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 size_t Arguments::_conservative_max_heap_alignment = 0;
82 size_t Arguments::_min_heap_size = 0;
83 Arguments::Mode Arguments::_mode = _mixed;
84 bool Arguments::_java_compiler = false;
85 bool Arguments::_xdebug_mode = false;
86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
88 int Arguments::_sun_java_launcher_pid = -1;
89 bool Arguments::_sun_java_launcher_is_altjvm = false;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 char* Arguments::SharedArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114
115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
116 PathString *Arguments::_system_boot_class_path = NULL;
117 bool Arguments::_has_jimage = false;
118
119 char* Arguments::_ext_dirs = NULL;
120
121 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
122 // part of the option string.
123 static bool match_option(const JavaVMOption *option, const char* name,
124 const char** tail) {
125 size_t len = strlen(name);
126 if (strncmp(option->optionString, name, len) == 0) {
127 *tail = option->optionString + len;
128 return true;
129 } else {
130 return false;
131 }
132 }
133
134 // Check if 'option' matches 'name'. No "tail" is allowed.
135 static bool match_option(const JavaVMOption *option, const char* name) {
136 const char* tail = NULL;
137 bool result = match_option(option, name, &tail);
138 if (tail != NULL && *tail == '\0') {
139 return result;
140 } else {
141 return false;
142 }
143 }
144
145 // Return true if any of the strings in null-terminated array 'names' matches.
146 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
147 // the option must match exactly.
148 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
149 bool tail_allowed) {
150 for (/* empty */; *names != NULL; ++names) {
151 if (match_option(option, *names, tail)) {
152 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
153 return true;
154 }
155 }
156 }
157 return false;
158 }
159
160 static void logOption(const char* opt) {
161 if (PrintVMOptions) {
162 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
163 }
164 }
165
166 bool needs_module_property_warning = false;
167
168 #define MODULE_PROPERTY_PREFIX "jdk.module."
169 #define MODULE_PROPERTY_PREFIX_LEN 11
170 #define ADDEXPORTS "addexports"
171 #define ADDEXPORTS_LEN 10
172 #define ADDREADS "addreads"
173 #define ADDREADS_LEN 8
174 #define ADDOPENS "addopens"
175 #define ADDOPENS_LEN 8
176 #define PATCH "patch"
177 #define PATCH_LEN 5
178 #define ADDMODS "addmods"
179 #define ADDMODS_LEN 7
180 #define LIMITMODS "limitmods"
181 #define LIMITMODS_LEN 9
182 #define PATH "path"
183 #define PATH_LEN 4
184 #define UPGRADE_PATH "upgrade.path"
185 #define UPGRADE_PATH_LEN 12
186
187 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
188 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
189 return ((strncmp(option, property, len) == 0) &&
190 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
191 }
192
193 // Return true if property starts with "jdk.module." and its ensuing chars match
194 // any of the reserved module properties.
195 // property should be passed without the leading "-D".
196 bool Arguments::is_internal_module_property(const char* property) {
197 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
198 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
199 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
200 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
201 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
202 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
203 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
204 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
205 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
206 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
207 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
208 return true;
209 }
210 }
211 return false;
212 }
213
214 // Process java launcher properties.
215 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
216 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
217 // sun.java.launcher.pid is defined.
218 // Must do this before setting up other system properties,
219 // as some of them may depend on launcher type.
220 for (int index = 0; index < args->nOptions; index++) {
221 const JavaVMOption* option = args->options + index;
222 const char* tail;
223
224 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
225 process_java_launcher_argument(tail, option->extraInfo);
226 continue;
227 }
228 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
229 if (strcmp(tail, "true") == 0) {
230 _sun_java_launcher_is_altjvm = true;
231 }
232 continue;
233 }
234 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
235 _sun_java_launcher_pid = atoi(tail);
236 continue;
237 }
238 }
239 }
240
241 // Initialize system properties key and value.
242 void Arguments::init_system_properties() {
243
244 // Set up _system_boot_class_path which is not a property but
245 // relies heavily on argument processing and the jdk.boot.class.path.append
246 // property. It is used to store the underlying system boot class path.
247 _system_boot_class_path = new PathString(NULL);
248
249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
250 "Java Virtual Machine Specification", false));
251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
253 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
254 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
255
256 // Following are JVMTI agent writable properties.
257 // Properties values are set to NULL and they are
258 // os specific they are initialized in os::init_system_properties_values().
259 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
260 _java_library_path = new SystemProperty("java.library.path", NULL, true);
261 _java_home = new SystemProperty("java.home", NULL, true);
262 _java_class_path = new SystemProperty("java.class.path", "", true);
263 // jdk.boot.class.path.append is a non-writeable, internal property.
264 // It can only be set by either:
265 // - -Xbootclasspath/a:
266 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
267 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
268
269 // Add to System Property list.
270 PropertyList_add(&_system_properties, _sun_boot_library_path);
271 PropertyList_add(&_system_properties, _java_library_path);
272 PropertyList_add(&_system_properties, _java_home);
273 PropertyList_add(&_system_properties, _java_class_path);
274 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
275
276 // Set OS specific system properties values
277 os::init_system_properties_values();
278 }
279
280 // Update/Initialize System properties after JDK version number is known
281 void Arguments::init_version_specific_system_properties() {
282 enum { bufsz = 16 };
283 char buffer[bufsz];
284 const char* spec_vendor = "Oracle Corporation";
285 uint32_t spec_version = JDK_Version::current().major_version();
286
287 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
288
289 PropertyList_add(&_system_properties,
290 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
291 PropertyList_add(&_system_properties,
292 new SystemProperty("java.vm.specification.version", buffer, false));
293 PropertyList_add(&_system_properties,
294 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
295 }
296
297 /*
298 * -XX argument processing:
299 *
300 * -XX arguments are defined in several places, such as:
301 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
302 * -XX arguments are parsed in parse_argument().
303 * -XX argument bounds checking is done in check_vm_args_consistency().
304 *
305 * Over time -XX arguments may change. There are mechanisms to handle common cases:
306 *
307 * ALIASED: An option that is simply another name for another option. This is often
308 * part of the process of deprecating a flag, but not all aliases need
309 * to be deprecated.
310 *
311 * Create an alias for an option by adding the old and new option names to the
312 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
313 *
314 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
315 * support may be removed in the future. Both regular and aliased options may be
316 * deprecated.
317 *
318 * Add a deprecation warning for an option (or alias) by adding an entry in the
319 * "special_jvm_flags" table and setting the "deprecated_in" field.
320 * Often an option "deprecated" in one major release will
321 * be made "obsolete" in the next. In this case the entry should also have its
322 * "obsolete_in" field set.
323 *
324 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
325 * on the command line. A warning is printed to let the user know that option might not
326 * be accepted in the future.
327 *
328 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
329 * table and setting the "obsolete_in" field.
330 *
331 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
332 * to the current JDK version. The system will flatly refuse to admit the existence of
333 * the flag. This allows a flag to die automatically over JDK releases.
334 *
335 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
336 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
337 * - Newly obsolete or expired deprecated options should have their global variable
338 * definitions removed (from globals.hpp, etc) and related implementations removed.
339 *
340 * Recommended approach for removing options:
341 *
342 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
343 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
344 *
345 * To remove internal options (e.g. diagnostic, experimental, develop options), use
346 * a 2-step model adding major release numbers to the obsolete and expire columns.
347 *
348 * To change the name of an option, use the alias table as well as a 2-step
349 * model adding major release numbers to the deprecate and expire columns.
350 * Think twice about aliasing commonly used customer options.
351 *
352 * There are times when it is appropriate to leave a future release number as undefined.
353 *
354 * Tests: Aliases should be tested in VMAliasOptions.java.
355 * Deprecated options should be tested in VMDeprecatedOptions.java.
356 */
357
358 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
359 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
360 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
361 // the command-line as usual, but will issue a warning.
362 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
363 // the command-line, while issuing a warning and ignoring the flag value.
364 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
365 // existence of the flag.
366 //
367 // MANUAL CLEANUP ON JDK VERSION UPDATES:
368 // This table ensures that the handling of options will update automatically when the JDK
369 // version is incremented, but the source code needs to be cleanup up manually:
370 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
371 // variable should be removed, as well as users of the variable.
372 // - As "deprecated" options age into "obsolete" options, move the entry into the
373 // "Obsolete Flags" section of the table.
374 // - All expired options should be removed from the table.
375 static SpecialFlag const special_jvm_flags[] = {
376 // -------------- Deprecated Flags --------------
377 // --- Non-alias flags - sorted by obsolete_in then expired_in:
378 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
379 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
380 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
381 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
382 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
383 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
384
385 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
386 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
387 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
388 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
389 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
390
391 // -------------- Obsolete Flags - sorted by expired_in --------------
392 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
393 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
394 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
395 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
396 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
397
398 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
399 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
400 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
401 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
402 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
403 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
404 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
405 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
406 #endif
407
408 { NULL, JDK_Version(0), JDK_Version(0) }
409 };
410
411 // Flags that are aliases for other flags.
412 typedef struct {
413 const char* alias_name;
414 const char* real_name;
415 } AliasedFlag;
416
417 static AliasedFlag const aliased_jvm_flags[] = {
418 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
419 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
420 { NULL, NULL}
421 };
422
423 // NOTE: A compatibility request will be necessary for each alias to be removed.
424 static AliasedLoggingFlag const aliased_logging_flags[] = {
425 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
426 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
427 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
428 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
429 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
430 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
431 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
432 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
433 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
434 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
435 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
436 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
437 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
438 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
439 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
440 };
441
442 #ifndef PRODUCT
443 // These options are removed in jdk9. Remove this code for jdk10.
444 static AliasedFlag const removed_develop_logging_flags[] = {
445 { "TraceClassInitialization", "-Xlog:class+init" },
446 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
447 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
448 { "TraceItables", "-Xlog:itables=debug" },
449 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
450 { "TraceSafepoint", "-Xlog:safepoint=debug" },
451 { "TraceStartupTime", "-Xlog:startuptime" },
452 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
453 { "PrintVtables", "-Xlog:vtables=debug" },
454 { "VerboseVerification", "-Xlog:verification" },
455 { NULL, NULL }
456 };
457 #endif //PRODUCT
458
459 // Return true if "v" is less than "other", where "other" may be "undefined".
460 static bool version_less_than(JDK_Version v, JDK_Version other) {
461 assert(!v.is_undefined(), "must be defined");
462 if (!other.is_undefined() && v.compare(other) >= 0) {
463 return false;
464 } else {
465 return true;
466 }
467 }
468
469 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
470
471 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
472 // Allow extensions to have priority
473 if (lookup_special_flag_ext(flag_name, flag)) {
474 return true;
475 }
476
477 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
478 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
479 flag = special_jvm_flags[i];
480 return true;
481 }
482 }
483 return false;
484 }
485
486 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
487 assert(version != NULL, "Must provide a version buffer");
488 SpecialFlag flag;
489 if (lookup_special_flag(flag_name, flag)) {
490 if (!flag.obsolete_in.is_undefined()) {
491 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
492 *version = flag.obsolete_in;
493 return true;
494 }
495 }
496 }
497 return false;
498 }
499
500 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
501 assert(version != NULL, "Must provide a version buffer");
502 SpecialFlag flag;
503 if (lookup_special_flag(flag_name, flag)) {
504 if (!flag.deprecated_in.is_undefined()) {
505 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
506 version_less_than(JDK_Version::current(), flag.expired_in)) {
507 *version = flag.deprecated_in;
508 return 1;
509 } else {
510 return -1;
511 }
512 }
513 }
514 return 0;
515 }
516
517 #ifndef PRODUCT
518 const char* Arguments::removed_develop_logging_flag_name(const char* name){
519 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
520 const AliasedFlag& flag = removed_develop_logging_flags[i];
521 if (strcmp(flag.alias_name, name) == 0) {
522 return flag.real_name;
523 }
524 }
525 return NULL;
526 }
527 #endif // PRODUCT
528
529 const char* Arguments::real_flag_name(const char *flag_name) {
530 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
531 const AliasedFlag& flag_status = aliased_jvm_flags[i];
532 if (strcmp(flag_status.alias_name, flag_name) == 0) {
533 return flag_status.real_name;
534 }
535 }
536 return flag_name;
537 }
538
539 #ifdef ASSERT
540 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
541 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
542 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
543 return true;
544 }
545 }
546 return false;
547 }
548
549 static bool verify_special_jvm_flags() {
550 bool success = true;
551 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
552 const SpecialFlag& flag = special_jvm_flags[i];
553 if (lookup_special_flag(flag.name, i)) {
554 warning("Duplicate special flag declaration \"%s\"", flag.name);
555 success = false;
556 }
557 if (flag.deprecated_in.is_undefined() &&
558 flag.obsolete_in.is_undefined()) {
559 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
560 success = false;
561 }
562
563 if (!flag.deprecated_in.is_undefined()) {
564 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
565 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
566 success = false;
567 }
568
569 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
570 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
571 success = false;
572 }
573 }
574
575 if (!flag.obsolete_in.is_undefined()) {
576 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
577 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
578 success = false;
579 }
580
581 // if flag has become obsolete it should not have a "globals" flag defined anymore.
582 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
583 if (Flag::find_flag(flag.name) != NULL) {
584 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
585 success = false;
586 }
587 }
588 }
589
590 if (!flag.expired_in.is_undefined()) {
591 // if flag has become expired it should not have a "globals" flag defined anymore.
592 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
593 if (Flag::find_flag(flag.name) != NULL) {
594 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
595 success = false;
596 }
597 }
598 }
599
600 }
601 return success;
602 }
603 #endif
604
605 // Parses a size specification string.
606 bool Arguments::atojulong(const char *s, julong* result) {
607 julong n = 0;
608
609 // First char must be a digit. Don't allow negative numbers or leading spaces.
610 if (!isdigit(*s)) {
611 return false;
612 }
613
614 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
615 char* remainder;
616 errno = 0;
617 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
618 if (errno != 0) {
619 return false;
620 }
621
622 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
623 if (remainder == s || strlen(remainder) > 1) {
624 return false;
625 }
626
627 switch (*remainder) {
628 case 'T': case 't':
629 *result = n * G * K;
630 // Check for overflow.
631 if (*result/((julong)G * K) != n) return false;
632 return true;
633 case 'G': case 'g':
634 *result = n * G;
635 if (*result/G != n) return false;
636 return true;
637 case 'M': case 'm':
638 *result = n * M;
639 if (*result/M != n) return false;
640 return true;
641 case 'K': case 'k':
642 *result = n * K;
643 if (*result/K != n) return false;
644 return true;
645 case '\0':
646 *result = n;
647 return true;
648 default:
649 return false;
650 }
651 }
652
653 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
654 if (size < min_size) return arg_too_small;
655 if (size > max_size) return arg_too_big;
656 return arg_in_range;
657 }
658
659 // Describe an argument out of range error
660 void Arguments::describe_range_error(ArgsRange errcode) {
661 switch(errcode) {
662 case arg_too_big:
663 jio_fprintf(defaultStream::error_stream(),
664 "The specified size exceeds the maximum "
665 "representable size.\n");
666 break;
667 case arg_too_small:
668 case arg_unreadable:
669 case arg_in_range:
670 // do nothing for now
671 break;
672 default:
673 ShouldNotReachHere();
674 }
675 }
676
677 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
678 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
679 return true;
680 } else {
681 return false;
682 }
683 }
684
685 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
686 char* end;
687 errno = 0;
688 double v = strtod(value, &end);
689 if ((errno != 0) || (*end != 0)) {
690 return false;
691 }
692
693 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
694 return true;
695 }
696 return false;
697 }
698
699 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
700 julong v;
701 int int_v;
702 intx intx_v;
703 bool is_neg = false;
704 Flag* result = Flag::find_flag(name, strlen(name));
705
706 if (result == NULL) {
707 return false;
708 }
709
710 // Check the sign first since atojulong() parses only unsigned values.
711 if (*value == '-') {
712 if (!result->is_intx() && !result->is_int()) {
713 return false;
714 }
715 value++;
716 is_neg = true;
717 }
718 if (!Arguments::atojulong(value, &v)) {
719 return false;
720 }
721 if (result->is_int()) {
722 int_v = (int) v;
723 if (is_neg) {
724 int_v = -int_v;
725 }
726 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
727 } else if (result->is_uint()) {
728 uint uint_v = (uint) v;
729 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
730 } else if (result->is_intx()) {
731 intx_v = (intx) v;
732 if (is_neg) {
733 intx_v = -intx_v;
734 }
735 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
736 } else if (result->is_uintx()) {
737 uintx uintx_v = (uintx) v;
738 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
739 } else if (result->is_uint64_t()) {
740 uint64_t uint64_t_v = (uint64_t) v;
741 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
742 } else if (result->is_size_t()) {
743 size_t size_t_v = (size_t) v;
744 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
745 } else if (result->is_double()) {
746 double double_v = (double) v;
747 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
748 } else {
749 return false;
750 }
751 }
752
753 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
754 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
755 // Contract: CommandLineFlags always returns a pointer that needs freeing.
756 FREE_C_HEAP_ARRAY(char, value);
757 return true;
758 }
759
760 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
761 const char* old_value = "";
762 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
763 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
764 size_t new_len = strlen(new_value);
765 const char* value;
766 char* free_this_too = NULL;
767 if (old_len == 0) {
768 value = new_value;
769 } else if (new_len == 0) {
770 value = old_value;
771 } else {
772 size_t length = old_len + 1 + new_len + 1;
773 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
774 // each new setting adds another LINE to the switch:
775 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
776 value = buf;
777 free_this_too = buf;
778 }
779 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
780 // CommandLineFlags always returns a pointer that needs freeing.
781 FREE_C_HEAP_ARRAY(char, value);
782 if (free_this_too != NULL) {
783 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
784 FREE_C_HEAP_ARRAY(char, free_this_too);
785 }
786 return true;
787 }
788
789 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
790 const char* real_name = real_flag_name(arg);
791 JDK_Version since = JDK_Version();
792 switch (is_deprecated_flag(arg, &since)) {
793 case -1:
794 return NULL; // obsolete or expired, don't process normally
795 case 0:
796 return real_name;
797 case 1: {
798 if (warn) {
799 char version[256];
800 since.to_string(version, sizeof(version));
801 if (real_name != arg) {
802 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
803 arg, version, real_name);
804 } else {
805 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
806 arg, version);
807 }
808 }
809 return real_name;
810 }
811 }
812 ShouldNotReachHere();
813 return NULL;
814 }
815
816 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
817 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
818 // Set tagset string buffer at max size of 256, large enough for any alias tagset
819 const int max_tagset_size = 256;
820 int max_tagset_len = max_tagset_size - 1;
821 char tagset_buffer[max_tagset_size];
822 tagset_buffer[0] = '\0';
823
824 // Write tag-set for aliased logging option, in string list form
825 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
826 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
827 if (i > 0) {
828 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
829 }
830 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
831 }
832 if (!alf.exactMatch) {
833 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
834 }
835 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
836 (on) ? "+" : "-",
837 name,
838 tagset_buffer,
839 (on) ? LogLevel::name(alf.level) : "off");
840 }
841
842 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
843 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
844 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
845 if (strcmp(alf.alias_name, name) == 0) {
846 log_deprecated_flag(name, on, alf);
847 return alf;
848 }
849 }
850 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
851 return a;
852 }
853
854 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
855
856 // range of acceptable characters spelled out for portability reasons
857 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
858 #define BUFLEN 255
859 char name[BUFLEN+1];
860 char dummy;
861 const char* real_name;
862 bool warn_if_deprecated = true;
863
864 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
865 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
866 if (alf.alias_name != NULL){
867 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
868 return true;
869 }
870 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
871 if (real_name == NULL) {
872 return false;
873 }
874 return set_bool_flag(real_name, false, origin);
875 }
876 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
877 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
878 if (alf.alias_name != NULL){
879 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
880 return true;
881 }
882 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
883 if (real_name == NULL) {
884 return false;
885 }
886 return set_bool_flag(real_name, true, origin);
887 }
888
889 char punct;
890 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
891 const char* value = strchr(arg, '=') + 1;
892 Flag* flag;
893
894 // this scanf pattern matches both strings (handled here) and numbers (handled later))
895 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
896 if (alf.alias_name != NULL) {
897 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
898 return true;
899 }
900 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
901 if (real_name == NULL) {
902 return false;
903 }
904 flag = Flag::find_flag(real_name);
905 if (flag != NULL && flag->is_ccstr()) {
906 if (flag->ccstr_accumulates()) {
907 return append_to_string_flag(real_name, value, origin);
908 } else {
909 if (value[0] == '\0') {
910 value = NULL;
911 }
912 return set_string_flag(real_name, value, origin);
913 }
914 } else {
915 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
916 }
917 }
918
919 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
920 const char* value = strchr(arg, '=') + 1;
921 // -XX:Foo:=xxx will reset the string flag to the given value.
922 if (value[0] == '\0') {
923 value = NULL;
924 }
925 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
926 if (real_name == NULL) {
927 return false;
928 }
929 return set_string_flag(real_name, value, origin);
930 }
931
932 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
933 #define SIGNED_NUMBER_RANGE "[-0123456789]"
934 #define NUMBER_RANGE "[0123456789eE+-]"
935 char value[BUFLEN + 1];
936 char value2[BUFLEN + 1];
937 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
938 // Looks like a floating-point number -- try again with more lenient format string
939 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
940 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
941 if (real_name == NULL) {
942 return false;
943 }
944 return set_fp_numeric_flag(real_name, value, origin);
945 }
946 }
947
948 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
949 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
950 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
951 if (real_name == NULL) {
952 return false;
953 }
954 return set_numeric_flag(real_name, value, origin);
955 }
956
957 return false;
958 }
959
960 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
961 assert(bldarray != NULL, "illegal argument");
962
963 if (arg == NULL) {
964 return;
965 }
966
967 int new_count = *count + 1;
968
969 // expand the array and add arg to the last element
970 if (*bldarray == NULL) {
971 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
972 } else {
973 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
974 }
975 (*bldarray)[*count] = os::strdup_check_oom(arg);
976 *count = new_count;
977 }
978
979 void Arguments::build_jvm_args(const char* arg) {
980 add_string(&_jvm_args_array, &_num_jvm_args, arg);
981 }
982
983 void Arguments::build_jvm_flags(const char* arg) {
984 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
985 }
986
987 // utility function to return a string that concatenates all
988 // strings in a given char** array
989 const char* Arguments::build_resource_string(char** args, int count) {
990 if (args == NULL || count == 0) {
991 return NULL;
992 }
993 size_t length = 0;
994 for (int i = 0; i < count; i++) {
995 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
996 }
997 char* s = NEW_RESOURCE_ARRAY(char, length);
998 char* dst = s;
999 for (int j = 0; j < count; j++) {
1000 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1001 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1002 dst += offset;
1003 length -= offset;
1004 }
1005 return (const char*) s;
1006 }
1007
1008 void Arguments::print_on(outputStream* st) {
1009 st->print_cr("VM Arguments:");
1010 if (num_jvm_flags() > 0) {
1011 st->print("jvm_flags: "); print_jvm_flags_on(st);
1012 st->cr();
1013 }
1014 if (num_jvm_args() > 0) {
1015 st->print("jvm_args: "); print_jvm_args_on(st);
1016 st->cr();
1017 }
1018 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1019 if (_java_class_path != NULL) {
1020 char* path = _java_class_path->value();
1021 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1022 }
1023 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1024 }
1025
1026 void Arguments::print_summary_on(outputStream* st) {
1027 // Print the command line. Environment variables that are helpful for
1028 // reproducing the problem are written later in the hs_err file.
1029 // flags are from setting file
1030 if (num_jvm_flags() > 0) {
1031 st->print_raw("Settings File: ");
1032 print_jvm_flags_on(st);
1033 st->cr();
1034 }
1035 // args are the command line and environment variable arguments.
1036 st->print_raw("Command Line: ");
1037 if (num_jvm_args() > 0) {
1038 print_jvm_args_on(st);
1039 }
1040 // this is the classfile and any arguments to the java program
1041 if (java_command() != NULL) {
1042 st->print("%s", java_command());
1043 }
1044 st->cr();
1045 }
1046
1047 void Arguments::print_jvm_flags_on(outputStream* st) {
1048 if (_num_jvm_flags > 0) {
1049 for (int i=0; i < _num_jvm_flags; i++) {
1050 st->print("%s ", _jvm_flags_array[i]);
1051 }
1052 }
1053 }
1054
1055 void Arguments::print_jvm_args_on(outputStream* st) {
1056 if (_num_jvm_args > 0) {
1057 for (int i=0; i < _num_jvm_args; i++) {
1058 st->print("%s ", _jvm_args_array[i]);
1059 }
1060 }
1061 }
1062
1063 bool Arguments::process_argument(const char* arg,
1064 jboolean ignore_unrecognized,
1065 Flag::Flags origin) {
1066 JDK_Version since = JDK_Version();
1067
1068 if (parse_argument(arg, origin)) {
1069 return true;
1070 }
1071
1072 // Determine if the flag has '+', '-', or '=' characters.
1073 bool has_plus_minus = (*arg == '+' || *arg == '-');
1074 const char* const argname = has_plus_minus ? arg + 1 : arg;
1075
1076 size_t arg_len;
1077 const char* equal_sign = strchr(argname, '=');
1078 if (equal_sign == NULL) {
1079 arg_len = strlen(argname);
1080 } else {
1081 arg_len = equal_sign - argname;
1082 }
1083
1084 // Only make the obsolete check for valid arguments.
1085 if (arg_len <= BUFLEN) {
1086 // Construct a string which consists only of the argument name without '+', '-', or '='.
1087 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1088 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1089 if (is_obsolete_flag(stripped_argname, &since)) {
1090 char version[256];
1091 since.to_string(version, sizeof(version));
1092 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1093 return true;
1094 }
1095 #ifndef PRODUCT
1096 else {
1097 const char* replacement;
1098 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1099 log_warning(arguments)("%s has been removed. Please use %s instead.",
1100 stripped_argname,
1101 replacement);
1102 return false;
1103 }
1104 }
1105 #endif //PRODUCT
1106 }
1107
1108 // For locked flags, report a custom error message if available.
1109 // Otherwise, report the standard unrecognized VM option.
1110 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1111 if (found_flag != NULL) {
1112 char locked_message_buf[BUFLEN];
1113 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1114 if (strlen(locked_message_buf) == 0) {
1115 if (found_flag->is_bool() && !has_plus_minus) {
1116 jio_fprintf(defaultStream::error_stream(),
1117 "Missing +/- setting for VM option '%s'\n", argname);
1118 } else if (!found_flag->is_bool() && has_plus_minus) {
1119 jio_fprintf(defaultStream::error_stream(),
1120 "Unexpected +/- setting in VM option '%s'\n", argname);
1121 } else {
1122 jio_fprintf(defaultStream::error_stream(),
1123 "Improperly specified VM option '%s'\n", argname);
1124 }
1125 } else {
1126 #ifdef PRODUCT
1127 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1128 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1129 if (ignore_unrecognized && mismatched) {
1130 return true;
1131 }
1132 #endif
1133 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1134 }
1135 } else {
1136 if (ignore_unrecognized) {
1137 return true;
1138 }
1139 jio_fprintf(defaultStream::error_stream(),
1140 "Unrecognized VM option '%s'\n", argname);
1141 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1142 if (fuzzy_matched != NULL) {
1143 jio_fprintf(defaultStream::error_stream(),
1144 "Did you mean '%s%s%s'? ",
1145 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1146 fuzzy_matched->_name,
1147 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1148 }
1149 }
1150
1151 // allow for commandline "commenting out" options like -XX:#+Verbose
1152 return arg[0] == '#';
1153 }
1154
1155 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1156 FILE* stream = fopen(file_name, "rb");
1157 if (stream == NULL) {
1158 if (should_exist) {
1159 jio_fprintf(defaultStream::error_stream(),
1160 "Could not open settings file %s\n", file_name);
1161 return false;
1162 } else {
1163 return true;
1164 }
1165 }
1166
1167 char token[1024];
1168 int pos = 0;
1169
1170 bool in_white_space = true;
1171 bool in_comment = false;
1172 bool in_quote = false;
1173 char quote_c = 0;
1174 bool result = true;
1175
1176 int c = getc(stream);
1177 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1178 if (in_white_space) {
1179 if (in_comment) {
1180 if (c == '\n') in_comment = false;
1181 } else {
1182 if (c == '#') in_comment = true;
1183 else if (!isspace(c)) {
1184 in_white_space = false;
1185 token[pos++] = c;
1186 }
1187 }
1188 } else {
1189 if (c == '\n' || (!in_quote && isspace(c))) {
1190 // token ends at newline, or at unquoted whitespace
1191 // this allows a way to include spaces in string-valued options
1192 token[pos] = '\0';
1193 logOption(token);
1194 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1195 build_jvm_flags(token);
1196 pos = 0;
1197 in_white_space = true;
1198 in_quote = false;
1199 } else if (!in_quote && (c == '\'' || c == '"')) {
1200 in_quote = true;
1201 quote_c = c;
1202 } else if (in_quote && (c == quote_c)) {
1203 in_quote = false;
1204 } else {
1205 token[pos++] = c;
1206 }
1207 }
1208 c = getc(stream);
1209 }
1210 if (pos > 0) {
1211 token[pos] = '\0';
1212 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1213 build_jvm_flags(token);
1214 }
1215 fclose(stream);
1216 return result;
1217 }
1218
1219 //=============================================================================================================
1220 // Parsing of properties (-D)
1221
1222 const char* Arguments::get_property(const char* key) {
1223 return PropertyList_get_value(system_properties(), key);
1224 }
1225
1226 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1227 const char* eq = strchr(prop, '=');
1228 const char* key;
1229 const char* value = "";
1230
1231 if (eq == NULL) {
1232 // property doesn't have a value, thus use passed string
1233 key = prop;
1234 } else {
1235 // property have a value, thus extract it and save to the
1236 // allocated string
1237 size_t key_len = eq - prop;
1238 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1239
1240 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1241 key = tmp_key;
1242
1243 value = &prop[key_len + 1];
1244 }
1245
1246 if (strcmp(key, "java.compiler") == 0) {
1247 process_java_compiler_argument(value);
1248 // Record value in Arguments, but let it get passed to Java.
1249 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1250 strcmp(key, "sun.java.launcher.pid") == 0) {
1251 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1252 // private and are processed in process_sun_java_launcher_properties();
1253 // the sun.java.launcher property is passed on to the java application
1254 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1255 // append is true, writable is true, internal is false
1256 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1257 WriteableProperty, ExternalProperty);
1258 } else {
1259 if (strcmp(key, "sun.java.command") == 0) {
1260 char *old_java_command = _java_command;
1261 _java_command = os::strdup_check_oom(value, mtArguments);
1262 if (old_java_command != NULL) {
1263 os::free(old_java_command);
1264 }
1265 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1266 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1267 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1268 // its value without going through the property list or making a Java call.
1269 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1270 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1271 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1272 os::free((void *)old_java_vendor_url_bug);
1273 }
1274 }
1275
1276 // Create new property and add at the end of the list
1277 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1278 }
1279
1280 if (key != prop) {
1281 // SystemProperty copy passed value, thus free previously allocated
1282 // memory
1283 FreeHeap((void *)key);
1284 }
1285
1286 return true;
1287 }
1288
1289 #if INCLUDE_CDS
1290 void Arguments::check_unsupported_dumping_properties() {
1291 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1292 const char* unsupported_properties[] = { "jdk.module.main",
1293 "jdk.module.limitmods",
1294 "jdk.module.path",
1295 "jdk.module.upgrade.path",
1296 "jdk.module.patch.0" };
1297 const char* unsupported_options[] = { "-m", // cannot use at dump time
1298 "--limit-modules", // ignored at dump time
1299 "--module-path", // ignored at dump time
1300 "--upgrade-module-path", // 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 // Convert deprecated flags
2073 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
2074 !FLAG_IS_DEFAULT(MaxRAMFraction))
2075 MaxRAMPercentage = 100.0 / MaxRAMFraction;
2076
2077 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
2078 !FLAG_IS_DEFAULT(MinRAMFraction))
2079 MinRAMPercentage = 100.0 / MinRAMFraction;
2080
2081 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
2082 !FLAG_IS_DEFAULT(InitialRAMFraction))
2083 InitialRAMPercentage = 100.0 / InitialRAMFraction;
2084
2085 // If the maximum heap size has not been set with -Xmx,
2086 // then set it as fraction of the size of physical memory,
2087 // respecting the maximum and minimum sizes of the heap.
2088 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2089 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
2090 if (phys_mem <= (julong)((MaxHeapSize * MinRAMPercentage) / 100)) {
2091 // Small physical memory, so use a minimum fraction of it for the heap
2092 reasonable_max = (julong)((phys_mem * MinRAMPercentage) / 100);
2093 } else {
2094 // Not-small physical memory, so require a heap at least
2095 // as large as MaxHeapSize
2096 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2097 }
2098
2099 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2100 // Limit the heap size to ErgoHeapSizeLimit
2101 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2102 }
2103 if (UseCompressedOops) {
2104 // Limit the heap size to the maximum possible when using compressed oops
2105 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2106
2107 // HeapBaseMinAddress can be greater than default but not less than.
2108 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2109 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2110 // matches compressed oops printing flags
2111 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2112 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2113 DefaultHeapBaseMinAddress,
2114 DefaultHeapBaseMinAddress/G,
2115 HeapBaseMinAddress);
2116 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2117 }
2118 }
2119
2120 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2121 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2122 // but it should be not less than default MaxHeapSize.
2123 max_coop_heap -= HeapBaseMinAddress;
2124 }
2125 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2126 }
2127 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2128
2129 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2130 // An initial heap size was specified on the command line,
2131 // so be sure that the maximum size is consistent. Done
2132 // after call to limit_by_allocatable_memory because that
2133 // method might reduce the allocation size.
2134 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2135 }
2136
2137 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2138 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2139 }
2140
2141 // If the minimum or initial heap_size have not been set or requested to be set
2142 // ergonomically, set them accordingly.
2143 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2144 julong reasonable_minimum = (julong)(OldSize + NewSize);
2145
2146 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2147
2148 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2149
2150 if (InitialHeapSize == 0) {
2151 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
2152
2153 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2154 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2155
2156 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2157
2158 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2159 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2160 }
2161 // If the minimum heap size has not been set (via -Xms),
2162 // synchronize with InitialHeapSize to avoid errors with the default value.
2163 if (min_heap_size() == 0) {
2164 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2165 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2166 }
2167 }
2168 }
2169
2170 // This option inspects the machine and attempts to set various
2171 // parameters to be optimal for long-running, memory allocation
2172 // intensive jobs. It is intended for machines with large
2173 // amounts of cpu and memory.
2174 jint Arguments::set_aggressive_heap_flags() {
2175 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2176 // VM, but we may not be able to represent the total physical memory
2177 // available (like having 8gb of memory on a box but using a 32bit VM).
2178 // Thus, we need to make sure we're using a julong for intermediate
2179 // calculations.
2180 julong initHeapSize;
2181 julong total_memory = os::physical_memory();
2182
2183 if (total_memory < (julong) 256 * M) {
2184 jio_fprintf(defaultStream::error_stream(),
2185 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2186 vm_exit(1);
2187 }
2188
2189 // The heap size is half of available memory, or (at most)
2190 // all of possible memory less 160mb (leaving room for the OS
2191 // when using ISM). This is the maximum; because adaptive sizing
2192 // is turned on below, the actual space used may be smaller.
2193
2194 initHeapSize = MIN2(total_memory / (julong) 2,
2195 total_memory - (julong) 160 * M);
2196
2197 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2198
2199 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2200 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2201 return JNI_EINVAL;
2202 }
2203 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2204 return JNI_EINVAL;
2205 }
2206 // Currently the minimum size and the initial heap sizes are the same.
2207 set_min_heap_size(initHeapSize);
2208 }
2209 if (FLAG_IS_DEFAULT(NewSize)) {
2210 // Make the young generation 3/8ths of the total heap.
2211 if (FLAG_SET_CMDLINE(size_t, NewSize,
2212 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2213 return JNI_EINVAL;
2214 }
2215 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2216 return JNI_EINVAL;
2217 }
2218 }
2219
2220 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2221 FLAG_SET_DEFAULT(UseLargePages, true);
2222 #endif
2223
2224 // Increase some data structure sizes for efficiency
2225 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2226 return JNI_EINVAL;
2227 }
2228 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2229 return JNI_EINVAL;
2230 }
2231 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2232 return JNI_EINVAL;
2233 }
2234
2235 // See the OldPLABSize comment below, but replace 'after promotion'
2236 // with 'after copying'. YoungPLABSize is the size of the survivor
2237 // space per-gc-thread buffers. The default is 4kw.
2238 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2239 return JNI_EINVAL;
2240 }
2241
2242 // OldPLABSize is the size of the buffers in the old gen that
2243 // UseParallelGC uses to promote live data that doesn't fit in the
2244 // survivor spaces. At any given time, there's one for each gc thread.
2245 // The default size is 1kw. These buffers are rarely used, since the
2246 // survivor spaces are usually big enough. For specjbb, however, there
2247 // are occasions when there's lots of live data in the young gen
2248 // and we end up promoting some of it. We don't have a definite
2249 // explanation for why bumping OldPLABSize helps, but the theory
2250 // is that a bigger PLAB results in retaining something like the
2251 // original allocation order after promotion, which improves mutator
2252 // locality. A minor effect may be that larger PLABs reduce the
2253 // number of PLAB allocation events during gc. The value of 8kw
2254 // was arrived at by experimenting with specjbb.
2255 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2256 return JNI_EINVAL;
2257 }
2258
2259 // Enable parallel GC and adaptive generation sizing
2260 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2261 return JNI_EINVAL;
2262 }
2263
2264 // Encourage steady state memory management
2265 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2266 return JNI_EINVAL;
2267 }
2268
2269 // This appears to improve mutator locality
2270 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2271 return JNI_EINVAL;
2272 }
2273
2274 // Get around early Solaris scheduling bug
2275 // (affinity vs other jobs on system)
2276 // but disallow DR and offlining (5008695).
2277 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2278 return JNI_EINVAL;
2279 }
2280
2281 return JNI_OK;
2282 }
2283
2284 // This must be called after ergonomics.
2285 void Arguments::set_bytecode_flags() {
2286 if (!RewriteBytecodes) {
2287 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2288 }
2289 }
2290
2291 // Aggressive optimization flags -XX:+AggressiveOpts
2292 jint Arguments::set_aggressive_opts_flags() {
2293 #ifdef COMPILER2
2294 if (AggressiveUnboxing) {
2295 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2296 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2297 } else if (!EliminateAutoBox) {
2298 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2299 AggressiveUnboxing = false;
2300 }
2301 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2302 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2303 } else if (!DoEscapeAnalysis) {
2304 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2305 AggressiveUnboxing = false;
2306 }
2307 }
2308 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2309 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2310 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2311 }
2312 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2313 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2314 }
2315
2316 // Feed the cache size setting into the JDK
2317 char buffer[1024];
2318 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2319 if (!add_property(buffer)) {
2320 return JNI_ENOMEM;
2321 }
2322 }
2323 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2324 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2325 }
2326 #endif
2327
2328 if (AggressiveOpts) {
2329 // Sample flag setting code
2330 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2331 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2332 // }
2333 }
2334
2335 return JNI_OK;
2336 }
2337
2338 //===========================================================================================================
2339 // Parsing of java.compiler property
2340
2341 void Arguments::process_java_compiler_argument(const char* arg) {
2342 // For backwards compatibility, Djava.compiler=NONE or ""
2343 // causes us to switch to -Xint mode UNLESS -Xdebug
2344 // is also specified.
2345 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2346 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2347 }
2348 }
2349
2350 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2351 _sun_java_launcher = os::strdup_check_oom(launcher);
2352 }
2353
2354 bool Arguments::created_by_java_launcher() {
2355 assert(_sun_java_launcher != NULL, "property must have value");
2356 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2357 }
2358
2359 bool Arguments::sun_java_launcher_is_altjvm() {
2360 return _sun_java_launcher_is_altjvm;
2361 }
2362
2363 //===========================================================================================================
2364 // Parsing of main arguments
2365
2366 #if INCLUDE_JVMCI
2367 // Check consistency of jvmci vm argument settings.
2368 bool Arguments::check_jvmci_args_consistency() {
2369 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2370 }
2371 #endif //INCLUDE_JVMCI
2372
2373 // Check consistency of GC selection
2374 bool Arguments::check_gc_consistency() {
2375 // Ensure that the user has not selected conflicting sets
2376 // of collectors.
2377 uint i = 0;
2378 if (UseSerialGC) i++;
2379 if (UseConcMarkSweepGC) i++;
2380 if (UseParallelGC || UseParallelOldGC) i++;
2381 if (UseG1GC) i++;
2382 if (i > 1) {
2383 jio_fprintf(defaultStream::error_stream(),
2384 "Conflicting collector combinations in option list; "
2385 "please refer to the release notes for the combinations "
2386 "allowed\n");
2387 return false;
2388 }
2389
2390 return true;
2391 }
2392
2393 // Check the consistency of vm_init_args
2394 bool Arguments::check_vm_args_consistency() {
2395 // Method for adding checks for flag consistency.
2396 // The intent is to warn the user of all possible conflicts,
2397 // before returning an error.
2398 // Note: Needs platform-dependent factoring.
2399 bool status = true;
2400
2401 if (TLABRefillWasteFraction == 0) {
2402 jio_fprintf(defaultStream::error_stream(),
2403 "TLABRefillWasteFraction should be a denominator, "
2404 "not " SIZE_FORMAT "\n",
2405 TLABRefillWasteFraction);
2406 status = false;
2407 }
2408
2409 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2410 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2411 }
2412
2413 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2414 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2415 }
2416
2417 if (GCTimeLimit == 100) {
2418 // Turn off gc-overhead-limit-exceeded checks
2419 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2420 }
2421
2422 status = status && check_gc_consistency();
2423
2424 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2425 // insists that we hold the requisite locks so that the iteration is
2426 // MT-safe. For the verification at start-up and shut-down, we don't
2427 // yet have a good way of acquiring and releasing these locks,
2428 // which are not visible at the CollectedHeap level. We want to
2429 // be able to acquire these locks and then do the iteration rather
2430 // than just disable the lock verification. This will be fixed under
2431 // bug 4788986.
2432 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2433 if (VerifyDuringStartup) {
2434 warning("Heap verification at start-up disabled "
2435 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2436 VerifyDuringStartup = false; // Disable verification at start-up
2437 }
2438
2439 if (VerifyBeforeExit) {
2440 warning("Heap verification at shutdown disabled "
2441 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2442 VerifyBeforeExit = false; // Disable verification at shutdown
2443 }
2444 }
2445
2446 if (PrintNMTStatistics) {
2447 #if INCLUDE_NMT
2448 if (MemTracker::tracking_level() == NMT_off) {
2449 #endif // INCLUDE_NMT
2450 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2451 PrintNMTStatistics = false;
2452 #if INCLUDE_NMT
2453 }
2454 #endif
2455 }
2456
2457 #if INCLUDE_JVMCI
2458 status = status && check_jvmci_args_consistency();
2459
2460 if (EnableJVMCI) {
2461 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2462 AddProperty, UnwriteableProperty, InternalProperty);
2463
2464 if (!ScavengeRootsInCode) {
2465 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2466 ScavengeRootsInCode = 1;
2467 }
2468 }
2469 #endif
2470
2471 // Check lower bounds of the code cache
2472 // Template Interpreter code is approximately 3X larger in debug builds.
2473 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2474 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2477 os::vm_page_size()/K);
2478 status = false;
2479 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2480 jio_fprintf(defaultStream::error_stream(),
2481 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2482 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2483 status = false;
2484 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2485 jio_fprintf(defaultStream::error_stream(),
2486 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2487 min_code_cache_size/K);
2488 status = false;
2489 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2490 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2491 jio_fprintf(defaultStream::error_stream(),
2492 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2493 CODE_CACHE_SIZE_LIMIT/M);
2494 status = false;
2495 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2496 jio_fprintf(defaultStream::error_stream(),
2497 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2498 min_code_cache_size/K);
2499 status = false;
2500 }
2501
2502 #ifdef _LP64
2503 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2504 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2505 }
2506 #endif
2507
2508 #ifndef SUPPORT_RESERVED_STACK_AREA
2509 if (StackReservedPages != 0) {
2510 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2511 warning("Reserved Stack Area not supported on this platform");
2512 }
2513 #endif
2514
2515 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2516 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2517 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2518 }
2519 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2520 }
2521 if (UseCompiler && is_interpreter_only()) {
2522 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2523 warning("UseCompiler disabled due to -Xint.");
2524 }
2525 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2526 }
2527 #ifdef COMPILER2
2528 if (PostLoopMultiversioning && !RangeCheckElimination) {
2529 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2530 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2531 }
2532 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2533 }
2534 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2535 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2536 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2537 }
2538 LoopStripMiningIter = 1;
2539 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2540 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2541 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2542 }
2543 LoopStripMiningIter = 0;
2544 }
2545 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
2546 // blind guess
2547 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
2548 }
2549 #endif
2550 return status;
2551 }
2552
2553 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2554 const char* option_type) {
2555 if (ignore) return false;
2556
2557 const char* spacer = " ";
2558 if (option_type == NULL) {
2559 option_type = ++spacer; // Set both to the empty string.
2560 }
2561
2562 if (os::obsolete_option(option)) {
2563 jio_fprintf(defaultStream::error_stream(),
2564 "Obsolete %s%soption: %s\n", option_type, spacer,
2565 option->optionString);
2566 return false;
2567 } else {
2568 jio_fprintf(defaultStream::error_stream(),
2569 "Unrecognized %s%soption: %s\n", option_type, spacer,
2570 option->optionString);
2571 return true;
2572 }
2573 }
2574
2575 static const char* user_assertion_options[] = {
2576 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2577 };
2578
2579 static const char* system_assertion_options[] = {
2580 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2581 };
2582
2583 bool Arguments::parse_uintx(const char* value,
2584 uintx* uintx_arg,
2585 uintx min_size) {
2586
2587 // Check the sign first since atojulong() parses only unsigned values.
2588 bool value_is_positive = !(*value == '-');
2589
2590 if (value_is_positive) {
2591 julong n;
2592 bool good_return = atojulong(value, &n);
2593 if (good_return) {
2594 bool above_minimum = n >= min_size;
2595 bool value_is_too_large = n > max_uintx;
2596
2597 if (above_minimum && !value_is_too_large) {
2598 *uintx_arg = n;
2599 return true;
2600 }
2601 }
2602 }
2603 return false;
2604 }
2605
2606 unsigned int addreads_count = 0;
2607 unsigned int addexports_count = 0;
2608 unsigned int addopens_count = 0;
2609 unsigned int addmods_count = 0;
2610 unsigned int patch_mod_count = 0;
2611
2612 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2613 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2614 char* property = AllocateHeap(prop_len, mtArguments);
2615 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2616 if (ret < 0 || ret >= (int)prop_len) {
2617 FreeHeap(property);
2618 return false;
2619 }
2620 bool added = add_property(property, UnwriteableProperty, internal);
2621 FreeHeap(property);
2622 return added;
2623 }
2624
2625 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2626 const unsigned int props_count_limit = 1000;
2627 const int max_digits = 3;
2628 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2629
2630 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2631 if (count < props_count_limit) {
2632 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2633 char* property = AllocateHeap(prop_len, mtArguments);
2634 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2635 if (ret < 0 || ret >= (int)prop_len) {
2636 FreeHeap(property);
2637 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2638 return false;
2639 }
2640 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2641 FreeHeap(property);
2642 return added;
2643 }
2644
2645 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2646 return false;
2647 }
2648
2649 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2650 julong* long_arg,
2651 julong min_size,
2652 julong max_size) {
2653 if (!atojulong(s, long_arg)) return arg_unreadable;
2654 return check_memory_size(*long_arg, min_size, max_size);
2655 }
2656
2657 // Parse JavaVMInitArgs structure
2658
2659 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2660 const JavaVMInitArgs *java_options_args,
2661 const JavaVMInitArgs *cmd_line_args) {
2662 bool patch_mod_javabase = false;
2663
2664 // Save default settings for some mode flags
2665 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2666 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2667 Arguments::_ClipInlining = ClipInlining;
2668 Arguments::_BackgroundCompilation = BackgroundCompilation;
2669 if (TieredCompilation) {
2670 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2671 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2672 }
2673
2674 // Setup flags for mixed which is the default
2675 set_mode_flags(_mixed);
2676
2677 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2678 // variable (if present).
2679 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2680 if (result != JNI_OK) {
2681 return result;
2682 }
2683
2684 // Parse args structure generated from the command line flags.
2685 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2686 if (result != JNI_OK) {
2687 return result;
2688 }
2689
2690 // Parse args structure generated from the _JAVA_OPTIONS environment
2691 // variable (if present) (mimics classic VM)
2692 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2693 if (result != JNI_OK) {
2694 return result;
2695 }
2696
2697 // Do final processing now that all arguments have been parsed
2698 result = finalize_vm_init_args(patch_mod_javabase);
2699 if (result != JNI_OK) {
2700 return result;
2701 }
2702
2703 return JNI_OK;
2704 }
2705
2706 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2707 // represents a valid JDWP agent. is_path==true denotes that we
2708 // are dealing with -agentpath (case where name is a path), otherwise with
2709 // -agentlib
2710 bool valid_jdwp_agent(char *name, bool is_path) {
2711 char *_name;
2712 const char *_jdwp = "jdwp";
2713 size_t _len_jdwp, _len_prefix;
2714
2715 if (is_path) {
2716 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2717 return false;
2718 }
2719
2720 _name++; // skip past last path separator
2721 _len_prefix = strlen(JNI_LIB_PREFIX);
2722
2723 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2724 return false;
2725 }
2726
2727 _name += _len_prefix;
2728 _len_jdwp = strlen(_jdwp);
2729
2730 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2731 _name += _len_jdwp;
2732 }
2733 else {
2734 return false;
2735 }
2736
2737 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2738 return false;
2739 }
2740
2741 return true;
2742 }
2743
2744 if (strcmp(name, _jdwp) == 0) {
2745 return true;
2746 }
2747
2748 return false;
2749 }
2750
2751 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2752 // --patch-module=<module>=<file>(<pathsep><file>)*
2753 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2754 // Find the equal sign between the module name and the path specification
2755 const char* module_equal = strchr(patch_mod_tail, '=');
2756 if (module_equal == NULL) {
2757 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2758 return JNI_ERR;
2759 } else {
2760 // Pick out the module name
2761 size_t module_len = module_equal - patch_mod_tail;
2762 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2763 if (module_name != NULL) {
2764 memcpy(module_name, patch_mod_tail, module_len);
2765 *(module_name + module_len) = '\0';
2766 // The path piece begins one past the module_equal sign
2767 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2768 FREE_C_HEAP_ARRAY(char, module_name);
2769 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2770 return JNI_ENOMEM;
2771 }
2772 } else {
2773 return JNI_ENOMEM;
2774 }
2775 }
2776 return JNI_OK;
2777 }
2778
2779 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2780 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2781 // The min and max sizes match the values in globals.hpp, but scaled
2782 // with K. The values have been chosen so that alignment with page
2783 // size doesn't change the max value, which makes the conversions
2784 // back and forth between Xss value and ThreadStackSize value easier.
2785 // The values have also been chosen to fit inside a 32-bit signed type.
2786 const julong min_ThreadStackSize = 0;
2787 const julong max_ThreadStackSize = 1 * M;
2788
2789 const julong min_size = min_ThreadStackSize * K;
2790 const julong max_size = max_ThreadStackSize * K;
2791
2792 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2793
2794 julong size = 0;
2795 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2796 if (errcode != arg_in_range) {
2797 bool silent = (option == NULL); // Allow testing to silence error messages
2798 if (!silent) {
2799 jio_fprintf(defaultStream::error_stream(),
2800 "Invalid thread stack size: %s\n", option->optionString);
2801 describe_range_error(errcode);
2802 }
2803 return JNI_EINVAL;
2804 }
2805
2806 // Internally track ThreadStackSize in units of 1024 bytes.
2807 const julong size_aligned = align_up(size, K);
2808 assert(size <= size_aligned,
2809 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2810 size, size_aligned);
2811
2812 const julong size_in_K = size_aligned / K;
2813 assert(size_in_K < (julong)max_intx,
2814 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2815 size_in_K);
2816
2817 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2818 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2819 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2820 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2821 max_expanded, size_in_K);
2822
2823 *out_ThreadStackSize = (intx)size_in_K;
2824
2825 return JNI_OK;
2826 }
2827
2828 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2829 // For match_option to return remaining or value part of option string
2830 const char* tail;
2831
2832 // iterate over arguments
2833 for (int index = 0; index < args->nOptions; index++) {
2834 bool is_absolute_path = false; // for -agentpath vs -agentlib
2835
2836 const JavaVMOption* option = args->options + index;
2837
2838 if (!match_option(option, "-Djava.class.path", &tail) &&
2839 !match_option(option, "-Dsun.java.command", &tail) &&
2840 !match_option(option, "-Dsun.java.launcher", &tail)) {
2841
2842 // add all jvm options to the jvm_args string. This string
2843 // is used later to set the java.vm.args PerfData string constant.
2844 // the -Djava.class.path and the -Dsun.java.command options are
2845 // omitted from jvm_args string as each have their own PerfData
2846 // string constant object.
2847 build_jvm_args(option->optionString);
2848 }
2849
2850 // -verbose:[class/module/gc/jni]
2851 if (match_option(option, "-verbose", &tail)) {
2852 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2853 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2854 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2855 } else if (!strcmp(tail, ":module")) {
2856 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2857 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2858 } else if (!strcmp(tail, ":gc")) {
2859 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2860 } else if (!strcmp(tail, ":jni")) {
2861 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2862 return JNI_EINVAL;
2863 }
2864 }
2865 // -da / -ea / -disableassertions / -enableassertions
2866 // These accept an optional class/package name separated by a colon, e.g.,
2867 // -da:java.lang.Thread.
2868 } else if (match_option(option, user_assertion_options, &tail, true)) {
2869 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2870 if (*tail == '\0') {
2871 JavaAssertions::setUserClassDefault(enable);
2872 } else {
2873 assert(*tail == ':', "bogus match by match_option()");
2874 JavaAssertions::addOption(tail + 1, enable);
2875 }
2876 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2877 } else if (match_option(option, system_assertion_options, &tail, false)) {
2878 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2879 JavaAssertions::setSystemClassDefault(enable);
2880 // -bootclasspath:
2881 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2882 jio_fprintf(defaultStream::output_stream(),
2883 "-Xbootclasspath is no longer a supported option.\n");
2884 return JNI_EINVAL;
2885 // -bootclasspath/a:
2886 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2887 Arguments::append_sysclasspath(tail);
2888 // -bootclasspath/p:
2889 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2890 jio_fprintf(defaultStream::output_stream(),
2891 "-Xbootclasspath/p is no longer a supported option.\n");
2892 return JNI_EINVAL;
2893 // -Xrun
2894 } else if (match_option(option, "-Xrun", &tail)) {
2895 if (tail != NULL) {
2896 const char* pos = strchr(tail, ':');
2897 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2898 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2899 jio_snprintf(name, len + 1, "%s", tail);
2900
2901 char *options = NULL;
2902 if(pos != NULL) {
2903 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2904 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2905 }
2906 #if !INCLUDE_JVMTI
2907 if (strcmp(name, "jdwp") == 0) {
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Debugging agents are not supported in this VM\n");
2910 return JNI_ERR;
2911 }
2912 #endif // !INCLUDE_JVMTI
2913 add_init_library(name, options);
2914 }
2915 } else if (match_option(option, "--add-reads=", &tail)) {
2916 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2917 return JNI_ENOMEM;
2918 }
2919 } else if (match_option(option, "--add-exports=", &tail)) {
2920 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2921 return JNI_ENOMEM;
2922 }
2923 } else if (match_option(option, "--add-opens=", &tail)) {
2924 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2925 return JNI_ENOMEM;
2926 }
2927 } else if (match_option(option, "--add-modules=", &tail)) {
2928 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2929 return JNI_ENOMEM;
2930 }
2931 } else if (match_option(option, "--limit-modules=", &tail)) {
2932 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2933 return JNI_ENOMEM;
2934 }
2935 } else if (match_option(option, "--module-path=", &tail)) {
2936 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2937 return JNI_ENOMEM;
2938 }
2939 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2940 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2941 return JNI_ENOMEM;
2942 }
2943 } else if (match_option(option, "--patch-module=", &tail)) {
2944 // --patch-module=<module>=<file>(<pathsep><file>)*
2945 int res = process_patch_mod_option(tail, patch_mod_javabase);
2946 if (res != JNI_OK) {
2947 return res;
2948 }
2949 } else if (match_option(option, "--illegal-access=", &tail)) {
2950 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2951 return JNI_ENOMEM;
2952 }
2953 // -agentlib and -agentpath
2954 } else if (match_option(option, "-agentlib:", &tail) ||
2955 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2956 if(tail != NULL) {
2957 const char* pos = strchr(tail, '=');
2958 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2959 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2960 name[len] = '\0';
2961
2962 char *options = NULL;
2963 if(pos != NULL) {
2964 options = os::strdup_check_oom(pos + 1, mtArguments);
2965 }
2966 #if !INCLUDE_JVMTI
2967 if (valid_jdwp_agent(name, is_absolute_path)) {
2968 jio_fprintf(defaultStream::error_stream(),
2969 "Debugging agents are not supported in this VM\n");
2970 return JNI_ERR;
2971 }
2972 #endif // !INCLUDE_JVMTI
2973 add_init_agent(name, options, is_absolute_path);
2974 }
2975 // -javaagent
2976 } else if (match_option(option, "-javaagent:", &tail)) {
2977 #if !INCLUDE_JVMTI
2978 jio_fprintf(defaultStream::error_stream(),
2979 "Instrumentation agents are not supported in this VM\n");
2980 return JNI_ERR;
2981 #else
2982 if (tail != NULL) {
2983 size_t length = strlen(tail) + 1;
2984 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2985 jio_snprintf(options, length, "%s", tail);
2986 add_init_agent("instrument", options, false);
2987 // java agents need module java.instrument
2988 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2989 return JNI_ENOMEM;
2990 }
2991 }
2992 #endif // !INCLUDE_JVMTI
2993 // -Xnoclassgc
2994 } else if (match_option(option, "-Xnoclassgc")) {
2995 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2996 return JNI_EINVAL;
2997 }
2998 // -Xconcgc
2999 } else if (match_option(option, "-Xconcgc")) {
3000 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
3004 // -Xnoconcgc
3005 } else if (match_option(option, "-Xnoconcgc")) {
3006 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
3007 return JNI_EINVAL;
3008 }
3009 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
3010 // -Xbatch
3011 } else if (match_option(option, "-Xbatch")) {
3012 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 // -Xmn for compatibility with other JVM vendors
3016 } else if (match_option(option, "-Xmn", &tail)) {
3017 julong long_initial_young_size = 0;
3018 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
3019 if (errcode != arg_in_range) {
3020 jio_fprintf(defaultStream::error_stream(),
3021 "Invalid initial young generation size: %s\n", option->optionString);
3022 describe_range_error(errcode);
3023 return JNI_EINVAL;
3024 }
3025 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3026 return JNI_EINVAL;
3027 }
3028 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3029 return JNI_EINVAL;
3030 }
3031 // -Xms
3032 } else if (match_option(option, "-Xms", &tail)) {
3033 julong long_initial_heap_size = 0;
3034 // an initial heap size of 0 means automatically determine
3035 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3036 if (errcode != arg_in_range) {
3037 jio_fprintf(defaultStream::error_stream(),
3038 "Invalid initial heap size: %s\n", option->optionString);
3039 describe_range_error(errcode);
3040 return JNI_EINVAL;
3041 }
3042 set_min_heap_size((size_t)long_initial_heap_size);
3043 // Currently the minimum size and the initial heap sizes are the same.
3044 // Can be overridden with -XX:InitialHeapSize.
3045 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 // -Xmx
3049 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3050 julong long_max_heap_size = 0;
3051 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3052 if (errcode != arg_in_range) {
3053 jio_fprintf(defaultStream::error_stream(),
3054 "Invalid maximum heap size: %s\n", option->optionString);
3055 describe_range_error(errcode);
3056 return JNI_EINVAL;
3057 }
3058 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
3059 return JNI_EINVAL;
3060 }
3061 // Xmaxf
3062 } else if (match_option(option, "-Xmaxf", &tail)) {
3063 char* err;
3064 int maxf = (int)(strtod(tail, &err) * 100);
3065 if (*err != '\0' || *tail == '\0') {
3066 jio_fprintf(defaultStream::error_stream(),
3067 "Bad max heap free percentage size: %s\n",
3068 option->optionString);
3069 return JNI_EINVAL;
3070 } else {
3071 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 }
3075 // Xminf
3076 } else if (match_option(option, "-Xminf", &tail)) {
3077 char* err;
3078 int minf = (int)(strtod(tail, &err) * 100);
3079 if (*err != '\0' || *tail == '\0') {
3080 jio_fprintf(defaultStream::error_stream(),
3081 "Bad min heap free percentage size: %s\n",
3082 option->optionString);
3083 return JNI_EINVAL;
3084 } else {
3085 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3086 return JNI_EINVAL;
3087 }
3088 }
3089 // -Xss
3090 } else if (match_option(option, "-Xss", &tail)) {
3091 intx value = 0;
3092 jint err = parse_xss(option, tail, &value);
3093 if (err != JNI_OK) {
3094 return err;
3095 }
3096 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
3097 return JNI_EINVAL;
3098 }
3099 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3100 julong long_CodeCacheExpansionSize = 0;
3101 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3102 if (errcode != arg_in_range) {
3103 jio_fprintf(defaultStream::error_stream(),
3104 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3105 os::vm_page_size()/K);
3106 return JNI_EINVAL;
3107 }
3108 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3109 return JNI_EINVAL;
3110 }
3111 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3112 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3113 julong long_ReservedCodeCacheSize = 0;
3114
3115 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3116 if (errcode != arg_in_range) {
3117 jio_fprintf(defaultStream::error_stream(),
3118 "Invalid maximum code cache size: %s.\n", option->optionString);
3119 return JNI_EINVAL;
3120 }
3121 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 // -XX:NonNMethodCodeHeapSize=
3125 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3126 julong long_NonNMethodCodeHeapSize = 0;
3127
3128 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3129 if (errcode != arg_in_range) {
3130 jio_fprintf(defaultStream::error_stream(),
3131 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3132 return JNI_EINVAL;
3133 }
3134 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3135 return JNI_EINVAL;
3136 }
3137 // -XX:ProfiledCodeHeapSize=
3138 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3139 julong long_ProfiledCodeHeapSize = 0;
3140
3141 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3142 if (errcode != arg_in_range) {
3143 jio_fprintf(defaultStream::error_stream(),
3144 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3145 return JNI_EINVAL;
3146 }
3147 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3148 return JNI_EINVAL;
3149 }
3150 // -XX:NonProfiledCodeHeapSizee=
3151 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3152 julong long_NonProfiledCodeHeapSize = 0;
3153
3154 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3155 if (errcode != arg_in_range) {
3156 jio_fprintf(defaultStream::error_stream(),
3157 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3158 return JNI_EINVAL;
3159 }
3160 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3161 return JNI_EINVAL;
3162 }
3163 // -green
3164 } else if (match_option(option, "-green")) {
3165 jio_fprintf(defaultStream::error_stream(),
3166 "Green threads support not available\n");
3167 return JNI_EINVAL;
3168 // -native
3169 } else if (match_option(option, "-native")) {
3170 // HotSpot always uses native threads, ignore silently for compatibility
3171 // -Xrs
3172 } else if (match_option(option, "-Xrs")) {
3173 // Classic/EVM option, new functionality
3174 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3175 return JNI_EINVAL;
3176 }
3177 // -Xprof
3178 } else if (match_option(option, "-Xprof")) {
3179 char version[256];
3180 // Obsolete in JDK 10
3181 JDK_Version::jdk(10).to_string(version, sizeof(version));
3182 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3183 // -Xconcurrentio
3184 } else if (match_option(option, "-Xconcurrentio")) {
3185 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3189 return JNI_EINVAL;
3190 }
3191 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3198 return JNI_EINVAL;
3199 }
3200
3201 // -Xinternalversion
3202 } else if (match_option(option, "-Xinternalversion")) {
3203 jio_fprintf(defaultStream::output_stream(), "%s\n",
3204 VM_Version::internal_vm_info_string());
3205 vm_exit(0);
3206 #ifndef PRODUCT
3207 // -Xprintflags
3208 } else if (match_option(option, "-Xprintflags")) {
3209 CommandLineFlags::printFlags(tty, false);
3210 vm_exit(0);
3211 #endif
3212 // -D
3213 } else if (match_option(option, "-D", &tail)) {
3214 const char* value;
3215 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3216 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3217 // abort if -Djava.endorsed.dirs is set
3218 jio_fprintf(defaultStream::output_stream(),
3219 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3220 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3221 return JNI_EINVAL;
3222 }
3223 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3224 *value != '\0' && strcmp(value, "\"\"") != 0) {
3225 // abort if -Djava.ext.dirs is set
3226 jio_fprintf(defaultStream::output_stream(),
3227 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3228 return JNI_EINVAL;
3229 }
3230 // Check for module related properties. They must be set using the modules
3231 // options. For example: use "--add-modules=java.sql", not
3232 // "-Djdk.module.addmods=java.sql"
3233 if (is_internal_module_property(option->optionString + 2)) {
3234 needs_module_property_warning = true;
3235 continue;
3236 }
3237
3238 if (!add_property(tail)) {
3239 return JNI_ENOMEM;
3240 }
3241 // Out of the box management support
3242 if (match_option(option, "-Dcom.sun.management", &tail)) {
3243 #if INCLUDE_MANAGEMENT
3244 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3245 return JNI_EINVAL;
3246 }
3247 // management agent in module jdk.management.agent
3248 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3249 return JNI_ENOMEM;
3250 }
3251 #else
3252 jio_fprintf(defaultStream::output_stream(),
3253 "-Dcom.sun.management is not supported in this VM.\n");
3254 return JNI_ERR;
3255 #endif
3256 }
3257 // -Xint
3258 } else if (match_option(option, "-Xint")) {
3259 set_mode_flags(_int);
3260 // -Xmixed
3261 } else if (match_option(option, "-Xmixed")) {
3262 set_mode_flags(_mixed);
3263 // -Xcomp
3264 } else if (match_option(option, "-Xcomp")) {
3265 // for testing the compiler; turn off all flags that inhibit compilation
3266 set_mode_flags(_comp);
3267 // -Xshare:dump
3268 } else if (match_option(option, "-Xshare:dump")) {
3269 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3270 return JNI_EINVAL;
3271 }
3272 set_mode_flags(_int); // Prevent compilation, which creates objects
3273 // -Xshare:on
3274 } else if (match_option(option, "-Xshare:on")) {
3275 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3276 return JNI_EINVAL;
3277 }
3278 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3279 return JNI_EINVAL;
3280 }
3281 // -Xshare:auto
3282 } else if (match_option(option, "-Xshare:auto")) {
3283 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3284 return JNI_EINVAL;
3285 }
3286 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3287 return JNI_EINVAL;
3288 }
3289 // -Xshare:off
3290 } else if (match_option(option, "-Xshare:off")) {
3291 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3292 return JNI_EINVAL;
3293 }
3294 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3295 return JNI_EINVAL;
3296 }
3297 // -Xverify
3298 } else if (match_option(option, "-Xverify", &tail)) {
3299 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3300 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3301 return JNI_EINVAL;
3302 }
3303 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3304 return JNI_EINVAL;
3305 }
3306 } else if (strcmp(tail, ":remote") == 0) {
3307 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3308 return JNI_EINVAL;
3309 }
3310 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3311 return JNI_EINVAL;
3312 }
3313 } else if (strcmp(tail, ":none") == 0) {
3314 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3315 return JNI_EINVAL;
3316 }
3317 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3318 return JNI_EINVAL;
3319 }
3320 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3321 return JNI_EINVAL;
3322 }
3323 // -Xdebug
3324 } else if (match_option(option, "-Xdebug")) {
3325 // note this flag has been used, then ignore
3326 set_xdebug_mode(true);
3327 // -Xnoagent
3328 } else if (match_option(option, "-Xnoagent")) {
3329 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3330 } else if (match_option(option, "-Xloggc:", &tail)) {
3331 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3332 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3333 _gc_log_filename = os::strdup_check_oom(tail);
3334 } else if (match_option(option, "-Xlog", &tail)) {
3335 bool ret = false;
3336 if (strcmp(tail, ":help") == 0) {
3337 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3338 vm_exit(0);
3339 } else if (strcmp(tail, ":disable") == 0) {
3340 LogConfiguration::disable_logging();
3341 ret = true;
3342 } else if (*tail == '\0') {
3343 ret = LogConfiguration::parse_command_line_arguments();
3344 assert(ret, "-Xlog without arguments should never fail to parse");
3345 } else if (*tail == ':') {
3346 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3347 }
3348 if (ret == false) {
3349 jio_fprintf(defaultStream::error_stream(),
3350 "Invalid -Xlog option '-Xlog%s'\n",
3351 tail);
3352 return JNI_EINVAL;
3353 }
3354 // JNI hooks
3355 } else if (match_option(option, "-Xcheck", &tail)) {
3356 if (!strcmp(tail, ":jni")) {
3357 #if !INCLUDE_JNI_CHECK
3358 warning("JNI CHECKING is not supported in this VM");
3359 #else
3360 CheckJNICalls = true;
3361 #endif // INCLUDE_JNI_CHECK
3362 } else if (is_bad_option(option, args->ignoreUnrecognized,
3363 "check")) {
3364 return JNI_EINVAL;
3365 }
3366 } else if (match_option(option, "vfprintf")) {
3367 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3368 } else if (match_option(option, "exit")) {
3369 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3370 } else if (match_option(option, "abort")) {
3371 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3372 // -XX:+AggressiveHeap
3373 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3374 jint result = set_aggressive_heap_flags();
3375 if (result != JNI_OK) {
3376 return result;
3377 }
3378 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3379 // and the last option wins.
3380 } else if (match_option(option, "-XX:+NeverTenure")) {
3381 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3382 return JNI_EINVAL;
3383 }
3384 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3385 return JNI_EINVAL;
3386 }
3387 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3388 return JNI_EINVAL;
3389 }
3390 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3391 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3392 return JNI_EINVAL;
3393 }
3394 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3395 return JNI_EINVAL;
3396 }
3397 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3398 return JNI_EINVAL;
3399 }
3400 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3401 uintx max_tenuring_thresh = 0;
3402 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3403 jio_fprintf(defaultStream::error_stream(),
3404 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3405 return JNI_EINVAL;
3406 }
3407
3408 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3409 return JNI_EINVAL;
3410 }
3411
3412 if (MaxTenuringThreshold == 0) {
3413 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3414 return JNI_EINVAL;
3415 }
3416 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3417 return JNI_EINVAL;
3418 }
3419 } else {
3420 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3421 return JNI_EINVAL;
3422 }
3423 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3424 return JNI_EINVAL;
3425 }
3426 }
3427 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3428 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3429 return JNI_EINVAL;
3430 }
3431 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3432 return JNI_EINVAL;
3433 }
3434 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3435 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3436 return JNI_EINVAL;
3437 }
3438 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3439 return JNI_EINVAL;
3440 }
3441 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3442 #if defined(DTRACE_ENABLED)
3443 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3444 return JNI_EINVAL;
3445 }
3446 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3447 return JNI_EINVAL;
3448 }
3449 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3450 return JNI_EINVAL;
3451 }
3452 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3453 return JNI_EINVAL;
3454 }
3455 #else // defined(DTRACE_ENABLED)
3456 jio_fprintf(defaultStream::error_stream(),
3457 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3458 return JNI_EINVAL;
3459 #endif // defined(DTRACE_ENABLED)
3460 #ifdef ASSERT
3461 } else if (match_option(option, "-XX:+FullGCALot")) {
3462 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3463 return JNI_EINVAL;
3464 }
3465 // disable scavenge before parallel mark-compact
3466 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3467 return JNI_EINVAL;
3468 }
3469 #endif
3470 #if !INCLUDE_MANAGEMENT
3471 } else if (match_option(option, "-XX:+ManagementServer")) {
3472 jio_fprintf(defaultStream::error_stream(),
3473 "ManagementServer is not supported in this VM.\n");
3474 return JNI_ERR;
3475 #endif // INCLUDE_MANAGEMENT
3476 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3477 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3478 // already been handled
3479 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3480 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3481 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3482 return JNI_EINVAL;
3483 }
3484 }
3485 // Unknown option
3486 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3487 return JNI_ERR;
3488 }
3489 }
3490
3491 // PrintSharedArchiveAndExit will turn on
3492 // -Xshare:on
3493 // -Xlog:class+path=info
3494 if (PrintSharedArchiveAndExit) {
3495 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3496 return JNI_EINVAL;
3497 }
3498 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3499 return JNI_EINVAL;
3500 }
3501 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3502 }
3503
3504 // Change the default value for flags which have different default values
3505 // when working with older JDKs.
3506 #ifdef LINUX
3507 if (JDK_Version::current().compare_major(6) <= 0 &&
3508 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3509 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3510 }
3511 #endif // LINUX
3512 fix_appclasspath();
3513 return JNI_OK;
3514 }
3515
3516 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3517 // For java.base check for duplicate --patch-module options being specified on the command line.
3518 // This check is only required for java.base, all other duplicate module specifications
3519 // will be checked during module system initialization. The module system initialization
3520 // will throw an ExceptionInInitializerError if this situation occurs.
3521 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3522 if (*patch_mod_javabase) {
3523 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3524 } else {
3525 *patch_mod_javabase = true;
3526 }
3527 }
3528
3529 // Create GrowableArray lazily, only if --patch-module has been specified
3530 if (_patch_mod_prefix == NULL) {
3531 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3532 }
3533
3534 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3535 }
3536
3537 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3538 //
3539 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3540 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3541 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3542 // path is treated as the current directory.
3543 //
3544 // This causes problems with CDS, which requires that all directories specified in the classpath
3545 // must be empty. In most cases, applications do NOT want to load classes from the current
3546 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3547 // scripts compatible with CDS.
3548 void Arguments::fix_appclasspath() {
3549 if (IgnoreEmptyClassPaths) {
3550 const char separator = *os::path_separator();
3551 const char* src = _java_class_path->value();
3552
3553 // skip over all the leading empty paths
3554 while (*src == separator) {
3555 src ++;
3556 }
3557
3558 char* copy = os::strdup_check_oom(src, mtArguments);
3559
3560 // trim all trailing empty paths
3561 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3562 *tail = '\0';
3563 }
3564
3565 char from[3] = {separator, separator, '\0'};
3566 char to [2] = {separator, '\0'};
3567 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3568 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3569 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3570 }
3571
3572 _java_class_path->set_writeable_value(copy);
3573 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3574 }
3575 }
3576
3577 static bool has_jar_files(const char* directory) {
3578 DIR* dir = os::opendir(directory);
3579 if (dir == NULL) return false;
3580
3581 struct dirent *entry;
3582 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3583 bool hasJarFile = false;
3584 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3585 const char* name = entry->d_name;
3586 const char* ext = name + strlen(name) - 4;
3587 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3588 }
3589 FREE_C_HEAP_ARRAY(char, dbuf);
3590 os::closedir(dir);
3591 return hasJarFile ;
3592 }
3593
3594 static int check_non_empty_dirs(const char* path) {
3595 const char separator = *os::path_separator();
3596 const char* const end = path + strlen(path);
3597 int nonEmptyDirs = 0;
3598 while (path < end) {
3599 const char* tmp_end = strchr(path, separator);
3600 if (tmp_end == NULL) {
3601 if (has_jar_files(path)) {
3602 nonEmptyDirs++;
3603 jio_fprintf(defaultStream::output_stream(),
3604 "Non-empty directory: %s\n", path);
3605 }
3606 path = end;
3607 } else {
3608 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3609 memcpy(dirpath, path, tmp_end - path);
3610 dirpath[tmp_end - path] = '\0';
3611 if (has_jar_files(dirpath)) {
3612 nonEmptyDirs++;
3613 jio_fprintf(defaultStream::output_stream(),
3614 "Non-empty directory: %s\n", dirpath);
3615 }
3616 FREE_C_HEAP_ARRAY(char, dirpath);
3617 path = tmp_end + 1;
3618 }
3619 }
3620 return nonEmptyDirs;
3621 }
3622
3623 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3624 // check if the default lib/endorsed directory exists; if so, error
3625 char path[JVM_MAXPATHLEN];
3626 const char* fileSep = os::file_separator();
3627 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3628
3629 if (CheckEndorsedAndExtDirs) {
3630 int nonEmptyDirs = 0;
3631 // check endorsed directory
3632 nonEmptyDirs += check_non_empty_dirs(path);
3633 // check the extension directories
3634 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3635 if (nonEmptyDirs > 0) {
3636 return JNI_ERR;
3637 }
3638 }
3639
3640 DIR* dir = os::opendir(path);
3641 if (dir != NULL) {
3642 jio_fprintf(defaultStream::output_stream(),
3643 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3644 "in modular form will be supported via the concept of upgradeable modules.\n");
3645 os::closedir(dir);
3646 return JNI_ERR;
3647 }
3648
3649 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3650 dir = os::opendir(path);
3651 if (dir != NULL) {
3652 jio_fprintf(defaultStream::output_stream(),
3653 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3654 "Use -classpath instead.\n.");
3655 os::closedir(dir);
3656 return JNI_ERR;
3657 }
3658
3659 // This must be done after all arguments have been processed.
3660 // java_compiler() true means set to "NONE" or empty.
3661 if (java_compiler() && !xdebug_mode()) {
3662 // For backwards compatibility, we switch to interpreted mode if
3663 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3664 // not specified.
3665 set_mode_flags(_int);
3666 }
3667
3668 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3669 // but like -Xint, leave compilation thresholds unaffected.
3670 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3671 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3672 set_mode_flags(_int);
3673 }
3674
3675 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3676 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3677 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3678 }
3679
3680 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3681 // Don't degrade server performance for footprint
3682 if (FLAG_IS_DEFAULT(UseLargePages) &&
3683 MaxHeapSize < LargePageHeapSizeThreshold) {
3684 // No need for large granularity pages w/small heaps.
3685 // Note that large pages are enabled/disabled for both the
3686 // Java heap and the code cache.
3687 FLAG_SET_DEFAULT(UseLargePages, false);
3688 }
3689
3690 #elif defined(COMPILER2)
3691 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3692 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3693 }
3694 #endif
3695
3696 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3697 UNSUPPORTED_OPTION(ProfileInterpreter);
3698 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3699 #endif
3700
3701 #ifndef TIERED
3702 // Tiered compilation is undefined.
3703 UNSUPPORTED_OPTION(TieredCompilation);
3704 #endif
3705
3706 #if INCLUDE_JVMCI
3707 if (EnableJVMCI &&
3708 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3709 return JNI_ENOMEM;
3710 }
3711 #endif
3712
3713 // If we are running in a headless jre, force java.awt.headless property
3714 // to be true unless the property has already been set.
3715 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3716 if (os::is_headless_jre()) {
3717 const char* headless = Arguments::get_property("java.awt.headless");
3718 if (headless == NULL) {
3719 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3720 if (headless_env == NULL) {
3721 if (!add_property("java.awt.headless=true")) {
3722 return JNI_ENOMEM;
3723 }
3724 } else {
3725 char buffer[256];
3726 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3727 if (!add_property(buffer)) {
3728 return JNI_ENOMEM;
3729 }
3730 }
3731 }
3732 }
3733
3734 if (!check_vm_args_consistency()) {
3735 return JNI_ERR;
3736 }
3737
3738 #if INCLUDE_JVMCI
3739 if (UseJVMCICompiler) {
3740 Compilation_mode = CompMode_server;
3741 }
3742 #endif
3743
3744 #if INCLUDE_CDS
3745 if (DumpSharedSpaces) {
3746 // Disable biased locking now as it interferes with the clean up of
3747 // the archived Klasses and Java string objects (at dump time only).
3748 UseBiasedLocking = false;
3749 }
3750 if (UseSharedSpaces && patch_mod_javabase) {
3751 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3752 }
3753 #endif
3754
3755 return JNI_OK;
3756 }
3757
3758 // Helper class for controlling the lifetime of JavaVMInitArgs
3759 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3760 // deleted on the destruction of the ScopedVMInitArgs object.
3761 class ScopedVMInitArgs : public StackObj {
3762 private:
3763 JavaVMInitArgs _args;
3764 char* _container_name;
3765 bool _is_set;
3766 char* _vm_options_file_arg;
3767
3768 public:
3769 ScopedVMInitArgs(const char *container_name) {
3770 _args.version = JNI_VERSION_1_2;
3771 _args.nOptions = 0;
3772 _args.options = NULL;
3773 _args.ignoreUnrecognized = false;
3774 _container_name = (char *)container_name;
3775 _is_set = false;
3776 _vm_options_file_arg = NULL;
3777 }
3778
3779 // Populates the JavaVMInitArgs object represented by this
3780 // ScopedVMInitArgs object with the arguments in options. The
3781 // allocated memory is deleted by the destructor. If this method
3782 // returns anything other than JNI_OK, then this object is in a
3783 // partially constructed state, and should be abandoned.
3784 jint set_args(GrowableArray<JavaVMOption>* options) {
3785 _is_set = true;
3786 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3787 JavaVMOption, options->length(), mtArguments);
3788 if (options_arr == NULL) {
3789 return JNI_ENOMEM;
3790 }
3791 _args.options = options_arr;
3792
3793 for (int i = 0; i < options->length(); i++) {
3794 options_arr[i] = options->at(i);
3795 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3796 if (options_arr[i].optionString == NULL) {
3797 // Rely on the destructor to do cleanup.
3798 _args.nOptions = i;
3799 return JNI_ENOMEM;
3800 }
3801 }
3802
3803 _args.nOptions = options->length();
3804 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3805 return JNI_OK;
3806 }
3807
3808 JavaVMInitArgs* get() { return &_args; }
3809 char* container_name() { return _container_name; }
3810 bool is_set() { return _is_set; }
3811 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3812 char* vm_options_file_arg() { return _vm_options_file_arg; }
3813
3814 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3815 if (_vm_options_file_arg != NULL) {
3816 os::free(_vm_options_file_arg);
3817 }
3818 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3819 }
3820
3821 ~ScopedVMInitArgs() {
3822 if (_vm_options_file_arg != NULL) {
3823 os::free(_vm_options_file_arg);
3824 }
3825 if (_args.options == NULL) return;
3826 for (int i = 0; i < _args.nOptions; i++) {
3827 os::free(_args.options[i].optionString);
3828 }
3829 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3830 }
3831
3832 // Insert options into this option list, to replace option at
3833 // vm_options_file_pos (-XX:VMOptionsFile)
3834 jint insert(const JavaVMInitArgs* args,
3835 const JavaVMInitArgs* args_to_insert,
3836 const int vm_options_file_pos) {
3837 assert(_args.options == NULL, "shouldn't be set yet");
3838 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3839 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3840
3841 int length = args->nOptions + args_to_insert->nOptions - 1;
3842 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3843 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3844 for (int i = 0; i < args->nOptions; i++) {
3845 if (i == vm_options_file_pos) {
3846 // insert the new options starting at the same place as the
3847 // -XX:VMOptionsFile option
3848 for (int j = 0; j < args_to_insert->nOptions; j++) {
3849 options->push(args_to_insert->options[j]);
3850 }
3851 } else {
3852 options->push(args->options[i]);
3853 }
3854 }
3855 // make into options array
3856 jint result = set_args(options);
3857 delete options;
3858 return result;
3859 }
3860 };
3861
3862 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3863 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3864 }
3865
3866 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3867 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3868 }
3869
3870 jint Arguments::parse_options_environment_variable(const char* name,
3871 ScopedVMInitArgs* vm_args) {
3872 char *buffer = ::getenv(name);
3873
3874 // Don't check this environment variable if user has special privileges
3875 // (e.g. unix su command).
3876 if (buffer == NULL || os::have_special_privileges()) {
3877 return JNI_OK;
3878 }
3879
3880 if ((buffer = os::strdup(buffer)) == NULL) {
3881 return JNI_ENOMEM;
3882 }
3883
3884 jio_fprintf(defaultStream::error_stream(),
3885 "Picked up %s: %s\n", name, buffer);
3886
3887 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3888
3889 os::free(buffer);
3890 return retcode;
3891 }
3892
3893 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3894 // read file into buffer
3895 int fd = ::open(file_name, O_RDONLY);
3896 if (fd < 0) {
3897 jio_fprintf(defaultStream::error_stream(),
3898 "Could not open options file '%s'\n",
3899 file_name);
3900 return JNI_ERR;
3901 }
3902
3903 struct stat stbuf;
3904 int retcode = os::stat(file_name, &stbuf);
3905 if (retcode != 0) {
3906 jio_fprintf(defaultStream::error_stream(),
3907 "Could not stat options file '%s'\n",
3908 file_name);
3909 os::close(fd);
3910 return JNI_ERR;
3911 }
3912
3913 if (stbuf.st_size == 0) {
3914 // tell caller there is no option data and that is ok
3915 os::close(fd);
3916 return JNI_OK;
3917 }
3918
3919 // '+ 1' for NULL termination even with max bytes
3920 size_t bytes_alloc = stbuf.st_size + 1;
3921
3922 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3923 if (NULL == buf) {
3924 jio_fprintf(defaultStream::error_stream(),
3925 "Could not allocate read buffer for options file parse\n");
3926 os::close(fd);
3927 return JNI_ENOMEM;
3928 }
3929
3930 memset(buf, 0, bytes_alloc);
3931
3932 // Fill buffer
3933 // Use ::read() instead of os::read because os::read()
3934 // might do a thread state transition
3935 // and it is too early for that here
3936
3937 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3938 os::close(fd);
3939 if (bytes_read < 0) {
3940 FREE_C_HEAP_ARRAY(char, buf);
3941 jio_fprintf(defaultStream::error_stream(),
3942 "Could not read options file '%s'\n", file_name);
3943 return JNI_ERR;
3944 }
3945
3946 if (bytes_read == 0) {
3947 // tell caller there is no option data and that is ok
3948 FREE_C_HEAP_ARRAY(char, buf);
3949 return JNI_OK;
3950 }
3951
3952 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3953
3954 FREE_C_HEAP_ARRAY(char, buf);
3955 return retcode;
3956 }
3957
3958 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3959 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3960
3961 // some pointers to help with parsing
3962 char *buffer_end = buffer + buf_len;
3963 char *opt_hd = buffer;
3964 char *wrt = buffer;
3965 char *rd = buffer;
3966
3967 // parse all options
3968 while (rd < buffer_end) {
3969 // skip leading white space from the input string
3970 while (rd < buffer_end && isspace(*rd)) {
3971 rd++;
3972 }
3973
3974 if (rd >= buffer_end) {
3975 break;
3976 }
3977
3978 // Remember this is where we found the head of the token.
3979 opt_hd = wrt;
3980
3981 // Tokens are strings of non white space characters separated
3982 // by one or more white spaces.
3983 while (rd < buffer_end && !isspace(*rd)) {
3984 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3985 int quote = *rd; // matching quote to look for
3986 rd++; // don't copy open quote
3987 while (rd < buffer_end && *rd != quote) {
3988 // include everything (even spaces)
3989 // up until the close quote
3990 *wrt++ = *rd++; // copy to option string
3991 }
3992
3993 if (rd < buffer_end) {
3994 rd++; // don't copy close quote
3995 } else {
3996 // did not see closing quote
3997 jio_fprintf(defaultStream::error_stream(),
3998 "Unmatched quote in %s\n", name);
3999 delete options;
4000 return JNI_ERR;
4001 }
4002 } else {
4003 *wrt++ = *rd++; // copy to option string
4004 }
4005 }
4006
4007 // steal a white space character and set it to NULL
4008 *wrt++ = '\0';
4009 // We now have a complete token
4010
4011 JavaVMOption option;
4012 option.optionString = opt_hd;
4013 option.extraInfo = NULL;
4014
4015 options->append(option); // Fill in option
4016
4017 rd++; // Advance to next character
4018 }
4019
4020 // Fill out JavaVMInitArgs structure.
4021 jint status = vm_args->set_args(options);
4022
4023 delete options;
4024 return status;
4025 }
4026
4027 void Arguments::set_shared_spaces_flags() {
4028 if (DumpSharedSpaces) {
4029 if (FailOverToOldVerifier) {
4030 // Don't fall back to the old verifier on verification failure. If a
4031 // class fails verification with the split verifier, it might fail the
4032 // CDS runtime verifier constraint check. In that case, we don't want
4033 // to share the class. We only archive classes that pass the split verifier.
4034 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
4035 }
4036
4037 if (RequireSharedSpaces) {
4038 warning("Cannot dump shared archive while using shared archive");
4039 }
4040 UseSharedSpaces = false;
4041 #ifdef _LP64
4042 if (!UseCompressedOops || !UseCompressedClassPointers) {
4043 vm_exit_during_initialization(
4044 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4045 }
4046 } else {
4047 if (!UseCompressedOops || !UseCompressedClassPointers) {
4048 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4049 }
4050 #endif
4051 }
4052 }
4053
4054 // Sharing support
4055 // Construct the path to the archive
4056 static char* get_shared_archive_path() {
4057 char *shared_archive_path;
4058 if (SharedArchiveFile == NULL) {
4059 char jvm_path[JVM_MAXPATHLEN];
4060 os::jvm_path(jvm_path, sizeof(jvm_path));
4061 char *end = strrchr(jvm_path, *os::file_separator());
4062 if (end != NULL) *end = '\0';
4063 size_t jvm_path_len = strlen(jvm_path);
4064 size_t file_sep_len = strlen(os::file_separator());
4065 const size_t len = jvm_path_len + file_sep_len + 20;
4066 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4067 if (shared_archive_path != NULL) {
4068 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4069 jvm_path, os::file_separator());
4070 }
4071 } else {
4072 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4073 }
4074 return shared_archive_path;
4075 }
4076
4077 #ifndef PRODUCT
4078 // Determine whether LogVMOutput should be implicitly turned on.
4079 static bool use_vm_log() {
4080 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4081 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4082 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4083 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4084 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4085 return true;
4086 }
4087
4088 #ifdef COMPILER1
4089 if (PrintC1Statistics) {
4090 return true;
4091 }
4092 #endif // COMPILER1
4093
4094 #ifdef COMPILER2
4095 if (PrintOptoAssembly || PrintOptoStatistics) {
4096 return true;
4097 }
4098 #endif // COMPILER2
4099
4100 return false;
4101 }
4102
4103 #endif // PRODUCT
4104
4105 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4106 for (int index = 0; index < args->nOptions; index++) {
4107 const JavaVMOption* option = args->options + index;
4108 const char* tail;
4109 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4110 return true;
4111 }
4112 }
4113 return false;
4114 }
4115
4116 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4117 const char* vm_options_file,
4118 const int vm_options_file_pos,
4119 ScopedVMInitArgs* vm_options_file_args,
4120 ScopedVMInitArgs* args_out) {
4121 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4122 if (code != JNI_OK) {
4123 return code;
4124 }
4125
4126 if (vm_options_file_args->get()->nOptions < 1) {
4127 return JNI_OK;
4128 }
4129
4130 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4131 jio_fprintf(defaultStream::error_stream(),
4132 "A VM options file may not refer to a VM options file. "
4133 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4134 "options file '%s' in options container '%s' is an error.\n",
4135 vm_options_file_args->vm_options_file_arg(),
4136 vm_options_file_args->container_name());
4137 return JNI_EINVAL;
4138 }
4139
4140 return args_out->insert(args, vm_options_file_args->get(),
4141 vm_options_file_pos);
4142 }
4143
4144 // Expand -XX:VMOptionsFile found in args_in as needed.
4145 // mod_args and args_out parameters may return values as needed.
4146 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4147 ScopedVMInitArgs* mod_args,
4148 JavaVMInitArgs** args_out) {
4149 jint code = match_special_option_and_act(args_in, mod_args);
4150 if (code != JNI_OK) {
4151 return code;
4152 }
4153
4154 if (mod_args->is_set()) {
4155 // args_in contains -XX:VMOptionsFile and mod_args contains the
4156 // original options from args_in along with the options expanded
4157 // from the VMOptionsFile. Return a short-hand to the caller.
4158 *args_out = mod_args->get();
4159 } else {
4160 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4161 }
4162 return JNI_OK;
4163 }
4164
4165 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4166 ScopedVMInitArgs* args_out) {
4167 // Remaining part of option string
4168 const char* tail;
4169 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4170
4171 for (int index = 0; index < args->nOptions; index++) {
4172 const JavaVMOption* option = args->options + index;
4173 if (ArgumentsExt::process_options(option)) {
4174 continue;
4175 }
4176 if (match_option(option, "-XX:Flags=", &tail)) {
4177 Arguments::set_jvm_flags_file(tail);
4178 continue;
4179 }
4180 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4181 if (vm_options_file_args.found_vm_options_file_arg()) {
4182 jio_fprintf(defaultStream::error_stream(),
4183 "The option '%s' is already specified in the options "
4184 "container '%s' so the specification of '%s' in the "
4185 "same options container is an error.\n",
4186 vm_options_file_args.vm_options_file_arg(),
4187 vm_options_file_args.container_name(),
4188 option->optionString);
4189 return JNI_EINVAL;
4190 }
4191 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4192 // If there's a VMOptionsFile, parse that
4193 jint code = insert_vm_options_file(args, tail, index,
4194 &vm_options_file_args, args_out);
4195 if (code != JNI_OK) {
4196 return code;
4197 }
4198 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4199 if (args_out->is_set()) {
4200 // The VMOptions file inserted some options so switch 'args'
4201 // to the new set of options, and continue processing which
4202 // preserves "last option wins" semantics.
4203 args = args_out->get();
4204 // The first option from the VMOptionsFile replaces the
4205 // current option. So we back track to process the
4206 // replacement option.
4207 index--;
4208 }
4209 continue;
4210 }
4211 if (match_option(option, "-XX:+PrintVMOptions")) {
4212 PrintVMOptions = true;
4213 continue;
4214 }
4215 if (match_option(option, "-XX:-PrintVMOptions")) {
4216 PrintVMOptions = false;
4217 continue;
4218 }
4219 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4220 IgnoreUnrecognizedVMOptions = true;
4221 continue;
4222 }
4223 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4224 IgnoreUnrecognizedVMOptions = false;
4225 continue;
4226 }
4227 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4228 CommandLineFlags::printFlags(tty, false);
4229 vm_exit(0);
4230 }
4231 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4232 #if INCLUDE_NMT
4233 // The launcher did not setup nmt environment variable properly.
4234 if (!MemTracker::check_launcher_nmt_support(tail)) {
4235 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4236 }
4237
4238 // Verify if nmt option is valid.
4239 if (MemTracker::verify_nmt_option()) {
4240 // Late initialization, still in single-threaded mode.
4241 if (MemTracker::tracking_level() >= NMT_summary) {
4242 MemTracker::init();
4243 }
4244 } else {
4245 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4246 }
4247 continue;
4248 #else
4249 jio_fprintf(defaultStream::error_stream(),
4250 "Native Memory Tracking is not supported in this VM\n");
4251 return JNI_ERR;
4252 #endif
4253 }
4254
4255 #ifndef PRODUCT
4256 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4257 CommandLineFlags::printFlags(tty, true);
4258 vm_exit(0);
4259 }
4260 #endif
4261 }
4262 return JNI_OK;
4263 }
4264
4265 static void print_options(const JavaVMInitArgs *args) {
4266 const char* tail;
4267 for (int index = 0; index < args->nOptions; index++) {
4268 const JavaVMOption *option = args->options + index;
4269 if (match_option(option, "-XX:", &tail)) {
4270 logOption(tail);
4271 }
4272 }
4273 }
4274
4275 bool Arguments::handle_deprecated_print_gc_flags() {
4276 if (PrintGC) {
4277 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4278 }
4279 if (PrintGCDetails) {
4280 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4281 }
4282
4283 if (_gc_log_filename != NULL) {
4284 // -Xloggc was used to specify a filename
4285 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4286
4287 LogTarget(Error, logging) target;
4288 LogStream errstream(target);
4289 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4290 } else if (PrintGC || PrintGCDetails) {
4291 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4292 }
4293 return true;
4294 }
4295
4296 void Arguments::handle_extra_cms_flags(const char* msg) {
4297 SpecialFlag flag;
4298 const char *flag_name = "UseConcMarkSweepGC";
4299 if (lookup_special_flag(flag_name, flag)) {
4300 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4301 warning("%s", msg);
4302 }
4303 }
4304
4305 // Parse entry point called from JNI_CreateJavaVM
4306
4307 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4308 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4309
4310 // Initialize ranges, constraints and writeables
4311 CommandLineFlagRangeList::init();
4312 CommandLineFlagConstraintList::init();
4313 CommandLineFlagWriteableList::init();
4314
4315 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4316 const char* hotspotrc = ".hotspotrc";
4317 bool settings_file_specified = false;
4318 bool needs_hotspotrc_warning = false;
4319 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4320 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4321
4322 // Pointers to current working set of containers
4323 JavaVMInitArgs* cur_cmd_args;
4324 JavaVMInitArgs* cur_java_options_args;
4325 JavaVMInitArgs* cur_java_tool_options_args;
4326
4327 // Containers for modified/expanded options
4328 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4329 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4330 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4331
4332
4333 jint code =
4334 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4335 if (code != JNI_OK) {
4336 return code;
4337 }
4338
4339 code = parse_java_options_environment_variable(&initial_java_options_args);
4340 if (code != JNI_OK) {
4341 return code;
4342 }
4343
4344 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4345 &mod_java_tool_options_args,
4346 &cur_java_tool_options_args);
4347 if (code != JNI_OK) {
4348 return code;
4349 }
4350
4351 code = expand_vm_options_as_needed(initial_cmd_args,
4352 &mod_cmd_args,
4353 &cur_cmd_args);
4354 if (code != JNI_OK) {
4355 return code;
4356 }
4357
4358 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4359 &mod_java_options_args,
4360 &cur_java_options_args);
4361 if (code != JNI_OK) {
4362 return code;
4363 }
4364
4365 const char* flags_file = Arguments::get_jvm_flags_file();
4366 settings_file_specified = (flags_file != NULL);
4367
4368 if (IgnoreUnrecognizedVMOptions) {
4369 cur_cmd_args->ignoreUnrecognized = true;
4370 cur_java_tool_options_args->ignoreUnrecognized = true;
4371 cur_java_options_args->ignoreUnrecognized = true;
4372 }
4373
4374 // Parse specified settings file
4375 if (settings_file_specified) {
4376 if (!process_settings_file(flags_file, true,
4377 cur_cmd_args->ignoreUnrecognized)) {
4378 return JNI_EINVAL;
4379 }
4380 } else {
4381 #ifdef ASSERT
4382 // Parse default .hotspotrc settings file
4383 if (!process_settings_file(".hotspotrc", false,
4384 cur_cmd_args->ignoreUnrecognized)) {
4385 return JNI_EINVAL;
4386 }
4387 #else
4388 struct stat buf;
4389 if (os::stat(hotspotrc, &buf) == 0) {
4390 needs_hotspotrc_warning = true;
4391 }
4392 #endif
4393 }
4394
4395 if (PrintVMOptions) {
4396 print_options(cur_java_tool_options_args);
4397 print_options(cur_cmd_args);
4398 print_options(cur_java_options_args);
4399 }
4400
4401 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4402 jint result = parse_vm_init_args(cur_java_tool_options_args,
4403 cur_java_options_args,
4404 cur_cmd_args);
4405
4406 if (result != JNI_OK) {
4407 return result;
4408 }
4409
4410 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4411 SharedArchivePath = get_shared_archive_path();
4412 if (SharedArchivePath == NULL) {
4413 return JNI_ENOMEM;
4414 }
4415
4416 // Set up VerifySharedSpaces
4417 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4418 VerifySharedSpaces = true;
4419 }
4420
4421 // Delay warning until here so that we've had a chance to process
4422 // the -XX:-PrintWarnings flag
4423 if (needs_hotspotrc_warning) {
4424 warning("%s file is present but has been ignored. "
4425 "Run with -XX:Flags=%s to load the file.",
4426 hotspotrc, hotspotrc);
4427 }
4428
4429 if (needs_module_property_warning) {
4430 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4431 " names that are reserved for internal use.");
4432 }
4433
4434 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4435 UNSUPPORTED_OPTION(UseLargePages);
4436 #endif
4437
4438 ArgumentsExt::report_unsupported_options();
4439
4440 #ifndef PRODUCT
4441 if (TraceBytecodesAt != 0) {
4442 TraceBytecodes = true;
4443 }
4444 if (CountCompiledCalls) {
4445 if (UseCounterDecay) {
4446 warning("UseCounterDecay disabled because CountCalls is set");
4447 UseCounterDecay = false;
4448 }
4449 }
4450 #endif // PRODUCT
4451
4452 if (ScavengeRootsInCode == 0) {
4453 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4454 warning("Forcing ScavengeRootsInCode non-zero");
4455 }
4456 ScavengeRootsInCode = 1;
4457 }
4458
4459 if (!handle_deprecated_print_gc_flags()) {
4460 return JNI_EINVAL;
4461 }
4462
4463 // Set object alignment values.
4464 set_object_alignment();
4465
4466 #if !INCLUDE_CDS
4467 if (DumpSharedSpaces || RequireSharedSpaces) {
4468 jio_fprintf(defaultStream::error_stream(),
4469 "Shared spaces are not supported in this VM\n");
4470 return JNI_ERR;
4471 }
4472 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4473 log_is_enabled(Info, cds)) {
4474 warning("Shared spaces are not supported in this VM");
4475 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4476 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4477 }
4478 no_shared_spaces("CDS Disabled");
4479 #endif // INCLUDE_CDS
4480
4481 return JNI_OK;
4482 }
4483
4484 jint Arguments::apply_ergo() {
4485 // Set flags based on ergonomics.
4486 set_ergonomics_flags();
4487
4488 #if INCLUDE_JVMCI
4489 set_jvmci_specific_flags();
4490 #endif
4491
4492 set_shared_spaces_flags();
4493
4494 #if defined(SPARC)
4495 // BIS instructions require 'membar' instruction regardless of the number
4496 // of CPUs because in virtualized/container environments which might use only 1
4497 // CPU, BIS instructions may produce incorrect results.
4498
4499 if (FLAG_IS_DEFAULT(AssumeMP)) {
4500 FLAG_SET_DEFAULT(AssumeMP, true);
4501 }
4502 #endif
4503
4504 // Check the GC selections again.
4505 if (!check_gc_consistency()) {
4506 return JNI_EINVAL;
4507 }
4508
4509 if (TieredCompilation) {
4510 set_tiered_flags();
4511 } else {
4512 int max_compilation_policy_choice = 1;
4513 #ifdef COMPILER2
4514 if (is_server_compilation_mode_vm()) {
4515 max_compilation_policy_choice = 2;
4516 }
4517 #endif
4518 // Check if the policy is valid.
4519 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4520 vm_exit_during_initialization(
4521 "Incompatible compilation policy selected", NULL);
4522 }
4523 // Scale CompileThreshold
4524 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4525 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4526 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4527 }
4528 }
4529
4530 #ifdef COMPILER2
4531 #ifndef PRODUCT
4532 if (PrintIdealGraphLevel > 0) {
4533 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4534 }
4535 #endif
4536 #endif
4537
4538 // Set heap size based on available physical memory
4539 set_heap_size();
4540
4541 ArgumentsExt::set_gc_specific_flags();
4542
4543 // Initialize Metaspace flags and alignments
4544 Metaspace::ergo_initialize();
4545
4546 // Set bytecode rewriting flags
4547 set_bytecode_flags();
4548
4549 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4550 jint code = set_aggressive_opts_flags();
4551 if (code != JNI_OK) {
4552 return code;
4553 }
4554
4555 // Turn off biased locking for locking debug mode flags,
4556 // which are subtly different from each other but neither works with
4557 // biased locking
4558 if (UseHeavyMonitors
4559 #ifdef COMPILER1
4560 || !UseFastLocking
4561 #endif // COMPILER1
4562 #if INCLUDE_JVMCI
4563 || !JVMCIUseFastLocking
4564 #endif
4565 ) {
4566 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4567 // flag set to true on command line; warn the user that they
4568 // can't enable biased locking here
4569 warning("Biased Locking is not supported with locking debug flags"
4570 "; ignoring UseBiasedLocking flag." );
4571 }
4572 UseBiasedLocking = false;
4573 }
4574
4575 #ifdef CC_INTERP
4576 // Clear flags not supported on zero.
4577 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4578 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4579 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4580 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4581 #endif // CC_INTERP
4582
4583 #ifdef COMPILER2
4584 if (!EliminateLocks) {
4585 EliminateNestedLocks = false;
4586 }
4587 if (!Inline) {
4588 IncrementalInline = false;
4589 }
4590 #ifndef PRODUCT
4591 if (!IncrementalInline) {
4592 AlwaysIncrementalInline = false;
4593 }
4594 #endif
4595 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4596 // nothing to use the profiling, turn if off
4597 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4598 }
4599 #endif
4600
4601 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4602 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4603 DebugNonSafepoints = true;
4604 }
4605
4606 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4607 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4608 }
4609
4610 if (UseOnStackReplacement && !UseLoopCounter) {
4611 warning("On-stack-replacement requires loop counters; enabling loop counters");
4612 FLAG_SET_DEFAULT(UseLoopCounter, true);
4613 }
4614
4615 #ifndef PRODUCT
4616 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4617 if (use_vm_log()) {
4618 LogVMOutput = true;
4619 }
4620 }
4621 #endif // PRODUCT
4622
4623 if (PrintCommandLineFlags) {
4624 CommandLineFlags::printSetFlags(tty);
4625 }
4626
4627 // Apply CPU specific policy for the BiasedLocking
4628 if (UseBiasedLocking) {
4629 if (!VM_Version::use_biased_locking() &&
4630 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4631 UseBiasedLocking = false;
4632 }
4633 }
4634 #ifdef COMPILER2
4635 if (!UseBiasedLocking || EmitSync != 0) {
4636 UseOptoBiasInlining = false;
4637 }
4638 #endif
4639
4640 return JNI_OK;
4641 }
4642
4643 jint Arguments::adjust_after_os() {
4644 if (UseNUMA) {
4645 if (UseParallelGC || UseParallelOldGC) {
4646 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4647 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4648 }
4649 }
4650 // UseNUMAInterleaving is set to ON for all collectors and
4651 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4652 // such as the parallel collector for Linux and Solaris will
4653 // interleave old gen and survivor spaces on top of NUMA
4654 // allocation policy for the eden space.
4655 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4656 // all platforms and ParallelGC on Windows will interleave all
4657 // of the heap spaces across NUMA nodes.
4658 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4659 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4660 }
4661 }
4662 return JNI_OK;
4663 }
4664
4665 int Arguments::PropertyList_count(SystemProperty* pl) {
4666 int count = 0;
4667 while(pl != NULL) {
4668 count++;
4669 pl = pl->next();
4670 }
4671 return count;
4672 }
4673
4674 // Return the number of readable properties.
4675 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4676 int count = 0;
4677 while(pl != NULL) {
4678 if (pl->is_readable()) {
4679 count++;
4680 }
4681 pl = pl->next();
4682 }
4683 return count;
4684 }
4685
4686 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4687 assert(key != NULL, "just checking");
4688 SystemProperty* prop;
4689 for (prop = pl; prop != NULL; prop = prop->next()) {
4690 if (strcmp(key, prop->key()) == 0) return prop->value();
4691 }
4692 return NULL;
4693 }
4694
4695 // Return the value of the requested property provided that it is a readable property.
4696 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4697 assert(key != NULL, "just checking");
4698 SystemProperty* prop;
4699 // Return the property value if the keys match and the property is not internal or
4700 // it's the special internal property "jdk.boot.class.path.append".
4701 for (prop = pl; prop != NULL; prop = prop->next()) {
4702 if (strcmp(key, prop->key()) == 0) {
4703 if (!prop->internal()) {
4704 return prop->value();
4705 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4706 return prop->value();
4707 } else {
4708 // Property is internal and not jdk.boot.class.path.append so return NULL.
4709 return NULL;
4710 }
4711 }
4712 }
4713 return NULL;
4714 }
4715
4716 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4717 int count = 0;
4718 const char* ret_val = NULL;
4719
4720 while(pl != NULL) {
4721 if(count >= index) {
4722 ret_val = pl->key();
4723 break;
4724 }
4725 count++;
4726 pl = pl->next();
4727 }
4728
4729 return ret_val;
4730 }
4731
4732 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4733 int count = 0;
4734 char* ret_val = NULL;
4735
4736 while(pl != NULL) {
4737 if(count >= index) {
4738 ret_val = pl->value();
4739 break;
4740 }
4741 count++;
4742 pl = pl->next();
4743 }
4744
4745 return ret_val;
4746 }
4747
4748 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4749 SystemProperty* p = *plist;
4750 if (p == NULL) {
4751 *plist = new_p;
4752 } else {
4753 while (p->next() != NULL) {
4754 p = p->next();
4755 }
4756 p->set_next(new_p);
4757 }
4758 }
4759
4760 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4761 bool writeable, bool internal) {
4762 if (plist == NULL)
4763 return;
4764
4765 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4766 PropertyList_add(plist, new_p);
4767 }
4768
4769 void Arguments::PropertyList_add(SystemProperty *element) {
4770 PropertyList_add(&_system_properties, element);
4771 }
4772
4773 // This add maintains unique property key in the list.
4774 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4775 PropertyAppendable append, PropertyWriteable writeable,
4776 PropertyInternal internal) {
4777 if (plist == NULL)
4778 return;
4779
4780 // If property key exist then update with new value.
4781 SystemProperty* prop;
4782 for (prop = *plist; prop != NULL; prop = prop->next()) {
4783 if (strcmp(k, prop->key()) == 0) {
4784 if (append == AppendProperty) {
4785 prop->append_value(v);
4786 } else {
4787 prop->set_value(v);
4788 }
4789 return;
4790 }
4791 }
4792
4793 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4794 }
4795
4796 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4797 // Returns true if all of the source pointed by src has been copied over to
4798 // the destination buffer pointed by buf. Otherwise, returns false.
4799 // Notes:
4800 // 1. If the length (buflen) of the destination buffer excluding the
4801 // NULL terminator character is not long enough for holding the expanded
4802 // pid characters, it also returns false instead of returning the partially
4803 // expanded one.
4804 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4805 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4806 char* buf, size_t buflen) {
4807 const char* p = src;
4808 char* b = buf;
4809 const char* src_end = &src[srclen];
4810 char* buf_end = &buf[buflen - 1];
4811
4812 while (p < src_end && b < buf_end) {
4813 if (*p == '%') {
4814 switch (*(++p)) {
4815 case '%': // "%%" ==> "%"
4816 *b++ = *p++;
4817 break;
4818 case 'p': { // "%p" ==> current process id
4819 // buf_end points to the character before the last character so
4820 // that we could write '\0' to the end of the buffer.
4821 size_t buf_sz = buf_end - b + 1;
4822 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4823
4824 // if jio_snprintf fails or the buffer is not long enough to hold
4825 // the expanded pid, returns false.
4826 if (ret < 0 || ret >= (int)buf_sz) {
4827 return false;
4828 } else {
4829 b += ret;
4830 assert(*b == '\0', "fail in copy_expand_pid");
4831 if (p == src_end && b == buf_end + 1) {
4832 // reach the end of the buffer.
4833 return true;
4834 }
4835 }
4836 p++;
4837 break;
4838 }
4839 default :
4840 *b++ = '%';
4841 }
4842 } else {
4843 *b++ = *p++;
4844 }
4845 }
4846 *b = '\0';
4847 return (p == src_end); // return false if not all of the source was copied
4848 }