1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvm.h"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/vm_version.hpp"
54 #include "services/management.hpp"
55 #include "services/memTracker.hpp"
56 #include "utilities/align.hpp"
57 #include "utilities/defaultStream.hpp"
58 #include "utilities/macros.hpp"
59 #include "utilities/stringUtils.hpp"
60 #if INCLUDE_JVMCI
61 #include "jvmci/jvmciRuntime.hpp"
62 #endif
63 #if INCLUDE_ALL_GCS
64 #include "gc/cms/compactibleFreeListSpace.hpp"
65 #include "gc/g1/g1CollectedHeap.inline.hpp"
66 #include "gc/parallel/parallelScavengeHeap.hpp"
67 #endif // INCLUDE_ALL_GCS
68
69 // Note: This is a special bug reporting site for the JVM
70 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
71 #define DEFAULT_JAVA_LAUNCHER "generic"
72
73 char* Arguments::_jvm_flags_file = NULL;
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 bool Arguments::_has_profile = false;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 size_t Arguments::_min_heap_size = 0;
84 Arguments::Mode Arguments::_mode = _mixed;
85 bool Arguments::_java_compiler = false;
86 bool Arguments::_xdebug_mode = false;
87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
89 int Arguments::_sun_java_launcher_pid = -1;
90 bool Arguments::_sun_java_launcher_is_altjvm = false;
91
92 // These parameters are reset in method parse_vm_init_args()
93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
95 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
96 bool Arguments::_ClipInlining = ClipInlining;
97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
99
100 char* Arguments::SharedArchivePath = NULL;
101
102 AgentLibraryList Arguments::_libraryList;
103 AgentLibraryList Arguments::_agentList;
104
105 abort_hook_t Arguments::_abort_hook = NULL;
106 exit_hook_t Arguments::_exit_hook = NULL;
107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
108
109
110 SystemProperty *Arguments::_sun_boot_library_path = NULL;
111 SystemProperty *Arguments::_java_library_path = NULL;
112 SystemProperty *Arguments::_java_home = NULL;
113 SystemProperty *Arguments::_java_class_path = NULL;
114 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
115
116 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
117 PathString *Arguments::_system_boot_class_path = NULL;
118 bool Arguments::_has_jimage = false;
119
120 char* Arguments::_ext_dirs = NULL;
121
122 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
123 // part of the option string.
124 static bool match_option(const JavaVMOption *option, const char* name,
125 const char** tail) {
126 size_t len = strlen(name);
127 if (strncmp(option->optionString, name, len) == 0) {
128 *tail = option->optionString + len;
129 return true;
130 } else {
131 return false;
132 }
133 }
134
135 // Check if 'option' matches 'name'. No "tail" is allowed.
136 static bool match_option(const JavaVMOption *option, const char* name) {
137 const char* tail = NULL;
138 bool result = match_option(option, name, &tail);
139 if (tail != NULL && *tail == '\0') {
140 return result;
141 } else {
142 return false;
143 }
144 }
145
146 // Return true if any of the strings in null-terminated array 'names' matches.
147 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
148 // the option must match exactly.
149 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
150 bool tail_allowed) {
151 for (/* empty */; *names != NULL; ++names) {
152 if (match_option(option, *names, tail)) {
153 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
154 return true;
155 }
156 }
157 }
158 return false;
159 }
160
161 static void logOption(const char* opt) {
162 if (PrintVMOptions) {
163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
164 }
165 }
166
167 bool needs_module_property_warning = false;
168
169 #define MODULE_PROPERTY_PREFIX "jdk.module."
170 #define MODULE_PROPERTY_PREFIX_LEN 11
171 #define ADDEXPORTS "addexports"
172 #define ADDEXPORTS_LEN 10
173 #define ADDREADS "addreads"
174 #define ADDREADS_LEN 8
175 #define ADDOPENS "addopens"
176 #define ADDOPENS_LEN 8
177 #define PATCH "patch"
178 #define PATCH_LEN 5
179 #define ADDMODS "addmods"
180 #define ADDMODS_LEN 7
181 #define LIMITMODS "limitmods"
182 #define LIMITMODS_LEN 9
183 #define PATH "path"
184 #define PATH_LEN 4
185 #define UPGRADE_PATH "upgrade.path"
186 #define UPGRADE_PATH_LEN 12
187
188 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
189 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
190 return ((strncmp(option, property, len) == 0) &&
191 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
192 }
193
194 // Return true if property starts with "jdk.module." and its ensuing chars match
195 // any of the reserved module properties.
196 // property should be passed without the leading "-D".
197 bool Arguments::is_internal_module_property(const char* property) {
198 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
199 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
200 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
201 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
202 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
203 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
204 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
205 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
206 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
207 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
208 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
209 return true;
210 }
211 }
212 return false;
213 }
214
215 // Process java launcher properties.
216 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
217 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
218 // sun.java.launcher.pid is defined.
219 // Must do this before setting up other system properties,
220 // as some of them may depend on launcher type.
221 for (int index = 0; index < args->nOptions; index++) {
222 const JavaVMOption* option = args->options + index;
223 const char* tail;
224
225 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
226 process_java_launcher_argument(tail, option->extraInfo);
227 continue;
228 }
229 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
230 if (strcmp(tail, "true") == 0) {
231 _sun_java_launcher_is_altjvm = true;
232 }
233 continue;
234 }
235 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
236 _sun_java_launcher_pid = atoi(tail);
237 continue;
238 }
239 }
240 }
241
242 // Initialize system properties key and value.
243 void Arguments::init_system_properties() {
244
245 // Set up _system_boot_class_path which is not a property but
246 // relies heavily on argument processing and the jdk.boot.class.path.append
247 // property. It is used to store the underlying system boot class path.
248 _system_boot_class_path = new PathString(NULL);
249
250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
251 "Java Virtual Machine Specification", false));
252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
253 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
254 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
255 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
256
257 // Following are JVMTI agent writable properties.
258 // Properties values are set to NULL and they are
259 // os specific they are initialized in os::init_system_properties_values().
260 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
261 _java_library_path = new SystemProperty("java.library.path", NULL, true);
262 _java_home = new SystemProperty("java.home", NULL, true);
263 _java_class_path = new SystemProperty("java.class.path", "", true);
264 // jdk.boot.class.path.append is a non-writeable, internal property.
265 // It can only be set by either:
266 // - -Xbootclasspath/a:
267 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
268 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
269
270 // Add to System Property list.
271 PropertyList_add(&_system_properties, _sun_boot_library_path);
272 PropertyList_add(&_system_properties, _java_library_path);
273 PropertyList_add(&_system_properties, _java_home);
274 PropertyList_add(&_system_properties, _java_class_path);
275 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
276
277 // Set OS specific system properties values
278 os::init_system_properties_values();
279 }
280
281 // Update/Initialize System properties after JDK version number is known
282 void Arguments::init_version_specific_system_properties() {
283 enum { bufsz = 16 };
284 char buffer[bufsz];
285 const char* spec_vendor = "Oracle Corporation";
286 uint32_t spec_version = JDK_Version::current().major_version();
287
288 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
289
290 PropertyList_add(&_system_properties,
291 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
292 PropertyList_add(&_system_properties,
293 new SystemProperty("java.vm.specification.version", buffer, false));
294 PropertyList_add(&_system_properties,
295 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
296 }
297
298 /*
299 * -XX argument processing:
300 *
301 * -XX arguments are defined in several places, such as:
302 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
303 * -XX arguments are parsed in parse_argument().
304 * -XX argument bounds checking is done in check_vm_args_consistency().
305 *
306 * Over time -XX arguments may change. There are mechanisms to handle common cases:
307 *
308 * ALIASED: An option that is simply another name for another option. This is often
309 * part of the process of deprecating a flag, but not all aliases need
310 * to be deprecated.
311 *
312 * Create an alias for an option by adding the old and new option names to the
313 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
314 *
315 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
316 * support may be removed in the future. Both regular and aliased options may be
317 * deprecated.
318 *
319 * Add a deprecation warning for an option (or alias) by adding an entry in the
320 * "special_jvm_flags" table and setting the "deprecated_in" field.
321 * Often an option "deprecated" in one major release will
322 * be made "obsolete" in the next. In this case the entry should also have its
323 * "obsolete_in" field set.
324 *
325 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
326 * on the command line. A warning is printed to let the user know that option might not
327 * be accepted in the future.
328 *
329 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
330 * table and setting the "obsolete_in" field.
331 *
332 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
333 * to the current JDK version. The system will flatly refuse to admit the existence of
334 * the flag. This allows a flag to die automatically over JDK releases.
335 *
336 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
337 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
338 * - Newly obsolete or expired deprecated options should have their global variable
339 * definitions removed (from globals.hpp, etc) and related implementations removed.
340 *
341 * Recommended approach for removing options:
342 *
343 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
344 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
345 *
346 * To remove internal options (e.g. diagnostic, experimental, develop options), use
347 * a 2-step model adding major release numbers to the obsolete and expire columns.
348 *
349 * To change the name of an option, use the alias table as well as a 2-step
350 * model adding major release numbers to the deprecate and expire columns.
351 * Think twice about aliasing commonly used customer options.
352 *
353 * There are times when it is appropriate to leave a future release number as undefined.
354 *
355 * Tests: Aliases should be tested in VMAliasOptions.java.
356 * Deprecated options should be tested in VMDeprecatedOptions.java.
357 */
358
359 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
360 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
361 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
362 // the command-line as usual, but will issue a warning.
363 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
364 // the command-line, while issuing a warning and ignoring the flag value.
365 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
366 // existence of the flag.
367 //
368 // MANUAL CLEANUP ON JDK VERSION UPDATES:
369 // This table ensures that the handling of options will update automatically when the JDK
370 // version is incremented, but the source code needs to be cleanup up manually:
371 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
372 // variable should be removed, as well as users of the variable.
373 // - As "deprecated" options age into "obsolete" options, move the entry into the
374 // "Obsolete Flags" section of the table.
375 // - All expired options should be removed from the table.
376 static SpecialFlag const special_jvm_flags[] = {
377 // -------------- Deprecated Flags --------------
378 // --- Non-alias flags - sorted by obsolete_in then expired_in:
379 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
380 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
381 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
382
383 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
384 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
385 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
386 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
387 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
388
389 // -------------- Obsolete Flags - sorted by expired_in --------------
390 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
391 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
392 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
393 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
394 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
395
396 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
397 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
398 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
399 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
400 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
401 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
402 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
403 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
404 #endif
405
406 { NULL, JDK_Version(0), JDK_Version(0) }
407 };
408
409 // Flags that are aliases for other flags.
410 typedef struct {
411 const char* alias_name;
412 const char* real_name;
413 } AliasedFlag;
414
415 static AliasedFlag const aliased_jvm_flags[] = {
416 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
417 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
418 { NULL, NULL}
419 };
420
421 // NOTE: A compatibility request will be necessary for each alias to be removed.
422 static AliasedLoggingFlag const aliased_logging_flags[] = {
423 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
424 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
425 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
426 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
427 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
428 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
429 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
430 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
431 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
432 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
433 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
434 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
435 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
436 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
437 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
438 };
439
440 #ifndef PRODUCT
441 // These options are removed in jdk9. Remove this code for jdk10.
442 static AliasedFlag const removed_develop_logging_flags[] = {
443 { "TraceClassInitialization", "-Xlog:class+init" },
444 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
445 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
446 { "TraceItables", "-Xlog:itables=debug" },
447 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
448 { "TraceSafepoint", "-Xlog:safepoint=debug" },
449 { "TraceStartupTime", "-Xlog:startuptime" },
450 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
451 { "PrintVtables", "-Xlog:vtables=debug" },
452 { "VerboseVerification", "-Xlog:verification" },
453 { NULL, NULL }
454 };
455 #endif //PRODUCT
456
457 // Return true if "v" is less than "other", where "other" may be "undefined".
458 static bool version_less_than(JDK_Version v, JDK_Version other) {
459 assert(!v.is_undefined(), "must be defined");
460 if (!other.is_undefined() && v.compare(other) >= 0) {
461 return false;
462 } else {
463 return true;
464 }
465 }
466
467 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
468
469 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
470 // Allow extensions to have priority
471 if (lookup_special_flag_ext(flag_name, flag)) {
472 return true;
473 }
474
475 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
476 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
477 flag = special_jvm_flags[i];
478 return true;
479 }
480 }
481 return false;
482 }
483
484 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
485 assert(version != NULL, "Must provide a version buffer");
486 SpecialFlag flag;
487 if (lookup_special_flag(flag_name, flag)) {
488 if (!flag.obsolete_in.is_undefined()) {
489 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
490 *version = flag.obsolete_in;
491 return true;
492 }
493 }
494 }
495 return false;
496 }
497
498 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
499 assert(version != NULL, "Must provide a version buffer");
500 SpecialFlag flag;
501 if (lookup_special_flag(flag_name, flag)) {
502 if (!flag.deprecated_in.is_undefined()) {
503 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
504 version_less_than(JDK_Version::current(), flag.expired_in)) {
505 *version = flag.deprecated_in;
506 return 1;
507 } else {
508 return -1;
509 }
510 }
511 }
512 return 0;
513 }
514
515 #ifndef PRODUCT
516 const char* Arguments::removed_develop_logging_flag_name(const char* name){
517 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
518 const AliasedFlag& flag = removed_develop_logging_flags[i];
519 if (strcmp(flag.alias_name, name) == 0) {
520 return flag.real_name;
521 }
522 }
523 return NULL;
524 }
525 #endif // PRODUCT
526
527 const char* Arguments::real_flag_name(const char *flag_name) {
528 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
529 const AliasedFlag& flag_status = aliased_jvm_flags[i];
530 if (strcmp(flag_status.alias_name, flag_name) == 0) {
531 return flag_status.real_name;
532 }
533 }
534 return flag_name;
535 }
536
537 #ifdef ASSERT
538 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
539 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
540 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
541 return true;
542 }
543 }
544 return false;
545 }
546
547 static bool verify_special_jvm_flags() {
548 bool success = true;
549 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
550 const SpecialFlag& flag = special_jvm_flags[i];
551 if (lookup_special_flag(flag.name, i)) {
552 warning("Duplicate special flag declaration \"%s\"", flag.name);
553 success = false;
554 }
555 if (flag.deprecated_in.is_undefined() &&
556 flag.obsolete_in.is_undefined()) {
557 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
558 success = false;
559 }
560
561 if (!flag.deprecated_in.is_undefined()) {
562 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
563 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
564 success = false;
565 }
566
567 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
568 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
569 success = false;
570 }
571 }
572
573 if (!flag.obsolete_in.is_undefined()) {
574 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
575 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
576 success = false;
577 }
578
579 // if flag has become obsolete it should not have a "globals" flag defined anymore.
580 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
581 if (Flag::find_flag(flag.name) != NULL) {
582 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
583 success = false;
584 }
585 }
586 }
587
588 if (!flag.expired_in.is_undefined()) {
589 // if flag has become expired it should not have a "globals" flag defined anymore.
590 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
591 if (Flag::find_flag(flag.name) != NULL) {
592 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
593 success = false;
594 }
595 }
596 }
597
598 }
599 return success;
600 }
601 #endif
602
603 // Parses a size specification string.
604 bool Arguments::atojulong(const char *s, julong* result) {
605 julong n = 0;
606
607 // First char must be a digit. Don't allow negative numbers or leading spaces.
608 if (!isdigit(*s)) {
609 return false;
610 }
611
612 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
613 char* remainder;
614 errno = 0;
615 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
616 if (errno != 0) {
617 return false;
618 }
619
620 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
621 if (remainder == s || strlen(remainder) > 1) {
622 return false;
623 }
624
625 switch (*remainder) {
626 case 'T': case 't':
627 *result = n * G * K;
628 // Check for overflow.
629 if (*result/((julong)G * K) != n) return false;
630 return true;
631 case 'G': case 'g':
632 *result = n * G;
633 if (*result/G != n) return false;
634 return true;
635 case 'M': case 'm':
636 *result = n * M;
637 if (*result/M != n) return false;
638 return true;
639 case 'K': case 'k':
640 *result = n * K;
641 if (*result/K != n) return false;
642 return true;
643 case '\0':
644 *result = n;
645 return true;
646 default:
647 return false;
648 }
649 }
650
651 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
652 if (size < min_size) return arg_too_small;
653 if (size > max_size) return arg_too_big;
654 return arg_in_range;
655 }
656
657 // Describe an argument out of range error
658 void Arguments::describe_range_error(ArgsRange errcode) {
659 switch(errcode) {
660 case arg_too_big:
661 jio_fprintf(defaultStream::error_stream(),
662 "The specified size exceeds the maximum "
663 "representable size.\n");
664 break;
665 case arg_too_small:
666 case arg_unreadable:
667 case arg_in_range:
668 // do nothing for now
669 break;
670 default:
671 ShouldNotReachHere();
672 }
673 }
674
675 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
676 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
677 return true;
678 } else {
679 return false;
680 }
681 }
682
683 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
684 char* end;
685 errno = 0;
686 double v = strtod(value, &end);
687 if ((errno != 0) || (*end != 0)) {
688 return false;
689 }
690
691 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
692 return true;
693 }
694 return false;
695 }
696
697 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
698 julong v;
699 int int_v;
700 intx intx_v;
701 bool is_neg = false;
702 Flag* result = Flag::find_flag(name, strlen(name));
703
704 if (result == NULL) {
705 return false;
706 }
707
708 // Check the sign first since atojulong() parses only unsigned values.
709 if (*value == '-') {
710 if (!result->is_intx() && !result->is_int()) {
711 return false;
712 }
713 value++;
714 is_neg = true;
715 }
716 if (!Arguments::atojulong(value, &v)) {
717 return false;
718 }
719 if (result->is_int()) {
720 int_v = (int) v;
721 if (is_neg) {
722 int_v = -int_v;
723 }
724 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
725 } else if (result->is_uint()) {
726 uint uint_v = (uint) v;
727 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
728 } else if (result->is_intx()) {
729 intx_v = (intx) v;
730 if (is_neg) {
731 intx_v = -intx_v;
732 }
733 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
734 } else if (result->is_uintx()) {
735 uintx uintx_v = (uintx) v;
736 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
737 } else if (result->is_uint64_t()) {
738 uint64_t uint64_t_v = (uint64_t) v;
739 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
740 } else if (result->is_size_t()) {
741 size_t size_t_v = (size_t) v;
742 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
743 } else if (result->is_double()) {
744 double double_v = (double) v;
745 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
746 } else {
747 return false;
748 }
749 }
750
751 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
752 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
753 // Contract: CommandLineFlags always returns a pointer that needs freeing.
754 FREE_C_HEAP_ARRAY(char, value);
755 return true;
756 }
757
758 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
759 const char* old_value = "";
760 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
761 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
762 size_t new_len = strlen(new_value);
763 const char* value;
764 char* free_this_too = NULL;
765 if (old_len == 0) {
766 value = new_value;
767 } else if (new_len == 0) {
768 value = old_value;
769 } else {
770 size_t length = old_len + 1 + new_len + 1;
771 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
772 // each new setting adds another LINE to the switch:
773 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
774 value = buf;
775 free_this_too = buf;
776 }
777 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
778 // CommandLineFlags always returns a pointer that needs freeing.
779 FREE_C_HEAP_ARRAY(char, value);
780 if (free_this_too != NULL) {
781 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
782 FREE_C_HEAP_ARRAY(char, free_this_too);
783 }
784 return true;
785 }
786
787 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
788 const char* real_name = real_flag_name(arg);
789 JDK_Version since = JDK_Version();
790 switch (is_deprecated_flag(arg, &since)) {
791 case -1:
792 return NULL; // obsolete or expired, don't process normally
793 case 0:
794 return real_name;
795 case 1: {
796 if (warn) {
797 char version[256];
798 since.to_string(version, sizeof(version));
799 if (real_name != arg) {
800 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
801 arg, version, real_name);
802 } else {
803 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
804 arg, version);
805 }
806 }
807 return real_name;
808 }
809 }
810 ShouldNotReachHere();
811 return NULL;
812 }
813
814 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
815 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
816 // Set tagset string buffer at max size of 256, large enough for any alias tagset
817 const int max_tagset_size = 256;
818 int max_tagset_len = max_tagset_size - 1;
819 char tagset_buffer[max_tagset_size];
820 tagset_buffer[0] = '\0';
821
822 // Write tag-set for aliased logging option, in string list form
823 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
824 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
825 if (i > 0) {
826 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
827 }
828 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
829 }
830 if (!alf.exactMatch) {
831 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
832 }
833 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
834 (on) ? "+" : "-",
835 name,
836 tagset_buffer,
837 (on) ? LogLevel::name(alf.level) : "off");
838 }
839
840 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
841 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
842 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
843 if (strcmp(alf.alias_name, name) == 0) {
844 log_deprecated_flag(name, on, alf);
845 return alf;
846 }
847 }
848 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
849 return a;
850 }
851
852 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
853
854 // range of acceptable characters spelled out for portability reasons
855 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
856 #define BUFLEN 255
857 char name[BUFLEN+1];
858 char dummy;
859 const char* real_name;
860 bool warn_if_deprecated = true;
861
862 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
863 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
864 if (alf.alias_name != NULL){
865 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
866 return true;
867 }
868 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
869 if (real_name == NULL) {
870 return false;
871 }
872 return set_bool_flag(real_name, false, origin);
873 }
874 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
875 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
876 if (alf.alias_name != NULL){
877 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
878 return true;
879 }
880 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
881 if (real_name == NULL) {
882 return false;
883 }
884 return set_bool_flag(real_name, true, origin);
885 }
886
887 char punct;
888 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
889 const char* value = strchr(arg, '=') + 1;
890 Flag* flag;
891
892 // this scanf pattern matches both strings (handled here) and numbers (handled later))
893 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
894 if (alf.alias_name != NULL) {
895 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
896 return true;
897 }
898 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
899 if (real_name == NULL) {
900 return false;
901 }
902 flag = Flag::find_flag(real_name);
903 if (flag != NULL && flag->is_ccstr()) {
904 if (flag->ccstr_accumulates()) {
905 return append_to_string_flag(real_name, value, origin);
906 } else {
907 if (value[0] == '\0') {
908 value = NULL;
909 }
910 return set_string_flag(real_name, value, origin);
911 }
912 } else {
913 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
914 }
915 }
916
917 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
918 const char* value = strchr(arg, '=') + 1;
919 // -XX:Foo:=xxx will reset the string flag to the given value.
920 if (value[0] == '\0') {
921 value = NULL;
922 }
923 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
924 if (real_name == NULL) {
925 return false;
926 }
927 return set_string_flag(real_name, value, origin);
928 }
929
930 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
931 #define SIGNED_NUMBER_RANGE "[-0123456789]"
932 #define NUMBER_RANGE "[0123456789eE+-]"
933 char value[BUFLEN + 1];
934 char value2[BUFLEN + 1];
935 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
936 // Looks like a floating-point number -- try again with more lenient format string
937 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
938 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
939 if (real_name == NULL) {
940 return false;
941 }
942 return set_fp_numeric_flag(real_name, value, origin);
943 }
944 }
945
946 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
947 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
948 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
949 if (real_name == NULL) {
950 return false;
951 }
952 return set_numeric_flag(real_name, value, origin);
953 }
954
955 return false;
956 }
957
958 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
959 assert(bldarray != NULL, "illegal argument");
960
961 if (arg == NULL) {
962 return;
963 }
964
965 int new_count = *count + 1;
966
967 // expand the array and add arg to the last element
968 if (*bldarray == NULL) {
969 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
970 } else {
971 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
972 }
973 (*bldarray)[*count] = os::strdup_check_oom(arg);
974 *count = new_count;
975 }
976
977 void Arguments::build_jvm_args(const char* arg) {
978 add_string(&_jvm_args_array, &_num_jvm_args, arg);
979 }
980
981 void Arguments::build_jvm_flags(const char* arg) {
982 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
983 }
984
985 // utility function to return a string that concatenates all
986 // strings in a given char** array
987 const char* Arguments::build_resource_string(char** args, int count) {
988 if (args == NULL || count == 0) {
989 return NULL;
990 }
991 size_t length = 0;
992 for (int i = 0; i < count; i++) {
993 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
994 }
995 char* s = NEW_RESOURCE_ARRAY(char, length);
996 char* dst = s;
997 for (int j = 0; j < count; j++) {
998 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
999 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1000 dst += offset;
1001 length -= offset;
1002 }
1003 return (const char*) s;
1004 }
1005
1006 void Arguments::print_on(outputStream* st) {
1007 st->print_cr("VM Arguments:");
1008 if (num_jvm_flags() > 0) {
1009 st->print("jvm_flags: "); print_jvm_flags_on(st);
1010 st->cr();
1011 }
1012 if (num_jvm_args() > 0) {
1013 st->print("jvm_args: "); print_jvm_args_on(st);
1014 st->cr();
1015 }
1016 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1017 if (_java_class_path != NULL) {
1018 char* path = _java_class_path->value();
1019 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1020 }
1021 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1022 }
1023
1024 void Arguments::print_summary_on(outputStream* st) {
1025 // Print the command line. Environment variables that are helpful for
1026 // reproducing the problem are written later in the hs_err file.
1027 // flags are from setting file
1028 if (num_jvm_flags() > 0) {
1029 st->print_raw("Settings File: ");
1030 print_jvm_flags_on(st);
1031 st->cr();
1032 }
1033 // args are the command line and environment variable arguments.
1034 st->print_raw("Command Line: ");
1035 if (num_jvm_args() > 0) {
1036 print_jvm_args_on(st);
1037 }
1038 // this is the classfile and any arguments to the java program
1039 if (java_command() != NULL) {
1040 st->print("%s", java_command());
1041 }
1042 st->cr();
1043 }
1044
1045 void Arguments::print_jvm_flags_on(outputStream* st) {
1046 if (_num_jvm_flags > 0) {
1047 for (int i=0; i < _num_jvm_flags; i++) {
1048 st->print("%s ", _jvm_flags_array[i]);
1049 }
1050 }
1051 }
1052
1053 void Arguments::print_jvm_args_on(outputStream* st) {
1054 if (_num_jvm_args > 0) {
1055 for (int i=0; i < _num_jvm_args; i++) {
1056 st->print("%s ", _jvm_args_array[i]);
1057 }
1058 }
1059 }
1060
1061 bool Arguments::process_argument(const char* arg,
1062 jboolean ignore_unrecognized,
1063 Flag::Flags origin) {
1064 JDK_Version since = JDK_Version();
1065
1066 if (parse_argument(arg, origin)) {
1067 return true;
1068 }
1069
1070 // Determine if the flag has '+', '-', or '=' characters.
1071 bool has_plus_minus = (*arg == '+' || *arg == '-');
1072 const char* const argname = has_plus_minus ? arg + 1 : arg;
1073
1074 size_t arg_len;
1075 const char* equal_sign = strchr(argname, '=');
1076 if (equal_sign == NULL) {
1077 arg_len = strlen(argname);
1078 } else {
1079 arg_len = equal_sign - argname;
1080 }
1081
1082 // Only make the obsolete check for valid arguments.
1083 if (arg_len <= BUFLEN) {
1084 // Construct a string which consists only of the argument name without '+', '-', or '='.
1085 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1086 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1087 if (is_obsolete_flag(stripped_argname, &since)) {
1088 char version[256];
1089 since.to_string(version, sizeof(version));
1090 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1091 return true;
1092 }
1093 #ifndef PRODUCT
1094 else {
1095 const char* replacement;
1096 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1097 log_warning(arguments)("%s has been removed. Please use %s instead.",
1098 stripped_argname,
1099 replacement);
1100 return false;
1101 }
1102 }
1103 #endif //PRODUCT
1104 }
1105
1106 // For locked flags, report a custom error message if available.
1107 // Otherwise, report the standard unrecognized VM option.
1108 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1109 if (found_flag != NULL) {
1110 char locked_message_buf[BUFLEN];
1111 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1112 if (strlen(locked_message_buf) == 0) {
1113 if (found_flag->is_bool() && !has_plus_minus) {
1114 jio_fprintf(defaultStream::error_stream(),
1115 "Missing +/- setting for VM option '%s'\n", argname);
1116 } else if (!found_flag->is_bool() && has_plus_minus) {
1117 jio_fprintf(defaultStream::error_stream(),
1118 "Unexpected +/- setting in VM option '%s'\n", argname);
1119 } else {
1120 jio_fprintf(defaultStream::error_stream(),
1121 "Improperly specified VM option '%s'\n", argname);
1122 }
1123 } else {
1124 #ifdef PRODUCT
1125 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1126 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1127 if (ignore_unrecognized && mismatched) {
1128 return true;
1129 }
1130 #endif
1131 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1132 }
1133 } else {
1134 if (ignore_unrecognized) {
1135 return true;
1136 }
1137 jio_fprintf(defaultStream::error_stream(),
1138 "Unrecognized VM option '%s'\n", argname);
1139 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1140 if (fuzzy_matched != NULL) {
1141 jio_fprintf(defaultStream::error_stream(),
1142 "Did you mean '%s%s%s'? ",
1143 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1144 fuzzy_matched->_name,
1145 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1146 }
1147 }
1148
1149 // allow for commandline "commenting out" options like -XX:#+Verbose
1150 return arg[0] == '#';
1151 }
1152
1153 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1154 FILE* stream = fopen(file_name, "rb");
1155 if (stream == NULL) {
1156 if (should_exist) {
1157 jio_fprintf(defaultStream::error_stream(),
1158 "Could not open settings file %s\n", file_name);
1159 return false;
1160 } else {
1161 return true;
1162 }
1163 }
1164
1165 char token[1024];
1166 int pos = 0;
1167
1168 bool in_white_space = true;
1169 bool in_comment = false;
1170 bool in_quote = false;
1171 char quote_c = 0;
1172 bool result = true;
1173
1174 int c = getc(stream);
1175 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1176 if (in_white_space) {
1177 if (in_comment) {
1178 if (c == '\n') in_comment = false;
1179 } else {
1180 if (c == '#') in_comment = true;
1181 else if (!isspace(c)) {
1182 in_white_space = false;
1183 token[pos++] = c;
1184 }
1185 }
1186 } else {
1187 if (c == '\n' || (!in_quote && isspace(c))) {
1188 // token ends at newline, or at unquoted whitespace
1189 // this allows a way to include spaces in string-valued options
1190 token[pos] = '\0';
1191 logOption(token);
1192 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1193 build_jvm_flags(token);
1194 pos = 0;
1195 in_white_space = true;
1196 in_quote = false;
1197 } else if (!in_quote && (c == '\'' || c == '"')) {
1198 in_quote = true;
1199 quote_c = c;
1200 } else if (in_quote && (c == quote_c)) {
1201 in_quote = false;
1202 } else {
1203 token[pos++] = c;
1204 }
1205 }
1206 c = getc(stream);
1207 }
1208 if (pos > 0) {
1209 token[pos] = '\0';
1210 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1211 build_jvm_flags(token);
1212 }
1213 fclose(stream);
1214 return result;
1215 }
1216
1217 //=============================================================================================================
1218 // Parsing of properties (-D)
1219
1220 const char* Arguments::get_property(const char* key) {
1221 return PropertyList_get_value(system_properties(), key);
1222 }
1223
1224 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1225 const char* eq = strchr(prop, '=');
1226 const char* key;
1227 const char* value = "";
1228
1229 if (eq == NULL) {
1230 // property doesn't have a value, thus use passed string
1231 key = prop;
1232 } else {
1233 // property have a value, thus extract it and save to the
1234 // allocated string
1235 size_t key_len = eq - prop;
1236 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1237
1238 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1239 key = tmp_key;
1240
1241 value = &prop[key_len + 1];
1242 }
1243
1244 if (strcmp(key, "java.compiler") == 0) {
1245 process_java_compiler_argument(value);
1246 // Record value in Arguments, but let it get passed to Java.
1247 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1248 strcmp(key, "sun.java.launcher.pid") == 0) {
1249 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1250 // private and are processed in process_sun_java_launcher_properties();
1251 // the sun.java.launcher property is passed on to the java application
1252 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1253 // append is true, writable is true, internal is false
1254 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1255 WriteableProperty, ExternalProperty);
1256 } else {
1257 if (strcmp(key, "sun.java.command") == 0) {
1258 char *old_java_command = _java_command;
1259 _java_command = os::strdup_check_oom(value, mtArguments);
1260 if (old_java_command != NULL) {
1261 os::free(old_java_command);
1262 }
1263 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1264 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1265 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1266 // its value without going through the property list or making a Java call.
1267 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1268 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1269 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1270 os::free((void *)old_java_vendor_url_bug);
1271 }
1272 }
1273
1274 // Create new property and add at the end of the list
1275 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1276 }
1277
1278 if (key != prop) {
1279 // SystemProperty copy passed value, thus free previously allocated
1280 // memory
1281 FreeHeap((void *)key);
1282 }
1283
1284 return true;
1285 }
1286
1287 #if INCLUDE_CDS
1288 void Arguments::check_unsupported_dumping_properties() {
1289 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1290 const char* unsupported_properties[] = { "jdk.module.main",
1291 "jdk.module.limitmods",
1292 "jdk.module.path",
1293 "jdk.module.upgrade.path",
1294 "jdk.module.addmods.0",
1295 "jdk.module.patch.0" };
1296 const char* unsupported_options[] = { "-m", // cannot use at dump time
1297 "--limit-modules", // ignored at dump time
1298 "--module-path", // ignored at dump time
1299 "--upgrade-module-path", // ignored at dump time
1300 "--add-modules", // ignored at dump time
1301 "--patch-module" // ignored at dump time
1302 };
1303 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1304 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1305 // vm will exit with an error message. Otherwise, it will print an informational message if
1306 // -Xlog:cds is enabled.
1307 uint info_idx = 1;
1308 SystemProperty* sp = system_properties();
1309 while (sp != NULL) {
1310 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1311 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1312 if (i < info_idx) {
1313 vm_exit_during_initialization(
1314 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1315 } else {
1316 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1317 unsupported_options[i]);
1318 }
1319 }
1320 }
1321 sp = sp->next();
1322 }
1323
1324 // Check for an exploded module build in use with -Xshare:dump.
1325 if (!has_jimage()) {
1326 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1327 }
1328 }
1329 #endif
1330
1331 //===========================================================================================================
1332 // Setting int/mixed/comp mode flags
1333
1334 void Arguments::set_mode_flags(Mode mode) {
1335 // Set up default values for all flags.
1336 // If you add a flag to any of the branches below,
1337 // add a default value for it here.
1338 set_java_compiler(false);
1339 _mode = mode;
1340
1341 // Ensure Agent_OnLoad has the correct initial values.
1342 // This may not be the final mode; mode may change later in onload phase.
1343 PropertyList_unique_add(&_system_properties, "java.vm.info",
1344 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1345
1346 UseInterpreter = true;
1347 UseCompiler = true;
1348 UseLoopCounter = true;
1349
1350 // Default values may be platform/compiler dependent -
1351 // use the saved values
1352 ClipInlining = Arguments::_ClipInlining;
1353 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1354 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1355 BackgroundCompilation = Arguments::_BackgroundCompilation;
1356 if (TieredCompilation) {
1357 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1358 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1359 }
1360 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1361 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1362 }
1363 }
1364
1365 // Change from defaults based on mode
1366 switch (mode) {
1367 default:
1368 ShouldNotReachHere();
1369 break;
1370 case _int:
1371 UseCompiler = false;
1372 UseLoopCounter = false;
1373 AlwaysCompileLoopMethods = false;
1374 UseOnStackReplacement = false;
1375 break;
1376 case _mixed:
1377 // same as default
1378 break;
1379 case _comp:
1380 UseInterpreter = false;
1381 BackgroundCompilation = false;
1382 ClipInlining = false;
1383 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1384 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1385 // compile a level 4 (C2) and then continue executing it.
1386 if (TieredCompilation) {
1387 Tier3InvokeNotifyFreqLog = 0;
1388 Tier4InvocationThreshold = 0;
1389 }
1390 break;
1391 }
1392 }
1393
1394 // Conflict: required to use shared spaces (-Xshare:on), but
1395 // incompatible command line options were chosen.
1396 static void no_shared_spaces(const char* message) {
1397 if (RequireSharedSpaces) {
1398 jio_fprintf(defaultStream::error_stream(),
1399 "Class data sharing is inconsistent with other specified options.\n");
1400 vm_exit_during_initialization("Unable to use shared archive.", message);
1401 } else {
1402 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1403 }
1404 }
1405
1406 // Returns threshold scaled with the value of scale.
1407 // If scale < 0.0, threshold is returned without scaling.
1408 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1409 if (scale == 1.0 || scale < 0.0) {
1410 return threshold;
1411 } else {
1412 return (intx)(threshold * scale);
1413 }
1414 }
1415
1416 // Returns freq_log scaled with the value of scale.
1417 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1418 // If scale < 0.0, freq_log is returned without scaling.
1419 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1420 // Check if scaling is necessary or if negative value was specified.
1421 if (scale == 1.0 || scale < 0.0) {
1422 return freq_log;
1423 }
1424 // Check values to avoid calculating log2 of 0.
1425 if (scale == 0.0 || freq_log == 0) {
1426 return 0;
1427 }
1428 // Determine the maximum notification frequency value currently supported.
1429 // The largest mask value that the interpreter/C1 can handle is
1430 // of length InvocationCounter::number_of_count_bits. Mask values are always
1431 // one bit shorter then the value of the notification frequency. Set
1432 // max_freq_bits accordingly.
1433 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1434 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1435 if (scaled_freq == 0) {
1436 // Return 0 right away to avoid calculating log2 of 0.
1437 return 0;
1438 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1439 return max_freq_bits;
1440 } else {
1441 return log2_intptr(scaled_freq);
1442 }
1443 }
1444
1445 void Arguments::set_tiered_flags() {
1446 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1447 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1448 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1449 }
1450 if (CompilationPolicyChoice < 2) {
1451 vm_exit_during_initialization(
1452 "Incompatible compilation policy selected", NULL);
1453 }
1454 // Increase the code cache size - tiered compiles a lot more.
1455 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1456 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1457 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1458 }
1459 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1460 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1461 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1462 }
1463 if (!UseInterpreter) { // -Xcomp
1464 Tier3InvokeNotifyFreqLog = 0;
1465 Tier4InvocationThreshold = 0;
1466 }
1467
1468 if (CompileThresholdScaling < 0) {
1469 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1470 }
1471
1472 // Scale tiered compilation thresholds.
1473 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1474 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1475 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1476 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1477
1478 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1479 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1480 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1481 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1482
1483 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1484 // once these thresholds become supported.
1485
1486 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1487 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1488
1489 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1490 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1491
1492 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1493
1494 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1495 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1496 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1497 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1498 }
1499 }
1500
1501 #if INCLUDE_ALL_GCS
1502 static void disable_adaptive_size_policy(const char* collector_name) {
1503 if (UseAdaptiveSizePolicy) {
1504 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1505 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1506 collector_name);
1507 }
1508 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1509 }
1510 }
1511
1512 void Arguments::set_parnew_gc_flags() {
1513 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1514 "control point invariant");
1515 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1516
1517 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1518 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1519 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1520 } else if (ParallelGCThreads == 0) {
1521 jio_fprintf(defaultStream::error_stream(),
1522 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1523 vm_exit(1);
1524 }
1525
1526 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1527 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1528 // we set them to 1024 and 1024.
1529 // See CR 6362902.
1530 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1531 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1532 }
1533 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1534 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1535 }
1536
1537 // When using compressed oops, we use local overflow stacks,
1538 // rather than using a global overflow list chained through
1539 // the klass word of the object's pre-image.
1540 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1541 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1542 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1543 }
1544 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1545 }
1546 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1547 }
1548
1549 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1550 // sparc/solaris for certain applications, but would gain from
1551 // further optimization and tuning efforts, and would almost
1552 // certainly gain from analysis of platform and environment.
1553 void Arguments::set_cms_and_parnew_gc_flags() {
1554 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1555 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1556
1557 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1558 disable_adaptive_size_policy("UseConcMarkSweepGC");
1559
1560 set_parnew_gc_flags();
1561
1562 size_t max_heap = align_down(MaxHeapSize,
1563 CardTableRS::ct_max_alignment_constraint());
1564
1565 // Now make adjustments for CMS
1566 intx tenuring_default = (intx)6;
1567 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1568
1569 // Preferred young gen size for "short" pauses:
1570 // upper bound depends on # of threads and NewRatio.
1571 const size_t preferred_max_new_size_unaligned =
1572 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1573 size_t preferred_max_new_size =
1574 align_up(preferred_max_new_size_unaligned, os::vm_page_size());
1575
1576 // Unless explicitly requested otherwise, size young gen
1577 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1578
1579 // If either MaxNewSize or NewRatio is set on the command line,
1580 // assume the user is trying to set the size of the young gen.
1581 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1582
1583 // Set MaxNewSize to our calculated preferred_max_new_size unless
1584 // NewSize was set on the command line and it is larger than
1585 // preferred_max_new_size.
1586 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1587 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1588 } else {
1589 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1590 }
1591 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1592
1593 // Code along this path potentially sets NewSize and OldSize
1594 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1595 min_heap_size(), InitialHeapSize, max_heap);
1596 size_t min_new = preferred_max_new_size;
1597 if (FLAG_IS_CMDLINE(NewSize)) {
1598 min_new = NewSize;
1599 }
1600 if (max_heap > min_new && min_heap_size() > min_new) {
1601 // Unless explicitly requested otherwise, make young gen
1602 // at least min_new, and at most preferred_max_new_size.
1603 if (FLAG_IS_DEFAULT(NewSize)) {
1604 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1605 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1606 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1607 }
1608 // Unless explicitly requested otherwise, size old gen
1609 // so it's NewRatio x of NewSize.
1610 if (FLAG_IS_DEFAULT(OldSize)) {
1611 if (max_heap > NewSize) {
1612 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1613 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1614 }
1615 }
1616 }
1617 }
1618 // Unless explicitly requested otherwise, definitely
1619 // promote all objects surviving "tenuring_default" scavenges.
1620 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1621 FLAG_IS_DEFAULT(SurvivorRatio)) {
1622 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1623 }
1624 // If we decided above (or user explicitly requested)
1625 // `promote all' (via MaxTenuringThreshold := 0),
1626 // prefer minuscule survivor spaces so as not to waste
1627 // space for (non-existent) survivors
1628 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1629 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1630 }
1631
1632 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1633 // but rather the number of free blocks of a given size that are used when
1634 // replenishing the local per-worker free list caches.
1635 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1636 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1637 // OldPLAB sizing manually turned off: Use a larger default setting,
1638 // unless it was manually specified. This is because a too-low value
1639 // will slow down scavenges.
1640 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1641 } else {
1642 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1643 }
1644 }
1645
1646 // If either of the static initialization defaults have changed, note this
1647 // modification.
1648 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1649 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1650 }
1651
1652 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1653 }
1654 #endif // INCLUDE_ALL_GCS
1655
1656 void set_object_alignment() {
1657 // Object alignment.
1658 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1659 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1660 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1661 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1662 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1663 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1664
1665 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1666 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1667
1668 // Oop encoding heap max
1669 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1670
1671 if (SurvivorAlignmentInBytes == 0) {
1672 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1673 }
1674
1675 #if INCLUDE_ALL_GCS
1676 // Set CMS global values
1677 CompactibleFreeListSpace::set_cms_values();
1678 #endif // INCLUDE_ALL_GCS
1679 }
1680
1681 size_t Arguments::max_heap_for_compressed_oops() {
1682 // Avoid sign flip.
1683 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1684 // We need to fit both the NULL page and the heap into the memory budget, while
1685 // keeping alignment constraints of the heap. To guarantee the latter, as the
1686 // NULL page is located before the heap, we pad the NULL page to the conservative
1687 // maximum alignment that the GC may ever impose upon the heap.
1688 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1689 _conservative_max_heap_alignment);
1690
1691 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1692 NOT_LP64(ShouldNotReachHere(); return 0);
1693 }
1694
1695 void Arguments::set_use_compressed_oops() {
1696 #ifndef ZERO
1697 #ifdef _LP64
1698 // MaxHeapSize is not set up properly at this point, but
1699 // the only value that can override MaxHeapSize if we are
1700 // to use UseCompressedOops is InitialHeapSize.
1701 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1702
1703 if (max_heap_size <= max_heap_for_compressed_oops()) {
1704 #if !defined(COMPILER1) || defined(TIERED)
1705 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1706 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1707 }
1708 #endif
1709 } else {
1710 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1711 warning("Max heap size too large for Compressed Oops");
1712 FLAG_SET_DEFAULT(UseCompressedOops, false);
1713 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1714 }
1715 }
1716 #endif // _LP64
1717 #endif // ZERO
1718 }
1719
1720
1721 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1722 // set_use_compressed_oops().
1723 void Arguments::set_use_compressed_klass_ptrs() {
1724 #ifndef ZERO
1725 #ifdef _LP64
1726 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1727 if (!UseCompressedOops) {
1728 if (UseCompressedClassPointers) {
1729 warning("UseCompressedClassPointers requires UseCompressedOops");
1730 }
1731 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1732 } else {
1733 // Turn on UseCompressedClassPointers too
1734 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1735 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1736 }
1737 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1738 if (UseCompressedClassPointers) {
1739 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1740 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1741 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1742 }
1743 }
1744 }
1745 #endif // _LP64
1746 #endif // !ZERO
1747 }
1748
1749 void Arguments::set_conservative_max_heap_alignment() {
1750 // The conservative maximum required alignment for the heap is the maximum of
1751 // the alignments imposed by several sources: any requirements from the heap
1752 // itself, the collector policy and the maximum page size we may run the VM
1753 // with.
1754 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1755 #if INCLUDE_ALL_GCS
1756 if (UseParallelGC) {
1757 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1758 } else if (UseG1GC) {
1759 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1760 }
1761 #endif // INCLUDE_ALL_GCS
1762 _conservative_max_heap_alignment = MAX4(heap_alignment,
1763 (size_t)os::vm_allocation_granularity(),
1764 os::max_page_size(),
1765 CollectorPolicy::compute_heap_alignment());
1766 }
1767
1768 bool Arguments::gc_selected() {
1769 #if INCLUDE_ALL_GCS
1770 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1771 #else
1772 return UseSerialGC;
1773 #endif // INCLUDE_ALL_GCS
1774 }
1775
1776 #ifdef TIERED
1777 bool Arguments::compilation_mode_selected() {
1778 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1779 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1780
1781 }
1782
1783 void Arguments::select_compilation_mode_ergonomically() {
1784 #if defined(_WINDOWS) && !defined(_LP64)
1785 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1786 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1787 }
1788 #endif
1789 if (NeverActAsServerClassMachine) {
1790 set_client_compilation_mode();
1791 }
1792 }
1793 #endif //TIERED
1794
1795 void Arguments::select_gc_ergonomically() {
1796 #if INCLUDE_ALL_GCS
1797 if (os::is_server_class_machine()) {
1798 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1799 } else {
1800 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1801 }
1802 #else
1803 UNSUPPORTED_OPTION(UseG1GC);
1804 UNSUPPORTED_OPTION(UseParallelGC);
1805 UNSUPPORTED_OPTION(UseParallelOldGC);
1806 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1807 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1808 #endif // INCLUDE_ALL_GCS
1809 }
1810
1811 void Arguments::select_gc() {
1812 if (!gc_selected()) {
1813 select_gc_ergonomically();
1814 if (!gc_selected()) {
1815 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1816 }
1817 }
1818 }
1819
1820 #if INCLUDE_JVMCI
1821 void Arguments::set_jvmci_specific_flags() {
1822 if (UseJVMCICompiler) {
1823 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1824 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1825 }
1826 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1827 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1828 }
1829 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1830 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1831 }
1832 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1833 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1834 }
1835 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1836 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1837 }
1838 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1839 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1840 }
1841 if (TieredStopAtLevel != CompLevel_full_optimization) {
1842 // Currently JVMCI compiler can only work at the full optimization level
1843 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1844 TieredStopAtLevel = CompLevel_full_optimization;
1845 }
1846 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1847 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1848 }
1849 }
1850 }
1851 #endif
1852
1853 void Arguments::set_ergonomics_flags() {
1854 #ifdef TIERED
1855 if (!compilation_mode_selected()) {
1856 select_compilation_mode_ergonomically();
1857 }
1858 #endif
1859 select_gc();
1860
1861 #if defined(COMPILER2) || INCLUDE_JVMCI
1862 // Shared spaces work fine with other GCs but causes bytecode rewriting
1863 // to be disabled, which hurts interpreter performance and decreases
1864 // server performance. When -server is specified, keep the default off
1865 // unless it is asked for. Future work: either add bytecode rewriting
1866 // at link time, or rewrite bytecodes in non-shared methods.
1867 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1868 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1869 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1870 }
1871 #endif
1872
1873 set_conservative_max_heap_alignment();
1874
1875 #ifndef ZERO
1876 #ifdef _LP64
1877 set_use_compressed_oops();
1878
1879 // set_use_compressed_klass_ptrs() must be called after calling
1880 // set_use_compressed_oops().
1881 set_use_compressed_klass_ptrs();
1882
1883 // Also checks that certain machines are slower with compressed oops
1884 // in vm_version initialization code.
1885 #endif // _LP64
1886 #endif // !ZERO
1887
1888 }
1889
1890 void Arguments::set_parallel_gc_flags() {
1891 assert(UseParallelGC || UseParallelOldGC, "Error");
1892 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1893 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1894 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1895 }
1896 FLAG_SET_DEFAULT(UseParallelGC, true);
1897
1898 // If no heap maximum was requested explicitly, use some reasonable fraction
1899 // of the physical memory, up to a maximum of 1GB.
1900 FLAG_SET_DEFAULT(ParallelGCThreads,
1901 Abstract_VM_Version::parallel_worker_threads());
1902 if (ParallelGCThreads == 0) {
1903 jio_fprintf(defaultStream::error_stream(),
1904 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1905 vm_exit(1);
1906 }
1907
1908 if (UseAdaptiveSizePolicy) {
1909 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1910 // unless the user actually sets these flags.
1911 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1912 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1913 }
1914 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1915 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1916 }
1917 }
1918
1919 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1920 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1921 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1922 // See CR 6362902 for details.
1923 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1924 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1925 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1926 }
1927 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1928 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1929 }
1930 }
1931
1932 if (UseParallelOldGC) {
1933 // Par compact uses lower default values since they are treated as
1934 // minimums. These are different defaults because of the different
1935 // interpretation and are not ergonomically set.
1936 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1937 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1938 }
1939 }
1940 }
1941
1942 void Arguments::set_g1_gc_flags() {
1943 assert(UseG1GC, "Error");
1944 #if defined(COMPILER1) || INCLUDE_JVMCI
1945 FastTLABRefill = false;
1946 #endif
1947 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1948 if (ParallelGCThreads == 0) {
1949 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1950 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1951 }
1952
1953 #if INCLUDE_ALL_GCS
1954 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1955 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1956 }
1957 #endif
1958
1959 // MarkStackSize will be set (if it hasn't been set by the user)
1960 // when concurrent marking is initialized.
1961 // Its value will be based upon the number of parallel marking threads.
1962 // But we do set the maximum mark stack size here.
1963 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1964 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1965 }
1966
1967 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1968 // In G1, we want the default GC overhead goal to be higher than
1969 // it is for PS, or the heap might be expanded too aggressively.
1970 // We set it here to ~8%.
1971 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1972 }
1973
1974 // Below, we might need to calculate the pause time interval based on
1975 // the pause target. When we do so we are going to give G1 maximum
1976 // flexibility and allow it to do pauses when it needs to. So, we'll
1977 // arrange that the pause interval to be pause time target + 1 to
1978 // ensure that a) the pause time target is maximized with respect to
1979 // the pause interval and b) we maintain the invariant that pause
1980 // time target < pause interval. If the user does not want this
1981 // maximum flexibility, they will have to set the pause interval
1982 // explicitly.
1983
1984 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1985 // The default pause time target in G1 is 200ms
1986 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1987 }
1988
1989 // Then, if the interval parameter was not set, set it according to
1990 // the pause time target (this will also deal with the case when the
1991 // pause time target is the default value).
1992 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1993 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1994 }
1995
1996 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1997 }
1998
1999 void Arguments::set_gc_specific_flags() {
2000 #if INCLUDE_ALL_GCS
2001 // Set per-collector flags
2002 if (UseParallelGC || UseParallelOldGC) {
2003 set_parallel_gc_flags();
2004 } else if (UseConcMarkSweepGC) {
2005 set_cms_and_parnew_gc_flags();
2006 } else if (UseG1GC) {
2007 set_g1_gc_flags();
2008 }
2009 if (AssumeMP && !UseSerialGC) {
2010 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2011 warning("If the number of processors is expected to increase from one, then"
2012 " you should configure the number of parallel GC threads appropriately"
2013 " using -XX:ParallelGCThreads=N");
2014 }
2015 }
2016 if (MinHeapFreeRatio == 100) {
2017 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2018 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2019 }
2020
2021 // If class unloading is disabled, also disable concurrent class unloading.
2022 if (!ClassUnloading) {
2023 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2024 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2025 }
2026 #endif // INCLUDE_ALL_GCS
2027 }
2028
2029 julong Arguments::limit_by_allocatable_memory(julong limit) {
2030 julong max_allocatable;
2031 julong result = limit;
2032 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2033 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2034 }
2035 return result;
2036 }
2037
2038 // Use static initialization to get the default before parsing
2039 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2040
2041 void Arguments::set_heap_size() {
2042 julong phys_mem =
2043 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2044 : (julong)MaxRAM;
2045
2046 // Experimental support for CGroup memory limits
2047 if (UseCGroupMemoryLimitForHeap) {
2048 // This is a rough indicator that a CGroup limit may be in force
2049 // for this process
2050 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
2051 FILE *fp = fopen(lim_file, "r");
2052 if (fp != NULL) {
2053 julong cgroup_max = 0;
2054 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2055 if (ret == 1 && cgroup_max > 0) {
2056 // If unlimited, cgroup_max will be a very large, but unspecified
2057 // value, so use initial phys_mem as a limit
2058 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
2059 JULONG_FORMAT "MB) and initial phys_mem ("
2060 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2061 phys_mem = MIN2(cgroup_max, phys_mem);
2062 } else {
2063 warning("Unable to read/parse cgroup memory limit from %s: %s",
2064 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2065 }
2066 fclose(fp);
2067 } else {
2068 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2069 }
2070 }
2071
2072 // If the maximum heap size has not been set with -Xmx,
2073 // then set it as fraction of the size of physical memory,
2074 // respecting the maximum and minimum sizes of the heap.
2075 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2076 julong reasonable_max = phys_mem / MaxRAMFraction;
2077
2078 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2079 // Small physical memory, so use a minimum fraction of it for the heap
2080 reasonable_max = phys_mem / MinRAMFraction;
2081 } else {
2082 // Not-small physical memory, so require a heap at least
2083 // as large as MaxHeapSize
2084 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2085 }
2086 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2087 // Limit the heap size to ErgoHeapSizeLimit
2088 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2089 }
2090 if (UseCompressedOops) {
2091 // Limit the heap size to the maximum possible when using compressed oops
2092 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2093
2094 // HeapBaseMinAddress can be greater than default but not less than.
2095 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2096 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2097 // matches compressed oops printing flags
2098 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2099 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2100 DefaultHeapBaseMinAddress,
2101 DefaultHeapBaseMinAddress/G,
2102 HeapBaseMinAddress);
2103 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2104 }
2105 }
2106
2107 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2108 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2109 // but it should be not less than default MaxHeapSize.
2110 max_coop_heap -= HeapBaseMinAddress;
2111 }
2112 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2113 }
2114 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2115
2116 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2117 // An initial heap size was specified on the command line,
2118 // so be sure that the maximum size is consistent. Done
2119 // after call to limit_by_allocatable_memory because that
2120 // method might reduce the allocation size.
2121 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2122 }
2123
2124 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2125 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2126 }
2127
2128 // If the minimum or initial heap_size have not been set or requested to be set
2129 // ergonomically, set them accordingly.
2130 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2131 julong reasonable_minimum = (julong)(OldSize + NewSize);
2132
2133 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2134
2135 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2136
2137 if (InitialHeapSize == 0) {
2138 julong reasonable_initial = phys_mem / InitialRAMFraction;
2139
2140 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2141 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2142
2143 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2144
2145 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2146 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2147 }
2148 // If the minimum heap size has not been set (via -Xms),
2149 // synchronize with InitialHeapSize to avoid errors with the default value.
2150 if (min_heap_size() == 0) {
2151 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2152 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2153 }
2154 }
2155 }
2156
2157 // This option inspects the machine and attempts to set various
2158 // parameters to be optimal for long-running, memory allocation
2159 // intensive jobs. It is intended for machines with large
2160 // amounts of cpu and memory.
2161 jint Arguments::set_aggressive_heap_flags() {
2162 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2163 // VM, but we may not be able to represent the total physical memory
2164 // available (like having 8gb of memory on a box but using a 32bit VM).
2165 // Thus, we need to make sure we're using a julong for intermediate
2166 // calculations.
2167 julong initHeapSize;
2168 julong total_memory = os::physical_memory();
2169
2170 if (total_memory < (julong) 256 * M) {
2171 jio_fprintf(defaultStream::error_stream(),
2172 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2173 vm_exit(1);
2174 }
2175
2176 // The heap size is half of available memory, or (at most)
2177 // all of possible memory less 160mb (leaving room for the OS
2178 // when using ISM). This is the maximum; because adaptive sizing
2179 // is turned on below, the actual space used may be smaller.
2180
2181 initHeapSize = MIN2(total_memory / (julong) 2,
2182 total_memory - (julong) 160 * M);
2183
2184 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2185
2186 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2187 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2188 return JNI_EINVAL;
2189 }
2190 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2191 return JNI_EINVAL;
2192 }
2193 // Currently the minimum size and the initial heap sizes are the same.
2194 set_min_heap_size(initHeapSize);
2195 }
2196 if (FLAG_IS_DEFAULT(NewSize)) {
2197 // Make the young generation 3/8ths of the total heap.
2198 if (FLAG_SET_CMDLINE(size_t, NewSize,
2199 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2200 return JNI_EINVAL;
2201 }
2202 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2203 return JNI_EINVAL;
2204 }
2205 }
2206
2207 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2208 FLAG_SET_DEFAULT(UseLargePages, true);
2209 #endif
2210
2211 // Increase some data structure sizes for efficiency
2212 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2213 return JNI_EINVAL;
2214 }
2215 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2216 return JNI_EINVAL;
2217 }
2218 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2219 return JNI_EINVAL;
2220 }
2221
2222 // See the OldPLABSize comment below, but replace 'after promotion'
2223 // with 'after copying'. YoungPLABSize is the size of the survivor
2224 // space per-gc-thread buffers. The default is 4kw.
2225 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2226 return JNI_EINVAL;
2227 }
2228
2229 // OldPLABSize is the size of the buffers in the old gen that
2230 // UseParallelGC uses to promote live data that doesn't fit in the
2231 // survivor spaces. At any given time, there's one for each gc thread.
2232 // The default size is 1kw. These buffers are rarely used, since the
2233 // survivor spaces are usually big enough. For specjbb, however, there
2234 // are occasions when there's lots of live data in the young gen
2235 // and we end up promoting some of it. We don't have a definite
2236 // explanation for why bumping OldPLABSize helps, but the theory
2237 // is that a bigger PLAB results in retaining something like the
2238 // original allocation order after promotion, which improves mutator
2239 // locality. A minor effect may be that larger PLABs reduce the
2240 // number of PLAB allocation events during gc. The value of 8kw
2241 // was arrived at by experimenting with specjbb.
2242 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2243 return JNI_EINVAL;
2244 }
2245
2246 // Enable parallel GC and adaptive generation sizing
2247 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2248 return JNI_EINVAL;
2249 }
2250
2251 // Encourage steady state memory management
2252 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2253 return JNI_EINVAL;
2254 }
2255
2256 // This appears to improve mutator locality
2257 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2258 return JNI_EINVAL;
2259 }
2260
2261 // Get around early Solaris scheduling bug
2262 // (affinity vs other jobs on system)
2263 // but disallow DR and offlining (5008695).
2264 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2265 return JNI_EINVAL;
2266 }
2267
2268 return JNI_OK;
2269 }
2270
2271 // This must be called after ergonomics.
2272 void Arguments::set_bytecode_flags() {
2273 if (!RewriteBytecodes) {
2274 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2275 }
2276 }
2277
2278 // Aggressive optimization flags -XX:+AggressiveOpts
2279 jint Arguments::set_aggressive_opts_flags() {
2280 #ifdef COMPILER2
2281 if (AggressiveUnboxing) {
2282 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2283 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2284 } else if (!EliminateAutoBox) {
2285 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2286 AggressiveUnboxing = false;
2287 }
2288 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2289 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2290 } else if (!DoEscapeAnalysis) {
2291 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2292 AggressiveUnboxing = false;
2293 }
2294 }
2295 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2296 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2297 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2298 }
2299 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2300 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2301 }
2302
2303 // Feed the cache size setting into the JDK
2304 char buffer[1024];
2305 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2306 if (!add_property(buffer)) {
2307 return JNI_ENOMEM;
2308 }
2309 }
2310 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2311 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2312 }
2313 #endif
2314
2315 if (AggressiveOpts) {
2316 // Sample flag setting code
2317 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2318 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2319 // }
2320 }
2321
2322 return JNI_OK;
2323 }
2324
2325 //===========================================================================================================
2326 // Parsing of java.compiler property
2327
2328 void Arguments::process_java_compiler_argument(const char* arg) {
2329 // For backwards compatibility, Djava.compiler=NONE or ""
2330 // causes us to switch to -Xint mode UNLESS -Xdebug
2331 // is also specified.
2332 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2333 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2334 }
2335 }
2336
2337 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2338 _sun_java_launcher = os::strdup_check_oom(launcher);
2339 }
2340
2341 bool Arguments::created_by_java_launcher() {
2342 assert(_sun_java_launcher != NULL, "property must have value");
2343 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2344 }
2345
2346 bool Arguments::sun_java_launcher_is_altjvm() {
2347 return _sun_java_launcher_is_altjvm;
2348 }
2349
2350 //===========================================================================================================
2351 // Parsing of main arguments
2352
2353 #if INCLUDE_JVMCI
2354 // Check consistency of jvmci vm argument settings.
2355 bool Arguments::check_jvmci_args_consistency() {
2356 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2357 }
2358 #endif //INCLUDE_JVMCI
2359
2360 // Check consistency of GC selection
2361 bool Arguments::check_gc_consistency() {
2362 // Ensure that the user has not selected conflicting sets
2363 // of collectors.
2364 uint i = 0;
2365 if (UseSerialGC) i++;
2366 if (UseConcMarkSweepGC) i++;
2367 if (UseParallelGC || UseParallelOldGC) i++;
2368 if (UseG1GC) i++;
2369 if (i > 1) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "Conflicting collector combinations in option list; "
2372 "please refer to the release notes for the combinations "
2373 "allowed\n");
2374 return false;
2375 }
2376
2377 return true;
2378 }
2379
2380 // Check the consistency of vm_init_args
2381 bool Arguments::check_vm_args_consistency() {
2382 // Method for adding checks for flag consistency.
2383 // The intent is to warn the user of all possible conflicts,
2384 // before returning an error.
2385 // Note: Needs platform-dependent factoring.
2386 bool status = true;
2387
2388 if (TLABRefillWasteFraction == 0) {
2389 jio_fprintf(defaultStream::error_stream(),
2390 "TLABRefillWasteFraction should be a denominator, "
2391 "not " SIZE_FORMAT "\n",
2392 TLABRefillWasteFraction);
2393 status = false;
2394 }
2395
2396 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2397 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2398 }
2399
2400 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2401 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2402 }
2403
2404 if (GCTimeLimit == 100) {
2405 // Turn off gc-overhead-limit-exceeded checks
2406 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2407 }
2408
2409 status = status && check_gc_consistency();
2410
2411 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2412 // insists that we hold the requisite locks so that the iteration is
2413 // MT-safe. For the verification at start-up and shut-down, we don't
2414 // yet have a good way of acquiring and releasing these locks,
2415 // which are not visible at the CollectedHeap level. We want to
2416 // be able to acquire these locks and then do the iteration rather
2417 // than just disable the lock verification. This will be fixed under
2418 // bug 4788986.
2419 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2420 if (VerifyDuringStartup) {
2421 warning("Heap verification at start-up disabled "
2422 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2423 VerifyDuringStartup = false; // Disable verification at start-up
2424 }
2425
2426 if (VerifyBeforeExit) {
2427 warning("Heap verification at shutdown disabled "
2428 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2429 VerifyBeforeExit = false; // Disable verification at shutdown
2430 }
2431 }
2432
2433 if (PrintNMTStatistics) {
2434 #if INCLUDE_NMT
2435 if (MemTracker::tracking_level() == NMT_off) {
2436 #endif // INCLUDE_NMT
2437 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2438 PrintNMTStatistics = false;
2439 #if INCLUDE_NMT
2440 }
2441 #endif
2442 }
2443
2444 #if INCLUDE_JVMCI
2445 status = status && check_jvmci_args_consistency();
2446
2447 if (EnableJVMCI) {
2448 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2449 AddProperty, UnwriteableProperty, InternalProperty);
2450
2451 if (!ScavengeRootsInCode) {
2452 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2453 ScavengeRootsInCode = 1;
2454 }
2455 }
2456 #endif
2457
2458 // Check lower bounds of the code cache
2459 // Template Interpreter code is approximately 3X larger in debug builds.
2460 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2461 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2462 jio_fprintf(defaultStream::error_stream(),
2463 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2464 os::vm_page_size()/K);
2465 status = false;
2466 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2467 jio_fprintf(defaultStream::error_stream(),
2468 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2469 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2470 status = false;
2471 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2474 min_code_cache_size/K);
2475 status = false;
2476 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2477 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2478 jio_fprintf(defaultStream::error_stream(),
2479 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2480 CODE_CACHE_SIZE_LIMIT/M);
2481 status = false;
2482 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2485 min_code_cache_size/K);
2486 status = false;
2487 }
2488
2489 #ifdef _LP64
2490 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2491 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2492 }
2493 #endif
2494
2495 #ifndef SUPPORT_RESERVED_STACK_AREA
2496 if (StackReservedPages != 0) {
2497 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2498 warning("Reserved Stack Area not supported on this platform");
2499 }
2500 #endif
2501
2502 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2503 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2504 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2505 }
2506 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2507 }
2508 if (UseCompiler && is_interpreter_only()) {
2509 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2510 warning("UseCompiler disabled due to -Xint.");
2511 }
2512 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2513 }
2514 #ifdef COMPILER2
2515 if (PostLoopMultiversioning && !RangeCheckElimination) {
2516 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2517 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2518 }
2519 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2520 }
2521 #endif
2522
2523 if (LP64_ONLY(false &&) !FLAG_IS_DEFAULT(ValueTypePassFieldsAsArgs)) {
2524 FLAG_SET_CMDLINE(bool, ValueTypePassFieldsAsArgs, false);
2525 warning("ValueTypePassFieldsAsArgs is not supported on this platform");
2526 }
2527
2528 if (LP64_ONLY(false &&) !FLAG_IS_DEFAULT(ValueTypeReturnedAsFields)) {
2529 FLAG_SET_CMDLINE(bool, ValueTypeReturnedAsFields, false);
2530 warning("ValueTypeReturnedAsFields is not supported on this platform");
2531 }
2532
2533 if (FLAG_IS_DEFAULT(TieredCompilation)) {
2534 // C1 has no support for value types
2535 TieredCompilation = false;
2536 }
2537
2538 if(EnableMVT && EnableValhalla) {
2539 jio_fprintf(defaultStream::error_stream(),
2540 "Conflicting combination in option list: EnableMVT and EnableValhalla cannot be both enabled at the same time");
2541 }
2542
2543 return status;
2544 }
2545
2546 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2547 const char* option_type) {
2548 if (ignore) return false;
2549
2550 const char* spacer = " ";
2551 if (option_type == NULL) {
2552 option_type = ++spacer; // Set both to the empty string.
2553 }
2554
2555 if (os::obsolete_option(option)) {
2556 jio_fprintf(defaultStream::error_stream(),
2557 "Obsolete %s%soption: %s\n", option_type, spacer,
2558 option->optionString);
2559 return false;
2560 } else {
2561 jio_fprintf(defaultStream::error_stream(),
2562 "Unrecognized %s%soption: %s\n", option_type, spacer,
2563 option->optionString);
2564 return true;
2565 }
2566 }
2567
2568 static const char* user_assertion_options[] = {
2569 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2570 };
2571
2572 static const char* system_assertion_options[] = {
2573 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2574 };
2575
2576 bool Arguments::parse_uintx(const char* value,
2577 uintx* uintx_arg,
2578 uintx min_size) {
2579
2580 // Check the sign first since atojulong() parses only unsigned values.
2581 bool value_is_positive = !(*value == '-');
2582
2583 if (value_is_positive) {
2584 julong n;
2585 bool good_return = atojulong(value, &n);
2586 if (good_return) {
2587 bool above_minimum = n >= min_size;
2588 bool value_is_too_large = n > max_uintx;
2589
2590 if (above_minimum && !value_is_too_large) {
2591 *uintx_arg = n;
2592 return true;
2593 }
2594 }
2595 }
2596 return false;
2597 }
2598
2599 unsigned int addreads_count = 0;
2600 unsigned int addexports_count = 0;
2601 unsigned int addopens_count = 0;
2602 unsigned int addmods_count = 0;
2603 unsigned int patch_mod_count = 0;
2604
2605 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2606 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2607 char* property = AllocateHeap(prop_len, mtArguments);
2608 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2609 if (ret < 0 || ret >= (int)prop_len) {
2610 FreeHeap(property);
2611 return false;
2612 }
2613 bool added = add_property(property, UnwriteableProperty, internal);
2614 FreeHeap(property);
2615 return added;
2616 }
2617
2618 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2619 const unsigned int props_count_limit = 1000;
2620 const int max_digits = 3;
2621 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2622
2623 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2624 if (count < props_count_limit) {
2625 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2626 char* property = AllocateHeap(prop_len, mtArguments);
2627 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2628 if (ret < 0 || ret >= (int)prop_len) {
2629 FreeHeap(property);
2630 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2631 return false;
2632 }
2633 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2634 FreeHeap(property);
2635 return added;
2636 }
2637
2638 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2639 return false;
2640 }
2641
2642 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2643 julong* long_arg,
2644 julong min_size,
2645 julong max_size) {
2646 if (!atojulong(s, long_arg)) return arg_unreadable;
2647 return check_memory_size(*long_arg, min_size, max_size);
2648 }
2649
2650 // Parse JavaVMInitArgs structure
2651
2652 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2653 const JavaVMInitArgs *java_options_args,
2654 const JavaVMInitArgs *cmd_line_args) {
2655 bool patch_mod_javabase = false;
2656
2657 // Save default settings for some mode flags
2658 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2659 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2660 Arguments::_ClipInlining = ClipInlining;
2661 Arguments::_BackgroundCompilation = BackgroundCompilation;
2662 if (TieredCompilation) {
2663 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2664 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2665 }
2666
2667 // Setup flags for mixed which is the default
2668 set_mode_flags(_mixed);
2669
2670 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2671 // variable (if present).
2672 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2673 if (result != JNI_OK) {
2674 return result;
2675 }
2676
2677 // Parse args structure generated from the command line flags.
2678 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2679 if (result != JNI_OK) {
2680 return result;
2681 }
2682
2683 // Parse args structure generated from the _JAVA_OPTIONS environment
2684 // variable (if present) (mimics classic VM)
2685 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2686 if (result != JNI_OK) {
2687 return result;
2688 }
2689
2690 // Do final processing now that all arguments have been parsed
2691 result = finalize_vm_init_args();
2692 if (result != JNI_OK) {
2693 return result;
2694 }
2695
2696 #if INCLUDE_CDS
2697 if (UseSharedSpaces && patch_mod_javabase) {
2698 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2699 }
2700 #endif
2701
2702 return JNI_OK;
2703 }
2704
2705 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2706 // represents a valid JDWP agent. is_path==true denotes that we
2707 // are dealing with -agentpath (case where name is a path), otherwise with
2708 // -agentlib
2709 bool valid_jdwp_agent(char *name, bool is_path) {
2710 char *_name;
2711 const char *_jdwp = "jdwp";
2712 size_t _len_jdwp, _len_prefix;
2713
2714 if (is_path) {
2715 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2716 return false;
2717 }
2718
2719 _name++; // skip past last path separator
2720 _len_prefix = strlen(JNI_LIB_PREFIX);
2721
2722 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2723 return false;
2724 }
2725
2726 _name += _len_prefix;
2727 _len_jdwp = strlen(_jdwp);
2728
2729 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2730 _name += _len_jdwp;
2731 }
2732 else {
2733 return false;
2734 }
2735
2736 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2737 return false;
2738 }
2739
2740 return true;
2741 }
2742
2743 if (strcmp(name, _jdwp) == 0) {
2744 return true;
2745 }
2746
2747 return false;
2748 }
2749
2750 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2751 // --patch-module=<module>=<file>(<pathsep><file>)*
2752 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2753 // Find the equal sign between the module name and the path specification
2754 const char* module_equal = strchr(patch_mod_tail, '=');
2755 if (module_equal == NULL) {
2756 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2757 return JNI_ERR;
2758 } else {
2759 // Pick out the module name
2760 size_t module_len = module_equal - patch_mod_tail;
2761 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2762 if (module_name != NULL) {
2763 memcpy(module_name, patch_mod_tail, module_len);
2764 *(module_name + module_len) = '\0';
2765 // The path piece begins one past the module_equal sign
2766 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2767 FREE_C_HEAP_ARRAY(char, module_name);
2768 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2769 return JNI_ENOMEM;
2770 }
2771 } else {
2772 return JNI_ENOMEM;
2773 }
2774 }
2775 return JNI_OK;
2776 }
2777
2778 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2779 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2780 // The min and max sizes match the values in globals.hpp, but scaled
2781 // with K. The values have been chosen so that alignment with page
2782 // size doesn't change the max value, which makes the conversions
2783 // back and forth between Xss value and ThreadStackSize value easier.
2784 // The values have also been chosen to fit inside a 32-bit signed type.
2785 const julong min_ThreadStackSize = 0;
2786 const julong max_ThreadStackSize = 1 * M;
2787
2788 const julong min_size = min_ThreadStackSize * K;
2789 const julong max_size = max_ThreadStackSize * K;
2790
2791 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2792
2793 julong size = 0;
2794 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2795 if (errcode != arg_in_range) {
2796 bool silent = (option == NULL); // Allow testing to silence error messages
2797 if (!silent) {
2798 jio_fprintf(defaultStream::error_stream(),
2799 "Invalid thread stack size: %s\n", option->optionString);
2800 describe_range_error(errcode);
2801 }
2802 return JNI_EINVAL;
2803 }
2804
2805 // Internally track ThreadStackSize in units of 1024 bytes.
2806 const julong size_aligned = align_up(size, K);
2807 assert(size <= size_aligned,
2808 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2809 size, size_aligned);
2810
2811 const julong size_in_K = size_aligned / K;
2812 assert(size_in_K < (julong)max_intx,
2813 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2814 size_in_K);
2815
2816 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2817 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2818 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2819 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2820 max_expanded, size_in_K);
2821
2822 *out_ThreadStackSize = (intx)size_in_K;
2823
2824 return JNI_OK;
2825 }
2826
2827 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2828 // For match_option to return remaining or value part of option string
2829 const char* tail;
2830
2831 // iterate over arguments
2832 for (int index = 0; index < args->nOptions; index++) {
2833 bool is_absolute_path = false; // for -agentpath vs -agentlib
2834
2835 const JavaVMOption* option = args->options + index;
2836
2837 if (!match_option(option, "-Djava.class.path", &tail) &&
2838 !match_option(option, "-Dsun.java.command", &tail) &&
2839 !match_option(option, "-Dsun.java.launcher", &tail)) {
2840
2841 // add all jvm options to the jvm_args string. This string
2842 // is used later to set the java.vm.args PerfData string constant.
2843 // the -Djava.class.path and the -Dsun.java.command options are
2844 // omitted from jvm_args string as each have their own PerfData
2845 // string constant object.
2846 build_jvm_args(option->optionString);
2847 }
2848
2849 // -verbose:[class/module/gc/jni]
2850 if (match_option(option, "-verbose", &tail)) {
2851 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2852 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2853 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2854 } else if (!strcmp(tail, ":module")) {
2855 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2856 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2857 } else if (!strcmp(tail, ":gc")) {
2858 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2859 } else if (!strcmp(tail, ":jni")) {
2860 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2861 return JNI_EINVAL;
2862 }
2863 }
2864 // -da / -ea / -disableassertions / -enableassertions
2865 // These accept an optional class/package name separated by a colon, e.g.,
2866 // -da:java.lang.Thread.
2867 } else if (match_option(option, user_assertion_options, &tail, true)) {
2868 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2869 if (*tail == '\0') {
2870 JavaAssertions::setUserClassDefault(enable);
2871 } else {
2872 assert(*tail == ':', "bogus match by match_option()");
2873 JavaAssertions::addOption(tail + 1, enable);
2874 }
2875 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2876 } else if (match_option(option, system_assertion_options, &tail, false)) {
2877 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2878 JavaAssertions::setSystemClassDefault(enable);
2879 // -bootclasspath:
2880 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2881 jio_fprintf(defaultStream::output_stream(),
2882 "-Xbootclasspath is no longer a supported option.\n");
2883 return JNI_EINVAL;
2884 // -bootclasspath/a:
2885 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2886 Arguments::append_sysclasspath(tail);
2887 // -bootclasspath/p:
2888 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2889 jio_fprintf(defaultStream::output_stream(),
2890 "-Xbootclasspath/p is no longer a supported option.\n");
2891 return JNI_EINVAL;
2892 // -Xrun
2893 } else if (match_option(option, "-Xrun", &tail)) {
2894 if (tail != NULL) {
2895 const char* pos = strchr(tail, ':');
2896 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2897 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2898 jio_snprintf(name, len + 1, "%s", tail);
2899
2900 char *options = NULL;
2901 if(pos != NULL) {
2902 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2903 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2904 }
2905 #if !INCLUDE_JVMTI
2906 if (strcmp(name, "jdwp") == 0) {
2907 jio_fprintf(defaultStream::error_stream(),
2908 "Debugging agents are not supported in this VM\n");
2909 return JNI_ERR;
2910 }
2911 #endif // !INCLUDE_JVMTI
2912 add_init_library(name, options);
2913 }
2914 } else if (match_option(option, "--add-reads=", &tail)) {
2915 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2916 return JNI_ENOMEM;
2917 }
2918 } else if (match_option(option, "--add-exports=", &tail)) {
2919 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2920 return JNI_ENOMEM;
2921 }
2922 } else if (match_option(option, "--add-opens=", &tail)) {
2923 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2924 return JNI_ENOMEM;
2925 }
2926 } else if (match_option(option, "--add-modules=", &tail)) {
2927 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2928 return JNI_ENOMEM;
2929 }
2930 } else if (match_option(option, "--limit-modules=", &tail)) {
2931 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2932 return JNI_ENOMEM;
2933 }
2934 } else if (match_option(option, "--module-path=", &tail)) {
2935 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2936 return JNI_ENOMEM;
2937 }
2938 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2939 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2940 return JNI_ENOMEM;
2941 }
2942 } else if (match_option(option, "--patch-module=", &tail)) {
2943 // --patch-module=<module>=<file>(<pathsep><file>)*
2944 int res = process_patch_mod_option(tail, patch_mod_javabase);
2945 if (res != JNI_OK) {
2946 return res;
2947 }
2948 } else if (match_option(option, "--illegal-access=", &tail)) {
2949 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2950 return JNI_ENOMEM;
2951 }
2952 // -agentlib and -agentpath
2953 } else if (match_option(option, "-agentlib:", &tail) ||
2954 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2955 if(tail != NULL) {
2956 const char* pos = strchr(tail, '=');
2957 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2958 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2959 name[len] = '\0';
2960
2961 char *options = NULL;
2962 if(pos != NULL) {
2963 options = os::strdup_check_oom(pos + 1, mtArguments);
2964 }
2965 #if !INCLUDE_JVMTI
2966 if (valid_jdwp_agent(name, is_absolute_path)) {
2967 jio_fprintf(defaultStream::error_stream(),
2968 "Debugging agents are not supported in this VM\n");
2969 return JNI_ERR;
2970 }
2971 #endif // !INCLUDE_JVMTI
2972 add_init_agent(name, options, is_absolute_path);
2973 }
2974 // -javaagent
2975 } else if (match_option(option, "-javaagent:", &tail)) {
2976 #if !INCLUDE_JVMTI
2977 jio_fprintf(defaultStream::error_stream(),
2978 "Instrumentation agents are not supported in this VM\n");
2979 return JNI_ERR;
2980 #else
2981 if (tail != NULL) {
2982 size_t length = strlen(tail) + 1;
2983 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2984 jio_snprintf(options, length, "%s", tail);
2985 add_init_agent("instrument", options, false);
2986 // java agents need module java.instrument
2987 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2988 return JNI_ENOMEM;
2989 }
2990 }
2991 #endif // !INCLUDE_JVMTI
2992 // -Xnoclassgc
2993 } else if (match_option(option, "-Xnoclassgc")) {
2994 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2995 return JNI_EINVAL;
2996 }
2997 // -Xconcgc
2998 } else if (match_option(option, "-Xconcgc")) {
2999 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
3000 return JNI_EINVAL;
3001 }
3002 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
3003 // -Xnoconcgc
3004 } else if (match_option(option, "-Xnoconcgc")) {
3005 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
3006 return JNI_EINVAL;
3007 }
3008 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
3009 // -Xbatch
3010 } else if (match_option(option, "-Xbatch")) {
3011 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3012 return JNI_EINVAL;
3013 }
3014 // -Xmn for compatibility with other JVM vendors
3015 } else if (match_option(option, "-Xmn", &tail)) {
3016 julong long_initial_young_size = 0;
3017 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
3018 if (errcode != arg_in_range) {
3019 jio_fprintf(defaultStream::error_stream(),
3020 "Invalid initial young generation size: %s\n", option->optionString);
3021 describe_range_error(errcode);
3022 return JNI_EINVAL;
3023 }
3024 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3028 return JNI_EINVAL;
3029 }
3030 // -Xms
3031 } else if (match_option(option, "-Xms", &tail)) {
3032 julong long_initial_heap_size = 0;
3033 // an initial heap size of 0 means automatically determine
3034 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3035 if (errcode != arg_in_range) {
3036 jio_fprintf(defaultStream::error_stream(),
3037 "Invalid initial heap size: %s\n", option->optionString);
3038 describe_range_error(errcode);
3039 return JNI_EINVAL;
3040 }
3041 set_min_heap_size((size_t)long_initial_heap_size);
3042 // Currently the minimum size and the initial heap sizes are the same.
3043 // Can be overridden with -XX:InitialHeapSize.
3044 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
3045 return JNI_EINVAL;
3046 }
3047 // -Xmx
3048 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3049 julong long_max_heap_size = 0;
3050 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3051 if (errcode != arg_in_range) {
3052 jio_fprintf(defaultStream::error_stream(),
3053 "Invalid maximum heap size: %s\n", option->optionString);
3054 describe_range_error(errcode);
3055 return JNI_EINVAL;
3056 }
3057 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
3058 return JNI_EINVAL;
3059 }
3060 // Xmaxf
3061 } else if (match_option(option, "-Xmaxf", &tail)) {
3062 char* err;
3063 int maxf = (int)(strtod(tail, &err) * 100);
3064 if (*err != '\0' || *tail == '\0') {
3065 jio_fprintf(defaultStream::error_stream(),
3066 "Bad max heap free percentage size: %s\n",
3067 option->optionString);
3068 return JNI_EINVAL;
3069 } else {
3070 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 }
3074 // Xminf
3075 } else if (match_option(option, "-Xminf", &tail)) {
3076 char* err;
3077 int minf = (int)(strtod(tail, &err) * 100);
3078 if (*err != '\0' || *tail == '\0') {
3079 jio_fprintf(defaultStream::error_stream(),
3080 "Bad min heap free percentage size: %s\n",
3081 option->optionString);
3082 return JNI_EINVAL;
3083 } else {
3084 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3085 return JNI_EINVAL;
3086 }
3087 }
3088 // -Xss
3089 } else if (match_option(option, "-Xss", &tail)) {
3090 intx value = 0;
3091 jint err = parse_xss(option, tail, &value);
3092 if (err != JNI_OK) {
3093 return err;
3094 }
3095 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
3096 return JNI_EINVAL;
3097 }
3098 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3099 julong long_CodeCacheExpansionSize = 0;
3100 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3101 if (errcode != arg_in_range) {
3102 jio_fprintf(defaultStream::error_stream(),
3103 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3104 os::vm_page_size()/K);
3105 return JNI_EINVAL;
3106 }
3107 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3108 return JNI_EINVAL;
3109 }
3110 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3111 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3112 julong long_ReservedCodeCacheSize = 0;
3113
3114 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3115 if (errcode != arg_in_range) {
3116 jio_fprintf(defaultStream::error_stream(),
3117 "Invalid maximum code cache size: %s.\n", option->optionString);
3118 return JNI_EINVAL;
3119 }
3120 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3121 return JNI_EINVAL;
3122 }
3123 // -XX:NonNMethodCodeHeapSize=
3124 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3125 julong long_NonNMethodCodeHeapSize = 0;
3126
3127 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3128 if (errcode != arg_in_range) {
3129 jio_fprintf(defaultStream::error_stream(),
3130 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3131 return JNI_EINVAL;
3132 }
3133 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3134 return JNI_EINVAL;
3135 }
3136 // -XX:ProfiledCodeHeapSize=
3137 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3138 julong long_ProfiledCodeHeapSize = 0;
3139
3140 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3141 if (errcode != arg_in_range) {
3142 jio_fprintf(defaultStream::error_stream(),
3143 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3144 return JNI_EINVAL;
3145 }
3146 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 // -XX:NonProfiledCodeHeapSizee=
3150 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3151 julong long_NonProfiledCodeHeapSize = 0;
3152
3153 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3154 if (errcode != arg_in_range) {
3155 jio_fprintf(defaultStream::error_stream(),
3156 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3157 return JNI_EINVAL;
3158 }
3159 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 // -green
3163 } else if (match_option(option, "-green")) {
3164 jio_fprintf(defaultStream::error_stream(),
3165 "Green threads support not available\n");
3166 return JNI_EINVAL;
3167 // -native
3168 } else if (match_option(option, "-native")) {
3169 // HotSpot always uses native threads, ignore silently for compatibility
3170 // -Xrs
3171 } else if (match_option(option, "-Xrs")) {
3172 // Classic/EVM option, new functionality
3173 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3174 return JNI_EINVAL;
3175 }
3176 // -Xprof
3177 } else if (match_option(option, "-Xprof")) {
3178 #if INCLUDE_FPROF
3179 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release.");
3180 _has_profile = true;
3181 #else // INCLUDE_FPROF
3182 jio_fprintf(defaultStream::error_stream(),
3183 "Flat profiling is not supported in this VM.\n");
3184 return JNI_ERR;
3185 #endif // INCLUDE_FPROF
3186 // -Xconcurrentio
3187 } else if (match_option(option, "-Xconcurrentio")) {
3188 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3189 return JNI_EINVAL;
3190 }
3191 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3198 return JNI_EINVAL;
3199 }
3200 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3201 return JNI_EINVAL;
3202 }
3203
3204 // -Xinternalversion
3205 } else if (match_option(option, "-Xinternalversion")) {
3206 jio_fprintf(defaultStream::output_stream(), "%s\n",
3207 VM_Version::internal_vm_info_string());
3208 vm_exit(0);
3209 #ifndef PRODUCT
3210 // -Xprintflags
3211 } else if (match_option(option, "-Xprintflags")) {
3212 CommandLineFlags::printFlags(tty, false);
3213 vm_exit(0);
3214 #endif
3215 // -D
3216 } else if (match_option(option, "-D", &tail)) {
3217 const char* value;
3218 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3219 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3220 // abort if -Djava.endorsed.dirs is set
3221 jio_fprintf(defaultStream::output_stream(),
3222 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3223 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3224 return JNI_EINVAL;
3225 }
3226 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3227 *value != '\0' && strcmp(value, "\"\"") != 0) {
3228 // abort if -Djava.ext.dirs is set
3229 jio_fprintf(defaultStream::output_stream(),
3230 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3231 return JNI_EINVAL;
3232 }
3233 // Check for module related properties. They must be set using the modules
3234 // options. For example: use "--add-modules=java.sql", not
3235 // "-Djdk.module.addmods=java.sql"
3236 if (is_internal_module_property(option->optionString + 2)) {
3237 needs_module_property_warning = true;
3238 continue;
3239 }
3240
3241 if (!add_property(tail)) {
3242 return JNI_ENOMEM;
3243 }
3244 // Out of the box management support
3245 if (match_option(option, "-Dcom.sun.management", &tail)) {
3246 #if INCLUDE_MANAGEMENT
3247 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3248 return JNI_EINVAL;
3249 }
3250 // management agent in module jdk.management.agent
3251 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3252 return JNI_ENOMEM;
3253 }
3254 #else
3255 jio_fprintf(defaultStream::output_stream(),
3256 "-Dcom.sun.management is not supported in this VM.\n");
3257 return JNI_ERR;
3258 #endif
3259 }
3260 // -Xint
3261 } else if (match_option(option, "-Xint")) {
3262 set_mode_flags(_int);
3263 // -Xmixed
3264 } else if (match_option(option, "-Xmixed")) {
3265 set_mode_flags(_mixed);
3266 // -Xcomp
3267 } else if (match_option(option, "-Xcomp")) {
3268 // for testing the compiler; turn off all flags that inhibit compilation
3269 set_mode_flags(_comp);
3270 // -Xshare:dump
3271 } else if (match_option(option, "-Xshare:dump")) {
3272 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3273 return JNI_EINVAL;
3274 }
3275 set_mode_flags(_int); // Prevent compilation, which creates objects
3276 // -Xshare:on
3277 } else if (match_option(option, "-Xshare:on")) {
3278 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3279 return JNI_EINVAL;
3280 }
3281 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3282 return JNI_EINVAL;
3283 }
3284 // -Xshare:auto
3285 } else if (match_option(option, "-Xshare:auto")) {
3286 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3287 return JNI_EINVAL;
3288 }
3289 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 // -Xshare:off
3293 } else if (match_option(option, "-Xshare:off")) {
3294 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3295 return JNI_EINVAL;
3296 }
3297 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3298 return JNI_EINVAL;
3299 }
3300 // -Xverify
3301 } else if (match_option(option, "-Xverify", &tail)) {
3302 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3303 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3304 return JNI_EINVAL;
3305 }
3306 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3307 return JNI_EINVAL;
3308 }
3309 } else if (strcmp(tail, ":remote") == 0) {
3310 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3311 return JNI_EINVAL;
3312 }
3313 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3314 return JNI_EINVAL;
3315 }
3316 } else if (strcmp(tail, ":none") == 0) {
3317 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3318 return JNI_EINVAL;
3319 }
3320 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3321 return JNI_EINVAL;
3322 }
3323 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3324 return JNI_EINVAL;
3325 }
3326 // -Xdebug
3327 } else if (match_option(option, "-Xdebug")) {
3328 // note this flag has been used, then ignore
3329 set_xdebug_mode(true);
3330 // -Xnoagent
3331 } else if (match_option(option, "-Xnoagent")) {
3332 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3333 } else if (match_option(option, "-Xloggc:", &tail)) {
3334 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3335 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3336 _gc_log_filename = os::strdup_check_oom(tail);
3337 } else if (match_option(option, "-Xlog", &tail)) {
3338 bool ret = false;
3339 if (strcmp(tail, ":help") == 0) {
3340 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3341 vm_exit(0);
3342 } else if (strcmp(tail, ":disable") == 0) {
3343 LogConfiguration::disable_logging();
3344 ret = true;
3345 } else if (*tail == '\0') {
3346 ret = LogConfiguration::parse_command_line_arguments();
3347 assert(ret, "-Xlog without arguments should never fail to parse");
3348 } else if (*tail == ':') {
3349 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3350 }
3351 if (ret == false) {
3352 jio_fprintf(defaultStream::error_stream(),
3353 "Invalid -Xlog option '-Xlog%s'\n",
3354 tail);
3355 return JNI_EINVAL;
3356 }
3357 // JNI hooks
3358 } else if (match_option(option, "-Xcheck", &tail)) {
3359 if (!strcmp(tail, ":jni")) {
3360 #if !INCLUDE_JNI_CHECK
3361 warning("JNI CHECKING is not supported in this VM");
3362 #else
3363 CheckJNICalls = true;
3364 #endif // INCLUDE_JNI_CHECK
3365 } else if (is_bad_option(option, args->ignoreUnrecognized,
3366 "check")) {
3367 return JNI_EINVAL;
3368 }
3369 } else if (match_option(option, "vfprintf")) {
3370 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3371 } else if (match_option(option, "exit")) {
3372 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3373 } else if (match_option(option, "abort")) {
3374 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3375 // -XX:+AggressiveHeap
3376 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3377 jint result = set_aggressive_heap_flags();
3378 if (result != JNI_OK) {
3379 return result;
3380 }
3381 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3382 // and the last option wins.
3383 } else if (match_option(option, "-XX:+NeverTenure")) {
3384 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3385 return JNI_EINVAL;
3386 }
3387 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3388 return JNI_EINVAL;
3389 }
3390 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3391 return JNI_EINVAL;
3392 }
3393 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3394 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3395 return JNI_EINVAL;
3396 }
3397 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3398 return JNI_EINVAL;
3399 }
3400 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3401 return JNI_EINVAL;
3402 }
3403 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3404 uintx max_tenuring_thresh = 0;
3405 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3406 jio_fprintf(defaultStream::error_stream(),
3407 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3408 return JNI_EINVAL;
3409 }
3410
3411 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3412 return JNI_EINVAL;
3413 }
3414
3415 if (MaxTenuringThreshold == 0) {
3416 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3417 return JNI_EINVAL;
3418 }
3419 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3420 return JNI_EINVAL;
3421 }
3422 } else {
3423 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3424 return JNI_EINVAL;
3425 }
3426 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3427 return JNI_EINVAL;
3428 }
3429 }
3430 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3431 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3432 return JNI_EINVAL;
3433 }
3434 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3435 return JNI_EINVAL;
3436 }
3437 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3438 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3439 return JNI_EINVAL;
3440 }
3441 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3442 return JNI_EINVAL;
3443 }
3444 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3445 #if defined(DTRACE_ENABLED)
3446 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3447 return JNI_EINVAL;
3448 }
3449 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3450 return JNI_EINVAL;
3451 }
3452 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3453 return JNI_EINVAL;
3454 }
3455 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3456 return JNI_EINVAL;
3457 }
3458 #else // defined(DTRACE_ENABLED)
3459 jio_fprintf(defaultStream::error_stream(),
3460 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3461 return JNI_EINVAL;
3462 #endif // defined(DTRACE_ENABLED)
3463 #ifdef ASSERT
3464 } else if (match_option(option, "-XX:+FullGCALot")) {
3465 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3466 return JNI_EINVAL;
3467 }
3468 // disable scavenge before parallel mark-compact
3469 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3470 return JNI_EINVAL;
3471 }
3472 #endif
3473 #if !INCLUDE_MANAGEMENT
3474 } else if (match_option(option, "-XX:+ManagementServer")) {
3475 jio_fprintf(defaultStream::error_stream(),
3476 "ManagementServer is not supported in this VM.\n");
3477 return JNI_ERR;
3478 #endif // INCLUDE_MANAGEMENT
3479 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3480 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3481 // already been handled
3482 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3483 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3484 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3485 return JNI_EINVAL;
3486 }
3487 }
3488 // Unknown option
3489 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3490 return JNI_ERR;
3491 }
3492 }
3493
3494 if (EnableMVT || EnableValhalla) {
3495 if (!create_property("valhalla.enableValueType", "true", InternalProperty)) {
3496 return JNI_ENOMEM;
3497 }
3498 }
3499
3500 // PrintSharedArchiveAndExit will turn on
3501 // -Xshare:on
3502 // -Xlog:class+path=info
3503 if (PrintSharedArchiveAndExit) {
3504 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3505 return JNI_EINVAL;
3506 }
3507 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3508 return JNI_EINVAL;
3509 }
3510 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3511 }
3512
3513 // Change the default value for flags which have different default values
3514 // when working with older JDKs.
3515 #ifdef LINUX
3516 if (JDK_Version::current().compare_major(6) <= 0 &&
3517 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3518 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3519 }
3520 #endif // LINUX
3521 fix_appclasspath();
3522 return JNI_OK;
3523 }
3524
3525 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3526 // For java.base check for duplicate --patch-module options being specified on the command line.
3527 // This check is only required for java.base, all other duplicate module specifications
3528 // will be checked during module system initialization. The module system initialization
3529 // will throw an ExceptionInInitializerError if this situation occurs.
3530 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3531 if (*patch_mod_javabase) {
3532 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3533 } else {
3534 *patch_mod_javabase = true;
3535 }
3536 }
3537
3538 // Create GrowableArray lazily, only if --patch-module has been specified
3539 if (_patch_mod_prefix == NULL) {
3540 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3541 }
3542
3543 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3544 }
3545
3546 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3547 //
3548 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3549 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3550 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3551 // path is treated as the current directory.
3552 //
3553 // This causes problems with CDS, which requires that all directories specified in the classpath
3554 // must be empty. In most cases, applications do NOT want to load classes from the current
3555 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3556 // scripts compatible with CDS.
3557 void Arguments::fix_appclasspath() {
3558 if (IgnoreEmptyClassPaths) {
3559 const char separator = *os::path_separator();
3560 const char* src = _java_class_path->value();
3561
3562 // skip over all the leading empty paths
3563 while (*src == separator) {
3564 src ++;
3565 }
3566
3567 char* copy = os::strdup_check_oom(src, mtArguments);
3568
3569 // trim all trailing empty paths
3570 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3571 *tail = '\0';
3572 }
3573
3574 char from[3] = {separator, separator, '\0'};
3575 char to [2] = {separator, '\0'};
3576 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3577 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3578 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3579 }
3580
3581 _java_class_path->set_writeable_value(copy);
3582 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3583 }
3584 }
3585
3586 static bool has_jar_files(const char* directory) {
3587 DIR* dir = os::opendir(directory);
3588 if (dir == NULL) return false;
3589
3590 struct dirent *entry;
3591 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3592 bool hasJarFile = false;
3593 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3594 const char* name = entry->d_name;
3595 const char* ext = name + strlen(name) - 4;
3596 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3597 }
3598 FREE_C_HEAP_ARRAY(char, dbuf);
3599 os::closedir(dir);
3600 return hasJarFile ;
3601 }
3602
3603 static int check_non_empty_dirs(const char* path) {
3604 const char separator = *os::path_separator();
3605 const char* const end = path + strlen(path);
3606 int nonEmptyDirs = 0;
3607 while (path < end) {
3608 const char* tmp_end = strchr(path, separator);
3609 if (tmp_end == NULL) {
3610 if (has_jar_files(path)) {
3611 nonEmptyDirs++;
3612 jio_fprintf(defaultStream::output_stream(),
3613 "Non-empty directory: %s\n", path);
3614 }
3615 path = end;
3616 } else {
3617 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3618 memcpy(dirpath, path, tmp_end - path);
3619 dirpath[tmp_end - path] = '\0';
3620 if (has_jar_files(dirpath)) {
3621 nonEmptyDirs++;
3622 jio_fprintf(defaultStream::output_stream(),
3623 "Non-empty directory: %s\n", dirpath);
3624 }
3625 FREE_C_HEAP_ARRAY(char, dirpath);
3626 path = tmp_end + 1;
3627 }
3628 }
3629 return nonEmptyDirs;
3630 }
3631
3632 jint Arguments::finalize_vm_init_args() {
3633 // check if the default lib/endorsed directory exists; if so, error
3634 char path[JVM_MAXPATHLEN];
3635 const char* fileSep = os::file_separator();
3636 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3637
3638 if (CheckEndorsedAndExtDirs) {
3639 int nonEmptyDirs = 0;
3640 // check endorsed directory
3641 nonEmptyDirs += check_non_empty_dirs(path);
3642 // check the extension directories
3643 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3644 if (nonEmptyDirs > 0) {
3645 return JNI_ERR;
3646 }
3647 }
3648
3649 DIR* dir = os::opendir(path);
3650 if (dir != NULL) {
3651 jio_fprintf(defaultStream::output_stream(),
3652 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3653 "in modular form will be supported via the concept of upgradeable modules.\n");
3654 os::closedir(dir);
3655 return JNI_ERR;
3656 }
3657
3658 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3659 dir = os::opendir(path);
3660 if (dir != NULL) {
3661 jio_fprintf(defaultStream::output_stream(),
3662 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3663 "Use -classpath instead.\n.");
3664 os::closedir(dir);
3665 return JNI_ERR;
3666 }
3667
3668 // This must be done after all arguments have been processed.
3669 // java_compiler() true means set to "NONE" or empty.
3670 if (java_compiler() && !xdebug_mode()) {
3671 // For backwards compatibility, we switch to interpreted mode if
3672 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3673 // not specified.
3674 set_mode_flags(_int);
3675 }
3676
3677 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3678 // but like -Xint, leave compilation thresholds unaffected.
3679 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3680 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3681 set_mode_flags(_int);
3682 }
3683
3684 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3685 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3686 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3687 }
3688
3689 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3690 // Don't degrade server performance for footprint
3691 if (FLAG_IS_DEFAULT(UseLargePages) &&
3692 MaxHeapSize < LargePageHeapSizeThreshold) {
3693 // No need for large granularity pages w/small heaps.
3694 // Note that large pages are enabled/disabled for both the
3695 // Java heap and the code cache.
3696 FLAG_SET_DEFAULT(UseLargePages, false);
3697 }
3698
3699 #elif defined(COMPILER2)
3700 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3701 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3702 }
3703 #endif
3704
3705 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3706 UNSUPPORTED_OPTION(ProfileInterpreter);
3707 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3708 #endif
3709
3710 #ifndef TIERED
3711 // Tiered compilation is undefined.
3712 UNSUPPORTED_OPTION(TieredCompilation);
3713 #endif
3714
3715 #if INCLUDE_JVMCI
3716 if (EnableJVMCI &&
3717 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3718 return JNI_ENOMEM;
3719 }
3720 #endif
3721
3722 // If we are running in a headless jre, force java.awt.headless property
3723 // to be true unless the property has already been set.
3724 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3725 if (os::is_headless_jre()) {
3726 const char* headless = Arguments::get_property("java.awt.headless");
3727 if (headless == NULL) {
3728 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3729 if (headless_env == NULL) {
3730 if (!add_property("java.awt.headless=true")) {
3731 return JNI_ENOMEM;
3732 }
3733 } else {
3734 char buffer[256];
3735 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3736 if (!add_property(buffer)) {
3737 return JNI_ENOMEM;
3738 }
3739 }
3740 }
3741 }
3742
3743 if (!check_vm_args_consistency()) {
3744 return JNI_ERR;
3745 }
3746
3747 #if INCLUDE_JVMCI
3748 if (UseJVMCICompiler) {
3749 Compilation_mode = CompMode_server;
3750 }
3751 #endif
3752
3753 return JNI_OK;
3754 }
3755
3756 // Helper class for controlling the lifetime of JavaVMInitArgs
3757 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3758 // deleted on the destruction of the ScopedVMInitArgs object.
3759 class ScopedVMInitArgs : public StackObj {
3760 private:
3761 JavaVMInitArgs _args;
3762 char* _container_name;
3763 bool _is_set;
3764 char* _vm_options_file_arg;
3765
3766 public:
3767 ScopedVMInitArgs(const char *container_name) {
3768 _args.version = JNI_VERSION_1_2;
3769 _args.nOptions = 0;
3770 _args.options = NULL;
3771 _args.ignoreUnrecognized = false;
3772 _container_name = (char *)container_name;
3773 _is_set = false;
3774 _vm_options_file_arg = NULL;
3775 }
3776
3777 // Populates the JavaVMInitArgs object represented by this
3778 // ScopedVMInitArgs object with the arguments in options. The
3779 // allocated memory is deleted by the destructor. If this method
3780 // returns anything other than JNI_OK, then this object is in a
3781 // partially constructed state, and should be abandoned.
3782 jint set_args(GrowableArray<JavaVMOption>* options) {
3783 _is_set = true;
3784 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3785 JavaVMOption, options->length(), mtArguments);
3786 if (options_arr == NULL) {
3787 return JNI_ENOMEM;
3788 }
3789 _args.options = options_arr;
3790
3791 for (int i = 0; i < options->length(); i++) {
3792 options_arr[i] = options->at(i);
3793 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3794 if (options_arr[i].optionString == NULL) {
3795 // Rely on the destructor to do cleanup.
3796 _args.nOptions = i;
3797 return JNI_ENOMEM;
3798 }
3799 }
3800
3801 _args.nOptions = options->length();
3802 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3803 return JNI_OK;
3804 }
3805
3806 JavaVMInitArgs* get() { return &_args; }
3807 char* container_name() { return _container_name; }
3808 bool is_set() { return _is_set; }
3809 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3810 char* vm_options_file_arg() { return _vm_options_file_arg; }
3811
3812 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3813 if (_vm_options_file_arg != NULL) {
3814 os::free(_vm_options_file_arg);
3815 }
3816 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3817 }
3818
3819 ~ScopedVMInitArgs() {
3820 if (_vm_options_file_arg != NULL) {
3821 os::free(_vm_options_file_arg);
3822 }
3823 if (_args.options == NULL) return;
3824 for (int i = 0; i < _args.nOptions; i++) {
3825 os::free(_args.options[i].optionString);
3826 }
3827 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3828 }
3829
3830 // Insert options into this option list, to replace option at
3831 // vm_options_file_pos (-XX:VMOptionsFile)
3832 jint insert(const JavaVMInitArgs* args,
3833 const JavaVMInitArgs* args_to_insert,
3834 const int vm_options_file_pos) {
3835 assert(_args.options == NULL, "shouldn't be set yet");
3836 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3837 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3838
3839 int length = args->nOptions + args_to_insert->nOptions - 1;
3840 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3841 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3842 for (int i = 0; i < args->nOptions; i++) {
3843 if (i == vm_options_file_pos) {
3844 // insert the new options starting at the same place as the
3845 // -XX:VMOptionsFile option
3846 for (int j = 0; j < args_to_insert->nOptions; j++) {
3847 options->push(args_to_insert->options[j]);
3848 }
3849 } else {
3850 options->push(args->options[i]);
3851 }
3852 }
3853 // make into options array
3854 jint result = set_args(options);
3855 delete options;
3856 return result;
3857 }
3858 };
3859
3860 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3861 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3862 }
3863
3864 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3865 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3866 }
3867
3868 jint Arguments::parse_options_environment_variable(const char* name,
3869 ScopedVMInitArgs* vm_args) {
3870 char *buffer = ::getenv(name);
3871
3872 // Don't check this environment variable if user has special privileges
3873 // (e.g. unix su command).
3874 if (buffer == NULL || os::have_special_privileges()) {
3875 return JNI_OK;
3876 }
3877
3878 if ((buffer = os::strdup(buffer)) == NULL) {
3879 return JNI_ENOMEM;
3880 }
3881
3882 jio_fprintf(defaultStream::error_stream(),
3883 "Picked up %s: %s\n", name, buffer);
3884
3885 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3886
3887 os::free(buffer);
3888 return retcode;
3889 }
3890
3891 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3892 // read file into buffer
3893 int fd = ::open(file_name, O_RDONLY);
3894 if (fd < 0) {
3895 jio_fprintf(defaultStream::error_stream(),
3896 "Could not open options file '%s'\n",
3897 file_name);
3898 return JNI_ERR;
3899 }
3900
3901 struct stat stbuf;
3902 int retcode = os::stat(file_name, &stbuf);
3903 if (retcode != 0) {
3904 jio_fprintf(defaultStream::error_stream(),
3905 "Could not stat options file '%s'\n",
3906 file_name);
3907 os::close(fd);
3908 return JNI_ERR;
3909 }
3910
3911 if (stbuf.st_size == 0) {
3912 // tell caller there is no option data and that is ok
3913 os::close(fd);
3914 return JNI_OK;
3915 }
3916
3917 // '+ 1' for NULL termination even with max bytes
3918 size_t bytes_alloc = stbuf.st_size + 1;
3919
3920 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3921 if (NULL == buf) {
3922 jio_fprintf(defaultStream::error_stream(),
3923 "Could not allocate read buffer for options file parse\n");
3924 os::close(fd);
3925 return JNI_ENOMEM;
3926 }
3927
3928 memset(buf, 0, bytes_alloc);
3929
3930 // Fill buffer
3931 // Use ::read() instead of os::read because os::read()
3932 // might do a thread state transition
3933 // and it is too early for that here
3934
3935 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3936 os::close(fd);
3937 if (bytes_read < 0) {
3938 FREE_C_HEAP_ARRAY(char, buf);
3939 jio_fprintf(defaultStream::error_stream(),
3940 "Could not read options file '%s'\n", file_name);
3941 return JNI_ERR;
3942 }
3943
3944 if (bytes_read == 0) {
3945 // tell caller there is no option data and that is ok
3946 FREE_C_HEAP_ARRAY(char, buf);
3947 return JNI_OK;
3948 }
3949
3950 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3951
3952 FREE_C_HEAP_ARRAY(char, buf);
3953 return retcode;
3954 }
3955
3956 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3957 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3958
3959 // some pointers to help with parsing
3960 char *buffer_end = buffer + buf_len;
3961 char *opt_hd = buffer;
3962 char *wrt = buffer;
3963 char *rd = buffer;
3964
3965 // parse all options
3966 while (rd < buffer_end) {
3967 // skip leading white space from the input string
3968 while (rd < buffer_end && isspace(*rd)) {
3969 rd++;
3970 }
3971
3972 if (rd >= buffer_end) {
3973 break;
3974 }
3975
3976 // Remember this is where we found the head of the token.
3977 opt_hd = wrt;
3978
3979 // Tokens are strings of non white space characters separated
3980 // by one or more white spaces.
3981 while (rd < buffer_end && !isspace(*rd)) {
3982 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3983 int quote = *rd; // matching quote to look for
3984 rd++; // don't copy open quote
3985 while (rd < buffer_end && *rd != quote) {
3986 // include everything (even spaces)
3987 // up until the close quote
3988 *wrt++ = *rd++; // copy to option string
3989 }
3990
3991 if (rd < buffer_end) {
3992 rd++; // don't copy close quote
3993 } else {
3994 // did not see closing quote
3995 jio_fprintf(defaultStream::error_stream(),
3996 "Unmatched quote in %s\n", name);
3997 delete options;
3998 return JNI_ERR;
3999 }
4000 } else {
4001 *wrt++ = *rd++; // copy to option string
4002 }
4003 }
4004
4005 // steal a white space character and set it to NULL
4006 *wrt++ = '\0';
4007 // We now have a complete token
4008
4009 JavaVMOption option;
4010 option.optionString = opt_hd;
4011 option.extraInfo = NULL;
4012
4013 options->append(option); // Fill in option
4014
4015 rd++; // Advance to next character
4016 }
4017
4018 // Fill out JavaVMInitArgs structure.
4019 jint status = vm_args->set_args(options);
4020
4021 delete options;
4022 return status;
4023 }
4024
4025 void Arguments::set_shared_spaces_flags() {
4026 if (DumpSharedSpaces) {
4027 if (FailOverToOldVerifier) {
4028 // Don't fall back to the old verifier on verification failure. If a
4029 // class fails verification with the split verifier, it might fail the
4030 // CDS runtime verifier constraint check. In that case, we don't want
4031 // to share the class. We only archive classes that pass the split verifier.
4032 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
4033 }
4034
4035 if (RequireSharedSpaces) {
4036 warning("Cannot dump shared archive while using shared archive");
4037 }
4038 UseSharedSpaces = false;
4039 #ifdef _LP64
4040 if (!UseCompressedOops || !UseCompressedClassPointers) {
4041 vm_exit_during_initialization(
4042 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4043 }
4044 } else {
4045 if (!UseCompressedOops || !UseCompressedClassPointers) {
4046 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4047 }
4048 #endif
4049 }
4050 }
4051
4052 // Sharing support
4053 // Construct the path to the archive
4054 static char* get_shared_archive_path() {
4055 char *shared_archive_path;
4056 if (SharedArchiveFile == NULL) {
4057 char jvm_path[JVM_MAXPATHLEN];
4058 os::jvm_path(jvm_path, sizeof(jvm_path));
4059 char *end = strrchr(jvm_path, *os::file_separator());
4060 if (end != NULL) *end = '\0';
4061 size_t jvm_path_len = strlen(jvm_path);
4062 size_t file_sep_len = strlen(os::file_separator());
4063 const size_t len = jvm_path_len + file_sep_len + 20;
4064 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4065 if (shared_archive_path != NULL) {
4066 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4067 jvm_path, os::file_separator());
4068 }
4069 } else {
4070 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4071 }
4072 return shared_archive_path;
4073 }
4074
4075 #ifndef PRODUCT
4076 // Determine whether LogVMOutput should be implicitly turned on.
4077 static bool use_vm_log() {
4078 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4079 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4080 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4081 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4082 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4083 return true;
4084 }
4085
4086 #ifdef COMPILER1
4087 if (PrintC1Statistics) {
4088 return true;
4089 }
4090 #endif // COMPILER1
4091
4092 #ifdef COMPILER2
4093 if (PrintOptoAssembly || PrintOptoStatistics) {
4094 return true;
4095 }
4096 #endif // COMPILER2
4097
4098 return false;
4099 }
4100
4101 #endif // PRODUCT
4102
4103 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4104 for (int index = 0; index < args->nOptions; index++) {
4105 const JavaVMOption* option = args->options + index;
4106 const char* tail;
4107 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4108 return true;
4109 }
4110 }
4111 return false;
4112 }
4113
4114 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4115 const char* vm_options_file,
4116 const int vm_options_file_pos,
4117 ScopedVMInitArgs* vm_options_file_args,
4118 ScopedVMInitArgs* args_out) {
4119 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4120 if (code != JNI_OK) {
4121 return code;
4122 }
4123
4124 if (vm_options_file_args->get()->nOptions < 1) {
4125 return JNI_OK;
4126 }
4127
4128 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4129 jio_fprintf(defaultStream::error_stream(),
4130 "A VM options file may not refer to a VM options file. "
4131 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4132 "options file '%s' in options container '%s' is an error.\n",
4133 vm_options_file_args->vm_options_file_arg(),
4134 vm_options_file_args->container_name());
4135 return JNI_EINVAL;
4136 }
4137
4138 return args_out->insert(args, vm_options_file_args->get(),
4139 vm_options_file_pos);
4140 }
4141
4142 // Expand -XX:VMOptionsFile found in args_in as needed.
4143 // mod_args and args_out parameters may return values as needed.
4144 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4145 ScopedVMInitArgs* mod_args,
4146 JavaVMInitArgs** args_out) {
4147 jint code = match_special_option_and_act(args_in, mod_args);
4148 if (code != JNI_OK) {
4149 return code;
4150 }
4151
4152 if (mod_args->is_set()) {
4153 // args_in contains -XX:VMOptionsFile and mod_args contains the
4154 // original options from args_in along with the options expanded
4155 // from the VMOptionsFile. Return a short-hand to the caller.
4156 *args_out = mod_args->get();
4157 } else {
4158 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4159 }
4160 return JNI_OK;
4161 }
4162
4163 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4164 ScopedVMInitArgs* args_out) {
4165 // Remaining part of option string
4166 const char* tail;
4167 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4168
4169 for (int index = 0; index < args->nOptions; index++) {
4170 const JavaVMOption* option = args->options + index;
4171 if (ArgumentsExt::process_options(option)) {
4172 continue;
4173 }
4174 if (match_option(option, "-XX:Flags=", &tail)) {
4175 Arguments::set_jvm_flags_file(tail);
4176 continue;
4177 }
4178 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4179 if (vm_options_file_args.found_vm_options_file_arg()) {
4180 jio_fprintf(defaultStream::error_stream(),
4181 "The option '%s' is already specified in the options "
4182 "container '%s' so the specification of '%s' in the "
4183 "same options container is an error.\n",
4184 vm_options_file_args.vm_options_file_arg(),
4185 vm_options_file_args.container_name(),
4186 option->optionString);
4187 return JNI_EINVAL;
4188 }
4189 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4190 // If there's a VMOptionsFile, parse that
4191 jint code = insert_vm_options_file(args, tail, index,
4192 &vm_options_file_args, args_out);
4193 if (code != JNI_OK) {
4194 return code;
4195 }
4196 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4197 if (args_out->is_set()) {
4198 // The VMOptions file inserted some options so switch 'args'
4199 // to the new set of options, and continue processing which
4200 // preserves "last option wins" semantics.
4201 args = args_out->get();
4202 // The first option from the VMOptionsFile replaces the
4203 // current option. So we back track to process the
4204 // replacement option.
4205 index--;
4206 }
4207 continue;
4208 }
4209 if (match_option(option, "-XX:+PrintVMOptions")) {
4210 PrintVMOptions = true;
4211 continue;
4212 }
4213 if (match_option(option, "-XX:-PrintVMOptions")) {
4214 PrintVMOptions = false;
4215 continue;
4216 }
4217 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4218 IgnoreUnrecognizedVMOptions = true;
4219 continue;
4220 }
4221 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4222 IgnoreUnrecognizedVMOptions = false;
4223 continue;
4224 }
4225 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4226 CommandLineFlags::printFlags(tty, false);
4227 vm_exit(0);
4228 }
4229 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4230 #if INCLUDE_NMT
4231 // The launcher did not setup nmt environment variable properly.
4232 if (!MemTracker::check_launcher_nmt_support(tail)) {
4233 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4234 }
4235
4236 // Verify if nmt option is valid.
4237 if (MemTracker::verify_nmt_option()) {
4238 // Late initialization, still in single-threaded mode.
4239 if (MemTracker::tracking_level() >= NMT_summary) {
4240 MemTracker::init();
4241 }
4242 } else {
4243 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4244 }
4245 continue;
4246 #else
4247 jio_fprintf(defaultStream::error_stream(),
4248 "Native Memory Tracking is not supported in this VM\n");
4249 return JNI_ERR;
4250 #endif
4251 }
4252
4253 #ifndef PRODUCT
4254 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4255 CommandLineFlags::printFlags(tty, true);
4256 vm_exit(0);
4257 }
4258 #endif
4259 }
4260 return JNI_OK;
4261 }
4262
4263 static void print_options(const JavaVMInitArgs *args) {
4264 const char* tail;
4265 for (int index = 0; index < args->nOptions; index++) {
4266 const JavaVMOption *option = args->options + index;
4267 if (match_option(option, "-XX:", &tail)) {
4268 logOption(tail);
4269 }
4270 }
4271 }
4272
4273 bool Arguments::handle_deprecated_print_gc_flags() {
4274 if (PrintGC) {
4275 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4276 }
4277 if (PrintGCDetails) {
4278 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4279 }
4280
4281 if (_gc_log_filename != NULL) {
4282 // -Xloggc was used to specify a filename
4283 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4284
4285 LogTarget(Error, logging) target;
4286 LogStream errstream(target);
4287 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4288 } else if (PrintGC || PrintGCDetails) {
4289 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4290 }
4291 return true;
4292 }
4293
4294 void Arguments::handle_extra_cms_flags(const char* msg) {
4295 SpecialFlag flag;
4296 const char *flag_name = "UseConcMarkSweepGC";
4297 if (lookup_special_flag(flag_name, flag)) {
4298 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4299 warning("%s", msg);
4300 }
4301 }
4302
4303 // Parse entry point called from JNI_CreateJavaVM
4304
4305 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4306 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4307
4308 // Initialize ranges, constraints and writeables
4309 CommandLineFlagRangeList::init();
4310 CommandLineFlagConstraintList::init();
4311 CommandLineFlagWriteableList::init();
4312
4313 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4314 const char* hotspotrc = ".hotspotrc";
4315 bool settings_file_specified = false;
4316 bool needs_hotspotrc_warning = false;
4317 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4318 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4319
4320 // Pointers to current working set of containers
4321 JavaVMInitArgs* cur_cmd_args;
4322 JavaVMInitArgs* cur_java_options_args;
4323 JavaVMInitArgs* cur_java_tool_options_args;
4324
4325 // Containers for modified/expanded options
4326 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4327 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4328 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4329
4330
4331 jint code =
4332 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4333 if (code != JNI_OK) {
4334 return code;
4335 }
4336
4337 code = parse_java_options_environment_variable(&initial_java_options_args);
4338 if (code != JNI_OK) {
4339 return code;
4340 }
4341
4342 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4343 &mod_java_tool_options_args,
4344 &cur_java_tool_options_args);
4345 if (code != JNI_OK) {
4346 return code;
4347 }
4348
4349 code = expand_vm_options_as_needed(initial_cmd_args,
4350 &mod_cmd_args,
4351 &cur_cmd_args);
4352 if (code != JNI_OK) {
4353 return code;
4354 }
4355
4356 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4357 &mod_java_options_args,
4358 &cur_java_options_args);
4359 if (code != JNI_OK) {
4360 return code;
4361 }
4362
4363 const char* flags_file = Arguments::get_jvm_flags_file();
4364 settings_file_specified = (flags_file != NULL);
4365
4366 if (IgnoreUnrecognizedVMOptions) {
4367 cur_cmd_args->ignoreUnrecognized = true;
4368 cur_java_tool_options_args->ignoreUnrecognized = true;
4369 cur_java_options_args->ignoreUnrecognized = true;
4370 }
4371
4372 // Parse specified settings file
4373 if (settings_file_specified) {
4374 if (!process_settings_file(flags_file, true,
4375 cur_cmd_args->ignoreUnrecognized)) {
4376 return JNI_EINVAL;
4377 }
4378 } else {
4379 #ifdef ASSERT
4380 // Parse default .hotspotrc settings file
4381 if (!process_settings_file(".hotspotrc", false,
4382 cur_cmd_args->ignoreUnrecognized)) {
4383 return JNI_EINVAL;
4384 }
4385 #else
4386 struct stat buf;
4387 if (os::stat(hotspotrc, &buf) == 0) {
4388 needs_hotspotrc_warning = true;
4389 }
4390 #endif
4391 }
4392
4393 if (PrintVMOptions) {
4394 print_options(cur_java_tool_options_args);
4395 print_options(cur_cmd_args);
4396 print_options(cur_java_options_args);
4397 }
4398
4399 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4400 jint result = parse_vm_init_args(cur_java_tool_options_args,
4401 cur_java_options_args,
4402 cur_cmd_args);
4403
4404 if (result != JNI_OK) {
4405 return result;
4406 }
4407
4408 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4409 SharedArchivePath = get_shared_archive_path();
4410 if (SharedArchivePath == NULL) {
4411 return JNI_ENOMEM;
4412 }
4413
4414 // Set up VerifySharedSpaces
4415 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4416 VerifySharedSpaces = true;
4417 }
4418
4419 // Delay warning until here so that we've had a chance to process
4420 // the -XX:-PrintWarnings flag
4421 if (needs_hotspotrc_warning) {
4422 warning("%s file is present but has been ignored. "
4423 "Run with -XX:Flags=%s to load the file.",
4424 hotspotrc, hotspotrc);
4425 }
4426
4427 if (needs_module_property_warning) {
4428 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4429 " names that are reserved for internal use.");
4430 }
4431
4432 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4433 UNSUPPORTED_OPTION(UseLargePages);
4434 #endif
4435
4436 ArgumentsExt::report_unsupported_options();
4437
4438 #ifndef PRODUCT
4439 if (TraceBytecodesAt != 0) {
4440 TraceBytecodes = true;
4441 }
4442 if (CountCompiledCalls) {
4443 if (UseCounterDecay) {
4444 warning("UseCounterDecay disabled because CountCalls is set");
4445 UseCounterDecay = false;
4446 }
4447 }
4448 #endif // PRODUCT
4449
4450 if (ScavengeRootsInCode == 0) {
4451 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4452 warning("Forcing ScavengeRootsInCode non-zero");
4453 }
4454 ScavengeRootsInCode = 1;
4455 }
4456
4457 if (!handle_deprecated_print_gc_flags()) {
4458 return JNI_EINVAL;
4459 }
4460
4461 // Set object alignment values.
4462 set_object_alignment();
4463
4464 #if !INCLUDE_CDS
4465 if (DumpSharedSpaces || RequireSharedSpaces) {
4466 jio_fprintf(defaultStream::error_stream(),
4467 "Shared spaces are not supported in this VM\n");
4468 return JNI_ERR;
4469 }
4470 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4471 log_is_enabled(Info, cds)) {
4472 warning("Shared spaces are not supported in this VM");
4473 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4474 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4475 }
4476 no_shared_spaces("CDS Disabled");
4477 #endif // INCLUDE_CDS
4478
4479 return JNI_OK;
4480 }
4481
4482 jint Arguments::apply_ergo() {
4483 // Set flags based on ergonomics.
4484 set_ergonomics_flags();
4485
4486 #if INCLUDE_JVMCI
4487 set_jvmci_specific_flags();
4488 #endif
4489
4490 set_shared_spaces_flags();
4491
4492 #if defined(SPARC)
4493 // BIS instructions require 'membar' instruction regardless of the number
4494 // of CPUs because in virtualized/container environments which might use only 1
4495 // CPU, BIS instructions may produce incorrect results.
4496
4497 if (FLAG_IS_DEFAULT(AssumeMP)) {
4498 FLAG_SET_DEFAULT(AssumeMP, true);
4499 }
4500 #endif
4501
4502 // Check the GC selections again.
4503 if (!check_gc_consistency()) {
4504 return JNI_EINVAL;
4505 }
4506
4507 if (TieredCompilation) {
4508 set_tiered_flags();
4509 } else {
4510 int max_compilation_policy_choice = 1;
4511 #ifdef COMPILER2
4512 if (is_server_compilation_mode_vm()) {
4513 max_compilation_policy_choice = 2;
4514 }
4515 #endif
4516 // Check if the policy is valid.
4517 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4518 vm_exit_during_initialization(
4519 "Incompatible compilation policy selected", NULL);
4520 }
4521 // Scale CompileThreshold
4522 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4523 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4524 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4525 }
4526 }
4527
4528 #ifdef COMPILER2
4529 #ifndef PRODUCT
4530 if (PrintIdealGraphLevel > 0) {
4531 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4532 }
4533 #endif
4534 #endif
4535
4536 // Set heap size based on available physical memory
4537 set_heap_size();
4538
4539 ArgumentsExt::set_gc_specific_flags();
4540
4541 // Initialize Metaspace flags and alignments
4542 Metaspace::ergo_initialize();
4543
4544 // Set bytecode rewriting flags
4545 set_bytecode_flags();
4546
4547 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4548 jint code = set_aggressive_opts_flags();
4549 if (code != JNI_OK) {
4550 return code;
4551 }
4552
4553 // Turn off biased locking for locking debug mode flags,
4554 // which are subtly different from each other but neither works with
4555 // biased locking
4556 if (UseHeavyMonitors
4557 #ifdef COMPILER1
4558 || !UseFastLocking
4559 #endif // COMPILER1
4560 #if INCLUDE_JVMCI
4561 || !JVMCIUseFastLocking
4562 #endif
4563 ) {
4564 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4565 // flag set to true on command line; warn the user that they
4566 // can't enable biased locking here
4567 warning("Biased Locking is not supported with locking debug flags"
4568 "; ignoring UseBiasedLocking flag." );
4569 }
4570 UseBiasedLocking = false;
4571 }
4572
4573 #ifdef CC_INTERP
4574 // Clear flags not supported on zero.
4575 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4576 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4577 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4578 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4579 #endif // CC_INTERP
4580
4581 #ifdef COMPILER2
4582 if (!EliminateLocks) {
4583 EliminateNestedLocks = false;
4584 }
4585 if (!Inline) {
4586 IncrementalInline = false;
4587 }
4588 #ifndef PRODUCT
4589 if (!IncrementalInline) {
4590 AlwaysIncrementalInline = false;
4591 }
4592 #endif
4593 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4594 // nothing to use the profiling, turn if off
4595 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4596 }
4597 #endif
4598
4599 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4600 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4601 DebugNonSafepoints = true;
4602 }
4603
4604 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4605 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4606 }
4607
4608 if (UseOnStackReplacement && !UseLoopCounter) {
4609 warning("On-stack-replacement requires loop counters; enabling loop counters");
4610 FLAG_SET_DEFAULT(UseLoopCounter, true);
4611 }
4612
4613 #ifndef PRODUCT
4614 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4615 if (use_vm_log()) {
4616 LogVMOutput = true;
4617 }
4618 }
4619 #endif // PRODUCT
4620
4621 if (PrintCommandLineFlags) {
4622 CommandLineFlags::printSetFlags(tty);
4623 }
4624
4625 // Apply CPU specific policy for the BiasedLocking
4626 if (UseBiasedLocking) {
4627 if (!VM_Version::use_biased_locking() &&
4628 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4629 UseBiasedLocking = false;
4630 }
4631 }
4632 #ifdef COMPILER2
4633 if (!UseBiasedLocking || EmitSync != 0) {
4634 UseOptoBiasInlining = false;
4635 }
4636 #endif
4637
4638 return JNI_OK;
4639 }
4640
4641 jint Arguments::adjust_after_os() {
4642 if (UseNUMA) {
4643 if (UseParallelGC || UseParallelOldGC) {
4644 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4645 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4646 }
4647 }
4648 // UseNUMAInterleaving is set to ON for all collectors and
4649 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4650 // such as the parallel collector for Linux and Solaris will
4651 // interleave old gen and survivor spaces on top of NUMA
4652 // allocation policy for the eden space.
4653 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4654 // all platforms and ParallelGC on Windows will interleave all
4655 // of the heap spaces across NUMA nodes.
4656 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4657 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4658 }
4659 }
4660 return JNI_OK;
4661 }
4662
4663 int Arguments::PropertyList_count(SystemProperty* pl) {
4664 int count = 0;
4665 while(pl != NULL) {
4666 count++;
4667 pl = pl->next();
4668 }
4669 return count;
4670 }
4671
4672 // Return the number of readable properties.
4673 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4674 int count = 0;
4675 while(pl != NULL) {
4676 if (pl->is_readable()) {
4677 count++;
4678 }
4679 pl = pl->next();
4680 }
4681 return count;
4682 }
4683
4684 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4685 assert(key != NULL, "just checking");
4686 SystemProperty* prop;
4687 for (prop = pl; prop != NULL; prop = prop->next()) {
4688 if (strcmp(key, prop->key()) == 0) return prop->value();
4689 }
4690 return NULL;
4691 }
4692
4693 // Return the value of the requested property provided that it is a readable property.
4694 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4695 assert(key != NULL, "just checking");
4696 SystemProperty* prop;
4697 // Return the property value if the keys match and the property is not internal or
4698 // it's the special internal property "jdk.boot.class.path.append".
4699 for (prop = pl; prop != NULL; prop = prop->next()) {
4700 if (strcmp(key, prop->key()) == 0) {
4701 if (!prop->internal()) {
4702 return prop->value();
4703 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4704 return prop->value();
4705 } else {
4706 // Property is internal and not jdk.boot.class.path.append so return NULL.
4707 return NULL;
4708 }
4709 }
4710 }
4711 return NULL;
4712 }
4713
4714 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4715 int count = 0;
4716 const char* ret_val = NULL;
4717
4718 while(pl != NULL) {
4719 if(count >= index) {
4720 ret_val = pl->key();
4721 break;
4722 }
4723 count++;
4724 pl = pl->next();
4725 }
4726
4727 return ret_val;
4728 }
4729
4730 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4731 int count = 0;
4732 char* ret_val = NULL;
4733
4734 while(pl != NULL) {
4735 if(count >= index) {
4736 ret_val = pl->value();
4737 break;
4738 }
4739 count++;
4740 pl = pl->next();
4741 }
4742
4743 return ret_val;
4744 }
4745
4746 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4747 SystemProperty* p = *plist;
4748 if (p == NULL) {
4749 *plist = new_p;
4750 } else {
4751 while (p->next() != NULL) {
4752 p = p->next();
4753 }
4754 p->set_next(new_p);
4755 }
4756 }
4757
4758 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4759 bool writeable, bool internal) {
4760 if (plist == NULL)
4761 return;
4762
4763 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4764 PropertyList_add(plist, new_p);
4765 }
4766
4767 void Arguments::PropertyList_add(SystemProperty *element) {
4768 PropertyList_add(&_system_properties, element);
4769 }
4770
4771 // This add maintains unique property key in the list.
4772 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4773 PropertyAppendable append, PropertyWriteable writeable,
4774 PropertyInternal internal) {
4775 if (plist == NULL)
4776 return;
4777
4778 // If property key exist then update with new value.
4779 SystemProperty* prop;
4780 for (prop = *plist; prop != NULL; prop = prop->next()) {
4781 if (strcmp(k, prop->key()) == 0) {
4782 if (append == AppendProperty) {
4783 prop->append_value(v);
4784 } else {
4785 prop->set_value(v);
4786 }
4787 return;
4788 }
4789 }
4790
4791 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4792 }
4793
4794 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4795 // Returns true if all of the source pointed by src has been copied over to
4796 // the destination buffer pointed by buf. Otherwise, returns false.
4797 // Notes:
4798 // 1. If the length (buflen) of the destination buffer excluding the
4799 // NULL terminator character is not long enough for holding the expanded
4800 // pid characters, it also returns false instead of returning the partially
4801 // expanded one.
4802 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4803 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4804 char* buf, size_t buflen) {
4805 const char* p = src;
4806 char* b = buf;
4807 const char* src_end = &src[srclen];
4808 char* buf_end = &buf[buflen - 1];
4809
4810 while (p < src_end && b < buf_end) {
4811 if (*p == '%') {
4812 switch (*(++p)) {
4813 case '%': // "%%" ==> "%"
4814 *b++ = *p++;
4815 break;
4816 case 'p': { // "%p" ==> current process id
4817 // buf_end points to the character before the last character so
4818 // that we could write '\0' to the end of the buffer.
4819 size_t buf_sz = buf_end - b + 1;
4820 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4821
4822 // if jio_snprintf fails or the buffer is not long enough to hold
4823 // the expanded pid, returns false.
4824 if (ret < 0 || ret >= (int)buf_sz) {
4825 return false;
4826 } else {
4827 b += ret;
4828 assert(*b == '\0', "fail in copy_expand_pid");
4829 if (p == src_end && b == buf_end + 1) {
4830 // reach the end of the buffer.
4831 return true;
4832 }
4833 }
4834 p++;
4835 break;
4836 }
4837 default :
4838 *b++ = '%';
4839 }
4840 } else {
4841 *b++ = *p++;
4842 }
4843 }
4844 *b = '\0';
4845 return (p == src_end); // return false if not all of the source was copied
4846 }