1 /*
2 * Copyright (c) 1997, 2015, 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/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "gc/shared/cardTableRS.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/arguments_ext.hpp"
42 #include "runtime/commandLineFlagConstraintList.hpp"
43 #include "runtime/commandLineFlagRangeList.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/globals_extension.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/os.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "services/management.hpp"
50 #include "services/memTracker.hpp"
51 #include "utilities/defaultStream.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/stringUtils.hpp"
54 #if INCLUDE_ALL_GCS
55 #include "gc/cms/compactibleFreeListSpace.hpp"
56 #include "gc/g1/g1CollectedHeap.inline.hpp"
57 #include "gc/parallel/parallelScavengeHeap.hpp"
58 #endif // INCLUDE_ALL_GCS
59
60 // Note: This is a special bug reporting site for the JVM
61 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
62 #define DEFAULT_JAVA_LAUNCHER "generic"
63
64 #define UNSUPPORTED_GC_OPTION(gc) \
65 do { \
66 if (gc) { \
67 if (FLAG_IS_CMDLINE(gc)) { \
68 warning(#gc " is not supported in this VM. Using Serial GC."); \
69 } \
70 FLAG_SET_DEFAULT(gc, false); \
71 } \
72 } while(0)
73
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 bool Arguments::_has_profile = false;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 size_t Arguments::_min_heap_size = 0;
84 Arguments::Mode Arguments::_mode = _mixed;
85 bool Arguments::_java_compiler = false;
86 bool Arguments::_xdebug_mode = false;
87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
89 int Arguments::_sun_java_launcher_pid = -1;
90 bool Arguments::_sun_java_launcher_is_altjvm = false;
91
92 // These parameters are reset in method parse_vm_init_args()
93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
95 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
96 bool Arguments::_ClipInlining = ClipInlining;
97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
99
100 char* Arguments::SharedArchivePath = NULL;
101
102 AgentLibraryList Arguments::_libraryList;
103 AgentLibraryList Arguments::_agentList;
104
105 abort_hook_t Arguments::_abort_hook = NULL;
106 exit_hook_t Arguments::_exit_hook = NULL;
107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
108
109
110 SystemProperty *Arguments::_sun_boot_library_path = NULL;
111 SystemProperty *Arguments::_java_library_path = NULL;
112 SystemProperty *Arguments::_java_home = NULL;
113 SystemProperty *Arguments::_java_class_path = NULL;
114 SystemProperty *Arguments::_sun_boot_class_path = NULL;
115
116 char* Arguments::_ext_dirs = NULL;
117
118 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
119 // part of the option string.
120 static bool match_option(const JavaVMOption *option, const char* name,
121 const char** tail) {
122 size_t len = strlen(name);
123 if (strncmp(option->optionString, name, len) == 0) {
124 *tail = option->optionString + len;
125 return true;
126 } else {
127 return false;
128 }
129 }
130
131 // Check if 'option' matches 'name'. No "tail" is allowed.
132 static bool match_option(const JavaVMOption *option, const char* name) {
133 const char* tail = NULL;
134 bool result = match_option(option, name, &tail);
135 if (tail != NULL && *tail == '\0') {
136 return result;
137 } else {
138 return false;
139 }
140 }
141
142 // Return true if any of the strings in null-terminated array 'names' matches.
143 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
144 // the option must match exactly.
145 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
146 bool tail_allowed) {
147 for (/* empty */; *names != NULL; ++names) {
148 if (match_option(option, *names, tail)) {
149 if (**tail == '\0' || tail_allowed && **tail == ':') {
150 return true;
151 }
152 }
153 }
154 return false;
155 }
156
157 static void logOption(const char* opt) {
158 if (PrintVMOptions) {
159 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
160 }
161 }
162
163 // Process java launcher properties.
164 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
165 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
166 // sun.java.launcher.pid is defined.
167 // Must do this before setting up other system properties,
168 // as some of them may depend on launcher type.
169 for (int index = 0; index < args->nOptions; index++) {
170 const JavaVMOption* option = args->options + index;
171 const char* tail;
172
173 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
174 process_java_launcher_argument(tail, option->extraInfo);
175 continue;
176 }
177 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
178 if (strcmp(tail, "true") == 0) {
179 _sun_java_launcher_is_altjvm = true;
180 }
181 continue;
182 }
183 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
184 _sun_java_launcher_pid = atoi(tail);
185 continue;
186 }
187 }
188 }
189
190 // Initialize system properties key and value.
191 void Arguments::init_system_properties() {
192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
193 "Java Virtual Machine Specification", false));
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
197
198 // Following are JVMTI agent writable properties.
199 // Properties values are set to NULL and they are
200 // os specific they are initialized in os::init_system_properties_values().
201 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
202 _java_library_path = new SystemProperty("java.library.path", NULL, true);
203 _java_home = new SystemProperty("java.home", NULL, true);
204 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
205
206 _java_class_path = new SystemProperty("java.class.path", "", true);
207
208 // Add to System Property list.
209 PropertyList_add(&_system_properties, _sun_boot_library_path);
210 PropertyList_add(&_system_properties, _java_library_path);
211 PropertyList_add(&_system_properties, _java_home);
212 PropertyList_add(&_system_properties, _java_class_path);
213 PropertyList_add(&_system_properties, _sun_boot_class_path);
214
215 // Set OS specific system properties values
216 os::init_system_properties_values();
217 }
218
219 // Update/Initialize System properties after JDK version number is known
220 void Arguments::init_version_specific_system_properties() {
221 enum { bufsz = 16 };
222 char buffer[bufsz];
223 const char* spec_vendor = "Oracle Corporation";
224 uint32_t spec_version = JDK_Version::current().major_version();
225
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
227
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
235
236 /*
237 * -XX argument processing:
238 *
239 * -XX arguments are defined in several places, such as:
240 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
241 * -XX arguments are parsed in parse_argument().
242 * -XX argument bounds checking is done in check_vm_args_consistency().
243 *
244 * Over time -XX arguments may change. There are mechanisms to handle common cases:
245 *
246 * ALIASED: An option that is simply another name for another option. This is often
247 * part of the process of deprecating a flag, but not all aliases need
248 * to be deprecated.
249 *
250 * Create an alias for an option by adding the old and new option names to the
251 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
252 *
253 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
254 * support may be removed in the future. Both regular and aliased options may be
255 * deprecated.
256 *
257 * Add a deprecation warning for an option (or alias) by adding an entry in the
258 * "special_jvm_flags" table and setting the "deprecated_in" field.
259 * Often an option "deprecated" in one major release will
260 * be made "obsolete" in the next. In this case the entry should also have it's
261 * "obsolete_in" field set.
262 *
263 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
264 * on the command line. A warning is printed to let the user know that option might not
265 * be accepted in the future.
266 *
267 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
268 * table and setting the "obsolete_in" field.
269 *
270 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
271 * to the current JDK version. The system will flatly refuse to admit the existence of
272 * the flag. This allows a flag to die automatically over JDK releases.
273 *
274 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
275 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
276 * - Newly obsolete or expired deprecated options should have their global variable
277 * definitions removed (from globals.hpp, etc) and related implementations removed.
278 *
279 * Recommended approach for removing options:
280 *
281 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
282 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
283 *
284 * To remove internal options (e.g. diagnostic, experimental, develop options), use
285 * a 2-step model adding major release numbers to the obsolete and expire columns.
286 *
287 * To change the name of an option, use the alias table as well as a 2-step
288 * model adding major release numbers to the deprecate and expire columns.
289 * Think twice about aliasing commonly used customer options.
290 *
291 * There are times when it is appropriate to leave a future release number as undefined.
292 *
293 * Tests: Aliases should be tested in VMAliasOptions.java.
294 * Deprecated options should be tested in VMDeprecatedOptions.java.
295 */
296
297 // Obsolete or deprecated -XX flag.
298 typedef struct {
299 const char* name;
300 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
301 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
302 JDK_Version expired_in; // When the option expires (or "undefined").
303 } SpecialFlag;
304
305 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
306 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
307 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
308 // the command-line as usual, but will issue a warning.
309 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
310 // the command-line, while issuing a warning and ignoring the flag value.
311 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
312 // existence of the flag.
313 //
314 // MANUAL CLEANUP ON JDK VERSION UPDATES:
315 // This table ensures that the handling of options will update automatically when the JDK
316 // version is incremented, but the source code needs to be cleanup up manually:
317 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
318 // variable should be removed, as well as users of the variable.
319 // - As "deprecated" options age into "obsolete" options, move the entry into the
320 // "Obsolete Flags" section of the table.
321 // - All expired options should be removed from the table.
322 static SpecialFlag const special_jvm_flags[] = {
323 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
324 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
325 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
326 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
327 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
328 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
329 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
330 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
331 #endif
332
333 // -------------- Deprecated Flags --------------
334 // --- Non-alias flags - sorted by obsolete_in then expired_in:
335 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
336 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
337
338 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
339 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
340 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
341 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
342 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
343 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
344 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
345 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
346
347 // -------------- Obsolete Flags - sorted by expired_in --------------
348 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
349 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 #ifndef ZERO
362 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 #endif // ZERO
365 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372 { NULL, JDK_Version(0), JDK_Version(0) }
373 };
374
375 // Flags that are aliases for other flags.
376 typedef struct {
377 const char* alias_name;
378 const char* real_name;
379 } AliasedFlag;
380
381 static AliasedFlag const aliased_jvm_flags[] = {
382 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
383 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
384 { "CMSMarkStackSize", "MarkStackSize" },
385 { "G1MarkStackSize", "MarkStackSize" },
386 { "ParallelMarkingThreads", "ConcGCThreads" },
387 { "ParallelCMSThreads", "ConcGCThreads" },
388 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
389 { NULL, NULL}
390 };
391
392 // Return true if "v" is less than "other", where "other" may be "undefined".
393 static bool version_less_than(JDK_Version v, JDK_Version other) {
394 assert(!v.is_undefined(), "must be defined");
395 if (!other.is_undefined() && v.compare(other) >= 0) {
396 return false;
397 } else {
398 return true;
399 }
400 }
401
402 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
403 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
404 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
405 flag = special_jvm_flags[i];
406 return true;
407 }
408 }
409 return false;
410 }
411
412 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
413 assert(version != NULL, "Must provide a version buffer");
414 SpecialFlag flag;
415 if (lookup_special_flag(flag_name, flag)) {
416 if (!flag.obsolete_in.is_undefined()) {
417 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
418 *version = flag.obsolete_in;
419 return true;
420 }
421 }
422 }
423 return false;
424 }
425
426 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
427 assert(version != NULL, "Must provide a version buffer");
428 SpecialFlag flag;
429 if (lookup_special_flag(flag_name, flag)) {
430 if (!flag.deprecated_in.is_undefined()) {
431 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
432 version_less_than(JDK_Version::current(), flag.expired_in)) {
433 *version = flag.deprecated_in;
434 return 1;
435 } else {
436 return -1;
437 }
438 }
439 }
440 return 0;
441 }
442
443 const char* Arguments::real_flag_name(const char *flag_name) {
444 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
445 const AliasedFlag& flag_status = aliased_jvm_flags[i];
446 if (strcmp(flag_status.alias_name, flag_name) == 0) {
447 return flag_status.real_name;
448 }
449 }
450 return flag_name;
451 }
452
453 #ifndef PRODUCT
454 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
455 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
456 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
457 return true;
458 }
459 }
460 return false;
461 }
462
463 static bool verify_special_jvm_flags() {
464 bool success = true;
465 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
466 const SpecialFlag& flag = special_jvm_flags[i];
467 if (lookup_special_flag(flag.name, i)) {
468 warning("Duplicate special flag declaration \"%s\"", flag.name);
469 success = false;
470 }
471 if (flag.deprecated_in.is_undefined() &&
472 flag.obsolete_in.is_undefined()) {
473 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
474 success = false;
475 }
476
477 if (!flag.deprecated_in.is_undefined()) {
478 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
479 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
480 success = false;
481 }
482
483 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
484 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
485 success = false;
486 }
487 }
488
489 if (!flag.obsolete_in.is_undefined()) {
490 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
491 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
492 success = false;
493 }
494
495 // if flag has become obsolete it should not have a "globals" flag defined anymore.
496 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
497 if (Flag::find_flag(flag.name) != NULL) {
498 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
499 success = false;
500 }
501 }
502 }
503
504 if (!flag.expired_in.is_undefined()) {
505 // if flag has become expired it should not have a "globals" flag defined anymore.
506 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
507 if (Flag::find_flag(flag.name) != NULL) {
508 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
509 success = false;
510 }
511 }
512 }
513
514 }
515 return success;
516 }
517 #endif
518
519 // Constructs the system class path (aka boot class path) from the following
520 // components, in order:
521 //
522 // prefix // from -Xbootclasspath/p:...
523 // base // from os::get_system_properties() or -Xbootclasspath=
524 // suffix // from -Xbootclasspath/a:...
525 //
526 // This could be AllStatic, but it isn't needed after argument processing is
527 // complete.
528 class SysClassPath: public StackObj {
529 public:
530 SysClassPath(const char* base);
531 ~SysClassPath();
532
533 inline void set_base(const char* base);
534 inline void add_prefix(const char* prefix);
535 inline void add_suffix_to_prefix(const char* suffix);
536 inline void add_suffix(const char* suffix);
537 inline void reset_path(const char* base);
538
539 inline const char* get_base() const { return _items[_scp_base]; }
540 inline const char* get_prefix() const { return _items[_scp_prefix]; }
541 inline const char* get_suffix() const { return _items[_scp_suffix]; }
542
543 // Combine all the components into a single c-heap-allocated string; caller
544 // must free the string if/when no longer needed.
545 char* combined_path();
546
547 private:
548 // Utility routines.
549 static char* add_to_path(const char* path, const char* str, bool prepend);
550 static char* add_jars_to_path(char* path, const char* directory);
551
552 inline void reset_item_at(int index);
553
554 // Array indices for the items that make up the sysclasspath. All except the
555 // base are allocated in the C heap and freed by this class.
556 enum {
557 _scp_prefix, // from -Xbootclasspath/p:...
558 _scp_base, // the default sysclasspath
559 _scp_suffix, // from -Xbootclasspath/a:...
560 _scp_nitems // the number of items, must be last.
561 };
562
563 const char* _items[_scp_nitems];
564 };
565
566 SysClassPath::SysClassPath(const char* base) {
567 memset(_items, 0, sizeof(_items));
568 _items[_scp_base] = base;
569 }
570
571 SysClassPath::~SysClassPath() {
572 // Free everything except the base.
573 for (int i = 0; i < _scp_nitems; ++i) {
574 if (i != _scp_base) reset_item_at(i);
575 }
576 }
577
578 inline void SysClassPath::set_base(const char* base) {
579 _items[_scp_base] = base;
580 }
581
582 inline void SysClassPath::add_prefix(const char* prefix) {
583 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
584 }
585
586 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
587 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
588 }
589
590 inline void SysClassPath::add_suffix(const char* suffix) {
591 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
592 }
593
594 inline void SysClassPath::reset_item_at(int index) {
595 assert(index < _scp_nitems && index != _scp_base, "just checking");
596 if (_items[index] != NULL) {
597 FREE_C_HEAP_ARRAY(char, _items[index]);
598 _items[index] = NULL;
599 }
600 }
601
602 inline void SysClassPath::reset_path(const char* base) {
603 // Clear the prefix and suffix.
604 reset_item_at(_scp_prefix);
605 reset_item_at(_scp_suffix);
606 set_base(base);
607 }
608
609 //------------------------------------------------------------------------------
610
611
612 // Combine the bootclasspath elements, some of which may be null, into a single
613 // c-heap-allocated string.
614 char* SysClassPath::combined_path() {
615 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
616
617 size_t lengths[_scp_nitems];
618 size_t total_len = 0;
619
620 const char separator = *os::path_separator();
621
622 // Get the lengths.
623 int i;
624 for (i = 0; i < _scp_nitems; ++i) {
625 if (_items[i] != NULL) {
626 lengths[i] = strlen(_items[i]);
627 // Include space for the separator char (or a NULL for the last item).
628 total_len += lengths[i] + 1;
629 }
630 }
631 assert(total_len > 0, "empty sysclasspath not allowed");
632
633 // Copy the _items to a single string.
634 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
635 char* cp_tmp = cp;
636 for (i = 0; i < _scp_nitems; ++i) {
637 if (_items[i] != NULL) {
638 memcpy(cp_tmp, _items[i], lengths[i]);
639 cp_tmp += lengths[i];
640 *cp_tmp++ = separator;
641 }
642 }
643 *--cp_tmp = '\0'; // Replace the extra separator.
644 return cp;
645 }
646
647 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
648 char*
649 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
650 char *cp;
651
652 assert(str != NULL, "just checking");
653 if (path == NULL) {
654 size_t len = strlen(str) + 1;
655 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
656 memcpy(cp, str, len); // copy the trailing null
657 } else {
658 const char separator = *os::path_separator();
659 size_t old_len = strlen(path);
660 size_t str_len = strlen(str);
661 size_t len = old_len + str_len + 2;
662
663 if (prepend) {
664 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
665 char* cp_tmp = cp;
666 memcpy(cp_tmp, str, str_len);
667 cp_tmp += str_len;
668 *cp_tmp = separator;
669 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
670 FREE_C_HEAP_ARRAY(char, path);
671 } else {
672 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
673 char* cp_tmp = cp + old_len;
674 *cp_tmp = separator;
675 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
676 }
677 }
678 return cp;
679 }
680
681 // Scan the directory and append any jar or zip files found to path.
682 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
683 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
684 DIR* dir = os::opendir(directory);
685 if (dir == NULL) return path;
686
687 char dir_sep[2] = { '\0', '\0' };
688 size_t directory_len = strlen(directory);
689 const char fileSep = *os::file_separator();
690 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
691
692 /* Scan the directory for jars/zips, appending them to path. */
693 struct dirent *entry;
694 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
695 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
696 const char* name = entry->d_name;
697 const char* ext = name + strlen(name) - 4;
698 bool isJarOrZip = ext > name &&
699 (os::file_name_strcmp(ext, ".jar") == 0 ||
700 os::file_name_strcmp(ext, ".zip") == 0);
701 if (isJarOrZip) {
702 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
703 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
704 path = add_to_path(path, jarpath, false);
705 FREE_C_HEAP_ARRAY(char, jarpath);
706 }
707 }
708 FREE_C_HEAP_ARRAY(char, dbuf);
709 os::closedir(dir);
710 return path;
711 }
712
713 // Parses a memory size specification string.
714 static bool atomull(const char *s, julong* result) {
715 julong n = 0;
716 int args_read = 0;
717 bool is_hex = false;
718 // Skip leading 0[xX] for hexadecimal
719 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
720 s += 2;
721 is_hex = true;
722 args_read = sscanf(s, JULONG_FORMAT_X, &n);
723 } else {
724 args_read = sscanf(s, JULONG_FORMAT, &n);
725 }
726 if (args_read != 1) {
727 return false;
728 }
729 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
730 s++;
731 }
732 // 4705540: illegal if more characters are found after the first non-digit
733 if (strlen(s) > 1) {
734 return false;
735 }
736 switch (*s) {
737 case 'T': case 't':
738 *result = n * G * K;
739 // Check for overflow.
740 if (*result/((julong)G * K) != n) return false;
741 return true;
742 case 'G': case 'g':
743 *result = n * G;
744 if (*result/G != n) return false;
745 return true;
746 case 'M': case 'm':
747 *result = n * M;
748 if (*result/M != n) return false;
749 return true;
750 case 'K': case 'k':
751 *result = n * K;
752 if (*result/K != n) return false;
753 return true;
754 case '\0':
755 *result = n;
756 return true;
757 default:
758 return false;
759 }
760 }
761
762 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
763 if (size < min_size) return arg_too_small;
764 // Check that size will fit in a size_t (only relevant on 32-bit)
765 if (size > max_uintx) return arg_too_big;
766 return arg_in_range;
767 }
768
769 // Describe an argument out of range error
770 void Arguments::describe_range_error(ArgsRange errcode) {
771 switch(errcode) {
772 case arg_too_big:
773 jio_fprintf(defaultStream::error_stream(),
774 "The specified size exceeds the maximum "
775 "representable size.\n");
776 break;
777 case arg_too_small:
778 case arg_unreadable:
779 case arg_in_range:
780 // do nothing for now
781 break;
782 default:
783 ShouldNotReachHere();
784 }
785 }
786
787 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
788 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
789 return true;
790 } else {
791 return false;
792 }
793 }
794
795 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
796 double v;
797 if (sscanf(value, "%lf", &v) != 1) {
798 return false;
799 }
800
801 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
802 return true;
803 }
804 return false;
805 }
806
807 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
808 julong v;
809 int int_v;
810 intx intx_v;
811 bool is_neg = false;
812 // Check the sign first since atomull() parses only unsigned values.
813 if (*value == '-') {
814 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
815 return false;
816 }
817 value++;
818 is_neg = true;
819 }
820 if (!atomull(value, &v)) {
821 return false;
822 }
823 int_v = (int) v;
824 if (is_neg) {
825 int_v = -int_v;
826 }
827 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
828 return true;
829 }
830 uint uint_v = (uint) v;
831 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
832 return true;
833 }
834 intx_v = (intx) v;
835 if (is_neg) {
836 intx_v = -intx_v;
837 }
838 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
839 return true;
840 }
841 uintx uintx_v = (uintx) v;
842 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
843 return true;
844 }
845 uint64_t uint64_t_v = (uint64_t) v;
846 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
847 return true;
848 }
849 size_t size_t_v = (size_t) v;
850 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
851 return true;
852 }
853 return false;
854 }
855
856 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
857 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
858 // Contract: CommandLineFlags always returns a pointer that needs freeing.
859 FREE_C_HEAP_ARRAY(char, value);
860 return true;
861 }
862
863 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
864 const char* old_value = "";
865 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
866 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
867 size_t new_len = strlen(new_value);
868 const char* value;
869 char* free_this_too = NULL;
870 if (old_len == 0) {
871 value = new_value;
872 } else if (new_len == 0) {
873 value = old_value;
874 } else {
875 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
876 // each new setting adds another LINE to the switch:
877 sprintf(buf, "%s\n%s", old_value, new_value);
878 value = buf;
879 free_this_too = buf;
880 }
881 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
882 // CommandLineFlags always returns a pointer that needs freeing.
883 FREE_C_HEAP_ARRAY(char, value);
884 if (free_this_too != NULL) {
885 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
886 FREE_C_HEAP_ARRAY(char, free_this_too);
887 }
888 return true;
889 }
890
891 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
892 const char* real_name = real_flag_name(arg);
893 JDK_Version since = JDK_Version();
894 switch (is_deprecated_flag(arg, &since)) {
895 case -1:
896 return NULL; // obsolete or expired, don't process normally
897 case 0:
898 return real_name;
899 case 1: {
900 if (warn) {
901 char version[256];
902 since.to_string(version, sizeof(version));
903 if (real_name != arg) {
904 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
905 arg, version, real_name);
906 } else {
907 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
908 arg, version);
909 }
910 }
911 return real_name;
912 }
913 }
914 ShouldNotReachHere();
915 return NULL;
916 }
917
918 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
919
920 // range of acceptable characters spelled out for portability reasons
921 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
922 #define BUFLEN 255
923 char name[BUFLEN+1];
924 char dummy;
925 const char* real_name;
926 bool warn_if_deprecated = true;
927
928 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
929 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
930 if (real_name == NULL) {
931 return false;
932 }
933 return set_bool_flag(real_name, false, origin);
934 }
935 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
936 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
937 if (real_name == NULL) {
938 return false;
939 }
940 return set_bool_flag(real_name, true, origin);
941 }
942
943 char punct;
944 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
945 const char* value = strchr(arg, '=') + 1;
946 Flag* flag;
947
948 // this scanf pattern matches both strings (handled here) and numbers (handled later))
949 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
950 if (real_name == NULL) {
951 return false;
952 }
953 flag = Flag::find_flag(real_name);
954 if (flag != NULL && flag->is_ccstr()) {
955 if (flag->ccstr_accumulates()) {
956 return append_to_string_flag(real_name, value, origin);
957 } else {
958 if (value[0] == '\0') {
959 value = NULL;
960 }
961 return set_string_flag(real_name, value, origin);
962 }
963 } else {
964 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
965 }
966 }
967
968 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
969 const char* value = strchr(arg, '=') + 1;
970 // -XX:Foo:=xxx will reset the string flag to the given value.
971 if (value[0] == '\0') {
972 value = NULL;
973 }
974 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
975 if (real_name == NULL) {
976 return false;
977 }
978 return set_string_flag(real_name, value, origin);
979 }
980
981 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
982 #define SIGNED_NUMBER_RANGE "[-0123456789]"
983 #define NUMBER_RANGE "[0123456789]"
984 char value[BUFLEN + 1];
985 char value2[BUFLEN + 1];
986 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
987 // Looks like a floating-point number -- try again with more lenient format string
988 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
989 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
990 if (real_name == NULL) {
991 return false;
992 }
993 return set_fp_numeric_flag(real_name, value, origin);
994 }
995 }
996
997 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
998 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
999 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1000 if (real_name == NULL) {
1001 return false;
1002 }
1003 return set_numeric_flag(real_name, value, origin);
1004 }
1005
1006 return false;
1007 }
1008
1009 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1010 assert(bldarray != NULL, "illegal argument");
1011
1012 if (arg == NULL) {
1013 return;
1014 }
1015
1016 int new_count = *count + 1;
1017
1018 // expand the array and add arg to the last element
1019 if (*bldarray == NULL) {
1020 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1021 } else {
1022 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1023 }
1024 (*bldarray)[*count] = os::strdup_check_oom(arg);
1025 *count = new_count;
1026 }
1027
1028 void Arguments::build_jvm_args(const char* arg) {
1029 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1030 }
1031
1032 void Arguments::build_jvm_flags(const char* arg) {
1033 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1034 }
1035
1036 // utility function to return a string that concatenates all
1037 // strings in a given char** array
1038 const char* Arguments::build_resource_string(char** args, int count) {
1039 if (args == NULL || count == 0) {
1040 return NULL;
1041 }
1042 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1043 for (int i = 1; i < count; i++) {
1044 length += strlen(args[i]) + 1; // add 1 for a space
1045 }
1046 char* s = NEW_RESOURCE_ARRAY(char, length);
1047 strcpy(s, args[0]);
1048 for (int j = 1; j < count; j++) {
1049 strcat(s, " ");
1050 strcat(s, args[j]);
1051 }
1052 return (const char*) s;
1053 }
1054
1055 void Arguments::print_on(outputStream* st) {
1056 st->print_cr("VM Arguments:");
1057 if (num_jvm_flags() > 0) {
1058 st->print("jvm_flags: "); print_jvm_flags_on(st);
1059 st->cr();
1060 }
1061 if (num_jvm_args() > 0) {
1062 st->print("jvm_args: "); print_jvm_args_on(st);
1063 st->cr();
1064 }
1065 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1066 if (_java_class_path != NULL) {
1067 char* path = _java_class_path->value();
1068 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1069 }
1070 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1071 }
1072
1073 void Arguments::print_summary_on(outputStream* st) {
1074 // Print the command line. Environment variables that are helpful for
1075 // reproducing the problem are written later in the hs_err file.
1076 // flags are from setting file
1077 if (num_jvm_flags() > 0) {
1078 st->print_raw("Settings File: ");
1079 print_jvm_flags_on(st);
1080 st->cr();
1081 }
1082 // args are the command line and environment variable arguments.
1083 st->print_raw("Command Line: ");
1084 if (num_jvm_args() > 0) {
1085 print_jvm_args_on(st);
1086 }
1087 // this is the classfile and any arguments to the java program
1088 if (java_command() != NULL) {
1089 st->print("%s", java_command());
1090 }
1091 st->cr();
1092 }
1093
1094 void Arguments::print_jvm_flags_on(outputStream* st) {
1095 if (_num_jvm_flags > 0) {
1096 for (int i=0; i < _num_jvm_flags; i++) {
1097 st->print("%s ", _jvm_flags_array[i]);
1098 }
1099 }
1100 }
1101
1102 void Arguments::print_jvm_args_on(outputStream* st) {
1103 if (_num_jvm_args > 0) {
1104 for (int i=0; i < _num_jvm_args; i++) {
1105 st->print("%s ", _jvm_args_array[i]);
1106 }
1107 }
1108 }
1109
1110 bool Arguments::process_argument(const char* arg,
1111 jboolean ignore_unrecognized,
1112 Flag::Flags origin) {
1113 JDK_Version since = JDK_Version();
1114
1115 if (parse_argument(arg, origin) || ignore_unrecognized) {
1116 return true;
1117 }
1118
1119 // Determine if the flag has '+', '-', or '=' characters.
1120 bool has_plus_minus = (*arg == '+' || *arg == '-');
1121 const char* const argname = has_plus_minus ? arg + 1 : arg;
1122
1123 size_t arg_len;
1124 const char* equal_sign = strchr(argname, '=');
1125 if (equal_sign == NULL) {
1126 arg_len = strlen(argname);
1127 } else {
1128 arg_len = equal_sign - argname;
1129 }
1130
1131 // Only make the obsolete check for valid arguments.
1132 if (arg_len <= BUFLEN) {
1133 // Construct a string which consists only of the argument name without '+', '-', or '='.
1134 char stripped_argname[BUFLEN+1];
1135 strncpy(stripped_argname, argname, arg_len);
1136 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1137
1138 if (is_obsolete_flag(stripped_argname, &since)) {
1139 char version[256];
1140 since.to_string(version, sizeof(version));
1141 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1142 return true;
1143 }
1144 }
1145
1146 // For locked flags, report a custom error message if available.
1147 // Otherwise, report the standard unrecognized VM option.
1148 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1149 if (found_flag != NULL) {
1150 char locked_message_buf[BUFLEN];
1151 found_flag->get_locked_message(locked_message_buf, BUFLEN);
1152 if (strlen(locked_message_buf) == 0) {
1153 if (found_flag->is_bool() && !has_plus_minus) {
1154 jio_fprintf(defaultStream::error_stream(),
1155 "Missing +/- setting for VM option '%s'\n", argname);
1156 } else if (!found_flag->is_bool() && has_plus_minus) {
1157 jio_fprintf(defaultStream::error_stream(),
1158 "Unexpected +/- setting in VM option '%s'\n", argname);
1159 } else {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Improperly specified VM option '%s'\n", argname);
1162 }
1163 } else {
1164 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1165 }
1166 } else {
1167 jio_fprintf(defaultStream::error_stream(),
1168 "Unrecognized VM option '%s'\n", argname);
1169 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1170 if (fuzzy_matched != NULL) {
1171 jio_fprintf(defaultStream::error_stream(),
1172 "Did you mean '%s%s%s'? ",
1173 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1174 fuzzy_matched->_name,
1175 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1176 }
1177 }
1178
1179 // allow for commandline "commenting out" options like -XX:#+Verbose
1180 return arg[0] == '#';
1181 }
1182
1183 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1184 FILE* stream = fopen(file_name, "rb");
1185 if (stream == NULL) {
1186 if (should_exist) {
1187 jio_fprintf(defaultStream::error_stream(),
1188 "Could not open settings file %s\n", file_name);
1189 return false;
1190 } else {
1191 return true;
1192 }
1193 }
1194
1195 char token[1024];
1196 int pos = 0;
1197
1198 bool in_white_space = true;
1199 bool in_comment = false;
1200 bool in_quote = false;
1201 char quote_c = 0;
1202 bool result = true;
1203
1204 int c = getc(stream);
1205 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1206 if (in_white_space) {
1207 if (in_comment) {
1208 if (c == '\n') in_comment = false;
1209 } else {
1210 if (c == '#') in_comment = true;
1211 else if (!isspace(c)) {
1212 in_white_space = false;
1213 token[pos++] = c;
1214 }
1215 }
1216 } else {
1217 if (c == '\n' || (!in_quote && isspace(c))) {
1218 // token ends at newline, or at unquoted whitespace
1219 // this allows a way to include spaces in string-valued options
1220 token[pos] = '\0';
1221 logOption(token);
1222 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1223 build_jvm_flags(token);
1224 pos = 0;
1225 in_white_space = true;
1226 in_quote = false;
1227 } else if (!in_quote && (c == '\'' || c == '"')) {
1228 in_quote = true;
1229 quote_c = c;
1230 } else if (in_quote && (c == quote_c)) {
1231 in_quote = false;
1232 } else {
1233 token[pos++] = c;
1234 }
1235 }
1236 c = getc(stream);
1237 }
1238 if (pos > 0) {
1239 token[pos] = '\0';
1240 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1241 build_jvm_flags(token);
1242 }
1243 fclose(stream);
1244 return result;
1245 }
1246
1247 //=============================================================================================================
1248 // Parsing of properties (-D)
1249
1250 const char* Arguments::get_property(const char* key) {
1251 return PropertyList_get_value(system_properties(), key);
1252 }
1253
1254 bool Arguments::add_property(const char* prop) {
1255 const char* eq = strchr(prop, '=');
1256 char* key;
1257 // ns must be static--its address may be stored in a SystemProperty object.
1258 const static char ns[1] = {0};
1259 char* value = (char *)ns;
1260
1261 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1262 key = AllocateHeap(key_len + 1, mtInternal);
1263 strncpy(key, prop, key_len);
1264 key[key_len] = '\0';
1265
1266 if (eq != NULL) {
1267 size_t value_len = strlen(prop) - key_len - 1;
1268 value = AllocateHeap(value_len + 1, mtInternal);
1269 strncpy(value, &prop[key_len + 1], value_len + 1);
1270 }
1271
1272 if (strcmp(key, "java.compiler") == 0) {
1273 process_java_compiler_argument(value);
1274 FreeHeap(key);
1275 if (eq != NULL) {
1276 FreeHeap(value);
1277 }
1278 return true;
1279 } else if (strcmp(key, "sun.java.command") == 0) {
1280 _java_command = value;
1281
1282 // Record value in Arguments, but let it get passed to Java.
1283 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1284 strcmp(key, "sun.java.launcher.pid") == 0) {
1285 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1286 // private and are processed in process_sun_java_launcher_properties();
1287 // the sun.java.launcher property is passed on to the java application
1288 FreeHeap(key);
1289 if (eq != NULL) {
1290 FreeHeap(value);
1291 }
1292 return true;
1293 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1294 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1295 // its value without going through the property list or making a Java call.
1296 _java_vendor_url_bug = value;
1297 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1298 PropertyList_unique_add(&_system_properties, key, value, true);
1299 return true;
1300 }
1301 // Create new property and add at the end of the list
1302 PropertyList_unique_add(&_system_properties, key, value);
1303 return true;
1304 }
1305
1306 //===========================================================================================================
1307 // Setting int/mixed/comp mode flags
1308
1309 void Arguments::set_mode_flags(Mode mode) {
1310 // Set up default values for all flags.
1311 // If you add a flag to any of the branches below,
1312 // add a default value for it here.
1313 set_java_compiler(false);
1314 _mode = mode;
1315
1316 // Ensure Agent_OnLoad has the correct initial values.
1317 // This may not be the final mode; mode may change later in onload phase.
1318 PropertyList_unique_add(&_system_properties, "java.vm.info",
1319 (char*)VM_Version::vm_info_string(), false);
1320
1321 UseInterpreter = true;
1322 UseCompiler = true;
1323 UseLoopCounter = true;
1324
1325 // Default values may be platform/compiler dependent -
1326 // use the saved values
1327 ClipInlining = Arguments::_ClipInlining;
1328 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1329 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1330 BackgroundCompilation = Arguments::_BackgroundCompilation;
1331 if (TieredCompilation) {
1332 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1333 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1334 }
1335 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1336 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1337 }
1338 }
1339
1340 // Change from defaults based on mode
1341 switch (mode) {
1342 default:
1343 ShouldNotReachHere();
1344 break;
1345 case _int:
1346 UseCompiler = false;
1347 UseLoopCounter = false;
1348 AlwaysCompileLoopMethods = false;
1349 UseOnStackReplacement = false;
1350 break;
1351 case _mixed:
1352 // same as default
1353 break;
1354 case _comp:
1355 UseInterpreter = false;
1356 BackgroundCompilation = false;
1357 ClipInlining = false;
1358 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1359 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1360 // compile a level 4 (C2) and then continue executing it.
1361 if (TieredCompilation) {
1362 Tier3InvokeNotifyFreqLog = 0;
1363 Tier4InvocationThreshold = 0;
1364 }
1365 break;
1366 }
1367 }
1368
1369 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1370 // Conflict: required to use shared spaces (-Xshare:on), but
1371 // incompatible command line options were chosen.
1372
1373 static void no_shared_spaces(const char* message) {
1374 if (RequireSharedSpaces) {
1375 jio_fprintf(defaultStream::error_stream(),
1376 "Class data sharing is inconsistent with other specified options.\n");
1377 vm_exit_during_initialization("Unable to use shared archive.", message);
1378 } else {
1379 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1380 }
1381 }
1382 #endif
1383
1384 // Returns threshold scaled with the value of scale.
1385 // If scale < 0.0, threshold is returned without scaling.
1386 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1387 if (scale == 1.0 || scale < 0.0) {
1388 return threshold;
1389 } else {
1390 return (intx)(threshold * scale);
1391 }
1392 }
1393
1394 // Returns freq_log scaled with the value of scale.
1395 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1396 // If scale < 0.0, freq_log is returned without scaling.
1397 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1398 // Check if scaling is necessary or if negative value was specified.
1399 if (scale == 1.0 || scale < 0.0) {
1400 return freq_log;
1401 }
1402 // Check values to avoid calculating log2 of 0.
1403 if (scale == 0.0 || freq_log == 0) {
1404 return 0;
1405 }
1406 // Determine the maximum notification frequency value currently supported.
1407 // The largest mask value that the interpreter/C1 can handle is
1408 // of length InvocationCounter::number_of_count_bits. Mask values are always
1409 // one bit shorter then the value of the notification frequency. Set
1410 // max_freq_bits accordingly.
1411 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1412 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1413 if (scaled_freq == 0) {
1414 // Return 0 right away to avoid calculating log2 of 0.
1415 return 0;
1416 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1417 return max_freq_bits;
1418 } else {
1419 return log2_intptr(scaled_freq);
1420 }
1421 }
1422
1423 void Arguments::set_tiered_flags() {
1424 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1425 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1426 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1427 }
1428 if (CompilationPolicyChoice < 2) {
1429 vm_exit_during_initialization(
1430 "Incompatible compilation policy selected", NULL);
1431 }
1432 // Increase the code cache size - tiered compiles a lot more.
1433 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1434 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1435 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1436 }
1437 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1438 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1439 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1440
1441 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1442 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1443 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1444 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1445 }
1446 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1447 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1448 }
1449 // Check consistency of code heap sizes
1450 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1451 jio_fprintf(defaultStream::error_stream(),
1452 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1453 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1454 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1455 vm_exit(1);
1456 }
1457 }
1458 }
1459 if (!UseInterpreter) { // -Xcomp
1460 Tier3InvokeNotifyFreqLog = 0;
1461 Tier4InvocationThreshold = 0;
1462 }
1463
1464 if (CompileThresholdScaling < 0) {
1465 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1466 }
1467
1468 // Scale tiered compilation thresholds.
1469 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1470 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1471 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1472 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1473
1474 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1475 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1476 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1477 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1478
1479 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1480 // once these thresholds become supported.
1481
1482 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1483 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1484
1485 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1486 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1487
1488 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1489
1490 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1491 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1492 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1493 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1494 }
1495 }
1496
1497 #if INCLUDE_ALL_GCS
1498 static void disable_adaptive_size_policy(const char* collector_name) {
1499 if (UseAdaptiveSizePolicy) {
1500 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1501 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1502 collector_name);
1503 }
1504 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1505 }
1506 }
1507
1508 void Arguments::set_parnew_gc_flags() {
1509 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1510 "control point invariant");
1511 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1512 assert(UseParNewGC, "ParNew should always be used with CMS");
1513
1514 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1515 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1516 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1517 } else if (ParallelGCThreads == 0) {
1518 jio_fprintf(defaultStream::error_stream(),
1519 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1520 vm_exit(1);
1521 }
1522
1523 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1524 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1525 // we set them to 1024 and 1024.
1526 // See CR 6362902.
1527 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1528 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1529 }
1530 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1531 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1532 }
1533
1534 // When using compressed oops, we use local overflow stacks,
1535 // rather than using a global overflow list chained through
1536 // the klass word of the object's pre-image.
1537 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1538 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1539 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1540 }
1541 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1542 }
1543 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1544 }
1545
1546 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1547 // sparc/solaris for certain applications, but would gain from
1548 // further optimization and tuning efforts, and would almost
1549 // certainly gain from analysis of platform and environment.
1550 void Arguments::set_cms_and_parnew_gc_flags() {
1551 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1552 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1553 assert(UseParNewGC, "ParNew should always be used with CMS");
1554
1555 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1556 disable_adaptive_size_policy("UseConcMarkSweepGC");
1557
1558 set_parnew_gc_flags();
1559
1560 size_t max_heap = align_size_down(MaxHeapSize,
1561 CardTableRS::ct_max_alignment_constraint());
1562
1563 // Now make adjustments for CMS
1564 intx tenuring_default = (intx)6;
1565 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1566
1567 // Preferred young gen size for "short" pauses:
1568 // upper bound depends on # of threads and NewRatio.
1569 const size_t preferred_max_new_size_unaligned =
1570 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1571 size_t preferred_max_new_size =
1572 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1573
1574 // Unless explicitly requested otherwise, size young gen
1575 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1576
1577 // If either MaxNewSize or NewRatio is set on the command line,
1578 // assume the user is trying to set the size of the young gen.
1579 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1580
1581 // Set MaxNewSize to our calculated preferred_max_new_size unless
1582 // NewSize was set on the command line and it is larger than
1583 // preferred_max_new_size.
1584 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1585 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1586 } else {
1587 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1588 }
1589 if (PrintGCDetails && Verbose) {
1590 // Too early to use gclog_or_tty
1591 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1592 }
1593
1594 // Code along this path potentially sets NewSize and OldSize
1595 if (PrintGCDetails && Verbose) {
1596 // Too early to use gclog_or_tty
1597 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1598 " initial_heap_size: " SIZE_FORMAT
1599 " max_heap: " SIZE_FORMAT,
1600 min_heap_size(), InitialHeapSize, max_heap);
1601 }
1602 size_t min_new = preferred_max_new_size;
1603 if (FLAG_IS_CMDLINE(NewSize)) {
1604 min_new = NewSize;
1605 }
1606 if (max_heap > min_new && min_heap_size() > min_new) {
1607 // Unless explicitly requested otherwise, make young gen
1608 // at least min_new, and at most preferred_max_new_size.
1609 if (FLAG_IS_DEFAULT(NewSize)) {
1610 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1611 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1612 if (PrintGCDetails && Verbose) {
1613 // Too early to use gclog_or_tty
1614 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1615 }
1616 }
1617 // Unless explicitly requested otherwise, size old gen
1618 // so it's NewRatio x of NewSize.
1619 if (FLAG_IS_DEFAULT(OldSize)) {
1620 if (max_heap > NewSize) {
1621 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1622 if (PrintGCDetails && Verbose) {
1623 // Too early to use gclog_or_tty
1624 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1625 }
1626 }
1627 }
1628 }
1629 }
1630 // Unless explicitly requested otherwise, definitely
1631 // promote all objects surviving "tenuring_default" scavenges.
1632 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1633 FLAG_IS_DEFAULT(SurvivorRatio)) {
1634 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1635 }
1636 // If we decided above (or user explicitly requested)
1637 // `promote all' (via MaxTenuringThreshold := 0),
1638 // prefer minuscule survivor spaces so as not to waste
1639 // space for (non-existent) survivors
1640 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1641 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1642 }
1643
1644 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1645 // but rather the number of free blocks of a given size that are used when
1646 // replenishing the local per-worker free list caches.
1647 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1648 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1649 // OldPLAB sizing manually turned off: Use a larger default setting,
1650 // unless it was manually specified. This is because a too-low value
1651 // will slow down scavenges.
1652 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1653 } else {
1654 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1655 }
1656 }
1657
1658 // If either of the static initialization defaults have changed, note this
1659 // modification.
1660 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1661 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1662 }
1663
1664 if (!ClassUnloading) {
1665 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1666 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1667 }
1668
1669 if (PrintGCDetails && Verbose) {
1670 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1671 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1672 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1673 }
1674 }
1675 #endif // INCLUDE_ALL_GCS
1676
1677 void set_object_alignment() {
1678 // Object alignment.
1679 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1680 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1681 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1682 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1683 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1684 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1685
1686 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1687 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1688
1689 // Oop encoding heap max
1690 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1691
1692 if (SurvivorAlignmentInBytes == 0) {
1693 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1694 }
1695
1696 #if INCLUDE_ALL_GCS
1697 // Set CMS global values
1698 CompactibleFreeListSpace::set_cms_values();
1699 #endif // INCLUDE_ALL_GCS
1700 }
1701
1702 size_t Arguments::max_heap_for_compressed_oops() {
1703 // Avoid sign flip.
1704 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1705 // We need to fit both the NULL page and the heap into the memory budget, while
1706 // keeping alignment constraints of the heap. To guarantee the latter, as the
1707 // NULL page is located before the heap, we pad the NULL page to the conservative
1708 // maximum alignment that the GC may ever impose upon the heap.
1709 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1710 _conservative_max_heap_alignment);
1711
1712 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1713 NOT_LP64(ShouldNotReachHere(); return 0);
1714 }
1715
1716 bool Arguments::should_auto_select_low_pause_collector() {
1717 if (UseAutoGCSelectPolicy &&
1718 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1719 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1720 if (PrintGCDetails) {
1721 // Cannot use gclog_or_tty yet.
1722 tty->print_cr("Automatic selection of the low pause collector"
1723 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1724 }
1725 return true;
1726 }
1727 return false;
1728 }
1729
1730 void Arguments::set_use_compressed_oops() {
1731 #ifndef ZERO
1732 #ifdef _LP64
1733 // MaxHeapSize is not set up properly at this point, but
1734 // the only value that can override MaxHeapSize if we are
1735 // to use UseCompressedOops is InitialHeapSize.
1736 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1737
1738 if (max_heap_size <= max_heap_for_compressed_oops()) {
1739 #if !defined(COMPILER1) || defined(TIERED)
1740 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1741 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1742 }
1743 #endif
1744 } else {
1745 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1746 warning("Max heap size too large for Compressed Oops");
1747 FLAG_SET_DEFAULT(UseCompressedOops, false);
1748 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1749 }
1750 }
1751 #endif // _LP64
1752 #endif // ZERO
1753 }
1754
1755
1756 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1757 // set_use_compressed_oops().
1758 void Arguments::set_use_compressed_klass_ptrs() {
1759 #ifndef ZERO
1760 #ifdef _LP64
1761 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1762 if (!UseCompressedOops) {
1763 if (UseCompressedClassPointers) {
1764 warning("UseCompressedClassPointers requires UseCompressedOops");
1765 }
1766 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1767 } else {
1768 // Turn on UseCompressedClassPointers too
1769 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1770 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1771 }
1772 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1773 if (UseCompressedClassPointers) {
1774 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1775 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1776 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1777 }
1778 }
1779 }
1780 #endif // _LP64
1781 #endif // !ZERO
1782 }
1783
1784 void Arguments::set_conservative_max_heap_alignment() {
1785 // The conservative maximum required alignment for the heap is the maximum of
1786 // the alignments imposed by several sources: any requirements from the heap
1787 // itself, the collector policy and the maximum page size we may run the VM
1788 // with.
1789 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1790 #if INCLUDE_ALL_GCS
1791 if (UseParallelGC) {
1792 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1793 } else if (UseG1GC) {
1794 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1795 }
1796 #endif // INCLUDE_ALL_GCS
1797 _conservative_max_heap_alignment = MAX4(heap_alignment,
1798 (size_t)os::vm_allocation_granularity(),
1799 os::max_page_size(),
1800 CollectorPolicy::compute_heap_alignment());
1801 }
1802
1803 void Arguments::select_gc_ergonomically() {
1804 if (os::is_server_class_machine()) {
1805 if (should_auto_select_low_pause_collector()) {
1806 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1807 } else {
1808 #if defined(JAVASE_EMBEDDED)
1809 FLAG_SET_ERGO(bool, UseParallelGC, true);
1810 #else
1811 FLAG_SET_ERGO(bool, UseG1GC, true);
1812 #endif
1813 }
1814 } else {
1815 FLAG_SET_ERGO(bool, UseSerialGC, true);
1816 }
1817 }
1818
1819 void Arguments::select_gc() {
1820 if (!gc_selected()) {
1821 select_gc_ergonomically();
1822 guarantee(gc_selected(), "No GC selected");
1823 }
1824 }
1825
1826 void Arguments::set_ergonomics_flags() {
1827 select_gc();
1828
1829 #ifdef COMPILER2
1830 // Shared spaces work fine with other GCs but causes bytecode rewriting
1831 // to be disabled, which hurts interpreter performance and decreases
1832 // server performance. When -server is specified, keep the default off
1833 // unless it is asked for. Future work: either add bytecode rewriting
1834 // at link time, or rewrite bytecodes in non-shared methods.
1835 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1836 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1837 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1838 }
1839 #endif
1840
1841 set_conservative_max_heap_alignment();
1842
1843 #ifndef ZERO
1844 #ifdef _LP64
1845 set_use_compressed_oops();
1846
1847 // set_use_compressed_klass_ptrs() must be called after calling
1848 // set_use_compressed_oops().
1849 set_use_compressed_klass_ptrs();
1850
1851 // Also checks that certain machines are slower with compressed oops
1852 // in vm_version initialization code.
1853 #endif // _LP64
1854 #endif // !ZERO
1855
1856 // Set up runtime image flags.
1857 set_runtime_image_flags();
1858
1859 CodeCacheExtensions::set_ergonomics_flags();
1860 }
1861
1862 void Arguments::set_parallel_gc_flags() {
1863 assert(UseParallelGC || UseParallelOldGC, "Error");
1864 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1865 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1866 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1867 }
1868 FLAG_SET_DEFAULT(UseParallelGC, true);
1869
1870 // If no heap maximum was requested explicitly, use some reasonable fraction
1871 // of the physical memory, up to a maximum of 1GB.
1872 FLAG_SET_DEFAULT(ParallelGCThreads,
1873 Abstract_VM_Version::parallel_worker_threads());
1874 if (ParallelGCThreads == 0) {
1875 jio_fprintf(defaultStream::error_stream(),
1876 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1877 vm_exit(1);
1878 }
1879
1880 if (UseAdaptiveSizePolicy) {
1881 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1882 // unless the user actually sets these flags.
1883 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1884 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1885 }
1886 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1887 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1888 }
1889 }
1890
1891 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1892 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1893 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1894 // See CR 6362902 for details.
1895 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1896 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1897 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1898 }
1899 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1900 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1901 }
1902 }
1903
1904 if (UseParallelOldGC) {
1905 // Par compact uses lower default values since they are treated as
1906 // minimums. These are different defaults because of the different
1907 // interpretation and are not ergonomically set.
1908 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1909 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1910 }
1911 }
1912 }
1913
1914 void Arguments::set_g1_gc_flags() {
1915 assert(UseG1GC, "Error");
1916 #ifdef COMPILER1
1917 FastTLABRefill = false;
1918 #endif
1919 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1920 if (ParallelGCThreads == 0) {
1921 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1922 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1923 }
1924
1925 #if INCLUDE_ALL_GCS
1926 if (G1ConcRefinementThreads == 0) {
1927 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1928 }
1929 #endif
1930
1931 // MarkStackSize will be set (if it hasn't been set by the user)
1932 // when concurrent marking is initialized.
1933 // Its value will be based upon the number of parallel marking threads.
1934 // But we do set the maximum mark stack size here.
1935 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1936 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1937 }
1938
1939 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1940 // In G1, we want the default GC overhead goal to be higher than
1941 // say in PS. So we set it here to 10%. Otherwise the heap might
1942 // be expanded more aggressively than we would like it to. In
1943 // fact, even 10% seems to not be high enough in some cases
1944 // (especially small GC stress tests that the main thing they do
1945 // is allocation). We might consider increase it further.
1946 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1947 }
1948
1949 if (PrintGCDetails && Verbose) {
1950 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1951 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1952 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1953 }
1954 }
1955
1956 #if !INCLUDE_ALL_GCS
1957 #ifdef ASSERT
1958 static bool verify_serial_gc_flags() {
1959 return (UseSerialGC &&
1960 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1961 UseParallelGC || UseParallelOldGC));
1962 }
1963 #endif // ASSERT
1964 #endif // INCLUDE_ALL_GCS
1965
1966 void Arguments::set_gc_specific_flags() {
1967 #if INCLUDE_ALL_GCS
1968 // Set per-collector flags
1969 if (UseParallelGC || UseParallelOldGC) {
1970 set_parallel_gc_flags();
1971 } else if (UseConcMarkSweepGC) {
1972 set_cms_and_parnew_gc_flags();
1973 } else if (UseG1GC) {
1974 set_g1_gc_flags();
1975 }
1976 if (AssumeMP && !UseSerialGC) {
1977 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1978 warning("If the number of processors is expected to increase from one, then"
1979 " you should configure the number of parallel GC threads appropriately"
1980 " using -XX:ParallelGCThreads=N");
1981 }
1982 }
1983 if (MinHeapFreeRatio == 100) {
1984 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1985 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1986 }
1987 #else // INCLUDE_ALL_GCS
1988 assert(verify_serial_gc_flags(), "SerialGC unset");
1989 #endif // INCLUDE_ALL_GCS
1990 }
1991
1992 julong Arguments::limit_by_allocatable_memory(julong limit) {
1993 julong max_allocatable;
1994 julong result = limit;
1995 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1996 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1997 }
1998 return result;
1999 }
2000
2001 // Use static initialization to get the default before parsing
2002 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2003
2004 void Arguments::set_heap_size() {
2005 const julong phys_mem =
2006 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2007 : (julong)MaxRAM;
2008
2009 // If the maximum heap size has not been set with -Xmx,
2010 // then set it as fraction of the size of physical memory,
2011 // respecting the maximum and minimum sizes of the heap.
2012 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2013 julong reasonable_max = phys_mem / MaxRAMFraction;
2014
2015 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2016 // Small physical memory, so use a minimum fraction of it for the heap
2017 reasonable_max = phys_mem / MinRAMFraction;
2018 } else {
2019 // Not-small physical memory, so require a heap at least
2020 // as large as MaxHeapSize
2021 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2022 }
2023 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2024 // Limit the heap size to ErgoHeapSizeLimit
2025 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2026 }
2027 if (UseCompressedOops) {
2028 // Limit the heap size to the maximum possible when using compressed oops
2029 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2030
2031 // HeapBaseMinAddress can be greater than default but not less than.
2032 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2033 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2034 // matches compressed oops printing flags
2035 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2036 jio_fprintf(defaultStream::error_stream(),
2037 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2038 " (" SIZE_FORMAT "G) which is greater than value given "
2039 SIZE_FORMAT "\n",
2040 DefaultHeapBaseMinAddress,
2041 DefaultHeapBaseMinAddress/G,
2042 HeapBaseMinAddress);
2043 }
2044 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2045 }
2046 }
2047
2048 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2049 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2050 // but it should be not less than default MaxHeapSize.
2051 max_coop_heap -= HeapBaseMinAddress;
2052 }
2053 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2054 }
2055 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2056
2057 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2058 // An initial heap size was specified on the command line,
2059 // so be sure that the maximum size is consistent. Done
2060 // after call to limit_by_allocatable_memory because that
2061 // method might reduce the allocation size.
2062 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2063 }
2064
2065 if (PrintGCDetails && Verbose) {
2066 // Cannot use gclog_or_tty yet.
2067 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2068 }
2069 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2070 }
2071
2072 // If the minimum or initial heap_size have not been set or requested to be set
2073 // ergonomically, set them accordingly.
2074 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2075 julong reasonable_minimum = (julong)(OldSize + NewSize);
2076
2077 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2078
2079 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2080
2081 if (InitialHeapSize == 0) {
2082 julong reasonable_initial = phys_mem / InitialRAMFraction;
2083
2084 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2085 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2086
2087 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2088
2089 if (PrintGCDetails && Verbose) {
2090 // Cannot use gclog_or_tty yet.
2091 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2092 }
2093 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2094 }
2095 // If the minimum heap size has not been set (via -Xms),
2096 // synchronize with InitialHeapSize to avoid errors with the default value.
2097 if (min_heap_size() == 0) {
2098 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2099 if (PrintGCDetails && Verbose) {
2100 // Cannot use gclog_or_tty yet.
2101 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2102 }
2103 }
2104 }
2105 }
2106
2107 // This option inspects the machine and attempts to set various
2108 // parameters to be optimal for long-running, memory allocation
2109 // intensive jobs. It is intended for machines with large
2110 // amounts of cpu and memory.
2111 jint Arguments::set_aggressive_heap_flags() {
2112 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2113 // VM, but we may not be able to represent the total physical memory
2114 // available (like having 8gb of memory on a box but using a 32bit VM).
2115 // Thus, we need to make sure we're using a julong for intermediate
2116 // calculations.
2117 julong initHeapSize;
2118 julong total_memory = os::physical_memory();
2119
2120 if (total_memory < (julong) 256 * M) {
2121 jio_fprintf(defaultStream::error_stream(),
2122 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2123 vm_exit(1);
2124 }
2125
2126 // The heap size is half of available memory, or (at most)
2127 // all of possible memory less 160mb (leaving room for the OS
2128 // when using ISM). This is the maximum; because adaptive sizing
2129 // is turned on below, the actual space used may be smaller.
2130
2131 initHeapSize = MIN2(total_memory / (julong) 2,
2132 total_memory - (julong) 160 * M);
2133
2134 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2135
2136 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2137 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2138 return JNI_EINVAL;
2139 }
2140 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2141 return JNI_EINVAL;
2142 }
2143 // Currently the minimum size and the initial heap sizes are the same.
2144 set_min_heap_size(initHeapSize);
2145 }
2146 if (FLAG_IS_DEFAULT(NewSize)) {
2147 // Make the young generation 3/8ths of the total heap.
2148 if (FLAG_SET_CMDLINE(size_t, NewSize,
2149 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2150 return JNI_EINVAL;
2151 }
2152 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2153 return JNI_EINVAL;
2154 }
2155 }
2156
2157 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2158 FLAG_SET_DEFAULT(UseLargePages, true);
2159 #endif
2160
2161 // Increase some data structure sizes for efficiency
2162 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2163 return JNI_EINVAL;
2164 }
2165 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2166 return JNI_EINVAL;
2167 }
2168 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2169 return JNI_EINVAL;
2170 }
2171
2172 // See the OldPLABSize comment below, but replace 'after promotion'
2173 // with 'after copying'. YoungPLABSize is the size of the survivor
2174 // space per-gc-thread buffers. The default is 4kw.
2175 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2176 return JNI_EINVAL;
2177 }
2178
2179 // OldPLABSize is the size of the buffers in the old gen that
2180 // UseParallelGC uses to promote live data that doesn't fit in the
2181 // survivor spaces. At any given time, there's one for each gc thread.
2182 // The default size is 1kw. These buffers are rarely used, since the
2183 // survivor spaces are usually big enough. For specjbb, however, there
2184 // are occasions when there's lots of live data in the young gen
2185 // and we end up promoting some of it. We don't have a definite
2186 // explanation for why bumping OldPLABSize helps, but the theory
2187 // is that a bigger PLAB results in retaining something like the
2188 // original allocation order after promotion, which improves mutator
2189 // locality. A minor effect may be that larger PLABs reduce the
2190 // number of PLAB allocation events during gc. The value of 8kw
2191 // was arrived at by experimenting with specjbb.
2192 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2193 return JNI_EINVAL;
2194 }
2195
2196 // Enable parallel GC and adaptive generation sizing
2197 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2198 return JNI_EINVAL;
2199 }
2200 FLAG_SET_DEFAULT(ParallelGCThreads,
2201 Abstract_VM_Version::parallel_worker_threads());
2202
2203 // Encourage steady state memory management
2204 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2205 return JNI_EINVAL;
2206 }
2207
2208 // This appears to improve mutator locality
2209 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2210 return JNI_EINVAL;
2211 }
2212
2213 // Get around early Solaris scheduling bug
2214 // (affinity vs other jobs on system)
2215 // but disallow DR and offlining (5008695).
2216 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2217 return JNI_EINVAL;
2218 }
2219
2220 return JNI_OK;
2221 }
2222
2223 // Set up runtime image flags
2224 void Arguments::set_runtime_image_flags() {
2225 #ifdef _LP64
2226 // Memory map image file by default on 64 bit machines.
2227 if (FLAG_IS_DEFAULT(MemoryMapImage)) {
2228 FLAG_SET_ERGO(bool, MemoryMapImage, true);
2229 }
2230 #endif
2231 }
2232
2233 // This must be called after ergonomics.
2234 void Arguments::set_bytecode_flags() {
2235 if (!RewriteBytecodes) {
2236 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2237 }
2238 }
2239
2240 // Aggressive optimization flags -XX:+AggressiveOpts
2241 void Arguments::set_aggressive_opts_flags() {
2242 #ifdef COMPILER2
2243 if (AggressiveUnboxing) {
2244 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2245 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2246 } else if (!EliminateAutoBox) {
2247 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2248 AggressiveUnboxing = false;
2249 }
2250 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2251 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2252 } else if (!DoEscapeAnalysis) {
2253 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2254 AggressiveUnboxing = false;
2255 }
2256 }
2257 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2258 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2259 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2260 }
2261 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2262 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2263 }
2264
2265 // Feed the cache size setting into the JDK
2266 char buffer[1024];
2267 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2268 add_property(buffer);
2269 }
2270 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2271 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2272 }
2273 #endif
2274
2275 if (AggressiveOpts) {
2276 // Sample flag setting code
2277 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2278 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2279 // }
2280 }
2281 }
2282
2283 //===========================================================================================================
2284 // Parsing of java.compiler property
2285
2286 void Arguments::process_java_compiler_argument(char* arg) {
2287 // For backwards compatibility, Djava.compiler=NONE or ""
2288 // causes us to switch to -Xint mode UNLESS -Xdebug
2289 // is also specified.
2290 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2291 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2292 }
2293 }
2294
2295 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2296 _sun_java_launcher = os::strdup_check_oom(launcher);
2297 }
2298
2299 bool Arguments::created_by_java_launcher() {
2300 assert(_sun_java_launcher != NULL, "property must have value");
2301 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2302 }
2303
2304 bool Arguments::sun_java_launcher_is_altjvm() {
2305 return _sun_java_launcher_is_altjvm;
2306 }
2307
2308 //===========================================================================================================
2309 // Parsing of main arguments
2310
2311 // check if do gclog rotation
2312 // +UseGCLogFileRotation is a must,
2313 // no gc log rotation when log file not supplied or
2314 // NumberOfGCLogFiles is 0
2315 void check_gclog_consistency() {
2316 if (UseGCLogFileRotation) {
2317 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2318 jio_fprintf(defaultStream::output_stream(),
2319 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2320 "where num_of_file > 0\n"
2321 "GC log rotation is turned off\n");
2322 UseGCLogFileRotation = false;
2323 }
2324 }
2325
2326 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2327 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
2328 jio_fprintf(defaultStream::output_stream(),
2329 "GCLogFileSize changed to minimum 8K\n");
2330 }
2331 }
2332 }
2333
2334 // This function is called for -Xloggc:<filename>, it can be used
2335 // to check if a given file name(or string) conforms to the following
2336 // specification:
2337 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2338 // %p and %t only allowed once. We only limit usage of filename not path
2339 bool is_filename_valid(const char *file_name) {
2340 const char* p = file_name;
2341 char file_sep = os::file_separator()[0];
2342 const char* cp;
2343 // skip prefix path
2344 for (cp = file_name; *cp != '\0'; cp++) {
2345 if (*cp == '/' || *cp == file_sep) {
2346 p = cp + 1;
2347 }
2348 }
2349
2350 int count_p = 0;
2351 int count_t = 0;
2352 while (*p != '\0') {
2353 if ((*p >= '0' && *p <= '9') ||
2354 (*p >= 'A' && *p <= 'Z') ||
2355 (*p >= 'a' && *p <= 'z') ||
2356 *p == '-' ||
2357 *p == '_' ||
2358 *p == '.') {
2359 p++;
2360 continue;
2361 }
2362 if (*p == '%') {
2363 if(*(p + 1) == 'p') {
2364 p += 2;
2365 count_p ++;
2366 continue;
2367 }
2368 if (*(p + 1) == 't') {
2369 p += 2;
2370 count_t ++;
2371 continue;
2372 }
2373 }
2374 return false;
2375 }
2376 return count_p < 2 && count_t < 2;
2377 }
2378
2379 // Check consistency of GC selection
2380 bool Arguments::check_gc_consistency() {
2381 check_gclog_consistency();
2382 // Ensure that the user has not selected conflicting sets
2383 // of collectors.
2384 uint i = 0;
2385 if (UseSerialGC) i++;
2386 if (UseConcMarkSweepGC) i++;
2387 if (UseParallelGC || UseParallelOldGC) i++;
2388 if (UseG1GC) i++;
2389 if (i > 1) {
2390 jio_fprintf(defaultStream::error_stream(),
2391 "Conflicting collector combinations in option list; "
2392 "please refer to the release notes for the combinations "
2393 "allowed\n");
2394 return false;
2395 }
2396
2397 if (UseConcMarkSweepGC && !UseParNewGC) {
2398 jio_fprintf(defaultStream::error_stream(),
2399 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2400 return false;
2401 }
2402
2403 if (UseParNewGC && !UseConcMarkSweepGC) {
2404 jio_fprintf(defaultStream::error_stream(),
2405 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2406 return false;
2407 }
2408
2409 return true;
2410 }
2411
2412 // Check the consistency of vm_init_args
2413 bool Arguments::check_vm_args_consistency() {
2414 // Method for adding checks for flag consistency.
2415 // The intent is to warn the user of all possible conflicts,
2416 // before returning an error.
2417 // Note: Needs platform-dependent factoring.
2418 bool status = true;
2419
2420 if (TLABRefillWasteFraction == 0) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "TLABRefillWasteFraction should be a denominator, "
2423 "not " SIZE_FORMAT "\n",
2424 TLABRefillWasteFraction);
2425 status = false;
2426 }
2427
2428 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2429 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2430 }
2431
2432 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2433 // Settings to encourage splitting.
2434 if (!FLAG_IS_CMDLINE(NewRatio)) {
2435 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2436 status = false;
2437 }
2438 }
2439 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2440 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2441 status = false;
2442 }
2443 }
2444 }
2445
2446 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2447 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2448 }
2449
2450 if (GCTimeLimit == 100) {
2451 // Turn off gc-overhead-limit-exceeded checks
2452 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2453 }
2454
2455 status = status && check_gc_consistency();
2456
2457 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2458 // insists that we hold the requisite locks so that the iteration is
2459 // MT-safe. For the verification at start-up and shut-down, we don't
2460 // yet have a good way of acquiring and releasing these locks,
2461 // which are not visible at the CollectedHeap level. We want to
2462 // be able to acquire these locks and then do the iteration rather
2463 // than just disable the lock verification. This will be fixed under
2464 // bug 4788986.
2465 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2466 if (VerifyDuringStartup) {
2467 warning("Heap verification at start-up disabled "
2468 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2469 VerifyDuringStartup = false; // Disable verification at start-up
2470 }
2471
2472 if (VerifyBeforeExit) {
2473 warning("Heap verification at shutdown disabled "
2474 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2475 VerifyBeforeExit = false; // Disable verification at shutdown
2476 }
2477 }
2478
2479 // Note: only executed in non-PRODUCT mode
2480 if (!UseAsyncConcMarkSweepGC &&
2481 (ExplicitGCInvokesConcurrent ||
2482 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2485 " with -UseAsyncConcMarkSweepGC");
2486 status = false;
2487 }
2488
2489 if (PrintNMTStatistics) {
2490 #if INCLUDE_NMT
2491 if (MemTracker::tracking_level() == NMT_off) {
2492 #endif // INCLUDE_NMT
2493 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2494 PrintNMTStatistics = false;
2495 #if INCLUDE_NMT
2496 }
2497 #endif
2498 }
2499
2500 // Check lower bounds of the code cache
2501 // Template Interpreter code is approximately 3X larger in debug builds.
2502 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2503 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2504 jio_fprintf(defaultStream::error_stream(),
2505 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2506 os::vm_page_size()/K);
2507 status = false;
2508 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2511 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2512 status = false;
2513 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2516 min_code_cache_size/K);
2517 status = false;
2518 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2519 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2520 jio_fprintf(defaultStream::error_stream(),
2521 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2522 CODE_CACHE_SIZE_LIMIT/M);
2523 status = false;
2524 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2525 jio_fprintf(defaultStream::error_stream(),
2526 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2527 min_code_cache_size/K);
2528 status = false;
2529 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2530 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2533 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2534 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2535 status = false;
2536 }
2537
2538 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2539 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2540 }
2541
2542 return status;
2543 }
2544
2545 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2546 const char* option_type) {
2547 if (ignore) return false;
2548
2549 const char* spacer = " ";
2550 if (option_type == NULL) {
2551 option_type = ++spacer; // Set both to the empty string.
2552 }
2553
2554 if (os::obsolete_option(option)) {
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Obsolete %s%soption: %s\n", option_type, spacer,
2557 option->optionString);
2558 return false;
2559 } else {
2560 jio_fprintf(defaultStream::error_stream(),
2561 "Unrecognized %s%soption: %s\n", option_type, spacer,
2562 option->optionString);
2563 return true;
2564 }
2565 }
2566
2567 static const char* user_assertion_options[] = {
2568 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2569 };
2570
2571 static const char* system_assertion_options[] = {
2572 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2573 };
2574
2575 bool Arguments::parse_uintx(const char* value,
2576 uintx* uintx_arg,
2577 uintx min_size) {
2578
2579 // Check the sign first since atomull() parses only unsigned values.
2580 bool value_is_positive = !(*value == '-');
2581
2582 if (value_is_positive) {
2583 julong n;
2584 bool good_return = atomull(value, &n);
2585 if (good_return) {
2586 bool above_minimum = n >= min_size;
2587 bool value_is_too_large = n > max_uintx;
2588
2589 if (above_minimum && !value_is_too_large) {
2590 *uintx_arg = n;
2591 return true;
2592 }
2593 }
2594 }
2595 return false;
2596 }
2597
2598 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2599 julong* long_arg,
2600 julong min_size) {
2601 if (!atomull(s, long_arg)) return arg_unreadable;
2602 return check_memory_size(*long_arg, min_size);
2603 }
2604
2605 // Parse JavaVMInitArgs structure
2606
2607 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2608 const JavaVMInitArgs *java_options_args,
2609 const JavaVMInitArgs *cmd_line_args) {
2610 // For components of the system classpath.
2611 SysClassPath scp(Arguments::get_sysclasspath());
2612 bool scp_assembly_required = false;
2613
2614 // Save default settings for some mode flags
2615 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2616 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2617 Arguments::_ClipInlining = ClipInlining;
2618 Arguments::_BackgroundCompilation = BackgroundCompilation;
2619 if (TieredCompilation) {
2620 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2621 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2622 }
2623
2624 // Setup flags for mixed which is the default
2625 set_mode_flags(_mixed);
2626
2627 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2628 // variable (if present).
2629 jint result = parse_each_vm_init_arg(
2630 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2631 if (result != JNI_OK) {
2632 return result;
2633 }
2634
2635 // Parse args structure generated from the command line flags.
2636 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2637 Flag::COMMAND_LINE);
2638 if (result != JNI_OK) {
2639 return result;
2640 }
2641
2642 // Parse args structure generated from the _JAVA_OPTIONS environment
2643 // variable (if present) (mimics classic VM)
2644 result = parse_each_vm_init_arg(
2645 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2646 if (result != JNI_OK) {
2647 return result;
2648 }
2649
2650 // Do final processing now that all arguments have been parsed
2651 result = finalize_vm_init_args(&scp, scp_assembly_required);
2652 if (result != JNI_OK) {
2653 return result;
2654 }
2655
2656 return JNI_OK;
2657 }
2658
2659 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2660 // represents a valid JDWP agent. is_path==true denotes that we
2661 // are dealing with -agentpath (case where name is a path), otherwise with
2662 // -agentlib
2663 bool valid_jdwp_agent(char *name, bool is_path) {
2664 char *_name;
2665 const char *_jdwp = "jdwp";
2666 size_t _len_jdwp, _len_prefix;
2667
2668 if (is_path) {
2669 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2670 return false;
2671 }
2672
2673 _name++; // skip past last path separator
2674 _len_prefix = strlen(JNI_LIB_PREFIX);
2675
2676 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2677 return false;
2678 }
2679
2680 _name += _len_prefix;
2681 _len_jdwp = strlen(_jdwp);
2682
2683 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2684 _name += _len_jdwp;
2685 }
2686 else {
2687 return false;
2688 }
2689
2690 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2691 return false;
2692 }
2693
2694 return true;
2695 }
2696
2697 if (strcmp(name, _jdwp) == 0) {
2698 return true;
2699 }
2700
2701 return false;
2702 }
2703
2704 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2705 SysClassPath* scp_p,
2706 bool* scp_assembly_required_p,
2707 Flag::Flags origin) {
2708 // Remaining part of option string
2709 const char* tail;
2710
2711 // iterate over arguments
2712 for (int index = 0; index < args->nOptions; index++) {
2713 bool is_absolute_path = false; // for -agentpath vs -agentlib
2714
2715 const JavaVMOption* option = args->options + index;
2716
2717 if (!match_option(option, "-Djava.class.path", &tail) &&
2718 !match_option(option, "-Dsun.java.command", &tail) &&
2719 !match_option(option, "-Dsun.java.launcher", &tail)) {
2720
2721 // add all jvm options to the jvm_args string. This string
2722 // is used later to set the java.vm.args PerfData string constant.
2723 // the -Djava.class.path and the -Dsun.java.command options are
2724 // omitted from jvm_args string as each have their own PerfData
2725 // string constant object.
2726 build_jvm_args(option->optionString);
2727 }
2728
2729 // -verbose:[class/gc/jni]
2730 if (match_option(option, "-verbose", &tail)) {
2731 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2732 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2733 return JNI_EINVAL;
2734 }
2735 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2736 return JNI_EINVAL;
2737 }
2738 } else if (!strcmp(tail, ":gc")) {
2739 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 } else if (!strcmp(tail, ":jni")) {
2743 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746 }
2747 // -da / -ea / -disableassertions / -enableassertions
2748 // These accept an optional class/package name separated by a colon, e.g.,
2749 // -da:java.lang.Thread.
2750 } else if (match_option(option, user_assertion_options, &tail, true)) {
2751 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2752 if (*tail == '\0') {
2753 JavaAssertions::setUserClassDefault(enable);
2754 } else {
2755 assert(*tail == ':', "bogus match by match_option()");
2756 JavaAssertions::addOption(tail + 1, enable);
2757 }
2758 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2759 } else if (match_option(option, system_assertion_options, &tail, false)) {
2760 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2761 JavaAssertions::setSystemClassDefault(enable);
2762 // -bootclasspath:
2763 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2764 scp_p->reset_path(tail);
2765 *scp_assembly_required_p = true;
2766 // -bootclasspath/a:
2767 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2768 scp_p->add_suffix(tail);
2769 *scp_assembly_required_p = true;
2770 // -bootclasspath/p:
2771 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2772 scp_p->add_prefix(tail);
2773 *scp_assembly_required_p = true;
2774 // -Xrun
2775 } else if (match_option(option, "-Xrun", &tail)) {
2776 if (tail != NULL) {
2777 const char* pos = strchr(tail, ':');
2778 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2779 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2780 name[len] = '\0';
2781
2782 char *options = NULL;
2783 if(pos != NULL) {
2784 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2785 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2786 }
2787 #if !INCLUDE_JVMTI
2788 if (strcmp(name, "jdwp") == 0) {
2789 jio_fprintf(defaultStream::error_stream(),
2790 "Debugging agents are not supported in this VM\n");
2791 return JNI_ERR;
2792 }
2793 #endif // !INCLUDE_JVMTI
2794 add_init_library(name, options);
2795 }
2796 // -agentlib and -agentpath
2797 } else if (match_option(option, "-agentlib:", &tail) ||
2798 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2799 if(tail != NULL) {
2800 const char* pos = strchr(tail, '=');
2801 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2802 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2803 name[len] = '\0';
2804
2805 char *options = NULL;
2806 if(pos != NULL) {
2807 options = os::strdup_check_oom(pos + 1, mtInternal);
2808 }
2809 #if !INCLUDE_JVMTI
2810 if (valid_jdwp_agent(name, is_absolute_path)) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "Debugging agents are not supported in this VM\n");
2813 return JNI_ERR;
2814 }
2815 #endif // !INCLUDE_JVMTI
2816 add_init_agent(name, options, is_absolute_path);
2817 }
2818 // -javaagent
2819 } else if (match_option(option, "-javaagent:", &tail)) {
2820 #if !INCLUDE_JVMTI
2821 jio_fprintf(defaultStream::error_stream(),
2822 "Instrumentation agents are not supported in this VM\n");
2823 return JNI_ERR;
2824 #else
2825 if(tail != NULL) {
2826 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2827 add_init_agent("instrument", options, false);
2828 }
2829 #endif // !INCLUDE_JVMTI
2830 // -Xnoclassgc
2831 } else if (match_option(option, "-Xnoclassgc")) {
2832 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2833 return JNI_EINVAL;
2834 }
2835 // -Xconcgc
2836 } else if (match_option(option, "-Xconcgc")) {
2837 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2838 return JNI_EINVAL;
2839 }
2840 // -Xnoconcgc
2841 } else if (match_option(option, "-Xnoconcgc")) {
2842 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2843 return JNI_EINVAL;
2844 }
2845 // -Xbatch
2846 } else if (match_option(option, "-Xbatch")) {
2847 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2848 return JNI_EINVAL;
2849 }
2850 // -Xmn for compatibility with other JVM vendors
2851 } else if (match_option(option, "-Xmn", &tail)) {
2852 julong long_initial_young_size = 0;
2853 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2854 if (errcode != arg_in_range) {
2855 jio_fprintf(defaultStream::error_stream(),
2856 "Invalid initial young generation size: %s\n", option->optionString);
2857 describe_range_error(errcode);
2858 return JNI_EINVAL;
2859 }
2860 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2861 return JNI_EINVAL;
2862 }
2863 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 // -Xms
2867 } else if (match_option(option, "-Xms", &tail)) {
2868 julong long_initial_heap_size = 0;
2869 // an initial heap size of 0 means automatically determine
2870 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2871 if (errcode != arg_in_range) {
2872 jio_fprintf(defaultStream::error_stream(),
2873 "Invalid initial heap size: %s\n", option->optionString);
2874 describe_range_error(errcode);
2875 return JNI_EINVAL;
2876 }
2877 set_min_heap_size((size_t)long_initial_heap_size);
2878 // Currently the minimum size and the initial heap sizes are the same.
2879 // Can be overridden with -XX:InitialHeapSize.
2880 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2881 return JNI_EINVAL;
2882 }
2883 // -Xmx
2884 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2885 julong long_max_heap_size = 0;
2886 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2887 if (errcode != arg_in_range) {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Invalid maximum heap size: %s\n", option->optionString);
2890 describe_range_error(errcode);
2891 return JNI_EINVAL;
2892 }
2893 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 // Xmaxf
2897 } else if (match_option(option, "-Xmaxf", &tail)) {
2898 char* err;
2899 int maxf = (int)(strtod(tail, &err) * 100);
2900 if (*err != '\0' || *tail == '\0') {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Bad max heap free percentage size: %s\n",
2903 option->optionString);
2904 return JNI_EINVAL;
2905 } else {
2906 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2907 return JNI_EINVAL;
2908 }
2909 }
2910 // Xminf
2911 } else if (match_option(option, "-Xminf", &tail)) {
2912 char* err;
2913 int minf = (int)(strtod(tail, &err) * 100);
2914 if (*err != '\0' || *tail == '\0') {
2915 jio_fprintf(defaultStream::error_stream(),
2916 "Bad min heap free percentage size: %s\n",
2917 option->optionString);
2918 return JNI_EINVAL;
2919 } else {
2920 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2921 return JNI_EINVAL;
2922 }
2923 }
2924 // -Xss
2925 } else if (match_option(option, "-Xss", &tail)) {
2926 julong long_ThreadStackSize = 0;
2927 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2928 if (errcode != arg_in_range) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Invalid thread stack size: %s\n", option->optionString);
2931 describe_range_error(errcode);
2932 return JNI_EINVAL;
2933 }
2934 // Internally track ThreadStackSize in units of 1024 bytes.
2935 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2936 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2940 } else if (match_option(option, "-Xoss", &tail) ||
2941 match_option(option, "-Xsqnopause") ||
2942 match_option(option, "-Xoptimize") ||
2943 match_option(option, "-Xboundthreads")) {
2944 // All these options are deprecated in JDK 9 and will be removed in a future release
2945 char version[256];
2946 JDK_Version::jdk(9).to_string(version, sizeof(version));
2947 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2948 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2949 julong long_CodeCacheExpansionSize = 0;
2950 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2951 if (errcode != arg_in_range) {
2952 jio_fprintf(defaultStream::error_stream(),
2953 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2954 os::vm_page_size()/K);
2955 return JNI_EINVAL;
2956 }
2957 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2958 return JNI_EINVAL;
2959 }
2960 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2961 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2962 julong long_ReservedCodeCacheSize = 0;
2963
2964 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2965 if (errcode != arg_in_range) {
2966 jio_fprintf(defaultStream::error_stream(),
2967 "Invalid maximum code cache size: %s.\n", option->optionString);
2968 return JNI_EINVAL;
2969 }
2970 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2971 return JNI_EINVAL;
2972 }
2973 // -XX:NonNMethodCodeHeapSize=
2974 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2975 julong long_NonNMethodCodeHeapSize = 0;
2976
2977 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2978 if (errcode != arg_in_range) {
2979 jio_fprintf(defaultStream::error_stream(),
2980 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2981 return JNI_EINVAL;
2982 }
2983 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 // -XX:ProfiledCodeHeapSize=
2987 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2988 julong long_ProfiledCodeHeapSize = 0;
2989
2990 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2991 if (errcode != arg_in_range) {
2992 jio_fprintf(defaultStream::error_stream(),
2993 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2994 return JNI_EINVAL;
2995 }
2996 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2997 return JNI_EINVAL;
2998 }
2999 // -XX:NonProfiledCodeHeapSizee=
3000 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3001 julong long_NonProfiledCodeHeapSize = 0;
3002
3003 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3004 if (errcode != arg_in_range) {
3005 jio_fprintf(defaultStream::error_stream(),
3006 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3007 return JNI_EINVAL;
3008 }
3009 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3010 return JNI_EINVAL;
3011 }
3012 // -green
3013 } else if (match_option(option, "-green")) {
3014 jio_fprintf(defaultStream::error_stream(),
3015 "Green threads support not available\n");
3016 return JNI_EINVAL;
3017 // -native
3018 } else if (match_option(option, "-native")) {
3019 // HotSpot always uses native threads, ignore silently for compatibility
3020 // -Xrs
3021 } else if (match_option(option, "-Xrs")) {
3022 // Classic/EVM option, new functionality
3023 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3024 return JNI_EINVAL;
3025 }
3026 } else if (match_option(option, "-Xusealtsigs")) {
3027 // change default internal VM signals used - lower case for back compat
3028 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
3029 return JNI_EINVAL;
3030 }
3031 // -Xprof
3032 } else if (match_option(option, "-Xprof")) {
3033 #if INCLUDE_FPROF
3034 _has_profile = true;
3035 #else // INCLUDE_FPROF
3036 jio_fprintf(defaultStream::error_stream(),
3037 "Flat profiling is not supported in this VM.\n");
3038 return JNI_ERR;
3039 #endif // INCLUDE_FPROF
3040 // -Xconcurrentio
3041 } else if (match_option(option, "-Xconcurrentio")) {
3042 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3043 return JNI_EINVAL;
3044 }
3045 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3049 return JNI_EINVAL;
3050 }
3051 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3052 return JNI_EINVAL;
3053 }
3054 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3055 return JNI_EINVAL;
3056 }
3057
3058 // -Xinternalversion
3059 } else if (match_option(option, "-Xinternalversion")) {
3060 jio_fprintf(defaultStream::output_stream(), "%s\n",
3061 VM_Version::internal_vm_info_string());
3062 vm_exit(0);
3063 #ifndef PRODUCT
3064 // -Xprintflags
3065 } else if (match_option(option, "-Xprintflags")) {
3066 CommandLineFlags::printFlags(tty, false);
3067 vm_exit(0);
3068 #endif
3069 // -D
3070 } else if (match_option(option, "-D", &tail)) {
3071 const char* value;
3072 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3073 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3074 // abort if -Djava.endorsed.dirs is set
3075 jio_fprintf(defaultStream::output_stream(),
3076 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3077 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3078 return JNI_EINVAL;
3079 }
3080 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3081 *value != '\0' && strcmp(value, "\"\"") != 0) {
3082 // abort if -Djava.ext.dirs is set
3083 jio_fprintf(defaultStream::output_stream(),
3084 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3085 return JNI_EINVAL;
3086 }
3087
3088 if (!add_property(tail)) {
3089 return JNI_ENOMEM;
3090 }
3091 // Out of the box management support
3092 if (match_option(option, "-Dcom.sun.management", &tail)) {
3093 #if INCLUDE_MANAGEMENT
3094 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3095 return JNI_EINVAL;
3096 }
3097 #else
3098 jio_fprintf(defaultStream::output_stream(),
3099 "-Dcom.sun.management is not supported in this VM.\n");
3100 return JNI_ERR;
3101 #endif
3102 }
3103 // -Xint
3104 } else if (match_option(option, "-Xint")) {
3105 set_mode_flags(_int);
3106 // -Xmixed
3107 } else if (match_option(option, "-Xmixed")) {
3108 set_mode_flags(_mixed);
3109 // -Xcomp
3110 } else if (match_option(option, "-Xcomp")) {
3111 // for testing the compiler; turn off all flags that inhibit compilation
3112 set_mode_flags(_comp);
3113 // -Xshare:dump
3114 } else if (match_option(option, "-Xshare:dump")) {
3115 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3116 return JNI_EINVAL;
3117 }
3118 set_mode_flags(_int); // Prevent compilation, which creates objects
3119 // -Xshare:on
3120 } else if (match_option(option, "-Xshare:on")) {
3121 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 // -Xshare:auto
3128 } else if (match_option(option, "-Xshare:auto")) {
3129 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3130 return JNI_EINVAL;
3131 }
3132 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3133 return JNI_EINVAL;
3134 }
3135 // -Xshare:off
3136 } else if (match_option(option, "-Xshare:off")) {
3137 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3138 return JNI_EINVAL;
3139 }
3140 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3141 return JNI_EINVAL;
3142 }
3143 // -Xverify
3144 } else if (match_option(option, "-Xverify", &tail)) {
3145 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3146 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 } else if (strcmp(tail, ":remote") == 0) {
3153 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3154 return JNI_EINVAL;
3155 }
3156 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3157 return JNI_EINVAL;
3158 }
3159 } else if (strcmp(tail, ":none") == 0) {
3160 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3161 return JNI_EINVAL;
3162 }
3163 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3164 return JNI_EINVAL;
3165 }
3166 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3167 return JNI_EINVAL;
3168 }
3169 // -Xdebug
3170 } else if (match_option(option, "-Xdebug")) {
3171 // note this flag has been used, then ignore
3172 set_xdebug_mode(true);
3173 // -Xnoagent
3174 } else if (match_option(option, "-Xnoagent")) {
3175 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3176 } else if (match_option(option, "-Xloggc:", &tail)) {
3177 // Redirect GC output to the file. -Xloggc:<filename>
3178 // ostream_init_log(), when called will use this filename
3179 // to initialize a fileStream.
3180 _gc_log_filename = os::strdup_check_oom(tail);
3181 if (!is_filename_valid(_gc_log_filename)) {
3182 jio_fprintf(defaultStream::output_stream(),
3183 "Invalid file name for use with -Xloggc: Filename can only contain the "
3184 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3185 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3186 return JNI_EINVAL;
3187 }
3188 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
3189 return JNI_EINVAL;
3190 }
3191 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 // JNI hooks
3195 } else if (match_option(option, "-Xcheck", &tail)) {
3196 if (!strcmp(tail, ":jni")) {
3197 #if !INCLUDE_JNI_CHECK
3198 warning("JNI CHECKING is not supported in this VM");
3199 #else
3200 CheckJNICalls = true;
3201 #endif // INCLUDE_JNI_CHECK
3202 } else if (is_bad_option(option, args->ignoreUnrecognized,
3203 "check")) {
3204 return JNI_EINVAL;
3205 }
3206 } else if (match_option(option, "vfprintf")) {
3207 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3208 } else if (match_option(option, "exit")) {
3209 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3210 } else if (match_option(option, "abort")) {
3211 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3212 // -XX:+AggressiveHeap
3213 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3214 jint result = set_aggressive_heap_flags();
3215 if (result != JNI_OK) {
3216 return result;
3217 }
3218 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3219 // and the last option wins.
3220 } else if (match_option(option, "-XX:+NeverTenure")) {
3221 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3222 return JNI_EINVAL;
3223 }
3224 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3225 return JNI_EINVAL;
3226 }
3227 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3228 return JNI_EINVAL;
3229 }
3230 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3231 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3232 return JNI_EINVAL;
3233 }
3234 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3235 return JNI_EINVAL;
3236 }
3237 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3238 return JNI_EINVAL;
3239 }
3240 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3241 uintx max_tenuring_thresh = 0;
3242 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3243 jio_fprintf(defaultStream::error_stream(),
3244 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3245 return JNI_EINVAL;
3246 }
3247
3248 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3249 return JNI_EINVAL;
3250 }
3251
3252 if (MaxTenuringThreshold == 0) {
3253 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3254 return JNI_EINVAL;
3255 }
3256 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3257 return JNI_EINVAL;
3258 }
3259 } else {
3260 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3261 return JNI_EINVAL;
3262 }
3263 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3264 return JNI_EINVAL;
3265 }
3266 }
3267 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3268 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3269 return JNI_EINVAL;
3270 }
3271 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3272 return JNI_EINVAL;
3273 }
3274 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3275 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3276 return JNI_EINVAL;
3277 }
3278 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3279 return JNI_EINVAL;
3280 }
3281 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3282 #if defined(DTRACE_ENABLED)
3283 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3284 return JNI_EINVAL;
3285 }
3286 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3287 return JNI_EINVAL;
3288 }
3289 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3293 return JNI_EINVAL;
3294 }
3295 #else // defined(DTRACE_ENABLED)
3296 jio_fprintf(defaultStream::error_stream(),
3297 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3298 return JNI_EINVAL;
3299 #endif // defined(DTRACE_ENABLED)
3300 #ifdef ASSERT
3301 } else if (match_option(option, "-XX:+FullGCALot")) {
3302 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3303 return JNI_EINVAL;
3304 }
3305 // disable scavenge before parallel mark-compact
3306 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3307 return JNI_EINVAL;
3308 }
3309 #endif
3310 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3311 julong max_direct_memory_size = 0;
3312 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3313 if (errcode != arg_in_range) {
3314 jio_fprintf(defaultStream::error_stream(),
3315 "Invalid maximum direct memory size: %s\n",
3316 option->optionString);
3317 describe_range_error(errcode);
3318 return JNI_EINVAL;
3319 }
3320 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3321 return JNI_EINVAL;
3322 }
3323 #if !INCLUDE_MANAGEMENT
3324 } else if (match_option(option, "-XX:+ManagementServer")) {
3325 jio_fprintf(defaultStream::error_stream(),
3326 "ManagementServer is not supported in this VM.\n");
3327 return JNI_ERR;
3328 #endif // INCLUDE_MANAGEMENT
3329 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3330 // Skip -XX:Flags= since that case has already been handled
3331 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3332 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3333 return JNI_EINVAL;
3334 }
3335 }
3336 // Unknown option
3337 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3338 return JNI_ERR;
3339 }
3340 }
3341
3342 // PrintSharedArchiveAndExit will turn on
3343 // -Xshare:on
3344 // -XX:+TraceClassPaths
3345 if (PrintSharedArchiveAndExit) {
3346 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3347 return JNI_EINVAL;
3348 }
3349 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3350 return JNI_EINVAL;
3351 }
3352 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3353 return JNI_EINVAL;
3354 }
3355 }
3356
3357 // Change the default value for flags which have different default values
3358 // when working with older JDKs.
3359 #ifdef LINUX
3360 if (JDK_Version::current().compare_major(6) <= 0 &&
3361 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3362 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3363 }
3364 #endif // LINUX
3365 fix_appclasspath();
3366 return JNI_OK;
3367 }
3368
3369 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3370 //
3371 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3372 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3373 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3374 // path is treated as the current directory.
3375 //
3376 // This causes problems with CDS, which requires that all directories specified in the classpath
3377 // must be empty. In most cases, applications do NOT want to load classes from the current
3378 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3379 // scripts compatible with CDS.
3380 void Arguments::fix_appclasspath() {
3381 if (IgnoreEmptyClassPaths) {
3382 const char separator = *os::path_separator();
3383 const char* src = _java_class_path->value();
3384
3385 // skip over all the leading empty paths
3386 while (*src == separator) {
3387 src ++;
3388 }
3389
3390 char* copy = os::strdup_check_oom(src, mtInternal);
3391
3392 // trim all trailing empty paths
3393 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3394 *tail = '\0';
3395 }
3396
3397 char from[3] = {separator, separator, '\0'};
3398 char to [2] = {separator, '\0'};
3399 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3400 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3401 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3402 }
3403
3404 _java_class_path->set_value(copy);
3405 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3406 }
3407
3408 if (!PrintSharedArchiveAndExit) {
3409 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3410 }
3411 }
3412
3413 static bool has_jar_files(const char* directory) {
3414 DIR* dir = os::opendir(directory);
3415 if (dir == NULL) return false;
3416
3417 struct dirent *entry;
3418 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3419 bool hasJarFile = false;
3420 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3421 const char* name = entry->d_name;
3422 const char* ext = name + strlen(name) - 4;
3423 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3424 }
3425 FREE_C_HEAP_ARRAY(char, dbuf);
3426 os::closedir(dir);
3427 return hasJarFile ;
3428 }
3429
3430 static int check_non_empty_dirs(const char* path) {
3431 const char separator = *os::path_separator();
3432 const char* const end = path + strlen(path);
3433 int nonEmptyDirs = 0;
3434 while (path < end) {
3435 const char* tmp_end = strchr(path, separator);
3436 if (tmp_end == NULL) {
3437 if (has_jar_files(path)) {
3438 nonEmptyDirs++;
3439 jio_fprintf(defaultStream::output_stream(),
3440 "Non-empty directory: %s\n", path);
3441 }
3442 path = end;
3443 } else {
3444 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3445 memcpy(dirpath, path, tmp_end - path);
3446 dirpath[tmp_end - path] = '\0';
3447 if (has_jar_files(dirpath)) {
3448 nonEmptyDirs++;
3449 jio_fprintf(defaultStream::output_stream(),
3450 "Non-empty directory: %s\n", dirpath);
3451 }
3452 FREE_C_HEAP_ARRAY(char, dirpath);
3453 path = tmp_end + 1;
3454 }
3455 }
3456 return nonEmptyDirs;
3457 }
3458
3459 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3460 // check if the default lib/endorsed directory exists; if so, error
3461 char path[JVM_MAXPATHLEN];
3462 const char* fileSep = os::file_separator();
3463 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3464
3465 if (CheckEndorsedAndExtDirs) {
3466 int nonEmptyDirs = 0;
3467 // check endorsed directory
3468 nonEmptyDirs += check_non_empty_dirs(path);
3469 // check the extension directories
3470 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3471 if (nonEmptyDirs > 0) {
3472 return JNI_ERR;
3473 }
3474 }
3475
3476 DIR* dir = os::opendir(path);
3477 if (dir != NULL) {
3478 jio_fprintf(defaultStream::output_stream(),
3479 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3480 "in modular form will be supported via the concept of upgradeable modules.\n");
3481 os::closedir(dir);
3482 return JNI_ERR;
3483 }
3484
3485 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3486 dir = os::opendir(path);
3487 if (dir != NULL) {
3488 jio_fprintf(defaultStream::output_stream(),
3489 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3490 "Use -classpath instead.\n.");
3491 os::closedir(dir);
3492 return JNI_ERR;
3493 }
3494
3495 if (scp_assembly_required) {
3496 // Assemble the bootclasspath elements into the final path.
3497 char *combined_path = scp_p->combined_path();
3498 Arguments::set_sysclasspath(combined_path);
3499 FREE_C_HEAP_ARRAY(char, combined_path);
3500 }
3501
3502 // This must be done after all arguments have been processed.
3503 // java_compiler() true means set to "NONE" or empty.
3504 if (java_compiler() && !xdebug_mode()) {
3505 // For backwards compatibility, we switch to interpreted mode if
3506 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3507 // not specified.
3508 set_mode_flags(_int);
3509 }
3510
3511 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3512 // but like -Xint, leave compilation thresholds unaffected.
3513 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3514 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3515 set_mode_flags(_int);
3516 }
3517
3518 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3519 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3520 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3521 }
3522
3523 #ifndef COMPILER2
3524 // Don't degrade server performance for footprint
3525 if (FLAG_IS_DEFAULT(UseLargePages) &&
3526 MaxHeapSize < LargePageHeapSizeThreshold) {
3527 // No need for large granularity pages w/small heaps.
3528 // Note that large pages are enabled/disabled for both the
3529 // Java heap and the code cache.
3530 FLAG_SET_DEFAULT(UseLargePages, false);
3531 }
3532
3533 #else
3534 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3535 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3536 }
3537 #endif
3538
3539 #ifndef TIERED
3540 // Tiered compilation is undefined.
3541 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3542 #endif
3543
3544 // If we are running in a headless jre, force java.awt.headless property
3545 // to be true unless the property has already been set.
3546 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3547 if (os::is_headless_jre()) {
3548 const char* headless = Arguments::get_property("java.awt.headless");
3549 if (headless == NULL) {
3550 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3551 if (headless_env == NULL) {
3552 if (!add_property("java.awt.headless=true")) {
3553 return JNI_ENOMEM;
3554 }
3555 } else {
3556 char buffer[256];
3557 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3558 if (!add_property(buffer)) {
3559 return JNI_ENOMEM;
3560 }
3561 }
3562 }
3563 }
3564
3565 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3566 // CMS can only be used with ParNew
3567 FLAG_SET_ERGO(bool, UseParNewGC, true);
3568 }
3569
3570 if (!check_vm_args_consistency()) {
3571 return JNI_ERR;
3572 }
3573
3574 return JNI_OK;
3575 }
3576
3577 // Helper class for controlling the lifetime of JavaVMInitArgs
3578 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3579 // deleted on the destruction of the ScopedVMInitArgs object.
3580 class ScopedVMInitArgs : public StackObj {
3581 private:
3582 JavaVMInitArgs _args;
3583
3584 public:
3585 ScopedVMInitArgs() {
3586 _args.version = JNI_VERSION_1_2;
3587 _args.nOptions = 0;
3588 _args.options = NULL;
3589 _args.ignoreUnrecognized = false;
3590 }
3591
3592 // Populates the JavaVMInitArgs object represented by this
3593 // ScopedVMInitArgs object with the arguments in options. The
3594 // allocated memory is deleted by the destructor. If this method
3595 // returns anything other than JNI_OK, then this object is in a
3596 // partially constructed state, and should be abandoned.
3597 jint set_args(GrowableArray<JavaVMOption>* options) {
3598 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3599 JavaVMOption, options->length(), mtInternal);
3600 if (options_arr == NULL) {
3601 return JNI_ENOMEM;
3602 }
3603 _args.options = options_arr;
3604
3605 for (int i = 0; i < options->length(); i++) {
3606 options_arr[i] = options->at(i);
3607 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3608 if (options_arr[i].optionString == NULL) {
3609 // Rely on the destructor to do cleanup.
3610 _args.nOptions = i;
3611 return JNI_ENOMEM;
3612 }
3613 }
3614
3615 _args.nOptions = options->length();
3616 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3617 return JNI_OK;
3618 }
3619
3620 JavaVMInitArgs* get() { return &_args; }
3621
3622 ~ScopedVMInitArgs() {
3623 if (_args.options == NULL) return;
3624 for (int i = 0; i < _args.nOptions; i++) {
3625 os::free(_args.options[i].optionString);
3626 }
3627 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3628 }
3629 };
3630
3631 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3632 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3633 }
3634
3635 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3636 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3637 }
3638
3639 jint Arguments::parse_options_environment_variable(const char* name,
3640 ScopedVMInitArgs* vm_args) {
3641 char *buffer = ::getenv(name);
3642
3643 // Don't check this environment variable if user has special privileges
3644 // (e.g. unix su command).
3645 if (buffer == NULL || os::have_special_privileges()) {
3646 return JNI_OK;
3647 }
3648
3649 if ((buffer = os::strdup(buffer)) == NULL) {
3650 return JNI_ENOMEM;
3651 }
3652
3653 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3654 jio_fprintf(defaultStream::error_stream(),
3655 "Picked up %s: %s\n", name, buffer);
3656 char* rd = buffer; // pointer to the input string (rd)
3657 while (true) { // repeat for all options in the input string
3658 while (isspace(*rd)) rd++; // skip whitespace
3659 if (*rd == 0) break; // we re done when the input string is read completely
3660
3661 // The output, option string, overwrites the input string.
3662 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3663 // input string (rd).
3664 char* wrt = rd;
3665
3666 JavaVMOption option;
3667 option.optionString = wrt;
3668 options->append(option); // Fill in option
3669 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3670 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3671 int quote = *rd; // matching quote to look for
3672 rd++; // don't copy open quote
3673 while (*rd != quote) { // include everything (even spaces) up until quote
3674 if (*rd == 0) { // string termination means unmatched string
3675 jio_fprintf(defaultStream::error_stream(),
3676 "Unmatched quote in %s\n", name);
3677 delete options;
3678 os::free(buffer);
3679 return JNI_ERR;
3680 }
3681 *wrt++ = *rd++; // copy to option string
3682 }
3683 rd++; // don't copy close quote
3684 } else {
3685 *wrt++ = *rd++; // copy to option string
3686 }
3687 }
3688 if (*rd != 0) {
3689 // In this case, the assignment to wrt below will make *rd nul,
3690 // which will interfere with the next loop iteration.
3691 rd++;
3692 }
3693 *wrt = 0; // Zero terminate option
3694 }
3695
3696 // Fill out JavaVMInitArgs structure.
3697 jint status = vm_args->set_args(options);
3698
3699 delete options;
3700 os::free(buffer);
3701 return status;
3702 }
3703
3704 void Arguments::set_shared_spaces_flags() {
3705 if (DumpSharedSpaces) {
3706 if (RequireSharedSpaces) {
3707 warning("Cannot dump shared archive while using shared archive");
3708 }
3709 UseSharedSpaces = false;
3710 #ifdef _LP64
3711 if (!UseCompressedOops || !UseCompressedClassPointers) {
3712 vm_exit_during_initialization(
3713 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3714 }
3715 } else {
3716 if (!UseCompressedOops || !UseCompressedClassPointers) {
3717 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3718 }
3719 #endif
3720 }
3721 }
3722
3723 #if !INCLUDE_ALL_GCS
3724 static void force_serial_gc() {
3725 FLAG_SET_DEFAULT(UseSerialGC, true);
3726 UNSUPPORTED_GC_OPTION(UseG1GC);
3727 UNSUPPORTED_GC_OPTION(UseParallelGC);
3728 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3729 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3730 UNSUPPORTED_GC_OPTION(UseParNewGC);
3731 }
3732 #endif // INCLUDE_ALL_GCS
3733
3734 // Sharing support
3735 // Construct the path to the archive
3736 static char* get_shared_archive_path() {
3737 char *shared_archive_path;
3738 if (SharedArchiveFile == NULL) {
3739 char jvm_path[JVM_MAXPATHLEN];
3740 os::jvm_path(jvm_path, sizeof(jvm_path));
3741 char *end = strrchr(jvm_path, *os::file_separator());
3742 if (end != NULL) *end = '\0';
3743 size_t jvm_path_len = strlen(jvm_path);
3744 size_t file_sep_len = strlen(os::file_separator());
3745 const size_t len = jvm_path_len + file_sep_len + 20;
3746 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3747 if (shared_archive_path != NULL) {
3748 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3749 jvm_path, os::file_separator());
3750 }
3751 } else {
3752 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3753 }
3754 return shared_archive_path;
3755 }
3756
3757 #ifndef PRODUCT
3758 // Determine whether LogVMOutput should be implicitly turned on.
3759 static bool use_vm_log() {
3760 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3761 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3762 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3763 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3764 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3765 return true;
3766 }
3767
3768 #ifdef COMPILER1
3769 if (PrintC1Statistics) {
3770 return true;
3771 }
3772 #endif // COMPILER1
3773
3774 #ifdef COMPILER2
3775 if (PrintOptoAssembly || PrintOptoStatistics) {
3776 return true;
3777 }
3778 #endif // COMPILER2
3779
3780 return false;
3781 }
3782 #endif // PRODUCT
3783
3784 static jint match_special_option_and_act(const JavaVMInitArgs* args,
3785 char** flags_file) {
3786 // Remaining part of option string
3787 const char* tail;
3788
3789 for (int index = 0; index < args->nOptions; index++) {
3790 const JavaVMOption* option = args->options + index;
3791 if (ArgumentsExt::process_options(option)) {
3792 continue;
3793 }
3794 if (match_option(option, "-XX:Flags=", &tail)) {
3795 *flags_file = (char *) tail;
3796 continue;
3797 }
3798 if (match_option(option, "-XX:+PrintVMOptions")) {
3799 PrintVMOptions = true;
3800 continue;
3801 }
3802 if (match_option(option, "-XX:-PrintVMOptions")) {
3803 PrintVMOptions = false;
3804 continue;
3805 }
3806 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3807 IgnoreUnrecognizedVMOptions = true;
3808 continue;
3809 }
3810 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3811 IgnoreUnrecognizedVMOptions = false;
3812 continue;
3813 }
3814 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3815 CommandLineFlags::printFlags(tty, false);
3816 vm_exit(0);
3817 }
3818 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3819 #if INCLUDE_NMT
3820 // The launcher did not setup nmt environment variable properly.
3821 if (!MemTracker::check_launcher_nmt_support(tail)) {
3822 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3823 }
3824
3825 // Verify if nmt option is valid.
3826 if (MemTracker::verify_nmt_option()) {
3827 // Late initialization, still in single-threaded mode.
3828 if (MemTracker::tracking_level() >= NMT_summary) {
3829 MemTracker::init();
3830 }
3831 } else {
3832 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3833 }
3834 continue;
3835 #else
3836 jio_fprintf(defaultStream::error_stream(),
3837 "Native Memory Tracking is not supported in this VM\n");
3838 return JNI_ERR;
3839 #endif
3840 }
3841
3842 #ifndef PRODUCT
3843 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3844 CommandLineFlags::printFlags(tty, true);
3845 vm_exit(0);
3846 }
3847 #endif
3848 }
3849 return JNI_OK;
3850 }
3851
3852 static void print_options(const JavaVMInitArgs *args) {
3853 const char* tail;
3854 for (int index = 0; index < args->nOptions; index++) {
3855 const JavaVMOption *option = args->options + index;
3856 if (match_option(option, "-XX:", &tail)) {
3857 logOption(tail);
3858 }
3859 }
3860 }
3861
3862 // Parse entry point called from JNI_CreateJavaVM
3863
3864 jint Arguments::parse(const JavaVMInitArgs* args) {
3865 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3866
3867 // Initialize ranges and constraints
3868 CommandLineFlagRangeList::init();
3869 CommandLineFlagConstraintList::init();
3870
3871 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3872 const char* hotspotrc = ".hotspotrc";
3873 char* flags_file = NULL;
3874 bool settings_file_specified = false;
3875 bool needs_hotspotrc_warning = false;
3876 ScopedVMInitArgs java_tool_options_args;
3877 ScopedVMInitArgs java_options_args;
3878
3879 jint code =
3880 parse_java_tool_options_environment_variable(&java_tool_options_args);
3881 if (code != JNI_OK) {
3882 return code;
3883 }
3884
3885 code = parse_java_options_environment_variable(&java_options_args);
3886 if (code != JNI_OK) {
3887 return code;
3888 }
3889
3890 code =
3891 match_special_option_and_act(java_tool_options_args.get(), &flags_file);
3892 if (code != JNI_OK) {
3893 return code;
3894 }
3895
3896 code = match_special_option_and_act(args, &flags_file);
3897 if (code != JNI_OK) {
3898 return code;
3899 }
3900
3901 code = match_special_option_and_act(java_options_args.get(), &flags_file);
3902 if (code != JNI_OK) {
3903 return code;
3904 }
3905
3906 settings_file_specified = (flags_file != NULL);
3907
3908 if (IgnoreUnrecognizedVMOptions) {
3909 // uncast const to modify the flag args->ignoreUnrecognized
3910 *(jboolean*)(&args->ignoreUnrecognized) = true;
3911 java_tool_options_args.get()->ignoreUnrecognized = true;
3912 java_options_args.get()->ignoreUnrecognized = true;
3913 }
3914
3915 // Parse specified settings file
3916 if (settings_file_specified) {
3917 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3918 return JNI_EINVAL;
3919 }
3920 } else {
3921 #ifdef ASSERT
3922 // Parse default .hotspotrc settings file
3923 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3924 return JNI_EINVAL;
3925 }
3926 #else
3927 struct stat buf;
3928 if (os::stat(hotspotrc, &buf) == 0) {
3929 needs_hotspotrc_warning = true;
3930 }
3931 #endif
3932 }
3933
3934 if (PrintVMOptions) {
3935 print_options(java_tool_options_args.get());
3936 print_options(args);
3937 print_options(java_options_args.get());
3938 }
3939
3940 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3941 jint result = parse_vm_init_args(java_tool_options_args.get(),
3942 java_options_args.get(), args);
3943
3944 if (result != JNI_OK) {
3945 return result;
3946 }
3947
3948 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3949 SharedArchivePath = get_shared_archive_path();
3950 if (SharedArchivePath == NULL) {
3951 return JNI_ENOMEM;
3952 }
3953
3954 // Set up VerifySharedSpaces
3955 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3956 VerifySharedSpaces = true;
3957 }
3958
3959 // Delay warning until here so that we've had a chance to process
3960 // the -XX:-PrintWarnings flag
3961 if (needs_hotspotrc_warning) {
3962 warning("%s file is present but has been ignored. "
3963 "Run with -XX:Flags=%s to load the file.",
3964 hotspotrc, hotspotrc);
3965 }
3966
3967 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3968 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3969 #endif
3970
3971 ArgumentsExt::report_unsupported_options();
3972
3973 #ifndef PRODUCT
3974 if (TraceBytecodesAt != 0) {
3975 TraceBytecodes = true;
3976 }
3977 if (CountCompiledCalls) {
3978 if (UseCounterDecay) {
3979 warning("UseCounterDecay disabled because CountCalls is set");
3980 UseCounterDecay = false;
3981 }
3982 }
3983 #endif // PRODUCT
3984
3985 if (ScavengeRootsInCode == 0) {
3986 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3987 warning("Forcing ScavengeRootsInCode non-zero");
3988 }
3989 ScavengeRootsInCode = 1;
3990 }
3991
3992 if (PrintGCDetails) {
3993 // Turn on -verbose:gc options as well
3994 PrintGC = true;
3995 }
3996
3997 // Set object alignment values.
3998 set_object_alignment();
3999
4000 #if !INCLUDE_ALL_GCS
4001 force_serial_gc();
4002 #endif // INCLUDE_ALL_GCS
4003 #if !INCLUDE_CDS
4004 if (DumpSharedSpaces || RequireSharedSpaces) {
4005 jio_fprintf(defaultStream::error_stream(),
4006 "Shared spaces are not supported in this VM\n");
4007 return JNI_ERR;
4008 }
4009 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4010 warning("Shared spaces are not supported in this VM");
4011 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4012 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4013 }
4014 no_shared_spaces("CDS Disabled");
4015 #endif // INCLUDE_CDS
4016
4017 return JNI_OK;
4018 }
4019
4020 jint Arguments::apply_ergo() {
4021
4022 // Set flags based on ergonomics.
4023 set_ergonomics_flags();
4024
4025 set_shared_spaces_flags();
4026
4027 // Check the GC selections again.
4028 if (!check_gc_consistency()) {
4029 return JNI_EINVAL;
4030 }
4031
4032 if (TieredCompilation) {
4033 set_tiered_flags();
4034 } else {
4035 int max_compilation_policy_choice = 1;
4036 #ifdef COMPILER2
4037 max_compilation_policy_choice = 2;
4038 #endif
4039 // Check if the policy is valid.
4040 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4041 vm_exit_during_initialization(
4042 "Incompatible compilation policy selected", NULL);
4043 }
4044 // Scale CompileThreshold
4045 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4046 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4047 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4048 }
4049 }
4050
4051 #ifdef COMPILER2
4052 #ifndef PRODUCT
4053 if (PrintIdealGraphLevel > 0) {
4054 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4055 }
4056 #endif
4057 #endif
4058
4059 // Set heap size based on available physical memory
4060 set_heap_size();
4061
4062 ArgumentsExt::set_gc_specific_flags();
4063
4064 // Initialize Metaspace flags and alignments
4065 Metaspace::ergo_initialize();
4066
4067 // Set bytecode rewriting flags
4068 set_bytecode_flags();
4069
4070 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4071 set_aggressive_opts_flags();
4072
4073 // Turn off biased locking for locking debug mode flags,
4074 // which are subtly different from each other but neither works with
4075 // biased locking
4076 if (UseHeavyMonitors
4077 #ifdef COMPILER1
4078 || !UseFastLocking
4079 #endif // COMPILER1
4080 ) {
4081 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4082 // flag set to true on command line; warn the user that they
4083 // can't enable biased locking here
4084 warning("Biased Locking is not supported with locking debug flags"
4085 "; ignoring UseBiasedLocking flag." );
4086 }
4087 UseBiasedLocking = false;
4088 }
4089
4090 #ifdef ZERO
4091 // Clear flags not supported on zero.
4092 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4093 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4094 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4095 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4096 #endif // CC_INTERP
4097
4098 #ifdef COMPILER2
4099 if (!EliminateLocks) {
4100 EliminateNestedLocks = false;
4101 }
4102 if (!Inline) {
4103 IncrementalInline = false;
4104 }
4105 #ifndef PRODUCT
4106 if (!IncrementalInline) {
4107 AlwaysIncrementalInline = false;
4108 }
4109 #endif
4110 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4111 // nothing to use the profiling, turn if off
4112 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4113 }
4114 #endif
4115
4116 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4117 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4118 DebugNonSafepoints = true;
4119 }
4120
4121 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4122 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4123 }
4124
4125 #ifndef PRODUCT
4126 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4127 if (use_vm_log()) {
4128 LogVMOutput = true;
4129 }
4130 }
4131 #endif // PRODUCT
4132
4133 if (PrintCommandLineFlags) {
4134 CommandLineFlags::printSetFlags(tty);
4135 }
4136
4137 // Apply CPU specific policy for the BiasedLocking
4138 if (UseBiasedLocking) {
4139 if (!VM_Version::use_biased_locking() &&
4140 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4141 UseBiasedLocking = false;
4142 }
4143 }
4144 #ifdef COMPILER2
4145 if (!UseBiasedLocking || EmitSync != 0) {
4146 UseOptoBiasInlining = false;
4147 }
4148 #endif
4149
4150 return JNI_OK;
4151 }
4152
4153 jint Arguments::adjust_after_os() {
4154 if (UseNUMA) {
4155 if (UseParallelGC || UseParallelOldGC) {
4156 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4157 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4158 }
4159 }
4160 // UseNUMAInterleaving is set to ON for all collectors and
4161 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4162 // such as the parallel collector for Linux and Solaris will
4163 // interleave old gen and survivor spaces on top of NUMA
4164 // allocation policy for the eden space.
4165 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4166 // all platforms and ParallelGC on Windows will interleave all
4167 // of the heap spaces across NUMA nodes.
4168 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4169 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4170 }
4171 }
4172 return JNI_OK;
4173 }
4174
4175 int Arguments::PropertyList_count(SystemProperty* pl) {
4176 int count = 0;
4177 while(pl != NULL) {
4178 count++;
4179 pl = pl->next();
4180 }
4181 return count;
4182 }
4183
4184 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4185 assert(key != NULL, "just checking");
4186 SystemProperty* prop;
4187 for (prop = pl; prop != NULL; prop = prop->next()) {
4188 if (strcmp(key, prop->key()) == 0) return prop->value();
4189 }
4190 return NULL;
4191 }
4192
4193 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4194 int count = 0;
4195 const char* ret_val = NULL;
4196
4197 while(pl != NULL) {
4198 if(count >= index) {
4199 ret_val = pl->key();
4200 break;
4201 }
4202 count++;
4203 pl = pl->next();
4204 }
4205
4206 return ret_val;
4207 }
4208
4209 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4210 int count = 0;
4211 char* ret_val = NULL;
4212
4213 while(pl != NULL) {
4214 if(count >= index) {
4215 ret_val = pl->value();
4216 break;
4217 }
4218 count++;
4219 pl = pl->next();
4220 }
4221
4222 return ret_val;
4223 }
4224
4225 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4226 SystemProperty* p = *plist;
4227 if (p == NULL) {
4228 *plist = new_p;
4229 } else {
4230 while (p->next() != NULL) {
4231 p = p->next();
4232 }
4233 p->set_next(new_p);
4234 }
4235 }
4236
4237 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4238 if (plist == NULL)
4239 return;
4240
4241 SystemProperty* new_p = new SystemProperty(k, v, true);
4242 PropertyList_add(plist, new_p);
4243 }
4244
4245 void Arguments::PropertyList_add(SystemProperty *element) {
4246 PropertyList_add(&_system_properties, element);
4247 }
4248
4249 // This add maintains unique property key in the list.
4250 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4251 if (plist == NULL)
4252 return;
4253
4254 // If property key exist then update with new value.
4255 SystemProperty* prop;
4256 for (prop = *plist; prop != NULL; prop = prop->next()) {
4257 if (strcmp(k, prop->key()) == 0) {
4258 if (append) {
4259 prop->append_value(v);
4260 } else {
4261 prop->set_value(v);
4262 }
4263 return;
4264 }
4265 }
4266
4267 PropertyList_add(plist, k, v);
4268 }
4269
4270 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4271 // Returns true if all of the source pointed by src has been copied over to
4272 // the destination buffer pointed by buf. Otherwise, returns false.
4273 // Notes:
4274 // 1. If the length (buflen) of the destination buffer excluding the
4275 // NULL terminator character is not long enough for holding the expanded
4276 // pid characters, it also returns false instead of returning the partially
4277 // expanded one.
4278 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4279 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4280 char* buf, size_t buflen) {
4281 const char* p = src;
4282 char* b = buf;
4283 const char* src_end = &src[srclen];
4284 char* buf_end = &buf[buflen - 1];
4285
4286 while (p < src_end && b < buf_end) {
4287 if (*p == '%') {
4288 switch (*(++p)) {
4289 case '%': // "%%" ==> "%"
4290 *b++ = *p++;
4291 break;
4292 case 'p': { // "%p" ==> current process id
4293 // buf_end points to the character before the last character so
4294 // that we could write '\0' to the end of the buffer.
4295 size_t buf_sz = buf_end - b + 1;
4296 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4297
4298 // if jio_snprintf fails or the buffer is not long enough to hold
4299 // the expanded pid, returns false.
4300 if (ret < 0 || ret >= (int)buf_sz) {
4301 return false;
4302 } else {
4303 b += ret;
4304 assert(*b == '\0', "fail in copy_expand_pid");
4305 if (p == src_end && b == buf_end + 1) {
4306 // reach the end of the buffer.
4307 return true;
4308 }
4309 }
4310 p++;
4311 break;
4312 }
4313 default :
4314 *b++ = '%';
4315 }
4316 } else {
4317 *b++ = *p++;
4318 }
4319 }
4320 *b = '\0';
4321 return (p == src_end); // return false if not all of the source was copied
4322 }