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 "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/arguments_ext.hpp"
41 #include "runtime/commandLineFlagConstraintList.hpp"
42 #include "runtime/commandLineFlagRangeList.hpp"
43 #include "runtime/globals.hpp"
44 #include "runtime/globals_extension.hpp"
45 #include "runtime/java.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/vm_version.hpp"
48 #include "services/management.hpp"
49 #include "services/memTracker.hpp"
50 #include "utilities/defaultStream.hpp"
51 #include "utilities/macros.hpp"
52 #include "utilities/stringUtils.hpp"
53 #if INCLUDE_JVMCI
54 #include "jvmci/jvmciRuntime.hpp"
55 #endif
56 #if INCLUDE_ALL_GCS
57 #include "gc/cms/compactibleFreeListSpace.hpp"
58 #include "gc/g1/g1CollectedHeap.inline.hpp"
59 #include "gc/parallel/parallelScavengeHeap.hpp"
60 #endif // INCLUDE_ALL_GCS
61
62 // Note: This is a special bug reporting site for the JVM
63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
64 #define DEFAULT_JAVA_LAUNCHER "generic"
65
66 #define UNSUPPORTED_GC_OPTION(gc) \
67 do { \
68 if (gc) { \
69 if (FLAG_IS_CMDLINE(gc)) { \
70 warning(#gc " is not supported in this VM. Using Serial GC."); \
71 } \
72 FLAG_SET_DEFAULT(gc, false); \
73 } \
74 } while(0)
75
76 char** Arguments::_jvm_flags_array = NULL;
77 int Arguments::_num_jvm_flags = 0;
78 char** Arguments::_jvm_args_array = NULL;
79 int Arguments::_num_jvm_args = 0;
80 char* Arguments::_java_command = NULL;
81 SystemProperty* Arguments::_system_properties = NULL;
82 const char* Arguments::_gc_log_filename = NULL;
83 bool Arguments::_has_profile = false;
84 size_t Arguments::_conservative_max_heap_alignment = 0;
85 size_t Arguments::_min_heap_size = 0;
86 Arguments::Mode Arguments::_mode = _mixed;
87 bool Arguments::_java_compiler = false;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 int Arguments::_sun_java_launcher_pid = -1;
92 bool Arguments::_sun_java_launcher_is_altjvm = false;
93
94 // These parameters are reset in method parse_vm_init_args()
95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
97 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
98 bool Arguments::_ClipInlining = ClipInlining;
99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
101
102 char* Arguments::SharedArchivePath = NULL;
103
104 AgentLibraryList Arguments::_libraryList;
105 AgentLibraryList Arguments::_agentList;
106
107 abort_hook_t Arguments::_abort_hook = NULL;
108 exit_hook_t Arguments::_exit_hook = NULL;
109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
110
111
112 SystemProperty *Arguments::_sun_boot_library_path = NULL;
113 SystemProperty *Arguments::_java_library_path = NULL;
114 SystemProperty *Arguments::_java_home = NULL;
115 SystemProperty *Arguments::_java_class_path = NULL;
116 SystemProperty *Arguments::_sun_boot_class_path = NULL;
117
118 char* Arguments::_ext_dirs = NULL;
119
120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
121 // part of the option string.
122 static bool match_option(const JavaVMOption *option, const char* name,
123 const char** tail) {
124 size_t len = strlen(name);
125 if (strncmp(option->optionString, name, len) == 0) {
126 *tail = option->optionString + len;
127 return true;
128 } else {
129 return false;
130 }
131 }
132
133 // Check if 'option' matches 'name'. No "tail" is allowed.
134 static bool match_option(const JavaVMOption *option, const char* name) {
135 const char* tail = NULL;
136 bool result = match_option(option, name, &tail);
137 if (tail != NULL && *tail == '\0') {
138 return result;
139 } else {
140 return false;
141 }
142 }
143
144 // Return true if any of the strings in null-terminated array 'names' matches.
145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
146 // the option must match exactly.
147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
148 bool tail_allowed) {
149 for (/* empty */; *names != NULL; ++names) {
150 if (match_option(option, *names, tail)) {
151 if (**tail == '\0' || tail_allowed && **tail == ':') {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 static void logOption(const char* opt) {
160 if (PrintVMOptions) {
161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
162 }
163 }
164
165 // Process java launcher properties.
166 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
167 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
168 // sun.java.launcher.pid is defined.
169 // Must do this before setting up other system properties,
170 // as some of them may depend on launcher type.
171 for (int index = 0; index < args->nOptions; index++) {
172 const JavaVMOption* option = args->options + index;
173 const char* tail;
174
175 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
176 process_java_launcher_argument(tail, option->extraInfo);
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
180 if (strcmp(tail, "true") == 0) {
181 _sun_java_launcher_is_altjvm = true;
182 }
183 continue;
184 }
185 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
186 _sun_java_launcher_pid = atoi(tail);
187 continue;
188 }
189 }
190 }
191
192 // Initialize system properties key and value.
193 void Arguments::init_system_properties() {
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
195 "Java Virtual Machine Specification", false));
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
197 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
199
200 // Following are JVMTI agent writable properties.
201 // Properties values are set to NULL and they are
202 // os specific they are initialized in os::init_system_properties_values().
203 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
204 _java_library_path = new SystemProperty("java.library.path", NULL, true);
205 _java_home = new SystemProperty("java.home", NULL, true);
206 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
207
208 _java_class_path = new SystemProperty("java.class.path", "", true);
209
210 // Add to System Property list.
211 PropertyList_add(&_system_properties, _sun_boot_library_path);
212 PropertyList_add(&_system_properties, _java_library_path);
213 PropertyList_add(&_system_properties, _java_home);
214 PropertyList_add(&_system_properties, _java_class_path);
215 PropertyList_add(&_system_properties, _sun_boot_class_path);
216
217 // Set OS specific system properties values
218 os::init_system_properties_values();
219
220 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
221 }
222
223 // Update/Initialize System properties after JDK version number is known
224 void Arguments::init_version_specific_system_properties() {
225 enum { bufsz = 16 };
226 char buffer[bufsz];
227 const char* spec_vendor = "Oracle Corporation";
228 uint32_t spec_version = JDK_Version::current().major_version();
229
230 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
231
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.specification.version", buffer, false));
236 PropertyList_add(&_system_properties,
237 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
238 }
239
240 /*
241 * -XX argument processing:
242 *
243 * -XX arguments are defined in several places, such as:
244 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
245 * -XX arguments are parsed in parse_argument().
246 * -XX argument bounds checking is done in check_vm_args_consistency().
247 *
248 * Over time -XX arguments may change. There are mechanisms to handle common cases:
249 *
250 * ALIASED: An option that is simply another name for another option. This is often
251 * part of the process of deprecating a flag, but not all aliases need
252 * to be deprecated.
253 *
254 * Create an alias for an option by adding the old and new option names to the
255 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
256 *
257 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
258 * support may be removed in the future. Both regular and aliased options may be
259 * deprecated.
260 *
261 * Add a deprecation warning for an option (or alias) by adding an entry in the
262 * "special_jvm_flags" table and setting the "deprecated_in" field.
263 * Often an option "deprecated" in one major release will
264 * be made "obsolete" in the next. In this case the entry should also have it's
265 * "obsolete_in" field set.
266 *
267 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
268 * on the command line. A warning is printed to let the user know that option might not
269 * be accepted in the future.
270 *
271 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
272 * table and setting the "obsolete_in" field.
273 *
274 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
275 * to the current JDK version. The system will flatly refuse to admit the existence of
276 * the flag. This allows a flag to die automatically over JDK releases.
277 *
278 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
279 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
280 * - Newly obsolete or expired deprecated options should have their global variable
281 * definitions removed (from globals.hpp, etc) and related implementations removed.
282 *
283 * Recommended approach for removing options:
284 *
285 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
286 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
287 *
288 * To remove internal options (e.g. diagnostic, experimental, develop options), use
289 * a 2-step model adding major release numbers to the obsolete and expire columns.
290 *
291 * To change the name of an option, use the alias table as well as a 2-step
292 * model adding major release numbers to the deprecate and expire columns.
293 * Think twice about aliasing commonly used customer options.
294 *
295 * There are times when it is appropriate to leave a future release number as undefined.
296 *
297 * Tests: Aliases should be tested in VMAliasOptions.java.
298 * Deprecated options should be tested in VMDeprecatedOptions.java.
299 */
300
301 // Obsolete or deprecated -XX flag.
302 typedef struct {
303 const char* name;
304 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
305 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
306 JDK_Version expired_in; // When the option expires (or "undefined").
307 } SpecialFlag;
308
309 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
310 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
311 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
312 // the command-line as usual, but will issue a warning.
313 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
314 // the command-line, while issuing a warning and ignoring the flag value.
315 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
316 // existence of the flag.
317 //
318 // MANUAL CLEANUP ON JDK VERSION UPDATES:
319 // This table ensures that the handling of options will update automatically when the JDK
320 // version is incremented, but the source code needs to be cleanup up manually:
321 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
322 // variable should be removed, as well as users of the variable.
323 // - As "deprecated" options age into "obsolete" options, move the entry into the
324 // "Obsolete Flags" section of the table.
325 // - All expired options should be removed from the table.
326 static SpecialFlag const special_jvm_flags[] = {
327 // -------------- Deprecated Flags --------------
328 // --- Non-alias flags - sorted by obsolete_in then expired_in:
329 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
330 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
331
332 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
333 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
334 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
335 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
336 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
337 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
338 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
339 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
340
341 // -------------- Obsolete Flags - sorted by expired_in --------------
342 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
343 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
344 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
345 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
346 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
347 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
348 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
349 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 #ifndef ZERO
356 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 #endif // ZERO
359 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366
367 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
368 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
369 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
370 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
371 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
372 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
373 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
374 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
375 #endif
376
377 { NULL, JDK_Version(0), JDK_Version(0) }
378 };
379
380 // Flags that are aliases for other flags.
381 typedef struct {
382 const char* alias_name;
383 const char* real_name;
384 } AliasedFlag;
385
386 static AliasedFlag const aliased_jvm_flags[] = {
387 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
388 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
389 { "CMSMarkStackSize", "MarkStackSize" },
390 { "G1MarkStackSize", "MarkStackSize" },
391 { "ParallelMarkingThreads", "ConcGCThreads" },
392 { "ParallelCMSThreads", "ConcGCThreads" },
393 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
394 { NULL, NULL}
395 };
396
397 // Return true if "v" is less than "other", where "other" may be "undefined".
398 static bool version_less_than(JDK_Version v, JDK_Version other) {
399 assert(!v.is_undefined(), "must be defined");
400 if (!other.is_undefined() && v.compare(other) >= 0) {
401 return false;
402 } else {
403 return true;
404 }
405 }
406
407 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
408 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
409 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
410 flag = special_jvm_flags[i];
411 return true;
412 }
413 }
414 return false;
415 }
416
417 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
418 assert(version != NULL, "Must provide a version buffer");
419 SpecialFlag flag;
420 if (lookup_special_flag(flag_name, flag)) {
421 if (!flag.obsolete_in.is_undefined()) {
422 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
423 *version = flag.obsolete_in;
424 return true;
425 }
426 }
427 }
428 return false;
429 }
430
431 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
432 assert(version != NULL, "Must provide a version buffer");
433 SpecialFlag flag;
434 if (lookup_special_flag(flag_name, flag)) {
435 if (!flag.deprecated_in.is_undefined()) {
436 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
437 version_less_than(JDK_Version::current(), flag.expired_in)) {
438 *version = flag.deprecated_in;
439 return 1;
440 } else {
441 return -1;
442 }
443 }
444 }
445 return 0;
446 }
447
448 const char* Arguments::real_flag_name(const char *flag_name) {
449 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
450 const AliasedFlag& flag_status = aliased_jvm_flags[i];
451 if (strcmp(flag_status.alias_name, flag_name) == 0) {
452 return flag_status.real_name;
453 }
454 }
455 return flag_name;
456 }
457
458 #ifndef PRODUCT
459 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
460 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
461 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
462 return true;
463 }
464 }
465 return false;
466 }
467
468 static bool verify_special_jvm_flags() {
469 bool success = true;
470 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
471 const SpecialFlag& flag = special_jvm_flags[i];
472 if (lookup_special_flag(flag.name, i)) {
473 warning("Duplicate special flag declaration \"%s\"", flag.name);
474 success = false;
475 }
476 if (flag.deprecated_in.is_undefined() &&
477 flag.obsolete_in.is_undefined()) {
478 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
479 success = false;
480 }
481
482 if (!flag.deprecated_in.is_undefined()) {
483 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
484 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
485 success = false;
486 }
487
488 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
489 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
490 success = false;
491 }
492 }
493
494 if (!flag.obsolete_in.is_undefined()) {
495 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
496 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
497 success = false;
498 }
499
500 // if flag has become obsolete it should not have a "globals" flag defined anymore.
501 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
502 if (Flag::find_flag(flag.name) != NULL) {
503 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
504 success = false;
505 }
506 }
507 }
508
509 if (!flag.expired_in.is_undefined()) {
510 // if flag has become expired it should not have a "globals" flag defined anymore.
511 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
512 if (Flag::find_flag(flag.name) != NULL) {
513 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
514 success = false;
515 }
516 }
517 }
518
519 }
520 return success;
521 }
522 #endif
523
524 // Constructs the system class path (aka boot class path) from the following
525 // components, in order:
526 //
527 // prefix // from -Xbootclasspath/p:...
528 // base // from os::get_system_properties() or -Xbootclasspath=
529 // suffix // from -Xbootclasspath/a:...
530 //
531 // This could be AllStatic, but it isn't needed after argument processing is
532 // complete.
533 class SysClassPath: public StackObj {
534 public:
535 SysClassPath(const char* base);
536 ~SysClassPath();
537
538 inline void set_base(const char* base);
539 inline void add_prefix(const char* prefix);
540 inline void add_suffix_to_prefix(const char* suffix);
541 inline void add_suffix(const char* suffix);
542 inline void reset_path(const char* base);
543
544 inline const char* get_base() const { return _items[_scp_base]; }
545 inline const char* get_prefix() const { return _items[_scp_prefix]; }
546 inline const char* get_suffix() const { return _items[_scp_suffix]; }
547
548 // Combine all the components into a single c-heap-allocated string; caller
549 // must free the string if/when no longer needed.
550 char* combined_path();
551
552 private:
553 // Utility routines.
554 static char* add_to_path(const char* path, const char* str, bool prepend);
555 static char* add_jars_to_path(char* path, const char* directory);
556
557 inline void reset_item_at(int index);
558
559 // Array indices for the items that make up the sysclasspath. All except the
560 // base are allocated in the C heap and freed by this class.
561 enum {
562 _scp_prefix, // from -Xbootclasspath/p:...
563 _scp_base, // the default sysclasspath
564 _scp_suffix, // from -Xbootclasspath/a:...
565 _scp_nitems // the number of items, must be last.
566 };
567
568 const char* _items[_scp_nitems];
569 };
570
571 SysClassPath::SysClassPath(const char* base) {
572 memset(_items, 0, sizeof(_items));
573 _items[_scp_base] = base;
574 }
575
576 SysClassPath::~SysClassPath() {
577 // Free everything except the base.
578 for (int i = 0; i < _scp_nitems; ++i) {
579 if (i != _scp_base) reset_item_at(i);
580 }
581 }
582
583 inline void SysClassPath::set_base(const char* base) {
584 _items[_scp_base] = base;
585 }
586
587 inline void SysClassPath::add_prefix(const char* prefix) {
588 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
589 }
590
591 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
592 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
593 }
594
595 inline void SysClassPath::add_suffix(const char* suffix) {
596 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
597 }
598
599 inline void SysClassPath::reset_item_at(int index) {
600 assert(index < _scp_nitems && index != _scp_base, "just checking");
601 if (_items[index] != NULL) {
602 FREE_C_HEAP_ARRAY(char, _items[index]);
603 _items[index] = NULL;
604 }
605 }
606
607 inline void SysClassPath::reset_path(const char* base) {
608 // Clear the prefix and suffix.
609 reset_item_at(_scp_prefix);
610 reset_item_at(_scp_suffix);
611 set_base(base);
612 }
613
614 //------------------------------------------------------------------------------
615
616
617 // Combine the bootclasspath elements, some of which may be null, into a single
618 // c-heap-allocated string.
619 char* SysClassPath::combined_path() {
620 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
621
622 size_t lengths[_scp_nitems];
623 size_t total_len = 0;
624
625 const char separator = *os::path_separator();
626
627 // Get the lengths.
628 int i;
629 for (i = 0; i < _scp_nitems; ++i) {
630 if (_items[i] != NULL) {
631 lengths[i] = strlen(_items[i]);
632 // Include space for the separator char (or a NULL for the last item).
633 total_len += lengths[i] + 1;
634 }
635 }
636 assert(total_len > 0, "empty sysclasspath not allowed");
637
638 // Copy the _items to a single string.
639 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
640 char* cp_tmp = cp;
641 for (i = 0; i < _scp_nitems; ++i) {
642 if (_items[i] != NULL) {
643 memcpy(cp_tmp, _items[i], lengths[i]);
644 cp_tmp += lengths[i];
645 *cp_tmp++ = separator;
646 }
647 }
648 *--cp_tmp = '\0'; // Replace the extra separator.
649 return cp;
650 }
651
652 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
653 char*
654 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
655 char *cp;
656
657 assert(str != NULL, "just checking");
658 if (path == NULL) {
659 size_t len = strlen(str) + 1;
660 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
661 memcpy(cp, str, len); // copy the trailing null
662 } else {
663 const char separator = *os::path_separator();
664 size_t old_len = strlen(path);
665 size_t str_len = strlen(str);
666 size_t len = old_len + str_len + 2;
667
668 if (prepend) {
669 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
670 char* cp_tmp = cp;
671 memcpy(cp_tmp, str, str_len);
672 cp_tmp += str_len;
673 *cp_tmp = separator;
674 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
675 FREE_C_HEAP_ARRAY(char, path);
676 } else {
677 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
678 char* cp_tmp = cp + old_len;
679 *cp_tmp = separator;
680 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
681 }
682 }
683 return cp;
684 }
685
686 // Scan the directory and append any jar or zip files found to path.
687 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
688 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
689 DIR* dir = os::opendir(directory);
690 if (dir == NULL) return path;
691
692 char dir_sep[2] = { '\0', '\0' };
693 size_t directory_len = strlen(directory);
694 const char fileSep = *os::file_separator();
695 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
696
697 /* Scan the directory for jars/zips, appending them to path. */
698 struct dirent *entry;
699 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
700 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
701 const char* name = entry->d_name;
702 const char* ext = name + strlen(name) - 4;
703 bool isJarOrZip = ext > name &&
704 (os::file_name_strcmp(ext, ".jar") == 0 ||
705 os::file_name_strcmp(ext, ".zip") == 0);
706 if (isJarOrZip) {
707 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
708 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
709 path = add_to_path(path, jarpath, false);
710 FREE_C_HEAP_ARRAY(char, jarpath);
711 }
712 }
713 FREE_C_HEAP_ARRAY(char, dbuf);
714 os::closedir(dir);
715 return path;
716 }
717
718 // Parses a memory size specification string.
719 static bool atomull(const char *s, julong* result) {
720 julong n = 0;
721 int args_read = 0;
722 bool is_hex = false;
723 // Skip leading 0[xX] for hexadecimal
724 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
725 s += 2;
726 is_hex = true;
727 args_read = sscanf(s, JULONG_FORMAT_X, &n);
728 } else {
729 args_read = sscanf(s, JULONG_FORMAT, &n);
730 }
731 if (args_read != 1) {
732 return false;
733 }
734 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
735 s++;
736 }
737 // 4705540: illegal if more characters are found after the first non-digit
738 if (strlen(s) > 1) {
739 return false;
740 }
741 switch (*s) {
742 case 'T': case 't':
743 *result = n * G * K;
744 // Check for overflow.
745 if (*result/((julong)G * K) != n) return false;
746 return true;
747 case 'G': case 'g':
748 *result = n * G;
749 if (*result/G != n) return false;
750 return true;
751 case 'M': case 'm':
752 *result = n * M;
753 if (*result/M != n) return false;
754 return true;
755 case 'K': case 'k':
756 *result = n * K;
757 if (*result/K != n) return false;
758 return true;
759 case '\0':
760 *result = n;
761 return true;
762 default:
763 return false;
764 }
765 }
766
767 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
768 if (size < min_size) return arg_too_small;
769 // Check that size will fit in a size_t (only relevant on 32-bit)
770 if (size > max_uintx) return arg_too_big;
771 return arg_in_range;
772 }
773
774 // Describe an argument out of range error
775 void Arguments::describe_range_error(ArgsRange errcode) {
776 switch(errcode) {
777 case arg_too_big:
778 jio_fprintf(defaultStream::error_stream(),
779 "The specified size exceeds the maximum "
780 "representable size.\n");
781 break;
782 case arg_too_small:
783 case arg_unreadable:
784 case arg_in_range:
785 // do nothing for now
786 break;
787 default:
788 ShouldNotReachHere();
789 }
790 }
791
792 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
793 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
794 return true;
795 } else {
796 return false;
797 }
798 }
799
800 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
801 double v;
802 if (sscanf(value, "%lf", &v) != 1) {
803 return false;
804 }
805
806 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
807 return true;
808 }
809 return false;
810 }
811
812 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
813 julong v;
814 int int_v;
815 intx intx_v;
816 bool is_neg = false;
817 // Check the sign first since atomull() parses only unsigned values.
818 if (*value == '-') {
819 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
820 return false;
821 }
822 value++;
823 is_neg = true;
824 }
825 if (!atomull(value, &v)) {
826 return false;
827 }
828 int_v = (int) v;
829 if (is_neg) {
830 int_v = -int_v;
831 }
832 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
833 return true;
834 }
835 uint uint_v = (uint) v;
836 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
837 return true;
838 }
839 intx_v = (intx) v;
840 if (is_neg) {
841 intx_v = -intx_v;
842 }
843 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
844 return true;
845 }
846 uintx uintx_v = (uintx) v;
847 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
848 return true;
849 }
850 uint64_t uint64_t_v = (uint64_t) v;
851 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
852 return true;
853 }
854 size_t size_t_v = (size_t) v;
855 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
856 return true;
857 }
858 return false;
859 }
860
861 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
862 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
863 // Contract: CommandLineFlags always returns a pointer that needs freeing.
864 FREE_C_HEAP_ARRAY(char, value);
865 return true;
866 }
867
868 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
869 const char* old_value = "";
870 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
871 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
872 size_t new_len = strlen(new_value);
873 const char* value;
874 char* free_this_too = NULL;
875 if (old_len == 0) {
876 value = new_value;
877 } else if (new_len == 0) {
878 value = old_value;
879 } else {
880 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
881 // each new setting adds another LINE to the switch:
882 sprintf(buf, "%s\n%s", old_value, new_value);
883 value = buf;
884 free_this_too = buf;
885 }
886 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
887 // CommandLineFlags always returns a pointer that needs freeing.
888 FREE_C_HEAP_ARRAY(char, value);
889 if (free_this_too != NULL) {
890 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
891 FREE_C_HEAP_ARRAY(char, free_this_too);
892 }
893 return true;
894 }
895
896 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
897 const char* real_name = real_flag_name(arg);
898 JDK_Version since = JDK_Version();
899 switch (is_deprecated_flag(arg, &since)) {
900 case -1:
901 return NULL; // obsolete or expired, don't process normally
902 case 0:
903 return real_name;
904 case 1: {
905 if (warn) {
906 char version[256];
907 since.to_string(version, sizeof(version));
908 if (real_name != arg) {
909 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
910 arg, version, real_name);
911 } else {
912 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
913 arg, version);
914 }
915 }
916 return real_name;
917 }
918 }
919 ShouldNotReachHere();
920 return NULL;
921 }
922
923 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
924
925 // range of acceptable characters spelled out for portability reasons
926 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
927 #define BUFLEN 255
928 char name[BUFLEN+1];
929 char dummy;
930 const char* real_name;
931 bool warn_if_deprecated = true;
932
933 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
934 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
935 if (real_name == NULL) {
936 return false;
937 }
938 return set_bool_flag(real_name, false, origin);
939 }
940 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
941 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
942 if (real_name == NULL) {
943 return false;
944 }
945 return set_bool_flag(real_name, true, origin);
946 }
947
948 char punct;
949 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
950 const char* value = strchr(arg, '=') + 1;
951 Flag* flag;
952
953 // this scanf pattern matches both strings (handled here) and numbers (handled later))
954 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
955 if (real_name == NULL) {
956 return false;
957 }
958 flag = Flag::find_flag(real_name);
959 if (flag != NULL && flag->is_ccstr()) {
960 if (flag->ccstr_accumulates()) {
961 return append_to_string_flag(real_name, value, origin);
962 } else {
963 if (value[0] == '\0') {
964 value = NULL;
965 }
966 return set_string_flag(real_name, value, origin);
967 }
968 } else {
969 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
970 }
971 }
972
973 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
974 const char* value = strchr(arg, '=') + 1;
975 // -XX:Foo:=xxx will reset the string flag to the given value.
976 if (value[0] == '\0') {
977 value = NULL;
978 }
979 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
980 if (real_name == NULL) {
981 return false;
982 }
983 return set_string_flag(real_name, value, origin);
984 }
985
986 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
987 #define SIGNED_NUMBER_RANGE "[-0123456789]"
988 #define NUMBER_RANGE "[0123456789]"
989 char value[BUFLEN + 1];
990 char value2[BUFLEN + 1];
991 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
992 // Looks like a floating-point number -- try again with more lenient format string
993 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
994 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
995 if (real_name == NULL) {
996 return false;
997 }
998 return set_fp_numeric_flag(real_name, value, origin);
999 }
1000 }
1001
1002 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1003 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1004 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1005 if (real_name == NULL) {
1006 return false;
1007 }
1008 return set_numeric_flag(real_name, value, origin);
1009 }
1010
1011 return false;
1012 }
1013
1014 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1015 assert(bldarray != NULL, "illegal argument");
1016
1017 if (arg == NULL) {
1018 return;
1019 }
1020
1021 int new_count = *count + 1;
1022
1023 // expand the array and add arg to the last element
1024 if (*bldarray == NULL) {
1025 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1026 } else {
1027 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1028 }
1029 (*bldarray)[*count] = os::strdup_check_oom(arg);
1030 *count = new_count;
1031 }
1032
1033 void Arguments::build_jvm_args(const char* arg) {
1034 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1035 }
1036
1037 void Arguments::build_jvm_flags(const char* arg) {
1038 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1039 }
1040
1041 // utility function to return a string that concatenates all
1042 // strings in a given char** array
1043 const char* Arguments::build_resource_string(char** args, int count) {
1044 if (args == NULL || count == 0) {
1045 return NULL;
1046 }
1047 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1048 for (int i = 1; i < count; i++) {
1049 length += strlen(args[i]) + 1; // add 1 for a space
1050 }
1051 char* s = NEW_RESOURCE_ARRAY(char, length);
1052 strcpy(s, args[0]);
1053 for (int j = 1; j < count; j++) {
1054 strcat(s, " ");
1055 strcat(s, args[j]);
1056 }
1057 return (const char*) s;
1058 }
1059
1060 void Arguments::print_on(outputStream* st) {
1061 st->print_cr("VM Arguments:");
1062 if (num_jvm_flags() > 0) {
1063 st->print("jvm_flags: "); print_jvm_flags_on(st);
1064 st->cr();
1065 }
1066 if (num_jvm_args() > 0) {
1067 st->print("jvm_args: "); print_jvm_args_on(st);
1068 st->cr();
1069 }
1070 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1071 if (_java_class_path != NULL) {
1072 char* path = _java_class_path->value();
1073 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1074 }
1075 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1076 }
1077
1078 void Arguments::print_summary_on(outputStream* st) {
1079 // Print the command line. Environment variables that are helpful for
1080 // reproducing the problem are written later in the hs_err file.
1081 // flags are from setting file
1082 if (num_jvm_flags() > 0) {
1083 st->print_raw("Settings File: ");
1084 print_jvm_flags_on(st);
1085 st->cr();
1086 }
1087 // args are the command line and environment variable arguments.
1088 st->print_raw("Command Line: ");
1089 if (num_jvm_args() > 0) {
1090 print_jvm_args_on(st);
1091 }
1092 // this is the classfile and any arguments to the java program
1093 if (java_command() != NULL) {
1094 st->print("%s", java_command());
1095 }
1096 st->cr();
1097 }
1098
1099 void Arguments::print_jvm_flags_on(outputStream* st) {
1100 if (_num_jvm_flags > 0) {
1101 for (int i=0; i < _num_jvm_flags; i++) {
1102 st->print("%s ", _jvm_flags_array[i]);
1103 }
1104 }
1105 }
1106
1107 void Arguments::print_jvm_args_on(outputStream* st) {
1108 if (_num_jvm_args > 0) {
1109 for (int i=0; i < _num_jvm_args; i++) {
1110 st->print("%s ", _jvm_args_array[i]);
1111 }
1112 }
1113 }
1114
1115 bool Arguments::process_argument(const char* arg,
1116 jboolean ignore_unrecognized,
1117 Flag::Flags origin) {
1118 JDK_Version since = JDK_Version();
1119
1120 if (parse_argument(arg, origin) || ignore_unrecognized) {
1121 return true;
1122 }
1123
1124 // Determine if the flag has '+', '-', or '=' characters.
1125 bool has_plus_minus = (*arg == '+' || *arg == '-');
1126 const char* const argname = has_plus_minus ? arg + 1 : arg;
1127
1128 size_t arg_len;
1129 const char* equal_sign = strchr(argname, '=');
1130 if (equal_sign == NULL) {
1131 arg_len = strlen(argname);
1132 } else {
1133 arg_len = equal_sign - argname;
1134 }
1135
1136 // Only make the obsolete check for valid arguments.
1137 if (arg_len <= BUFLEN) {
1138 // Construct a string which consists only of the argument name without '+', '-', or '='.
1139 char stripped_argname[BUFLEN+1];
1140 strncpy(stripped_argname, argname, arg_len);
1141 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1142
1143 if (is_obsolete_flag(stripped_argname, &since)) {
1144 char version[256];
1145 since.to_string(version, sizeof(version));
1146 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1147 return true;
1148 }
1149 }
1150
1151 // For locked flags, report a custom error message if available.
1152 // Otherwise, report the standard unrecognized VM option.
1153 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1154 if (found_flag != NULL) {
1155 char locked_message_buf[BUFLEN];
1156 found_flag->get_locked_message(locked_message_buf, BUFLEN);
1157 if (strlen(locked_message_buf) == 0) {
1158 if (found_flag->is_bool() && !has_plus_minus) {
1159 jio_fprintf(defaultStream::error_stream(),
1160 "Missing +/- setting for VM option '%s'\n", argname);
1161 } else if (!found_flag->is_bool() && has_plus_minus) {
1162 jio_fprintf(defaultStream::error_stream(),
1163 "Unexpected +/- setting in VM option '%s'\n", argname);
1164 } else {
1165 jio_fprintf(defaultStream::error_stream(),
1166 "Improperly specified VM option '%s'\n", argname);
1167 }
1168 } else {
1169 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1170 }
1171 } else {
1172 jio_fprintf(defaultStream::error_stream(),
1173 "Unrecognized VM option '%s'\n", argname);
1174 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1175 if (fuzzy_matched != NULL) {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Did you mean '%s%s%s'? ",
1178 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1179 fuzzy_matched->_name,
1180 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1181 }
1182 }
1183
1184 // allow for commandline "commenting out" options like -XX:#+Verbose
1185 return arg[0] == '#';
1186 }
1187
1188 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1189 FILE* stream = fopen(file_name, "rb");
1190 if (stream == NULL) {
1191 if (should_exist) {
1192 jio_fprintf(defaultStream::error_stream(),
1193 "Could not open settings file %s\n", file_name);
1194 return false;
1195 } else {
1196 return true;
1197 }
1198 }
1199
1200 char token[1024];
1201 int pos = 0;
1202
1203 bool in_white_space = true;
1204 bool in_comment = false;
1205 bool in_quote = false;
1206 char quote_c = 0;
1207 bool result = true;
1208
1209 int c = getc(stream);
1210 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1211 if (in_white_space) {
1212 if (in_comment) {
1213 if (c == '\n') in_comment = false;
1214 } else {
1215 if (c == '#') in_comment = true;
1216 else if (!isspace(c)) {
1217 in_white_space = false;
1218 token[pos++] = c;
1219 }
1220 }
1221 } else {
1222 if (c == '\n' || (!in_quote && isspace(c))) {
1223 // token ends at newline, or at unquoted whitespace
1224 // this allows a way to include spaces in string-valued options
1225 token[pos] = '\0';
1226 logOption(token);
1227 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1228 build_jvm_flags(token);
1229 pos = 0;
1230 in_white_space = true;
1231 in_quote = false;
1232 } else if (!in_quote && (c == '\'' || c == '"')) {
1233 in_quote = true;
1234 quote_c = c;
1235 } else if (in_quote && (c == quote_c)) {
1236 in_quote = false;
1237 } else {
1238 token[pos++] = c;
1239 }
1240 }
1241 c = getc(stream);
1242 }
1243 if (pos > 0) {
1244 token[pos] = '\0';
1245 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1246 build_jvm_flags(token);
1247 }
1248 fclose(stream);
1249 return result;
1250 }
1251
1252 //=============================================================================================================
1253 // Parsing of properties (-D)
1254
1255 const char* Arguments::get_property(const char* key) {
1256 return PropertyList_get_value(system_properties(), key);
1257 }
1258
1259 bool Arguments::add_property(const char* prop) {
1260 const char* eq = strchr(prop, '=');
1261 const char* key;
1262 const char* value = "";
1263
1264 if (eq == NULL) {
1265 // property doesn't have a value, thus use passed string
1266 key = prop;
1267 } else {
1268 // property have a value, thus extract it and save to the
1269 // allocated string
1270 size_t key_len = eq - prop;
1271 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1272
1273 strncpy(tmp_key, prop, key_len);
1274 tmp_key[key_len] = '\0';
1275 key = tmp_key;
1276
1277 value = &prop[key_len + 1];
1278 }
1279
1280 if (strcmp(key, "java.compiler") == 0) {
1281 process_java_compiler_argument(value);
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 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1289 PropertyList_unique_add(&_system_properties, key, value, true);
1290 } else {
1291 if (strcmp(key, "sun.java.command") == 0) {
1292 if (_java_command != NULL) {
1293 os::free(_java_command);
1294 }
1295 _java_command = os::strdup_check_oom(value, mtInternal);
1296 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1297 if (_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1298 assert(_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1299 os::free((void *)_java_vendor_url_bug);
1300 }
1301 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1302 // its value without going through the property list or making a Java call.
1303 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1304 }
1305
1306 // Create new property and add at the end of the list
1307 PropertyList_unique_add(&_system_properties, key, value);
1308 }
1309
1310 if (key != prop) {
1311 // SystemProperty copy passed value, thus free previously allocated
1312 // memory
1313 FreeHeap((void *)key);
1314 }
1315
1316 return true;
1317 }
1318
1319 //===========================================================================================================
1320 // Setting int/mixed/comp mode flags
1321
1322 void Arguments::set_mode_flags(Mode mode) {
1323 // Set up default values for all flags.
1324 // If you add a flag to any of the branches below,
1325 // add a default value for it here.
1326 set_java_compiler(false);
1327 _mode = mode;
1328
1329 // Ensure Agent_OnLoad has the correct initial values.
1330 // This may not be the final mode; mode may change later in onload phase.
1331 PropertyList_unique_add(&_system_properties, "java.vm.info",
1332 VM_Version::vm_info_string(), false);
1333
1334 UseInterpreter = true;
1335 UseCompiler = true;
1336 UseLoopCounter = true;
1337
1338 // Default values may be platform/compiler dependent -
1339 // use the saved values
1340 ClipInlining = Arguments::_ClipInlining;
1341 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1342 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1343 BackgroundCompilation = Arguments::_BackgroundCompilation;
1344 if (TieredCompilation) {
1345 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1346 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1347 }
1348 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1349 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1350 }
1351 }
1352
1353 // Change from defaults based on mode
1354 switch (mode) {
1355 default:
1356 ShouldNotReachHere();
1357 break;
1358 case _int:
1359 UseCompiler = false;
1360 UseLoopCounter = false;
1361 AlwaysCompileLoopMethods = false;
1362 UseOnStackReplacement = false;
1363 break;
1364 case _mixed:
1365 // same as default
1366 break;
1367 case _comp:
1368 UseInterpreter = false;
1369 BackgroundCompilation = false;
1370 ClipInlining = false;
1371 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1372 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1373 // compile a level 4 (C2) and then continue executing it.
1374 if (TieredCompilation) {
1375 Tier3InvokeNotifyFreqLog = 0;
1376 Tier4InvocationThreshold = 0;
1377 }
1378 break;
1379 }
1380 }
1381
1382 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1383 // Conflict: required to use shared spaces (-Xshare:on), but
1384 // incompatible command line options were chosen.
1385
1386 static void no_shared_spaces(const char* message) {
1387 if (RequireSharedSpaces) {
1388 jio_fprintf(defaultStream::error_stream(),
1389 "Class data sharing is inconsistent with other specified options.\n");
1390 vm_exit_during_initialization("Unable to use shared archive.", message);
1391 } else {
1392 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1393 }
1394 }
1395 #endif
1396
1397 // Returns threshold scaled with the value of scale.
1398 // If scale < 0.0, threshold is returned without scaling.
1399 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1400 if (scale == 1.0 || scale < 0.0) {
1401 return threshold;
1402 } else {
1403 return (intx)(threshold * scale);
1404 }
1405 }
1406
1407 // Returns freq_log scaled with the value of scale.
1408 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1409 // If scale < 0.0, freq_log is returned without scaling.
1410 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1411 // Check if scaling is necessary or if negative value was specified.
1412 if (scale == 1.0 || scale < 0.0) {
1413 return freq_log;
1414 }
1415 // Check values to avoid calculating log2 of 0.
1416 if (scale == 0.0 || freq_log == 0) {
1417 return 0;
1418 }
1419 // Determine the maximum notification frequency value currently supported.
1420 // The largest mask value that the interpreter/C1 can handle is
1421 // of length InvocationCounter::number_of_count_bits. Mask values are always
1422 // one bit shorter then the value of the notification frequency. Set
1423 // max_freq_bits accordingly.
1424 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1425 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1426 if (scaled_freq == 0) {
1427 // Return 0 right away to avoid calculating log2 of 0.
1428 return 0;
1429 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1430 return max_freq_bits;
1431 } else {
1432 return log2_intptr(scaled_freq);
1433 }
1434 }
1435
1436 void Arguments::set_tiered_flags() {
1437 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1438 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1439 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1440 }
1441 if (CompilationPolicyChoice < 2) {
1442 vm_exit_during_initialization(
1443 "Incompatible compilation policy selected", NULL);
1444 }
1445 // Increase the code cache size - tiered compiles a lot more.
1446 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1447 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1448 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1449 }
1450 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1451 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1452 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1453
1454 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1455 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1456 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1457 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1458 }
1459 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1460 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1461 }
1462 // Check consistency of code heap sizes
1463 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1464 jio_fprintf(defaultStream::error_stream(),
1465 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1466 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1467 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1468 vm_exit(1);
1469 }
1470 }
1471 }
1472 if (!UseInterpreter) { // -Xcomp
1473 Tier3InvokeNotifyFreqLog = 0;
1474 Tier4InvocationThreshold = 0;
1475 }
1476
1477 if (CompileThresholdScaling < 0) {
1478 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1479 }
1480
1481 // Scale tiered compilation thresholds.
1482 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1483 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1484 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1485 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1486
1487 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1488 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1489 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1490 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1491
1492 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1493 // once these thresholds become supported.
1494
1495 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1496 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1497
1498 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1499 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1500
1501 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1502
1503 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1504 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1505 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1506 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1507 }
1508 }
1509
1510 #if INCLUDE_ALL_GCS
1511 static void disable_adaptive_size_policy(const char* collector_name) {
1512 if (UseAdaptiveSizePolicy) {
1513 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1514 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1515 collector_name);
1516 }
1517 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1518 }
1519 }
1520
1521 void Arguments::set_parnew_gc_flags() {
1522 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1523 "control point invariant");
1524 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1525 assert(UseParNewGC, "ParNew should always be used with CMS");
1526
1527 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1528 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1529 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1530 } else if (ParallelGCThreads == 0) {
1531 jio_fprintf(defaultStream::error_stream(),
1532 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1533 vm_exit(1);
1534 }
1535
1536 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1537 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1538 // we set them to 1024 and 1024.
1539 // See CR 6362902.
1540 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1541 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1542 }
1543 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1544 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1545 }
1546
1547 // When using compressed oops, we use local overflow stacks,
1548 // rather than using a global overflow list chained through
1549 // the klass word of the object's pre-image.
1550 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1551 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1552 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1553 }
1554 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1555 }
1556 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1557 }
1558
1559 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1560 // sparc/solaris for certain applications, but would gain from
1561 // further optimization and tuning efforts, and would almost
1562 // certainly gain from analysis of platform and environment.
1563 void Arguments::set_cms_and_parnew_gc_flags() {
1564 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1565 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1566 assert(UseParNewGC, "ParNew should always be used with CMS");
1567
1568 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1569 disable_adaptive_size_policy("UseConcMarkSweepGC");
1570
1571 set_parnew_gc_flags();
1572
1573 size_t max_heap = align_size_down(MaxHeapSize,
1574 CardTableRS::ct_max_alignment_constraint());
1575
1576 // Now make adjustments for CMS
1577 intx tenuring_default = (intx)6;
1578 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1579
1580 // Preferred young gen size for "short" pauses:
1581 // upper bound depends on # of threads and NewRatio.
1582 const size_t preferred_max_new_size_unaligned =
1583 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1584 size_t preferred_max_new_size =
1585 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1586
1587 // Unless explicitly requested otherwise, size young gen
1588 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1589
1590 // If either MaxNewSize or NewRatio is set on the command line,
1591 // assume the user is trying to set the size of the young gen.
1592 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1593
1594 // Set MaxNewSize to our calculated preferred_max_new_size unless
1595 // NewSize was set on the command line and it is larger than
1596 // preferred_max_new_size.
1597 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1598 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1599 } else {
1600 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1601 }
1602 if (PrintGCDetails && Verbose) {
1603 // Too early to use gclog_or_tty
1604 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1605 }
1606
1607 // Code along this path potentially sets NewSize and OldSize
1608 if (PrintGCDetails && Verbose) {
1609 // Too early to use gclog_or_tty
1610 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1611 " initial_heap_size: " SIZE_FORMAT
1612 " max_heap: " SIZE_FORMAT,
1613 min_heap_size(), InitialHeapSize, max_heap);
1614 }
1615 size_t min_new = preferred_max_new_size;
1616 if (FLAG_IS_CMDLINE(NewSize)) {
1617 min_new = NewSize;
1618 }
1619 if (max_heap > min_new && min_heap_size() > min_new) {
1620 // Unless explicitly requested otherwise, make young gen
1621 // at least min_new, and at most preferred_max_new_size.
1622 if (FLAG_IS_DEFAULT(NewSize)) {
1623 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1624 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1625 if (PrintGCDetails && Verbose) {
1626 // Too early to use gclog_or_tty
1627 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1628 }
1629 }
1630 // Unless explicitly requested otherwise, size old gen
1631 // so it's NewRatio x of NewSize.
1632 if (FLAG_IS_DEFAULT(OldSize)) {
1633 if (max_heap > NewSize) {
1634 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1635 if (PrintGCDetails && Verbose) {
1636 // Too early to use gclog_or_tty
1637 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1638 }
1639 }
1640 }
1641 }
1642 }
1643 // Unless explicitly requested otherwise, definitely
1644 // promote all objects surviving "tenuring_default" scavenges.
1645 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1646 FLAG_IS_DEFAULT(SurvivorRatio)) {
1647 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1648 }
1649 // If we decided above (or user explicitly requested)
1650 // `promote all' (via MaxTenuringThreshold := 0),
1651 // prefer minuscule survivor spaces so as not to waste
1652 // space for (non-existent) survivors
1653 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1654 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1655 }
1656
1657 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1658 // but rather the number of free blocks of a given size that are used when
1659 // replenishing the local per-worker free list caches.
1660 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1661 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1662 // OldPLAB sizing manually turned off: Use a larger default setting,
1663 // unless it was manually specified. This is because a too-low value
1664 // will slow down scavenges.
1665 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1666 } else {
1667 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1668 }
1669 }
1670
1671 // If either of the static initialization defaults have changed, note this
1672 // modification.
1673 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1674 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1675 }
1676
1677 if (!ClassUnloading) {
1678 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1679 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1680 }
1681
1682 if (PrintGCDetails && Verbose) {
1683 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1684 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1685 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1686 }
1687 }
1688 #endif // INCLUDE_ALL_GCS
1689
1690 void set_object_alignment() {
1691 // Object alignment.
1692 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1693 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1694 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1695 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1696 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1697 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1698
1699 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1700 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1701
1702 // Oop encoding heap max
1703 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1704
1705 if (SurvivorAlignmentInBytes == 0) {
1706 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1707 }
1708
1709 #if INCLUDE_ALL_GCS
1710 // Set CMS global values
1711 CompactibleFreeListSpace::set_cms_values();
1712 #endif // INCLUDE_ALL_GCS
1713 }
1714
1715 size_t Arguments::max_heap_for_compressed_oops() {
1716 // Avoid sign flip.
1717 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1718 // We need to fit both the NULL page and the heap into the memory budget, while
1719 // keeping alignment constraints of the heap. To guarantee the latter, as the
1720 // NULL page is located before the heap, we pad the NULL page to the conservative
1721 // maximum alignment that the GC may ever impose upon the heap.
1722 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1723 _conservative_max_heap_alignment);
1724
1725 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1726 NOT_LP64(ShouldNotReachHere(); return 0);
1727 }
1728
1729 bool Arguments::should_auto_select_low_pause_collector() {
1730 if (UseAutoGCSelectPolicy &&
1731 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1732 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1733 if (PrintGCDetails) {
1734 // Cannot use gclog_or_tty yet.
1735 tty->print_cr("Automatic selection of the low pause collector"
1736 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1737 }
1738 return true;
1739 }
1740 return false;
1741 }
1742
1743 void Arguments::set_use_compressed_oops() {
1744 #ifndef ZERO
1745 #ifdef _LP64
1746 // MaxHeapSize is not set up properly at this point, but
1747 // the only value that can override MaxHeapSize if we are
1748 // to use UseCompressedOops is InitialHeapSize.
1749 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1750
1751 if (max_heap_size <= max_heap_for_compressed_oops()) {
1752 #if !defined(COMPILER1) || defined(TIERED)
1753 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1754 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1755 }
1756 #endif
1757 } else {
1758 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1759 warning("Max heap size too large for Compressed Oops");
1760 FLAG_SET_DEFAULT(UseCompressedOops, false);
1761 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1762 }
1763 }
1764 #endif // _LP64
1765 #endif // ZERO
1766 }
1767
1768
1769 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1770 // set_use_compressed_oops().
1771 void Arguments::set_use_compressed_klass_ptrs() {
1772 #ifndef ZERO
1773 #ifdef _LP64
1774 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1775 if (!UseCompressedOops) {
1776 if (UseCompressedClassPointers) {
1777 warning("UseCompressedClassPointers requires UseCompressedOops");
1778 }
1779 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1780 } else {
1781 // Turn on UseCompressedClassPointers too
1782 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1783 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1784 }
1785 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1786 if (UseCompressedClassPointers) {
1787 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1788 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1789 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1790 }
1791 }
1792 }
1793 #endif // _LP64
1794 #endif // !ZERO
1795 }
1796
1797 void Arguments::set_conservative_max_heap_alignment() {
1798 // The conservative maximum required alignment for the heap is the maximum of
1799 // the alignments imposed by several sources: any requirements from the heap
1800 // itself, the collector policy and the maximum page size we may run the VM
1801 // with.
1802 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1803 #if INCLUDE_ALL_GCS
1804 if (UseParallelGC) {
1805 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1806 } else if (UseG1GC) {
1807 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1808 }
1809 #endif // INCLUDE_ALL_GCS
1810 _conservative_max_heap_alignment = MAX4(heap_alignment,
1811 (size_t)os::vm_allocation_granularity(),
1812 os::max_page_size(),
1813 CollectorPolicy::compute_heap_alignment());
1814 }
1815
1816 void Arguments::select_gc_ergonomically() {
1817 if (os::is_server_class_machine()) {
1818 if (should_auto_select_low_pause_collector()) {
1819 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1820 } else {
1821 #if defined(JAVASE_EMBEDDED)
1822 FLAG_SET_ERGO(bool, UseParallelGC, true);
1823 #else
1824 FLAG_SET_ERGO(bool, UseG1GC, true);
1825 #endif
1826 }
1827 } else {
1828 FLAG_SET_ERGO(bool, UseSerialGC, true);
1829 }
1830 }
1831
1832 void Arguments::select_gc() {
1833 if (!gc_selected()) {
1834 select_gc_ergonomically();
1835 guarantee(gc_selected(), "No GC selected");
1836 }
1837 }
1838
1839 void Arguments::set_ergonomics_flags() {
1840 select_gc();
1841
1842 #if defined(COMPILER2) || INCLUDE_JVMCI
1843 // Shared spaces work fine with other GCs but causes bytecode rewriting
1844 // to be disabled, which hurts interpreter performance and decreases
1845 // server performance. When -server is specified, keep the default off
1846 // unless it is asked for. Future work: either add bytecode rewriting
1847 // at link time, or rewrite bytecodes in non-shared methods.
1848 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1849 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1850 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1851 }
1852 #endif
1853
1854 set_conservative_max_heap_alignment();
1855
1856 #ifndef ZERO
1857 #ifdef _LP64
1858 set_use_compressed_oops();
1859
1860 // set_use_compressed_klass_ptrs() must be called after calling
1861 // set_use_compressed_oops().
1862 set_use_compressed_klass_ptrs();
1863
1864 // Also checks that certain machines are slower with compressed oops
1865 // in vm_version initialization code.
1866 #endif // _LP64
1867 #endif // !ZERO
1868
1869 CodeCacheExtensions::set_ergonomics_flags();
1870 }
1871
1872 void Arguments::set_parallel_gc_flags() {
1873 assert(UseParallelGC || UseParallelOldGC, "Error");
1874 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1875 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1876 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1877 }
1878 FLAG_SET_DEFAULT(UseParallelGC, true);
1879
1880 // If no heap maximum was requested explicitly, use some reasonable fraction
1881 // of the physical memory, up to a maximum of 1GB.
1882 FLAG_SET_DEFAULT(ParallelGCThreads,
1883 Abstract_VM_Version::parallel_worker_threads());
1884 if (ParallelGCThreads == 0) {
1885 jio_fprintf(defaultStream::error_stream(),
1886 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1887 vm_exit(1);
1888 }
1889
1890 if (UseAdaptiveSizePolicy) {
1891 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1892 // unless the user actually sets these flags.
1893 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1894 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1895 }
1896 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1897 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1898 }
1899 }
1900
1901 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1902 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1903 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1904 // See CR 6362902 for details.
1905 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1906 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1907 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1908 }
1909 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1910 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1911 }
1912 }
1913
1914 if (UseParallelOldGC) {
1915 // Par compact uses lower default values since they are treated as
1916 // minimums. These are different defaults because of the different
1917 // interpretation and are not ergonomically set.
1918 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1919 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1920 }
1921 }
1922 }
1923
1924 void Arguments::set_g1_gc_flags() {
1925 assert(UseG1GC, "Error");
1926 #if defined(COMPILER1) || INCLUDE_JVMCI
1927 FastTLABRefill = false;
1928 #endif
1929 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1930 if (ParallelGCThreads == 0) {
1931 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1932 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1933 }
1934
1935 #if INCLUDE_ALL_GCS
1936 if (G1ConcRefinementThreads == 0) {
1937 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1938 }
1939 #endif
1940
1941 // MarkStackSize will be set (if it hasn't been set by the user)
1942 // when concurrent marking is initialized.
1943 // Its value will be based upon the number of parallel marking threads.
1944 // But we do set the maximum mark stack size here.
1945 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1946 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1947 }
1948
1949 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1950 // In G1, we want the default GC overhead goal to be higher than
1951 // say in PS. So we set it here to 10%. Otherwise the heap might
1952 // be expanded more aggressively than we would like it to. In
1953 // fact, even 10% seems to not be high enough in some cases
1954 // (especially small GC stress tests that the main thing they do
1955 // is allocation). We might consider increase it further.
1956 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1957 }
1958
1959 if (PrintGCDetails && Verbose) {
1960 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1961 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1962 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1963 }
1964 }
1965
1966 #if !INCLUDE_ALL_GCS
1967 #ifdef ASSERT
1968 static bool verify_serial_gc_flags() {
1969 return (UseSerialGC &&
1970 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1971 UseParallelGC || UseParallelOldGC));
1972 }
1973 #endif // ASSERT
1974 #endif // INCLUDE_ALL_GCS
1975
1976 void Arguments::set_gc_specific_flags() {
1977 #if INCLUDE_ALL_GCS
1978 // Set per-collector flags
1979 if (UseParallelGC || UseParallelOldGC) {
1980 set_parallel_gc_flags();
1981 } else if (UseConcMarkSweepGC) {
1982 set_cms_and_parnew_gc_flags();
1983 } else if (UseG1GC) {
1984 set_g1_gc_flags();
1985 }
1986 if (AssumeMP && !UseSerialGC) {
1987 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1988 warning("If the number of processors is expected to increase from one, then"
1989 " you should configure the number of parallel GC threads appropriately"
1990 " using -XX:ParallelGCThreads=N");
1991 }
1992 }
1993 if (MinHeapFreeRatio == 100) {
1994 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1995 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1996 }
1997 #else // INCLUDE_ALL_GCS
1998 assert(verify_serial_gc_flags(), "SerialGC unset");
1999 #endif // INCLUDE_ALL_GCS
2000 }
2001
2002 julong Arguments::limit_by_allocatable_memory(julong limit) {
2003 julong max_allocatable;
2004 julong result = limit;
2005 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2006 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2007 }
2008 return result;
2009 }
2010
2011 // Use static initialization to get the default before parsing
2012 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2013
2014 void Arguments::set_heap_size() {
2015 const julong phys_mem =
2016 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2017 : (julong)MaxRAM;
2018
2019 // If the maximum heap size has not been set with -Xmx,
2020 // then set it as fraction of the size of physical memory,
2021 // respecting the maximum and minimum sizes of the heap.
2022 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2023 julong reasonable_max = phys_mem / MaxRAMFraction;
2024
2025 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2026 // Small physical memory, so use a minimum fraction of it for the heap
2027 reasonable_max = phys_mem / MinRAMFraction;
2028 } else {
2029 // Not-small physical memory, so require a heap at least
2030 // as large as MaxHeapSize
2031 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2032 }
2033 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2034 // Limit the heap size to ErgoHeapSizeLimit
2035 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2036 }
2037 if (UseCompressedOops) {
2038 // Limit the heap size to the maximum possible when using compressed oops
2039 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2040
2041 // HeapBaseMinAddress can be greater than default but not less than.
2042 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2043 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2044 // matches compressed oops printing flags
2045 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2046 jio_fprintf(defaultStream::error_stream(),
2047 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2048 " (" SIZE_FORMAT "G) which is greater than value given "
2049 SIZE_FORMAT "\n",
2050 DefaultHeapBaseMinAddress,
2051 DefaultHeapBaseMinAddress/G,
2052 HeapBaseMinAddress);
2053 }
2054 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2055 }
2056 }
2057
2058 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2059 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2060 // but it should be not less than default MaxHeapSize.
2061 max_coop_heap -= HeapBaseMinAddress;
2062 }
2063 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2064 }
2065 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2066
2067 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2068 // An initial heap size was specified on the command line,
2069 // so be sure that the maximum size is consistent. Done
2070 // after call to limit_by_allocatable_memory because that
2071 // method might reduce the allocation size.
2072 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2073 }
2074
2075 if (PrintGCDetails && Verbose) {
2076 // Cannot use gclog_or_tty yet.
2077 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2078 }
2079 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2080 }
2081
2082 // If the minimum or initial heap_size have not been set or requested to be set
2083 // ergonomically, set them accordingly.
2084 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2085 julong reasonable_minimum = (julong)(OldSize + NewSize);
2086
2087 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2088
2089 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2090
2091 if (InitialHeapSize == 0) {
2092 julong reasonable_initial = phys_mem / InitialRAMFraction;
2093
2094 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2095 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2096
2097 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2098
2099 if (PrintGCDetails && Verbose) {
2100 // Cannot use gclog_or_tty yet.
2101 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2102 }
2103 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2104 }
2105 // If the minimum heap size has not been set (via -Xms),
2106 // synchronize with InitialHeapSize to avoid errors with the default value.
2107 if (min_heap_size() == 0) {
2108 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2109 if (PrintGCDetails && Verbose) {
2110 // Cannot use gclog_or_tty yet.
2111 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2112 }
2113 }
2114 }
2115 }
2116
2117 // This option inspects the machine and attempts to set various
2118 // parameters to be optimal for long-running, memory allocation
2119 // intensive jobs. It is intended for machines with large
2120 // amounts of cpu and memory.
2121 jint Arguments::set_aggressive_heap_flags() {
2122 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2123 // VM, but we may not be able to represent the total physical memory
2124 // available (like having 8gb of memory on a box but using a 32bit VM).
2125 // Thus, we need to make sure we're using a julong for intermediate
2126 // calculations.
2127 julong initHeapSize;
2128 julong total_memory = os::physical_memory();
2129
2130 if (total_memory < (julong) 256 * M) {
2131 jio_fprintf(defaultStream::error_stream(),
2132 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2133 vm_exit(1);
2134 }
2135
2136 // The heap size is half of available memory, or (at most)
2137 // all of possible memory less 160mb (leaving room for the OS
2138 // when using ISM). This is the maximum; because adaptive sizing
2139 // is turned on below, the actual space used may be smaller.
2140
2141 initHeapSize = MIN2(total_memory / (julong) 2,
2142 total_memory - (julong) 160 * M);
2143
2144 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2145
2146 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2147 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2148 return JNI_EINVAL;
2149 }
2150 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2151 return JNI_EINVAL;
2152 }
2153 // Currently the minimum size and the initial heap sizes are the same.
2154 set_min_heap_size(initHeapSize);
2155 }
2156 if (FLAG_IS_DEFAULT(NewSize)) {
2157 // Make the young generation 3/8ths of the total heap.
2158 if (FLAG_SET_CMDLINE(size_t, NewSize,
2159 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2160 return JNI_EINVAL;
2161 }
2162 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2163 return JNI_EINVAL;
2164 }
2165 }
2166
2167 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2168 FLAG_SET_DEFAULT(UseLargePages, true);
2169 #endif
2170
2171 // Increase some data structure sizes for efficiency
2172 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2173 return JNI_EINVAL;
2174 }
2175 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2176 return JNI_EINVAL;
2177 }
2178 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2179 return JNI_EINVAL;
2180 }
2181
2182 // See the OldPLABSize comment below, but replace 'after promotion'
2183 // with 'after copying'. YoungPLABSize is the size of the survivor
2184 // space per-gc-thread buffers. The default is 4kw.
2185 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2186 return JNI_EINVAL;
2187 }
2188
2189 // OldPLABSize is the size of the buffers in the old gen that
2190 // UseParallelGC uses to promote live data that doesn't fit in the
2191 // survivor spaces. At any given time, there's one for each gc thread.
2192 // The default size is 1kw. These buffers are rarely used, since the
2193 // survivor spaces are usually big enough. For specjbb, however, there
2194 // are occasions when there's lots of live data in the young gen
2195 // and we end up promoting some of it. We don't have a definite
2196 // explanation for why bumping OldPLABSize helps, but the theory
2197 // is that a bigger PLAB results in retaining something like the
2198 // original allocation order after promotion, which improves mutator
2199 // locality. A minor effect may be that larger PLABs reduce the
2200 // number of PLAB allocation events during gc. The value of 8kw
2201 // was arrived at by experimenting with specjbb.
2202 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2203 return JNI_EINVAL;
2204 }
2205
2206 // Enable parallel GC and adaptive generation sizing
2207 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2208 return JNI_EINVAL;
2209 }
2210 FLAG_SET_DEFAULT(ParallelGCThreads,
2211 Abstract_VM_Version::parallel_worker_threads());
2212
2213 // Encourage steady state memory management
2214 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2215 return JNI_EINVAL;
2216 }
2217
2218 // This appears to improve mutator locality
2219 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2220 return JNI_EINVAL;
2221 }
2222
2223 // Get around early Solaris scheduling bug
2224 // (affinity vs other jobs on system)
2225 // but disallow DR and offlining (5008695).
2226 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2227 return JNI_EINVAL;
2228 }
2229
2230 return JNI_OK;
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 jint 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 if (!add_property(buffer)) {
2269 return JNI_ENOMEM;
2270 }
2271 }
2272 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2273 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2274 }
2275 #endif
2276
2277 if (AggressiveOpts) {
2278 // Sample flag setting code
2279 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2280 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2281 // }
2282 }
2283
2284 return JNI_OK;
2285 }
2286
2287 //===========================================================================================================
2288 // Parsing of java.compiler property
2289
2290 void Arguments::process_java_compiler_argument(const char* arg) {
2291 // For backwards compatibility, Djava.compiler=NONE or ""
2292 // causes us to switch to -Xint mode UNLESS -Xdebug
2293 // is also specified.
2294 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2295 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2296 }
2297 }
2298
2299 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2300 _sun_java_launcher = os::strdup_check_oom(launcher);
2301 }
2302
2303 bool Arguments::created_by_java_launcher() {
2304 assert(_sun_java_launcher != NULL, "property must have value");
2305 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2306 }
2307
2308 bool Arguments::sun_java_launcher_is_altjvm() {
2309 return _sun_java_launcher_is_altjvm;
2310 }
2311
2312 //===========================================================================================================
2313 // Parsing of main arguments
2314
2315 // check if do gclog rotation
2316 // +UseGCLogFileRotation is a must,
2317 // no gc log rotation when log file not supplied or
2318 // NumberOfGCLogFiles is 0
2319 void check_gclog_consistency() {
2320 if (UseGCLogFileRotation) {
2321 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2322 jio_fprintf(defaultStream::output_stream(),
2323 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2324 "where num_of_file > 0\n"
2325 "GC log rotation is turned off\n");
2326 UseGCLogFileRotation = false;
2327 }
2328 }
2329
2330 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2331 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
2332 jio_fprintf(defaultStream::output_stream(),
2333 "GCLogFileSize changed to minimum 8K\n");
2334 }
2335 }
2336 }
2337
2338 // This function is called for -Xloggc:<filename>, it can be used
2339 // to check if a given file name(or string) conforms to the following
2340 // specification:
2341 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2342 // %p and %t only allowed once. We only limit usage of filename not path
2343 bool is_filename_valid(const char *file_name) {
2344 const char* p = file_name;
2345 char file_sep = os::file_separator()[0];
2346 const char* cp;
2347 // skip prefix path
2348 for (cp = file_name; *cp != '\0'; cp++) {
2349 if (*cp == '/' || *cp == file_sep) {
2350 p = cp + 1;
2351 }
2352 }
2353
2354 int count_p = 0;
2355 int count_t = 0;
2356 while (*p != '\0') {
2357 if ((*p >= '0' && *p <= '9') ||
2358 (*p >= 'A' && *p <= 'Z') ||
2359 (*p >= 'a' && *p <= 'z') ||
2360 *p == '-' ||
2361 *p == '_' ||
2362 *p == '.') {
2363 p++;
2364 continue;
2365 }
2366 if (*p == '%') {
2367 if(*(p + 1) == 'p') {
2368 p += 2;
2369 count_p ++;
2370 continue;
2371 }
2372 if (*(p + 1) == 't') {
2373 p += 2;
2374 count_t ++;
2375 continue;
2376 }
2377 }
2378 return false;
2379 }
2380 return count_p < 2 && count_t < 2;
2381 }
2382
2383 // Check consistency of GC selection
2384 bool Arguments::check_gc_consistency() {
2385 check_gclog_consistency();
2386 // Ensure that the user has not selected conflicting sets
2387 // of collectors.
2388 uint i = 0;
2389 if (UseSerialGC) i++;
2390 if (UseConcMarkSweepGC) i++;
2391 if (UseParallelGC || UseParallelOldGC) i++;
2392 if (UseG1GC) i++;
2393 if (i > 1) {
2394 jio_fprintf(defaultStream::error_stream(),
2395 "Conflicting collector combinations in option list; "
2396 "please refer to the release notes for the combinations "
2397 "allowed\n");
2398 return false;
2399 }
2400
2401 if (UseConcMarkSweepGC && !UseParNewGC) {
2402 jio_fprintf(defaultStream::error_stream(),
2403 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2404 return false;
2405 }
2406
2407 if (UseParNewGC && !UseConcMarkSweepGC) {
2408 jio_fprintf(defaultStream::error_stream(),
2409 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2410 return false;
2411 }
2412
2413 return true;
2414 }
2415
2416 // Check the consistency of vm_init_args
2417 bool Arguments::check_vm_args_consistency() {
2418 // Method for adding checks for flag consistency.
2419 // The intent is to warn the user of all possible conflicts,
2420 // before returning an error.
2421 // Note: Needs platform-dependent factoring.
2422 bool status = true;
2423
2424 if (TLABRefillWasteFraction == 0) {
2425 jio_fprintf(defaultStream::error_stream(),
2426 "TLABRefillWasteFraction should be a denominator, "
2427 "not " SIZE_FORMAT "\n",
2428 TLABRefillWasteFraction);
2429 status = false;
2430 }
2431
2432 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2433 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2434 }
2435
2436 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2437 // Settings to encourage splitting.
2438 if (!FLAG_IS_CMDLINE(NewRatio)) {
2439 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2440 status = false;
2441 }
2442 }
2443 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2444 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2445 status = false;
2446 }
2447 }
2448 }
2449
2450 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2451 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2452 }
2453
2454 if (GCTimeLimit == 100) {
2455 // Turn off gc-overhead-limit-exceeded checks
2456 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2457 }
2458
2459 status = status && check_gc_consistency();
2460
2461 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2462 // insists that we hold the requisite locks so that the iteration is
2463 // MT-safe. For the verification at start-up and shut-down, we don't
2464 // yet have a good way of acquiring and releasing these locks,
2465 // which are not visible at the CollectedHeap level. We want to
2466 // be able to acquire these locks and then do the iteration rather
2467 // than just disable the lock verification. This will be fixed under
2468 // bug 4788986.
2469 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2470 if (VerifyDuringStartup) {
2471 warning("Heap verification at start-up disabled "
2472 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2473 VerifyDuringStartup = false; // Disable verification at start-up
2474 }
2475
2476 if (VerifyBeforeExit) {
2477 warning("Heap verification at shutdown disabled "
2478 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2479 VerifyBeforeExit = false; // Disable verification at shutdown
2480 }
2481 }
2482
2483 // Note: only executed in non-PRODUCT mode
2484 if (!UseAsyncConcMarkSweepGC &&
2485 (ExplicitGCInvokesConcurrent ||
2486 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2487 jio_fprintf(defaultStream::error_stream(),
2488 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2489 " with -UseAsyncConcMarkSweepGC");
2490 status = false;
2491 }
2492
2493 if (PrintNMTStatistics) {
2494 #if INCLUDE_NMT
2495 if (MemTracker::tracking_level() == NMT_off) {
2496 #endif // INCLUDE_NMT
2497 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2498 PrintNMTStatistics = false;
2499 #if INCLUDE_NMT
2500 }
2501 #endif
2502 }
2503 #if INCLUDE_JVMCI
2504 if (EnableJVMCI) {
2505 if (!ScavengeRootsInCode) {
2506 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2507 ScavengeRootsInCode = 1;
2508 }
2509 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2510 TypeProfileLevel = 0;
2511 }
2512 if (UseJVMCICompiler) {
2513 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2514 TypeProfileWidth = 8;
2515 }
2516 }
2517 }
2518 #endif
2519
2520 // Check lower bounds of the code cache
2521 // Template Interpreter code is approximately 3X larger in debug builds.
2522 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2523 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2524 jio_fprintf(defaultStream::error_stream(),
2525 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2526 os::vm_page_size()/K);
2527 status = false;
2528 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2529 jio_fprintf(defaultStream::error_stream(),
2530 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2531 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2532 status = false;
2533 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2534 jio_fprintf(defaultStream::error_stream(),
2535 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2536 min_code_cache_size/K);
2537 status = false;
2538 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2539 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2540 jio_fprintf(defaultStream::error_stream(),
2541 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2542 CODE_CACHE_SIZE_LIMIT/M);
2543 status = false;
2544 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2545 jio_fprintf(defaultStream::error_stream(),
2546 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2547 min_code_cache_size/K);
2548 status = false;
2549 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2550 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2551 jio_fprintf(defaultStream::error_stream(),
2552 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2553 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2554 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2555 status = false;
2556 }
2557
2558 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2559 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2560 }
2561
2562 return status;
2563 }
2564
2565 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2566 const char* option_type) {
2567 if (ignore) return false;
2568
2569 const char* spacer = " ";
2570 if (option_type == NULL) {
2571 option_type = ++spacer; // Set both to the empty string.
2572 }
2573
2574 if (os::obsolete_option(option)) {
2575 jio_fprintf(defaultStream::error_stream(),
2576 "Obsolete %s%soption: %s\n", option_type, spacer,
2577 option->optionString);
2578 return false;
2579 } else {
2580 jio_fprintf(defaultStream::error_stream(),
2581 "Unrecognized %s%soption: %s\n", option_type, spacer,
2582 option->optionString);
2583 return true;
2584 }
2585 }
2586
2587 static const char* user_assertion_options[] = {
2588 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2589 };
2590
2591 static const char* system_assertion_options[] = {
2592 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2593 };
2594
2595 bool Arguments::parse_uintx(const char* value,
2596 uintx* uintx_arg,
2597 uintx min_size) {
2598
2599 // Check the sign first since atomull() parses only unsigned values.
2600 bool value_is_positive = !(*value == '-');
2601
2602 if (value_is_positive) {
2603 julong n;
2604 bool good_return = atomull(value, &n);
2605 if (good_return) {
2606 bool above_minimum = n >= min_size;
2607 bool value_is_too_large = n > max_uintx;
2608
2609 if (above_minimum && !value_is_too_large) {
2610 *uintx_arg = n;
2611 return true;
2612 }
2613 }
2614 }
2615 return false;
2616 }
2617
2618 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2619 julong* long_arg,
2620 julong min_size) {
2621 if (!atomull(s, long_arg)) return arg_unreadable;
2622 return check_memory_size(*long_arg, min_size);
2623 }
2624
2625 // Parse JavaVMInitArgs structure
2626
2627 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2628 const JavaVMInitArgs *java_options_args,
2629 const JavaVMInitArgs *cmd_line_args) {
2630 // For components of the system classpath.
2631 SysClassPath scp(Arguments::get_sysclasspath());
2632 bool scp_assembly_required = false;
2633
2634 // Save default settings for some mode flags
2635 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2636 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2637 Arguments::_ClipInlining = ClipInlining;
2638 Arguments::_BackgroundCompilation = BackgroundCompilation;
2639 if (TieredCompilation) {
2640 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2641 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2642 }
2643
2644 // Setup flags for mixed which is the default
2645 set_mode_flags(_mixed);
2646
2647 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2648 // variable (if present).
2649 jint result = parse_each_vm_init_arg(
2650 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2651 if (result != JNI_OK) {
2652 return result;
2653 }
2654
2655 // Parse args structure generated from the command line flags.
2656 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2657 Flag::COMMAND_LINE);
2658 if (result != JNI_OK) {
2659 return result;
2660 }
2661
2662 // Parse args structure generated from the _JAVA_OPTIONS environment
2663 // variable (if present) (mimics classic VM)
2664 result = parse_each_vm_init_arg(
2665 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2666 if (result != JNI_OK) {
2667 return result;
2668 }
2669
2670 // Do final processing now that all arguments have been parsed
2671 result = finalize_vm_init_args(&scp, scp_assembly_required);
2672 if (result != JNI_OK) {
2673 return result;
2674 }
2675
2676 return JNI_OK;
2677 }
2678
2679 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2680 // represents a valid JDWP agent. is_path==true denotes that we
2681 // are dealing with -agentpath (case where name is a path), otherwise with
2682 // -agentlib
2683 bool valid_jdwp_agent(char *name, bool is_path) {
2684 char *_name;
2685 const char *_jdwp = "jdwp";
2686 size_t _len_jdwp, _len_prefix;
2687
2688 if (is_path) {
2689 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2690 return false;
2691 }
2692
2693 _name++; // skip past last path separator
2694 _len_prefix = strlen(JNI_LIB_PREFIX);
2695
2696 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2697 return false;
2698 }
2699
2700 _name += _len_prefix;
2701 _len_jdwp = strlen(_jdwp);
2702
2703 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2704 _name += _len_jdwp;
2705 }
2706 else {
2707 return false;
2708 }
2709
2710 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2711 return false;
2712 }
2713
2714 return true;
2715 }
2716
2717 if (strcmp(name, _jdwp) == 0) {
2718 return true;
2719 }
2720
2721 return false;
2722 }
2723
2724 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2725 SysClassPath* scp_p,
2726 bool* scp_assembly_required_p,
2727 Flag::Flags origin) {
2728 // Remaining part of option string
2729 const char* tail;
2730
2731 // iterate over arguments
2732 for (int index = 0; index < args->nOptions; index++) {
2733 bool is_absolute_path = false; // for -agentpath vs -agentlib
2734
2735 const JavaVMOption* option = args->options + index;
2736
2737 if (!match_option(option, "-Djava.class.path", &tail) &&
2738 !match_option(option, "-Dsun.java.command", &tail) &&
2739 !match_option(option, "-Dsun.java.launcher", &tail)) {
2740
2741 // add all jvm options to the jvm_args string. This string
2742 // is used later to set the java.vm.args PerfData string constant.
2743 // the -Djava.class.path and the -Dsun.java.command options are
2744 // omitted from jvm_args string as each have their own PerfData
2745 // string constant object.
2746 build_jvm_args(option->optionString);
2747 }
2748
2749 // -verbose:[class/gc/jni]
2750 if (match_option(option, "-verbose", &tail)) {
2751 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2752 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2756 return JNI_EINVAL;
2757 }
2758 } else if (!strcmp(tail, ":gc")) {
2759 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 } else if (!strcmp(tail, ":jni")) {
2763 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 }
2767 // -da / -ea / -disableassertions / -enableassertions
2768 // These accept an optional class/package name separated by a colon, e.g.,
2769 // -da:java.lang.Thread.
2770 } else if (match_option(option, user_assertion_options, &tail, true)) {
2771 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2772 if (*tail == '\0') {
2773 JavaAssertions::setUserClassDefault(enable);
2774 } else {
2775 assert(*tail == ':', "bogus match by match_option()");
2776 JavaAssertions::addOption(tail + 1, enable);
2777 }
2778 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2779 } else if (match_option(option, system_assertion_options, &tail, false)) {
2780 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2781 JavaAssertions::setSystemClassDefault(enable);
2782 // -bootclasspath:
2783 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2784 scp_p->reset_path(tail);
2785 *scp_assembly_required_p = true;
2786 // -bootclasspath/a:
2787 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2788 scp_p->add_suffix(tail);
2789 *scp_assembly_required_p = true;
2790 // -bootclasspath/p:
2791 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2792 scp_p->add_prefix(tail);
2793 *scp_assembly_required_p = true;
2794 // -Xrun
2795 } else if (match_option(option, "-Xrun", &tail)) {
2796 if (tail != NULL) {
2797 const char* pos = strchr(tail, ':');
2798 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2799 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2800 name[len] = '\0';
2801
2802 char *options = NULL;
2803 if(pos != NULL) {
2804 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2805 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2806 }
2807 #if !INCLUDE_JVMTI
2808 if (strcmp(name, "jdwp") == 0) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Debugging agents are not supported in this VM\n");
2811 return JNI_ERR;
2812 }
2813 #endif // !INCLUDE_JVMTI
2814 add_init_library(name, options);
2815 }
2816 // -agentlib and -agentpath
2817 } else if (match_option(option, "-agentlib:", &tail) ||
2818 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2819 if(tail != NULL) {
2820 const char* pos = strchr(tail, '=');
2821 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2822 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2823 name[len] = '\0';
2824
2825 char *options = NULL;
2826 if(pos != NULL) {
2827 options = os::strdup_check_oom(pos + 1, mtInternal);
2828 }
2829 #if !INCLUDE_JVMTI
2830 if (valid_jdwp_agent(name, is_absolute_path)) {
2831 jio_fprintf(defaultStream::error_stream(),
2832 "Debugging agents are not supported in this VM\n");
2833 return JNI_ERR;
2834 }
2835 #endif // !INCLUDE_JVMTI
2836 add_init_agent(name, options, is_absolute_path);
2837 }
2838 // -javaagent
2839 } else if (match_option(option, "-javaagent:", &tail)) {
2840 #if !INCLUDE_JVMTI
2841 jio_fprintf(defaultStream::error_stream(),
2842 "Instrumentation agents are not supported in this VM\n");
2843 return JNI_ERR;
2844 #else
2845 if(tail != NULL) {
2846 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2847 add_init_agent("instrument", options, false);
2848 }
2849 #endif // !INCLUDE_JVMTI
2850 // -Xnoclassgc
2851 } else if (match_option(option, "-Xnoclassgc")) {
2852 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2853 return JNI_EINVAL;
2854 }
2855 // -Xconcgc
2856 } else if (match_option(option, "-Xconcgc")) {
2857 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2858 return JNI_EINVAL;
2859 }
2860 // -Xnoconcgc
2861 } else if (match_option(option, "-Xnoconcgc")) {
2862 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 // -Xbatch
2866 } else if (match_option(option, "-Xbatch")) {
2867 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 // -Xmn for compatibility with other JVM vendors
2871 } else if (match_option(option, "-Xmn", &tail)) {
2872 julong long_initial_young_size = 0;
2873 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2874 if (errcode != arg_in_range) {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Invalid initial young generation size: %s\n", option->optionString);
2877 describe_range_error(errcode);
2878 return JNI_EINVAL;
2879 }
2880 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2881 return JNI_EINVAL;
2882 }
2883 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2884 return JNI_EINVAL;
2885 }
2886 // -Xms
2887 } else if (match_option(option, "-Xms", &tail)) {
2888 julong long_initial_heap_size = 0;
2889 // an initial heap size of 0 means automatically determine
2890 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2891 if (errcode != arg_in_range) {
2892 jio_fprintf(defaultStream::error_stream(),
2893 "Invalid initial heap size: %s\n", option->optionString);
2894 describe_range_error(errcode);
2895 return JNI_EINVAL;
2896 }
2897 set_min_heap_size((size_t)long_initial_heap_size);
2898 // Currently the minimum size and the initial heap sizes are the same.
2899 // Can be overridden with -XX:InitialHeapSize.
2900 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 // -Xmx
2904 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2905 julong long_max_heap_size = 0;
2906 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2907 if (errcode != arg_in_range) {
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Invalid maximum heap size: %s\n", option->optionString);
2910 describe_range_error(errcode);
2911 return JNI_EINVAL;
2912 }
2913 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 // Xmaxf
2917 } else if (match_option(option, "-Xmaxf", &tail)) {
2918 char* err;
2919 int maxf = (int)(strtod(tail, &err) * 100);
2920 if (*err != '\0' || *tail == '\0') {
2921 jio_fprintf(defaultStream::error_stream(),
2922 "Bad max heap free percentage size: %s\n",
2923 option->optionString);
2924 return JNI_EINVAL;
2925 } else {
2926 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 }
2930 // Xminf
2931 } else if (match_option(option, "-Xminf", &tail)) {
2932 char* err;
2933 int minf = (int)(strtod(tail, &err) * 100);
2934 if (*err != '\0' || *tail == '\0') {
2935 jio_fprintf(defaultStream::error_stream(),
2936 "Bad min heap free percentage size: %s\n",
2937 option->optionString);
2938 return JNI_EINVAL;
2939 } else {
2940 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 }
2944 // -Xss
2945 } else if (match_option(option, "-Xss", &tail)) {
2946 julong long_ThreadStackSize = 0;
2947 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2948 if (errcode != arg_in_range) {
2949 jio_fprintf(defaultStream::error_stream(),
2950 "Invalid thread stack size: %s\n", option->optionString);
2951 describe_range_error(errcode);
2952 return JNI_EINVAL;
2953 }
2954 // Internally track ThreadStackSize in units of 1024 bytes.
2955 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2956 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2957 return JNI_EINVAL;
2958 }
2959 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2960 } else if (match_option(option, "-Xoss", &tail) ||
2961 match_option(option, "-Xsqnopause") ||
2962 match_option(option, "-Xoptimize") ||
2963 match_option(option, "-Xboundthreads")) {
2964 // All these options are deprecated in JDK 9 and will be removed in a future release
2965 char version[256];
2966 JDK_Version::jdk(9).to_string(version, sizeof(version));
2967 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2968 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2969 julong long_CodeCacheExpansionSize = 0;
2970 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2971 if (errcode != arg_in_range) {
2972 jio_fprintf(defaultStream::error_stream(),
2973 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2974 os::vm_page_size()/K);
2975 return JNI_EINVAL;
2976 }
2977 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2978 return JNI_EINVAL;
2979 }
2980 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2981 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2982 julong long_ReservedCodeCacheSize = 0;
2983
2984 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2985 if (errcode != arg_in_range) {
2986 jio_fprintf(defaultStream::error_stream(),
2987 "Invalid maximum code cache size: %s.\n", option->optionString);
2988 return JNI_EINVAL;
2989 }
2990 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2991 return JNI_EINVAL;
2992 }
2993 // -XX:NonNMethodCodeHeapSize=
2994 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2995 julong long_NonNMethodCodeHeapSize = 0;
2996
2997 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2998 if (errcode != arg_in_range) {
2999 jio_fprintf(defaultStream::error_stream(),
3000 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3001 return JNI_EINVAL;
3002 }
3003 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 // -XX:ProfiledCodeHeapSize=
3007 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3008 julong long_ProfiledCodeHeapSize = 0;
3009
3010 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3011 if (errcode != arg_in_range) {
3012 jio_fprintf(defaultStream::error_stream(),
3013 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3014 return JNI_EINVAL;
3015 }
3016 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3017 return JNI_EINVAL;
3018 }
3019 // -XX:NonProfiledCodeHeapSizee=
3020 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3021 julong long_NonProfiledCodeHeapSize = 0;
3022
3023 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3024 if (errcode != arg_in_range) {
3025 jio_fprintf(defaultStream::error_stream(),
3026 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3027 return JNI_EINVAL;
3028 }
3029 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3030 return JNI_EINVAL;
3031 }
3032 // -green
3033 } else if (match_option(option, "-green")) {
3034 jio_fprintf(defaultStream::error_stream(),
3035 "Green threads support not available\n");
3036 return JNI_EINVAL;
3037 // -native
3038 } else if (match_option(option, "-native")) {
3039 // HotSpot always uses native threads, ignore silently for compatibility
3040 // -Xrs
3041 } else if (match_option(option, "-Xrs")) {
3042 // Classic/EVM option, new functionality
3043 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3044 return JNI_EINVAL;
3045 }
3046 } else if (match_option(option, "-Xusealtsigs")) {
3047 // change default internal VM signals used - lower case for back compat
3048 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
3049 return JNI_EINVAL;
3050 }
3051 // -Xprof
3052 } else if (match_option(option, "-Xprof")) {
3053 #if INCLUDE_FPROF
3054 _has_profile = true;
3055 #else // INCLUDE_FPROF
3056 jio_fprintf(defaultStream::error_stream(),
3057 "Flat profiling is not supported in this VM.\n");
3058 return JNI_ERR;
3059 #endif // INCLUDE_FPROF
3060 // -Xconcurrentio
3061 } else if (match_option(option, "-Xconcurrentio")) {
3062 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3063 return JNI_EINVAL;
3064 }
3065 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3069 return JNI_EINVAL;
3070 }
3071 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3075 return JNI_EINVAL;
3076 }
3077
3078 // -Xinternalversion
3079 } else if (match_option(option, "-Xinternalversion")) {
3080 jio_fprintf(defaultStream::output_stream(), "%s\n",
3081 VM_Version::internal_vm_info_string());
3082 vm_exit(0);
3083 #ifndef PRODUCT
3084 // -Xprintflags
3085 } else if (match_option(option, "-Xprintflags")) {
3086 CommandLineFlags::printFlags(tty, false);
3087 vm_exit(0);
3088 #endif
3089 // -D
3090 } else if (match_option(option, "-D", &tail)) {
3091 const char* value;
3092 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3093 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3094 // abort if -Djava.endorsed.dirs is set
3095 jio_fprintf(defaultStream::output_stream(),
3096 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3097 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3098 return JNI_EINVAL;
3099 }
3100 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3101 *value != '\0' && strcmp(value, "\"\"") != 0) {
3102 // abort if -Djava.ext.dirs is set
3103 jio_fprintf(defaultStream::output_stream(),
3104 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3105 return JNI_EINVAL;
3106 }
3107
3108 if (!add_property(tail)) {
3109 return JNI_ENOMEM;
3110 }
3111 // Out of the box management support
3112 if (match_option(option, "-Dcom.sun.management", &tail)) {
3113 #if INCLUDE_MANAGEMENT
3114 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3115 return JNI_EINVAL;
3116 }
3117 #else
3118 jio_fprintf(defaultStream::output_stream(),
3119 "-Dcom.sun.management is not supported in this VM.\n");
3120 return JNI_ERR;
3121 #endif
3122 }
3123 // -Xint
3124 } else if (match_option(option, "-Xint")) {
3125 set_mode_flags(_int);
3126 // -Xmixed
3127 } else if (match_option(option, "-Xmixed")) {
3128 set_mode_flags(_mixed);
3129 // -Xcomp
3130 } else if (match_option(option, "-Xcomp")) {
3131 // for testing the compiler; turn off all flags that inhibit compilation
3132 set_mode_flags(_comp);
3133 // -Xshare:dump
3134 } else if (match_option(option, "-Xshare:dump")) {
3135 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 set_mode_flags(_int); // Prevent compilation, which creates objects
3139 // -Xshare:on
3140 } else if (match_option(option, "-Xshare:on")) {
3141 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3142 return JNI_EINVAL;
3143 }
3144 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3145 return JNI_EINVAL;
3146 }
3147 // -Xshare:auto
3148 } else if (match_option(option, "-Xshare:auto")) {
3149 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 // -Xshare:off
3156 } else if (match_option(option, "-Xshare:off")) {
3157 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3158 return JNI_EINVAL;
3159 }
3160 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3161 return JNI_EINVAL;
3162 }
3163 // -Xverify
3164 } else if (match_option(option, "-Xverify", &tail)) {
3165 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3166 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3167 return JNI_EINVAL;
3168 }
3169 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3170 return JNI_EINVAL;
3171 }
3172 } else if (strcmp(tail, ":remote") == 0) {
3173 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3174 return JNI_EINVAL;
3175 }
3176 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 } else if (strcmp(tail, ":none") == 0) {
3180 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3181 return JNI_EINVAL;
3182 }
3183 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3184 return JNI_EINVAL;
3185 }
3186 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3187 return JNI_EINVAL;
3188 }
3189 // -Xdebug
3190 } else if (match_option(option, "-Xdebug")) {
3191 // note this flag has been used, then ignore
3192 set_xdebug_mode(true);
3193 // -Xnoagent
3194 } else if (match_option(option, "-Xnoagent")) {
3195 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3196 } else if (match_option(option, "-Xloggc:", &tail)) {
3197 // Redirect GC output to the file. -Xloggc:<filename>
3198 // ostream_init_log(), when called will use this filename
3199 // to initialize a fileStream.
3200 _gc_log_filename = os::strdup_check_oom(tail);
3201 if (!is_filename_valid(_gc_log_filename)) {
3202 jio_fprintf(defaultStream::output_stream(),
3203 "Invalid file name for use with -Xloggc: Filename can only contain the "
3204 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3205 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3206 return JNI_EINVAL;
3207 }
3208 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
3212 return JNI_EINVAL;
3213 }
3214 // JNI hooks
3215 } else if (match_option(option, "-Xcheck", &tail)) {
3216 if (!strcmp(tail, ":jni")) {
3217 #if !INCLUDE_JNI_CHECK
3218 warning("JNI CHECKING is not supported in this VM");
3219 #else
3220 CheckJNICalls = true;
3221 #endif // INCLUDE_JNI_CHECK
3222 } else if (is_bad_option(option, args->ignoreUnrecognized,
3223 "check")) {
3224 return JNI_EINVAL;
3225 }
3226 } else if (match_option(option, "vfprintf")) {
3227 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3228 } else if (match_option(option, "exit")) {
3229 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3230 } else if (match_option(option, "abort")) {
3231 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3232 // -XX:+AggressiveHeap
3233 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3234 jint result = set_aggressive_heap_flags();
3235 if (result != JNI_OK) {
3236 return result;
3237 }
3238 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3239 // and the last option wins.
3240 } else if (match_option(option, "-XX:+NeverTenure")) {
3241 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3242 return JNI_EINVAL;
3243 }
3244 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3245 return JNI_EINVAL;
3246 }
3247 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3248 return JNI_EINVAL;
3249 }
3250 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3251 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3252 return JNI_EINVAL;
3253 }
3254 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3255 return JNI_EINVAL;
3256 }
3257 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3258 return JNI_EINVAL;
3259 }
3260 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3261 uintx max_tenuring_thresh = 0;
3262 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3263 jio_fprintf(defaultStream::error_stream(),
3264 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3265 return JNI_EINVAL;
3266 }
3267
3268 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3269 return JNI_EINVAL;
3270 }
3271
3272 if (MaxTenuringThreshold == 0) {
3273 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3274 return JNI_EINVAL;
3275 }
3276 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3277 return JNI_EINVAL;
3278 }
3279 } else {
3280 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3281 return JNI_EINVAL;
3282 }
3283 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3284 return JNI_EINVAL;
3285 }
3286 }
3287 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3288 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3289 return JNI_EINVAL;
3290 }
3291 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3292 return JNI_EINVAL;
3293 }
3294 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3295 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3296 return JNI_EINVAL;
3297 }
3298 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3299 return JNI_EINVAL;
3300 }
3301 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3302 #if defined(DTRACE_ENABLED)
3303 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3304 return JNI_EINVAL;
3305 }
3306 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3307 return JNI_EINVAL;
3308 }
3309 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3310 return JNI_EINVAL;
3311 }
3312 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3313 return JNI_EINVAL;
3314 }
3315 #else // defined(DTRACE_ENABLED)
3316 jio_fprintf(defaultStream::error_stream(),
3317 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3318 return JNI_EINVAL;
3319 #endif // defined(DTRACE_ENABLED)
3320 #ifdef ASSERT
3321 } else if (match_option(option, "-XX:+FullGCALot")) {
3322 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3323 return JNI_EINVAL;
3324 }
3325 // disable scavenge before parallel mark-compact
3326 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3327 return JNI_EINVAL;
3328 }
3329 #endif
3330 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3331 julong max_direct_memory_size = 0;
3332 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3333 if (errcode != arg_in_range) {
3334 jio_fprintf(defaultStream::error_stream(),
3335 "Invalid maximum direct memory size: %s\n",
3336 option->optionString);
3337 describe_range_error(errcode);
3338 return JNI_EINVAL;
3339 }
3340 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3341 return JNI_EINVAL;
3342 }
3343 #if !INCLUDE_MANAGEMENT
3344 } else if (match_option(option, "-XX:+ManagementServer")) {
3345 jio_fprintf(defaultStream::error_stream(),
3346 "ManagementServer is not supported in this VM.\n");
3347 return JNI_ERR;
3348 #endif // INCLUDE_MANAGEMENT
3349 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3350 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3351 // already been handled
3352 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3353 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3354 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3355 return JNI_EINVAL;
3356 }
3357 }
3358 // Unknown option
3359 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3360 return JNI_ERR;
3361 }
3362 }
3363
3364 // PrintSharedArchiveAndExit will turn on
3365 // -Xshare:on
3366 // -XX:+TraceClassPaths
3367 if (PrintSharedArchiveAndExit) {
3368 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3369 return JNI_EINVAL;
3370 }
3371 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3372 return JNI_EINVAL;
3373 }
3374 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3375 return JNI_EINVAL;
3376 }
3377 }
3378
3379 // Change the default value for flags which have different default values
3380 // when working with older JDKs.
3381 #ifdef LINUX
3382 if (JDK_Version::current().compare_major(6) <= 0 &&
3383 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3384 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3385 }
3386 #endif // LINUX
3387 fix_appclasspath();
3388 return JNI_OK;
3389 }
3390
3391 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3392 //
3393 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3394 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3395 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3396 // path is treated as the current directory.
3397 //
3398 // This causes problems with CDS, which requires that all directories specified in the classpath
3399 // must be empty. In most cases, applications do NOT want to load classes from the current
3400 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3401 // scripts compatible with CDS.
3402 void Arguments::fix_appclasspath() {
3403 if (IgnoreEmptyClassPaths) {
3404 const char separator = *os::path_separator();
3405 const char* src = _java_class_path->value();
3406
3407 // skip over all the leading empty paths
3408 while (*src == separator) {
3409 src ++;
3410 }
3411
3412 char* copy = os::strdup_check_oom(src, mtInternal);
3413
3414 // trim all trailing empty paths
3415 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3416 *tail = '\0';
3417 }
3418
3419 char from[3] = {separator, separator, '\0'};
3420 char to [2] = {separator, '\0'};
3421 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3422 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3423 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3424 }
3425
3426 _java_class_path->set_value(copy);
3427 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3428 }
3429
3430 if (!PrintSharedArchiveAndExit) {
3431 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3432 }
3433 }
3434
3435 static bool has_jar_files(const char* directory) {
3436 DIR* dir = os::opendir(directory);
3437 if (dir == NULL) return false;
3438
3439 struct dirent *entry;
3440 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3441 bool hasJarFile = false;
3442 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3443 const char* name = entry->d_name;
3444 const char* ext = name + strlen(name) - 4;
3445 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3446 }
3447 FREE_C_HEAP_ARRAY(char, dbuf);
3448 os::closedir(dir);
3449 return hasJarFile ;
3450 }
3451
3452 static int check_non_empty_dirs(const char* path) {
3453 const char separator = *os::path_separator();
3454 const char* const end = path + strlen(path);
3455 int nonEmptyDirs = 0;
3456 while (path < end) {
3457 const char* tmp_end = strchr(path, separator);
3458 if (tmp_end == NULL) {
3459 if (has_jar_files(path)) {
3460 nonEmptyDirs++;
3461 jio_fprintf(defaultStream::output_stream(),
3462 "Non-empty directory: %s\n", path);
3463 }
3464 path = end;
3465 } else {
3466 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3467 memcpy(dirpath, path, tmp_end - path);
3468 dirpath[tmp_end - path] = '\0';
3469 if (has_jar_files(dirpath)) {
3470 nonEmptyDirs++;
3471 jio_fprintf(defaultStream::output_stream(),
3472 "Non-empty directory: %s\n", dirpath);
3473 }
3474 FREE_C_HEAP_ARRAY(char, dirpath);
3475 path = tmp_end + 1;
3476 }
3477 }
3478 return nonEmptyDirs;
3479 }
3480
3481 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3482 // check if the default lib/endorsed directory exists; if so, error
3483 char path[JVM_MAXPATHLEN];
3484 const char* fileSep = os::file_separator();
3485 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3486
3487 #if INCLUDE_JVMCI
3488 jint res = JVMCIRuntime::save_options(_system_properties);
3489 if (res != JNI_OK) {
3490 return res;
3491 }
3492
3493 if (EnableJVMCI) {
3494 // Append lib/jvmci/*.jar to boot class path
3495 char jvmciDir[JVM_MAXPATHLEN];
3496 const char* fileSep = os::file_separator();
3497 jio_snprintf(jvmciDir, sizeof(jvmciDir), "%s%slib%sjvmci", Arguments::get_java_home(), fileSep, fileSep);
3498 DIR* dir = os::opendir(jvmciDir);
3499 if (dir != NULL) {
3500 struct dirent *entry;
3501 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(jvmciDir), mtInternal);
3502 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3503 const char* name = entry->d_name;
3504 const char* ext = name + strlen(name) - 4;
3505 if (ext > name && strcmp(ext, ".jar") == 0) {
3506 char fileName[JVM_MAXPATHLEN];
3507 jio_snprintf(fileName, sizeof(fileName), "%s%s%s", jvmciDir, fileSep, name);
3508 scp_p->add_suffix(fileName);
3509 scp_assembly_required = true;
3510 }
3511 }
3512 FREE_C_HEAP_ARRAY(char, dbuf);
3513 os::closedir(dir);
3514 }
3515 }
3516 #endif // INCLUDE_JVMCI
3517
3518 if (CheckEndorsedAndExtDirs) {
3519 int nonEmptyDirs = 0;
3520 // check endorsed directory
3521 nonEmptyDirs += check_non_empty_dirs(path);
3522 // check the extension directories
3523 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3524 if (nonEmptyDirs > 0) {
3525 return JNI_ERR;
3526 }
3527 }
3528
3529 DIR* dir = os::opendir(path);
3530 if (dir != NULL) {
3531 jio_fprintf(defaultStream::output_stream(),
3532 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3533 "in modular form will be supported via the concept of upgradeable modules.\n");
3534 os::closedir(dir);
3535 return JNI_ERR;
3536 }
3537
3538 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3539 dir = os::opendir(path);
3540 if (dir != NULL) {
3541 jio_fprintf(defaultStream::output_stream(),
3542 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3543 "Use -classpath instead.\n.");
3544 os::closedir(dir);
3545 return JNI_ERR;
3546 }
3547
3548 if (scp_assembly_required) {
3549 // Assemble the bootclasspath elements into the final path.
3550 char *combined_path = scp_p->combined_path();
3551 Arguments::set_sysclasspath(combined_path);
3552 FREE_C_HEAP_ARRAY(char, combined_path);
3553 }
3554
3555 // This must be done after all arguments have been processed.
3556 // java_compiler() true means set to "NONE" or empty.
3557 if (java_compiler() && !xdebug_mode()) {
3558 // For backwards compatibility, we switch to interpreted mode if
3559 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3560 // not specified.
3561 set_mode_flags(_int);
3562 }
3563
3564 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3565 // but like -Xint, leave compilation thresholds unaffected.
3566 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3567 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3568 set_mode_flags(_int);
3569 }
3570
3571 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3572 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3573 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3574 }
3575
3576 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3577 // Don't degrade server performance for footprint
3578 if (FLAG_IS_DEFAULT(UseLargePages) &&
3579 MaxHeapSize < LargePageHeapSizeThreshold) {
3580 // No need for large granularity pages w/small heaps.
3581 // Note that large pages are enabled/disabled for both the
3582 // Java heap and the code cache.
3583 FLAG_SET_DEFAULT(UseLargePages, false);
3584 }
3585
3586 #elif defined(COMPILER2)
3587 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3588 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3589 }
3590 #endif
3591
3592 #ifndef TIERED
3593 // Tiered compilation is undefined.
3594 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3595 #endif
3596
3597 // If we are running in a headless jre, force java.awt.headless property
3598 // to be true unless the property has already been set.
3599 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3600 if (os::is_headless_jre()) {
3601 const char* headless = Arguments::get_property("java.awt.headless");
3602 if (headless == NULL) {
3603 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3604 if (headless_env == NULL) {
3605 if (!add_property("java.awt.headless=true")) {
3606 return JNI_ENOMEM;
3607 }
3608 } else {
3609 char buffer[256];
3610 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3611 if (!add_property(buffer)) {
3612 return JNI_ENOMEM;
3613 }
3614 }
3615 }
3616 }
3617
3618 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3619 // CMS can only be used with ParNew
3620 FLAG_SET_ERGO(bool, UseParNewGC, true);
3621 }
3622
3623 if (!check_vm_args_consistency()) {
3624 return JNI_ERR;
3625 }
3626
3627 return JNI_OK;
3628 }
3629
3630 // Helper class for controlling the lifetime of JavaVMInitArgs
3631 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3632 // deleted on the destruction of the ScopedVMInitArgs object.
3633 class ScopedVMInitArgs : public StackObj {
3634 private:
3635 JavaVMInitArgs _args;
3636 bool _is_set;
3637
3638 public:
3639 ScopedVMInitArgs() {
3640 _args.version = JNI_VERSION_1_2;
3641 _args.nOptions = 0;
3642 _args.options = NULL;
3643 _args.ignoreUnrecognized = false;
3644 _is_set = false;
3645 }
3646
3647 // Populates the JavaVMInitArgs object represented by this
3648 // ScopedVMInitArgs object with the arguments in options. The
3649 // allocated memory is deleted by the destructor. If this method
3650 // returns anything other than JNI_OK, then this object is in a
3651 // partially constructed state, and should be abandoned.
3652 jint set_args(GrowableArray<JavaVMOption>* options) {
3653 _is_set = true;
3654 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3655 JavaVMOption, options->length(), mtInternal);
3656 if (options_arr == NULL) {
3657 return JNI_ENOMEM;
3658 }
3659 _args.options = options_arr;
3660
3661 for (int i = 0; i < options->length(); i++) {
3662 options_arr[i] = options->at(i);
3663 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3664 if (options_arr[i].optionString == NULL) {
3665 // Rely on the destructor to do cleanup.
3666 _args.nOptions = i;
3667 return JNI_ENOMEM;
3668 }
3669 }
3670
3671 _args.nOptions = options->length();
3672 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3673 return JNI_OK;
3674 }
3675
3676 JavaVMInitArgs* get() { return &_args; }
3677 bool is_set() { return _is_set; }
3678
3679 ~ScopedVMInitArgs() {
3680 if (_args.options == NULL) return;
3681 for (int i = 0; i < _args.nOptions; i++) {
3682 os::free(_args.options[i].optionString);
3683 }
3684 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3685 }
3686
3687 // Insert options into this option list, to replace option at
3688 // vm_options_file_pos (-XX:VMOptionsFile)
3689 jint insert(const JavaVMInitArgs* args,
3690 const JavaVMInitArgs* args_to_insert,
3691 const int vm_options_file_pos) {
3692 assert(_args.options == NULL, "shouldn't be set yet");
3693 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3694 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3695
3696 int length = args->nOptions + args_to_insert->nOptions - 1;
3697 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3698 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3699 for (int i = 0; i < args->nOptions; i++) {
3700 if (i == vm_options_file_pos) {
3701 // insert the new options starting at the same place as the
3702 // -XX:VMOptionsFile option
3703 for (int j = 0; j < args_to_insert->nOptions; j++) {
3704 options->push(args_to_insert->options[j]);
3705 }
3706 } else {
3707 options->push(args->options[i]);
3708 }
3709 }
3710 // make into options array
3711 jint result = set_args(options);
3712 delete options;
3713 return result;
3714 }
3715 };
3716
3717 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3718 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3719 }
3720
3721 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3722 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3723 }
3724
3725 jint Arguments::parse_options_environment_variable(const char* name,
3726 ScopedVMInitArgs* vm_args) {
3727 char *buffer = ::getenv(name);
3728
3729 // Don't check this environment variable if user has special privileges
3730 // (e.g. unix su command).
3731 if (buffer == NULL || os::have_special_privileges()) {
3732 return JNI_OK;
3733 }
3734
3735 if ((buffer = os::strdup(buffer)) == NULL) {
3736 return JNI_ENOMEM;
3737 }
3738
3739 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3740
3741 os::free(buffer);
3742 return retcode;
3743 }
3744
3745 const int OPTION_BUFFER_SIZE = 1024;
3746
3747 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3748 // read file into buffer
3749 int fd = ::open(file_name, O_RDONLY);
3750 if (fd < 0) {
3751 jio_fprintf(defaultStream::error_stream(),
3752 "Could not open options file '%s'\n",
3753 file_name);
3754 return JNI_ERR;
3755 }
3756
3757 // '+ 1' for NULL termination even with max bytes
3758 int bytes_alloc = OPTION_BUFFER_SIZE + 1;
3759
3760 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3761 if (NULL == buf) {
3762 jio_fprintf(defaultStream::error_stream(),
3763 "Could not allocate read buffer for options file parse\n");
3764 os::close(fd);
3765 return JNI_ENOMEM;
3766 }
3767
3768 memset(buf, 0, (unsigned)bytes_alloc);
3769
3770 // Fill buffer
3771 // Use ::read() instead of os::read because os::read()
3772 // might do a thread state transition
3773 // and it is too early for that here
3774
3775 int bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3776 os::close(fd);
3777 if (bytes_read < 0) {
3778 FREE_C_HEAP_ARRAY(char, buf);
3779 jio_fprintf(defaultStream::error_stream(),
3780 "Could not read options file '%s'\n", file_name);
3781 return JNI_ERR;
3782 }
3783
3784 if (bytes_read == 0) {
3785 // tell caller there is no option data and that is ok
3786 FREE_C_HEAP_ARRAY(char, buf);
3787 return JNI_OK;
3788 }
3789
3790 // file is larger than OPTION_BUFFER_SIZE
3791 if (bytes_read > bytes_alloc - 1) {
3792 FREE_C_HEAP_ARRAY(char, buf);
3793 jio_fprintf(defaultStream::error_stream(),
3794 "Options file '%s' is larger than %d bytes.\n",
3795 file_name, bytes_alloc - 1);
3796 return JNI_EINVAL;
3797 }
3798
3799 int retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3800
3801 FREE_C_HEAP_ARRAY(char, buf);
3802 return retcode;
3803 }
3804
3805 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3806 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3807
3808 // some pointers to help with parsing
3809 char *buffer_end = buffer + buf_len;
3810 char *opt_hd = buffer;
3811 char *wrt = buffer;
3812 char *rd = buffer;
3813
3814 // parse all options
3815 while (rd < buffer_end) {
3816 // skip leading white space from the input string
3817 while (rd < buffer_end && isspace(*rd)) {
3818 rd++;
3819 }
3820
3821 if (rd >= buffer_end) {
3822 break;
3823 }
3824
3825 // Remember this is where we found the head of the token.
3826 opt_hd = wrt;
3827
3828 // Tokens are strings of non white space characters separated
3829 // by one or more white spaces.
3830 while (rd < buffer_end && !isspace(*rd)) {
3831 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3832 int quote = *rd; // matching quote to look for
3833 rd++; // don't copy open quote
3834 while (rd < buffer_end && *rd != quote) {
3835 // include everything (even spaces)
3836 // up until the close quote
3837 *wrt++ = *rd++; // copy to option string
3838 }
3839
3840 if (rd < buffer_end) {
3841 rd++; // don't copy close quote
3842 } else {
3843 // did not see closing quote
3844 jio_fprintf(defaultStream::error_stream(),
3845 "Unmatched quote in %s\n", name);
3846 delete options;
3847 return JNI_ERR;
3848 }
3849 } else {
3850 *wrt++ = *rd++; // copy to option string
3851 }
3852 }
3853
3854 // steal a white space character and set it to NULL
3855 *wrt++ = '\0';
3856 // We now have a complete token
3857
3858 JavaVMOption option;
3859 option.optionString = opt_hd;
3860
3861 options->append(option); // Fill in option
3862
3863 rd++; // Advance to next character
3864 }
3865
3866 // Fill out JavaVMInitArgs structure.
3867 jint status = vm_args->set_args(options);
3868
3869 delete options;
3870 return status;
3871 }
3872
3873 void Arguments::set_shared_spaces_flags() {
3874 if (DumpSharedSpaces) {
3875 if (RequireSharedSpaces) {
3876 warning("Cannot dump shared archive while using shared archive");
3877 }
3878 UseSharedSpaces = false;
3879 #ifdef _LP64
3880 if (!UseCompressedOops || !UseCompressedClassPointers) {
3881 vm_exit_during_initialization(
3882 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3883 }
3884 } else {
3885 if (!UseCompressedOops || !UseCompressedClassPointers) {
3886 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3887 }
3888 #endif
3889 }
3890 }
3891
3892 #if !INCLUDE_ALL_GCS
3893 static void force_serial_gc() {
3894 FLAG_SET_DEFAULT(UseSerialGC, true);
3895 UNSUPPORTED_GC_OPTION(UseG1GC);
3896 UNSUPPORTED_GC_OPTION(UseParallelGC);
3897 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3898 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3899 UNSUPPORTED_GC_OPTION(UseParNewGC);
3900 }
3901 #endif // INCLUDE_ALL_GCS
3902
3903 // Sharing support
3904 // Construct the path to the archive
3905 static char* get_shared_archive_path() {
3906 char *shared_archive_path;
3907 if (SharedArchiveFile == NULL) {
3908 char jvm_path[JVM_MAXPATHLEN];
3909 os::jvm_path(jvm_path, sizeof(jvm_path));
3910 char *end = strrchr(jvm_path, *os::file_separator());
3911 if (end != NULL) *end = '\0';
3912 size_t jvm_path_len = strlen(jvm_path);
3913 size_t file_sep_len = strlen(os::file_separator());
3914 const size_t len = jvm_path_len + file_sep_len + 20;
3915 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3916 if (shared_archive_path != NULL) {
3917 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3918 jvm_path, os::file_separator());
3919 }
3920 } else {
3921 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3922 }
3923 return shared_archive_path;
3924 }
3925
3926 #ifndef PRODUCT
3927 // Determine whether LogVMOutput should be implicitly turned on.
3928 static bool use_vm_log() {
3929 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3930 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3931 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3932 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3933 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3934 return true;
3935 }
3936
3937 #ifdef COMPILER1
3938 if (PrintC1Statistics) {
3939 return true;
3940 }
3941 #endif // COMPILER1
3942
3943 #ifdef COMPILER2
3944 if (PrintOptoAssembly || PrintOptoStatistics) {
3945 return true;
3946 }
3947 #endif // COMPILER2
3948
3949 return false;
3950 }
3951
3952 #endif // PRODUCT
3953
3954 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3955 char** flags_file,
3956 char** vm_options_file,
3957 const int vm_options_file_pos,
3958 ScopedVMInitArgs *vm_options_file_args,
3959 ScopedVMInitArgs* args_out) {
3960 jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args);
3961 if (code != JNI_OK) {
3962 return code;
3963 }
3964
3965 // Now set global settings from the vm_option file, giving an error if
3966 // it has VMOptionsFile in it
3967 code = match_special_option_and_act(vm_options_file_args->get(), flags_file,
3968 NULL, NULL, NULL);
3969 if (code != JNI_OK) {
3970 return code;
3971 }
3972
3973 if (vm_options_file_args->get()->nOptions < 1) {
3974 return 0;
3975 }
3976
3977 return args_out->insert(args, vm_options_file_args->get(),
3978 vm_options_file_pos);
3979 }
3980
3981 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3982 char ** flags_file,
3983 char ** vm_options_file,
3984 ScopedVMInitArgs* vm_options_file_args,
3985 ScopedVMInitArgs* args_out) {
3986 // Remaining part of option string
3987 const char* tail;
3988 int vm_options_file_pos = -1;
3989
3990 for (int index = 0; index < args->nOptions; index++) {
3991 const JavaVMOption* option = args->options + index;
3992 if (ArgumentsExt::process_options(option)) {
3993 continue;
3994 }
3995 if (match_option(option, "-XX:Flags=", &tail)) {
3996 *flags_file = (char *) tail;
3997 if (*flags_file == NULL) {
3998 jio_fprintf(defaultStream::error_stream(),
3999 "Cannot copy flags_file name.\n");
4000 return JNI_ENOMEM;
4001 }
4002 continue;
4003 }
4004 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4005 if (vm_options_file != NULL) {
4006 // The caller accepts -XX:VMOptionsFile
4007 if (*vm_options_file != NULL) {
4008 jio_fprintf(defaultStream::error_stream(),
4009 "Only one VM Options file is supported "
4010 "on the command line\n");
4011 return JNI_EINVAL;
4012 }
4013
4014 *vm_options_file = (char *) tail;
4015 vm_options_file_pos = index; // save position of -XX:VMOptionsFile
4016 if (*vm_options_file == NULL) {
4017 jio_fprintf(defaultStream::error_stream(),
4018 "Cannot copy vm_options_file name.\n");
4019 return JNI_ENOMEM;
4020 }
4021 } else {
4022 jio_fprintf(defaultStream::error_stream(),
4023 "VM options file is only supported on the command line\n");
4024 return JNI_EINVAL;
4025 }
4026 continue;
4027 }
4028 if (match_option(option, "-XX:+PrintVMOptions")) {
4029 PrintVMOptions = true;
4030 continue;
4031 }
4032 if (match_option(option, "-XX:-PrintVMOptions")) {
4033 PrintVMOptions = false;
4034 continue;
4035 }
4036 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4037 IgnoreUnrecognizedVMOptions = true;
4038 continue;
4039 }
4040 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4041 IgnoreUnrecognizedVMOptions = false;
4042 continue;
4043 }
4044 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4045 CommandLineFlags::printFlags(tty, false);
4046 vm_exit(0);
4047 }
4048 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4049 #if INCLUDE_NMT
4050 // The launcher did not setup nmt environment variable properly.
4051 if (!MemTracker::check_launcher_nmt_support(tail)) {
4052 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4053 }
4054
4055 // Verify if nmt option is valid.
4056 if (MemTracker::verify_nmt_option()) {
4057 // Late initialization, still in single-threaded mode.
4058 if (MemTracker::tracking_level() >= NMT_summary) {
4059 MemTracker::init();
4060 }
4061 } else {
4062 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4063 }
4064 continue;
4065 #else
4066 jio_fprintf(defaultStream::error_stream(),
4067 "Native Memory Tracking is not supported in this VM\n");
4068 return JNI_ERR;
4069 #endif
4070 }
4071
4072 #ifndef PRODUCT
4073 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4074 CommandLineFlags::printFlags(tty, true);
4075 vm_exit(0);
4076 }
4077 #endif
4078 }
4079
4080 // If there's a VMOptionsFile, parse that (also can set flags_file)
4081 if ((vm_options_file != NULL) && (*vm_options_file != NULL)) {
4082 return insert_vm_options_file(args, flags_file, vm_options_file,
4083 vm_options_file_pos, vm_options_file_args, args_out);
4084 }
4085 return JNI_OK;
4086 }
4087
4088 static void print_options(const JavaVMInitArgs *args) {
4089 const char* tail;
4090 for (int index = 0; index < args->nOptions; index++) {
4091 const JavaVMOption *option = args->options + index;
4092 if (match_option(option, "-XX:", &tail)) {
4093 logOption(tail);
4094 }
4095 }
4096 }
4097
4098 // Parse entry point called from JNI_CreateJavaVM
4099
4100 jint Arguments::parse(const JavaVMInitArgs* args) {
4101 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4102
4103 // Initialize ranges and constraints
4104 CommandLineFlagRangeList::init();
4105 CommandLineFlagConstraintList::init();
4106
4107 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4108 const char* hotspotrc = ".hotspotrc";
4109 char* flags_file = NULL;
4110 char* vm_options_file = NULL;
4111 bool settings_file_specified = false;
4112 bool needs_hotspotrc_warning = false;
4113 ScopedVMInitArgs java_tool_options_args;
4114 ScopedVMInitArgs java_options_args;
4115 ScopedVMInitArgs modified_cmd_line_args;
4116 // Pass in vm_options_file_args to keep memory for flags_file from being
4117 // deallocated if found in the vm options file.
4118 ScopedVMInitArgs vm_options_file_args;
4119
4120 jint code =
4121 parse_java_tool_options_environment_variable(&java_tool_options_args);
4122 if (code != JNI_OK) {
4123 return code;
4124 }
4125
4126 code = parse_java_options_environment_variable(&java_options_args);
4127 if (code != JNI_OK) {
4128 return code;
4129 }
4130
4131 code = match_special_option_and_act(java_tool_options_args.get(),
4132 &flags_file, NULL, NULL, NULL);
4133 if (code != JNI_OK) {
4134 return code;
4135 }
4136
4137 code = match_special_option_and_act(args, &flags_file, &vm_options_file,
4138 &vm_options_file_args,
4139 &modified_cmd_line_args);
4140 if (code != JNI_OK) {
4141 return code;
4142 }
4143
4144
4145 // The command line arguments have been modified to include VMOptionsFile arguments.
4146 if (modified_cmd_line_args.is_set()) {
4147 args = modified_cmd_line_args.get();
4148 }
4149
4150 code = match_special_option_and_act(java_options_args.get(), &flags_file,
4151 NULL, NULL, NULL);
4152 if (code != JNI_OK) {
4153 return code;
4154 }
4155
4156 settings_file_specified = (flags_file != NULL);
4157
4158 if (IgnoreUnrecognizedVMOptions) {
4159 // uncast const to modify the flag args->ignoreUnrecognized
4160 *(jboolean*)(&args->ignoreUnrecognized) = true;
4161 java_tool_options_args.get()->ignoreUnrecognized = true;
4162 java_options_args.get()->ignoreUnrecognized = true;
4163 }
4164
4165 // Parse specified settings file
4166 if (settings_file_specified) {
4167 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4168 return JNI_EINVAL;
4169 }
4170 } else {
4171 #ifdef ASSERT
4172 // Parse default .hotspotrc settings file
4173 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4174 return JNI_EINVAL;
4175 }
4176 #else
4177 struct stat buf;
4178 if (os::stat(hotspotrc, &buf) == 0) {
4179 needs_hotspotrc_warning = true;
4180 }
4181 #endif
4182 }
4183
4184 if (PrintVMOptions) {
4185 print_options(java_tool_options_args.get());
4186 print_options(args);
4187 print_options(java_options_args.get());
4188 }
4189
4190 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4191 jint result = parse_vm_init_args(java_tool_options_args.get(),
4192 java_options_args.get(),
4193 args); // command line arguments
4194
4195 if (result != JNI_OK) {
4196 return result;
4197 }
4198
4199 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4200 SharedArchivePath = get_shared_archive_path();
4201 if (SharedArchivePath == NULL) {
4202 return JNI_ENOMEM;
4203 }
4204
4205 // Set up VerifySharedSpaces
4206 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4207 VerifySharedSpaces = true;
4208 }
4209
4210 // Delay warning until here so that we've had a chance to process
4211 // the -XX:-PrintWarnings flag
4212 if (needs_hotspotrc_warning) {
4213 warning("%s file is present but has been ignored. "
4214 "Run with -XX:Flags=%s to load the file.",
4215 hotspotrc, hotspotrc);
4216 }
4217
4218 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4219 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4220 #endif
4221
4222 ArgumentsExt::report_unsupported_options();
4223
4224 #ifndef PRODUCT
4225 if (TraceBytecodesAt != 0) {
4226 TraceBytecodes = true;
4227 }
4228 if (CountCompiledCalls) {
4229 if (UseCounterDecay) {
4230 warning("UseCounterDecay disabled because CountCalls is set");
4231 UseCounterDecay = false;
4232 }
4233 }
4234 #endif // PRODUCT
4235
4236 if (ScavengeRootsInCode == 0) {
4237 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4238 warning("Forcing ScavengeRootsInCode non-zero");
4239 }
4240 ScavengeRootsInCode = 1;
4241 }
4242
4243 if (PrintGCDetails) {
4244 // Turn on -verbose:gc options as well
4245 PrintGC = true;
4246 }
4247
4248 // Set object alignment values.
4249 set_object_alignment();
4250
4251 #if !INCLUDE_ALL_GCS
4252 force_serial_gc();
4253 #endif // INCLUDE_ALL_GCS
4254 #if !INCLUDE_CDS
4255 if (DumpSharedSpaces || RequireSharedSpaces) {
4256 jio_fprintf(defaultStream::error_stream(),
4257 "Shared spaces are not supported in this VM\n");
4258 return JNI_ERR;
4259 }
4260 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4261 warning("Shared spaces are not supported in this VM");
4262 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4263 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4264 }
4265 no_shared_spaces("CDS Disabled");
4266 #endif // INCLUDE_CDS
4267
4268 return JNI_OK;
4269 }
4270
4271 jint Arguments::apply_ergo() {
4272
4273 // Set flags based on ergonomics.
4274 set_ergonomics_flags();
4275
4276 set_shared_spaces_flags();
4277
4278 // Check the GC selections again.
4279 if (!check_gc_consistency()) {
4280 return JNI_EINVAL;
4281 }
4282
4283 if (TieredCompilation) {
4284 set_tiered_flags();
4285 } else {
4286 int max_compilation_policy_choice = 1;
4287 #ifdef COMPILER2
4288 max_compilation_policy_choice = 2;
4289 #endif
4290 // Check if the policy is valid.
4291 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4292 vm_exit_during_initialization(
4293 "Incompatible compilation policy selected", NULL);
4294 }
4295 // Scale CompileThreshold
4296 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4297 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4298 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4299 }
4300 }
4301
4302 #ifdef COMPILER2
4303 #ifndef PRODUCT
4304 if (PrintIdealGraphLevel > 0) {
4305 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4306 }
4307 #endif
4308 #endif
4309
4310 // Set heap size based on available physical memory
4311 set_heap_size();
4312
4313 ArgumentsExt::set_gc_specific_flags();
4314
4315 // Initialize Metaspace flags and alignments
4316 Metaspace::ergo_initialize();
4317
4318 // Set bytecode rewriting flags
4319 set_bytecode_flags();
4320
4321 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4322 jint code = set_aggressive_opts_flags();
4323 if (code != JNI_OK) {
4324 return code;
4325 }
4326
4327 // Turn off biased locking for locking debug mode flags,
4328 // which are subtly different from each other but neither works with
4329 // biased locking
4330 if (UseHeavyMonitors
4331 #ifdef COMPILER1
4332 || !UseFastLocking
4333 #endif // COMPILER1
4334 #if INCLUDE_JVMCI
4335 || !JVMCIUseFastLocking
4336 #endif
4337 ) {
4338 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4339 // flag set to true on command line; warn the user that they
4340 // can't enable biased locking here
4341 warning("Biased Locking is not supported with locking debug flags"
4342 "; ignoring UseBiasedLocking flag." );
4343 }
4344 UseBiasedLocking = false;
4345 }
4346
4347 #ifdef ZERO
4348 // Clear flags not supported on zero.
4349 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4350 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4351 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4352 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4353 #endif // CC_INTERP
4354
4355 #ifdef COMPILER2
4356 if (!EliminateLocks) {
4357 EliminateNestedLocks = false;
4358 }
4359 if (!Inline) {
4360 IncrementalInline = false;
4361 }
4362 #ifndef PRODUCT
4363 if (!IncrementalInline) {
4364 AlwaysIncrementalInline = false;
4365 }
4366 #endif
4367 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4368 // nothing to use the profiling, turn if off
4369 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4370 }
4371 #endif
4372
4373 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4374 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4375 DebugNonSafepoints = true;
4376 }
4377
4378 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4379 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4380 }
4381
4382 #ifndef PRODUCT
4383 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4384 if (use_vm_log()) {
4385 LogVMOutput = true;
4386 }
4387 }
4388 #endif // PRODUCT
4389
4390 if (PrintCommandLineFlags) {
4391 CommandLineFlags::printSetFlags(tty);
4392 }
4393
4394 // Apply CPU specific policy for the BiasedLocking
4395 if (UseBiasedLocking) {
4396 if (!VM_Version::use_biased_locking() &&
4397 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4398 UseBiasedLocking = false;
4399 }
4400 }
4401 #ifdef COMPILER2
4402 if (!UseBiasedLocking || EmitSync != 0) {
4403 UseOptoBiasInlining = false;
4404 }
4405 #endif
4406
4407 return JNI_OK;
4408 }
4409
4410 jint Arguments::adjust_after_os() {
4411 if (UseNUMA) {
4412 if (UseParallelGC || UseParallelOldGC) {
4413 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4414 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4415 }
4416 }
4417 // UseNUMAInterleaving is set to ON for all collectors and
4418 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4419 // such as the parallel collector for Linux and Solaris will
4420 // interleave old gen and survivor spaces on top of NUMA
4421 // allocation policy for the eden space.
4422 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4423 // all platforms and ParallelGC on Windows will interleave all
4424 // of the heap spaces across NUMA nodes.
4425 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4426 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4427 }
4428 }
4429 return JNI_OK;
4430 }
4431
4432 int Arguments::PropertyList_count(SystemProperty* pl) {
4433 int count = 0;
4434 while(pl != NULL) {
4435 count++;
4436 pl = pl->next();
4437 }
4438 return count;
4439 }
4440
4441 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4442 assert(key != NULL, "just checking");
4443 SystemProperty* prop;
4444 for (prop = pl; prop != NULL; prop = prop->next()) {
4445 if (strcmp(key, prop->key()) == 0) return prop->value();
4446 }
4447 return NULL;
4448 }
4449
4450 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4451 int count = 0;
4452 const char* ret_val = NULL;
4453
4454 while(pl != NULL) {
4455 if(count >= index) {
4456 ret_val = pl->key();
4457 break;
4458 }
4459 count++;
4460 pl = pl->next();
4461 }
4462
4463 return ret_val;
4464 }
4465
4466 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4467 int count = 0;
4468 char* ret_val = NULL;
4469
4470 while(pl != NULL) {
4471 if(count >= index) {
4472 ret_val = pl->value();
4473 break;
4474 }
4475 count++;
4476 pl = pl->next();
4477 }
4478
4479 return ret_val;
4480 }
4481
4482 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4483 SystemProperty* p = *plist;
4484 if (p == NULL) {
4485 *plist = new_p;
4486 } else {
4487 while (p->next() != NULL) {
4488 p = p->next();
4489 }
4490 p->set_next(new_p);
4491 }
4492 }
4493
4494 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4495 if (plist == NULL)
4496 return;
4497
4498 SystemProperty* new_p = new SystemProperty(k, v, true);
4499 PropertyList_add(plist, new_p);
4500 }
4501
4502 void Arguments::PropertyList_add(SystemProperty *element) {
4503 PropertyList_add(&_system_properties, element);
4504 }
4505
4506 // This add maintains unique property key in the list.
4507 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4508 if (plist == NULL)
4509 return;
4510
4511 // If property key exist then update with new value.
4512 SystemProperty* prop;
4513 for (prop = *plist; prop != NULL; prop = prop->next()) {
4514 if (strcmp(k, prop->key()) == 0) {
4515 if (append) {
4516 prop->append_value(v);
4517 } else {
4518 prop->set_value(v);
4519 }
4520 return;
4521 }
4522 }
4523
4524 PropertyList_add(plist, k, v);
4525 }
4526
4527 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4528 // Returns true if all of the source pointed by src has been copied over to
4529 // the destination buffer pointed by buf. Otherwise, returns false.
4530 // Notes:
4531 // 1. If the length (buflen) of the destination buffer excluding the
4532 // NULL terminator character is not long enough for holding the expanded
4533 // pid characters, it also returns false instead of returning the partially
4534 // expanded one.
4535 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4536 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4537 char* buf, size_t buflen) {
4538 const char* p = src;
4539 char* b = buf;
4540 const char* src_end = &src[srclen];
4541 char* buf_end = &buf[buflen - 1];
4542
4543 while (p < src_end && b < buf_end) {
4544 if (*p == '%') {
4545 switch (*(++p)) {
4546 case '%': // "%%" ==> "%"
4547 *b++ = *p++;
4548 break;
4549 case 'p': { // "%p" ==> current process id
4550 // buf_end points to the character before the last character so
4551 // that we could write '\0' to the end of the buffer.
4552 size_t buf_sz = buf_end - b + 1;
4553 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4554
4555 // if jio_snprintf fails or the buffer is not long enough to hold
4556 // the expanded pid, returns false.
4557 if (ret < 0 || ret >= (int)buf_sz) {
4558 return false;
4559 } else {
4560 b += ret;
4561 assert(*b == '\0', "fail in copy_expand_pid");
4562 if (p == src_end && b == buf_end + 1) {
4563 // reach the end of the buffer.
4564 return true;
4565 }
4566 }
4567 p++;
4568 break;
4569 }
4570 default :
4571 *b++ = '%';
4572 }
4573 } else {
4574 *b++ = *p++;
4575 }
4576 }
4577 *b = '\0';
4578 return (p == src_end); // return false if not all of the source was copied
4579 }