1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/symbolTable.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvm.h"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/vm_version.hpp"
54 #include "services/management.hpp"
55 #include "services/memTracker.hpp"
56 #include "utilities/align.hpp"
57 #include "utilities/defaultStream.hpp"
58 #include "utilities/macros.hpp"
59 #include "utilities/stringUtils.hpp"
60 #if INCLUDE_JVMCI
61 #include "jvmci/jvmciRuntime.hpp"
62 #endif
63 #if INCLUDE_ALL_GCS
64 #include "gc/cms/compactibleFreeListSpace.hpp"
65 #include "gc/g1/g1CollectedHeap.inline.hpp"
66 #include "gc/parallel/parallelScavengeHeap.hpp"
67 #endif // INCLUDE_ALL_GCS
68
69 // Note: This is a special bug reporting site for the JVM
70 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
71 #define DEFAULT_JAVA_LAUNCHER "generic"
72
73 char* Arguments::_jvm_flags_file = NULL;
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 bool Arguments::_has_profile = false;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 size_t Arguments::_min_heap_size = 0;
84 Arguments::Mode Arguments::_mode = _mixed;
85 bool Arguments::_java_compiler = false;
86 bool Arguments::_xdebug_mode = false;
87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
89 int Arguments::_sun_java_launcher_pid = -1;
90 bool Arguments::_sun_java_launcher_is_altjvm = false;
91
92 // These parameters are reset in method parse_vm_init_args()
93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
95 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
96 bool Arguments::_ClipInlining = ClipInlining;
97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
99
100 char* Arguments::SharedArchivePath = NULL;
101
102 AgentLibraryList Arguments::_libraryList;
103 AgentLibraryList Arguments::_agentList;
104
105 abort_hook_t Arguments::_abort_hook = NULL;
106 exit_hook_t Arguments::_exit_hook = NULL;
107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
108
109
110 SystemProperty *Arguments::_sun_boot_library_path = NULL;
111 SystemProperty *Arguments::_java_library_path = NULL;
112 SystemProperty *Arguments::_java_home = NULL;
113 SystemProperty *Arguments::_java_class_path = NULL;
114 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
115
116 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
117 PathString *Arguments::_system_boot_class_path = NULL;
118 bool Arguments::_has_jimage = false;
119
120 char* Arguments::_ext_dirs = NULL;
121
122 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
123 // part of the option string.
124 static bool match_option(const JavaVMOption *option, const char* name,
125 const char** tail) {
126 size_t len = strlen(name);
127 if (strncmp(option->optionString, name, len) == 0) {
128 *tail = option->optionString + len;
129 return true;
130 } else {
131 return false;
132 }
133 }
134
135 // Check if 'option' matches 'name'. No "tail" is allowed.
136 static bool match_option(const JavaVMOption *option, const char* name) {
137 const char* tail = NULL;
138 bool result = match_option(option, name, &tail);
139 if (tail != NULL && *tail == '\0') {
140 return result;
141 } else {
142 return false;
143 }
144 }
145
146 // Return true if any of the strings in null-terminated array 'names' matches.
147 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
148 // the option must match exactly.
149 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
150 bool tail_allowed) {
151 for (/* empty */; *names != NULL; ++names) {
152 if (match_option(option, *names, tail)) {
153 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
154 return true;
155 }
156 }
157 }
158 return false;
159 }
160
161 static void logOption(const char* opt) {
162 if (PrintVMOptions) {
163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
164 }
165 }
166
167 bool needs_module_property_warning = false;
168
169 #define MODULE_PROPERTY_PREFIX "jdk.module."
170 #define MODULE_PROPERTY_PREFIX_LEN 11
171 #define ADDEXPORTS "addexports"
172 #define ADDEXPORTS_LEN 10
173 #define ADDREADS "addreads"
174 #define ADDREADS_LEN 8
175 #define ADDOPENS "addopens"
176 #define ADDOPENS_LEN 8
177 #define PATCH "patch"
178 #define PATCH_LEN 5
179 #define ADDMODS "addmods"
180 #define ADDMODS_LEN 7
181 #define LIMITMODS "limitmods"
182 #define LIMITMODS_LEN 9
183 #define PATH "path"
184 #define PATH_LEN 4
185 #define UPGRADE_PATH "upgrade.path"
186 #define UPGRADE_PATH_LEN 12
187
188 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
189 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
190 return ((strncmp(option, property, len) == 0) &&
191 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
192 }
193
194 // Return true if property starts with "jdk.module." and its ensuing chars match
195 // any of the reserved module properties.
196 // property should be passed without the leading "-D".
197 bool Arguments::is_internal_module_property(const char* property) {
198 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
199 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
200 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
201 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
202 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
203 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
204 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
205 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
206 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
207 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
208 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
209 return true;
210 }
211 }
212 return false;
213 }
214
215 // Process java launcher properties.
216 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
217 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
218 // sun.java.launcher.pid is defined.
219 // Must do this before setting up other system properties,
220 // as some of them may depend on launcher type.
221 for (int index = 0; index < args->nOptions; index++) {
222 const JavaVMOption* option = args->options + index;
223 const char* tail;
224
225 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
226 process_java_launcher_argument(tail, option->extraInfo);
227 continue;
228 }
229 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
230 if (strcmp(tail, "true") == 0) {
231 _sun_java_launcher_is_altjvm = true;
232 }
233 continue;
234 }
235 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
236 _sun_java_launcher_pid = atoi(tail);
237 continue;
238 }
239 }
240 }
241
242 // Initialize system properties key and value.
243 void Arguments::init_system_properties() {
244
245 // Set up _system_boot_class_path which is not a property but
246 // relies heavily on argument processing and the jdk.boot.class.path.append
247 // property. It is used to store the underlying system boot class path.
248 _system_boot_class_path = new PathString(NULL);
249
250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
251 "Java Virtual Machine Specification", false));
252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
253 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
254 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
255 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
256
257 // Following are JVMTI agent writable properties.
258 // Properties values are set to NULL and they are
259 // os specific they are initialized in os::init_system_properties_values().
260 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
261 _java_library_path = new SystemProperty("java.library.path", NULL, true);
262 _java_home = new SystemProperty("java.home", NULL, true);
263 _java_class_path = new SystemProperty("java.class.path", "", true);
264 // jdk.boot.class.path.append is a non-writeable, internal property.
265 // It can only be set by either:
266 // - -Xbootclasspath/a:
267 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
268 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
269
270 // Add to System Property list.
271 PropertyList_add(&_system_properties, _sun_boot_library_path);
272 PropertyList_add(&_system_properties, _java_library_path);
273 PropertyList_add(&_system_properties, _java_home);
274 PropertyList_add(&_system_properties, _java_class_path);
275 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
276
277 // Set OS specific system properties values
278 os::init_system_properties_values();
279 }
280
281 // Update/Initialize System properties after JDK version number is known
282 void Arguments::init_version_specific_system_properties() {
283 enum { bufsz = 16 };
284 char buffer[bufsz];
285 const char* spec_vendor = "Oracle Corporation";
286 uint32_t spec_version = JDK_Version::current().major_version();
287
288 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
289
290 PropertyList_add(&_system_properties,
291 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
292 PropertyList_add(&_system_properties,
293 new SystemProperty("java.vm.specification.version", buffer, false));
294 PropertyList_add(&_system_properties,
295 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
296 }
297
298 /*
299 * -XX argument processing:
300 *
301 * -XX arguments are defined in several places, such as:
302 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
303 * -XX arguments are parsed in parse_argument().
304 * -XX argument bounds checking is done in check_vm_args_consistency().
305 *
306 * Over time -XX arguments may change. There are mechanisms to handle common cases:
307 *
308 * ALIASED: An option that is simply another name for another option. This is often
309 * part of the process of deprecating a flag, but not all aliases need
310 * to be deprecated.
311 *
312 * Create an alias for an option by adding the old and new option names to the
313 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
314 *
315 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
316 * support may be removed in the future. Both regular and aliased options may be
317 * deprecated.
318 *
319 * Add a deprecation warning for an option (or alias) by adding an entry in the
320 * "special_jvm_flags" table and setting the "deprecated_in" field.
321 * Often an option "deprecated" in one major release will
322 * be made "obsolete" in the next. In this case the entry should also have its
323 * "obsolete_in" field set.
324 *
325 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
326 * on the command line. A warning is printed to let the user know that option might not
327 * be accepted in the future.
328 *
329 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
330 * table and setting the "obsolete_in" field.
331 *
332 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
333 * to the current JDK version. The system will flatly refuse to admit the existence of
334 * the flag. This allows a flag to die automatically over JDK releases.
335 *
336 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
337 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
338 * - Newly obsolete or expired deprecated options should have their global variable
339 * definitions removed (from globals.hpp, etc) and related implementations removed.
340 *
341 * Recommended approach for removing options:
342 *
343 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
344 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
345 *
346 * To remove internal options (e.g. diagnostic, experimental, develop options), use
347 * a 2-step model adding major release numbers to the obsolete and expire columns.
348 *
349 * To change the name of an option, use the alias table as well as a 2-step
350 * model adding major release numbers to the deprecate and expire columns.
351 * Think twice about aliasing commonly used customer options.
352 *
353 * There are times when it is appropriate to leave a future release number as undefined.
354 *
355 * Tests: Aliases should be tested in VMAliasOptions.java.
356 * Deprecated options should be tested in VMDeprecatedOptions.java.
357 */
358
359 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
360 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
361 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
362 // the command-line as usual, but will issue a warning.
363 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
364 // the command-line, while issuing a warning and ignoring the flag value.
365 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
366 // existence of the flag.
367 //
368 // MANUAL CLEANUP ON JDK VERSION UPDATES:
369 // This table ensures that the handling of options will update automatically when the JDK
370 // version is incremented, but the source code needs to be cleanup up manually:
371 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
372 // variable should be removed, as well as users of the variable.
373 // - As "deprecated" options age into "obsolete" options, move the entry into the
374 // "Obsolete Flags" section of the table.
375 // - All expired options should be removed from the table.
376 static SpecialFlag const special_jvm_flags[] = {
377 // -------------- Deprecated Flags --------------
378 // --- Non-alias flags - sorted by obsolete_in then expired_in:
379 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
380 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
381 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
382 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
383 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
384 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
385
386 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
387 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
388 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
389 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
390 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
391
392 // -------------- Obsolete Flags - sorted by expired_in --------------
393 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
394 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
395 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
396 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
397 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
398
399 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
400 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
401 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
402 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
403 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
404 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
405 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
406 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
407 #endif
408
409 { NULL, JDK_Version(0), JDK_Version(0) }
410 };
411
412 // Flags that are aliases for other flags.
413 typedef struct {
414 const char* alias_name;
415 const char* real_name;
416 } AliasedFlag;
417
418 static AliasedFlag const aliased_jvm_flags[] = {
419 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
420 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
421 { NULL, NULL}
422 };
423
424 // NOTE: A compatibility request will be necessary for each alias to be removed.
425 static AliasedLoggingFlag const aliased_logging_flags[] = {
426 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
427 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
428 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
429 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
430 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
431 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
432 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
433 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
434 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
435 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
436 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
437 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
438 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
439 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
440 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
441 };
442
443 #ifndef PRODUCT
444 // These options are removed in jdk9. Remove this code for jdk10.
445 static AliasedFlag const removed_develop_logging_flags[] = {
446 { "TraceClassInitialization", "-Xlog:class+init" },
447 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
448 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
449 { "TraceItables", "-Xlog:itables=debug" },
450 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
451 { "TraceSafepoint", "-Xlog:safepoint=debug" },
452 { "TraceStartupTime", "-Xlog:startuptime" },
453 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
454 { "PrintVtables", "-Xlog:vtables=debug" },
455 { "VerboseVerification", "-Xlog:verification" },
456 { NULL, NULL }
457 };
458 #endif //PRODUCT
459
460 // Return true if "v" is less than "other", where "other" may be "undefined".
461 static bool version_less_than(JDK_Version v, JDK_Version other) {
462 assert(!v.is_undefined(), "must be defined");
463 if (!other.is_undefined() && v.compare(other) >= 0) {
464 return false;
465 } else {
466 return true;
467 }
468 }
469
470 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
471
472 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
473 // Allow extensions to have priority
474 if (lookup_special_flag_ext(flag_name, flag)) {
475 return true;
476 }
477
478 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
479 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
480 flag = special_jvm_flags[i];
481 return true;
482 }
483 }
484 return false;
485 }
486
487 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
488 assert(version != NULL, "Must provide a version buffer");
489 SpecialFlag flag;
490 if (lookup_special_flag(flag_name, flag)) {
491 if (!flag.obsolete_in.is_undefined()) {
492 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
493 *version = flag.obsolete_in;
494 return true;
495 }
496 }
497 }
498 return false;
499 }
500
501 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
502 assert(version != NULL, "Must provide a version buffer");
503 SpecialFlag flag;
504 if (lookup_special_flag(flag_name, flag)) {
505 if (!flag.deprecated_in.is_undefined()) {
506 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
507 version_less_than(JDK_Version::current(), flag.expired_in)) {
508 *version = flag.deprecated_in;
509 return 1;
510 } else {
511 return -1;
512 }
513 }
514 }
515 return 0;
516 }
517
518 #ifndef PRODUCT
519 const char* Arguments::removed_develop_logging_flag_name(const char* name){
520 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
521 const AliasedFlag& flag = removed_develop_logging_flags[i];
522 if (strcmp(flag.alias_name, name) == 0) {
523 return flag.real_name;
524 }
525 }
526 return NULL;
527 }
528 #endif // PRODUCT
529
530 const char* Arguments::real_flag_name(const char *flag_name) {
531 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
532 const AliasedFlag& flag_status = aliased_jvm_flags[i];
533 if (strcmp(flag_status.alias_name, flag_name) == 0) {
534 return flag_status.real_name;
535 }
536 }
537 return flag_name;
538 }
539
540 #ifdef ASSERT
541 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
542 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
543 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
544 return true;
545 }
546 }
547 return false;
548 }
549
550 static bool verify_special_jvm_flags() {
551 bool success = true;
552 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
553 const SpecialFlag& flag = special_jvm_flags[i];
554 if (lookup_special_flag(flag.name, i)) {
555 warning("Duplicate special flag declaration \"%s\"", flag.name);
556 success = false;
557 }
558 if (flag.deprecated_in.is_undefined() &&
559 flag.obsolete_in.is_undefined()) {
560 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
561 success = false;
562 }
563
564 if (!flag.deprecated_in.is_undefined()) {
565 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
566 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
567 success = false;
568 }
569
570 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
571 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
572 success = false;
573 }
574 }
575
576 if (!flag.obsolete_in.is_undefined()) {
577 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
578 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
579 success = false;
580 }
581
582 // if flag has become obsolete it should not have a "globals" flag defined anymore.
583 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
584 if (Flag::find_flag(flag.name) != NULL) {
585 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
586 success = false;
587 }
588 }
589 }
590
591 if (!flag.expired_in.is_undefined()) {
592 // if flag has become expired it should not have a "globals" flag defined anymore.
593 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
594 if (Flag::find_flag(flag.name) != NULL) {
595 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
596 success = false;
597 }
598 }
599 }
600
601 }
602 return success;
603 }
604 #endif
605
606 // Parses a size specification string.
607 bool Arguments::atojulong(const char *s, julong* result) {
608 julong n = 0;
609
610 // First char must be a digit. Don't allow negative numbers or leading spaces.
611 if (!isdigit(*s)) {
612 return false;
613 }
614
615 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
616 char* remainder;
617 errno = 0;
618 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
619 if (errno != 0) {
620 return false;
621 }
622
623 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
624 if (remainder == s || strlen(remainder) > 1) {
625 return false;
626 }
627
628 switch (*remainder) {
629 case 'T': case 't':
630 *result = n * G * K;
631 // Check for overflow.
632 if (*result/((julong)G * K) != n) return false;
633 return true;
634 case 'G': case 'g':
635 *result = n * G;
636 if (*result/G != n) return false;
637 return true;
638 case 'M': case 'm':
639 *result = n * M;
640 if (*result/M != n) return false;
641 return true;
642 case 'K': case 'k':
643 *result = n * K;
644 if (*result/K != n) return false;
645 return true;
646 case '\0':
647 *result = n;
648 return true;
649 default:
650 return false;
651 }
652 }
653
654 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
655 if (size < min_size) return arg_too_small;
656 if (size > max_size) return arg_too_big;
657 return arg_in_range;
658 }
659
660 // Describe an argument out of range error
661 void Arguments::describe_range_error(ArgsRange errcode) {
662 switch(errcode) {
663 case arg_too_big:
664 jio_fprintf(defaultStream::error_stream(),
665 "The specified size exceeds the maximum "
666 "representable size.\n");
667 break;
668 case arg_too_small:
669 case arg_unreadable:
670 case arg_in_range:
671 // do nothing for now
672 break;
673 default:
674 ShouldNotReachHere();
675 }
676 }
677
678 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
679 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
680 return true;
681 } else {
682 return false;
683 }
684 }
685
686 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
687 char* end;
688 errno = 0;
689 double v = strtod(value, &end);
690 if ((errno != 0) || (*end != 0)) {
691 return false;
692 }
693
694 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
695 return true;
696 }
697 return false;
698 }
699
700 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
701 julong v;
702 int int_v;
703 intx intx_v;
704 bool is_neg = false;
705 Flag* result = Flag::find_flag(name, strlen(name));
706
707 if (result == NULL) {
708 return false;
709 }
710
711 // Check the sign first since atojulong() parses only unsigned values.
712 if (*value == '-') {
713 if (!result->is_intx() && !result->is_int()) {
714 return false;
715 }
716 value++;
717 is_neg = true;
718 }
719 if (!Arguments::atojulong(value, &v)) {
720 return false;
721 }
722 if (result->is_int()) {
723 int_v = (int) v;
724 if (is_neg) {
725 int_v = -int_v;
726 }
727 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
728 } else if (result->is_uint()) {
729 uint uint_v = (uint) v;
730 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
731 } else if (result->is_intx()) {
732 intx_v = (intx) v;
733 if (is_neg) {
734 intx_v = -intx_v;
735 }
736 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
737 } else if (result->is_uintx()) {
738 uintx uintx_v = (uintx) v;
739 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
740 } else if (result->is_uint64_t()) {
741 uint64_t uint64_t_v = (uint64_t) v;
742 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
743 } else if (result->is_size_t()) {
744 size_t size_t_v = (size_t) v;
745 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
746 } else if (result->is_double()) {
747 double double_v = (double) v;
748 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
749 } else {
750 return false;
751 }
752 }
753
754 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
755 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
756 // Contract: CommandLineFlags always returns a pointer that needs freeing.
757 FREE_C_HEAP_ARRAY(char, value);
758 return true;
759 }
760
761 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
762 const char* old_value = "";
763 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
764 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
765 size_t new_len = strlen(new_value);
766 const char* value;
767 char* free_this_too = NULL;
768 if (old_len == 0) {
769 value = new_value;
770 } else if (new_len == 0) {
771 value = old_value;
772 } else {
773 size_t length = old_len + 1 + new_len + 1;
774 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
775 // each new setting adds another LINE to the switch:
776 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
777 value = buf;
778 free_this_too = buf;
779 }
780 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
781 // CommandLineFlags always returns a pointer that needs freeing.
782 FREE_C_HEAP_ARRAY(char, value);
783 if (free_this_too != NULL) {
784 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
785 FREE_C_HEAP_ARRAY(char, free_this_too);
786 }
787 return true;
788 }
789
790 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
791 const char* real_name = real_flag_name(arg);
792 JDK_Version since = JDK_Version();
793 switch (is_deprecated_flag(arg, &since)) {
794 case -1:
795 return NULL; // obsolete or expired, don't process normally
796 case 0:
797 return real_name;
798 case 1: {
799 if (warn) {
800 char version[256];
801 since.to_string(version, sizeof(version));
802 if (real_name != arg) {
803 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
804 arg, version, real_name);
805 } else {
806 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
807 arg, version);
808 }
809 }
810 return real_name;
811 }
812 }
813 ShouldNotReachHere();
814 return NULL;
815 }
816
817 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
818 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
819 // Set tagset string buffer at max size of 256, large enough for any alias tagset
820 const int max_tagset_size = 256;
821 int max_tagset_len = max_tagset_size - 1;
822 char tagset_buffer[max_tagset_size];
823 tagset_buffer[0] = '\0';
824
825 // Write tag-set for aliased logging option, in string list form
826 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
827 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
828 if (i > 0) {
829 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
830 }
831 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
832 }
833 if (!alf.exactMatch) {
834 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
835 }
836 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
837 (on) ? "+" : "-",
838 name,
839 tagset_buffer,
840 (on) ? LogLevel::name(alf.level) : "off");
841 }
842
843 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
844 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
845 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
846 if (strcmp(alf.alias_name, name) == 0) {
847 log_deprecated_flag(name, on, alf);
848 return alf;
849 }
850 }
851 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
852 return a;
853 }
854
855 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
856
857 // range of acceptable characters spelled out for portability reasons
858 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
859 #define BUFLEN 255
860 char name[BUFLEN+1];
861 char dummy;
862 const char* real_name;
863 bool warn_if_deprecated = true;
864
865 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
866 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
867 if (alf.alias_name != NULL){
868 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
869 return true;
870 }
871 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
872 if (real_name == NULL) {
873 return false;
874 }
875 return set_bool_flag(real_name, false, origin);
876 }
877 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
878 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
879 if (alf.alias_name != NULL){
880 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
881 return true;
882 }
883 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
884 if (real_name == NULL) {
885 return false;
886 }
887 return set_bool_flag(real_name, true, origin);
888 }
889
890 char punct;
891 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
892 const char* value = strchr(arg, '=') + 1;
893 Flag* flag;
894
895 // this scanf pattern matches both strings (handled here) and numbers (handled later))
896 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
897 if (alf.alias_name != NULL) {
898 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
899 return true;
900 }
901 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
902 if (real_name == NULL) {
903 return false;
904 }
905 flag = Flag::find_flag(real_name);
906 if (flag != NULL && flag->is_ccstr()) {
907 if (flag->ccstr_accumulates()) {
908 return append_to_string_flag(real_name, value, origin);
909 } else {
910 if (value[0] == '\0') {
911 value = NULL;
912 }
913 return set_string_flag(real_name, value, origin);
914 }
915 } else {
916 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
917 }
918 }
919
920 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
921 const char* value = strchr(arg, '=') + 1;
922 // -XX:Foo:=xxx will reset the string flag to the given value.
923 if (value[0] == '\0') {
924 value = NULL;
925 }
926 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
927 if (real_name == NULL) {
928 return false;
929 }
930 return set_string_flag(real_name, value, origin);
931 }
932
933 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
934 #define SIGNED_NUMBER_RANGE "[-0123456789]"
935 #define NUMBER_RANGE "[0123456789eE+-]"
936 char value[BUFLEN + 1];
937 char value2[BUFLEN + 1];
938 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
939 // Looks like a floating-point number -- try again with more lenient format string
940 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
941 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
942 if (real_name == NULL) {
943 return false;
944 }
945 return set_fp_numeric_flag(real_name, value, origin);
946 }
947 }
948
949 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
950 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
951 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
952 if (real_name == NULL) {
953 return false;
954 }
955 return set_numeric_flag(real_name, value, origin);
956 }
957
958 return false;
959 }
960
961 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
962 assert(bldarray != NULL, "illegal argument");
963
964 if (arg == NULL) {
965 return;
966 }
967
968 int new_count = *count + 1;
969
970 // expand the array and add arg to the last element
971 if (*bldarray == NULL) {
972 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
973 } else {
974 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
975 }
976 (*bldarray)[*count] = os::strdup_check_oom(arg);
977 *count = new_count;
978 }
979
980 void Arguments::build_jvm_args(const char* arg) {
981 add_string(&_jvm_args_array, &_num_jvm_args, arg);
982 }
983
984 void Arguments::build_jvm_flags(const char* arg) {
985 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
986 }
987
988 // utility function to return a string that concatenates all
989 // strings in a given char** array
990 const char* Arguments::build_resource_string(char** args, int count) {
991 if (args == NULL || count == 0) {
992 return NULL;
993 }
994 size_t length = 0;
995 for (int i = 0; i < count; i++) {
996 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
997 }
998 char* s = NEW_RESOURCE_ARRAY(char, length);
999 char* dst = s;
1000 for (int j = 0; j < count; j++) {
1001 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1002 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1003 dst += offset;
1004 length -= offset;
1005 }
1006 return (const char*) s;
1007 }
1008
1009 void Arguments::print_on(outputStream* st) {
1010 st->print_cr("VM Arguments:");
1011 if (num_jvm_flags() > 0) {
1012 st->print("jvm_flags: "); print_jvm_flags_on(st);
1013 st->cr();
1014 }
1015 if (num_jvm_args() > 0) {
1016 st->print("jvm_args: "); print_jvm_args_on(st);
1017 st->cr();
1018 }
1019 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1020 if (_java_class_path != NULL) {
1021 char* path = _java_class_path->value();
1022 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1023 }
1024 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1025 }
1026
1027 void Arguments::print_summary_on(outputStream* st) {
1028 // Print the command line. Environment variables that are helpful for
1029 // reproducing the problem are written later in the hs_err file.
1030 // flags are from setting file
1031 if (num_jvm_flags() > 0) {
1032 st->print_raw("Settings File: ");
1033 print_jvm_flags_on(st);
1034 st->cr();
1035 }
1036 // args are the command line and environment variable arguments.
1037 st->print_raw("Command Line: ");
1038 if (num_jvm_args() > 0) {
1039 print_jvm_args_on(st);
1040 }
1041 // this is the classfile and any arguments to the java program
1042 if (java_command() != NULL) {
1043 st->print("%s", java_command());
1044 }
1045 st->cr();
1046 }
1047
1048 void Arguments::print_jvm_flags_on(outputStream* st) {
1049 if (_num_jvm_flags > 0) {
1050 for (int i=0; i < _num_jvm_flags; i++) {
1051 st->print("%s ", _jvm_flags_array[i]);
1052 }
1053 }
1054 }
1055
1056 void Arguments::print_jvm_args_on(outputStream* st) {
1057 if (_num_jvm_args > 0) {
1058 for (int i=0; i < _num_jvm_args; i++) {
1059 st->print("%s ", _jvm_args_array[i]);
1060 }
1061 }
1062 }
1063
1064 bool Arguments::process_argument(const char* arg,
1065 jboolean ignore_unrecognized,
1066 Flag::Flags origin) {
1067 JDK_Version since = JDK_Version();
1068
1069 if (parse_argument(arg, origin)) {
1070 return true;
1071 }
1072
1073 // Determine if the flag has '+', '-', or '=' characters.
1074 bool has_plus_minus = (*arg == '+' || *arg == '-');
1075 const char* const argname = has_plus_minus ? arg + 1 : arg;
1076
1077 size_t arg_len;
1078 const char* equal_sign = strchr(argname, '=');
1079 if (equal_sign == NULL) {
1080 arg_len = strlen(argname);
1081 } else {
1082 arg_len = equal_sign - argname;
1083 }
1084
1085 // Only make the obsolete check for valid arguments.
1086 if (arg_len <= BUFLEN) {
1087 // Construct a string which consists only of the argument name without '+', '-', or '='.
1088 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1089 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1090 if (is_obsolete_flag(stripped_argname, &since)) {
1091 char version[256];
1092 since.to_string(version, sizeof(version));
1093 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1094 return true;
1095 }
1096 #ifndef PRODUCT
1097 else {
1098 const char* replacement;
1099 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1100 log_warning(arguments)("%s has been removed. Please use %s instead.",
1101 stripped_argname,
1102 replacement);
1103 return false;
1104 }
1105 }
1106 #endif //PRODUCT
1107 }
1108
1109 // For locked flags, report a custom error message if available.
1110 // Otherwise, report the standard unrecognized VM option.
1111 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1112 if (found_flag != NULL) {
1113 char locked_message_buf[BUFLEN];
1114 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1115 if (strlen(locked_message_buf) == 0) {
1116 if (found_flag->is_bool() && !has_plus_minus) {
1117 jio_fprintf(defaultStream::error_stream(),
1118 "Missing +/- setting for VM option '%s'\n", argname);
1119 } else if (!found_flag->is_bool() && has_plus_minus) {
1120 jio_fprintf(defaultStream::error_stream(),
1121 "Unexpected +/- setting in VM option '%s'\n", argname);
1122 } else {
1123 jio_fprintf(defaultStream::error_stream(),
1124 "Improperly specified VM option '%s'\n", argname);
1125 }
1126 } else {
1127 #ifdef PRODUCT
1128 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1129 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1130 if (ignore_unrecognized && mismatched) {
1131 return true;
1132 }
1133 #endif
1134 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1135 }
1136 } else {
1137 if (ignore_unrecognized) {
1138 return true;
1139 }
1140 jio_fprintf(defaultStream::error_stream(),
1141 "Unrecognized VM option '%s'\n", argname);
1142 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1143 if (fuzzy_matched != NULL) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Did you mean '%s%s%s'? ",
1146 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1147 fuzzy_matched->_name,
1148 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1149 }
1150 }
1151
1152 // allow for commandline "commenting out" options like -XX:#+Verbose
1153 return arg[0] == '#';
1154 }
1155
1156 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1157 FILE* stream = fopen(file_name, "rb");
1158 if (stream == NULL) {
1159 if (should_exist) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Could not open settings file %s\n", file_name);
1162 return false;
1163 } else {
1164 return true;
1165 }
1166 }
1167
1168 char token[1024];
1169 int pos = 0;
1170
1171 bool in_white_space = true;
1172 bool in_comment = false;
1173 bool in_quote = false;
1174 char quote_c = 0;
1175 bool result = true;
1176
1177 int c = getc(stream);
1178 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1179 if (in_white_space) {
1180 if (in_comment) {
1181 if (c == '\n') in_comment = false;
1182 } else {
1183 if (c == '#') in_comment = true;
1184 else if (!isspace(c)) {
1185 in_white_space = false;
1186 token[pos++] = c;
1187 }
1188 }
1189 } else {
1190 if (c == '\n' || (!in_quote && isspace(c))) {
1191 // token ends at newline, or at unquoted whitespace
1192 // this allows a way to include spaces in string-valued options
1193 token[pos] = '\0';
1194 logOption(token);
1195 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1196 build_jvm_flags(token);
1197 pos = 0;
1198 in_white_space = true;
1199 in_quote = false;
1200 } else if (!in_quote && (c == '\'' || c == '"')) {
1201 in_quote = true;
1202 quote_c = c;
1203 } else if (in_quote && (c == quote_c)) {
1204 in_quote = false;
1205 } else {
1206 token[pos++] = c;
1207 }
1208 }
1209 c = getc(stream);
1210 }
1211 if (pos > 0) {
1212 token[pos] = '\0';
1213 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1214 build_jvm_flags(token);
1215 }
1216 fclose(stream);
1217 return result;
1218 }
1219
1220 //=============================================================================================================
1221 // Parsing of properties (-D)
1222
1223 const char* Arguments::get_property(const char* key) {
1224 return PropertyList_get_value(system_properties(), key);
1225 }
1226
1227 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1228 const char* eq = strchr(prop, '=');
1229 const char* key;
1230 const char* value = "";
1231
1232 if (eq == NULL) {
1233 // property doesn't have a value, thus use passed string
1234 key = prop;
1235 } else {
1236 // property have a value, thus extract it and save to the
1237 // allocated string
1238 size_t key_len = eq - prop;
1239 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1240
1241 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1242 key = tmp_key;
1243
1244 value = &prop[key_len + 1];
1245 }
1246
1247 if (strcmp(key, "java.compiler") == 0) {
1248 process_java_compiler_argument(value);
1249 // Record value in Arguments, but let it get passed to Java.
1250 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1251 strcmp(key, "sun.java.launcher.pid") == 0) {
1252 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1253 // private and are processed in process_sun_java_launcher_properties();
1254 // the sun.java.launcher property is passed on to the java application
1255 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1256 // append is true, writable is true, internal is false
1257 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1258 WriteableProperty, ExternalProperty);
1259 } else {
1260 if (strcmp(key, "sun.java.command") == 0) {
1261 char *old_java_command = _java_command;
1262 _java_command = os::strdup_check_oom(value, mtArguments);
1263 if (old_java_command != NULL) {
1264 os::free(old_java_command);
1265 }
1266 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1267 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1268 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1269 // its value without going through the property list or making a Java call.
1270 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1271 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1272 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1273 os::free((void *)old_java_vendor_url_bug);
1274 }
1275 }
1276
1277 // Create new property and add at the end of the list
1278 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1279 }
1280
1281 if (key != prop) {
1282 // SystemProperty copy passed value, thus free previously allocated
1283 // memory
1284 FreeHeap((void *)key);
1285 }
1286
1287 return true;
1288 }
1289
1290 #if INCLUDE_CDS
1291 void Arguments::check_unsupported_dumping_properties() {
1292 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1293 const char* unsupported_properties[] = { "jdk.module.main",
1294 "jdk.module.limitmods",
1295 "jdk.module.path",
1296 "jdk.module.upgrade.path",
1297 "jdk.module.addmods.0",
1298 "jdk.module.patch.0" };
1299 const char* unsupported_options[] = { "-m", // cannot use at dump time
1300 "--limit-modules", // ignored at dump time
1301 "--module-path", // ignored at dump time
1302 "--upgrade-module-path", // ignored at dump time
1303 "--add-modules", // ignored at dump time
1304 "--patch-module" // ignored at dump time
1305 };
1306 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1307 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1308 // vm will exit with an error message. Otherwise, it will print an informational message if
1309 // -Xlog:cds is enabled.
1310 uint info_idx = 1;
1311 SystemProperty* sp = system_properties();
1312 while (sp != NULL) {
1313 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1314 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1315 if (i < info_idx) {
1316 vm_exit_during_initialization(
1317 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1318 } else {
1319 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1320 unsupported_options[i]);
1321 }
1322 }
1323 }
1324 sp = sp->next();
1325 }
1326
1327 // Check for an exploded module build in use with -Xshare:dump.
1328 if (!has_jimage()) {
1329 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1330 }
1331 }
1332 #endif
1333
1334 //===========================================================================================================
1335 // Setting int/mixed/comp mode flags
1336
1337 void Arguments::set_mode_flags(Mode mode) {
1338 // Set up default values for all flags.
1339 // If you add a flag to any of the branches below,
1340 // add a default value for it here.
1341 set_java_compiler(false);
1342 _mode = mode;
1343
1344 // Ensure Agent_OnLoad has the correct initial values.
1345 // This may not be the final mode; mode may change later in onload phase.
1346 PropertyList_unique_add(&_system_properties, "java.vm.info",
1347 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1348
1349 UseInterpreter = true;
1350 UseCompiler = true;
1351 UseLoopCounter = true;
1352
1353 // Default values may be platform/compiler dependent -
1354 // use the saved values
1355 ClipInlining = Arguments::_ClipInlining;
1356 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1357 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1358 BackgroundCompilation = Arguments::_BackgroundCompilation;
1359 if (TieredCompilation) {
1360 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1361 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1362 }
1363 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1364 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1365 }
1366 }
1367
1368 // Change from defaults based on mode
1369 switch (mode) {
1370 default:
1371 ShouldNotReachHere();
1372 break;
1373 case _int:
1374 UseCompiler = false;
1375 UseLoopCounter = false;
1376 AlwaysCompileLoopMethods = false;
1377 UseOnStackReplacement = false;
1378 break;
1379 case _mixed:
1380 // same as default
1381 break;
1382 case _comp:
1383 UseInterpreter = false;
1384 BackgroundCompilation = false;
1385 ClipInlining = false;
1386 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1387 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1388 // compile a level 4 (C2) and then continue executing it.
1389 if (TieredCompilation) {
1390 Tier3InvokeNotifyFreqLog = 0;
1391 Tier4InvocationThreshold = 0;
1392 }
1393 break;
1394 }
1395 }
1396
1397 // Conflict: required to use shared spaces (-Xshare:on), but
1398 // incompatible command line options were chosen.
1399 static void no_shared_spaces(const char* message) {
1400 if (RequireSharedSpaces) {
1401 jio_fprintf(defaultStream::error_stream(),
1402 "Class data sharing is inconsistent with other specified options.\n");
1403 vm_exit_during_initialization("Unable to use shared archive.", message);
1404 } else {
1405 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1406 }
1407 }
1408
1409 // Returns threshold scaled with the value of scale.
1410 // If scale < 0.0, threshold is returned without scaling.
1411 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1412 if (scale == 1.0 || scale < 0.0) {
1413 return threshold;
1414 } else {
1415 return (intx)(threshold * scale);
1416 }
1417 }
1418
1419 // Returns freq_log scaled with the value of scale.
1420 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1421 // If scale < 0.0, freq_log is returned without scaling.
1422 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1423 // Check if scaling is necessary or if negative value was specified.
1424 if (scale == 1.0 || scale < 0.0) {
1425 return freq_log;
1426 }
1427 // Check values to avoid calculating log2 of 0.
1428 if (scale == 0.0 || freq_log == 0) {
1429 return 0;
1430 }
1431 // Determine the maximum notification frequency value currently supported.
1432 // The largest mask value that the interpreter/C1 can handle is
1433 // of length InvocationCounter::number_of_count_bits. Mask values are always
1434 // one bit shorter then the value of the notification frequency. Set
1435 // max_freq_bits accordingly.
1436 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1437 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1438 if (scaled_freq == 0) {
1439 // Return 0 right away to avoid calculating log2 of 0.
1440 return 0;
1441 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1442 return max_freq_bits;
1443 } else {
1444 return log2_intptr(scaled_freq);
1445 }
1446 }
1447
1448 void Arguments::set_tiered_flags() {
1449 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1450 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1451 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1452 }
1453 if (CompilationPolicyChoice < 2) {
1454 vm_exit_during_initialization(
1455 "Incompatible compilation policy selected", NULL);
1456 }
1457 // Increase the code cache size - tiered compiles a lot more.
1458 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1459 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1460 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1461 }
1462 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1463 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1464 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1465 }
1466 if (!UseInterpreter) { // -Xcomp
1467 Tier3InvokeNotifyFreqLog = 0;
1468 Tier4InvocationThreshold = 0;
1469 }
1470
1471 if (CompileThresholdScaling < 0) {
1472 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1473 }
1474
1475 // Scale tiered compilation thresholds.
1476 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1477 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1478 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1479 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1480
1481 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1482 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1483 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1484 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1485
1486 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1487 // once these thresholds become supported.
1488
1489 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1490 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1491
1492 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1493 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1494
1495 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1496
1497 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1498 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1499 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1500 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1501 }
1502 }
1503
1504 #if INCLUDE_ALL_GCS
1505 static void disable_adaptive_size_policy(const char* collector_name) {
1506 if (UseAdaptiveSizePolicy) {
1507 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1508 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1509 collector_name);
1510 }
1511 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1512 }
1513 }
1514
1515 void Arguments::set_parnew_gc_flags() {
1516 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1517 "control point invariant");
1518 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1519
1520 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1521 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1522 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1523 } else if (ParallelGCThreads == 0) {
1524 jio_fprintf(defaultStream::error_stream(),
1525 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1526 vm_exit(1);
1527 }
1528
1529 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1530 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1531 // we set them to 1024 and 1024.
1532 // See CR 6362902.
1533 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1534 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1535 }
1536 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1537 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1538 }
1539
1540 // When using compressed oops, we use local overflow stacks,
1541 // rather than using a global overflow list chained through
1542 // the klass word of the object's pre-image.
1543 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1544 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1545 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1546 }
1547 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1548 }
1549 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1550 }
1551
1552 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1553 // sparc/solaris for certain applications, but would gain from
1554 // further optimization and tuning efforts, and would almost
1555 // certainly gain from analysis of platform and environment.
1556 void Arguments::set_cms_and_parnew_gc_flags() {
1557 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1558 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1559
1560 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1561 disable_adaptive_size_policy("UseConcMarkSweepGC");
1562
1563 set_parnew_gc_flags();
1564
1565 size_t max_heap = align_down(MaxHeapSize,
1566 CardTableRS::ct_max_alignment_constraint());
1567
1568 // Now make adjustments for CMS
1569 intx tenuring_default = (intx)6;
1570 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1571
1572 // Preferred young gen size for "short" pauses:
1573 // upper bound depends on # of threads and NewRatio.
1574 const size_t preferred_max_new_size_unaligned =
1575 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1576 size_t preferred_max_new_size =
1577 align_up(preferred_max_new_size_unaligned, os::vm_page_size());
1578
1579 // Unless explicitly requested otherwise, size young gen
1580 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1581
1582 // If either MaxNewSize or NewRatio is set on the command line,
1583 // assume the user is trying to set the size of the young gen.
1584 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1585
1586 // Set MaxNewSize to our calculated preferred_max_new_size unless
1587 // NewSize was set on the command line and it is larger than
1588 // preferred_max_new_size.
1589 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1590 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1591 } else {
1592 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1593 }
1594 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1595
1596 // Code along this path potentially sets NewSize and OldSize
1597 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1598 min_heap_size(), InitialHeapSize, max_heap);
1599 size_t min_new = preferred_max_new_size;
1600 if (FLAG_IS_CMDLINE(NewSize)) {
1601 min_new = NewSize;
1602 }
1603 if (max_heap > min_new && min_heap_size() > min_new) {
1604 // Unless explicitly requested otherwise, make young gen
1605 // at least min_new, and at most preferred_max_new_size.
1606 if (FLAG_IS_DEFAULT(NewSize)) {
1607 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1608 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1609 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1610 }
1611 // Unless explicitly requested otherwise, size old gen
1612 // so it's NewRatio x of NewSize.
1613 if (FLAG_IS_DEFAULT(OldSize)) {
1614 if (max_heap > NewSize) {
1615 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1616 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1617 }
1618 }
1619 }
1620 }
1621 // Unless explicitly requested otherwise, definitely
1622 // promote all objects surviving "tenuring_default" scavenges.
1623 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1624 FLAG_IS_DEFAULT(SurvivorRatio)) {
1625 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1626 }
1627 // If we decided above (or user explicitly requested)
1628 // `promote all' (via MaxTenuringThreshold := 0),
1629 // prefer minuscule survivor spaces so as not to waste
1630 // space for (non-existent) survivors
1631 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1632 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1633 }
1634
1635 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1636 // but rather the number of free blocks of a given size that are used when
1637 // replenishing the local per-worker free list caches.
1638 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1639 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1640 // OldPLAB sizing manually turned off: Use a larger default setting,
1641 // unless it was manually specified. This is because a too-low value
1642 // will slow down scavenges.
1643 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1644 } else {
1645 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1646 }
1647 }
1648
1649 // If either of the static initialization defaults have changed, note this
1650 // modification.
1651 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1652 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1653 }
1654
1655 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1656 }
1657 #endif // INCLUDE_ALL_GCS
1658
1659 void set_object_alignment() {
1660 // Object alignment.
1661 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1662 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1663 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1664 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1665 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1666 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1667
1668 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1669 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1670
1671 // Oop encoding heap max
1672 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1673
1674 if (SurvivorAlignmentInBytes == 0) {
1675 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1676 }
1677
1678 #if INCLUDE_ALL_GCS
1679 // Set CMS global values
1680 CompactibleFreeListSpace::set_cms_values();
1681 #endif // INCLUDE_ALL_GCS
1682 }
1683
1684 size_t Arguments::max_heap_for_compressed_oops() {
1685 // Avoid sign flip.
1686 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1687 // We need to fit both the NULL page and the heap into the memory budget, while
1688 // keeping alignment constraints of the heap. To guarantee the latter, as the
1689 // NULL page is located before the heap, we pad the NULL page to the conservative
1690 // maximum alignment that the GC may ever impose upon the heap.
1691 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1692 _conservative_max_heap_alignment);
1693
1694 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1695 NOT_LP64(ShouldNotReachHere(); return 0);
1696 }
1697
1698 void Arguments::set_use_compressed_oops() {
1699 #ifndef ZERO
1700 #ifdef _LP64
1701 // MaxHeapSize is not set up properly at this point, but
1702 // the only value that can override MaxHeapSize if we are
1703 // to use UseCompressedOops is InitialHeapSize.
1704 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1705
1706 if (max_heap_size <= max_heap_for_compressed_oops()) {
1707 #if !defined(COMPILER1) || defined(TIERED)
1708 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1709 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1710 }
1711 #endif
1712 } else {
1713 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1714 warning("Max heap size too large for Compressed Oops");
1715 FLAG_SET_DEFAULT(UseCompressedOops, false);
1716 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1717 }
1718 }
1719 #endif // _LP64
1720 #endif // ZERO
1721 }
1722
1723
1724 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1725 // set_use_compressed_oops().
1726 void Arguments::set_use_compressed_klass_ptrs() {
1727 #ifndef ZERO
1728 #ifdef _LP64
1729 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1730 if (!UseCompressedOops) {
1731 if (UseCompressedClassPointers) {
1732 warning("UseCompressedClassPointers requires UseCompressedOops");
1733 }
1734 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1735 } else {
1736 // Turn on UseCompressedClassPointers too
1737 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1738 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1739 }
1740 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1741 if (UseCompressedClassPointers) {
1742 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1743 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1744 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1745 }
1746 }
1747 }
1748 #endif // _LP64
1749 #endif // !ZERO
1750 }
1751
1752 void Arguments::set_conservative_max_heap_alignment() {
1753 // The conservative maximum required alignment for the heap is the maximum of
1754 // the alignments imposed by several sources: any requirements from the heap
1755 // itself, the collector policy and the maximum page size we may run the VM
1756 // with.
1757 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1758 #if INCLUDE_ALL_GCS
1759 if (UseParallelGC) {
1760 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1761 } else if (UseG1GC) {
1762 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1763 }
1764 #endif // INCLUDE_ALL_GCS
1765 _conservative_max_heap_alignment = MAX4(heap_alignment,
1766 (size_t)os::vm_allocation_granularity(),
1767 os::max_page_size(),
1768 CollectorPolicy::compute_heap_alignment());
1769 }
1770
1771 bool Arguments::gc_selected() {
1772 #if INCLUDE_ALL_GCS
1773 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1774 #else
1775 return UseSerialGC;
1776 #endif // INCLUDE_ALL_GCS
1777 }
1778
1779 #ifdef TIERED
1780 bool Arguments::compilation_mode_selected() {
1781 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1782 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1783
1784 }
1785
1786 void Arguments::select_compilation_mode_ergonomically() {
1787 #if defined(_WINDOWS) && !defined(_LP64)
1788 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1789 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1790 }
1791 #endif
1792 if (NeverActAsServerClassMachine) {
1793 set_client_compilation_mode();
1794 }
1795 }
1796 #endif //TIERED
1797
1798 void Arguments::select_gc_ergonomically() {
1799 #if INCLUDE_ALL_GCS
1800 if (os::is_server_class_machine()) {
1801 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1802 } else {
1803 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1804 }
1805 #else
1806 UNSUPPORTED_OPTION(UseG1GC);
1807 UNSUPPORTED_OPTION(UseParallelGC);
1808 UNSUPPORTED_OPTION(UseParallelOldGC);
1809 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1810 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1811 #endif // INCLUDE_ALL_GCS
1812 }
1813
1814 void Arguments::select_gc() {
1815 if (!gc_selected()) {
1816 select_gc_ergonomically();
1817 if (!gc_selected()) {
1818 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1819 }
1820 }
1821 }
1822
1823 #if INCLUDE_JVMCI
1824 void Arguments::set_jvmci_specific_flags() {
1825 if (UseJVMCICompiler) {
1826 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1827 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1828 }
1829 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1830 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1831 }
1832 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1833 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1834 }
1835 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1836 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1837 }
1838 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1839 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1840 }
1841 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1842 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1843 }
1844 if (TieredStopAtLevel != CompLevel_full_optimization) {
1845 // Currently JVMCI compiler can only work at the full optimization level
1846 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1847 TieredStopAtLevel = CompLevel_full_optimization;
1848 }
1849 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1850 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1851 }
1852 }
1853 }
1854 #endif
1855
1856 void Arguments::set_ergonomics_flags() {
1857 #ifdef TIERED
1858 if (!compilation_mode_selected()) {
1859 select_compilation_mode_ergonomically();
1860 }
1861 #endif
1862 select_gc();
1863
1864 #if defined(COMPILER2) || INCLUDE_JVMCI
1865 // Shared spaces work fine with other GCs but causes bytecode rewriting
1866 // to be disabled, which hurts interpreter performance and decreases
1867 // server performance. When -server is specified, keep the default off
1868 // unless it is asked for. Future work: either add bytecode rewriting
1869 // at link time, or rewrite bytecodes in non-shared methods.
1870 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1871 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1872 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1873 }
1874 #endif
1875
1876 set_conservative_max_heap_alignment();
1877
1878 #ifndef ZERO
1879 #ifdef _LP64
1880 set_use_compressed_oops();
1881
1882 // set_use_compressed_klass_ptrs() must be called after calling
1883 // set_use_compressed_oops().
1884 set_use_compressed_klass_ptrs();
1885
1886 // Also checks that certain machines are slower with compressed oops
1887 // in vm_version initialization code.
1888 #endif // _LP64
1889 #endif // !ZERO
1890
1891 }
1892
1893 void Arguments::set_parallel_gc_flags() {
1894 assert(UseParallelGC || UseParallelOldGC, "Error");
1895 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1896 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1897 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1898 }
1899 FLAG_SET_DEFAULT(UseParallelGC, true);
1900
1901 // If no heap maximum was requested explicitly, use some reasonable fraction
1902 // of the physical memory, up to a maximum of 1GB.
1903 FLAG_SET_DEFAULT(ParallelGCThreads,
1904 Abstract_VM_Version::parallel_worker_threads());
1905 if (ParallelGCThreads == 0) {
1906 jio_fprintf(defaultStream::error_stream(),
1907 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1908 vm_exit(1);
1909 }
1910
1911 if (UseAdaptiveSizePolicy) {
1912 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1913 // unless the user actually sets these flags.
1914 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1915 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1916 }
1917 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1918 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1919 }
1920 }
1921
1922 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1923 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1924 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1925 // See CR 6362902 for details.
1926 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1927 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1928 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1929 }
1930 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1931 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1932 }
1933 }
1934
1935 if (UseParallelOldGC) {
1936 // Par compact uses lower default values since they are treated as
1937 // minimums. These are different defaults because of the different
1938 // interpretation and are not ergonomically set.
1939 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1940 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1941 }
1942 }
1943 }
1944
1945 void Arguments::set_g1_gc_flags() {
1946 assert(UseG1GC, "Error");
1947 #if defined(COMPILER1) || INCLUDE_JVMCI
1948 FastTLABRefill = false;
1949 #endif
1950 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1951 if (ParallelGCThreads == 0) {
1952 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1953 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1954 }
1955
1956 #if INCLUDE_ALL_GCS
1957 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1958 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1959 }
1960 #endif
1961
1962 // MarkStackSize will be set (if it hasn't been set by the user)
1963 // when concurrent marking is initialized.
1964 // Its value will be based upon the number of parallel marking threads.
1965 // But we do set the maximum mark stack size here.
1966 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1967 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1968 }
1969
1970 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1971 // In G1, we want the default GC overhead goal to be higher than
1972 // it is for PS, or the heap might be expanded too aggressively.
1973 // We set it here to ~8%.
1974 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1975 }
1976
1977 // Below, we might need to calculate the pause time interval based on
1978 // the pause target. When we do so we are going to give G1 maximum
1979 // flexibility and allow it to do pauses when it needs to. So, we'll
1980 // arrange that the pause interval to be pause time target + 1 to
1981 // ensure that a) the pause time target is maximized with respect to
1982 // the pause interval and b) we maintain the invariant that pause
1983 // time target < pause interval. If the user does not want this
1984 // maximum flexibility, they will have to set the pause interval
1985 // explicitly.
1986
1987 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1988 // The default pause time target in G1 is 200ms
1989 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1990 }
1991
1992 // Then, if the interval parameter was not set, set it according to
1993 // the pause time target (this will also deal with the case when the
1994 // pause time target is the default value).
1995 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1996 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1997 }
1998
1999 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
2000 }
2001
2002 void Arguments::set_gc_specific_flags() {
2003 #if INCLUDE_ALL_GCS
2004 // Set per-collector flags
2005 if (UseParallelGC || UseParallelOldGC) {
2006 set_parallel_gc_flags();
2007 } else if (UseConcMarkSweepGC) {
2008 set_cms_and_parnew_gc_flags();
2009 } else if (UseG1GC) {
2010 set_g1_gc_flags();
2011 }
2012 if (AssumeMP && !UseSerialGC) {
2013 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2014 warning("If the number of processors is expected to increase from one, then"
2015 " you should configure the number of parallel GC threads appropriately"
2016 " using -XX:ParallelGCThreads=N");
2017 }
2018 }
2019 if (MinHeapFreeRatio == 100) {
2020 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2021 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2022 }
2023
2024 // If class unloading is disabled, also disable concurrent class unloading.
2025 if (!ClassUnloading) {
2026 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2027 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2028 }
2029 #endif // INCLUDE_ALL_GCS
2030 }
2031
2032 julong Arguments::limit_by_allocatable_memory(julong limit) {
2033 julong max_allocatable;
2034 julong result = limit;
2035 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2036 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2037 }
2038 return result;
2039 }
2040
2041 // Use static initialization to get the default before parsing
2042 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2043
2044 void Arguments::set_heap_size() {
2045 julong phys_mem =
2046 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2047 : (julong)MaxRAM;
2048
2049 // Experimental support for CGroup memory limits
2050 if (UseCGroupMemoryLimitForHeap) {
2051 // This is a rough indicator that a CGroup limit may be in force
2052 // for this process
2053 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
2054 FILE *fp = fopen(lim_file, "r");
2055 if (fp != NULL) {
2056 julong cgroup_max = 0;
2057 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2058 if (ret == 1 && cgroup_max > 0) {
2059 // If unlimited, cgroup_max will be a very large, but unspecified
2060 // value, so use initial phys_mem as a limit
2061 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
2062 JULONG_FORMAT "MB) and initial phys_mem ("
2063 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2064 phys_mem = MIN2(cgroup_max, phys_mem);
2065 } else {
2066 warning("Unable to read/parse cgroup memory limit from %s: %s",
2067 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2068 }
2069 fclose(fp);
2070 } else {
2071 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2072 }
2073 }
2074
2075 // Convert deprecated flags
2076 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
2077 !FLAG_IS_DEFAULT(MaxRAMFraction))
2078 MaxRAMPercentage = 100.0 / MaxRAMFraction;
2079
2080 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
2081 !FLAG_IS_DEFAULT(MinRAMFraction))
2082 MinRAMPercentage = 100.0 / MinRAMFraction;
2083
2084 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
2085 !FLAG_IS_DEFAULT(InitialRAMFraction))
2086 InitialRAMPercentage = 100.0 / InitialRAMFraction;
2087
2088 // If the maximum heap size has not been set with -Xmx,
2089 // then set it as fraction of the size of physical memory,
2090 // respecting the maximum and minimum sizes of the heap.
2091 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2092 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
2093 if (phys_mem <= (julong)((MaxHeapSize * MinRAMPercentage) / 100)) {
2094 // Small physical memory, so use a minimum fraction of it for the heap
2095 reasonable_max = (julong)((phys_mem * MinRAMPercentage) / 100);
2096 } else {
2097 // Not-small physical memory, so require a heap at least
2098 // as large as MaxHeapSize
2099 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2100 }
2101
2102 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2103 // Limit the heap size to ErgoHeapSizeLimit
2104 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2105 }
2106 if (UseCompressedOops) {
2107 // Limit the heap size to the maximum possible when using compressed oops
2108 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2109
2110 // HeapBaseMinAddress can be greater than default but not less than.
2111 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2112 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2113 // matches compressed oops printing flags
2114 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2115 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2116 DefaultHeapBaseMinAddress,
2117 DefaultHeapBaseMinAddress/G,
2118 HeapBaseMinAddress);
2119 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2120 }
2121 }
2122
2123 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2124 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2125 // but it should be not less than default MaxHeapSize.
2126 max_coop_heap -= HeapBaseMinAddress;
2127 }
2128 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2129 }
2130 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2131
2132 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2133 // An initial heap size was specified on the command line,
2134 // so be sure that the maximum size is consistent. Done
2135 // after call to limit_by_allocatable_memory because that
2136 // method might reduce the allocation size.
2137 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2138 }
2139
2140 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2141 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2142 }
2143
2144 // If the minimum or initial heap_size have not been set or requested to be set
2145 // ergonomically, set them accordingly.
2146 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2147 julong reasonable_minimum = (julong)(OldSize + NewSize);
2148
2149 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2150
2151 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2152
2153 if (InitialHeapSize == 0) {
2154 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
2155
2156 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2157 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2158
2159 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2160
2161 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2162 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2163 }
2164 // If the minimum heap size has not been set (via -Xms),
2165 // synchronize with InitialHeapSize to avoid errors with the default value.
2166 if (min_heap_size() == 0) {
2167 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2168 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2169 }
2170 }
2171 }
2172
2173 // This option inspects the machine and attempts to set various
2174 // parameters to be optimal for long-running, memory allocation
2175 // intensive jobs. It is intended for machines with large
2176 // amounts of cpu and memory.
2177 jint Arguments::set_aggressive_heap_flags() {
2178 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2179 // VM, but we may not be able to represent the total physical memory
2180 // available (like having 8gb of memory on a box but using a 32bit VM).
2181 // Thus, we need to make sure we're using a julong for intermediate
2182 // calculations.
2183 julong initHeapSize;
2184 julong total_memory = os::physical_memory();
2185
2186 if (total_memory < (julong) 256 * M) {
2187 jio_fprintf(defaultStream::error_stream(),
2188 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2189 vm_exit(1);
2190 }
2191
2192 // The heap size is half of available memory, or (at most)
2193 // all of possible memory less 160mb (leaving room for the OS
2194 // when using ISM). This is the maximum; because adaptive sizing
2195 // is turned on below, the actual space used may be smaller.
2196
2197 initHeapSize = MIN2(total_memory / (julong) 2,
2198 total_memory - (julong) 160 * M);
2199
2200 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2201
2202 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2203 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2204 return JNI_EINVAL;
2205 }
2206 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2207 return JNI_EINVAL;
2208 }
2209 // Currently the minimum size and the initial heap sizes are the same.
2210 set_min_heap_size(initHeapSize);
2211 }
2212 if (FLAG_IS_DEFAULT(NewSize)) {
2213 // Make the young generation 3/8ths of the total heap.
2214 if (FLAG_SET_CMDLINE(size_t, NewSize,
2215 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2216 return JNI_EINVAL;
2217 }
2218 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2219 return JNI_EINVAL;
2220 }
2221 }
2222
2223 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2224 FLAG_SET_DEFAULT(UseLargePages, true);
2225 #endif
2226
2227 // Increase some data structure sizes for efficiency
2228 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2229 return JNI_EINVAL;
2230 }
2231 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2232 return JNI_EINVAL;
2233 }
2234 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2235 return JNI_EINVAL;
2236 }
2237
2238 // See the OldPLABSize comment below, but replace 'after promotion'
2239 // with 'after copying'. YoungPLABSize is the size of the survivor
2240 // space per-gc-thread buffers. The default is 4kw.
2241 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2242 return JNI_EINVAL;
2243 }
2244
2245 // OldPLABSize is the size of the buffers in the old gen that
2246 // UseParallelGC uses to promote live data that doesn't fit in the
2247 // survivor spaces. At any given time, there's one for each gc thread.
2248 // The default size is 1kw. These buffers are rarely used, since the
2249 // survivor spaces are usually big enough. For specjbb, however, there
2250 // are occasions when there's lots of live data in the young gen
2251 // and we end up promoting some of it. We don't have a definite
2252 // explanation for why bumping OldPLABSize helps, but the theory
2253 // is that a bigger PLAB results in retaining something like the
2254 // original allocation order after promotion, which improves mutator
2255 // locality. A minor effect may be that larger PLABs reduce the
2256 // number of PLAB allocation events during gc. The value of 8kw
2257 // was arrived at by experimenting with specjbb.
2258 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2259 return JNI_EINVAL;
2260 }
2261
2262 // Enable parallel GC and adaptive generation sizing
2263 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2264 return JNI_EINVAL;
2265 }
2266
2267 // Encourage steady state memory management
2268 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2269 return JNI_EINVAL;
2270 }
2271
2272 // This appears to improve mutator locality
2273 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2274 return JNI_EINVAL;
2275 }
2276
2277 // Get around early Solaris scheduling bug
2278 // (affinity vs other jobs on system)
2279 // but disallow DR and offlining (5008695).
2280 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2281 return JNI_EINVAL;
2282 }
2283
2284 return JNI_OK;
2285 }
2286
2287 // This must be called after ergonomics.
2288 void Arguments::set_bytecode_flags() {
2289 if (!RewriteBytecodes) {
2290 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2291 }
2292 }
2293
2294 // Aggressive optimization flags -XX:+AggressiveOpts
2295 jint Arguments::set_aggressive_opts_flags() {
2296 #ifdef COMPILER2
2297 if (AggressiveUnboxing) {
2298 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2299 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2300 } else if (!EliminateAutoBox) {
2301 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2302 AggressiveUnboxing = false;
2303 }
2304 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2305 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2306 } else if (!DoEscapeAnalysis) {
2307 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2308 AggressiveUnboxing = false;
2309 }
2310 }
2311 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2312 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2313 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2314 }
2315 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2316 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2317 }
2318
2319 // Feed the cache size setting into the JDK
2320 char buffer[1024];
2321 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2322 if (!add_property(buffer)) {
2323 return JNI_ENOMEM;
2324 }
2325 }
2326 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2327 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2328 }
2329 #endif
2330
2331 if (AggressiveOpts) {
2332 // Sample flag setting code
2333 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2334 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2335 // }
2336 }
2337
2338 return JNI_OK;
2339 }
2340
2341 //===========================================================================================================
2342 // Parsing of java.compiler property
2343
2344 void Arguments::process_java_compiler_argument(const char* arg) {
2345 // For backwards compatibility, Djava.compiler=NONE or ""
2346 // causes us to switch to -Xint mode UNLESS -Xdebug
2347 // is also specified.
2348 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2349 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2350 }
2351 }
2352
2353 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2354 _sun_java_launcher = os::strdup_check_oom(launcher);
2355 }
2356
2357 bool Arguments::created_by_java_launcher() {
2358 assert(_sun_java_launcher != NULL, "property must have value");
2359 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2360 }
2361
2362 bool Arguments::sun_java_launcher_is_altjvm() {
2363 return _sun_java_launcher_is_altjvm;
2364 }
2365
2366 //===========================================================================================================
2367 // Parsing of main arguments
2368
2369 #if INCLUDE_JVMCI
2370 // Check consistency of jvmci vm argument settings.
2371 bool Arguments::check_jvmci_args_consistency() {
2372 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2373 }
2374 #endif //INCLUDE_JVMCI
2375
2376 // Check consistency of GC selection
2377 bool Arguments::check_gc_consistency() {
2378 // Ensure that the user has not selected conflicting sets
2379 // of collectors.
2380 uint i = 0;
2381 if (UseSerialGC) i++;
2382 if (UseConcMarkSweepGC) i++;
2383 if (UseParallelGC || UseParallelOldGC) i++;
2384 if (UseG1GC) i++;
2385 if (i > 1) {
2386 jio_fprintf(defaultStream::error_stream(),
2387 "Conflicting collector combinations in option list; "
2388 "please refer to the release notes for the combinations "
2389 "allowed\n");
2390 return false;
2391 }
2392
2393 return true;
2394 }
2395
2396 // Check the consistency of vm_init_args
2397 bool Arguments::check_vm_args_consistency() {
2398 // Method for adding checks for flag consistency.
2399 // The intent is to warn the user of all possible conflicts,
2400 // before returning an error.
2401 // Note: Needs platform-dependent factoring.
2402 bool status = true;
2403
2404 if (TLABRefillWasteFraction == 0) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "TLABRefillWasteFraction should be a denominator, "
2407 "not " SIZE_FORMAT "\n",
2408 TLABRefillWasteFraction);
2409 status = false;
2410 }
2411
2412 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2413 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2414 }
2415
2416 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2417 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2418 }
2419
2420 if (GCTimeLimit == 100) {
2421 // Turn off gc-overhead-limit-exceeded checks
2422 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2423 }
2424
2425 status = status && check_gc_consistency();
2426
2427 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2428 // insists that we hold the requisite locks so that the iteration is
2429 // MT-safe. For the verification at start-up and shut-down, we don't
2430 // yet have a good way of acquiring and releasing these locks,
2431 // which are not visible at the CollectedHeap level. We want to
2432 // be able to acquire these locks and then do the iteration rather
2433 // than just disable the lock verification. This will be fixed under
2434 // bug 4788986.
2435 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2436 if (VerifyDuringStartup) {
2437 warning("Heap verification at start-up disabled "
2438 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2439 VerifyDuringStartup = false; // Disable verification at start-up
2440 }
2441
2442 if (VerifyBeforeExit) {
2443 warning("Heap verification at shutdown disabled "
2444 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2445 VerifyBeforeExit = false; // Disable verification at shutdown
2446 }
2447 }
2448
2449 if (PrintNMTStatistics) {
2450 #if INCLUDE_NMT
2451 if (MemTracker::tracking_level() == NMT_off) {
2452 #endif // INCLUDE_NMT
2453 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2454 PrintNMTStatistics = false;
2455 #if INCLUDE_NMT
2456 }
2457 #endif
2458 }
2459
2460 #if INCLUDE_JVMCI
2461 status = status && check_jvmci_args_consistency();
2462
2463 if (EnableJVMCI) {
2464 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2465 AddProperty, UnwriteableProperty, InternalProperty);
2466
2467 if (!ScavengeRootsInCode) {
2468 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2469 ScavengeRootsInCode = 1;
2470 }
2471 }
2472 #endif
2473
2474 // Check lower bounds of the code cache
2475 // Template Interpreter code is approximately 3X larger in debug builds.
2476 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2477 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2480 os::vm_page_size()/K);
2481 status = false;
2482 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2485 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2486 status = false;
2487 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2490 min_code_cache_size/K);
2491 status = false;
2492 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2493 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2494 jio_fprintf(defaultStream::error_stream(),
2495 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2496 CODE_CACHE_SIZE_LIMIT/M);
2497 status = false;
2498 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2499 jio_fprintf(defaultStream::error_stream(),
2500 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2501 min_code_cache_size/K);
2502 status = false;
2503 }
2504
2505 #ifdef _LP64
2506 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2507 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2508 }
2509 #endif
2510
2511 #ifndef SUPPORT_RESERVED_STACK_AREA
2512 if (StackReservedPages != 0) {
2513 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2514 warning("Reserved Stack Area not supported on this platform");
2515 }
2516 #endif
2517
2518 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2519 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2520 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2521 }
2522 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2523 }
2524 if (UseCompiler && is_interpreter_only()) {
2525 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2526 warning("UseCompiler disabled due to -Xint.");
2527 }
2528 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2529 }
2530 #ifdef COMPILER2
2531 if (PostLoopMultiversioning && !RangeCheckElimination) {
2532 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2533 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2534 }
2535 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2536 }
2537 #endif
2538 return status;
2539 }
2540
2541 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2542 const char* option_type) {
2543 if (ignore) return false;
2544
2545 const char* spacer = " ";
2546 if (option_type == NULL) {
2547 option_type = ++spacer; // Set both to the empty string.
2548 }
2549
2550 if (os::obsolete_option(option)) {
2551 jio_fprintf(defaultStream::error_stream(),
2552 "Obsolete %s%soption: %s\n", option_type, spacer,
2553 option->optionString);
2554 return false;
2555 } else {
2556 jio_fprintf(defaultStream::error_stream(),
2557 "Unrecognized %s%soption: %s\n", option_type, spacer,
2558 option->optionString);
2559 return true;
2560 }
2561 }
2562
2563 static const char* user_assertion_options[] = {
2564 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2565 };
2566
2567 static const char* system_assertion_options[] = {
2568 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2569 };
2570
2571 bool Arguments::parse_uintx(const char* value,
2572 uintx* uintx_arg,
2573 uintx min_size) {
2574
2575 // Check the sign first since atojulong() parses only unsigned values.
2576 bool value_is_positive = !(*value == '-');
2577
2578 if (value_is_positive) {
2579 julong n;
2580 bool good_return = atojulong(value, &n);
2581 if (good_return) {
2582 bool above_minimum = n >= min_size;
2583 bool value_is_too_large = n > max_uintx;
2584
2585 if (above_minimum && !value_is_too_large) {
2586 *uintx_arg = n;
2587 return true;
2588 }
2589 }
2590 }
2591 return false;
2592 }
2593
2594 unsigned int addreads_count = 0;
2595 unsigned int addexports_count = 0;
2596 unsigned int addopens_count = 0;
2597 unsigned int addmods_count = 0;
2598 unsigned int patch_mod_count = 0;
2599
2600 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2601 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2602 char* property = AllocateHeap(prop_len, mtArguments);
2603 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2604 if (ret < 0 || ret >= (int)prop_len) {
2605 FreeHeap(property);
2606 return false;
2607 }
2608 bool added = add_property(property, UnwriteableProperty, internal);
2609 FreeHeap(property);
2610 return added;
2611 }
2612
2613 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2614 const unsigned int props_count_limit = 1000;
2615 const int max_digits = 3;
2616 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2617
2618 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2619 if (count < props_count_limit) {
2620 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2621 char* property = AllocateHeap(prop_len, mtArguments);
2622 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2623 if (ret < 0 || ret >= (int)prop_len) {
2624 FreeHeap(property);
2625 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2626 return false;
2627 }
2628 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2629 FreeHeap(property);
2630 return added;
2631 }
2632
2633 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2634 return false;
2635 }
2636
2637 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2638 julong* long_arg,
2639 julong min_size,
2640 julong max_size) {
2641 if (!atojulong(s, long_arg)) return arg_unreadable;
2642 return check_memory_size(*long_arg, min_size, max_size);
2643 }
2644
2645 // Parse JavaVMInitArgs structure
2646
2647 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2648 const JavaVMInitArgs *java_options_args,
2649 const JavaVMInitArgs *cmd_line_args) {
2650 bool patch_mod_javabase = false;
2651
2652 // Save default settings for some mode flags
2653 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2654 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2655 Arguments::_ClipInlining = ClipInlining;
2656 Arguments::_BackgroundCompilation = BackgroundCompilation;
2657 if (TieredCompilation) {
2658 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2659 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2660 }
2661
2662 // Setup flags for mixed which is the default
2663 set_mode_flags(_mixed);
2664
2665 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2666 // variable (if present).
2667 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2668 if (result != JNI_OK) {
2669 return result;
2670 }
2671
2672 // Parse args structure generated from the command line flags.
2673 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2674 if (result != JNI_OK) {
2675 return result;
2676 }
2677
2678 // Parse args structure generated from the _JAVA_OPTIONS environment
2679 // variable (if present) (mimics classic VM)
2680 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2681 if (result != JNI_OK) {
2682 return result;
2683 }
2684
2685 // Do final processing now that all arguments have been parsed
2686 result = finalize_vm_init_args();
2687 if (result != JNI_OK) {
2688 return result;
2689 }
2690
2691 #if INCLUDE_CDS
2692 if (UseSharedSpaces && patch_mod_javabase) {
2693 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2694 }
2695 #endif
2696
2697 return JNI_OK;
2698 }
2699
2700 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2701 // represents a valid JDWP agent. is_path==true denotes that we
2702 // are dealing with -agentpath (case where name is a path), otherwise with
2703 // -agentlib
2704 bool valid_jdwp_agent(char *name, bool is_path) {
2705 char *_name;
2706 const char *_jdwp = "jdwp";
2707 size_t _len_jdwp, _len_prefix;
2708
2709 if (is_path) {
2710 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2711 return false;
2712 }
2713
2714 _name++; // skip past last path separator
2715 _len_prefix = strlen(JNI_LIB_PREFIX);
2716
2717 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2718 return false;
2719 }
2720
2721 _name += _len_prefix;
2722 _len_jdwp = strlen(_jdwp);
2723
2724 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2725 _name += _len_jdwp;
2726 }
2727 else {
2728 return false;
2729 }
2730
2731 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2732 return false;
2733 }
2734
2735 return true;
2736 }
2737
2738 if (strcmp(name, _jdwp) == 0) {
2739 return true;
2740 }
2741
2742 return false;
2743 }
2744
2745 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2746 // --patch-module=<module>=<file>(<pathsep><file>)*
2747 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2748 // Find the equal sign between the module name and the path specification
2749 const char* module_equal = strchr(patch_mod_tail, '=');
2750 if (module_equal == NULL) {
2751 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2752 return JNI_ERR;
2753 } else {
2754 // Pick out the module name
2755 size_t module_len = module_equal - patch_mod_tail;
2756 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2757 if (module_name != NULL) {
2758 memcpy(module_name, patch_mod_tail, module_len);
2759 *(module_name + module_len) = '\0';
2760 // The path piece begins one past the module_equal sign
2761 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2762 FREE_C_HEAP_ARRAY(char, module_name);
2763 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2764 return JNI_ENOMEM;
2765 }
2766 } else {
2767 return JNI_ENOMEM;
2768 }
2769 }
2770 return JNI_OK;
2771 }
2772
2773 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2774 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2775 // The min and max sizes match the values in globals.hpp, but scaled
2776 // with K. The values have been chosen so that alignment with page
2777 // size doesn't change the max value, which makes the conversions
2778 // back and forth between Xss value and ThreadStackSize value easier.
2779 // The values have also been chosen to fit inside a 32-bit signed type.
2780 const julong min_ThreadStackSize = 0;
2781 const julong max_ThreadStackSize = 1 * M;
2782
2783 const julong min_size = min_ThreadStackSize * K;
2784 const julong max_size = max_ThreadStackSize * K;
2785
2786 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2787
2788 julong size = 0;
2789 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2790 if (errcode != arg_in_range) {
2791 bool silent = (option == NULL); // Allow testing to silence error messages
2792 if (!silent) {
2793 jio_fprintf(defaultStream::error_stream(),
2794 "Invalid thread stack size: %s\n", option->optionString);
2795 describe_range_error(errcode);
2796 }
2797 return JNI_EINVAL;
2798 }
2799
2800 // Internally track ThreadStackSize in units of 1024 bytes.
2801 const julong size_aligned = align_up(size, K);
2802 assert(size <= size_aligned,
2803 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2804 size, size_aligned);
2805
2806 const julong size_in_K = size_aligned / K;
2807 assert(size_in_K < (julong)max_intx,
2808 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2809 size_in_K);
2810
2811 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2812 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2813 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2814 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2815 max_expanded, size_in_K);
2816
2817 *out_ThreadStackSize = (intx)size_in_K;
2818
2819 return JNI_OK;
2820 }
2821
2822 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2823 // For match_option to return remaining or value part of option string
2824 const char* tail;
2825
2826 // iterate over arguments
2827 for (int index = 0; index < args->nOptions; index++) {
2828 bool is_absolute_path = false; // for -agentpath vs -agentlib
2829
2830 const JavaVMOption* option = args->options + index;
2831
2832 if (!match_option(option, "-Djava.class.path", &tail) &&
2833 !match_option(option, "-Dsun.java.command", &tail) &&
2834 !match_option(option, "-Dsun.java.launcher", &tail)) {
2835
2836 // add all jvm options to the jvm_args string. This string
2837 // is used later to set the java.vm.args PerfData string constant.
2838 // the -Djava.class.path and the -Dsun.java.command options are
2839 // omitted from jvm_args string as each have their own PerfData
2840 // string constant object.
2841 build_jvm_args(option->optionString);
2842 }
2843
2844 // -verbose:[class/module/gc/jni]
2845 if (match_option(option, "-verbose", &tail)) {
2846 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2847 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2848 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2849 } else if (!strcmp(tail, ":module")) {
2850 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2851 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2852 } else if (!strcmp(tail, ":gc")) {
2853 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2854 } else if (!strcmp(tail, ":jni")) {
2855 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2856 return JNI_EINVAL;
2857 }
2858 }
2859 // -da / -ea / -disableassertions / -enableassertions
2860 // These accept an optional class/package name separated by a colon, e.g.,
2861 // -da:java.lang.Thread.
2862 } else if (match_option(option, user_assertion_options, &tail, true)) {
2863 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2864 if (*tail == '\0') {
2865 JavaAssertions::setUserClassDefault(enable);
2866 } else {
2867 assert(*tail == ':', "bogus match by match_option()");
2868 JavaAssertions::addOption(tail + 1, enable);
2869 }
2870 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2871 } else if (match_option(option, system_assertion_options, &tail, false)) {
2872 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2873 JavaAssertions::setSystemClassDefault(enable);
2874 // -bootclasspath:
2875 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2876 jio_fprintf(defaultStream::output_stream(),
2877 "-Xbootclasspath is no longer a supported option.\n");
2878 return JNI_EINVAL;
2879 // -bootclasspath/a:
2880 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2881 Arguments::append_sysclasspath(tail);
2882 // -bootclasspath/p:
2883 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2884 jio_fprintf(defaultStream::output_stream(),
2885 "-Xbootclasspath/p is no longer a supported option.\n");
2886 return JNI_EINVAL;
2887 // -Xrun
2888 } else if (match_option(option, "-Xrun", &tail)) {
2889 if (tail != NULL) {
2890 const char* pos = strchr(tail, ':');
2891 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2892 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2893 jio_snprintf(name, len + 1, "%s", tail);
2894
2895 char *options = NULL;
2896 if(pos != NULL) {
2897 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2898 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2899 }
2900 #if !INCLUDE_JVMTI
2901 if (strcmp(name, "jdwp") == 0) {
2902 jio_fprintf(defaultStream::error_stream(),
2903 "Debugging agents are not supported in this VM\n");
2904 return JNI_ERR;
2905 }
2906 #endif // !INCLUDE_JVMTI
2907 add_init_library(name, options);
2908 }
2909 } else if (match_option(option, "--add-reads=", &tail)) {
2910 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2911 return JNI_ENOMEM;
2912 }
2913 } else if (match_option(option, "--add-exports=", &tail)) {
2914 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2915 return JNI_ENOMEM;
2916 }
2917 } else if (match_option(option, "--add-opens=", &tail)) {
2918 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2919 return JNI_ENOMEM;
2920 }
2921 } else if (match_option(option, "--add-modules=", &tail)) {
2922 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2923 return JNI_ENOMEM;
2924 }
2925 } else if (match_option(option, "--limit-modules=", &tail)) {
2926 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2927 return JNI_ENOMEM;
2928 }
2929 } else if (match_option(option, "--module-path=", &tail)) {
2930 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2931 return JNI_ENOMEM;
2932 }
2933 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2934 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2935 return JNI_ENOMEM;
2936 }
2937 } else if (match_option(option, "--patch-module=", &tail)) {
2938 // --patch-module=<module>=<file>(<pathsep><file>)*
2939 int res = process_patch_mod_option(tail, patch_mod_javabase);
2940 if (res != JNI_OK) {
2941 return res;
2942 }
2943 } else if (match_option(option, "--illegal-access=", &tail)) {
2944 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2945 return JNI_ENOMEM;
2946 }
2947 // -agentlib and -agentpath
2948 } else if (match_option(option, "-agentlib:", &tail) ||
2949 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2950 if(tail != NULL) {
2951 const char* pos = strchr(tail, '=');
2952 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2953 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2954 name[len] = '\0';
2955
2956 char *options = NULL;
2957 if(pos != NULL) {
2958 options = os::strdup_check_oom(pos + 1, mtArguments);
2959 }
2960 #if !INCLUDE_JVMTI
2961 if (valid_jdwp_agent(name, is_absolute_path)) {
2962 jio_fprintf(defaultStream::error_stream(),
2963 "Debugging agents are not supported in this VM\n");
2964 return JNI_ERR;
2965 }
2966 #endif // !INCLUDE_JVMTI
2967 add_init_agent(name, options, is_absolute_path);
2968 }
2969 // -javaagent
2970 } else if (match_option(option, "-javaagent:", &tail)) {
2971 #if !INCLUDE_JVMTI
2972 jio_fprintf(defaultStream::error_stream(),
2973 "Instrumentation agents are not supported in this VM\n");
2974 return JNI_ERR;
2975 #else
2976 if (tail != NULL) {
2977 size_t length = strlen(tail) + 1;
2978 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2979 jio_snprintf(options, length, "%s", tail);
2980 add_init_agent("instrument", options, false);
2981 // java agents need module java.instrument
2982 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2983 return JNI_ENOMEM;
2984 }
2985 }
2986 #endif // !INCLUDE_JVMTI
2987 // -Xnoclassgc
2988 } else if (match_option(option, "-Xnoclassgc")) {
2989 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992 // -Xconcgc
2993 } else if (match_option(option, "-Xconcgc")) {
2994 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2995 return JNI_EINVAL;
2996 }
2997 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2998 // -Xnoconcgc
2999 } else if (match_option(option, "-Xnoconcgc")) {
3000 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
3004 // -Xbatch
3005 } else if (match_option(option, "-Xbatch")) {
3006 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3007 return JNI_EINVAL;
3008 }
3009 // -Xmn for compatibility with other JVM vendors
3010 } else if (match_option(option, "-Xmn", &tail)) {
3011 julong long_initial_young_size = 0;
3012 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
3013 if (errcode != arg_in_range) {
3014 jio_fprintf(defaultStream::error_stream(),
3015 "Invalid initial young generation size: %s\n", option->optionString);
3016 describe_range_error(errcode);
3017 return JNI_EINVAL;
3018 }
3019 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3020 return JNI_EINVAL;
3021 }
3022 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
3023 return JNI_EINVAL;
3024 }
3025 // -Xms
3026 } else if (match_option(option, "-Xms", &tail)) {
3027 julong long_initial_heap_size = 0;
3028 // an initial heap size of 0 means automatically determine
3029 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3030 if (errcode != arg_in_range) {
3031 jio_fprintf(defaultStream::error_stream(),
3032 "Invalid initial heap size: %s\n", option->optionString);
3033 describe_range_error(errcode);
3034 return JNI_EINVAL;
3035 }
3036 set_min_heap_size((size_t)long_initial_heap_size);
3037 // Currently the minimum size and the initial heap sizes are the same.
3038 // Can be overridden with -XX:InitialHeapSize.
3039 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
3040 return JNI_EINVAL;
3041 }
3042 // -Xmx
3043 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3044 julong long_max_heap_size = 0;
3045 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3046 if (errcode != arg_in_range) {
3047 jio_fprintf(defaultStream::error_stream(),
3048 "Invalid maximum heap size: %s\n", option->optionString);
3049 describe_range_error(errcode);
3050 return JNI_EINVAL;
3051 }
3052 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
3053 return JNI_EINVAL;
3054 }
3055 // Xmaxf
3056 } else if (match_option(option, "-Xmaxf", &tail)) {
3057 char* err;
3058 int maxf = (int)(strtod(tail, &err) * 100);
3059 if (*err != '\0' || *tail == '\0') {
3060 jio_fprintf(defaultStream::error_stream(),
3061 "Bad max heap free percentage size: %s\n",
3062 option->optionString);
3063 return JNI_EINVAL;
3064 } else {
3065 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 }
3069 // Xminf
3070 } else if (match_option(option, "-Xminf", &tail)) {
3071 char* err;
3072 int minf = (int)(strtod(tail, &err) * 100);
3073 if (*err != '\0' || *tail == '\0') {
3074 jio_fprintf(defaultStream::error_stream(),
3075 "Bad min heap free percentage size: %s\n",
3076 option->optionString);
3077 return JNI_EINVAL;
3078 } else {
3079 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3080 return JNI_EINVAL;
3081 }
3082 }
3083 // -Xss
3084 } else if (match_option(option, "-Xss", &tail)) {
3085 intx value = 0;
3086 jint err = parse_xss(option, tail, &value);
3087 if (err != JNI_OK) {
3088 return err;
3089 }
3090 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
3091 return JNI_EINVAL;
3092 }
3093 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3094 julong long_CodeCacheExpansionSize = 0;
3095 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3096 if (errcode != arg_in_range) {
3097 jio_fprintf(defaultStream::error_stream(),
3098 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3099 os::vm_page_size()/K);
3100 return JNI_EINVAL;
3101 }
3102 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3103 return JNI_EINVAL;
3104 }
3105 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3106 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3107 julong long_ReservedCodeCacheSize = 0;
3108
3109 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3110 if (errcode != arg_in_range) {
3111 jio_fprintf(defaultStream::error_stream(),
3112 "Invalid maximum code cache size: %s.\n", option->optionString);
3113 return JNI_EINVAL;
3114 }
3115 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3116 return JNI_EINVAL;
3117 }
3118 // -XX:NonNMethodCodeHeapSize=
3119 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3120 julong long_NonNMethodCodeHeapSize = 0;
3121
3122 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3123 if (errcode != arg_in_range) {
3124 jio_fprintf(defaultStream::error_stream(),
3125 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3126 return JNI_EINVAL;
3127 }
3128 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3129 return JNI_EINVAL;
3130 }
3131 // -XX:ProfiledCodeHeapSize=
3132 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3133 julong long_ProfiledCodeHeapSize = 0;
3134
3135 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3136 if (errcode != arg_in_range) {
3137 jio_fprintf(defaultStream::error_stream(),
3138 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3139 return JNI_EINVAL;
3140 }
3141 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3142 return JNI_EINVAL;
3143 }
3144 // -XX:NonProfiledCodeHeapSizee=
3145 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3146 julong long_NonProfiledCodeHeapSize = 0;
3147
3148 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3149 if (errcode != arg_in_range) {
3150 jio_fprintf(defaultStream::error_stream(),
3151 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3152 return JNI_EINVAL;
3153 }
3154 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3155 return JNI_EINVAL;
3156 }
3157 // -green
3158 } else if (match_option(option, "-green")) {
3159 jio_fprintf(defaultStream::error_stream(),
3160 "Green threads support not available\n");
3161 return JNI_EINVAL;
3162 // -native
3163 } else if (match_option(option, "-native")) {
3164 // HotSpot always uses native threads, ignore silently for compatibility
3165 // -Xrs
3166 } else if (match_option(option, "-Xrs")) {
3167 // Classic/EVM option, new functionality
3168 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3169 return JNI_EINVAL;
3170 }
3171 // -Xprof
3172 } else if (match_option(option, "-Xprof")) {
3173 #if INCLUDE_FPROF
3174 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release.");
3175 _has_profile = true;
3176 #else // INCLUDE_FPROF
3177 jio_fprintf(defaultStream::error_stream(),
3178 "Flat profiling is not supported in this VM.\n");
3179 return JNI_ERR;
3180 #endif // INCLUDE_FPROF
3181 // -Xconcurrentio
3182 } else if (match_option(option, "-Xconcurrentio")) {
3183 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3184 return JNI_EINVAL;
3185 }
3186 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3193 return JNI_EINVAL;
3194 }
3195 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3196 return JNI_EINVAL;
3197 }
3198
3199 // -Xinternalversion
3200 } else if (match_option(option, "-Xinternalversion")) {
3201 jio_fprintf(defaultStream::output_stream(), "%s\n",
3202 VM_Version::internal_vm_info_string());
3203 vm_exit(0);
3204 #ifndef PRODUCT
3205 // -Xprintflags
3206 } else if (match_option(option, "-Xprintflags")) {
3207 CommandLineFlags::printFlags(tty, false);
3208 vm_exit(0);
3209 #endif
3210 // -D
3211 } else if (match_option(option, "-D", &tail)) {
3212 const char* value;
3213 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3214 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3215 // abort if -Djava.endorsed.dirs is set
3216 jio_fprintf(defaultStream::output_stream(),
3217 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3218 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3219 return JNI_EINVAL;
3220 }
3221 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3222 *value != '\0' && strcmp(value, "\"\"") != 0) {
3223 // abort if -Djava.ext.dirs is set
3224 jio_fprintf(defaultStream::output_stream(),
3225 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3226 return JNI_EINVAL;
3227 }
3228 // Check for module related properties. They must be set using the modules
3229 // options. For example: use "--add-modules=java.sql", not
3230 // "-Djdk.module.addmods=java.sql"
3231 if (is_internal_module_property(option->optionString + 2)) {
3232 needs_module_property_warning = true;
3233 continue;
3234 }
3235
3236 if (!add_property(tail)) {
3237 return JNI_ENOMEM;
3238 }
3239 // Out of the box management support
3240 if (match_option(option, "-Dcom.sun.management", &tail)) {
3241 #if INCLUDE_MANAGEMENT
3242 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3243 return JNI_EINVAL;
3244 }
3245 // management agent in module jdk.management.agent
3246 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3247 return JNI_ENOMEM;
3248 }
3249 #else
3250 jio_fprintf(defaultStream::output_stream(),
3251 "-Dcom.sun.management is not supported in this VM.\n");
3252 return JNI_ERR;
3253 #endif
3254 }
3255 // -Xint
3256 } else if (match_option(option, "-Xint")) {
3257 set_mode_flags(_int);
3258 // -Xmixed
3259 } else if (match_option(option, "-Xmixed")) {
3260 set_mode_flags(_mixed);
3261 // -Xcomp
3262 } else if (match_option(option, "-Xcomp")) {
3263 // for testing the compiler; turn off all flags that inhibit compilation
3264 set_mode_flags(_comp);
3265 // -Xshare:dump
3266 } else if (match_option(option, "-Xshare:dump")) {
3267 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3268 return JNI_EINVAL;
3269 }
3270 set_mode_flags(_int); // Prevent compilation, which creates objects
3271 // -Xshare:on
3272 } else if (match_option(option, "-Xshare:on")) {
3273 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3274 return JNI_EINVAL;
3275 }
3276 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3277 return JNI_EINVAL;
3278 }
3279 // -Xshare:auto
3280 } else if (match_option(option, "-Xshare:auto")) {
3281 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3282 return JNI_EINVAL;
3283 }
3284 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3285 return JNI_EINVAL;
3286 }
3287 // -Xshare:off
3288 } else if (match_option(option, "-Xshare:off")) {
3289 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3293 return JNI_EINVAL;
3294 }
3295 // -Xverify
3296 } else if (match_option(option, "-Xverify", &tail)) {
3297 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3298 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3299 return JNI_EINVAL;
3300 }
3301 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3302 return JNI_EINVAL;
3303 }
3304 } else if (strcmp(tail, ":remote") == 0) {
3305 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3306 return JNI_EINVAL;
3307 }
3308 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3309 return JNI_EINVAL;
3310 }
3311 } else if (strcmp(tail, ":none") == 0) {
3312 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3313 return JNI_EINVAL;
3314 }
3315 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3316 return JNI_EINVAL;
3317 }
3318 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3319 return JNI_EINVAL;
3320 }
3321 // -Xdebug
3322 } else if (match_option(option, "-Xdebug")) {
3323 // note this flag has been used, then ignore
3324 set_xdebug_mode(true);
3325 // -Xnoagent
3326 } else if (match_option(option, "-Xnoagent")) {
3327 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3328 } else if (match_option(option, "-Xloggc:", &tail)) {
3329 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3330 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3331 _gc_log_filename = os::strdup_check_oom(tail);
3332 } else if (match_option(option, "-Xlog", &tail)) {
3333 bool ret = false;
3334 if (strcmp(tail, ":help") == 0) {
3335 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3336 vm_exit(0);
3337 } else if (strcmp(tail, ":disable") == 0) {
3338 LogConfiguration::disable_logging();
3339 ret = true;
3340 } else if (*tail == '\0') {
3341 ret = LogConfiguration::parse_command_line_arguments();
3342 assert(ret, "-Xlog without arguments should never fail to parse");
3343 } else if (*tail == ':') {
3344 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3345 }
3346 if (ret == false) {
3347 jio_fprintf(defaultStream::error_stream(),
3348 "Invalid -Xlog option '-Xlog%s'\n",
3349 tail);
3350 return JNI_EINVAL;
3351 }
3352 // JNI hooks
3353 } else if (match_option(option, "-Xcheck", &tail)) {
3354 if (!strcmp(tail, ":jni")) {
3355 #if !INCLUDE_JNI_CHECK
3356 warning("JNI CHECKING is not supported in this VM");
3357 #else
3358 CheckJNICalls = true;
3359 #endif // INCLUDE_JNI_CHECK
3360 } else if (is_bad_option(option, args->ignoreUnrecognized,
3361 "check")) {
3362 return JNI_EINVAL;
3363 }
3364 } else if (match_option(option, "vfprintf")) {
3365 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3366 } else if (match_option(option, "exit")) {
3367 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3368 } else if (match_option(option, "abort")) {
3369 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3370 // -XX:+AggressiveHeap
3371 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3372 jint result = set_aggressive_heap_flags();
3373 if (result != JNI_OK) {
3374 return result;
3375 }
3376 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3377 // and the last option wins.
3378 } else if (match_option(option, "-XX:+NeverTenure")) {
3379 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3380 return JNI_EINVAL;
3381 }
3382 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3383 return JNI_EINVAL;
3384 }
3385 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3386 return JNI_EINVAL;
3387 }
3388 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3389 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3390 return JNI_EINVAL;
3391 }
3392 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3393 return JNI_EINVAL;
3394 }
3395 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3396 return JNI_EINVAL;
3397 }
3398 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3399 uintx max_tenuring_thresh = 0;
3400 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3401 jio_fprintf(defaultStream::error_stream(),
3402 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3403 return JNI_EINVAL;
3404 }
3405
3406 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3407 return JNI_EINVAL;
3408 }
3409
3410 if (MaxTenuringThreshold == 0) {
3411 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3412 return JNI_EINVAL;
3413 }
3414 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3415 return JNI_EINVAL;
3416 }
3417 } else {
3418 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3419 return JNI_EINVAL;
3420 }
3421 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3422 return JNI_EINVAL;
3423 }
3424 }
3425 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3426 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3427 return JNI_EINVAL;
3428 }
3429 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3430 return JNI_EINVAL;
3431 }
3432 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3433 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3434 return JNI_EINVAL;
3435 }
3436 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3437 return JNI_EINVAL;
3438 }
3439 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3440 #if defined(DTRACE_ENABLED)
3441 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3442 return JNI_EINVAL;
3443 }
3444 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3445 return JNI_EINVAL;
3446 }
3447 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3448 return JNI_EINVAL;
3449 }
3450 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3451 return JNI_EINVAL;
3452 }
3453 #else // defined(DTRACE_ENABLED)
3454 jio_fprintf(defaultStream::error_stream(),
3455 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3456 return JNI_EINVAL;
3457 #endif // defined(DTRACE_ENABLED)
3458 #ifdef ASSERT
3459 } else if (match_option(option, "-XX:+FullGCALot")) {
3460 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3461 return JNI_EINVAL;
3462 }
3463 // disable scavenge before parallel mark-compact
3464 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3465 return JNI_EINVAL;
3466 }
3467 #endif
3468 #if !INCLUDE_MANAGEMENT
3469 } else if (match_option(option, "-XX:+ManagementServer")) {
3470 jio_fprintf(defaultStream::error_stream(),
3471 "ManagementServer is not supported in this VM.\n");
3472 return JNI_ERR;
3473 #endif // INCLUDE_MANAGEMENT
3474 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3475 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3476 // already been handled
3477 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3478 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3479 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3480 return JNI_EINVAL;
3481 }
3482 }
3483 // Unknown option
3484 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3485 return JNI_ERR;
3486 }
3487 }
3488
3489 // PrintSharedArchiveAndExit will turn on
3490 // -Xshare:on
3491 // -Xlog:class+path=info
3492 if (PrintSharedArchiveAndExit) {
3493 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3494 return JNI_EINVAL;
3495 }
3496 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3497 return JNI_EINVAL;
3498 }
3499 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3500 }
3501
3502 // Change the default value for flags which have different default values
3503 // when working with older JDKs.
3504 #ifdef LINUX
3505 if (JDK_Version::current().compare_major(6) <= 0 &&
3506 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3507 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3508 }
3509 #endif // LINUX
3510 fix_appclasspath();
3511 return JNI_OK;
3512 }
3513
3514 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3515 // For java.base check for duplicate --patch-module options being specified on the command line.
3516 // This check is only required for java.base, all other duplicate module specifications
3517 // will be checked during module system initialization. The module system initialization
3518 // will throw an ExceptionInInitializerError if this situation occurs.
3519 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3520 if (*patch_mod_javabase) {
3521 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3522 } else {
3523 *patch_mod_javabase = true;
3524 }
3525 }
3526
3527 // Create GrowableArray lazily, only if --patch-module has been specified
3528 if (_patch_mod_prefix == NULL) {
3529 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3530 }
3531
3532 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3533 }
3534
3535 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3536 //
3537 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3538 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3539 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3540 // path is treated as the current directory.
3541 //
3542 // This causes problems with CDS, which requires that all directories specified in the classpath
3543 // must be empty. In most cases, applications do NOT want to load classes from the current
3544 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3545 // scripts compatible with CDS.
3546 void Arguments::fix_appclasspath() {
3547 if (IgnoreEmptyClassPaths) {
3548 const char separator = *os::path_separator();
3549 const char* src = _java_class_path->value();
3550
3551 // skip over all the leading empty paths
3552 while (*src == separator) {
3553 src ++;
3554 }
3555
3556 char* copy = os::strdup_check_oom(src, mtArguments);
3557
3558 // trim all trailing empty paths
3559 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3560 *tail = '\0';
3561 }
3562
3563 char from[3] = {separator, separator, '\0'};
3564 char to [2] = {separator, '\0'};
3565 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3566 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3567 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3568 }
3569
3570 _java_class_path->set_writeable_value(copy);
3571 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3572 }
3573 }
3574
3575 static bool has_jar_files(const char* directory) {
3576 DIR* dir = os::opendir(directory);
3577 if (dir == NULL) return false;
3578
3579 struct dirent *entry;
3580 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3581 bool hasJarFile = false;
3582 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3583 const char* name = entry->d_name;
3584 const char* ext = name + strlen(name) - 4;
3585 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3586 }
3587 FREE_C_HEAP_ARRAY(char, dbuf);
3588 os::closedir(dir);
3589 return hasJarFile ;
3590 }
3591
3592 static int check_non_empty_dirs(const char* path) {
3593 const char separator = *os::path_separator();
3594 const char* const end = path + strlen(path);
3595 int nonEmptyDirs = 0;
3596 while (path < end) {
3597 const char* tmp_end = strchr(path, separator);
3598 if (tmp_end == NULL) {
3599 if (has_jar_files(path)) {
3600 nonEmptyDirs++;
3601 jio_fprintf(defaultStream::output_stream(),
3602 "Non-empty directory: %s\n", path);
3603 }
3604 path = end;
3605 } else {
3606 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3607 memcpy(dirpath, path, tmp_end - path);
3608 dirpath[tmp_end - path] = '\0';
3609 if (has_jar_files(dirpath)) {
3610 nonEmptyDirs++;
3611 jio_fprintf(defaultStream::output_stream(),
3612 "Non-empty directory: %s\n", dirpath);
3613 }
3614 FREE_C_HEAP_ARRAY(char, dirpath);
3615 path = tmp_end + 1;
3616 }
3617 }
3618 return nonEmptyDirs;
3619 }
3620
3621 jint Arguments::finalize_vm_init_args() {
3622 // check if the default lib/endorsed directory exists; if so, error
3623 char path[JVM_MAXPATHLEN];
3624 const char* fileSep = os::file_separator();
3625 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3626
3627 if (CheckEndorsedAndExtDirs) {
3628 int nonEmptyDirs = 0;
3629 // check endorsed directory
3630 nonEmptyDirs += check_non_empty_dirs(path);
3631 // check the extension directories
3632 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3633 if (nonEmptyDirs > 0) {
3634 return JNI_ERR;
3635 }
3636 }
3637
3638 DIR* dir = os::opendir(path);
3639 if (dir != NULL) {
3640 jio_fprintf(defaultStream::output_stream(),
3641 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3642 "in modular form will be supported via the concept of upgradeable modules.\n");
3643 os::closedir(dir);
3644 return JNI_ERR;
3645 }
3646
3647 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3648 dir = os::opendir(path);
3649 if (dir != NULL) {
3650 jio_fprintf(defaultStream::output_stream(),
3651 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3652 "Use -classpath instead.\n.");
3653 os::closedir(dir);
3654 return JNI_ERR;
3655 }
3656
3657 // This must be done after all arguments have been processed.
3658 // java_compiler() true means set to "NONE" or empty.
3659 if (java_compiler() && !xdebug_mode()) {
3660 // For backwards compatibility, we switch to interpreted mode if
3661 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3662 // not specified.
3663 set_mode_flags(_int);
3664 }
3665
3666 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3667 // but like -Xint, leave compilation thresholds unaffected.
3668 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3669 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3670 set_mode_flags(_int);
3671 }
3672
3673 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3674 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3675 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3676 }
3677
3678 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3679 // Don't degrade server performance for footprint
3680 if (FLAG_IS_DEFAULT(UseLargePages) &&
3681 MaxHeapSize < LargePageHeapSizeThreshold) {
3682 // No need for large granularity pages w/small heaps.
3683 // Note that large pages are enabled/disabled for both the
3684 // Java heap and the code cache.
3685 FLAG_SET_DEFAULT(UseLargePages, false);
3686 }
3687
3688 #elif defined(COMPILER2)
3689 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3690 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3691 }
3692 #endif
3693
3694 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3695 UNSUPPORTED_OPTION(ProfileInterpreter);
3696 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3697 #endif
3698
3699 #ifndef TIERED
3700 // Tiered compilation is undefined.
3701 UNSUPPORTED_OPTION(TieredCompilation);
3702 #endif
3703
3704 #if INCLUDE_JVMCI
3705 if (EnableJVMCI &&
3706 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3707 return JNI_ENOMEM;
3708 }
3709 #endif
3710
3711 // If we are running in a headless jre, force java.awt.headless property
3712 // to be true unless the property has already been set.
3713 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3714 if (os::is_headless_jre()) {
3715 const char* headless = Arguments::get_property("java.awt.headless");
3716 if (headless == NULL) {
3717 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3718 if (headless_env == NULL) {
3719 if (!add_property("java.awt.headless=true")) {
3720 return JNI_ENOMEM;
3721 }
3722 } else {
3723 char buffer[256];
3724 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3725 if (!add_property(buffer)) {
3726 return JNI_ENOMEM;
3727 }
3728 }
3729 }
3730 }
3731
3732 if (!check_vm_args_consistency()) {
3733 return JNI_ERR;
3734 }
3735
3736 #if INCLUDE_JVMCI
3737 if (UseJVMCICompiler) {
3738 Compilation_mode = CompMode_server;
3739 }
3740 #endif
3741
3742 return JNI_OK;
3743 }
3744
3745 // Helper class for controlling the lifetime of JavaVMInitArgs
3746 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3747 // deleted on the destruction of the ScopedVMInitArgs object.
3748 class ScopedVMInitArgs : public StackObj {
3749 private:
3750 JavaVMInitArgs _args;
3751 char* _container_name;
3752 bool _is_set;
3753 char* _vm_options_file_arg;
3754
3755 public:
3756 ScopedVMInitArgs(const char *container_name) {
3757 _args.version = JNI_VERSION_1_2;
3758 _args.nOptions = 0;
3759 _args.options = NULL;
3760 _args.ignoreUnrecognized = false;
3761 _container_name = (char *)container_name;
3762 _is_set = false;
3763 _vm_options_file_arg = NULL;
3764 }
3765
3766 // Populates the JavaVMInitArgs object represented by this
3767 // ScopedVMInitArgs object with the arguments in options. The
3768 // allocated memory is deleted by the destructor. If this method
3769 // returns anything other than JNI_OK, then this object is in a
3770 // partially constructed state, and should be abandoned.
3771 jint set_args(GrowableArray<JavaVMOption>* options) {
3772 _is_set = true;
3773 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3774 JavaVMOption, options->length(), mtArguments);
3775 if (options_arr == NULL) {
3776 return JNI_ENOMEM;
3777 }
3778 _args.options = options_arr;
3779
3780 for (int i = 0; i < options->length(); i++) {
3781 options_arr[i] = options->at(i);
3782 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3783 if (options_arr[i].optionString == NULL) {
3784 // Rely on the destructor to do cleanup.
3785 _args.nOptions = i;
3786 return JNI_ENOMEM;
3787 }
3788 }
3789
3790 _args.nOptions = options->length();
3791 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3792 return JNI_OK;
3793 }
3794
3795 JavaVMInitArgs* get() { return &_args; }
3796 char* container_name() { return _container_name; }
3797 bool is_set() { return _is_set; }
3798 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3799 char* vm_options_file_arg() { return _vm_options_file_arg; }
3800
3801 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3802 if (_vm_options_file_arg != NULL) {
3803 os::free(_vm_options_file_arg);
3804 }
3805 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3806 }
3807
3808 ~ScopedVMInitArgs() {
3809 if (_vm_options_file_arg != NULL) {
3810 os::free(_vm_options_file_arg);
3811 }
3812 if (_args.options == NULL) return;
3813 for (int i = 0; i < _args.nOptions; i++) {
3814 os::free(_args.options[i].optionString);
3815 }
3816 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3817 }
3818
3819 // Insert options into this option list, to replace option at
3820 // vm_options_file_pos (-XX:VMOptionsFile)
3821 jint insert(const JavaVMInitArgs* args,
3822 const JavaVMInitArgs* args_to_insert,
3823 const int vm_options_file_pos) {
3824 assert(_args.options == NULL, "shouldn't be set yet");
3825 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3826 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3827
3828 int length = args->nOptions + args_to_insert->nOptions - 1;
3829 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3830 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3831 for (int i = 0; i < args->nOptions; i++) {
3832 if (i == vm_options_file_pos) {
3833 // insert the new options starting at the same place as the
3834 // -XX:VMOptionsFile option
3835 for (int j = 0; j < args_to_insert->nOptions; j++) {
3836 options->push(args_to_insert->options[j]);
3837 }
3838 } else {
3839 options->push(args->options[i]);
3840 }
3841 }
3842 // make into options array
3843 jint result = set_args(options);
3844 delete options;
3845 return result;
3846 }
3847 };
3848
3849 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3850 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3851 }
3852
3853 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3854 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3855 }
3856
3857 jint Arguments::parse_options_environment_variable(const char* name,
3858 ScopedVMInitArgs* vm_args) {
3859 char *buffer = ::getenv(name);
3860
3861 // Don't check this environment variable if user has special privileges
3862 // (e.g. unix su command).
3863 if (buffer == NULL || os::have_special_privileges()) {
3864 return JNI_OK;
3865 }
3866
3867 if ((buffer = os::strdup(buffer)) == NULL) {
3868 return JNI_ENOMEM;
3869 }
3870
3871 jio_fprintf(defaultStream::error_stream(),
3872 "Picked up %s: %s\n", name, buffer);
3873
3874 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3875
3876 os::free(buffer);
3877 return retcode;
3878 }
3879
3880 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3881 // read file into buffer
3882 int fd = ::open(file_name, O_RDONLY);
3883 if (fd < 0) {
3884 jio_fprintf(defaultStream::error_stream(),
3885 "Could not open options file '%s'\n",
3886 file_name);
3887 return JNI_ERR;
3888 }
3889
3890 struct stat stbuf;
3891 int retcode = os::stat(file_name, &stbuf);
3892 if (retcode != 0) {
3893 jio_fprintf(defaultStream::error_stream(),
3894 "Could not stat options file '%s'\n",
3895 file_name);
3896 os::close(fd);
3897 return JNI_ERR;
3898 }
3899
3900 if (stbuf.st_size == 0) {
3901 // tell caller there is no option data and that is ok
3902 os::close(fd);
3903 return JNI_OK;
3904 }
3905
3906 // '+ 1' for NULL termination even with max bytes
3907 size_t bytes_alloc = stbuf.st_size + 1;
3908
3909 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3910 if (NULL == buf) {
3911 jio_fprintf(defaultStream::error_stream(),
3912 "Could not allocate read buffer for options file parse\n");
3913 os::close(fd);
3914 return JNI_ENOMEM;
3915 }
3916
3917 memset(buf, 0, bytes_alloc);
3918
3919 // Fill buffer
3920 // Use ::read() instead of os::read because os::read()
3921 // might do a thread state transition
3922 // and it is too early for that here
3923
3924 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3925 os::close(fd);
3926 if (bytes_read < 0) {
3927 FREE_C_HEAP_ARRAY(char, buf);
3928 jio_fprintf(defaultStream::error_stream(),
3929 "Could not read options file '%s'\n", file_name);
3930 return JNI_ERR;
3931 }
3932
3933 if (bytes_read == 0) {
3934 // tell caller there is no option data and that is ok
3935 FREE_C_HEAP_ARRAY(char, buf);
3936 return JNI_OK;
3937 }
3938
3939 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3940
3941 FREE_C_HEAP_ARRAY(char, buf);
3942 return retcode;
3943 }
3944
3945 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3946 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3947
3948 // some pointers to help with parsing
3949 char *buffer_end = buffer + buf_len;
3950 char *opt_hd = buffer;
3951 char *wrt = buffer;
3952 char *rd = buffer;
3953
3954 // parse all options
3955 while (rd < buffer_end) {
3956 // skip leading white space from the input string
3957 while (rd < buffer_end && isspace(*rd)) {
3958 rd++;
3959 }
3960
3961 if (rd >= buffer_end) {
3962 break;
3963 }
3964
3965 // Remember this is where we found the head of the token.
3966 opt_hd = wrt;
3967
3968 // Tokens are strings of non white space characters separated
3969 // by one or more white spaces.
3970 while (rd < buffer_end && !isspace(*rd)) {
3971 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3972 int quote = *rd; // matching quote to look for
3973 rd++; // don't copy open quote
3974 while (rd < buffer_end && *rd != quote) {
3975 // include everything (even spaces)
3976 // up until the close quote
3977 *wrt++ = *rd++; // copy to option string
3978 }
3979
3980 if (rd < buffer_end) {
3981 rd++; // don't copy close quote
3982 } else {
3983 // did not see closing quote
3984 jio_fprintf(defaultStream::error_stream(),
3985 "Unmatched quote in %s\n", name);
3986 delete options;
3987 return JNI_ERR;
3988 }
3989 } else {
3990 *wrt++ = *rd++; // copy to option string
3991 }
3992 }
3993
3994 // steal a white space character and set it to NULL
3995 *wrt++ = '\0';
3996 // We now have a complete token
3997
3998 JavaVMOption option;
3999 option.optionString = opt_hd;
4000 option.extraInfo = NULL;
4001
4002 options->append(option); // Fill in option
4003
4004 rd++; // Advance to next character
4005 }
4006
4007 // Fill out JavaVMInitArgs structure.
4008 jint status = vm_args->set_args(options);
4009
4010 delete options;
4011 return status;
4012 }
4013
4014 void Arguments::set_shared_spaces_flags() {
4015 if (DumpSharedSpaces) {
4016 if (FailOverToOldVerifier) {
4017 // Don't fall back to the old verifier on verification failure. If a
4018 // class fails verification with the split verifier, it might fail the
4019 // CDS runtime verifier constraint check. In that case, we don't want
4020 // to share the class. We only archive classes that pass the split verifier.
4021 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
4022 }
4023
4024 if (RequireSharedSpaces) {
4025 warning("Cannot dump shared archive while using shared archive");
4026 }
4027 UseSharedSpaces = false;
4028 #ifdef _LP64
4029 if (!UseCompressedOops || !UseCompressedClassPointers) {
4030 vm_exit_during_initialization(
4031 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4032 }
4033 } else {
4034 if (!UseCompressedOops || !UseCompressedClassPointers) {
4035 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4036 }
4037 #endif
4038 }
4039 }
4040
4041 // Sharing support
4042 // Construct the path to the archive
4043 static char* get_shared_archive_path() {
4044 char *shared_archive_path;
4045 if (SharedArchiveFile == NULL) {
4046 char jvm_path[JVM_MAXPATHLEN];
4047 os::jvm_path(jvm_path, sizeof(jvm_path));
4048 char *end = strrchr(jvm_path, *os::file_separator());
4049 if (end != NULL) *end = '\0';
4050 size_t jvm_path_len = strlen(jvm_path);
4051 size_t file_sep_len = strlen(os::file_separator());
4052 const size_t len = jvm_path_len + file_sep_len + 20;
4053 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4054 if (shared_archive_path != NULL) {
4055 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4056 jvm_path, os::file_separator());
4057 }
4058 } else {
4059 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4060 }
4061 return shared_archive_path;
4062 }
4063
4064 #ifndef PRODUCT
4065 // Determine whether LogVMOutput should be implicitly turned on.
4066 static bool use_vm_log() {
4067 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4068 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4069 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4070 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4071 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4072 return true;
4073 }
4074
4075 #ifdef COMPILER1
4076 if (PrintC1Statistics) {
4077 return true;
4078 }
4079 #endif // COMPILER1
4080
4081 #ifdef COMPILER2
4082 if (PrintOptoAssembly || PrintOptoStatistics) {
4083 return true;
4084 }
4085 #endif // COMPILER2
4086
4087 return false;
4088 }
4089
4090 #endif // PRODUCT
4091
4092 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4093 for (int index = 0; index < args->nOptions; index++) {
4094 const JavaVMOption* option = args->options + index;
4095 const char* tail;
4096 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4097 return true;
4098 }
4099 }
4100 return false;
4101 }
4102
4103 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4104 const char* vm_options_file,
4105 const int vm_options_file_pos,
4106 ScopedVMInitArgs* vm_options_file_args,
4107 ScopedVMInitArgs* args_out) {
4108 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4109 if (code != JNI_OK) {
4110 return code;
4111 }
4112
4113 if (vm_options_file_args->get()->nOptions < 1) {
4114 return JNI_OK;
4115 }
4116
4117 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4118 jio_fprintf(defaultStream::error_stream(),
4119 "A VM options file may not refer to a VM options file. "
4120 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4121 "options file '%s' in options container '%s' is an error.\n",
4122 vm_options_file_args->vm_options_file_arg(),
4123 vm_options_file_args->container_name());
4124 return JNI_EINVAL;
4125 }
4126
4127 return args_out->insert(args, vm_options_file_args->get(),
4128 vm_options_file_pos);
4129 }
4130
4131 // Expand -XX:VMOptionsFile found in args_in as needed.
4132 // mod_args and args_out parameters may return values as needed.
4133 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4134 ScopedVMInitArgs* mod_args,
4135 JavaVMInitArgs** args_out) {
4136 jint code = match_special_option_and_act(args_in, mod_args);
4137 if (code != JNI_OK) {
4138 return code;
4139 }
4140
4141 if (mod_args->is_set()) {
4142 // args_in contains -XX:VMOptionsFile and mod_args contains the
4143 // original options from args_in along with the options expanded
4144 // from the VMOptionsFile. Return a short-hand to the caller.
4145 *args_out = mod_args->get();
4146 } else {
4147 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4148 }
4149 return JNI_OK;
4150 }
4151
4152 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4153 ScopedVMInitArgs* args_out) {
4154 // Remaining part of option string
4155 const char* tail;
4156 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4157
4158 for (int index = 0; index < args->nOptions; index++) {
4159 const JavaVMOption* option = args->options + index;
4160 if (ArgumentsExt::process_options(option)) {
4161 continue;
4162 }
4163 if (match_option(option, "-XX:Flags=", &tail)) {
4164 Arguments::set_jvm_flags_file(tail);
4165 continue;
4166 }
4167 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4168 if (vm_options_file_args.found_vm_options_file_arg()) {
4169 jio_fprintf(defaultStream::error_stream(),
4170 "The option '%s' is already specified in the options "
4171 "container '%s' so the specification of '%s' in the "
4172 "same options container is an error.\n",
4173 vm_options_file_args.vm_options_file_arg(),
4174 vm_options_file_args.container_name(),
4175 option->optionString);
4176 return JNI_EINVAL;
4177 }
4178 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4179 // If there's a VMOptionsFile, parse that
4180 jint code = insert_vm_options_file(args, tail, index,
4181 &vm_options_file_args, args_out);
4182 if (code != JNI_OK) {
4183 return code;
4184 }
4185 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4186 if (args_out->is_set()) {
4187 // The VMOptions file inserted some options so switch 'args'
4188 // to the new set of options, and continue processing which
4189 // preserves "last option wins" semantics.
4190 args = args_out->get();
4191 // The first option from the VMOptionsFile replaces the
4192 // current option. So we back track to process the
4193 // replacement option.
4194 index--;
4195 }
4196 continue;
4197 }
4198 if (match_option(option, "-XX:+PrintVMOptions")) {
4199 PrintVMOptions = true;
4200 continue;
4201 }
4202 if (match_option(option, "-XX:-PrintVMOptions")) {
4203 PrintVMOptions = false;
4204 continue;
4205 }
4206 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4207 IgnoreUnrecognizedVMOptions = true;
4208 continue;
4209 }
4210 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4211 IgnoreUnrecognizedVMOptions = false;
4212 continue;
4213 }
4214 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4215 CommandLineFlags::printFlags(tty, false);
4216 vm_exit(0);
4217 }
4218 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4219 #if INCLUDE_NMT
4220 // The launcher did not setup nmt environment variable properly.
4221 if (!MemTracker::check_launcher_nmt_support(tail)) {
4222 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4223 }
4224
4225 // Verify if nmt option is valid.
4226 if (MemTracker::verify_nmt_option()) {
4227 // Late initialization, still in single-threaded mode.
4228 if (MemTracker::tracking_level() >= NMT_summary) {
4229 MemTracker::init();
4230 }
4231 } else {
4232 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4233 }
4234 continue;
4235 #else
4236 jio_fprintf(defaultStream::error_stream(),
4237 "Native Memory Tracking is not supported in this VM\n");
4238 return JNI_ERR;
4239 #endif
4240 }
4241
4242 #ifndef PRODUCT
4243 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4244 CommandLineFlags::printFlags(tty, true);
4245 vm_exit(0);
4246 }
4247 #endif
4248 }
4249 return JNI_OK;
4250 }
4251
4252 static void print_options(const JavaVMInitArgs *args) {
4253 const char* tail;
4254 for (int index = 0; index < args->nOptions; index++) {
4255 const JavaVMOption *option = args->options + index;
4256 if (match_option(option, "-XX:", &tail)) {
4257 logOption(tail);
4258 }
4259 }
4260 }
4261
4262 bool Arguments::handle_deprecated_print_gc_flags() {
4263 if (PrintGC) {
4264 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4265 }
4266 if (PrintGCDetails) {
4267 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4268 }
4269
4270 if (_gc_log_filename != NULL) {
4271 // -Xloggc was used to specify a filename
4272 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4273
4274 LogTarget(Error, logging) target;
4275 LogStream errstream(target);
4276 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4277 } else if (PrintGC || PrintGCDetails) {
4278 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4279 }
4280 return true;
4281 }
4282
4283 void Arguments::handle_extra_cms_flags(const char* msg) {
4284 SpecialFlag flag;
4285 const char *flag_name = "UseConcMarkSweepGC";
4286 if (lookup_special_flag(flag_name, flag)) {
4287 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4288 warning("%s", msg);
4289 }
4290 }
4291
4292 // Parse entry point called from JNI_CreateJavaVM
4293
4294 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4295 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4296
4297 // Initialize ranges, constraints and writeables
4298 CommandLineFlagRangeList::init();
4299 CommandLineFlagConstraintList::init();
4300 CommandLineFlagWriteableList::init();
4301
4302 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4303 const char* hotspotrc = ".hotspotrc";
4304 bool settings_file_specified = false;
4305 bool needs_hotspotrc_warning = false;
4306 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4307 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4308
4309 // Pointers to current working set of containers
4310 JavaVMInitArgs* cur_cmd_args;
4311 JavaVMInitArgs* cur_java_options_args;
4312 JavaVMInitArgs* cur_java_tool_options_args;
4313
4314 // Containers for modified/expanded options
4315 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4316 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4317 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4318
4319
4320 jint code =
4321 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4322 if (code != JNI_OK) {
4323 return code;
4324 }
4325
4326 code = parse_java_options_environment_variable(&initial_java_options_args);
4327 if (code != JNI_OK) {
4328 return code;
4329 }
4330
4331 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4332 &mod_java_tool_options_args,
4333 &cur_java_tool_options_args);
4334 if (code != JNI_OK) {
4335 return code;
4336 }
4337
4338 code = expand_vm_options_as_needed(initial_cmd_args,
4339 &mod_cmd_args,
4340 &cur_cmd_args);
4341 if (code != JNI_OK) {
4342 return code;
4343 }
4344
4345 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4346 &mod_java_options_args,
4347 &cur_java_options_args);
4348 if (code != JNI_OK) {
4349 return code;
4350 }
4351
4352 const char* flags_file = Arguments::get_jvm_flags_file();
4353 settings_file_specified = (flags_file != NULL);
4354
4355 if (IgnoreUnrecognizedVMOptions) {
4356 cur_cmd_args->ignoreUnrecognized = true;
4357 cur_java_tool_options_args->ignoreUnrecognized = true;
4358 cur_java_options_args->ignoreUnrecognized = true;
4359 }
4360
4361 // Parse specified settings file
4362 if (settings_file_specified) {
4363 if (!process_settings_file(flags_file, true,
4364 cur_cmd_args->ignoreUnrecognized)) {
4365 return JNI_EINVAL;
4366 }
4367 } else {
4368 #ifdef ASSERT
4369 // Parse default .hotspotrc settings file
4370 if (!process_settings_file(".hotspotrc", false,
4371 cur_cmd_args->ignoreUnrecognized)) {
4372 return JNI_EINVAL;
4373 }
4374 #else
4375 struct stat buf;
4376 if (os::stat(hotspotrc, &buf) == 0) {
4377 needs_hotspotrc_warning = true;
4378 }
4379 #endif
4380 }
4381
4382 if (PrintVMOptions) {
4383 print_options(cur_java_tool_options_args);
4384 print_options(cur_cmd_args);
4385 print_options(cur_java_options_args);
4386 }
4387
4388 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4389 jint result = parse_vm_init_args(cur_java_tool_options_args,
4390 cur_java_options_args,
4391 cur_cmd_args);
4392
4393 if (result != JNI_OK) {
4394 return result;
4395 }
4396
4397 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4398 SharedArchivePath = get_shared_archive_path();
4399 if (SharedArchivePath == NULL) {
4400 return JNI_ENOMEM;
4401 }
4402
4403 // Set up VerifySharedSpaces
4404 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4405 VerifySharedSpaces = true;
4406 }
4407
4408 // Delay warning until here so that we've had a chance to process
4409 // the -XX:-PrintWarnings flag
4410 if (needs_hotspotrc_warning) {
4411 warning("%s file is present but has been ignored. "
4412 "Run with -XX:Flags=%s to load the file.",
4413 hotspotrc, hotspotrc);
4414 }
4415
4416 if (needs_module_property_warning) {
4417 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4418 " names that are reserved for internal use.");
4419 }
4420
4421 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4422 UNSUPPORTED_OPTION(UseLargePages);
4423 #endif
4424
4425 ArgumentsExt::report_unsupported_options();
4426
4427 #ifndef PRODUCT
4428 if (TraceBytecodesAt != 0) {
4429 TraceBytecodes = true;
4430 }
4431 if (CountCompiledCalls) {
4432 if (UseCounterDecay) {
4433 warning("UseCounterDecay disabled because CountCalls is set");
4434 UseCounterDecay = false;
4435 }
4436 }
4437 #endif // PRODUCT
4438
4439 if (ScavengeRootsInCode == 0) {
4440 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4441 warning("Forcing ScavengeRootsInCode non-zero");
4442 }
4443 ScavengeRootsInCode = 1;
4444 }
4445
4446 if (!handle_deprecated_print_gc_flags()) {
4447 return JNI_EINVAL;
4448 }
4449
4450 // Set object alignment values.
4451 set_object_alignment();
4452
4453 #if !INCLUDE_CDS
4454 if (DumpSharedSpaces || RequireSharedSpaces) {
4455 jio_fprintf(defaultStream::error_stream(),
4456 "Shared spaces are not supported in this VM\n");
4457 return JNI_ERR;
4458 }
4459 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4460 log_is_enabled(Info, cds)) {
4461 warning("Shared spaces are not supported in this VM");
4462 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4463 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4464 }
4465 no_shared_spaces("CDS Disabled");
4466 #endif // INCLUDE_CDS
4467
4468 return JNI_OK;
4469 }
4470
4471 jint Arguments::apply_ergo() {
4472 // Set flags based on ergonomics.
4473 set_ergonomics_flags();
4474
4475 #if INCLUDE_JVMCI
4476 set_jvmci_specific_flags();
4477 #endif
4478
4479 set_shared_spaces_flags();
4480
4481 #if defined(SPARC)
4482 // BIS instructions require 'membar' instruction regardless of the number
4483 // of CPUs because in virtualized/container environments which might use only 1
4484 // CPU, BIS instructions may produce incorrect results.
4485
4486 if (FLAG_IS_DEFAULT(AssumeMP)) {
4487 FLAG_SET_DEFAULT(AssumeMP, true);
4488 }
4489 #endif
4490
4491 // Check the GC selections again.
4492 if (!check_gc_consistency()) {
4493 return JNI_EINVAL;
4494 }
4495
4496 if (TieredCompilation) {
4497 set_tiered_flags();
4498 } else {
4499 int max_compilation_policy_choice = 1;
4500 #ifdef COMPILER2
4501 if (is_server_compilation_mode_vm()) {
4502 max_compilation_policy_choice = 2;
4503 }
4504 #endif
4505 // Check if the policy is valid.
4506 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4507 vm_exit_during_initialization(
4508 "Incompatible compilation policy selected", NULL);
4509 }
4510 // Scale CompileThreshold
4511 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4512 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4513 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4514 }
4515 }
4516
4517 #ifdef COMPILER2
4518 #ifndef PRODUCT
4519 if (PrintIdealGraphLevel > 0) {
4520 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4521 }
4522 #endif
4523 #endif
4524
4525 // Set heap size based on available physical memory
4526 set_heap_size();
4527
4528 ArgumentsExt::set_gc_specific_flags();
4529
4530 // Initialize Metaspace flags and alignments
4531 Metaspace::ergo_initialize();
4532
4533 // Set bytecode rewriting flags
4534 set_bytecode_flags();
4535
4536 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4537 jint code = set_aggressive_opts_flags();
4538 if (code != JNI_OK) {
4539 return code;
4540 }
4541
4542 // Turn off biased locking for locking debug mode flags,
4543 // which are subtly different from each other but neither works with
4544 // biased locking
4545 if (UseHeavyMonitors
4546 #ifdef COMPILER1
4547 || !UseFastLocking
4548 #endif // COMPILER1
4549 #if INCLUDE_JVMCI
4550 || !JVMCIUseFastLocking
4551 #endif
4552 ) {
4553 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4554 // flag set to true on command line; warn the user that they
4555 // can't enable biased locking here
4556 warning("Biased Locking is not supported with locking debug flags"
4557 "; ignoring UseBiasedLocking flag." );
4558 }
4559 UseBiasedLocking = false;
4560 }
4561
4562 #ifdef CC_INTERP
4563 // Clear flags not supported on zero.
4564 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4565 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4566 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4567 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4568 #endif // CC_INTERP
4569
4570 #ifdef COMPILER2
4571 if (!EliminateLocks) {
4572 EliminateNestedLocks = false;
4573 }
4574 if (!Inline) {
4575 IncrementalInline = false;
4576 }
4577 #ifndef PRODUCT
4578 if (!IncrementalInline) {
4579 AlwaysIncrementalInline = false;
4580 }
4581 #endif
4582 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4583 // nothing to use the profiling, turn if off
4584 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4585 }
4586 #endif
4587
4588 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4589 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4590 DebugNonSafepoints = true;
4591 }
4592
4593 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4594 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4595 }
4596
4597 if (UseOnStackReplacement && !UseLoopCounter) {
4598 warning("On-stack-replacement requires loop counters; enabling loop counters");
4599 FLAG_SET_DEFAULT(UseLoopCounter, true);
4600 }
4601
4602 #ifndef PRODUCT
4603 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4604 if (use_vm_log()) {
4605 LogVMOutput = true;
4606 }
4607 }
4608 #endif // PRODUCT
4609
4610 if (PrintCommandLineFlags) {
4611 CommandLineFlags::printSetFlags(tty);
4612 }
4613
4614 // Apply CPU specific policy for the BiasedLocking
4615 if (UseBiasedLocking) {
4616 if (!VM_Version::use_biased_locking() &&
4617 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4618 UseBiasedLocking = false;
4619 }
4620 }
4621 #ifdef COMPILER2
4622 if (!UseBiasedLocking || EmitSync != 0) {
4623 UseOptoBiasInlining = false;
4624 }
4625 #endif
4626
4627 return JNI_OK;
4628 }
4629
4630 jint Arguments::adjust_after_os() {
4631 if (UseNUMA) {
4632 if (UseParallelGC || UseParallelOldGC) {
4633 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4634 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4635 }
4636 }
4637 // UseNUMAInterleaving is set to ON for all collectors and
4638 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4639 // such as the parallel collector for Linux and Solaris will
4640 // interleave old gen and survivor spaces on top of NUMA
4641 // allocation policy for the eden space.
4642 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4643 // all platforms and ParallelGC on Windows will interleave all
4644 // of the heap spaces across NUMA nodes.
4645 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4646 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4647 }
4648 }
4649 return JNI_OK;
4650 }
4651
4652 int Arguments::PropertyList_count(SystemProperty* pl) {
4653 int count = 0;
4654 while(pl != NULL) {
4655 count++;
4656 pl = pl->next();
4657 }
4658 return count;
4659 }
4660
4661 // Return the number of readable properties.
4662 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4663 int count = 0;
4664 while(pl != NULL) {
4665 if (pl->is_readable()) {
4666 count++;
4667 }
4668 pl = pl->next();
4669 }
4670 return count;
4671 }
4672
4673 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4674 assert(key != NULL, "just checking");
4675 SystemProperty* prop;
4676 for (prop = pl; prop != NULL; prop = prop->next()) {
4677 if (strcmp(key, prop->key()) == 0) return prop->value();
4678 }
4679 return NULL;
4680 }
4681
4682 // Return the value of the requested property provided that it is a readable property.
4683 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4684 assert(key != NULL, "just checking");
4685 SystemProperty* prop;
4686 // Return the property value if the keys match and the property is not internal or
4687 // it's the special internal property "jdk.boot.class.path.append".
4688 for (prop = pl; prop != NULL; prop = prop->next()) {
4689 if (strcmp(key, prop->key()) == 0) {
4690 if (!prop->internal()) {
4691 return prop->value();
4692 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4693 return prop->value();
4694 } else {
4695 // Property is internal and not jdk.boot.class.path.append so return NULL.
4696 return NULL;
4697 }
4698 }
4699 }
4700 return NULL;
4701 }
4702
4703 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4704 int count = 0;
4705 const char* ret_val = NULL;
4706
4707 while(pl != NULL) {
4708 if(count >= index) {
4709 ret_val = pl->key();
4710 break;
4711 }
4712 count++;
4713 pl = pl->next();
4714 }
4715
4716 return ret_val;
4717 }
4718
4719 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4720 int count = 0;
4721 char* ret_val = NULL;
4722
4723 while(pl != NULL) {
4724 if(count >= index) {
4725 ret_val = pl->value();
4726 break;
4727 }
4728 count++;
4729 pl = pl->next();
4730 }
4731
4732 return ret_val;
4733 }
4734
4735 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4736 SystemProperty* p = *plist;
4737 if (p == NULL) {
4738 *plist = new_p;
4739 } else {
4740 while (p->next() != NULL) {
4741 p = p->next();
4742 }
4743 p->set_next(new_p);
4744 }
4745 }
4746
4747 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4748 bool writeable, bool internal) {
4749 if (plist == NULL)
4750 return;
4751
4752 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4753 PropertyList_add(plist, new_p);
4754 }
4755
4756 void Arguments::PropertyList_add(SystemProperty *element) {
4757 PropertyList_add(&_system_properties, element);
4758 }
4759
4760 // This add maintains unique property key in the list.
4761 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4762 PropertyAppendable append, PropertyWriteable writeable,
4763 PropertyInternal internal) {
4764 if (plist == NULL)
4765 return;
4766
4767 // If property key exist then update with new value.
4768 SystemProperty* prop;
4769 for (prop = *plist; prop != NULL; prop = prop->next()) {
4770 if (strcmp(k, prop->key()) == 0) {
4771 if (append == AppendProperty) {
4772 prop->append_value(v);
4773 } else {
4774 prop->set_value(v);
4775 }
4776 return;
4777 }
4778 }
4779
4780 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4781 }
4782
4783 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4784 // Returns true if all of the source pointed by src has been copied over to
4785 // the destination buffer pointed by buf. Otherwise, returns false.
4786 // Notes:
4787 // 1. If the length (buflen) of the destination buffer excluding the
4788 // NULL terminator character is not long enough for holding the expanded
4789 // pid characters, it also returns false instead of returning the partially
4790 // expanded one.
4791 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4792 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4793 char* buf, size_t buflen) {
4794 const char* p = src;
4795 char* b = buf;
4796 const char* src_end = &src[srclen];
4797 char* buf_end = &buf[buflen - 1];
4798
4799 while (p < src_end && b < buf_end) {
4800 if (*p == '%') {
4801 switch (*(++p)) {
4802 case '%': // "%%" ==> "%"
4803 *b++ = *p++;
4804 break;
4805 case 'p': { // "%p" ==> current process id
4806 // buf_end points to the character before the last character so
4807 // that we could write '\0' to the end of the buffer.
4808 size_t buf_sz = buf_end - b + 1;
4809 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4810
4811 // if jio_snprintf fails or the buffer is not long enough to hold
4812 // the expanded pid, returns false.
4813 if (ret < 0 || ret >= (int)buf_sz) {
4814 return false;
4815 } else {
4816 b += ret;
4817 assert(*b == '\0', "fail in copy_expand_pid");
4818 if (p == src_end && b == buf_end + 1) {
4819 // reach the end of the buffer.
4820 return true;
4821 }
4822 }
4823 p++;
4824 break;
4825 }
4826 default :
4827 *b++ = '%';
4828 }
4829 } else {
4830 *b++ = *p++;
4831 }
4832 }
4833 *b = '\0';
4834 return (p == src_end); // return false if not all of the source was copied
4835 }