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