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