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/defaultStream.hpp"
57 #include "utilities/macros.hpp"
58 #include "utilities/stringUtils.hpp"
59 #if INCLUDE_JVMCI
60 #include "jvmci/jvmciRuntime.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc/cms/compactibleFreeListSpace.hpp"
64 #include "gc/g1/g1CollectedHeap.inline.hpp"
65 #include "gc/parallel/parallelScavengeHeap.hpp"
66 #endif // INCLUDE_ALL_GCS
67
68 // Note: This is a special bug reporting site for the JVM
69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
70 #define DEFAULT_JAVA_LAUNCHER "generic"
71
72 char* Arguments::_jvm_flags_file = NULL;
73 char** Arguments::_jvm_flags_array = NULL;
74 int Arguments::_num_jvm_flags = 0;
75 char** Arguments::_jvm_args_array = NULL;
76 int Arguments::_num_jvm_args = 0;
77 char* Arguments::_java_command = NULL;
78 SystemProperty* Arguments::_system_properties = NULL;
79 const char* Arguments::_gc_log_filename = NULL;
80 bool Arguments::_has_profile = false;
81 size_t Arguments::_conservative_max_heap_alignment = 0;
82 size_t Arguments::_min_heap_size = 0;
83 Arguments::Mode Arguments::_mode = _mixed;
84 bool Arguments::_java_compiler = false;
85 bool Arguments::_xdebug_mode = false;
86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
88 int Arguments::_sun_java_launcher_pid = -1;
89 bool Arguments::_sun_java_launcher_is_altjvm = false;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 char* Arguments::SharedArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114
115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
116 PathString *Arguments::_system_boot_class_path = NULL;
117 bool Arguments::_has_jimage = false;
118
119 char* Arguments::_ext_dirs = NULL;
120
121 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
122 // part of the option string.
123 static bool match_option(const JavaVMOption *option, const char* name,
124 const char** tail) {
125 size_t len = strlen(name);
126 if (strncmp(option->optionString, name, len) == 0) {
127 *tail = option->optionString + len;
128 return true;
129 } else {
130 return false;
131 }
132 }
133
134 // Check if 'option' matches 'name'. No "tail" is allowed.
135 static bool match_option(const JavaVMOption *option, const char* name) {
136 const char* tail = NULL;
137 bool result = match_option(option, name, &tail);
138 if (tail != NULL && *tail == '\0') {
139 return result;
140 } else {
141 return false;
142 }
143 }
144
145 // Return true if any of the strings in null-terminated array 'names' matches.
146 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
147 // the option must match exactly.
148 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
149 bool tail_allowed) {
150 for (/* empty */; *names != NULL; ++names) {
151 if (match_option(option, *names, tail)) {
152 if (**tail == '\0' || tail_allowed && **tail == ':') {
153 return true;
154 }
155 }
156 }
157 return false;
158 }
159
160 static void logOption(const char* opt) {
161 if (PrintVMOptions) {
162 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
163 }
164 }
165
166 bool needs_module_property_warning = false;
167
168 #define MODULE_PROPERTY_PREFIX "jdk.module."
169 #define MODULE_PROPERTY_PREFIX_LEN 11
170 #define ADDEXPORTS "addexports"
171 #define ADDEXPORTS_LEN 10
172 #define ADDREADS "addreads"
173 #define ADDREADS_LEN 8
174 #define ADDOPENS "addopens"
175 #define ADDOPENS_LEN 8
176 #define PATCH "patch"
177 #define PATCH_LEN 5
178 #define ADDMODS "addmods"
179 #define ADDMODS_LEN 7
180 #define LIMITMODS "limitmods"
181 #define LIMITMODS_LEN 9
182 #define PATH "path"
183 #define PATH_LEN 4
184 #define UPGRADE_PATH "upgrade.path"
185 #define UPGRADE_PATH_LEN 12
186
187 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
188 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
189 return ((strncmp(option, property, len) == 0) &&
190 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
191 }
192
193 // Return true if property starts with "jdk.module." and its ensuing chars match
194 // any of the reserved module properties.
195 // property should be passed without the leading "-D".
196 bool Arguments::is_internal_module_property(const char* property) {
197 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
198 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
199 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
200 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
201 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
202 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
203 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
204 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
205 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
206 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
207 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
208 return true;
209 }
210 }
211 return false;
212 }
213
214 // Process java launcher properties.
215 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
216 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
217 // sun.java.launcher.pid is defined.
218 // Must do this before setting up other system properties,
219 // as some of them may depend on launcher type.
220 for (int index = 0; index < args->nOptions; index++) {
221 const JavaVMOption* option = args->options + index;
222 const char* tail;
223
224 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
225 process_java_launcher_argument(tail, option->extraInfo);
226 continue;
227 }
228 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
229 if (strcmp(tail, "true") == 0) {
230 _sun_java_launcher_is_altjvm = true;
231 }
232 continue;
233 }
234 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
235 _sun_java_launcher_pid = atoi(tail);
236 continue;
237 }
238 }
239 }
240
241 // Initialize system properties key and value.
242 void Arguments::init_system_properties() {
243
244 // Set up _system_boot_class_path which is not a property but
245 // relies heavily on argument processing and the jdk.boot.class.path.append
246 // property. It is used to store the underlying system boot class path.
247 _system_boot_class_path = new PathString(NULL);
248
249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
250 "Java Virtual Machine Specification", false));
251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
253 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
254 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
255
256 // Following are JVMTI agent writable properties.
257 // Properties values are set to NULL and they are
258 // os specific they are initialized in os::init_system_properties_values().
259 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
260 _java_library_path = new SystemProperty("java.library.path", NULL, true);
261 _java_home = new SystemProperty("java.home", NULL, true);
262 _java_class_path = new SystemProperty("java.class.path", "", true);
263 // jdk.boot.class.path.append is a non-writeable, internal property.
264 // It can only be set by either:
265 // - -Xbootclasspath/a:
266 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
267 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
268
269 // Add to System Property list.
270 PropertyList_add(&_system_properties, _sun_boot_library_path);
271 PropertyList_add(&_system_properties, _java_library_path);
272 PropertyList_add(&_system_properties, _java_home);
273 PropertyList_add(&_system_properties, _java_class_path);
274 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
275
276 // Set OS specific system properties values
277 os::init_system_properties_values();
278 }
279
280 // Update/Initialize System properties after JDK version number is known
281 void Arguments::init_version_specific_system_properties() {
282 enum { bufsz = 16 };
283 char buffer[bufsz];
284 const char* spec_vendor = "Oracle Corporation";
285 uint32_t spec_version = JDK_Version::current().major_version();
286
287 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
288
289 PropertyList_add(&_system_properties,
290 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
291 PropertyList_add(&_system_properties,
292 new SystemProperty("java.vm.specification.version", buffer, false));
293 PropertyList_add(&_system_properties,
294 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
295 }
296
297 /*
298 * -XX argument processing:
299 *
300 * -XX arguments are defined in several places, such as:
301 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
302 * -XX arguments are parsed in parse_argument().
303 * -XX argument bounds checking is done in check_vm_args_consistency().
304 *
305 * Over time -XX arguments may change. There are mechanisms to handle common cases:
306 *
307 * ALIASED: An option that is simply another name for another option. This is often
308 * part of the process of deprecating a flag, but not all aliases need
309 * to be deprecated.
310 *
311 * Create an alias for an option by adding the old and new option names to the
312 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
313 *
314 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
315 * support may be removed in the future. Both regular and aliased options may be
316 * deprecated.
317 *
318 * Add a deprecation warning for an option (or alias) by adding an entry in the
319 * "special_jvm_flags" table and setting the "deprecated_in" field.
320 * Often an option "deprecated" in one major release will
321 * be made "obsolete" in the next. In this case the entry should also have it's
322 * "obsolete_in" field set.
323 *
324 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
325 * on the command line. A warning is printed to let the user know that option might not
326 * be accepted in the future.
327 *
328 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
329 * table and setting the "obsolete_in" field.
330 *
331 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
332 * to the current JDK version. The system will flatly refuse to admit the existence of
333 * the flag. This allows a flag to die automatically over JDK releases.
334 *
335 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
336 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
337 * - Newly obsolete or expired deprecated options should have their global variable
338 * definitions removed (from globals.hpp, etc) and related implementations removed.
339 *
340 * Recommended approach for removing options:
341 *
342 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
343 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
344 *
345 * To remove internal options (e.g. diagnostic, experimental, develop options), use
346 * a 2-step model adding major release numbers to the obsolete and expire columns.
347 *
348 * To change the name of an option, use the alias table as well as a 2-step
349 * model adding major release numbers to the deprecate and expire columns.
350 * Think twice about aliasing commonly used customer options.
351 *
352 * There are times when it is appropriate to leave a future release number as undefined.
353 *
354 * Tests: Aliases should be tested in VMAliasOptions.java.
355 * Deprecated options should be tested in VMDeprecatedOptions.java.
356 */
357
358 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
359 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
360 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
361 // the command-line as usual, but will issue a warning.
362 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
363 // the command-line, while issuing a warning and ignoring the flag value.
364 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
365 // existence of the flag.
366 //
367 // MANUAL CLEANUP ON JDK VERSION UPDATES:
368 // This table ensures that the handling of options will update automatically when the JDK
369 // version is incremented, but the source code needs to be cleanup up manually:
370 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
371 // variable should be removed, as well as users of the variable.
372 // - As "deprecated" options age into "obsolete" options, move the entry into the
373 // "Obsolete Flags" section of the table.
374 // - All expired options should be removed from the table.
375 static SpecialFlag const special_jvm_flags[] = {
376 // -------------- Deprecated Flags --------------
377 // --- Non-alias flags - sorted by obsolete_in then expired_in:
378 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
379 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
380
381 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
382 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
383 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
384
385 // -------------- Obsolete Flags - sorted by expired_in --------------
386 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
387 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
388 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
389 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
390 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
391
392 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
393 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
394 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
395 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
396 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
397 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
398 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
399 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
400 #endif
401
402 { NULL, JDK_Version(0), JDK_Version(0) }
403 };
404
405 // Flags that are aliases for other flags.
406 typedef struct {
407 const char* alias_name;
408 const char* real_name;
409 } AliasedFlag;
410
411 static AliasedFlag const aliased_jvm_flags[] = {
412 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
413 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
414 { NULL, NULL}
415 };
416
417 // NOTE: A compatibility request will be necessary for each alias to be removed.
418 static AliasedLoggingFlag const aliased_logging_flags[] = {
419 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
420 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
421 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
422 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
423 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
424 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
425 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
426 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
427 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
428 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
429 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
430 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
431 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
432 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
433 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
434 };
435
436 #ifndef PRODUCT
437 // These options are removed in jdk9. Remove this code for jdk10.
438 static AliasedFlag const removed_develop_logging_flags[] = {
439 { "TraceClassInitialization", "-Xlog:class+init" },
440 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
441 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
442 { "TraceItables", "-Xlog:itables=debug" },
443 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
444 { "TraceSafepoint", "-Xlog:safepoint=debug" },
445 { "TraceStartupTime", "-Xlog:startuptime" },
446 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
447 { "PrintVtables", "-Xlog:vtables=debug" },
448 { "VerboseVerification", "-Xlog:verification" },
449 { NULL, NULL }
450 };
451 #endif //PRODUCT
452
453 // Return true if "v" is less than "other", where "other" may be "undefined".
454 static bool version_less_than(JDK_Version v, JDK_Version other) {
455 assert(!v.is_undefined(), "must be defined");
456 if (!other.is_undefined() && v.compare(other) >= 0) {
457 return false;
458 } else {
459 return true;
460 }
461 }
462
463 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
464
465 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
466 // Allow extensions to have priority
467 if (lookup_special_flag_ext(flag_name, flag)) {
468 return true;
469 }
470
471 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
472 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
473 flag = special_jvm_flags[i];
474 return true;
475 }
476 }
477 return false;
478 }
479
480 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
481 assert(version != NULL, "Must provide a version buffer");
482 SpecialFlag flag;
483 if (lookup_special_flag(flag_name, flag)) {
484 if (!flag.obsolete_in.is_undefined()) {
485 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
486 *version = flag.obsolete_in;
487 return true;
488 }
489 }
490 }
491 return false;
492 }
493
494 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
495 assert(version != NULL, "Must provide a version buffer");
496 SpecialFlag flag;
497 if (lookup_special_flag(flag_name, flag)) {
498 if (!flag.deprecated_in.is_undefined()) {
499 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
500 version_less_than(JDK_Version::current(), flag.expired_in)) {
501 *version = flag.deprecated_in;
502 return 1;
503 } else {
504 return -1;
505 }
506 }
507 }
508 return 0;
509 }
510
511 #ifndef PRODUCT
512 const char* Arguments::removed_develop_logging_flag_name(const char* name){
513 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
514 const AliasedFlag& flag = removed_develop_logging_flags[i];
515 if (strcmp(flag.alias_name, name) == 0) {
516 return flag.real_name;
517 }
518 }
519 return NULL;
520 }
521 #endif // PRODUCT
522
523 const char* Arguments::real_flag_name(const char *flag_name) {
524 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
525 const AliasedFlag& flag_status = aliased_jvm_flags[i];
526 if (strcmp(flag_status.alias_name, flag_name) == 0) {
527 return flag_status.real_name;
528 }
529 }
530 return flag_name;
531 }
532
533 #ifdef ASSERT
534 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
535 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
536 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
537 return true;
538 }
539 }
540 return false;
541 }
542
543 static bool verify_special_jvm_flags() {
544 bool success = true;
545 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
546 const SpecialFlag& flag = special_jvm_flags[i];
547 if (lookup_special_flag(flag.name, i)) {
548 warning("Duplicate special flag declaration \"%s\"", flag.name);
549 success = false;
550 }
551 if (flag.deprecated_in.is_undefined() &&
552 flag.obsolete_in.is_undefined()) {
553 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
554 success = false;
555 }
556
557 if (!flag.deprecated_in.is_undefined()) {
558 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
559 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
560 success = false;
561 }
562
563 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
564 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
565 success = false;
566 }
567 }
568
569 if (!flag.obsolete_in.is_undefined()) {
570 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
571 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
572 success = false;
573 }
574
575 // if flag has become obsolete it should not have a "globals" flag defined anymore.
576 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
577 if (Flag::find_flag(flag.name) != NULL) {
578 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
579 success = false;
580 }
581 }
582 }
583
584 if (!flag.expired_in.is_undefined()) {
585 // if flag has become expired it should not have a "globals" flag defined anymore.
586 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
587 if (Flag::find_flag(flag.name) != NULL) {
588 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
589 success = false;
590 }
591 }
592 }
593
594 }
595 return success;
596 }
597 #endif
598
599 // Parses a size specification string.
600 bool Arguments::atojulong(const char *s, julong* result) {
601 julong n = 0;
602
603 // First char must be a digit. Don't allow negative numbers or leading spaces.
604 if (!isdigit(*s)) {
605 return false;
606 }
607
608 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
609 char* remainder;
610 errno = 0;
611 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
612 if (errno != 0) {
613 return false;
614 }
615
616 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
617 if (remainder == s || strlen(remainder) > 1) {
618 return false;
619 }
620
621 switch (*remainder) {
622 case 'T': case 't':
623 *result = n * G * K;
624 // Check for overflow.
625 if (*result/((julong)G * K) != n) return false;
626 return true;
627 case 'G': case 'g':
628 *result = n * G;
629 if (*result/G != n) return false;
630 return true;
631 case 'M': case 'm':
632 *result = n * M;
633 if (*result/M != n) return false;
634 return true;
635 case 'K': case 'k':
636 *result = n * K;
637 if (*result/K != n) return false;
638 return true;
639 case '\0':
640 *result = n;
641 return true;
642 default:
643 return false;
644 }
645 }
646
647 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
648 if (size < min_size) return arg_too_small;
649 if (size > max_size) return arg_too_big;
650 return arg_in_range;
651 }
652
653 // Describe an argument out of range error
654 void Arguments::describe_range_error(ArgsRange errcode) {
655 switch(errcode) {
656 case arg_too_big:
657 jio_fprintf(defaultStream::error_stream(),
658 "The specified size exceeds the maximum "
659 "representable size.\n");
660 break;
661 case arg_too_small:
662 case arg_unreadable:
663 case arg_in_range:
664 // do nothing for now
665 break;
666 default:
667 ShouldNotReachHere();
668 }
669 }
670
671 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
672 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
673 return true;
674 } else {
675 return false;
676 }
677 }
678
679 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
680 char* end;
681 errno = 0;
682 double v = strtod(value, &end);
683 if ((errno != 0) || (*end != 0)) {
684 return false;
685 }
686
687 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
688 return true;
689 }
690 return false;
691 }
692
693 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
694 julong v;
695 int int_v;
696 intx intx_v;
697 bool is_neg = false;
698 Flag* result = Flag::find_flag(name, strlen(name));
699
700 if (result == NULL) {
701 return false;
702 }
703
704 // Check the sign first since atojulong() parses only unsigned values.
705 if (*value == '-') {
706 if (!result->is_intx() && !result->is_int()) {
707 return false;
708 }
709 value++;
710 is_neg = true;
711 }
712 if (!Arguments::atojulong(value, &v)) {
713 return false;
714 }
715 if (result->is_int()) {
716 int_v = (int) v;
717 if (is_neg) {
718 int_v = -int_v;
719 }
720 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
721 } else if (result->is_uint()) {
722 uint uint_v = (uint) v;
723 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
724 } else if (result->is_intx()) {
725 intx_v = (intx) v;
726 if (is_neg) {
727 intx_v = -intx_v;
728 }
729 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
730 } else if (result->is_uintx()) {
731 uintx uintx_v = (uintx) v;
732 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
733 } else if (result->is_uint64_t()) {
734 uint64_t uint64_t_v = (uint64_t) v;
735 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
736 } else if (result->is_size_t()) {
737 size_t size_t_v = (size_t) v;
738 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
739 } else if (result->is_double()) {
740 double double_v = (double) v;
741 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
742 } else {
743 return false;
744 }
745 }
746
747 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
748 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
749 // Contract: CommandLineFlags always returns a pointer that needs freeing.
750 FREE_C_HEAP_ARRAY(char, value);
751 return true;
752 }
753
754 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
755 const char* old_value = "";
756 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
757 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
758 size_t new_len = strlen(new_value);
759 const char* value;
760 char* free_this_too = NULL;
761 if (old_len == 0) {
762 value = new_value;
763 } else if (new_len == 0) {
764 value = old_value;
765 } else {
766 size_t length = old_len + 1 + new_len + 1;
767 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
768 // each new setting adds another LINE to the switch:
769 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
770 value = buf;
771 free_this_too = buf;
772 }
773 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
774 // CommandLineFlags always returns a pointer that needs freeing.
775 FREE_C_HEAP_ARRAY(char, value);
776 if (free_this_too != NULL) {
777 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
778 FREE_C_HEAP_ARRAY(char, free_this_too);
779 }
780 return true;
781 }
782
783 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
784 const char* real_name = real_flag_name(arg);
785 JDK_Version since = JDK_Version();
786 switch (is_deprecated_flag(arg, &since)) {
787 case -1:
788 return NULL; // obsolete or expired, don't process normally
789 case 0:
790 return real_name;
791 case 1: {
792 if (warn) {
793 char version[256];
794 since.to_string(version, sizeof(version));
795 if (real_name != arg) {
796 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
797 arg, version, real_name);
798 } else {
799 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
800 arg, version);
801 }
802 }
803 return real_name;
804 }
805 }
806 ShouldNotReachHere();
807 return NULL;
808 }
809
810 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
811 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
812 // Set tagset string buffer at max size of 256, large enough for any alias tagset
813 const int max_tagset_size = 256;
814 int max_tagset_len = max_tagset_size - 1;
815 char tagset_buffer[max_tagset_size];
816 tagset_buffer[0] = '\0';
817
818 // Write tag-set for aliased logging option, in string list form
819 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
820 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
821 if (i > 0) {
822 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
823 }
824 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
825 }
826 if (!alf.exactMatch) {
827 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
828 }
829 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
830 (on) ? "+" : "-",
831 name,
832 tagset_buffer,
833 (on) ? LogLevel::name(alf.level) : "off");
834 }
835
836 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
837 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
838 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
839 if (strcmp(alf.alias_name, name) == 0) {
840 log_deprecated_flag(name, on, alf);
841 return alf;
842 }
843 }
844 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
845 return a;
846 }
847
848 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
849
850 // range of acceptable characters spelled out for portability reasons
851 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
852 #define BUFLEN 255
853 char name[BUFLEN+1];
854 char dummy;
855 const char* real_name;
856 bool warn_if_deprecated = true;
857
858 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
859 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
860 if (alf.alias_name != NULL){
861 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
862 return true;
863 }
864 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
865 if (real_name == NULL) {
866 return false;
867 }
868 return set_bool_flag(real_name, false, origin);
869 }
870 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
871 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
872 if (alf.alias_name != NULL){
873 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
874 return true;
875 }
876 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
877 if (real_name == NULL) {
878 return false;
879 }
880 return set_bool_flag(real_name, true, origin);
881 }
882
883 char punct;
884 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
885 const char* value = strchr(arg, '=') + 1;
886 Flag* flag;
887
888 // this scanf pattern matches both strings (handled here) and numbers (handled later))
889 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
890 if (alf.alias_name != NULL) {
891 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
892 return true;
893 }
894 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
895 if (real_name == NULL) {
896 return false;
897 }
898 flag = Flag::find_flag(real_name);
899 if (flag != NULL && flag->is_ccstr()) {
900 if (flag->ccstr_accumulates()) {
901 return append_to_string_flag(real_name, value, origin);
902 } else {
903 if (value[0] == '\0') {
904 value = NULL;
905 }
906 return set_string_flag(real_name, value, origin);
907 }
908 } else {
909 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
910 }
911 }
912
913 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
914 const char* value = strchr(arg, '=') + 1;
915 // -XX:Foo:=xxx will reset the string flag to the given value.
916 if (value[0] == '\0') {
917 value = NULL;
918 }
919 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
920 if (real_name == NULL) {
921 return false;
922 }
923 return set_string_flag(real_name, value, origin);
924 }
925
926 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
927 #define SIGNED_NUMBER_RANGE "[-0123456789]"
928 #define NUMBER_RANGE "[0123456789eE+-]"
929 char value[BUFLEN + 1];
930 char value2[BUFLEN + 1];
931 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
932 // Looks like a floating-point number -- try again with more lenient format string
933 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
934 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
935 if (real_name == NULL) {
936 return false;
937 }
938 return set_fp_numeric_flag(real_name, value, origin);
939 }
940 }
941
942 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
943 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
944 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
945 if (real_name == NULL) {
946 return false;
947 }
948 return set_numeric_flag(real_name, value, origin);
949 }
950
951 return false;
952 }
953
954 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
955 assert(bldarray != NULL, "illegal argument");
956
957 if (arg == NULL) {
958 return;
959 }
960
961 int new_count = *count + 1;
962
963 // expand the array and add arg to the last element
964 if (*bldarray == NULL) {
965 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
966 } else {
967 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
968 }
969 (*bldarray)[*count] = os::strdup_check_oom(arg);
970 *count = new_count;
971 }
972
973 void Arguments::build_jvm_args(const char* arg) {
974 add_string(&_jvm_args_array, &_num_jvm_args, arg);
975 }
976
977 void Arguments::build_jvm_flags(const char* arg) {
978 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
979 }
980
981 // utility function to return a string that concatenates all
982 // strings in a given char** array
983 const char* Arguments::build_resource_string(char** args, int count) {
984 if (args == NULL || count == 0) {
985 return NULL;
986 }
987 size_t length = 0;
988 for (int i = 0; i < count; i++) {
989 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
990 }
991 char* s = NEW_RESOURCE_ARRAY(char, length);
992 char* dst = s;
993 for (int j = 0; j < count; j++) {
994 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
995 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
996 dst += offset;
997 length -= offset;
998 }
999 return (const char*) s;
1000 }
1001
1002 void Arguments::print_on(outputStream* st) {
1003 st->print_cr("VM Arguments:");
1004 if (num_jvm_flags() > 0) {
1005 st->print("jvm_flags: "); print_jvm_flags_on(st);
1006 st->cr();
1007 }
1008 if (num_jvm_args() > 0) {
1009 st->print("jvm_args: "); print_jvm_args_on(st);
1010 st->cr();
1011 }
1012 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1013 if (_java_class_path != NULL) {
1014 char* path = _java_class_path->value();
1015 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1016 }
1017 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1018 }
1019
1020 void Arguments::print_summary_on(outputStream* st) {
1021 // Print the command line. Environment variables that are helpful for
1022 // reproducing the problem are written later in the hs_err file.
1023 // flags are from setting file
1024 if (num_jvm_flags() > 0) {
1025 st->print_raw("Settings File: ");
1026 print_jvm_flags_on(st);
1027 st->cr();
1028 }
1029 // args are the command line and environment variable arguments.
1030 st->print_raw("Command Line: ");
1031 if (num_jvm_args() > 0) {
1032 print_jvm_args_on(st);
1033 }
1034 // this is the classfile and any arguments to the java program
1035 if (java_command() != NULL) {
1036 st->print("%s", java_command());
1037 }
1038 st->cr();
1039 }
1040
1041 void Arguments::print_jvm_flags_on(outputStream* st) {
1042 if (_num_jvm_flags > 0) {
1043 for (int i=0; i < _num_jvm_flags; i++) {
1044 st->print("%s ", _jvm_flags_array[i]);
1045 }
1046 }
1047 }
1048
1049 void Arguments::print_jvm_args_on(outputStream* st) {
1050 if (_num_jvm_args > 0) {
1051 for (int i=0; i < _num_jvm_args; i++) {
1052 st->print("%s ", _jvm_args_array[i]);
1053 }
1054 }
1055 }
1056
1057 bool Arguments::process_argument(const char* arg,
1058 jboolean ignore_unrecognized,
1059 Flag::Flags origin) {
1060 JDK_Version since = JDK_Version();
1061
1062 if (parse_argument(arg, origin)) {
1063 return true;
1064 }
1065
1066 // Determine if the flag has '+', '-', or '=' characters.
1067 bool has_plus_minus = (*arg == '+' || *arg == '-');
1068 const char* const argname = has_plus_minus ? arg + 1 : arg;
1069
1070 size_t arg_len;
1071 const char* equal_sign = strchr(argname, '=');
1072 if (equal_sign == NULL) {
1073 arg_len = strlen(argname);
1074 } else {
1075 arg_len = equal_sign - argname;
1076 }
1077
1078 // Only make the obsolete check for valid arguments.
1079 if (arg_len <= BUFLEN) {
1080 // Construct a string which consists only of the argument name without '+', '-', or '='.
1081 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1082 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1083 if (is_obsolete_flag(stripped_argname, &since)) {
1084 char version[256];
1085 since.to_string(version, sizeof(version));
1086 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1087 return true;
1088 }
1089 #ifndef PRODUCT
1090 else {
1091 const char* replacement;
1092 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1093 log_warning(arguments)("%s has been removed. Please use %s instead.",
1094 stripped_argname,
1095 replacement);
1096 return false;
1097 }
1098 }
1099 #endif //PRODUCT
1100 }
1101
1102 // For locked flags, report a custom error message if available.
1103 // Otherwise, report the standard unrecognized VM option.
1104 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1105 if (found_flag != NULL) {
1106 char locked_message_buf[BUFLEN];
1107 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1108 if (strlen(locked_message_buf) == 0) {
1109 if (found_flag->is_bool() && !has_plus_minus) {
1110 jio_fprintf(defaultStream::error_stream(),
1111 "Missing +/- setting for VM option '%s'\n", argname);
1112 } else if (!found_flag->is_bool() && has_plus_minus) {
1113 jio_fprintf(defaultStream::error_stream(),
1114 "Unexpected +/- setting in VM option '%s'\n", argname);
1115 } else {
1116 jio_fprintf(defaultStream::error_stream(),
1117 "Improperly specified VM option '%s'\n", argname);
1118 }
1119 } else {
1120 #ifdef PRODUCT
1121 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1122 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1123 if (ignore_unrecognized && mismatched) {
1124 return true;
1125 }
1126 #endif
1127 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1128 }
1129 } else {
1130 if (ignore_unrecognized) {
1131 return true;
1132 }
1133 jio_fprintf(defaultStream::error_stream(),
1134 "Unrecognized VM option '%s'\n", argname);
1135 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1136 if (fuzzy_matched != NULL) {
1137 jio_fprintf(defaultStream::error_stream(),
1138 "Did you mean '%s%s%s'? ",
1139 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1140 fuzzy_matched->_name,
1141 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1142 }
1143 }
1144
1145 // allow for commandline "commenting out" options like -XX:#+Verbose
1146 return arg[0] == '#';
1147 }
1148
1149 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1150 FILE* stream = fopen(file_name, "rb");
1151 if (stream == NULL) {
1152 if (should_exist) {
1153 jio_fprintf(defaultStream::error_stream(),
1154 "Could not open settings file %s\n", file_name);
1155 return false;
1156 } else {
1157 return true;
1158 }
1159 }
1160
1161 char token[1024];
1162 int pos = 0;
1163
1164 bool in_white_space = true;
1165 bool in_comment = false;
1166 bool in_quote = false;
1167 char quote_c = 0;
1168 bool result = true;
1169
1170 int c = getc(stream);
1171 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1172 if (in_white_space) {
1173 if (in_comment) {
1174 if (c == '\n') in_comment = false;
1175 } else {
1176 if (c == '#') in_comment = true;
1177 else if (!isspace(c)) {
1178 in_white_space = false;
1179 token[pos++] = c;
1180 }
1181 }
1182 } else {
1183 if (c == '\n' || (!in_quote && isspace(c))) {
1184 // token ends at newline, or at unquoted whitespace
1185 // this allows a way to include spaces in string-valued options
1186 token[pos] = '\0';
1187 logOption(token);
1188 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1189 build_jvm_flags(token);
1190 pos = 0;
1191 in_white_space = true;
1192 in_quote = false;
1193 } else if (!in_quote && (c == '\'' || c == '"')) {
1194 in_quote = true;
1195 quote_c = c;
1196 } else if (in_quote && (c == quote_c)) {
1197 in_quote = false;
1198 } else {
1199 token[pos++] = c;
1200 }
1201 }
1202 c = getc(stream);
1203 }
1204 if (pos > 0) {
1205 token[pos] = '\0';
1206 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1207 build_jvm_flags(token);
1208 }
1209 fclose(stream);
1210 return result;
1211 }
1212
1213 //=============================================================================================================
1214 // Parsing of properties (-D)
1215
1216 const char* Arguments::get_property(const char* key) {
1217 return PropertyList_get_value(system_properties(), key);
1218 }
1219
1220 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1221 const char* eq = strchr(prop, '=');
1222 const char* key;
1223 const char* value = "";
1224
1225 if (eq == NULL) {
1226 // property doesn't have a value, thus use passed string
1227 key = prop;
1228 } else {
1229 // property have a value, thus extract it and save to the
1230 // allocated string
1231 size_t key_len = eq - prop;
1232 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1233
1234 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1235 key = tmp_key;
1236
1237 value = &prop[key_len + 1];
1238 }
1239
1240 if (strcmp(key, "java.compiler") == 0) {
1241 process_java_compiler_argument(value);
1242 // Record value in Arguments, but let it get passed to Java.
1243 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1244 strcmp(key, "sun.java.launcher.pid") == 0) {
1245 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1246 // private and are processed in process_sun_java_launcher_properties();
1247 // the sun.java.launcher property is passed on to the java application
1248 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1249 // append is true, writable is true, internal is false
1250 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1251 WriteableProperty, ExternalProperty);
1252 } else {
1253 if (strcmp(key, "sun.java.command") == 0) {
1254 char *old_java_command = _java_command;
1255 _java_command = os::strdup_check_oom(value, mtArguments);
1256 if (old_java_command != NULL) {
1257 os::free(old_java_command);
1258 }
1259 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1260 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1261 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1262 // its value without going through the property list or making a Java call.
1263 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1264 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1265 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1266 os::free((void *)old_java_vendor_url_bug);
1267 }
1268 }
1269
1270 // Create new property and add at the end of the list
1271 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1272 }
1273
1274 if (key != prop) {
1275 // SystemProperty copy passed value, thus free previously allocated
1276 // memory
1277 FreeHeap((void *)key);
1278 }
1279
1280 return true;
1281 }
1282
1283 #if INCLUDE_CDS
1284 void Arguments::check_unsupported_dumping_properties() {
1285 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1286 const char* unsupported_properties[] = { "jdk.module.main",
1287 "jdk.module.limitmods",
1288 "jdk.module.path",
1289 "jdk.module.upgrade.path",
1290 "jdk.module.addmods.0",
1291 "jdk.module.patch.0" };
1292 const char* unsupported_options[] = { "-m", // cannot use at dump time
1293 "--limit-modules", // ignored at dump time
1294 "--module-path", // ignored at dump time
1295 "--upgrade-module-path", // ignored at dump time
1296 "--add-modules", // ignored at dump time
1297 "--patch-module" // ignored at dump time
1298 };
1299 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1300 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1301 // vm will exit with an error message. Otherwise, it will print an informational message if
1302 // -Xlog:cds is enabled.
1303 uint info_idx = 1;
1304 SystemProperty* sp = system_properties();
1305 while (sp != NULL) {
1306 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1307 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1308 if (i < info_idx) {
1309 vm_exit_during_initialization(
1310 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1311 } else {
1312 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1313 unsupported_options[i]);
1314 }
1315 }
1316 }
1317 sp = sp->next();
1318 }
1319
1320 // Check for an exploded module build in use with -Xshare:dump.
1321 if (!has_jimage()) {
1322 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1323 }
1324 }
1325 #endif
1326
1327 //===========================================================================================================
1328 // Setting int/mixed/comp mode flags
1329
1330 void Arguments::set_mode_flags(Mode mode) {
1331 // Set up default values for all flags.
1332 // If you add a flag to any of the branches below,
1333 // add a default value for it here.
1334 set_java_compiler(false);
1335 _mode = mode;
1336
1337 // Ensure Agent_OnLoad has the correct initial values.
1338 // This may not be the final mode; mode may change later in onload phase.
1339 PropertyList_unique_add(&_system_properties, "java.vm.info",
1340 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1341
1342 UseInterpreter = true;
1343 UseCompiler = true;
1344 UseLoopCounter = true;
1345
1346 // Default values may be platform/compiler dependent -
1347 // use the saved values
1348 ClipInlining = Arguments::_ClipInlining;
1349 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1350 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1351 BackgroundCompilation = Arguments::_BackgroundCompilation;
1352 if (TieredCompilation) {
1353 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1354 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1355 }
1356 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1357 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1358 }
1359 }
1360
1361 // Change from defaults based on mode
1362 switch (mode) {
1363 default:
1364 ShouldNotReachHere();
1365 break;
1366 case _int:
1367 UseCompiler = false;
1368 UseLoopCounter = false;
1369 AlwaysCompileLoopMethods = false;
1370 UseOnStackReplacement = false;
1371 break;
1372 case _mixed:
1373 // same as default
1374 break;
1375 case _comp:
1376 UseInterpreter = false;
1377 BackgroundCompilation = false;
1378 ClipInlining = false;
1379 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1380 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1381 // compile a level 4 (C2) and then continue executing it.
1382 if (TieredCompilation) {
1383 Tier3InvokeNotifyFreqLog = 0;
1384 Tier4InvocationThreshold = 0;
1385 }
1386 break;
1387 }
1388 }
1389
1390 // Conflict: required to use shared spaces (-Xshare:on), but
1391 // incompatible command line options were chosen.
1392 static void no_shared_spaces(const char* message) {
1393 if (RequireSharedSpaces) {
1394 jio_fprintf(defaultStream::error_stream(),
1395 "Class data sharing is inconsistent with other specified options.\n");
1396 vm_exit_during_initialization("Unable to use shared archive.", message);
1397 } else {
1398 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1399 }
1400 }
1401
1402 // Returns threshold scaled with the value of scale.
1403 // If scale < 0.0, threshold is returned without scaling.
1404 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1405 if (scale == 1.0 || scale < 0.0) {
1406 return threshold;
1407 } else {
1408 return (intx)(threshold * scale);
1409 }
1410 }
1411
1412 // Returns freq_log scaled with the value of scale.
1413 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1414 // If scale < 0.0, freq_log is returned without scaling.
1415 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1416 // Check if scaling is necessary or if negative value was specified.
1417 if (scale == 1.0 || scale < 0.0) {
1418 return freq_log;
1419 }
1420 // Check values to avoid calculating log2 of 0.
1421 if (scale == 0.0 || freq_log == 0) {
1422 return 0;
1423 }
1424 // Determine the maximum notification frequency value currently supported.
1425 // The largest mask value that the interpreter/C1 can handle is
1426 // of length InvocationCounter::number_of_count_bits. Mask values are always
1427 // one bit shorter then the value of the notification frequency. Set
1428 // max_freq_bits accordingly.
1429 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1430 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1431 if (scaled_freq == 0) {
1432 // Return 0 right away to avoid calculating log2 of 0.
1433 return 0;
1434 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1435 return max_freq_bits;
1436 } else {
1437 return log2_intptr(scaled_freq);
1438 }
1439 }
1440
1441 void Arguments::set_tiered_flags() {
1442 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1443 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1444 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1445 }
1446 if (CompilationPolicyChoice < 2) {
1447 vm_exit_during_initialization(
1448 "Incompatible compilation policy selected", NULL);
1449 }
1450 // Increase the code cache size - tiered compiles a lot more.
1451 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1452 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1453 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1454 }
1455 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1456 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1457 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1458 }
1459 if (!UseInterpreter) { // -Xcomp
1460 Tier3InvokeNotifyFreqLog = 0;
1461 Tier4InvocationThreshold = 0;
1462 }
1463
1464 if (CompileThresholdScaling < 0) {
1465 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1466 }
1467
1468 // Scale tiered compilation thresholds.
1469 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1470 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1471 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1472 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1473
1474 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1475 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1476 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1477 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1478
1479 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1480 // once these thresholds become supported.
1481
1482 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1483 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1484
1485 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1486 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1487
1488 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1489
1490 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1491 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1492 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1493 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1494 }
1495 }
1496
1497 #if INCLUDE_ALL_GCS
1498 static void disable_adaptive_size_policy(const char* collector_name) {
1499 if (UseAdaptiveSizePolicy) {
1500 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1501 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1502 collector_name);
1503 }
1504 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1505 }
1506 }
1507
1508 void Arguments::set_parnew_gc_flags() {
1509 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1510 "control point invariant");
1511 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1512
1513 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1514 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1515 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1516 } else if (ParallelGCThreads == 0) {
1517 jio_fprintf(defaultStream::error_stream(),
1518 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1519 vm_exit(1);
1520 }
1521
1522 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1523 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1524 // we set them to 1024 and 1024.
1525 // See CR 6362902.
1526 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1527 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1528 }
1529 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1530 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1531 }
1532
1533 // When using compressed oops, we use local overflow stacks,
1534 // rather than using a global overflow list chained through
1535 // the klass word of the object's pre-image.
1536 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1537 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1538 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1539 }
1540 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1541 }
1542 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1543 }
1544
1545 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1546 // sparc/solaris for certain applications, but would gain from
1547 // further optimization and tuning efforts, and would almost
1548 // certainly gain from analysis of platform and environment.
1549 void Arguments::set_cms_and_parnew_gc_flags() {
1550 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1551 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1552
1553 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1554 disable_adaptive_size_policy("UseConcMarkSweepGC");
1555
1556 set_parnew_gc_flags();
1557
1558 size_t max_heap = align_size_down(MaxHeapSize,
1559 CardTableRS::ct_max_alignment_constraint());
1560
1561 // Now make adjustments for CMS
1562 intx tenuring_default = (intx)6;
1563 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1564
1565 // Preferred young gen size for "short" pauses:
1566 // upper bound depends on # of threads and NewRatio.
1567 const size_t preferred_max_new_size_unaligned =
1568 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1569 size_t preferred_max_new_size =
1570 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1571
1572 // Unless explicitly requested otherwise, size young gen
1573 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1574
1575 // If either MaxNewSize or NewRatio is set on the command line,
1576 // assume the user is trying to set the size of the young gen.
1577 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1578
1579 // Set MaxNewSize to our calculated preferred_max_new_size unless
1580 // NewSize was set on the command line and it is larger than
1581 // preferred_max_new_size.
1582 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1583 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1584 } else {
1585 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1586 }
1587 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1588
1589 // Code along this path potentially sets NewSize and OldSize
1590 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1591 min_heap_size(), InitialHeapSize, max_heap);
1592 size_t min_new = preferred_max_new_size;
1593 if (FLAG_IS_CMDLINE(NewSize)) {
1594 min_new = NewSize;
1595 }
1596 if (max_heap > min_new && min_heap_size() > min_new) {
1597 // Unless explicitly requested otherwise, make young gen
1598 // at least min_new, and at most preferred_max_new_size.
1599 if (FLAG_IS_DEFAULT(NewSize)) {
1600 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1601 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1602 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1603 }
1604 // Unless explicitly requested otherwise, size old gen
1605 // so it's NewRatio x of NewSize.
1606 if (FLAG_IS_DEFAULT(OldSize)) {
1607 if (max_heap > NewSize) {
1608 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1609 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1610 }
1611 }
1612 }
1613 }
1614 // Unless explicitly requested otherwise, definitely
1615 // promote all objects surviving "tenuring_default" scavenges.
1616 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1617 FLAG_IS_DEFAULT(SurvivorRatio)) {
1618 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1619 }
1620 // If we decided above (or user explicitly requested)
1621 // `promote all' (via MaxTenuringThreshold := 0),
1622 // prefer minuscule survivor spaces so as not to waste
1623 // space for (non-existent) survivors
1624 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1625 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1626 }
1627
1628 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1629 // but rather the number of free blocks of a given size that are used when
1630 // replenishing the local per-worker free list caches.
1631 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1632 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1633 // OldPLAB sizing manually turned off: Use a larger default setting,
1634 // unless it was manually specified. This is because a too-low value
1635 // will slow down scavenges.
1636 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1637 } else {
1638 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1639 }
1640 }
1641
1642 // If either of the static initialization defaults have changed, note this
1643 // modification.
1644 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1645 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1646 }
1647
1648 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1649 }
1650 #endif // INCLUDE_ALL_GCS
1651
1652 void set_object_alignment() {
1653 // Object alignment.
1654 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1655 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1656 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1657 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1658 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1659 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1660
1661 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1662 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1663
1664 // Oop encoding heap max
1665 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1666
1667 if (SurvivorAlignmentInBytes == 0) {
1668 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1669 }
1670
1671 #if INCLUDE_ALL_GCS
1672 // Set CMS global values
1673 CompactibleFreeListSpace::set_cms_values();
1674 #endif // INCLUDE_ALL_GCS
1675 }
1676
1677 size_t Arguments::max_heap_for_compressed_oops() {
1678 // Avoid sign flip.
1679 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1680 // We need to fit both the NULL page and the heap into the memory budget, while
1681 // keeping alignment constraints of the heap. To guarantee the latter, as the
1682 // NULL page is located before the heap, we pad the NULL page to the conservative
1683 // maximum alignment that the GC may ever impose upon the heap.
1684 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1685 _conservative_max_heap_alignment);
1686
1687 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1688 NOT_LP64(ShouldNotReachHere(); return 0);
1689 }
1690
1691 void Arguments::set_use_compressed_oops() {
1692 #ifndef ZERO
1693 #ifdef _LP64
1694 // MaxHeapSize is not set up properly at this point, but
1695 // the only value that can override MaxHeapSize if we are
1696 // to use UseCompressedOops is InitialHeapSize.
1697 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1698
1699 if (max_heap_size <= max_heap_for_compressed_oops()) {
1700 #if !defined(COMPILER1) || defined(TIERED)
1701 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1702 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1703 }
1704 #endif
1705 } else {
1706 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1707 warning("Max heap size too large for Compressed Oops");
1708 FLAG_SET_DEFAULT(UseCompressedOops, false);
1709 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1710 }
1711 }
1712 #endif // _LP64
1713 #endif // ZERO
1714 }
1715
1716
1717 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1718 // set_use_compressed_oops().
1719 void Arguments::set_use_compressed_klass_ptrs() {
1720 #ifndef ZERO
1721 #ifdef _LP64
1722 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1723 if (!UseCompressedOops) {
1724 if (UseCompressedClassPointers) {
1725 warning("UseCompressedClassPointers requires UseCompressedOops");
1726 }
1727 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1728 } else {
1729 // Turn on UseCompressedClassPointers too
1730 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1731 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1732 }
1733 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1734 if (UseCompressedClassPointers) {
1735 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1736 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1737 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1738 }
1739 }
1740 }
1741 #endif // _LP64
1742 #endif // !ZERO
1743 }
1744
1745 void Arguments::set_conservative_max_heap_alignment() {
1746 // The conservative maximum required alignment for the heap is the maximum of
1747 // the alignments imposed by several sources: any requirements from the heap
1748 // itself, the collector policy and the maximum page size we may run the VM
1749 // with.
1750 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1751 #if INCLUDE_ALL_GCS
1752 if (UseParallelGC) {
1753 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1754 } else if (UseG1GC) {
1755 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1756 }
1757 #endif // INCLUDE_ALL_GCS
1758 _conservative_max_heap_alignment = MAX4(heap_alignment,
1759 (size_t)os::vm_allocation_granularity(),
1760 os::max_page_size(),
1761 CollectorPolicy::compute_heap_alignment());
1762 }
1763
1764 bool Arguments::gc_selected() {
1765 #if INCLUDE_ALL_GCS
1766 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1767 #else
1768 return UseSerialGC;
1769 #endif // INCLUDE_ALL_GCS
1770 }
1771
1772 #ifdef TIERED
1773 bool Arguments::compilation_mode_selected() {
1774 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1775 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1776
1777 }
1778
1779 void Arguments::select_compilation_mode_ergonomically() {
1780 #if defined(_WINDOWS) && !defined(_LP64)
1781 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1782 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1783 }
1784 #endif
1785 if (NeverActAsServerClassMachine) {
1786 set_client_compilation_mode();
1787 }
1788 }
1789 #endif //TIERED
1790
1791 void Arguments::select_gc_ergonomically() {
1792 #if INCLUDE_ALL_GCS
1793 if (os::is_server_class_machine()) {
1794 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1795 } else {
1796 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1797 }
1798 #else
1799 UNSUPPORTED_OPTION(UseG1GC);
1800 UNSUPPORTED_OPTION(UseParallelGC);
1801 UNSUPPORTED_OPTION(UseParallelOldGC);
1802 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1803 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1804 #endif // INCLUDE_ALL_GCS
1805 }
1806
1807 void Arguments::select_gc() {
1808 if (!gc_selected()) {
1809 select_gc_ergonomically();
1810 if (!gc_selected()) {
1811 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1812 }
1813 }
1814 }
1815
1816 #if INCLUDE_JVMCI
1817 void Arguments::set_jvmci_specific_flags() {
1818 if (UseJVMCICompiler) {
1819 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1820 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1821 }
1822 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1823 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1824 }
1825 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1826 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1827 }
1828 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1829 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1830 }
1831 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1832 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1833 }
1834 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1835 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1836 }
1837 if (TieredStopAtLevel != CompLevel_full_optimization) {
1838 // Currently JVMCI compiler can only work at the full optimization level
1839 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1840 TieredStopAtLevel = CompLevel_full_optimization;
1841 }
1842 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1843 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1844 }
1845 }
1846 }
1847 #endif
1848
1849 void Arguments::set_ergonomics_flags() {
1850 #ifdef TIERED
1851 if (!compilation_mode_selected()) {
1852 select_compilation_mode_ergonomically();
1853 }
1854 #endif
1855 select_gc();
1856
1857 #if defined(COMPILER2) || INCLUDE_JVMCI
1858 // Shared spaces work fine with other GCs but causes bytecode rewriting
1859 // to be disabled, which hurts interpreter performance and decreases
1860 // server performance. When -server is specified, keep the default off
1861 // unless it is asked for. Future work: either add bytecode rewriting
1862 // at link time, or rewrite bytecodes in non-shared methods.
1863 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1864 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1865 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1866 }
1867 #endif
1868
1869 set_conservative_max_heap_alignment();
1870
1871 #ifndef ZERO
1872 #ifdef _LP64
1873 set_use_compressed_oops();
1874
1875 // set_use_compressed_klass_ptrs() must be called after calling
1876 // set_use_compressed_oops().
1877 set_use_compressed_klass_ptrs();
1878
1879 // Also checks that certain machines are slower with compressed oops
1880 // in vm_version initialization code.
1881 #endif // _LP64
1882 #endif // !ZERO
1883
1884 }
1885
1886 void Arguments::set_parallel_gc_flags() {
1887 assert(UseParallelGC || UseParallelOldGC, "Error");
1888 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1889 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1890 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1891 }
1892 FLAG_SET_DEFAULT(UseParallelGC, true);
1893
1894 // If no heap maximum was requested explicitly, use some reasonable fraction
1895 // of the physical memory, up to a maximum of 1GB.
1896 FLAG_SET_DEFAULT(ParallelGCThreads,
1897 Abstract_VM_Version::parallel_worker_threads());
1898 if (ParallelGCThreads == 0) {
1899 jio_fprintf(defaultStream::error_stream(),
1900 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1901 vm_exit(1);
1902 }
1903
1904 if (UseAdaptiveSizePolicy) {
1905 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1906 // unless the user actually sets these flags.
1907 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1908 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1909 }
1910 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1911 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1912 }
1913 }
1914
1915 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1916 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1917 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1918 // See CR 6362902 for details.
1919 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1920 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1921 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1922 }
1923 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1924 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1925 }
1926 }
1927
1928 if (UseParallelOldGC) {
1929 // Par compact uses lower default values since they are treated as
1930 // minimums. These are different defaults because of the different
1931 // interpretation and are not ergonomically set.
1932 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1933 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1934 }
1935 }
1936 }
1937
1938 void Arguments::set_g1_gc_flags() {
1939 assert(UseG1GC, "Error");
1940 #if defined(COMPILER1) || INCLUDE_JVMCI
1941 FastTLABRefill = false;
1942 #endif
1943 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1944 if (ParallelGCThreads == 0) {
1945 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1946 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1947 }
1948
1949 #if INCLUDE_ALL_GCS
1950 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1951 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1952 }
1953 #endif
1954
1955 // MarkStackSize will be set (if it hasn't been set by the user)
1956 // when concurrent marking is initialized.
1957 // Its value will be based upon the number of parallel marking threads.
1958 // But we do set the maximum mark stack size here.
1959 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1960 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1961 }
1962
1963 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1964 // In G1, we want the default GC overhead goal to be higher than
1965 // it is for PS, or the heap might be expanded too aggressively.
1966 // We set it here to ~8%.
1967 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1968 }
1969
1970 // Below, we might need to calculate the pause time interval based on
1971 // the pause target. When we do so we are going to give G1 maximum
1972 // flexibility and allow it to do pauses when it needs to. So, we'll
1973 // arrange that the pause interval to be pause time target + 1 to
1974 // ensure that a) the pause time target is maximized with respect to
1975 // the pause interval and b) we maintain the invariant that pause
1976 // time target < pause interval. If the user does not want this
1977 // maximum flexibility, they will have to set the pause interval
1978 // explicitly.
1979
1980 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1981 // The default pause time target in G1 is 200ms
1982 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1983 }
1984
1985 // Then, if the interval parameter was not set, set it according to
1986 // the pause time target (this will also deal with the case when the
1987 // pause time target is the default value).
1988 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1989 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1990 }
1991
1992 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1993 }
1994
1995 void Arguments::set_gc_specific_flags() {
1996 #if INCLUDE_ALL_GCS
1997 // Set per-collector flags
1998 if (UseParallelGC || UseParallelOldGC) {
1999 set_parallel_gc_flags();
2000 } else if (UseConcMarkSweepGC) {
2001 set_cms_and_parnew_gc_flags();
2002 } else if (UseG1GC) {
2003 set_g1_gc_flags();
2004 }
2005 if (AssumeMP && !UseSerialGC) {
2006 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2007 warning("If the number of processors is expected to increase from one, then"
2008 " you should configure the number of parallel GC threads appropriately"
2009 " using -XX:ParallelGCThreads=N");
2010 }
2011 }
2012 if (MinHeapFreeRatio == 100) {
2013 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2014 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2015 }
2016
2017 // If class unloading is disabled, also disable concurrent class unloading.
2018 if (!ClassUnloading) {
2019 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2020 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2021 }
2022 #endif // INCLUDE_ALL_GCS
2023 }
2024
2025 julong Arguments::limit_by_allocatable_memory(julong limit) {
2026 julong max_allocatable;
2027 julong result = limit;
2028 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2029 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2030 }
2031 return result;
2032 }
2033
2034 // Use static initialization to get the default before parsing
2035 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2036
2037 void Arguments::set_heap_size() {
2038 julong phys_mem =
2039 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2040 : (julong)MaxRAM;
2041
2042 // Experimental support for CGroup memory limits
2043 if (UseCGroupMemoryLimitForHeap) {
2044 // This is a rough indicator that a CGroup limit may be in force
2045 // for this process
2046 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
2047 FILE *fp = fopen(lim_file, "r");
2048 if (fp != NULL) {
2049 julong cgroup_max = 0;
2050 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2051 if (ret == 1 && cgroup_max > 0) {
2052 // If unlimited, cgroup_max will be a very large, but unspecified
2053 // value, so use initial phys_mem as a limit
2054 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
2055 JULONG_FORMAT "MB) and initial phys_mem ("
2056 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2057 phys_mem = MIN2(cgroup_max, phys_mem);
2058 } else {
2059 warning("Unable to read/parse cgroup memory limit from %s: %s",
2060 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2061 }
2062 fclose(fp);
2063 } else {
2064 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2065 }
2066 }
2067
2068 // If the maximum heap size has not been set with -Xmx,
2069 // then set it as fraction of the size of physical memory,
2070 // respecting the maximum and minimum sizes of the heap.
2071 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2072 julong reasonable_max = phys_mem / MaxRAMFraction;
2073
2074 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2075 // Small physical memory, so use a minimum fraction of it for the heap
2076 reasonable_max = phys_mem / MinRAMFraction;
2077 } else {
2078 // Not-small physical memory, so require a heap at least
2079 // as large as MaxHeapSize
2080 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2081 }
2082 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2083 // Limit the heap size to ErgoHeapSizeLimit
2084 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2085 }
2086 if (UseCompressedOops) {
2087 // Limit the heap size to the maximum possible when using compressed oops
2088 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2089
2090 // HeapBaseMinAddress can be greater than default but not less than.
2091 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2092 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2093 // matches compressed oops printing flags
2094 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2095 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2096 DefaultHeapBaseMinAddress,
2097 DefaultHeapBaseMinAddress/G,
2098 HeapBaseMinAddress);
2099 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2100 }
2101 }
2102
2103 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2104 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2105 // but it should be not less than default MaxHeapSize.
2106 max_coop_heap -= HeapBaseMinAddress;
2107 }
2108 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2109 }
2110 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2111
2112 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2113 // An initial heap size was specified on the command line,
2114 // so be sure that the maximum size is consistent. Done
2115 // after call to limit_by_allocatable_memory because that
2116 // method might reduce the allocation size.
2117 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2118 }
2119
2120 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2121 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2122 }
2123
2124 // If the minimum or initial heap_size have not been set or requested to be set
2125 // ergonomically, set them accordingly.
2126 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2127 julong reasonable_minimum = (julong)(OldSize + NewSize);
2128
2129 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2130
2131 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2132
2133 if (InitialHeapSize == 0) {
2134 julong reasonable_initial = phys_mem / InitialRAMFraction;
2135
2136 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2137 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2138
2139 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2140
2141 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2142 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2143 }
2144 // If the minimum heap size has not been set (via -Xms),
2145 // synchronize with InitialHeapSize to avoid errors with the default value.
2146 if (min_heap_size() == 0) {
2147 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2148 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2149 }
2150 }
2151 }
2152
2153 // This option inspects the machine and attempts to set various
2154 // parameters to be optimal for long-running, memory allocation
2155 // intensive jobs. It is intended for machines with large
2156 // amounts of cpu and memory.
2157 jint Arguments::set_aggressive_heap_flags() {
2158 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2159 // VM, but we may not be able to represent the total physical memory
2160 // available (like having 8gb of memory on a box but using a 32bit VM).
2161 // Thus, we need to make sure we're using a julong for intermediate
2162 // calculations.
2163 julong initHeapSize;
2164 julong total_memory = os::physical_memory();
2165
2166 if (total_memory < (julong) 256 * M) {
2167 jio_fprintf(defaultStream::error_stream(),
2168 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2169 vm_exit(1);
2170 }
2171
2172 // The heap size is half of available memory, or (at most)
2173 // all of possible memory less 160mb (leaving room for the OS
2174 // when using ISM). This is the maximum; because adaptive sizing
2175 // is turned on below, the actual space used may be smaller.
2176
2177 initHeapSize = MIN2(total_memory / (julong) 2,
2178 total_memory - (julong) 160 * M);
2179
2180 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2181
2182 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2183 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2184 return JNI_EINVAL;
2185 }
2186 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2187 return JNI_EINVAL;
2188 }
2189 // Currently the minimum size and the initial heap sizes are the same.
2190 set_min_heap_size(initHeapSize);
2191 }
2192 if (FLAG_IS_DEFAULT(NewSize)) {
2193 // Make the young generation 3/8ths of the total heap.
2194 if (FLAG_SET_CMDLINE(size_t, NewSize,
2195 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2196 return JNI_EINVAL;
2197 }
2198 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2199 return JNI_EINVAL;
2200 }
2201 }
2202
2203 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2204 FLAG_SET_DEFAULT(UseLargePages, true);
2205 #endif
2206
2207 // Increase some data structure sizes for efficiency
2208 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2209 return JNI_EINVAL;
2210 }
2211 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2212 return JNI_EINVAL;
2213 }
2214 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2215 return JNI_EINVAL;
2216 }
2217
2218 // See the OldPLABSize comment below, but replace 'after promotion'
2219 // with 'after copying'. YoungPLABSize is the size of the survivor
2220 // space per-gc-thread buffers. The default is 4kw.
2221 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2222 return JNI_EINVAL;
2223 }
2224
2225 // OldPLABSize is the size of the buffers in the old gen that
2226 // UseParallelGC uses to promote live data that doesn't fit in the
2227 // survivor spaces. At any given time, there's one for each gc thread.
2228 // The default size is 1kw. These buffers are rarely used, since the
2229 // survivor spaces are usually big enough. For specjbb, however, there
2230 // are occasions when there's lots of live data in the young gen
2231 // and we end up promoting some of it. We don't have a definite
2232 // explanation for why bumping OldPLABSize helps, but the theory
2233 // is that a bigger PLAB results in retaining something like the
2234 // original allocation order after promotion, which improves mutator
2235 // locality. A minor effect may be that larger PLABs reduce the
2236 // number of PLAB allocation events during gc. The value of 8kw
2237 // was arrived at by experimenting with specjbb.
2238 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2239 return JNI_EINVAL;
2240 }
2241
2242 // Enable parallel GC and adaptive generation sizing
2243 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2244 return JNI_EINVAL;
2245 }
2246
2247 // Encourage steady state memory management
2248 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2249 return JNI_EINVAL;
2250 }
2251
2252 // This appears to improve mutator locality
2253 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2254 return JNI_EINVAL;
2255 }
2256
2257 // Get around early Solaris scheduling bug
2258 // (affinity vs other jobs on system)
2259 // but disallow DR and offlining (5008695).
2260 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2261 return JNI_EINVAL;
2262 }
2263
2264 return JNI_OK;
2265 }
2266
2267 // This must be called after ergonomics.
2268 void Arguments::set_bytecode_flags() {
2269 if (!RewriteBytecodes) {
2270 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2271 }
2272 }
2273
2274 // Aggressive optimization flags -XX:+AggressiveOpts
2275 jint Arguments::set_aggressive_opts_flags() {
2276 #ifdef COMPILER2
2277 if (AggressiveUnboxing) {
2278 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2279 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2280 } else if (!EliminateAutoBox) {
2281 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2282 AggressiveUnboxing = false;
2283 }
2284 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2285 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2286 } else if (!DoEscapeAnalysis) {
2287 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2288 AggressiveUnboxing = false;
2289 }
2290 }
2291 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2292 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2293 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2294 }
2295 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2296 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2297 }
2298
2299 // Feed the cache size setting into the JDK
2300 char buffer[1024];
2301 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2302 if (!add_property(buffer)) {
2303 return JNI_ENOMEM;
2304 }
2305 }
2306 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2307 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2308 }
2309 #endif
2310
2311 if (AggressiveOpts) {
2312 // Sample flag setting code
2313 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2314 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2315 // }
2316 }
2317
2318 return JNI_OK;
2319 }
2320
2321 //===========================================================================================================
2322 // Parsing of java.compiler property
2323
2324 void Arguments::process_java_compiler_argument(const char* arg) {
2325 // For backwards compatibility, Djava.compiler=NONE or ""
2326 // causes us to switch to -Xint mode UNLESS -Xdebug
2327 // is also specified.
2328 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2329 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2330 }
2331 }
2332
2333 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2334 _sun_java_launcher = os::strdup_check_oom(launcher);
2335 }
2336
2337 bool Arguments::created_by_java_launcher() {
2338 assert(_sun_java_launcher != NULL, "property must have value");
2339 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2340 }
2341
2342 bool Arguments::sun_java_launcher_is_altjvm() {
2343 return _sun_java_launcher_is_altjvm;
2344 }
2345
2346 //===========================================================================================================
2347 // Parsing of main arguments
2348
2349 #if INCLUDE_JVMCI
2350 // Check consistency of jvmci vm argument settings.
2351 bool Arguments::check_jvmci_args_consistency() {
2352 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2353 }
2354 #endif //INCLUDE_JVMCI
2355
2356 // Check consistency of GC selection
2357 bool Arguments::check_gc_consistency() {
2358 // Ensure that the user has not selected conflicting sets
2359 // of collectors.
2360 uint i = 0;
2361 if (UseSerialGC) i++;
2362 if (UseConcMarkSweepGC) i++;
2363 if (UseParallelGC || UseParallelOldGC) i++;
2364 if (UseG1GC) i++;
2365 if (i > 1) {
2366 jio_fprintf(defaultStream::error_stream(),
2367 "Conflicting collector combinations in option list; "
2368 "please refer to the release notes for the combinations "
2369 "allowed\n");
2370 return false;
2371 }
2372
2373 return true;
2374 }
2375
2376 // Check the consistency of vm_init_args
2377 bool Arguments::check_vm_args_consistency() {
2378 // Method for adding checks for flag consistency.
2379 // The intent is to warn the user of all possible conflicts,
2380 // before returning an error.
2381 // Note: Needs platform-dependent factoring.
2382 bool status = true;
2383
2384 if (TLABRefillWasteFraction == 0) {
2385 jio_fprintf(defaultStream::error_stream(),
2386 "TLABRefillWasteFraction should be a denominator, "
2387 "not " SIZE_FORMAT "\n",
2388 TLABRefillWasteFraction);
2389 status = false;
2390 }
2391
2392 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2393 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2394 }
2395
2396 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2397 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2398 }
2399
2400 if (GCTimeLimit == 100) {
2401 // Turn off gc-overhead-limit-exceeded checks
2402 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2403 }
2404
2405 status = status && check_gc_consistency();
2406
2407 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2408 // insists that we hold the requisite locks so that the iteration is
2409 // MT-safe. For the verification at start-up and shut-down, we don't
2410 // yet have a good way of acquiring and releasing these locks,
2411 // which are not visible at the CollectedHeap level. We want to
2412 // be able to acquire these locks and then do the iteration rather
2413 // than just disable the lock verification. This will be fixed under
2414 // bug 4788986.
2415 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2416 if (VerifyDuringStartup) {
2417 warning("Heap verification at start-up disabled "
2418 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2419 VerifyDuringStartup = false; // Disable verification at start-up
2420 }
2421
2422 if (VerifyBeforeExit) {
2423 warning("Heap verification at shutdown disabled "
2424 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2425 VerifyBeforeExit = false; // Disable verification at shutdown
2426 }
2427 }
2428
2429 if (PrintNMTStatistics) {
2430 #if INCLUDE_NMT
2431 if (MemTracker::tracking_level() == NMT_off) {
2432 #endif // INCLUDE_NMT
2433 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2434 PrintNMTStatistics = false;
2435 #if INCLUDE_NMT
2436 }
2437 #endif
2438 }
2439
2440 #if INCLUDE_JVMCI
2441 status = status && check_jvmci_args_consistency();
2442
2443 if (EnableJVMCI) {
2444 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2445 AddProperty, UnwriteableProperty, InternalProperty);
2446
2447 if (!ScavengeRootsInCode) {
2448 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2449 ScavengeRootsInCode = 1;
2450 }
2451 }
2452 #endif
2453
2454 // Check lower bounds of the code cache
2455 // Template Interpreter code is approximately 3X larger in debug builds.
2456 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2457 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2460 os::vm_page_size()/K);
2461 status = false;
2462 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2463 jio_fprintf(defaultStream::error_stream(),
2464 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2465 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2466 status = false;
2467 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2468 jio_fprintf(defaultStream::error_stream(),
2469 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2470 min_code_cache_size/K);
2471 status = false;
2472 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2473 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2474 jio_fprintf(defaultStream::error_stream(),
2475 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2476 CODE_CACHE_SIZE_LIMIT/M);
2477 status = false;
2478 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2479 jio_fprintf(defaultStream::error_stream(),
2480 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2481 min_code_cache_size/K);
2482 status = false;
2483 }
2484
2485 #ifdef _LP64
2486 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2487 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2488 }
2489 #endif
2490
2491 #ifndef SUPPORT_RESERVED_STACK_AREA
2492 if (StackReservedPages != 0) {
2493 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2494 warning("Reserved Stack Area not supported on this platform");
2495 }
2496 #endif
2497
2498 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2499 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2500 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2501 }
2502 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2503 }
2504 if (UseCompiler && is_interpreter_only()) {
2505 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2506 warning("UseCompiler disabled due to -Xint.");
2507 }
2508 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2509 }
2510 #ifdef COMPILER2
2511 if (PostLoopMultiversioning && !RangeCheckElimination) {
2512 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2513 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2514 }
2515 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2516 }
2517 #endif
2518 return status;
2519 }
2520
2521 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2522 const char* option_type) {
2523 if (ignore) return false;
2524
2525 const char* spacer = " ";
2526 if (option_type == NULL) {
2527 option_type = ++spacer; // Set both to the empty string.
2528 }
2529
2530 if (os::obsolete_option(option)) {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Obsolete %s%soption: %s\n", option_type, spacer,
2533 option->optionString);
2534 return false;
2535 } else {
2536 jio_fprintf(defaultStream::error_stream(),
2537 "Unrecognized %s%soption: %s\n", option_type, spacer,
2538 option->optionString);
2539 return true;
2540 }
2541 }
2542
2543 static const char* user_assertion_options[] = {
2544 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2545 };
2546
2547 static const char* system_assertion_options[] = {
2548 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2549 };
2550
2551 bool Arguments::parse_uintx(const char* value,
2552 uintx* uintx_arg,
2553 uintx min_size) {
2554
2555 // Check the sign first since atojulong() parses only unsigned values.
2556 bool value_is_positive = !(*value == '-');
2557
2558 if (value_is_positive) {
2559 julong n;
2560 bool good_return = atojulong(value, &n);
2561 if (good_return) {
2562 bool above_minimum = n >= min_size;
2563 bool value_is_too_large = n > max_uintx;
2564
2565 if (above_minimum && !value_is_too_large) {
2566 *uintx_arg = n;
2567 return true;
2568 }
2569 }
2570 }
2571 return false;
2572 }
2573
2574 unsigned int addreads_count = 0;
2575 unsigned int addexports_count = 0;
2576 unsigned int addopens_count = 0;
2577 unsigned int addmods_count = 0;
2578 unsigned int patch_mod_count = 0;
2579
2580 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2581 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2582 char* property = AllocateHeap(prop_len, mtArguments);
2583 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2584 if (ret < 0 || ret >= (int)prop_len) {
2585 FreeHeap(property);
2586 return false;
2587 }
2588 bool added = add_property(property, UnwriteableProperty, internal);
2589 FreeHeap(property);
2590 return added;
2591 }
2592
2593 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2594 const unsigned int props_count_limit = 1000;
2595 const int max_digits = 3;
2596 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2597
2598 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2599 if (count < props_count_limit) {
2600 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2601 char* property = AllocateHeap(prop_len, mtArguments);
2602 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2603 if (ret < 0 || ret >= (int)prop_len) {
2604 FreeHeap(property);
2605 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2606 return false;
2607 }
2608 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2609 FreeHeap(property);
2610 return added;
2611 }
2612
2613 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2614 return false;
2615 }
2616
2617 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2618 julong* long_arg,
2619 julong min_size,
2620 julong max_size) {
2621 if (!atojulong(s, long_arg)) return arg_unreadable;
2622 return check_memory_size(*long_arg, min_size, max_size);
2623 }
2624
2625 // Parse JavaVMInitArgs structure
2626
2627 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2628 const JavaVMInitArgs *java_options_args,
2629 const JavaVMInitArgs *cmd_line_args) {
2630 bool patch_mod_javabase = false;
2631
2632 // Save default settings for some mode flags
2633 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2634 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2635 Arguments::_ClipInlining = ClipInlining;
2636 Arguments::_BackgroundCompilation = BackgroundCompilation;
2637 if (TieredCompilation) {
2638 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2639 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2640 }
2641
2642 // Setup flags for mixed which is the default
2643 set_mode_flags(_mixed);
2644
2645 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2646 // variable (if present).
2647 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2648 if (result != JNI_OK) {
2649 return result;
2650 }
2651
2652 // Parse args structure generated from the command line flags.
2653 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2654 if (result != JNI_OK) {
2655 return result;
2656 }
2657
2658 // Parse args structure generated from the _JAVA_OPTIONS environment
2659 // variable (if present) (mimics classic VM)
2660 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2661 if (result != JNI_OK) {
2662 return result;
2663 }
2664
2665 // Do final processing now that all arguments have been parsed
2666 result = finalize_vm_init_args();
2667 if (result != JNI_OK) {
2668 return result;
2669 }
2670
2671 #if INCLUDE_CDS
2672 if (UseSharedSpaces && patch_mod_javabase) {
2673 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2674 }
2675 #endif
2676
2677 return JNI_OK;
2678 }
2679
2680 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2681 // represents a valid JDWP agent. is_path==true denotes that we
2682 // are dealing with -agentpath (case where name is a path), otherwise with
2683 // -agentlib
2684 bool valid_jdwp_agent(char *name, bool is_path) {
2685 char *_name;
2686 const char *_jdwp = "jdwp";
2687 size_t _len_jdwp, _len_prefix;
2688
2689 if (is_path) {
2690 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2691 return false;
2692 }
2693
2694 _name++; // skip past last path separator
2695 _len_prefix = strlen(JNI_LIB_PREFIX);
2696
2697 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2698 return false;
2699 }
2700
2701 _name += _len_prefix;
2702 _len_jdwp = strlen(_jdwp);
2703
2704 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2705 _name += _len_jdwp;
2706 }
2707 else {
2708 return false;
2709 }
2710
2711 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2712 return false;
2713 }
2714
2715 return true;
2716 }
2717
2718 if (strcmp(name, _jdwp) == 0) {
2719 return true;
2720 }
2721
2722 return false;
2723 }
2724
2725 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2726 // --patch-module=<module>=<file>(<pathsep><file>)*
2727 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2728 // Find the equal sign between the module name and the path specification
2729 const char* module_equal = strchr(patch_mod_tail, '=');
2730 if (module_equal == NULL) {
2731 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2732 return JNI_ERR;
2733 } else {
2734 // Pick out the module name
2735 size_t module_len = module_equal - patch_mod_tail;
2736 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2737 if (module_name != NULL) {
2738 memcpy(module_name, patch_mod_tail, module_len);
2739 *(module_name + module_len) = '\0';
2740 // The path piece begins one past the module_equal sign
2741 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2742 FREE_C_HEAP_ARRAY(char, module_name);
2743 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2744 return JNI_ENOMEM;
2745 }
2746 } else {
2747 return JNI_ENOMEM;
2748 }
2749 }
2750 return JNI_OK;
2751 }
2752
2753 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2754 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2755 assert(is_size_aligned_((size_t)os::vm_page_size(), K), "Implementation assumption");
2756
2757 // The min and max sizes match the values in globals.hpp.
2758 const julong min_size = 1000;
2759 // Must limit the max_size to match multiplications
2760 // and alignments in the os_<os>.cpp files, so that
2761 // the calculation stored in a size_t (same size as uintx)
2762 // doesn't overflow.
2763 // Must also make sure that when *value is max_size it
2764 // doesn't overflow intx in the calculation further down
2765 // in this function.
2766 const julong max_ThreadStackSize = align_size_down_((julong)max_uintx, (size_t)os::vm_page_size()) / K;
2767 const julong max_size = max_ThreadStackSize * K;
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_size_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_size_up_(size_in_K * K, (size_t)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, "--permit-illegal-access")) {
2925 if (!create_property("jdk.module.permitIllegalAccess", "true", 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 }