 // Find the equal sign between the module name and the path specification
2730 const char* module_equal = strchr(patch_mod_tail, '=');
2731 if (module_equal == NULL) {
2732 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2733 return JNI_ERR;
2734 } else {
2735 // Pick out the module name
2736 size_t module_len = module_equal - patch_mod_tail;
2737 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2738 if (module_name != NULL) {
2739 memcpy(module_name, patch_mod_tail, module_len);
2740 *(module_name + module_len) = '\0';
2741 // The path piece begins one past the module_equal sign
2742 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2743 FREE_C_HEAP_ARRAY(char, module_name);
2744 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2745 return JNI_ENOMEM;
2746 }
2747 } else {
2748 return JNI_ENOMEM;
2749 }
2750 }
2751 return JNI_OK;
2752 }
2753
2754 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2755 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2756 // The min and max sizes match the values in globals.hpp, but scaled
2757 // with K. The values have been chosen so that alignment with page
2758 // size doesn't change the max value, which makes the conversions
2759 // back and forth between Xss value and ThreadStackSize value easier.
2760 // The values have also been chosen to fit inside a 32-bit signed type.
2761 const julong min_ThreadStackSize = 0;
2762 const julong max_ThreadStackSize = 1 * M;
2763
2764 const julong min_size = min_ThreadStackSize * K;
2765 const julong max_size = max_ThreadStackSize * K;
2766
2767 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2768
2769 julong size = 0;
2770 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2771 if (errcode != arg_in_range) {
2772 bool silent = (option == NULL); // Allow testing to silence error messages
2773 if (!silent) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Invalid thread stack size: %s\n", option->optionString);
2776 describe_range_error(errcode);
2777 }
2778 return JNI_EINVAL;
2779 }
2780
2781 // Internally track ThreadStackSize in units of 1024 bytes.
2782 const julong size_aligned = align_up(size, K);
2783 assert(size <= size_aligned,
2784 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2785 size, size_aligned);
2786
2787 const julong size_in_K = size_aligned / K;
2788 assert(size_in_K < (julong)max_intx,
2789 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2790 size_in_K);
2791
2792 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2793 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2794 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2795 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2796 max_expanded, size_in_K);
2797
2798 *out_ThreadStackSize = (intx)size_in_K;
2799
2800 return JNI_OK;
2801 }
2802
2803 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2804 // For match_option to return remaining or value part of option string
2805 const char* tail;
2806
2807 // iterate over arguments
2808 for (int index = 0; index < args->nOptions; index++) {
2809 bool is_absolute_path = false; // for -agentpath vs -agentlib
2810
2811 const JavaVMOption* option = args->options + index;
2812
2813 if (!match_option(option, "-Djava.class.path", &tail) &&
2814 !match_option(option, "-Dsun.java.command", &tail) &&
2815 !match_option(option, "-Dsun.java.launcher", &tail)) {
2816
2817 // add all jvm options to the jvm_args string. This string
2818 // is used later to set the java.vm.args PerfData string constant.
2819 // the -Djava.class.path and the -Dsun.java.command options are
2820 // omitted from jvm_args string as each have their own PerfData
2821 // string constant object.
2822 build_jvm_args(option->optionString);
2823 }
2824
2825 // -verbose:[class/module/gc/jni]
2826 if (match_option(option, "-verbose", &tail)) {
2827 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2828 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2829 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2830 } else if (!strcmp(tail, ":module")) {
2831 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2832 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2833 } else if (!strcmp(tail, ":gc")) {
2834 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2835 } else if (!strcmp(tail, ":jni")) {
2836 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2837 return JNI_EINVAL;
2838 }
2839 }
2840 // -da / -ea / -disableassertions / -enableassertions
2841 // These accept an optional class/package name separated by a colon, e.g.,
2842 // -da:java.lang.Thread.
2843 } else if (match_option(option, user_assertion_options, &tail, true)) {
2844 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2845 if (*tail == '\0') {
2846 JavaAssertions::setUserClassDefault(enable);
2847 } else {
2848 assert(*tail == ':', "bogus match by match_option()");
2849 JavaAssertions::addOption(tail + 1, enable);
2850 }
2851 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2852 } else if (match_option(option, system_assertion_options, &tail, false)) {
2853 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2854 JavaAssertions::setSystemClassDefault(enable);
2855 // -bootclasspath:
2856 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2857 jio_fprintf(defaultStream::output_stream(),
2858 "-Xbootclasspath is no longer a supported option.\n");
2859 return JNI_EINVAL;
2860 // -bootclasspath/a:
2861 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2862 Arguments::append_sysclasspath(tail);
2863 // -bootclasspath/p:
2864 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2865 jio_fprintf(defaultStream::output_stream(),
2866 "-Xbootclasspath/p is no longer a supported option.\n");
2867 return JNI_EINVAL;
2868 // -Xrun
2869 } else if (match_option(option, "-Xrun", &tail)) {
2870 if (tail != NULL) {
2871 const char* pos = strchr(tail, ':');
2872 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2873 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2874 jio_snprintf(name, len + 1, "%s", tail);
2875
2876 char *options = NULL;
2877 if(pos != NULL) {
2878 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2879 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2880 }
2881 #if !INCLUDE_JVMTI
2882 if (strcmp(name, "jdwp") == 0) {
2883 jio_fprintf(defaultStream::error_stream(),
2884 "Debugging agents are not supported in this VM\n");
2885 return JNI_ERR;
2886 }
2887 #endif // !INCLUDE_JVMTI
2888 add_init_library(name, options);
2889 }
2890 } else if (match_option(option, "--add-reads=", &tail)) {
2891 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2892 return JNI_ENOMEM;
2893 }
2894 } else if (match_option(option, "--add-exports=", &tail)) {
2895 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2896 return JNI_ENOMEM;
2897 }
2898 } else if (match_option(option, "--add-opens=", &tail)) {
2899 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2900 return JNI_ENOMEM;
2901 }
2902 } else if (match_option(option, "--add-modules=", &tail)) {
2903 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2904 return JNI_ENOMEM;
2905 }
2906 } else if (match_option(option, "--limit-modules=", &tail)) {
2907 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2908 return JNI_ENOMEM;
2909 }
2910 } else if (match_option(option, "--module-path=", &tail)) {
2911 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2912 return JNI_ENOMEM;
2913 }
2914 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2915 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2916 return JNI_ENOMEM;
2917 }
2918 } else if (match_option(option, "--patch-module=", &tail)) {
2919 // --patch-module=<module>=<file>(<pathsep><file>)*
2920 int res = process_patch_mod_option(tail, patch_mod_javabase);
2921 if (res != JNI_OK) {
2922 return res;
2923 }
2924 } else if (match_option(option, "--illegal-access=", &tail)) {
2925 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2926 return JNI_ENOMEM;
2927 }
2928 // -agentlib and -agentpath
2929 } else if (match_option(option, "-agentlib:", &tail) ||
2930 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2931 if(tail != NULL) {
2932 const char* pos = strchr(tail, '=');
2933 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2934 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2935 name[len] = '\0';
2936
2937 char *options = NULL;
2938 if(pos != NULL) {
2939 options = os::strdup_check_oom(pos + 1, mtArguments);
2940 }
2941 #if !INCLUDE_JVMTI
2942 if (valid_jdwp_agent(name, is_absolute_path)) {
2943 jio_fprintf(defaultStream::error_stream(),
2944 "Debugging agents are not supported in this VM\n");
2945 return JNI_ERR;
2946 }
2947 #endif // !INCLUDE_JVMTI
2948 add_init_agent(name, options, is_absolute_path);
2949 }
2950 // -javaagent
2951 } else if (match_option(option, "-javaagent:", &tail)) {
2952 #if !INCLUDE_JVMTI
2953 jio_fprintf(defaultStream::error_stream(),
2954 "Instrumentation agents are not supported in this VM\n");
2955 return JNI_ERR;
2956 #else
2957 if (tail != NULL) {
2958 size_t length = strlen(tail) + 1;
2959 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2960 jio_snprintf(options, length, "%s", tail);
2961 add_init_agent("instrument", options, false);
2962 // java agents need module java.instrument
2963 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2964 return JNI_ENOMEM;
2965 }
2966 }
2967 #endif // !INCLUDE_JVMTI
2968 // -Xnoclassgc
2969 } else if (match_option(option, "-Xnoclassgc")) {
2970 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2971 return JNI_EINVAL;
2972 }
2973 // -Xconcgc
2974 } else if (match_option(option, "-Xconcgc")) {
2975 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2976 return JNI_EINVAL;
2977 }
2978 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2979 // -Xnoconcgc
2980 } else if (match_option(option, "-Xnoconcgc")) {
2981 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2982 return JNI_EINVAL;
2983 }
2984 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2985 // -Xbatch
2986 } else if (match_option(option, "-Xbatch")) {
2987 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2988 return JNI_EINVAL;
2989 }
2990 // -Xmn for compatibility with other JVM vendors
2991 } else if (match_option(option, "-Xmn", &tail)) {
2992 julong long_initial_young_size = 0;
2993 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2994 if (errcode != arg_in_range) {
2995 jio_fprintf(defaultStream::error_stream(),
2996 "Invalid initial young generation size: %s\n", option->optionString);
2997 describe_range_error(errcode);
2998 return JNI_EINVAL;
2999 }
3000 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 // -Xms
3007 } else if (match_option(option, "-Xms", &tail)) {
3008 julong long_initial_heap_size = 0;
3009 // an initial heap size of 0 means automatically determine
3010 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3011 if (errcode != arg_in_range) {
3012 jio_fprintf(defaultStream::error_stream(),
3013 "Invalid initial heap size: %s\n", option->optionString);
3014 describe_range_error(errcode);
3015 return JNI_EINVAL;
3016 }
3017 set_min_heap_size((size_t)long_initial_heap_size);
3018 // Currently the minimum size and the initial heap sizes are the same.
3019 // Can be overridden with -XX:InitialHeapSize.
3020 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
3021 return JNI_EINVAL;
3022 }
3023 // -Xmx
3024 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3025 julong long_max_heap_size = 0;
3026 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3027 if (errcode != arg_in_range) {
3028 jio_fprintf(defaultStream::error_stream(),
3029 "Invalid maximum heap size: %s\n", option->optionString);
3030 describe_range_error(errcode);
3031 return JNI_EINVAL;
3032 }
3033 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
3034 return JNI_EINVAL;
3035 }
3036 // Xmaxf
3037 } else if (match_option(option, "-Xmaxf", &tail)) {
3038 char* err;
3039 int maxf = (int)(strtod(tail, &err) * 100);
3040 if (*err != '\0' || *tail == '\0') {
3041 jio_fprintf(defaultStream::error_stream(),
3042 "Bad max heap free percentage size: %s\n",
3043 option->optionString);
3044 return JNI_EINVAL;
3045 } else {
3046 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 }
3050 // Xminf
3051 } else if (match_option(option, "-Xminf", &tail)) {
3052 char* err;
3053 int minf = (int)(strtod(tail, &err) * 100);
3054 if (*err != '\0' || *tail == '\0') {
3055 jio_fprintf(defaultStream::error_stream(),
3056 "Bad min heap free percentage size: %s\n",
3057 option->optionString);
3058 return JNI_EINVAL;
3059 } else {
3060 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3061 return JNI_EINVAL;
3062 }
3063 }
3064 // -Xss
3065 } else if (match_option(option, "-Xss", &tail)) {
3066 intx value = 0;
3067 jint err = parse_xss(option, tail, &value);
3068 if (err != JNI_OK) {
3069 return err;
3070 }
3071 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3075 } else if (match_option(option, "-Xoss", &tail) ||
3076 match_option(option, "-Xsqnopause") ||
3077 match_option(option, "-Xoptimize") ||
3078 match_option(option, "-Xboundthreads") ||
3079 match_option(option, "-Xusealtsigs")) {
3080 // All these options are deprecated in JDK 9 and will be removed in a future release
3081 char version[256];
3082 JDK_Version::jdk(9).to_string(version, sizeof(version));
3083 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3084 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3085 julong long_CodeCacheExpansionSize = 0;
3086 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3087 if (errcode != arg_in_range) {
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3090 os::vm_page_size()/K);
3091 return JNI_EINVAL;
3092 }
3093 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3094 return JNI_EINVAL;
3095 }
3096 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3097 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3098 julong long_ReservedCodeCacheSize = 0;
3099
3100 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3101 if (errcode != arg_in_range) {
3102 jio_fprintf(defaultStream::error_stream(),
3103 "Invalid maximum code cache size: %s.\n", option->optionString);
3104 return JNI_EINVAL;
3105 }
3106 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3107 return JNI_EINVAL;
3108 }
3109 // -XX:NonNMethodCodeHeapSize=
3110 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3111 julong long_NonNMethodCodeHeapSize = 0;
3112
3113 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3114 if (errcode != arg_in_range) {
3115 jio_fprintf(defaultStream::error_stream(),
3116 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3117 return JNI_EINVAL;
3118 }
3119 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3120 return JNI_EINVAL;
3121 }
3122 // -XX:ProfiledCodeHeapSize=
3123 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3124 julong long_ProfiledCodeHeapSize = 0;
3125
3126 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3127 if (errcode != arg_in_range) {
3128 jio_fprintf(defaultStream::error_stream(),
3129 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3130 return JNI_EINVAL;
3131 }
3132 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3133 return JNI_EINVAL;
3134 }
3135 // -XX:NonProfiledCodeHeapSizee=
3136 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3137 julong long_NonProfiledCodeHeapSize = 0;
3138
3139 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3140 if (errcode != arg_in_range) {
3141 jio_fprintf(defaultStream::error_stream(),
3142 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3143 return JNI_EINVAL;
3144 }
3145 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3146 return JNI_EINVAL;
3147 }
3148 // -green
3149 } else if (match_option(option, "-green")) {
3150 jio_fprintf(defaultStream::error_stream(),
3151 "Green threads support not available\n");
3152 return JNI_EINVAL;
3153 // -native
3154 } else if (match_option(option, "-native")) {
3155 // HotSpot always uses native threads, ignore silently for compatibility
3156 // -Xrs
3157 } else if (match_option(option, "-Xrs")) {
3158 // Classic/EVM option, new functionality
3159 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 // -Xprof
3163 } else if (match_option(option, "-Xprof")) {
3164 #if INCLUDE_FPROF
3165 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release.");
3166 _has_profile = true;
3167 #else // INCLUDE_FPROF
3168 jio_fprintf(defaultStream::error_stream(),
3169 "Flat profiling is not supported in this VM.\n");
3170 return JNI_ERR;
3171 #endif // INCLUDE_FPROF
3172 // -Xconcurrentio
3173 } else if (match_option(option, "-Xconcurrentio")) {
3174 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3175 return JNI_EINVAL;
3176 }
3177 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3184 return JNI_EINVAL;
3185 }
3186 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3187 return JNI_EINVAL;
3188 }
3189
3190 // -Xinternalversion
3191 } else if (match_option(option, "-Xinternalversion")) {
3192 jio_fprintf(defaultStream::output_stream(), "%s\n",
3193 VM_Version::internal_vm_info_string());
3194 vm_exit(0);
3195 #ifndef PRODUCT
3196 // -Xprintflags
3197 } else if (match_option(option, "-Xprintflags")) {
3198 CommandLineFlags::printFlags(tty, false);
3199 vm_exit(0);
3200 #endif
3201 // -D
3202 } else if (match_option(option, "-D", &tail)) {
3203 const char* value;
3204 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3205 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3206 // abort if -Djava.endorsed.dirs is set
3207 jio_fprintf(defaultStream::output_stream(),
3208 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3209 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3210 return JNI_EINVAL;
3211 }
3212 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3213 *value != '\0' && strcmp(value, "\"\"") != 0) {
3214 // abort if -Djava.ext.dirs is set
3215 jio_fprintf(defaultStream::output_stream(),
3216 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3217 return JNI_EINVAL;
3218 }
3219 // Check for module related properties. They must be set using the modules
3220 // options. For example: use "--add-modules=java.sql", not
3221 // "-Djdk.module.addmods=java.sql"
3222 if (is_internal_module_property(option->optionString + 2)) {
3223 needs_module_property_warning = true;
3224 continue;
3225 }
3226
3227 if (!add_property(tail)) {
3228 return JNI_ENOMEM;
3229 }
3230 // Out of the box management support
3231 if (match_option(option, "-Dcom.sun.management", &tail)) {
3232 #if INCLUDE_MANAGEMENT
3233 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3234 return JNI_EINVAL;
3235 }
3236 // management agent in module jdk.management.agent
3237 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3238 return JNI_ENOMEM;
3239 }
3240 #else
3241 jio_fprintf(defaultStream::output_stream(),
3242 "-Dcom.sun.management is not supported in this VM.\n");
3243 return JNI_ERR;
3244 #endif
3245 }
3246 // -Xint
3247 } else if (match_option(option, "-Xint")) {
3248 set_mode_flags(_int);
3249 // -Xmixed
3250 } else if (match_option(option, "-Xmixed")) {
3251 set_mode_flags(_mixed);
3252 // -Xcomp
3253 } else if (match_option(option, "-Xcomp")) {
3254 // for testing the compiler; turn off all flags that inhibit compilation
3255 set_mode_flags(_comp);
3256 // -Xshare:dump
3257 } else if (match_option(option, "-Xshare:dump")) {
3258 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3259 return JNI_EINVAL;
3260 }
3261 set_mode_flags(_int); // Prevent compilation, which creates objects
3262 // -Xshare:on
3263 } else if (match_option(option, "-Xshare:on")) {
3264 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3265 return JNI_EINVAL;
3266 }
3267 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3268 return JNI_EINVAL;
3269 }
3270 // -Xshare:auto
3271 } else if (match_option(option, "-Xshare:auto")) {
3272 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3273 return JNI_EINVAL;
3274 }
3275 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3276 return JNI_EINVAL;
3277 }
3278 // -Xshare:off
3279 } else if (match_option(option, "-Xshare:off")) {
3280 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3281 return JNI_EINVAL;
3282 }
3283 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3284 return JNI_EINVAL;
3285 }
3286 // -Xverify
3287 } else if (match_option(option, "-Xverify", &tail)) {
3288 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3289 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3293 return JNI_EINVAL;
3294 }
3295 } else if (strcmp(tail, ":remote") == 0) {
3296 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3297 return JNI_EINVAL;
3298 }
3299 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3300 return JNI_EINVAL;
3301 }
3302 } else if (strcmp(tail, ":none") == 0) {
3303 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3304 return JNI_EINVAL;
3305 }
3306 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3307 return JNI_EINVAL;
3308 }
3309 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3310 return JNI_EINVAL;
3311 }
3312 // -Xdebug
3313 } else if (match_option(option, "-Xdebug")) {
3314 // note this flag has been used, then ignore
3315 set_xdebug_mode(true);
3316 // -Xnoagent
3317 } else if (match_option(option, "-Xnoagent")) {
3318 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3319 } else if (match_option(option, "-Xloggc:", &tail)) {
3320 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3321 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3322 _gc_log_filename = os::strdup_check_oom(tail);
3323 } else if (match_option(option, "-Xlog", &tail)) {
3324 bool ret = false;
3325 if (strcmp(tail, ":help") == 0) {
3326 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3327 vm_exit(0);
3328 } else if (strcmp(tail, ":disable") == 0) {
3329 LogConfiguration::disable_logging();
3330 ret = true;
3331 } else if (*tail == '\0') {
3332 ret = LogConfiguration::parse_command_line_arguments();
3333 assert(ret, "-Xlog without arguments should never fail to parse");
3334 } else if (*tail == ':') {
3335 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3336 }
3337 if (ret == false) {
3338 jio_fprintf(defaultStream::error_stream(),
3339 "Invalid -Xlog option '-Xlog%s'\n",
3340 tail);
3341 return JNI_EINVAL;
3342 }
3343 // JNI hooks
3344 } else if (match_option(option, "-Xcheck", &tail)) {
3345 if (!strcmp(tail, ":jni")) {
3346 #if !INCLUDE_JNI_CHECK
3347 warning("JNI CHECKING is not supported in this VM");
3348 #else
3349 CheckJNICalls = true;
3350 #endif // INCLUDE_JNI_CHECK
3351 } else if (is_bad_option(option, args->ignoreUnrecognized,
3352 "check")) {
3353 return JNI_EINVAL;
3354 }
3355 } else if (match_option(option, "vfprintf")) {
3356 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3357 } else if (match_option(option, "exit")) {
3358 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3359 } else if (match_option(option, "abort")) {
3360 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3361 // -XX:+AggressiveHeap
3362 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3363 jint result = set_aggressive_heap_flags();
3364 if (result != JNI_OK) {
3365 return result;
3366 }
3367 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3368 // and the last option wins.
3369 } else if (match_option(option, "-XX:+NeverTenure")) {
3370 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3371 return JNI_EINVAL;
3372 }
3373 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3374 return JNI_EINVAL;
3375 }
3376 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3377 return JNI_EINVAL;
3378 }
3379 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3380 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3381 return JNI_EINVAL;
3382 }
3383 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3384 return JNI_EINVAL;
3385 }
3386 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3387 return JNI_EINVAL;
3388 }
3389 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3390 uintx max_tenuring_thresh = 0;
3391 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3392 jio_fprintf(defaultStream::error_stream(),
3393 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3394 return JNI_EINVAL;
3395 }
3396
3397 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3398 return JNI_EINVAL;
3399 }
3400
3401 if (MaxTenuringThreshold == 0) {
3402 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3403 return JNI_EINVAL;
3404 }
3405 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3406 return JNI_EINVAL;
3407 }
3408 } else {
3409 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3410 return JNI_EINVAL;
3411 }
3412 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3413 return JNI_EINVAL;
3414 }
3415 }
3416 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3417 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3418 return JNI_EINVAL;
3419 }
3420 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3421 return JNI_EINVAL;
3422 }
3423 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3424 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3425 return JNI_EINVAL;
3426 }
3427 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3428 return JNI_EINVAL;
3429 }
3430 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3431 #if defined(DTRACE_ENABLED)
3432 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3433 return JNI_EINVAL;
3434 }
3435 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3436 return JNI_EINVAL;
3437 }
3438 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3439 return JNI_EINVAL;
3440 }
3441 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3442 return JNI_EINVAL;
3443 }
3444 #else // defined(DTRACE_ENABLED)
3445 jio_fprintf(defaultStream::error_stream(),
3446 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3447 return JNI_EINVAL;
3448 #endif // defined(DTRACE_ENABLED)
3449 #ifdef ASSERT
3450 } else if (match_option(option, "-XX:+FullGCALot")) {
3451 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3452 return JNI_EINVAL;
3453 }
3454 // disable scavenge before parallel mark-compact
3455 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3456 return JNI_EINVAL;
3457 }
3458 #endif
3459 #if !INCLUDE_MANAGEMENT
3460 } else if (match_option(option, "-XX:+ManagementServer")) {
3461 jio_fprintf(defaultStream::error_stream(),
3462 "ManagementServer is not supported in this VM.\n");
3463 return JNI_ERR;
3464 #endif // INCLUDE_MANAGEMENT
3465 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3466 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3467 // already been handled
3468 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3469 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3470 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3471 return JNI_EINVAL;
3472 }
3473 }
3474 // Unknown option
3475 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3476 return JNI_ERR;
3477 }
3478 }
3479
3480 // PrintSharedArchiveAndExit will turn on
3481 // -Xshare:on
3482 // -Xlog:class+path=info
3483 if (PrintSharedArchiveAndExit) {
3484 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3485 return JNI_EINVAL;
3486 }
3487 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3488 return JNI_EINVAL;
3489 }
3490 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3491 }
3492
3493 // Change the default value for flags which have different default values
3494 // when working with older JDKs.
3495 #ifdef LINUX
3496 if (JDK_Version::current().compare_major(6) <= 0 &&
3497 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3498 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3499 }
3500 #endif // LINUX
3501 fix_appclasspath();
3502 return JNI_OK;
3503 }
3504
3505 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3506 // For java.base check for duplicate --patch-module options being specified on the command line.
3507 // This check is only required for java.base, all other duplicate module specifications
3508 // will be checked during module system initialization. The module system initialization
3509 // will throw an ExceptionInInitializerError if this situation occurs.
3510 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3511 if (*patch_mod_javabase) {
3512 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3513 } else {
3514 *patch_mod_javabase = true;
3515 }
3516 }
3517
3518 // Create GrowableArray lazily, only if --patch-module has been specified
3519 if (_patch_mod_prefix == NULL) {
3520 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3521 }
3522
3523 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3524 }
3525
3526 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3527 //
3528 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3529 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3530 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3531 // path is treated as the current directory.
3532 //
3533 // This causes problems with CDS, which requires that all directories specified in the classpath
3534 // must be empty. In most cases, applications do NOT want to load classes from the current
3535 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3536 // scripts compatible with CDS.
3537 void Arguments::fix_appclasspath() {
3538 if (IgnoreEmptyClassPaths) {
3539 const char separator = *os::path_separator();
3540 const char* src = _java_class_path->value();
3541
3542 // skip over all the leading empty paths
3543 while (*src == separator) {
3544 src ++;
3545 }
3546
3547 char* copy = os::strdup_check_oom(src, mtArguments);
3548
3549 // trim all trailing empty paths
3550 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3551 *tail = '\0';
3552 }
3553
3554 char from[3] = {separator, separator, '\0'};
3555 char to [2] = {separator, '\0'};
3556 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3557 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3558 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3559 }
3560
3561 _java_class_path->set_writeable_value(copy);
3562 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3563 }
3564 }
3565
3566 static bool has_jar_files(const char* directory) {
3567 DIR* dir = os::opendir(directory);
3568 if (dir == NULL) return false;
3569
3570 struct dirent *entry;
3571 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3572 bool hasJarFile = false;
3573 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3574 const char* name = entry->d_name;
3575 const char* ext = name + strlen(name) - 4;
3576 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3577 }
3578 FREE_C_HEAP_ARRAY(char, dbuf);
3579 os::closedir(dir);
3580 return hasJarFile ;
3581 }
3582
3583 static int check_non_empty_dirs(const char* path) {
3584 const char separator = *os::path_separator();
3585 const char* const end = path + strlen(path);
3586 int nonEmptyDirs = 0;
3587 while (path < end) {
3588 const char* tmp_end = strchr(path, separator);
3589 if (tmp_end == NULL) {
3590 if (has_jar_files(path)) {
3591 nonEmptyDirs++;
3592 jio_fprintf(defaultStream::output_stream(),
3593 "Non-empty directory: %s\n", path);
3594 }
3595 path = end;
3596 } else {
3597 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3598 memcpy(dirpath, path, tmp_end - path);
3599 dirpath[tmp_end - path] = '\0';
3600 if (has_jar_files(dirpath)) {
3601 nonEmptyDirs++;
3602 jio_fprintf(defaultStream::output_stream(),
3603 "Non-empty directory: %s\n", dirpath);
3604 }
3605 FREE_C_HEAP_ARRAY(char, dirpath);
3606 path = tmp_end + 1;
3607 }
3608 }
3609 return nonEmptyDirs;
3610 }
3611
3612 jint Arguments::finalize_vm_init_args() {
3613 // check if the default lib/endorsed directory exists; if so, error
3614 char path[JVM_MAXPATHLEN];
3615 const char* fileSep = os::file_separator();
3616 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3617
3618 if (CheckEndorsedAndExtDirs) {
3619 int nonEmptyDirs = 0;
3620 // check endorsed directory
3621 nonEmptyDirs += check_non_empty_dirs(path);
3622 // check the extension directories
3623 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3624 if (nonEmptyDirs > 0) {
3625 return JNI_ERR;
3626 }
3627 }
3628
3629 DIR* dir = os::opendir(path);
3630 if (dir != NULL) {
3631 jio_fprintf(defaultStream::output_stream(),
3632 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3633 "in modular form will be supported via the concept of upgradeable modules.\n");
3634 os::closedir(dir);
3635 return JNI_ERR;
3636 }
3637
3638 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3639 dir = os::opendir(path);
3640 if (dir != NULL) {
3641 jio_fprintf(defaultStream::output_stream(),
3642 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3643 "Use -classpath instead.\n.");
3644 os::closedir(dir);
3645 return JNI_ERR;
3646 }
3647
3648 // This must be done after all arguments have been processed.
3649 // java_compiler() true means set to "NONE" or empty.
3650 if (java_compiler() && !xdebug_mode()) {
3651 // For backwards compatibility, we switch to interpreted mode if
3652 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3653 // not specified.
3654 set_mode_flags(_int);
3655 }
3656
3657 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3658 // but like -Xint, leave compilation thresholds unaffected.
3659 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3660 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3661 set_mode_flags(_int);
3662 }
3663
3664 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3665 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3666 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3667 }
3668
3669 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3670 // Don't degrade server performance for footprint
3671 if (FLAG_IS_DEFAULT(UseLargePages) &&
3672 MaxHeapSize < LargePageHeapSizeThreshold) {
3673 // No need for large granularity pages w/small heaps.
3674 // Note that large pages are enabled/disabled for both the
3675 // Java heap and the code cache.
3676 FLAG_SET_DEFAULT(UseLargePages, false);
3677 }
3678
3679 #elif defined(COMPILER2)
3680 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3681 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3682 }
3683 #endif
3684
3685 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3686 UNSUPPORTED_OPTION(ProfileInterpreter);
3687 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3688 #endif
3689
3690 #ifndef TIERED
3691 // Tiered compilation is undefined.
3692 UNSUPPORTED_OPTION(TieredCompilation);
3693 #endif
3694
3695 #if INCLUDE_JVMCI
3696 if (EnableJVMCI &&
3697 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3698 return JNI_ENOMEM;
3699 }
3700 #endif
3701
3702 // If we are running in a headless jre, force java.awt.headless property
3703 // to be true unless the property has already been set.
3704 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3705 if (os::is_headless_jre()) {
3706 const char* headless = Arguments::get_property("java.awt.headless");
3707 if (headless == NULL) {
3708 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3709 if (headless_env == NULL) {
3710 if (!add_property("java.awt.headless=true")) {
3711 return JNI_ENOMEM;
3712 }
3713 } else {
3714 char buffer[256];
3715 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3716 if (!add_property(buffer)) {
3717 return JNI_ENOMEM;
3718 }
3719 }
3720 }
3721 }
3722
3723 if (!check_vm_args_consistency()) {
3724 return JNI_ERR;
3725 }
3726
3727 #if INCLUDE_JVMCI
3728 if (UseJVMCICompiler) {
3729 Compilation_mode = CompMode_server;
3730 }
3731 #endif
3732
3733 return JNI_OK;
3734 }
3735
3736 // Helper class for controlling the lifetime of JavaVMInitArgs
3737 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3738 // deleted on the destruction of the ScopedVMInitArgs object.
3739 class ScopedVMInitArgs : public StackObj {
3740 private:
3741 JavaVMInitArgs _args;
3742 char* _container_name;
3743 bool _is_set;
3744 char* _vm_options_file_arg;
3745
3746 public:
3747 ScopedVMInitArgs(const char *container_name) {
3748 _args.version = JNI_VERSION_1_2;
3749 _args.nOptions = 0;
3750 _args.options = NULL;
3751 _args.ignoreUnrecognized = false;
3752 _container_name = (char *)container_name;
3753 _is_set = false;
3754 _vm_options_file_arg = NULL;
3755 }
3756
3757 // Populates the JavaVMInitArgs object represented by this
3758 // ScopedVMInitArgs object with the arguments in options. The
3759 // allocated memory is deleted by the destructor. If this method
3760 // returns anything other than JNI_OK, then this object is in a
3761 // partially constructed state, and should be abandoned.
3762 jint set_args(GrowableArray<JavaVMOption>* options) {
3763 _is_set = true;
3764 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3765 JavaVMOption, options->length(), mtArguments);
3766 if (options_arr == NULL) {
3767 return JNI_ENOMEM;
3768 }
3769 _args.options = options_arr;
3770
3771 for (int i = 0; i < options->length(); i++) {
3772 options_arr[i] = options->at(i);
3773 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3774 if (options_arr[i].optionString == NULL) {
3775 // Rely on the destructor to do cleanup.
3776 _args.nOptions = i;
3777 return JNI_ENOMEM;
3778 }
3779 }
3780
3781 _args.nOptions = options->length();
3782 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3783 return JNI_OK;
3784 }
3785
3786 JavaVMInitArgs* get() { return &_args; }
3787 char* container_name() { return _container_name; }
3788 bool is_set() { return _is_set; }
3789 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3790 char* vm_options_file_arg() { return _vm_options_file_arg; }
3791
3792 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3793 if (_vm_options_file_arg != NULL) {
3794 os::free(_vm_options_file_arg);
3795 }
3796 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3797 }
3798
3799 ~ScopedVMInitArgs() {
3800 if (_vm_options_file_arg != NULL) {
3801 os::free(_vm_options_file_arg);
3802 }
3803 if (_args.options == NULL) return;
3804 for (int i = 0; i < _args.nOptions; i++) {
3805 os::free(_args.options[i].optionString);
3806 }
3807 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3808 }
3809
3810 // Insert options into this option list, to replace option at
3811 // vm_options_file_pos (-XX:VMOptionsFile)
3812 jint insert(const JavaVMInitArgs* args,
3813 const JavaVMInitArgs* args_to_insert,
3814 const int vm_options_file_pos) {
3815 assert(_args.options == NULL, "shouldn't be set yet");
3816 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3817 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3818
3819 int length = args->nOptions + args_to_insert->nOptions - 1;
3820 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3821 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3822 for (int i = 0; i < args->nOptions; i++) {
3823 if (i == vm_options_file_pos) {
3824 // insert the new options starting at the same place as the
3825 // -XX:VMOptionsFile option
3826 for (int j = 0; j < args_to_insert->nOptions; j++) {
3827 options->push(args_to_insert->options[j]);
3828 }
3829 } else {
3830 options->push(args->options[i]);
3831 }
3832 }
3833 // make into options array
3834 jint result = set_args(options);
3835 delete options;
3836 return result;
3837 }
3838 };
3839
3840 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3841 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3842 }
3843
3844 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3845 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3846 }
3847
3848 jint Arguments::parse_options_environment_variable(const char* name,
3849 ScopedVMInitArgs* vm_args) {
3850 char *buffer = ::getenv(name);
3851
3852 // Don't check this environment variable if user has special privileges
3853 // (e.g. unix su command).
3854 if (buffer == NULL || os::have_special_privileges()) {
3855 return JNI_OK;
3856 }
3857
3858 if ((buffer = os::strdup(buffer)) == NULL) {
3859 return JNI_ENOMEM;
3860 }
3861
3862 jio_fprintf(defaultStream::error_stream(),
3863 "Picked up %s: %s\n", name, buffer);
3864
3865 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3866
3867 os::free(buffer);
3868 return retcode;
3869 }
3870
3871 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3872 // read file into buffer
3873 int fd = ::open(file_name, O_RDONLY);
3874 if (fd < 0) {
3875 jio_fprintf(defaultStream::error_stream(),
3876 "Could not open options file '%s'\n",
3877 file_name);
3878 return JNI_ERR;
3879 }
3880
3881 struct stat stbuf;
3882 int retcode = os::stat(file_name, &stbuf);
3883 if (retcode != 0) {
3884 jio_fprintf(defaultStream::error_stream(),
3885 "Could not stat options file '%s'\n",
3886 file_name);
3887 os::close(fd);
3888 return JNI_ERR;
3889 }
3890
3891 if (stbuf.st_size == 0) {
3892 // tell caller there is no option data and that is ok
3893 os::close(fd);
3894 return JNI_OK;
3895 }
3896
3897 // '+ 1' for NULL termination even with max bytes
3898 size_t bytes_alloc = stbuf.st_size + 1;
3899
3900 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3901 if (NULL == buf) {
3902 jio_fprintf(defaultStream::error_stream(),
3903 "Could not allocate read buffer for options file parse\n");
3904 os::close(fd);
3905 return JNI_ENOMEM;
3906 }
3907
3908 memset(buf, 0, bytes_alloc);
3909
3910 // Fill buffer
3911 // Use ::read() instead of os::read because os::read()
3912 // might do a thread state transition
3913 // and it is too early for that here
3914
3915 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3916 os::close(fd);
3917 if (bytes_read < 0) {
3918 FREE_C_HEAP_ARRAY(char, buf);
3919 jio_fprintf(defaultStream::error_stream(),
3920 "Could not read options file '%s'\n", file_name);
3921 return JNI_ERR;
3922 }
3923
3924 if (bytes_read == 0) {
3925 // tell caller there is no option data and that is ok
3926 FREE_C_HEAP_ARRAY(char, buf);
3927 return JNI_OK;
3928 }
3929
3930 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3931
3932 FREE_C_HEAP_ARRAY(char, buf);
3933 return retcode;
3934 }
3935
3936 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3937 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3938
3939 // some pointers to help with parsing
3940 char *buffer_end = buffer + buf_len;
3941 char *opt_hd = buffer;
3942 char *wrt = buffer;
3943 char *rd = buffer;
3944
3945 // parse all options
3946 while (rd < buffer_end) {
3947 // skip leading white space from the input string
3948 while (rd < buffer_end && isspace(*rd)) {
3949 rd++;
3950 }
3951
3952 if (rd >= buffer_end) {
3953 break;
3954 }
3955
3956 // Remember this is where we found the head of the token.
3957 opt_hd = wrt;
3958
3959 // Tokens are strings of non white space characters separated
3960 // by one or more white spaces.
3961 while (rd < buffer_end && !isspace(*rd)) {
3962 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3963 int quote = *rd; // matching quote to look for
3964 rd++; // don't copy open quote
3965 while (rd < buffer_end && *rd != quote) {
3966 // include everything (even spaces)
3967 // up until the close quote
3968 *wrt++ = *rd++; // copy to option string
3969 }
3970
3971 if (rd < buffer_end) {
3972 rd++; // don't copy close quote
3973 } else {
3974 // did not see closing quote
3975 jio_fprintf(defaultStream::error_stream(),
3976 "Unmatched quote in %s\n", name);
3977 delete options;
3978 return JNI_ERR;
3979 }
3980 } else {
3981 *wrt++ = *rd++; // copy to option string
3982 }
3983 }
3984
3985 // steal a white space character and set it to NULL
3986 *wrt++ = '\0';
3987 // We now have a complete token
3988
3989 JavaVMOption option;
3990 option.optionString = opt_hd;
3991 option.extraInfo = NULL;
3992
3993 options->append(option); // Fill in option
3994
3995 rd++; // Advance to next character
3996 }
3997
3998 // Fill out JavaVMInitArgs structure.
3999 jint status = vm_args->set_args(options);
4000
4001 delete options;
4002 return status;
4003 }
4004
4005 void Arguments::set_shared_spaces_flags() {
4006 if (DumpSharedSpaces) {
4007 if (FailOverToOldVerifier) {
4008 // Don't fall back to the old verifier on verification failure. If a
4009 // class fails verification with the split verifier, it might fail the
4010 // CDS runtime verifier constraint check. In that case, we don't want
4011 // to share the class. We only archive classes that pass the split verifier.
4012 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
4013 }
4014
4015 if (RequireSharedSpaces) {
4016 warning("Cannot dump shared archive while using shared archive");
4017 }
4018 UseSharedSpaces = false;
4019 #ifdef _LP64
4020 if (!UseCompressedOops || !UseCompressedClassPointers) {
4021 vm_exit_during_initialization(
4022 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4023 }
4024 } else {
4025 if (!UseCompressedOops || !UseCompressedClassPointers) {
4026 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4027 }
4028 #endif
4029 }
4030 }
4031
4032 // Sharing support
4033 // Construct the path to the archive
4034 static char* get_shared_archive_path() {
4035 char *shared_archive_path;
4036 if (SharedArchiveFile == NULL) {
4037 char jvm_path[JVM_MAXPATHLEN];
4038 os::jvm_path(jvm_path, sizeof(jvm_path));
4039 char *end = strrchr(jvm_path, *os::file_separator());
4040 if (end != NULL) *end = '\0';
4041 size_t jvm_path_len = strlen(jvm_path);
4042 size_t file_sep_len = strlen(os::file_separator());
4043 const size_t len = jvm_path_len + file_sep_len + 20;
4044 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4045 if (shared_archive_path != NULL) {
4046 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4047 jvm_path, os::file_separator());
4048 }
4049 } else {
4050 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4051 }
4052 return shared_archive_path;
4053 }
4054
4055 #ifndef PRODUCT
4056 // Determine whether LogVMOutput should be implicitly turned on.
4057 static bool use_vm_log() {
4058 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4059 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4060 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4061 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4062 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4063 return true;
4064 }
4065
4066 #ifdef COMPILER1
4067 if (PrintC1Statistics) {
4068 return true;
4069 }
4070 #endif // COMPILER1
4071
4072 #ifdef COMPILER2
4073 if (PrintOptoAssembly || PrintOptoStatistics) {
4074 return true;
4075 }
4076 #endif // COMPILER2
4077
4078 return false;
4079 }
4080
4081 #endif // PRODUCT
4082
4083 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4084 for (int index = 0; index < args->nOptions; index++) {
4085 const JavaVMOption* option = args->options + index;
4086 const char* tail;
4087 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4088 return true;
4089 }
4090 }
4091 return false;
4092 }
4093
4094 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4095 const char* vm_options_file,
4096 const int vm_options_file_pos,
4097 ScopedVMInitArgs* vm_options_file_args,
4098 ScopedVMInitArgs* args_out) {
4099 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4100 if (code != JNI_OK) {
4101 return code;
4102 }
4103
4104 if (vm_options_file_args->get()->nOptions < 1) {
4105 return JNI_OK;
4106 }
4107
4108 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4109 jio_fprintf(defaultStream::error_stream(),
4110 "A VM options file may not refer to a VM options file. "
4111 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4112 "options file '%s' in options container '%s' is an error.\n",
4113 vm_options_file_args->vm_options_file_arg(),
4114 vm_options_file_args->container_name());
4115 return JNI_EINVAL;
4116 }
4117
4118 return args_out->insert(args, vm_options_file_args->get(),
4119 vm_options_file_pos);
4120 }
4121
4122 // Expand -XX:VMOptionsFile found in args_in as needed.
4123 // mod_args and args_out parameters may return values as needed.
4124 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4125 ScopedVMInitArgs* mod_args,
4126 JavaVMInitArgs** args_out) {
4127 jint code = match_special_option_and_act(args_in, mod_args);
4128 if (code != JNI_OK) {
4129 return code;
4130 }
4131
4132 if (mod_args->is_set()) {
4133 // args_in contains -XX:VMOptionsFile and mod_args contains the
4134 // original options from args_in along with the options expanded
4135 // from the VMOptionsFile. Return a short-hand to the caller.
4136 *args_out = mod_args->get();
4137 } else {
4138 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4139 }
4140 return JNI_OK;
4141 }
4142
4143 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4144 ScopedVMInitArgs* args_out) {
4145 // Remaining part of option string
4146 const char* tail;
4147 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4148
4149 for (int index = 0; index < args->nOptions; index++) {
4150 const JavaVMOption* option = args->options + index;
4151 if (ArgumentsExt::process_options(option)) {
4152 continue;
4153 }
4154 if (match_option(option, "-XX:Flags=", &tail)) {
4155 Arguments::set_jvm_flags_file(tail);
4156 continue;
4157 }
4158 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4159 if (vm_options_file_args.found_vm_options_file_arg()) {
4160 jio_fprintf(defaultStream::error_stream(),
4161 "The option '%s' is already specified in the options "
4162 "container '%s' so the specification of '%s' in the "
4163 "same options container is an error.\n",
4164 vm_options_file_args.vm_options_file_arg(),
4165 vm_options_file_args.container_name(),
4166 option->optionString);
4167 return JNI_EINVAL;
4168 }
4169 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4170 // If there's a VMOptionsFile, parse that
4171 jint code = insert_vm_options_file(args, tail, index,
4172 &vm_options_file_args, args_out);
4173 if (code != JNI_OK) {
4174 return code;
4175 }
4176 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4177 if (args_out->is_set()) {
4178 // The VMOptions file inserted some options so switch 'args'
4179 // to the new set of options, and continue processing which
4180 // preserves "last option wins" semantics.
4181 args = args_out->get();
4182 // The first option from the VMOptionsFile replaces the
4183 // current option. So we back track to process the
4184 // replacement option.
4185 index--;
4186 }
4187 continue;
4188 }
4189 if (match_option(option, "-XX:+PrintVMOptions")) {
4190 PrintVMOptions = true;
4191 continue;
4192 }
4193 if (match_option(option, "-XX:-PrintVMOptions")) {
4194 PrintVMOptions = false;
4195 continue;
4196 }
4197 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4198 IgnoreUnrecognizedVMOptions = true;
4199 continue;
4200 }
4201 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4202 IgnoreUnrecognizedVMOptions = false;
4203 continue;
4204 }
4205 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4206 CommandLineFlags::printFlags(tty, false);
4207 vm_exit(0);
4208 }
4209 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4210 #if INCLUDE_NMT
4211 // The launcher did not setup nmt environment variable properly.
4212 if (!MemTracker::check_launcher_nmt_support(tail)) {
4213 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4214 }
4215
4216 // Verify if nmt option is valid.
4217 if (MemTracker::verify_nmt_option()) {
4218 // Late initialization, still in single-threaded mode.
4219 if (MemTracker::tracking_level() >= NMT_summary) {
4220 MemTracker::init();
4221 }
4222 } else {
4223 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4224 }
4225 continue;
4226 #else
4227 jio_fprintf(defaultStream::error_stream(),
4228 "Native Memory Tracking is not supported in this VM\n");
4229 return JNI_ERR;
4230 #endif
4231 }
4232
4233 #ifndef PRODUCT
4234 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4235 CommandLineFlags::printFlags(tty, true);
4236 vm_exit(0);
4237 }
4238 #endif
4239 }
4240 return JNI_OK;
4241 }
4242
4243 static void print_options(const JavaVMInitArgs *args) {
4244 const char* tail;
4245 for (int index = 0; index < args->nOptions; index++) {
4246 const JavaVMOption *option = args->options + index;
4247 if (match_option(option, "-XX:", &tail)) {
4248 logOption(tail);
4249 }
4250 }
4251 }
4252
4253 bool Arguments::handle_deprecated_print_gc_flags() {
4254 if (PrintGC) {
4255 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4256 }
4257 if (PrintGCDetails) {
4258 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4259 }
4260
4261 if (_gc_log_filename != NULL) {
4262 // -Xloggc was used to specify a filename
4263 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4264
4265 LogTarget(Error, logging) target;
4266 LogStreamCHeap errstream(target);
4267 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4268 } else if (PrintGC || PrintGCDetails) {
4269 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4270 }
4271 return true;
4272 }
4273
4274 void Arguments::handle_extra_cms_flags(const char* msg) {
4275 SpecialFlag flag;
4276 const char *flag_name = "UseConcMarkSweepGC";
4277 if (lookup_special_flag(flag_name, flag)) {
4278 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4279 warning("%s", msg);
4280 }
4281 }
4282
4283 // Parse entry point called from JNI_CreateJavaVM
4284
4285 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4286 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4287
4288 // Initialize ranges, constraints and writeables
4289 CommandLineFlagRangeList::init();
4290 CommandLineFlagConstraintList::init();
4291 CommandLineFlagWriteableList::init();
4292
4293 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4294 const char* hotspotrc = ".hotspotrc";
4295 bool settings_file_specified = false;
4296 bool needs_hotspotrc_warning = false;
4297 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4298 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4299
4300 // Pointers to current working set of containers
4301 JavaVMInitArgs* cur_cmd_args;
4302 JavaVMInitArgs* cur_java_options_args;
4303 JavaVMInitArgs* cur_java_tool_options_args;
4304
4305 // Containers for modified/expanded options
4306 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4307 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4308 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4309
4310
4311 jint code =
4312 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4313 if (code != JNI_OK) {
4314 return code;
4315 }
4316
4317 code = parse_java_options_environment_variable(&initial_java_options_args);
4318 if (code != JNI_OK) {
4319 return code;
4320 }
4321
4322 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4323 &mod_java_tool_options_args,
4324 &cur_java_tool_options_args);
4325 if (code != JNI_OK) {
4326 return code;
4327 }
4328
4329 code = expand_vm_options_as_needed(initial_cmd_args,
4330 &mod_cmd_args,
4331 &cur_cmd_args);
4332 if (code != JNI_OK) {
4333 return code;
4334 }
4335
4336 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4337 &mod_java_options_args,
4338 &cur_java_options_args);
4339 if (code != JNI_OK) {
4340 return code;
4341 }
4342
4343 const char* flags_file = Arguments::get_jvm_flags_file();
4344 settings_file_specified = (flags_file != NULL);
4345
4346 if (IgnoreUnrecognizedVMOptions) {
4347 cur_cmd_args->ignoreUnrecognized = true;
4348 cur_java_tool_options_args->ignoreUnrecognized = true;
4349 cur_java_options_args->ignoreUnrecognized = true;
4350 }
4351
4352 // Parse specified settings file
4353 if (settings_file_specified) {
4354 if (!process_settings_file(flags_file, true,
4355 cur_cmd_args->ignoreUnrecognized)) {
4356 return JNI_EINVAL;
4357 }
4358 } else {
4359 #ifdef ASSERT
4360 // Parse default .hotspotrc settings file
4361 if (!process_settings_file(".hotspotrc", false,
4362 cur_cmd_args->ignoreUnrecognized)) {
4363 return JNI_EINVAL;
4364 }
4365 #else
4366 struct stat buf;
4367 if (os::stat(hotspotrc, &buf) == 0) {
4368 needs_hotspotrc_warning = true;
4369 }
4370 #endif
4371 }
4372
4373 if (PrintVMOptions) {
4374 print_options(cur_java_tool_options_args);
4375 print_options(cur_cmd_args);
4376 print_options(cur_java_options_args);
4377 }
4378
4379 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4380 jint result = parse_vm_init_args(cur_java_tool_options_args,
4381 cur_java_options_args,
4382 cur_cmd_args);
4383
4384 if (result != JNI_OK) {
4385 return result;
4386 }
4387
4388 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4389 SharedArchivePath = get_shared_archive_path();
4390 if (SharedArchivePath == NULL) {
4391 return JNI_ENOMEM;
4392 }
4393
4394 // Set up VerifySharedSpaces
4395 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4396 VerifySharedSpaces = true;
4397 }
4398
4399 // Delay warning until here so that we've had a chance to process
4400 // the -XX:-PrintWarnings flag
4401 if (needs_hotspotrc_warning) {
4402 warning("%s file is present but has been ignored. "
4403 "Run with -XX:Flags=%s to load the file.",
4404 hotspotrc, hotspotrc);
4405 }
4406
4407 if (needs_module_property_warning) {
4408 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4409 " names that are reserved for internal use.");
4410 }
4411
4412 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4413 UNSUPPORTED_OPTION(UseLargePages);
4414 #endif
4415
4416 ArgumentsExt::report_unsupported_options();
4417
4418 #ifndef PRODUCT
4419 if (TraceBytecodesAt != 0) {
4420 TraceBytecodes = true;
4421 }
4422 if (CountCompiledCalls) {
4423 if (UseCounterDecay) {
4424 warning("UseCounterDecay disabled because CountCalls is set");
4425 UseCounterDecay = false;
4426 }
4427 }
4428 #endif // PRODUCT
4429
4430 if (ScavengeRootsInCode == 0) {
4431 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4432 warning("Forcing ScavengeRootsInCode non-zero");
4433 }
4434 ScavengeRootsInCode = 1;
4435 }
4436
4437 if (!handle_deprecated_print_gc_flags()) {
4438 return JNI_EINVAL;
4439 }
4440
4441 // Set object alignment values.
4442 set_object_alignment();
4443
4444 #if !INCLUDE_CDS
4445 if (DumpSharedSpaces || RequireSharedSpaces) {
4446 jio_fprintf(defaultStream::error_stream(),
4447 "Shared spaces are not supported in this VM\n");
4448 return JNI_ERR;
4449 }
4450 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4451 log_is_enabled(Info, cds)) {
4452 warning("Shared spaces are not supported in this VM");
4453 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4454 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4455 }
4456 no_shared_spaces("CDS Disabled");
4457 #endif // INCLUDE_CDS
4458
4459 return JNI_OK;
4460 }
4461
4462 jint Arguments::apply_ergo() {
4463 // Set flags based on ergonomics.
4464 set_ergonomics_flags();
4465
4466 #if INCLUDE_JVMCI
4467 set_jvmci_specific_flags();
4468 #endif
4469
4470 set_shared_spaces_flags();
4471
4472 // Check the GC selections again.
4473 if (!check_gc_consistency()) {
4474 return JNI_EINVAL;
4475 }
4476
4477 if (TieredCompilation) {
4478 set_tiered_flags();
4479 } else {
4480 int max_compilation_policy_choice = 1;
4481 #ifdef COMPILER2
4482 if (is_server_compilation_mode_vm()) {
4483 max_compilation_policy_choice = 2;
4484 }
4485 #endif
4486 // Check if the policy is valid.
4487 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4488 vm_exit_during_initialization(
4489 "Incompatible compilation policy selected", NULL);
4490 }
4491 // Scale CompileThreshold
4492 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4493 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4494 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4495 }
4496 }
4497
4498 #ifdef COMPILER2
4499 #ifndef PRODUCT
4500 if (PrintIdealGraphLevel > 0) {
4501 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4502 }
4503 #endif
4504 #endif
4505
4506 // Set heap size based on available physical memory
4507 set_heap_size();
4508
4509 ArgumentsExt::set_gc_specific_flags();
4510
4511 // Initialize Metaspace flags and alignments
4512 Metaspace::ergo_initialize();
4513
4514 // Set bytecode rewriting flags
4515 set_bytecode_flags();
4516
4517 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4518 jint code = set_aggressive_opts_flags();
4519 if (code != JNI_OK) {
4520 return code;
4521 }
4522
4523 // Turn off biased locking for locking debug mode flags,
4524 // which are subtly different from each other but neither works with
4525 // biased locking
4526 if (UseHeavyMonitors
4527 #ifdef COMPILER1
4528 || !UseFastLocking
4529 #endif // COMPILER1
4530 #if INCLUDE_JVMCI
4531 || !JVMCIUseFastLocking
4532 #endif
4533 ) {
4534 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4535 // flag set to true on command line; warn the user that they
4536 // can't enable biased locking here
4537 warning("Biased Locking is not supported with locking debug flags"
4538 "; ignoring UseBiasedLocking flag." );
4539 }
4540 UseBiasedLocking = false;
4541 }
4542
4543 #ifdef CC_INTERP
4544 // Clear flags not supported on zero.
4545 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4546 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4547 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4548 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4549 #endif // CC_INTERP
4550
4551 #ifdef COMPILER2
4552 if (!EliminateLocks) {
4553 EliminateNestedLocks = false;
4554 }
4555 if (!Inline) {
4556 IncrementalInline = false;
4557 }
4558 #ifndef PRODUCT
4559 if (!IncrementalInline) {
4560 AlwaysIncrementalInline = false;
4561 }
4562 #endif
4563 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4564 // nothing to use the profiling, turn if off
4565 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4566 }
4567 #endif
4568
4569 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4570 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4571 DebugNonSafepoints = true;
4572 }
4573
4574 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4575 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4576 }
4577
4578 if (UseOnStackReplacement && !UseLoopCounter) {
4579 warning("On-stack-replacement requires loop counters; enabling loop counters");
4580 FLAG_SET_DEFAULT(UseLoopCounter, true);
4581 }
4582
4583 #ifndef PRODUCT
4584 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4585 if (use_vm_log()) {
4586 LogVMOutput = true;
4587 }
4588 }
4589 #endif // PRODUCT
4590
4591 if (PrintCommandLineFlags) {
4592 CommandLineFlags::printSetFlags(tty);
4593 }
4594
4595 // Apply CPU specific policy for the BiasedLocking
4596 if (UseBiasedLocking) {
4597 if (!VM_Version::use_biased_locking() &&
4598 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4599 UseBiasedLocking = false;
4600 }
4601 }
4602 #ifdef COMPILER2
4603 if (!UseBiasedLocking || EmitSync != 0) {
4604 UseOptoBiasInlining = false;
4605 }
4606 #endif
4607
4608 return JNI_OK;
4609 }
4610
4611 jint Arguments::adjust_after_os() {
4612 if (UseNUMA) {
4613 if (UseParallelGC || UseParallelOldGC) {
4614 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4615 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4616 }
4617 }
4618 // UseNUMAInterleaving is set to ON for all collectors and
4619 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4620 // such as the parallel collector for Linux and Solaris will
4621 // interleave old gen and survivor spaces on top of NUMA
4622 // allocation policy for the eden space.
4623 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4624 // all platforms and ParallelGC on Windows will interleave all
4625 // of the heap spaces across NUMA nodes.
4626 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4627 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4628 }
4629 }
4630 return JNI_OK;
4631 }
4632
4633 int Arguments::PropertyList_count(SystemProperty* pl) {
4634 int count = 0;
4635 while(pl != NULL) {
4636 count++;
4637 pl = pl->next();
4638 }
4639 return count;
4640 }
4641
4642 // Return the number of readable properties.
4643 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4644 int count = 0;
4645 while(pl != NULL) {
4646 if (pl->is_readable()) {
4647 count++;
4648 }
4649 pl = pl->next();
4650 }
4651 return count;
4652 }
4653
4654 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4655 assert(key != NULL, "just checking");
4656 SystemProperty* prop;
4657 for (prop = pl; prop != NULL; prop = prop->next()) {
4658 if (strcmp(key, prop->key()) == 0) return prop->value();
4659 }
4660 return NULL;
4661 }
4662
4663 // Return the value of the requested property provided that it is a readable property.
4664 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4665 assert(key != NULL, "just checking");
4666 SystemProperty* prop;
4667 // Return the property value if the keys match and the property is not internal or
4668 // it's the special internal property "jdk.boot.class.path.append".
4669 for (prop = pl; prop != NULL; prop = prop->next()) {
4670 if (strcmp(key, prop->key()) == 0) {
4671 if (!prop->internal()) {
4672 return prop->value();
4673 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4674 return prop->value();
4675 } else {
4676 // Property is internal and not jdk.boot.class.path.append so return NULL.
4677 return NULL;
4678 }
4679 }
4680 }
4681 return NULL;
4682 }
4683
4684 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4685 int count = 0;
4686 const char* ret_val = NULL;
4687
4688 while(pl != NULL) {
4689 if(count >= index) {
4690 ret_val = pl->key();
4691 break;
4692 }
4693 count++;
4694 pl = pl->next();
4695 }
4696
4697 return ret_val;
4698 }
4699
4700 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4701 int count = 0;
4702 char* ret_val = NULL;
4703
4704 while(pl != NULL) {
4705 if(count >= index) {
4706 ret_val = pl->value();
4707 break;
4708 }
4709 count++;
4710 pl = pl->next();
4711 }
4712
4713 return ret_val;
4714 }
4715
4716 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4717 SystemProperty* p = *plist;
4718 if (p == NULL) {
4719 *plist = new_p;
4720 } else {
4721 while (p->next() != NULL) {
4722 p = p->next();
4723 }
4724 p->set_next(new_p);
4725 }
4726 }
4727
4728 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4729 bool writeable, bool internal) {
4730 if (plist == NULL)
4731 return;
4732
4733 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4734 PropertyList_add(plist, new_p);
4735 }
4736
4737 void Arguments::PropertyList_add(SystemProperty *element) {
4738 PropertyList_add(&_system_properties, element);
4739 }
4740
4741 // This add maintains unique property key in the list.
4742 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4743 PropertyAppendable append, PropertyWriteable writeable,
4744 PropertyInternal internal) {
4745 if (plist == NULL)
4746 return;
4747
4748 // If property key exist then update with new value.
4749 SystemProperty* prop;
4750 for (prop = *plist; prop != NULL; prop = prop->next()) {
4751 if (strcmp(k, prop->key()) == 0) {
4752 if (append == AppendProperty) {
4753 prop->append_value(v);
4754 } else {
4755 prop->set_value(v);
4756 }
4757 return;
4758 }
4759 }
4760
4761 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4762 }
4763
4764 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4765 // Returns true if all of the source pointed by src has been copied over to
4766 // the destination buffer pointed by buf. Otherwise, returns false.
4767 // Notes:
4768 // 1. If the length (buflen) of the destination buffer excluding the
4769 // NULL terminator character is not long enough for holding the expanded
4770 // pid characters, it also returns false instead of returning the partially
4771 // expanded one.
4772 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4773 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4774 char* buf, size_t buflen) {
4775 const char* p = src;
4776 char* b = buf;
4777 const char* src_end = &src[srclen];
4778 char* buf_end = &buf[buflen - 1];
4779
4780 while (p < src_end && b < buf_end) {
4781 if (*p == '%') {
4782 switch (*(++p)) {
4783 case '%': // "%%" ==> "%"
4784 *b++ = *p++;
4785 break;
4786 case 'p': { // "%p" ==> current process id
4787 // buf_end points to the character before the last character so
4788 // that we could write '\0' to the end of the buffer.
4789 size_t buf_sz = buf_end - b + 1;
4790 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4791
4792 // if jio_snprintf fails or the buffer is not long enough to hold
4793 // the expanded pid, returns false.
4794 if (ret < 0 || ret >= (int)buf_sz) {
4795 return false;
4796 } else {
4797 b += ret;
4798 assert(*b == '\0', "fail in copy_expand_pid");
4799 if (p == src_end && b == buf_end + 1) {
4800 // reach the end of the buffer.
4801 return true;
4802 }
4803 }
4804 p++;
4805 break;
4806 }
4807 default :
4808 *b++ = '%';
4809 }
4810 } else {
4811 *b++ = *p++;
4812 }
4813 }
4814 *b = '\0';
4815 return (p == src_end); // return false if not all of the source was copied
4816 }