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 "logging/logConfiguration.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/arguments_ext.hpp"
42 #include "runtime/commandLineFlagConstraintList.hpp"
43 #include "runtime/commandLineFlagRangeList.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/globals_extension.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/os.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "services/management.hpp"
50 #include "services/memTracker.hpp"
51 #include "utilities/defaultStream.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/stringUtils.hpp"
54 #if INCLUDE_JVMCI
55 #include "jvmci/jvmciRuntime.hpp"
56 #endif
57 #if INCLUDE_ALL_GCS
58 #include "gc/cms/compactibleFreeListSpace.hpp"
59 #include "gc/g1/g1CollectedHeap.inline.hpp"
60 #include "gc/parallel/parallelScavengeHeap.hpp"
61 #endif // INCLUDE_ALL_GCS
62
63 // Note: This is a special bug reporting site for the JVM
64 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
65 #define DEFAULT_JAVA_LAUNCHER "generic"
66
67 #define UNSUPPORTED_GC_OPTION(gc) \
68 do { \
69 if (gc) { \
70 if (FLAG_IS_CMDLINE(gc)) { \
71 warning(#gc " is not supported in this VM. Using Serial GC."); \
72 } \
73 FLAG_SET_DEFAULT(gc, false); \
74 } \
75 } while(0)
76
77 char* Arguments::_jvm_flags_file = NULL;
78 char** Arguments::_jvm_flags_array = NULL;
79 int Arguments::_num_jvm_flags = 0;
80 char** Arguments::_jvm_args_array = NULL;
81 int Arguments::_num_jvm_args = 0;
82 char* Arguments::_java_command = NULL;
83 SystemProperty* Arguments::_system_properties = NULL;
84 const char* Arguments::_gc_log_filename = NULL;
85 bool Arguments::_has_profile = false;
86 size_t Arguments::_conservative_max_heap_alignment = 0;
87 size_t Arguments::_min_heap_size = 0;
88 Arguments::Mode Arguments::_mode = _mixed;
89 bool Arguments::_java_compiler = false;
90 bool Arguments::_xdebug_mode = false;
91 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
92 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
93 int Arguments::_sun_java_launcher_pid = -1;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
102 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
103
104 char* Arguments::SharedArchivePath = NULL;
105
106 AgentLibraryList Arguments::_libraryList;
107 AgentLibraryList Arguments::_agentList;
108
109 abort_hook_t Arguments::_abort_hook = NULL;
110 exit_hook_t Arguments::_exit_hook = NULL;
111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = NULL;
115 SystemProperty *Arguments::_java_library_path = NULL;
116 SystemProperty *Arguments::_java_home = NULL;
117 SystemProperty *Arguments::_java_class_path = NULL;
118 SystemProperty *Arguments::_sun_boot_class_path = NULL;
119
120 char* Arguments::_ext_dirs = NULL;
121
122 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
123 // part of the option string.
124 static bool match_option(const JavaVMOption *option, const char* name,
125 const char** tail) {
126 size_t len = strlen(name);
127 if (strncmp(option->optionString, name, len) == 0) {
128 *tail = option->optionString + len;
129 return true;
130 } else {
131 return false;
132 }
133 }
134
135 // Check if 'option' matches 'name'. No "tail" is allowed.
136 static bool match_option(const JavaVMOption *option, const char* name) {
137 const char* tail = NULL;
138 bool result = match_option(option, name, &tail);
139 if (tail != NULL && *tail == '\0') {
140 return result;
141 } else {
142 return false;
143 }
144 }
145
146 // Return true if any of the strings in null-terminated array 'names' matches.
147 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
148 // the option must match exactly.
149 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
150 bool tail_allowed) {
151 for (/* empty */; *names != NULL; ++names) {
152 if (match_option(option, *names, tail)) {
153 if (**tail == '\0' || tail_allowed && **tail == ':') {
154 return true;
155 }
156 }
157 }
158 return false;
159 }
160
161 static void logOption(const char* opt) {
162 if (PrintVMOptions) {
163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
164 }
165 }
166
167 // Process java launcher properties.
168 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
169 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
170 // sun.java.launcher.pid is defined.
171 // Must do this before setting up other system properties,
172 // as some of them may depend on launcher type.
173 for (int index = 0; index < args->nOptions; index++) {
174 const JavaVMOption* option = args->options + index;
175 const char* tail;
176
177 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
178 process_java_launcher_argument(tail, option->extraInfo);
179 continue;
180 }
181 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
182 if (strcmp(tail, "true") == 0) {
183 _sun_java_launcher_is_altjvm = true;
184 }
185 continue;
186 }
187 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
188 _sun_java_launcher_pid = atoi(tail);
189 continue;
190 }
191 }
192 }
193
194 // Initialize system properties key and value.
195 void Arguments::init_system_properties() {
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
197 "Java Virtual Machine Specification", false));
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
201
202 // Following are JVMTI agent writable properties.
203 // Properties values are set to NULL and they are
204 // os specific they are initialized in os::init_system_properties_values().
205 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
206 _java_library_path = new SystemProperty("java.library.path", NULL, true);
207 _java_home = new SystemProperty("java.home", NULL, true);
208 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
209
210 _java_class_path = new SystemProperty("java.class.path", "", true);
211
212 // Add to System Property list.
213 PropertyList_add(&_system_properties, _sun_boot_library_path);
214 PropertyList_add(&_system_properties, _java_library_path);
215 PropertyList_add(&_system_properties, _java_home);
216 PropertyList_add(&_system_properties, _java_class_path);
217 PropertyList_add(&_system_properties, _sun_boot_class_path);
218
219 // Set OS specific system properties values
220 os::init_system_properties_values();
221
222 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
223 }
224
225 // Update/Initialize System properties after JDK version number is known
226 void Arguments::init_version_specific_system_properties() {
227 enum { bufsz = 16 };
228 char buffer[bufsz];
229 const char* spec_vendor = "Oracle Corporation";
230 uint32_t spec_version = JDK_Version::current().major_version();
231
232 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
233
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
236 PropertyList_add(&_system_properties,
237 new SystemProperty("java.vm.specification.version", buffer, false));
238 PropertyList_add(&_system_properties,
239 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
240 }
241
242 /*
243 * -XX argument processing:
244 *
245 * -XX arguments are defined in several places, such as:
246 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
247 * -XX arguments are parsed in parse_argument().
248 * -XX argument bounds checking is done in check_vm_args_consistency().
249 *
250 * Over time -XX arguments may change. There are mechanisms to handle common cases:
251 *
252 * ALIASED: An option that is simply another name for another option. This is often
253 * part of the process of deprecating a flag, but not all aliases need
254 * to be deprecated.
255 *
256 * Create an alias for an option by adding the old and new option names to the
257 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
258 *
259 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
260 * support may be removed in the future. Both regular and aliased options may be
261 * deprecated.
262 *
263 * Add a deprecation warning for an option (or alias) by adding an entry in the
264 * "special_jvm_flags" table and setting the "deprecated_in" field.
265 * Often an option "deprecated" in one major release will
266 * be made "obsolete" in the next. In this case the entry should also have it's
267 * "obsolete_in" field set.
268 *
269 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
270 * on the command line. A warning is printed to let the user know that option might not
271 * be accepted in the future.
272 *
273 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
274 * table and setting the "obsolete_in" field.
275 *
276 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
277 * to the current JDK version. The system will flatly refuse to admit the existence of
278 * the flag. This allows a flag to die automatically over JDK releases.
279 *
280 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
281 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
282 * - Newly obsolete or expired deprecated options should have their global variable
283 * definitions removed (from globals.hpp, etc) and related implementations removed.
284 *
285 * Recommended approach for removing options:
286 *
287 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
288 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
289 *
290 * To remove internal options (e.g. diagnostic, experimental, develop options), use
291 * a 2-step model adding major release numbers to the obsolete and expire columns.
292 *
293 * To change the name of an option, use the alias table as well as a 2-step
294 * model adding major release numbers to the deprecate and expire columns.
295 * Think twice about aliasing commonly used customer options.
296 *
297 * There are times when it is appropriate to leave a future release number as undefined.
298 *
299 * Tests: Aliases should be tested in VMAliasOptions.java.
300 * Deprecated options should be tested in VMDeprecatedOptions.java.
301 */
302
303 // Obsolete or deprecated -XX flag.
304 typedef struct {
305 const char* name;
306 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
307 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
308 JDK_Version expired_in; // When the option expires (or "undefined").
309 } SpecialFlag;
310
311 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
312 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
313 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
314 // the command-line as usual, but will issue a warning.
315 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
316 // the command-line, while issuing a warning and ignoring the flag value.
317 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
318 // existence of the flag.
319 //
320 // MANUAL CLEANUP ON JDK VERSION UPDATES:
321 // This table ensures that the handling of options will update automatically when the JDK
322 // version is incremented, but the source code needs to be cleanup up manually:
323 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
324 // variable should be removed, as well as users of the variable.
325 // - As "deprecated" options age into "obsolete" options, move the entry into the
326 // "Obsolete Flags" section of the table.
327 // - All expired options should be removed from the table.
328 static SpecialFlag const special_jvm_flags[] = {
329 // -------------- Deprecated Flags --------------
330 // --- Non-alias flags - sorted by obsolete_in then expired_in:
331 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
332 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
333
334 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
335 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
336 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
337 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
338 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
339 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
340 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
341 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
342
343 // -------------- Obsolete Flags - sorted by expired_in --------------
344 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
345 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
346 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
347 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
348 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
349 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 #ifndef ZERO
358 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 #endif // ZERO
361 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370
371 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
372 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
373 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
374 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
375 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
376 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
377 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
378 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
379 #endif
380
381 { NULL, JDK_Version(0), JDK_Version(0) }
382 };
383
384 // Flags that are aliases for other flags.
385 typedef struct {
386 const char* alias_name;
387 const char* real_name;
388 } AliasedFlag;
389
390 static AliasedFlag const aliased_jvm_flags[] = {
391 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
392 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
393 { "CMSMarkStackSize", "MarkStackSize" },
394 { "G1MarkStackSize", "MarkStackSize" },
395 { "ParallelMarkingThreads", "ConcGCThreads" },
396 { "ParallelCMSThreads", "ConcGCThreads" },
397 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
398 { NULL, NULL}
399 };
400
401 // Return true if "v" is less than "other", where "other" may be "undefined".
402 static bool version_less_than(JDK_Version v, JDK_Version other) {
403 assert(!v.is_undefined(), "must be defined");
404 if (!other.is_undefined() && v.compare(other) >= 0) {
405 return false;
406 } else {
407 return true;
408 }
409 }
410
411 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
412 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
413 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
414 flag = special_jvm_flags[i];
415 return true;
416 }
417 }
418 return false;
419 }
420
421 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
422 assert(version != NULL, "Must provide a version buffer");
423 SpecialFlag flag;
424 if (lookup_special_flag(flag_name, flag)) {
425 if (!flag.obsolete_in.is_undefined()) {
426 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
427 *version = flag.obsolete_in;
428 return true;
429 }
430 }
431 }
432 return false;
433 }
434
435 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
436 assert(version != NULL, "Must provide a version buffer");
437 SpecialFlag flag;
438 if (lookup_special_flag(flag_name, flag)) {
439 if (!flag.deprecated_in.is_undefined()) {
440 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
441 version_less_than(JDK_Version::current(), flag.expired_in)) {
442 *version = flag.deprecated_in;
443 return 1;
444 } else {
445 return -1;
446 }
447 }
448 }
449 return 0;
450 }
451
452 const char* Arguments::real_flag_name(const char *flag_name) {
453 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
454 const AliasedFlag& flag_status = aliased_jvm_flags[i];
455 if (strcmp(flag_status.alias_name, flag_name) == 0) {
456 return flag_status.real_name;
457 }
458 }
459 return flag_name;
460 }
461
462 #ifndef PRODUCT
463 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
464 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
465 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
466 return true;
467 }
468 }
469 return false;
470 }
471
472 static bool verify_special_jvm_flags() {
473 bool success = true;
474 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
475 const SpecialFlag& flag = special_jvm_flags[i];
476 if (lookup_special_flag(flag.name, i)) {
477 warning("Duplicate special flag declaration \"%s\"", flag.name);
478 success = false;
479 }
480 if (flag.deprecated_in.is_undefined() &&
481 flag.obsolete_in.is_undefined()) {
482 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
483 success = false;
484 }
485
486 if (!flag.deprecated_in.is_undefined()) {
487 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
488 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
489 success = false;
490 }
491
492 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
493 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
494 success = false;
495 }
496 }
497
498 if (!flag.obsolete_in.is_undefined()) {
499 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
500 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
501 success = false;
502 }
503
504 // if flag has become obsolete it should not have a "globals" flag defined anymore.
505 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
506 if (Flag::find_flag(flag.name) != NULL) {
507 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
508 success = false;
509 }
510 }
511 }
512
513 if (!flag.expired_in.is_undefined()) {
514 // if flag has become expired it should not have a "globals" flag defined anymore.
515 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
516 if (Flag::find_flag(flag.name) != NULL) {
517 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
518 success = false;
519 }
520 }
521 }
522
523 }
524 return success;
525 }
526 #endif
527
528 // Constructs the system class path (aka boot class path) from the following
529 // components, in order:
530 //
531 // prefix // from -Xbootclasspath/p:...
532 // base // from os::get_system_properties() or -Xbootclasspath=
533 // suffix // from -Xbootclasspath/a:...
534 //
535 // This could be AllStatic, but it isn't needed after argument processing is
536 // complete.
537 class SysClassPath: public StackObj {
538 public:
539 SysClassPath(const char* base);
540 ~SysClassPath();
541
542 inline void set_base(const char* base);
543 inline void add_prefix(const char* prefix);
544 inline void add_suffix_to_prefix(const char* suffix);
545 inline void add_suffix(const char* suffix);
546 inline void reset_path(const char* base);
547
548 inline const char* get_base() const { return _items[_scp_base]; }
549 inline const char* get_prefix() const { return _items[_scp_prefix]; }
550 inline const char* get_suffix() const { return _items[_scp_suffix]; }
551
552 // Combine all the components into a single c-heap-allocated string; caller
553 // must free the string if/when no longer needed.
554 char* combined_path();
555
556 private:
557 // Utility routines.
558 static char* add_to_path(const char* path, const char* str, bool prepend);
559 static char* add_jars_to_path(char* path, const char* directory);
560
561 inline void reset_item_at(int index);
562
563 // Array indices for the items that make up the sysclasspath. All except the
564 // base are allocated in the C heap and freed by this class.
565 enum {
566 _scp_prefix, // from -Xbootclasspath/p:...
567 _scp_base, // the default sysclasspath
568 _scp_suffix, // from -Xbootclasspath/a:...
569 _scp_nitems // the number of items, must be last.
570 };
571
572 const char* _items[_scp_nitems];
573 };
574
575 SysClassPath::SysClassPath(const char* base) {
576 memset(_items, 0, sizeof(_items));
577 _items[_scp_base] = base;
578 }
579
580 SysClassPath::~SysClassPath() {
581 // Free everything except the base.
582 for (int i = 0; i < _scp_nitems; ++i) {
583 if (i != _scp_base) reset_item_at(i);
584 }
585 }
586
587 inline void SysClassPath::set_base(const char* base) {
588 _items[_scp_base] = base;
589 }
590
591 inline void SysClassPath::add_prefix(const char* prefix) {
592 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
593 }
594
595 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
596 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
597 }
598
599 inline void SysClassPath::add_suffix(const char* suffix) {
600 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
601 }
602
603 inline void SysClassPath::reset_item_at(int index) {
604 assert(index < _scp_nitems && index != _scp_base, "just checking");
605 if (_items[index] != NULL) {
606 FREE_C_HEAP_ARRAY(char, _items[index]);
607 _items[index] = NULL;
608 }
609 }
610
611 inline void SysClassPath::reset_path(const char* base) {
612 // Clear the prefix and suffix.
613 reset_item_at(_scp_prefix);
614 reset_item_at(_scp_suffix);
615 set_base(base);
616 }
617
618 //------------------------------------------------------------------------------
619
620
621 // Combine the bootclasspath elements, some of which may be null, into a single
622 // c-heap-allocated string.
623 char* SysClassPath::combined_path() {
624 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
625
626 size_t lengths[_scp_nitems];
627 size_t total_len = 0;
628
629 const char separator = *os::path_separator();
630
631 // Get the lengths.
632 int i;
633 for (i = 0; i < _scp_nitems; ++i) {
634 if (_items[i] != NULL) {
635 lengths[i] = strlen(_items[i]);
636 // Include space for the separator char (or a NULL for the last item).
637 total_len += lengths[i] + 1;
638 }
639 }
640 assert(total_len > 0, "empty sysclasspath not allowed");
641
642 // Copy the _items to a single string.
643 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
644 char* cp_tmp = cp;
645 for (i = 0; i < _scp_nitems; ++i) {
646 if (_items[i] != NULL) {
647 memcpy(cp_tmp, _items[i], lengths[i]);
648 cp_tmp += lengths[i];
649 *cp_tmp++ = separator;
650 }
651 }
652 *--cp_tmp = '\0'; // Replace the extra separator.
653 return cp;
654 }
655
656 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
657 char*
658 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
659 char *cp;
660
661 assert(str != NULL, "just checking");
662 if (path == NULL) {
663 size_t len = strlen(str) + 1;
664 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
665 memcpy(cp, str, len); // copy the trailing null
666 } else {
667 const char separator = *os::path_separator();
668 size_t old_len = strlen(path);
669 size_t str_len = strlen(str);
670 size_t len = old_len + str_len + 2;
671
672 if (prepend) {
673 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
674 char* cp_tmp = cp;
675 memcpy(cp_tmp, str, str_len);
676 cp_tmp += str_len;
677 *cp_tmp = separator;
678 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
679 FREE_C_HEAP_ARRAY(char, path);
680 } else {
681 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
682 char* cp_tmp = cp + old_len;
683 *cp_tmp = separator;
684 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
685 }
686 }
687 return cp;
688 }
689
690 // Scan the directory and append any jar or zip files found to path.
691 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
692 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
693 DIR* dir = os::opendir(directory);
694 if (dir == NULL) return path;
695
696 char dir_sep[2] = { '\0', '\0' };
697 size_t directory_len = strlen(directory);
698 const char fileSep = *os::file_separator();
699 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
700
701 /* Scan the directory for jars/zips, appending them to path. */
702 struct dirent *entry;
703 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
704 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
705 const char* name = entry->d_name;
706 const char* ext = name + strlen(name) - 4;
707 bool isJarOrZip = ext > name &&
708 (os::file_name_strcmp(ext, ".jar") == 0 ||
709 os::file_name_strcmp(ext, ".zip") == 0);
710 if (isJarOrZip) {
711 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
712 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
713 path = add_to_path(path, jarpath, false);
714 FREE_C_HEAP_ARRAY(char, jarpath);
715 }
716 }
717 FREE_C_HEAP_ARRAY(char, dbuf);
718 os::closedir(dir);
719 return path;
720 }
721
722 // Parses a memory size specification string.
723 static bool atomull(const char *s, julong* result) {
724 julong n = 0;
725 int args_read = 0;
726 bool is_hex = false;
727 // Skip leading 0[xX] for hexadecimal
728 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
729 s += 2;
730 is_hex = true;
731 args_read = sscanf(s, JULONG_FORMAT_X, &n);
732 } else {
733 args_read = sscanf(s, JULONG_FORMAT, &n);
734 }
735 if (args_read != 1) {
736 return false;
737 }
738 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
739 s++;
740 }
741 // 4705540: illegal if more characters are found after the first non-digit
742 if (strlen(s) > 1) {
743 return false;
744 }
745 switch (*s) {
746 case 'T': case 't':
747 *result = n * G * K;
748 // Check for overflow.
749 if (*result/((julong)G * K) != n) return false;
750 return true;
751 case 'G': case 'g':
752 *result = n * G;
753 if (*result/G != n) return false;
754 return true;
755 case 'M': case 'm':
756 *result = n * M;
757 if (*result/M != n) return false;
758 return true;
759 case 'K': case 'k':
760 *result = n * K;
761 if (*result/K != n) return false;
762 return true;
763 case '\0':
764 *result = n;
765 return true;
766 default:
767 return false;
768 }
769 }
770
771 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
772 if (size < min_size) return arg_too_small;
773 // Check that size will fit in a size_t (only relevant on 32-bit)
774 if (size > max_uintx) return arg_too_big;
775 return arg_in_range;
776 }
777
778 // Describe an argument out of range error
779 void Arguments::describe_range_error(ArgsRange errcode) {
780 switch(errcode) {
781 case arg_too_big:
782 jio_fprintf(defaultStream::error_stream(),
783 "The specified size exceeds the maximum "
784 "representable size.\n");
785 break;
786 case arg_too_small:
787 case arg_unreadable:
788 case arg_in_range:
789 // do nothing for now
790 break;
791 default:
792 ShouldNotReachHere();
793 }
794 }
795
796 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
797 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
798 return true;
799 } else {
800 return false;
801 }
802 }
803
804 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
805 char* end;
806 errno = 0;
807 double v = strtod(value, &end);
808 if ((errno != 0) || (*end != 0)) {
809 return false;
810 }
811
812 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
813 return true;
814 }
815 return false;
816 }
817
818 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
819 julong v;
820 int int_v;
821 intx intx_v;
822 bool is_neg = false;
823 Flag* result = Flag::find_flag(name, strlen(name));
824
825 if (result == NULL) {
826 return false;
827 }
828
829 // Check the sign first since atomull() parses only unsigned values.
830 if (*value == '-') {
831 if (!result->is_intx() && !result->is_int()) {
832 return false;
833 }
834 value++;
835 is_neg = true;
836 }
837 if (!atomull(value, &v)) {
838 return false;
839 }
840 if (result->is_int()) {
841 int_v = (int) v;
842 if (is_neg) {
843 int_v = -int_v;
844 }
845 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
846 } else if (result->is_uint()) {
847 uint uint_v = (uint) v;
848 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
849 } else if (result->is_intx()) {
850 intx_v = (intx) v;
851 if (is_neg) {
852 intx_v = -intx_v;
853 }
854 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
855 } else if (result->is_uintx()) {
856 uintx uintx_v = (uintx) v;
857 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
858 } else if (result->is_uint64_t()) {
859 uint64_t uint64_t_v = (uint64_t) v;
860 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
861 } else if (result->is_size_t()) {
862 size_t size_t_v = (size_t) v;
863 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
864 } else {
865 return false;
866 }
867 }
868
869 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
870 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
871 // Contract: CommandLineFlags always returns a pointer that needs freeing.
872 FREE_C_HEAP_ARRAY(char, value);
873 return true;
874 }
875
876 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
877 const char* old_value = "";
878 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
879 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
880 size_t new_len = strlen(new_value);
881 const char* value;
882 char* free_this_too = NULL;
883 if (old_len == 0) {
884 value = new_value;
885 } else if (new_len == 0) {
886 value = old_value;
887 } else {
888 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
889 // each new setting adds another LINE to the switch:
890 sprintf(buf, "%s\n%s", old_value, new_value);
891 value = buf;
892 free_this_too = buf;
893 }
894 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
895 // CommandLineFlags always returns a pointer that needs freeing.
896 FREE_C_HEAP_ARRAY(char, value);
897 if (free_this_too != NULL) {
898 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
899 FREE_C_HEAP_ARRAY(char, free_this_too);
900 }
901 return true;
902 }
903
904 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
905 const char* real_name = real_flag_name(arg);
906 JDK_Version since = JDK_Version();
907 switch (is_deprecated_flag(arg, &since)) {
908 case -1:
909 return NULL; // obsolete or expired, don't process normally
910 case 0:
911 return real_name;
912 case 1: {
913 if (warn) {
914 char version[256];
915 since.to_string(version, sizeof(version));
916 if (real_name != arg) {
917 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
918 arg, version, real_name);
919 } else {
920 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
921 arg, version);
922 }
923 }
924 return real_name;
925 }
926 }
927 ShouldNotReachHere();
928 return NULL;
929 }
930
931 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
932
933 // range of acceptable characters spelled out for portability reasons
934 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
935 #define BUFLEN 255
936 char name[BUFLEN+1];
937 char dummy;
938 const char* real_name;
939 bool warn_if_deprecated = true;
940
941 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
942 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
943 if (real_name == NULL) {
944 return false;
945 }
946 return set_bool_flag(real_name, false, origin);
947 }
948 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
949 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
950 if (real_name == NULL) {
951 return false;
952 }
953 return set_bool_flag(real_name, true, origin);
954 }
955
956 char punct;
957 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
958 const char* value = strchr(arg, '=') + 1;
959 Flag* flag;
960
961 // this scanf pattern matches both strings (handled here) and numbers (handled later))
962 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
963 if (real_name == NULL) {
964 return false;
965 }
966 flag = Flag::find_flag(real_name);
967 if (flag != NULL && flag->is_ccstr()) {
968 if (flag->ccstr_accumulates()) {
969 return append_to_string_flag(real_name, value, origin);
970 } else {
971 if (value[0] == '\0') {
972 value = NULL;
973 }
974 return set_string_flag(real_name, value, origin);
975 }
976 } else {
977 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
978 }
979 }
980
981 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
982 const char* value = strchr(arg, '=') + 1;
983 // -XX:Foo:=xxx will reset the string flag to the given value.
984 if (value[0] == '\0') {
985 value = NULL;
986 }
987 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
988 if (real_name == NULL) {
989 return false;
990 }
991 return set_string_flag(real_name, value, origin);
992 }
993
994 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
995 #define SIGNED_NUMBER_RANGE "[-0123456789]"
996 #define NUMBER_RANGE "[0123456789eE+-]"
997 char value[BUFLEN + 1];
998 char value2[BUFLEN + 1];
999 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1000 // Looks like a floating-point number -- try again with more lenient format string
1001 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1002 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1003 if (real_name == NULL) {
1004 return false;
1005 }
1006 return set_fp_numeric_flag(real_name, value, origin);
1007 }
1008 }
1009
1010 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1011 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1012 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1013 if (real_name == NULL) {
1014 return false;
1015 }
1016 return set_numeric_flag(real_name, value, origin);
1017 }
1018
1019 return false;
1020 }
1021
1022 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1023 assert(bldarray != NULL, "illegal argument");
1024
1025 if (arg == NULL) {
1026 return;
1027 }
1028
1029 int new_count = *count + 1;
1030
1031 // expand the array and add arg to the last element
1032 if (*bldarray == NULL) {
1033 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1034 } else {
1035 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1036 }
1037 (*bldarray)[*count] = os::strdup_check_oom(arg);
1038 *count = new_count;
1039 }
1040
1041 void Arguments::build_jvm_args(const char* arg) {
1042 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1043 }
1044
1045 void Arguments::build_jvm_flags(const char* arg) {
1046 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1047 }
1048
1049 // utility function to return a string that concatenates all
1050 // strings in a given char** array
1051 const char* Arguments::build_resource_string(char** args, int count) {
1052 if (args == NULL || count == 0) {
1053 return NULL;
1054 }
1055 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1056 for (int i = 1; i < count; i++) {
1057 length += strlen(args[i]) + 1; // add 1 for a space
1058 }
1059 char* s = NEW_RESOURCE_ARRAY(char, length);
1060 strcpy(s, args[0]);
1061 for (int j = 1; j < count; j++) {
1062 strcat(s, " ");
1063 strcat(s, args[j]);
1064 }
1065 return (const char*) s;
1066 }
1067
1068 void Arguments::print_on(outputStream* st) {
1069 st->print_cr("VM Arguments:");
1070 if (num_jvm_flags() > 0) {
1071 st->print("jvm_flags: "); print_jvm_flags_on(st);
1072 st->cr();
1073 }
1074 if (num_jvm_args() > 0) {
1075 st->print("jvm_args: "); print_jvm_args_on(st);
1076 st->cr();
1077 }
1078 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1079 if (_java_class_path != NULL) {
1080 char* path = _java_class_path->value();
1081 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1082 }
1083 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1084 }
1085
1086 void Arguments::print_summary_on(outputStream* st) {
1087 // Print the command line. Environment variables that are helpful for
1088 // reproducing the problem are written later in the hs_err file.
1089 // flags are from setting file
1090 if (num_jvm_flags() > 0) {
1091 st->print_raw("Settings File: ");
1092 print_jvm_flags_on(st);
1093 st->cr();
1094 }
1095 // args are the command line and environment variable arguments.
1096 st->print_raw("Command Line: ");
1097 if (num_jvm_args() > 0) {
1098 print_jvm_args_on(st);
1099 }
1100 // this is the classfile and any arguments to the java program
1101 if (java_command() != NULL) {
1102 st->print("%s", java_command());
1103 }
1104 st->cr();
1105 }
1106
1107 void Arguments::print_jvm_flags_on(outputStream* st) {
1108 if (_num_jvm_flags > 0) {
1109 for (int i=0; i < _num_jvm_flags; i++) {
1110 st->print("%s ", _jvm_flags_array[i]);
1111 }
1112 }
1113 }
1114
1115 void Arguments::print_jvm_args_on(outputStream* st) {
1116 if (_num_jvm_args > 0) {
1117 for (int i=0; i < _num_jvm_args; i++) {
1118 st->print("%s ", _jvm_args_array[i]);
1119 }
1120 }
1121 }
1122
1123 bool Arguments::process_argument(const char* arg,
1124 jboolean ignore_unrecognized,
1125 Flag::Flags origin) {
1126 JDK_Version since = JDK_Version();
1127
1128 if (parse_argument(arg, origin)) {
1129 return true;
1130 }
1131
1132 // Determine if the flag has '+', '-', or '=' characters.
1133 bool has_plus_minus = (*arg == '+' || *arg == '-');
1134 const char* const argname = has_plus_minus ? arg + 1 : arg;
1135
1136 size_t arg_len;
1137 const char* equal_sign = strchr(argname, '=');
1138 if (equal_sign == NULL) {
1139 arg_len = strlen(argname);
1140 } else {
1141 arg_len = equal_sign - argname;
1142 }
1143
1144 // Only make the obsolete check for valid arguments.
1145 if (arg_len <= BUFLEN) {
1146 // Construct a string which consists only of the argument name without '+', '-', or '='.
1147 char stripped_argname[BUFLEN+1];
1148 strncpy(stripped_argname, argname, arg_len);
1149 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1150
1151 if (is_obsolete_flag(stripped_argname, &since)) {
1152 char version[256];
1153 since.to_string(version, sizeof(version));
1154 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1155 return true;
1156 }
1157 }
1158
1159 // For locked flags, report a custom error message if available.
1160 // Otherwise, report the standard unrecognized VM option.
1161 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1162 if (found_flag != NULL) {
1163 char locked_message_buf[BUFLEN];
1164 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1165 if (strlen(locked_message_buf) == 0) {
1166 if (found_flag->is_bool() && !has_plus_minus) {
1167 jio_fprintf(defaultStream::error_stream(),
1168 "Missing +/- setting for VM option '%s'\n", argname);
1169 } else if (!found_flag->is_bool() && has_plus_minus) {
1170 jio_fprintf(defaultStream::error_stream(),
1171 "Unexpected +/- setting in VM option '%s'\n", argname);
1172 } else {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "Improperly specified VM option '%s'\n", argname);
1175 }
1176 } else {
1177 #ifdef PRODUCT
1178 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1179 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1180 if (ignore_unrecognized && mismatched) {
1181 return true;
1182 }
1183 #endif
1184 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1185 }
1186 } else {
1187 if (ignore_unrecognized) {
1188 return true;
1189 }
1190 jio_fprintf(defaultStream::error_stream(),
1191 "Unrecognized VM option '%s'\n", argname);
1192 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1193 if (fuzzy_matched != NULL) {
1194 jio_fprintf(defaultStream::error_stream(),
1195 "Did you mean '%s%s%s'? ",
1196 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1197 fuzzy_matched->_name,
1198 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1199 }
1200 }
1201
1202 // allow for commandline "commenting out" options like -XX:#+Verbose
1203 return arg[0] == '#';
1204 }
1205
1206 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1207 FILE* stream = fopen(file_name, "rb");
1208 if (stream == NULL) {
1209 if (should_exist) {
1210 jio_fprintf(defaultStream::error_stream(),
1211 "Could not open settings file %s\n", file_name);
1212 return false;
1213 } else {
1214 return true;
1215 }
1216 }
1217
1218 char token[1024];
1219 int pos = 0;
1220
1221 bool in_white_space = true;
1222 bool in_comment = false;
1223 bool in_quote = false;
1224 char quote_c = 0;
1225 bool result = true;
1226
1227 int c = getc(stream);
1228 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1229 if (in_white_space) {
1230 if (in_comment) {
1231 if (c == '\n') in_comment = false;
1232 } else {
1233 if (c == '#') in_comment = true;
1234 else if (!isspace(c)) {
1235 in_white_space = false;
1236 token[pos++] = c;
1237 }
1238 }
1239 } else {
1240 if (c == '\n' || (!in_quote && isspace(c))) {
1241 // token ends at newline, or at unquoted whitespace
1242 // this allows a way to include spaces in string-valued options
1243 token[pos] = '\0';
1244 logOption(token);
1245 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1246 build_jvm_flags(token);
1247 pos = 0;
1248 in_white_space = true;
1249 in_quote = false;
1250 } else if (!in_quote && (c == '\'' || c == '"')) {
1251 in_quote = true;
1252 quote_c = c;
1253 } else if (in_quote && (c == quote_c)) {
1254 in_quote = false;
1255 } else {
1256 token[pos++] = c;
1257 }
1258 }
1259 c = getc(stream);
1260 }
1261 if (pos > 0) {
1262 token[pos] = '\0';
1263 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1264 build_jvm_flags(token);
1265 }
1266 fclose(stream);
1267 return result;
1268 }
1269
1270 //=============================================================================================================
1271 // Parsing of properties (-D)
1272
1273 const char* Arguments::get_property(const char* key) {
1274 return PropertyList_get_value(system_properties(), key);
1275 }
1276
1277 bool Arguments::add_property(const char* prop) {
1278 const char* eq = strchr(prop, '=');
1279 const char* key;
1280 const char* value = "";
1281
1282 if (eq == NULL) {
1283 // property doesn't have a value, thus use passed string
1284 key = prop;
1285 } else {
1286 // property have a value, thus extract it and save to the
1287 // allocated string
1288 size_t key_len = eq - prop;
1289 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1290
1291 strncpy(tmp_key, prop, key_len);
1292 tmp_key[key_len] = '\0';
1293 key = tmp_key;
1294
1295 value = &prop[key_len + 1];
1296 }
1297
1298 if (strcmp(key, "java.compiler") == 0) {
1299 process_java_compiler_argument(value);
1300 // Record value in Arguments, but let it get passed to Java.
1301 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1302 strcmp(key, "sun.java.launcher.pid") == 0) {
1303 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1304 // private and are processed in process_sun_java_launcher_properties();
1305 // the sun.java.launcher property is passed on to the java application
1306 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1307 PropertyList_unique_add(&_system_properties, key, value, true);
1308 } else {
1309 if (strcmp(key, "sun.java.command") == 0) {
1310 if (_java_command != NULL) {
1311 os::free(_java_command);
1312 }
1313 _java_command = os::strdup_check_oom(value, mtInternal);
1314 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1315 if (_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1316 assert(_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1317 os::free((void *)_java_vendor_url_bug);
1318 }
1319 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1320 // its value without going through the property list or making a Java call.
1321 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1322 }
1323
1324 // Create new property and add at the end of the list
1325 PropertyList_unique_add(&_system_properties, key, value);
1326 }
1327
1328 if (key != prop) {
1329 // SystemProperty copy passed value, thus free previously allocated
1330 // memory
1331 FreeHeap((void *)key);
1332 }
1333
1334 return true;
1335 }
1336
1337 //===========================================================================================================
1338 // Setting int/mixed/comp mode flags
1339
1340 void Arguments::set_mode_flags(Mode mode) {
1341 // Set up default values for all flags.
1342 // If you add a flag to any of the branches below,
1343 // add a default value for it here.
1344 set_java_compiler(false);
1345 _mode = mode;
1346
1347 // Ensure Agent_OnLoad has the correct initial values.
1348 // This may not be the final mode; mode may change later in onload phase.
1349 PropertyList_unique_add(&_system_properties, "java.vm.info",
1350 VM_Version::vm_info_string(), false);
1351
1352 UseInterpreter = true;
1353 UseCompiler = true;
1354 UseLoopCounter = true;
1355
1356 // Default values may be platform/compiler dependent -
1357 // use the saved values
1358 ClipInlining = Arguments::_ClipInlining;
1359 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1360 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1361 BackgroundCompilation = Arguments::_BackgroundCompilation;
1362 if (TieredCompilation) {
1363 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1364 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1365 }
1366 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1367 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1368 }
1369 }
1370
1371 // Change from defaults based on mode
1372 switch (mode) {
1373 default:
1374 ShouldNotReachHere();
1375 break;
1376 case _int:
1377 UseCompiler = false;
1378 UseLoopCounter = false;
1379 AlwaysCompileLoopMethods = false;
1380 UseOnStackReplacement = false;
1381 break;
1382 case _mixed:
1383 // same as default
1384 break;
1385 case _comp:
1386 UseInterpreter = false;
1387 BackgroundCompilation = false;
1388 ClipInlining = false;
1389 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1390 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1391 // compile a level 4 (C2) and then continue executing it.
1392 if (TieredCompilation) {
1393 Tier3InvokeNotifyFreqLog = 0;
1394 Tier4InvocationThreshold = 0;
1395 }
1396 break;
1397 }
1398 }
1399
1400 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1401 // Conflict: required to use shared spaces (-Xshare:on), but
1402 // incompatible command line options were chosen.
1403
1404 static void no_shared_spaces(const char* message) {
1405 if (RequireSharedSpaces) {
1406 jio_fprintf(defaultStream::error_stream(),
1407 "Class data sharing is inconsistent with other specified options.\n");
1408 vm_exit_during_initialization("Unable to use shared archive.", message);
1409 } else {
1410 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1411 }
1412 }
1413 #endif
1414
1415 // Returns threshold scaled with the value of scale.
1416 // If scale < 0.0, threshold is returned without scaling.
1417 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1418 if (scale == 1.0 || scale < 0.0) {
1419 return threshold;
1420 } else {
1421 return (intx)(threshold * scale);
1422 }
1423 }
1424
1425 // Returns freq_log scaled with the value of scale.
1426 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1427 // If scale < 0.0, freq_log is returned without scaling.
1428 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1429 // Check if scaling is necessary or if negative value was specified.
1430 if (scale == 1.0 || scale < 0.0) {
1431 return freq_log;
1432 }
1433 // Check values to avoid calculating log2 of 0.
1434 if (scale == 0.0 || freq_log == 0) {
1435 return 0;
1436 }
1437 // Determine the maximum notification frequency value currently supported.
1438 // The largest mask value that the interpreter/C1 can handle is
1439 // of length InvocationCounter::number_of_count_bits. Mask values are always
1440 // one bit shorter then the value of the notification frequency. Set
1441 // max_freq_bits accordingly.
1442 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1443 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1444 if (scaled_freq == 0) {
1445 // Return 0 right away to avoid calculating log2 of 0.
1446 return 0;
1447 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1448 return max_freq_bits;
1449 } else {
1450 return log2_intptr(scaled_freq);
1451 }
1452 }
1453
1454 void Arguments::set_tiered_flags() {
1455 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1456 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1457 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1458 }
1459 if (CompilationPolicyChoice < 2) {
1460 vm_exit_during_initialization(
1461 "Incompatible compilation policy selected", NULL);
1462 }
1463 // Increase the code cache size - tiered compiles a lot more.
1464 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1465 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1466 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1467 }
1468 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1469 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1470 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1471
1472 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1473 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1474 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1475 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1476 }
1477 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1478 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1479 }
1480 // Check consistency of code heap sizes
1481 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1482 jio_fprintf(defaultStream::error_stream(),
1483 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1484 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1485 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1486 vm_exit(1);
1487 }
1488 }
1489 }
1490 if (!UseInterpreter) { // -Xcomp
1491 Tier3InvokeNotifyFreqLog = 0;
1492 Tier4InvocationThreshold = 0;
1493 }
1494
1495 if (CompileThresholdScaling < 0) {
1496 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1497 }
1498
1499 // Scale tiered compilation thresholds.
1500 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1501 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1502 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1503 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1504
1505 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1506 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1507 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1508 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1509
1510 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1511 // once these thresholds become supported.
1512
1513 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1514 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1515
1516 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1517 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1518
1519 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1520
1521 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1522 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1523 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1524 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1525 }
1526 }
1527
1528 #if INCLUDE_ALL_GCS
1529 static void disable_adaptive_size_policy(const char* collector_name) {
1530 if (UseAdaptiveSizePolicy) {
1531 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1532 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1533 collector_name);
1534 }
1535 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1536 }
1537 }
1538
1539 void Arguments::set_parnew_gc_flags() {
1540 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1541 "control point invariant");
1542 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1543 assert(UseParNewGC, "ParNew should always be used with CMS");
1544
1545 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1546 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1547 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1548 } else if (ParallelGCThreads == 0) {
1549 jio_fprintf(defaultStream::error_stream(),
1550 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1551 vm_exit(1);
1552 }
1553
1554 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1555 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1556 // we set them to 1024 and 1024.
1557 // See CR 6362902.
1558 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1559 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1560 }
1561 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1562 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1563 }
1564
1565 // When using compressed oops, we use local overflow stacks,
1566 // rather than using a global overflow list chained through
1567 // the klass word of the object's pre-image.
1568 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1569 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1570 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1571 }
1572 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1573 }
1574 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1575 }
1576
1577 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1578 // sparc/solaris for certain applications, but would gain from
1579 // further optimization and tuning efforts, and would almost
1580 // certainly gain from analysis of platform and environment.
1581 void Arguments::set_cms_and_parnew_gc_flags() {
1582 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1583 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1584 assert(UseParNewGC, "ParNew should always be used with CMS");
1585
1586 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1587 disable_adaptive_size_policy("UseConcMarkSweepGC");
1588
1589 set_parnew_gc_flags();
1590
1591 size_t max_heap = align_size_down(MaxHeapSize,
1592 CardTableRS::ct_max_alignment_constraint());
1593
1594 // Now make adjustments for CMS
1595 intx tenuring_default = (intx)6;
1596 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1597
1598 // Preferred young gen size for "short" pauses:
1599 // upper bound depends on # of threads and NewRatio.
1600 const size_t preferred_max_new_size_unaligned =
1601 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1602 size_t preferred_max_new_size =
1603 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1604
1605 // Unless explicitly requested otherwise, size young gen
1606 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1607
1608 // If either MaxNewSize or NewRatio is set on the command line,
1609 // assume the user is trying to set the size of the young gen.
1610 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1611
1612 // Set MaxNewSize to our calculated preferred_max_new_size unless
1613 // NewSize was set on the command line and it is larger than
1614 // preferred_max_new_size.
1615 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1616 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1617 } else {
1618 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1619 }
1620 if (PrintGCDetails && Verbose) {
1621 // Too early to use gclog_or_tty
1622 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1623 }
1624
1625 // Code along this path potentially sets NewSize and OldSize
1626 if (PrintGCDetails && Verbose) {
1627 // Too early to use gclog_or_tty
1628 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1629 " initial_heap_size: " SIZE_FORMAT
1630 " max_heap: " SIZE_FORMAT,
1631 min_heap_size(), InitialHeapSize, max_heap);
1632 }
1633 size_t min_new = preferred_max_new_size;
1634 if (FLAG_IS_CMDLINE(NewSize)) {
1635 min_new = NewSize;
1636 }
1637 if (max_heap > min_new && min_heap_size() > min_new) {
1638 // Unless explicitly requested otherwise, make young gen
1639 // at least min_new, and at most preferred_max_new_size.
1640 if (FLAG_IS_DEFAULT(NewSize)) {
1641 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1642 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1643 if (PrintGCDetails && Verbose) {
1644 // Too early to use gclog_or_tty
1645 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1646 }
1647 }
1648 // Unless explicitly requested otherwise, size old gen
1649 // so it's NewRatio x of NewSize.
1650 if (FLAG_IS_DEFAULT(OldSize)) {
1651 if (max_heap > NewSize) {
1652 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1653 if (PrintGCDetails && Verbose) {
1654 // Too early to use gclog_or_tty
1655 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1656 }
1657 }
1658 }
1659 }
1660 }
1661 // Unless explicitly requested otherwise, definitely
1662 // promote all objects surviving "tenuring_default" scavenges.
1663 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1664 FLAG_IS_DEFAULT(SurvivorRatio)) {
1665 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1666 }
1667 // If we decided above (or user explicitly requested)
1668 // `promote all' (via MaxTenuringThreshold := 0),
1669 // prefer minuscule survivor spaces so as not to waste
1670 // space for (non-existent) survivors
1671 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1672 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1673 }
1674
1675 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1676 // but rather the number of free blocks of a given size that are used when
1677 // replenishing the local per-worker free list caches.
1678 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1679 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1680 // OldPLAB sizing manually turned off: Use a larger default setting,
1681 // unless it was manually specified. This is because a too-low value
1682 // will slow down scavenges.
1683 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1684 } else {
1685 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1686 }
1687 }
1688
1689 // If either of the static initialization defaults have changed, note this
1690 // modification.
1691 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1692 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1693 }
1694
1695 if (!ClassUnloading) {
1696 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1697 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1698 }
1699
1700 if (PrintGCDetails && Verbose) {
1701 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1702 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1703 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1704 }
1705 }
1706 #endif // INCLUDE_ALL_GCS
1707
1708 void set_object_alignment() {
1709 // Object alignment.
1710 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1711 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1712 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1713 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1714 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1715 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1716
1717 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1718 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1719
1720 // Oop encoding heap max
1721 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1722
1723 if (SurvivorAlignmentInBytes == 0) {
1724 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1725 }
1726
1727 #if INCLUDE_ALL_GCS
1728 // Set CMS global values
1729 CompactibleFreeListSpace::set_cms_values();
1730 #endif // INCLUDE_ALL_GCS
1731 }
1732
1733 size_t Arguments::max_heap_for_compressed_oops() {
1734 // Avoid sign flip.
1735 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1736 // We need to fit both the NULL page and the heap into the memory budget, while
1737 // keeping alignment constraints of the heap. To guarantee the latter, as the
1738 // NULL page is located before the heap, we pad the NULL page to the conservative
1739 // maximum alignment that the GC may ever impose upon the heap.
1740 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1741 _conservative_max_heap_alignment);
1742
1743 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1744 NOT_LP64(ShouldNotReachHere(); return 0);
1745 }
1746
1747 bool Arguments::should_auto_select_low_pause_collector() {
1748 if (UseAutoGCSelectPolicy &&
1749 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1750 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1751 if (PrintGCDetails) {
1752 // Cannot use gclog_or_tty yet.
1753 tty->print_cr("Automatic selection of the low pause collector"
1754 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1755 }
1756 return true;
1757 }
1758 return false;
1759 }
1760
1761 void Arguments::set_use_compressed_oops() {
1762 #ifndef ZERO
1763 #ifdef _LP64
1764 // MaxHeapSize is not set up properly at this point, but
1765 // the only value that can override MaxHeapSize if we are
1766 // to use UseCompressedOops is InitialHeapSize.
1767 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1768
1769 if (max_heap_size <= max_heap_for_compressed_oops()) {
1770 #if !defined(COMPILER1) || defined(TIERED)
1771 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1772 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1773 }
1774 #endif
1775 } else {
1776 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1777 warning("Max heap size too large for Compressed Oops");
1778 FLAG_SET_DEFAULT(UseCompressedOops, false);
1779 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1780 }
1781 }
1782 #endif // _LP64
1783 #endif // ZERO
1784 }
1785
1786
1787 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1788 // set_use_compressed_oops().
1789 void Arguments::set_use_compressed_klass_ptrs() {
1790 #ifndef ZERO
1791 #ifdef _LP64
1792 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1793 if (!UseCompressedOops) {
1794 if (UseCompressedClassPointers) {
1795 warning("UseCompressedClassPointers requires UseCompressedOops");
1796 }
1797 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1798 } else {
1799 // Turn on UseCompressedClassPointers too
1800 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1801 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1802 }
1803 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1804 if (UseCompressedClassPointers) {
1805 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1806 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1807 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1808 }
1809 }
1810 }
1811 #endif // _LP64
1812 #endif // !ZERO
1813 }
1814
1815 void Arguments::set_conservative_max_heap_alignment() {
1816 // The conservative maximum required alignment for the heap is the maximum of
1817 // the alignments imposed by several sources: any requirements from the heap
1818 // itself, the collector policy and the maximum page size we may run the VM
1819 // with.
1820 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1821 #if INCLUDE_ALL_GCS
1822 if (UseParallelGC) {
1823 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1824 } else if (UseG1GC) {
1825 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1826 }
1827 #endif // INCLUDE_ALL_GCS
1828 _conservative_max_heap_alignment = MAX4(heap_alignment,
1829 (size_t)os::vm_allocation_granularity(),
1830 os::max_page_size(),
1831 CollectorPolicy::compute_heap_alignment());
1832 }
1833
1834 void Arguments::select_gc_ergonomically() {
1835 if (os::is_server_class_machine()) {
1836 if (should_auto_select_low_pause_collector()) {
1837 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1838 } else {
1839 #if defined(JAVASE_EMBEDDED)
1840 FLAG_SET_ERGO(bool, UseParallelGC, true);
1841 #else
1842 FLAG_SET_ERGO(bool, UseG1GC, true);
1843 #endif
1844 }
1845 } else {
1846 FLAG_SET_ERGO(bool, UseSerialGC, true);
1847 }
1848 }
1849
1850 void Arguments::select_gc() {
1851 if (!gc_selected()) {
1852 select_gc_ergonomically();
1853 guarantee(gc_selected(), "No GC selected");
1854 }
1855 }
1856
1857 void Arguments::set_ergonomics_flags() {
1858 select_gc();
1859
1860 #if defined(COMPILER2) || INCLUDE_JVMCI
1861 // Shared spaces work fine with other GCs but causes bytecode rewriting
1862 // to be disabled, which hurts interpreter performance and decreases
1863 // server performance. When -server is specified, keep the default off
1864 // unless it is asked for. Future work: either add bytecode rewriting
1865 // at link time, or rewrite bytecodes in non-shared methods.
1866 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1867 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1868 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1869 }
1870 #endif
1871
1872 set_conservative_max_heap_alignment();
1873
1874 #ifndef ZERO
1875 #ifdef _LP64
1876 set_use_compressed_oops();
1877
1878 // set_use_compressed_klass_ptrs() must be called after calling
1879 // set_use_compressed_oops().
1880 set_use_compressed_klass_ptrs();
1881
1882 // Also checks that certain machines are slower with compressed oops
1883 // in vm_version initialization code.
1884 #endif // _LP64
1885 #endif // !ZERO
1886
1887 CodeCacheExtensions::set_ergonomics_flags();
1888 }
1889
1890 void Arguments::set_parallel_gc_flags() {
1891 assert(UseParallelGC || UseParallelOldGC, "Error");
1892 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1893 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1894 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1895 }
1896 FLAG_SET_DEFAULT(UseParallelGC, true);
1897
1898 // If no heap maximum was requested explicitly, use some reasonable fraction
1899 // of the physical memory, up to a maximum of 1GB.
1900 FLAG_SET_DEFAULT(ParallelGCThreads,
1901 Abstract_VM_Version::parallel_worker_threads());
1902 if (ParallelGCThreads == 0) {
1903 jio_fprintf(defaultStream::error_stream(),
1904 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1905 vm_exit(1);
1906 }
1907
1908 if (UseAdaptiveSizePolicy) {
1909 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1910 // unless the user actually sets these flags.
1911 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1912 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1913 }
1914 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1915 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1916 }
1917 }
1918
1919 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1920 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1921 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1922 // See CR 6362902 for details.
1923 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1924 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1925 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1926 }
1927 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1928 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1929 }
1930 }
1931
1932 if (UseParallelOldGC) {
1933 // Par compact uses lower default values since they are treated as
1934 // minimums. These are different defaults because of the different
1935 // interpretation and are not ergonomically set.
1936 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1937 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1938 }
1939 }
1940 }
1941
1942 void Arguments::set_g1_gc_flags() {
1943 assert(UseG1GC, "Error");
1944 #if defined(COMPILER1) || INCLUDE_JVMCI
1945 FastTLABRefill = false;
1946 #endif
1947 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1948 if (ParallelGCThreads == 0) {
1949 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1950 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1951 }
1952
1953 #if INCLUDE_ALL_GCS
1954 if (G1ConcRefinementThreads == 0) {
1955 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1956 }
1957 #endif
1958
1959 // MarkStackSize will be set (if it hasn't been set by the user)
1960 // when concurrent marking is initialized.
1961 // Its value will be based upon the number of parallel marking threads.
1962 // But we do set the maximum mark stack size here.
1963 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1964 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1965 }
1966
1967 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1968 // In G1, we want the default GC overhead goal to be higher than
1969 // say in PS. So we set it here to 10%. Otherwise the heap might
1970 // be expanded more aggressively than we would like it to. In
1971 // fact, even 10% seems to not be high enough in some cases
1972 // (especially small GC stress tests that the main thing they do
1973 // is allocation). We might consider increase it further.
1974 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1975 }
1976
1977 if (PrintGCDetails && Verbose) {
1978 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1979 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1980 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1981 }
1982 }
1983
1984 #if !INCLUDE_ALL_GCS
1985 #ifdef ASSERT
1986 static bool verify_serial_gc_flags() {
1987 return (UseSerialGC &&
1988 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1989 UseParallelGC || UseParallelOldGC));
1990 }
1991 #endif // ASSERT
1992 #endif // INCLUDE_ALL_GCS
1993
1994 void Arguments::set_gc_specific_flags() {
1995 #if INCLUDE_ALL_GCS
1996 // Set per-collector flags
1997 if (UseParallelGC || UseParallelOldGC) {
1998 set_parallel_gc_flags();
1999 } else if (UseConcMarkSweepGC) {
2000 set_cms_and_parnew_gc_flags();
2001 } else if (UseG1GC) {
2002 set_g1_gc_flags();
2003 }
2004 if (AssumeMP && !UseSerialGC) {
2005 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2006 warning("If the number of processors is expected to increase from one, then"
2007 " you should configure the number of parallel GC threads appropriately"
2008 " using -XX:ParallelGCThreads=N");
2009 }
2010 }
2011 if (MinHeapFreeRatio == 100) {
2012 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2013 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2014 }
2015 #else // INCLUDE_ALL_GCS
2016 assert(verify_serial_gc_flags(), "SerialGC unset");
2017 #endif // INCLUDE_ALL_GCS
2018 }
2019
2020 julong Arguments::limit_by_allocatable_memory(julong limit) {
2021 julong max_allocatable;
2022 julong result = limit;
2023 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2024 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2025 }
2026 return result;
2027 }
2028
2029 // Use static initialization to get the default before parsing
2030 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2031
2032 void Arguments::set_heap_size() {
2033 const julong phys_mem =
2034 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2035 : (julong)MaxRAM;
2036
2037 // If the maximum heap size has not been set with -Xmx,
2038 // then set it as fraction of the size of physical memory,
2039 // respecting the maximum and minimum sizes of the heap.
2040 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2041 julong reasonable_max = phys_mem / MaxRAMFraction;
2042
2043 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2044 // Small physical memory, so use a minimum fraction of it for the heap
2045 reasonable_max = phys_mem / MinRAMFraction;
2046 } else {
2047 // Not-small physical memory, so require a heap at least
2048 // as large as MaxHeapSize
2049 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2050 }
2051 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2052 // Limit the heap size to ErgoHeapSizeLimit
2053 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2054 }
2055 if (UseCompressedOops) {
2056 // Limit the heap size to the maximum possible when using compressed oops
2057 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2058
2059 // HeapBaseMinAddress can be greater than default but not less than.
2060 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2061 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2062 // matches compressed oops printing flags
2063 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2064 jio_fprintf(defaultStream::error_stream(),
2065 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2066 " (" SIZE_FORMAT "G) which is greater than value given "
2067 SIZE_FORMAT "\n",
2068 DefaultHeapBaseMinAddress,
2069 DefaultHeapBaseMinAddress/G,
2070 HeapBaseMinAddress);
2071 }
2072 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2073 }
2074 }
2075
2076 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2077 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2078 // but it should be not less than default MaxHeapSize.
2079 max_coop_heap -= HeapBaseMinAddress;
2080 }
2081 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2082 }
2083 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2084
2085 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2086 // An initial heap size was specified on the command line,
2087 // so be sure that the maximum size is consistent. Done
2088 // after call to limit_by_allocatable_memory because that
2089 // method might reduce the allocation size.
2090 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2091 }
2092
2093 if (PrintGCDetails && Verbose) {
2094 // Cannot use gclog_or_tty yet.
2095 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2096 }
2097 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2098 }
2099
2100 // If the minimum or initial heap_size have not been set or requested to be set
2101 // ergonomically, set them accordingly.
2102 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2103 julong reasonable_minimum = (julong)(OldSize + NewSize);
2104
2105 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2106
2107 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2108
2109 if (InitialHeapSize == 0) {
2110 julong reasonable_initial = phys_mem / InitialRAMFraction;
2111
2112 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2113 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2114
2115 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2116
2117 if (PrintGCDetails && Verbose) {
2118 // Cannot use gclog_or_tty yet.
2119 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2120 }
2121 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2122 }
2123 // If the minimum heap size has not been set (via -Xms),
2124 // synchronize with InitialHeapSize to avoid errors with the default value.
2125 if (min_heap_size() == 0) {
2126 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2127 if (PrintGCDetails && Verbose) {
2128 // Cannot use gclog_or_tty yet.
2129 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2130 }
2131 }
2132 }
2133 }
2134
2135 // This option inspects the machine and attempts to set various
2136 // parameters to be optimal for long-running, memory allocation
2137 // intensive jobs. It is intended for machines with large
2138 // amounts of cpu and memory.
2139 jint Arguments::set_aggressive_heap_flags() {
2140 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2141 // VM, but we may not be able to represent the total physical memory
2142 // available (like having 8gb of memory on a box but using a 32bit VM).
2143 // Thus, we need to make sure we're using a julong for intermediate
2144 // calculations.
2145 julong initHeapSize;
2146 julong total_memory = os::physical_memory();
2147
2148 if (total_memory < (julong) 256 * M) {
2149 jio_fprintf(defaultStream::error_stream(),
2150 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2151 vm_exit(1);
2152 }
2153
2154 // The heap size is half of available memory, or (at most)
2155 // all of possible memory less 160mb (leaving room for the OS
2156 // when using ISM). This is the maximum; because adaptive sizing
2157 // is turned on below, the actual space used may be smaller.
2158
2159 initHeapSize = MIN2(total_memory / (julong) 2,
2160 total_memory - (julong) 160 * M);
2161
2162 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2163
2164 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2165 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2166 return JNI_EINVAL;
2167 }
2168 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2169 return JNI_EINVAL;
2170 }
2171 // Currently the minimum size and the initial heap sizes are the same.
2172 set_min_heap_size(initHeapSize);
2173 }
2174 if (FLAG_IS_DEFAULT(NewSize)) {
2175 // Make the young generation 3/8ths of the total heap.
2176 if (FLAG_SET_CMDLINE(size_t, NewSize,
2177 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2178 return JNI_EINVAL;
2179 }
2180 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2181 return JNI_EINVAL;
2182 }
2183 }
2184
2185 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2186 FLAG_SET_DEFAULT(UseLargePages, true);
2187 #endif
2188
2189 // Increase some data structure sizes for efficiency
2190 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2191 return JNI_EINVAL;
2192 }
2193 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2194 return JNI_EINVAL;
2195 }
2196 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2197 return JNI_EINVAL;
2198 }
2199
2200 // See the OldPLABSize comment below, but replace 'after promotion'
2201 // with 'after copying'. YoungPLABSize is the size of the survivor
2202 // space per-gc-thread buffers. The default is 4kw.
2203 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2204 return JNI_EINVAL;
2205 }
2206
2207 // OldPLABSize is the size of the buffers in the old gen that
2208 // UseParallelGC uses to promote live data that doesn't fit in the
2209 // survivor spaces. At any given time, there's one for each gc thread.
2210 // The default size is 1kw. These buffers are rarely used, since the
2211 // survivor spaces are usually big enough. For specjbb, however, there
2212 // are occasions when there's lots of live data in the young gen
2213 // and we end up promoting some of it. We don't have a definite
2214 // explanation for why bumping OldPLABSize helps, but the theory
2215 // is that a bigger PLAB results in retaining something like the
2216 // original allocation order after promotion, which improves mutator
2217 // locality. A minor effect may be that larger PLABs reduce the
2218 // number of PLAB allocation events during gc. The value of 8kw
2219 // was arrived at by experimenting with specjbb.
2220 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2221 return JNI_EINVAL;
2222 }
2223
2224 // Enable parallel GC and adaptive generation sizing
2225 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2226 return JNI_EINVAL;
2227 }
2228 FLAG_SET_DEFAULT(ParallelGCThreads,
2229 Abstract_VM_Version::parallel_worker_threads());
2230
2231 // Encourage steady state memory management
2232 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2233 return JNI_EINVAL;
2234 }
2235
2236 // This appears to improve mutator locality
2237 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2238 return JNI_EINVAL;
2239 }
2240
2241 // Get around early Solaris scheduling bug
2242 // (affinity vs other jobs on system)
2243 // but disallow DR and offlining (5008695).
2244 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2245 return JNI_EINVAL;
2246 }
2247
2248 return JNI_OK;
2249 }
2250
2251 // This must be called after ergonomics.
2252 void Arguments::set_bytecode_flags() {
2253 if (!RewriteBytecodes) {
2254 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2255 }
2256 }
2257
2258 // Aggressive optimization flags -XX:+AggressiveOpts
2259 jint Arguments::set_aggressive_opts_flags() {
2260 #ifdef COMPILER2
2261 if (AggressiveUnboxing) {
2262 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2263 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2264 } else if (!EliminateAutoBox) {
2265 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2266 AggressiveUnboxing = false;
2267 }
2268 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2269 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2270 } else if (!DoEscapeAnalysis) {
2271 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2272 AggressiveUnboxing = false;
2273 }
2274 }
2275 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2276 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2277 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2278 }
2279 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2280 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2281 }
2282
2283 // Feed the cache size setting into the JDK
2284 char buffer[1024];
2285 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2286 if (!add_property(buffer)) {
2287 return JNI_ENOMEM;
2288 }
2289 }
2290 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2291 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2292 }
2293 #endif
2294
2295 if (AggressiveOpts) {
2296 // Sample flag setting code
2297 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2298 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2299 // }
2300 }
2301
2302 return JNI_OK;
2303 }
2304
2305 //===========================================================================================================
2306 // Parsing of java.compiler property
2307
2308 void Arguments::process_java_compiler_argument(const char* arg) {
2309 // For backwards compatibility, Djava.compiler=NONE or ""
2310 // causes us to switch to -Xint mode UNLESS -Xdebug
2311 // is also specified.
2312 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2313 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2314 }
2315 }
2316
2317 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2318 _sun_java_launcher = os::strdup_check_oom(launcher);
2319 }
2320
2321 bool Arguments::created_by_java_launcher() {
2322 assert(_sun_java_launcher != NULL, "property must have value");
2323 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2324 }
2325
2326 bool Arguments::sun_java_launcher_is_altjvm() {
2327 return _sun_java_launcher_is_altjvm;
2328 }
2329
2330 //===========================================================================================================
2331 // Parsing of main arguments
2332
2333 // check if do gclog rotation
2334 // +UseGCLogFileRotation is a must,
2335 // no gc log rotation when log file not supplied or
2336 // NumberOfGCLogFiles is 0
2337 void check_gclog_consistency() {
2338 if (UseGCLogFileRotation) {
2339 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2340 jio_fprintf(defaultStream::output_stream(),
2341 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2342 "where num_of_file > 0\n"
2343 "GC log rotation is turned off\n");
2344 UseGCLogFileRotation = false;
2345 }
2346 }
2347
2348 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2349 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
2350 jio_fprintf(defaultStream::output_stream(),
2351 "GCLogFileSize changed to minimum 8K\n");
2352 }
2353 }
2354 }
2355
2356 // This function is called for -Xloggc:<filename>, it can be used
2357 // to check if a given file name(or string) conforms to the following
2358 // specification:
2359 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2360 // %p and %t only allowed once. We only limit usage of filename not path
2361 bool is_filename_valid(const char *file_name) {
2362 const char* p = file_name;
2363 char file_sep = os::file_separator()[0];
2364 const char* cp;
2365 // skip prefix path
2366 for (cp = file_name; *cp != '\0'; cp++) {
2367 if (*cp == '/' || *cp == file_sep) {
2368 p = cp + 1;
2369 }
2370 }
2371
2372 int count_p = 0;
2373 int count_t = 0;
2374 while (*p != '\0') {
2375 if ((*p >= '0' && *p <= '9') ||
2376 (*p >= 'A' && *p <= 'Z') ||
2377 (*p >= 'a' && *p <= 'z') ||
2378 *p == '-' ||
2379 *p == '_' ||
2380 *p == '.') {
2381 p++;
2382 continue;
2383 }
2384 if (*p == '%') {
2385 if(*(p + 1) == 'p') {
2386 p += 2;
2387 count_p ++;
2388 continue;
2389 }
2390 if (*(p + 1) == 't') {
2391 p += 2;
2392 count_t ++;
2393 continue;
2394 }
2395 }
2396 return false;
2397 }
2398 return count_p < 2 && count_t < 2;
2399 }
2400
2401 // Check consistency of GC selection
2402 bool Arguments::check_gc_consistency() {
2403 check_gclog_consistency();
2404 // Ensure that the user has not selected conflicting sets
2405 // of collectors.
2406 uint i = 0;
2407 if (UseSerialGC) i++;
2408 if (UseConcMarkSweepGC) i++;
2409 if (UseParallelGC || UseParallelOldGC) i++;
2410 if (UseG1GC) i++;
2411 if (i > 1) {
2412 jio_fprintf(defaultStream::error_stream(),
2413 "Conflicting collector combinations in option list; "
2414 "please refer to the release notes for the combinations "
2415 "allowed\n");
2416 return false;
2417 }
2418
2419 if (UseConcMarkSweepGC && !UseParNewGC) {
2420 jio_fprintf(defaultStream::error_stream(),
2421 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2422 return false;
2423 }
2424
2425 if (UseParNewGC && !UseConcMarkSweepGC) {
2426 jio_fprintf(defaultStream::error_stream(),
2427 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2428 return false;
2429 }
2430
2431 return true;
2432 }
2433
2434 // Check the consistency of vm_init_args
2435 bool Arguments::check_vm_args_consistency() {
2436 // Method for adding checks for flag consistency.
2437 // The intent is to warn the user of all possible conflicts,
2438 // before returning an error.
2439 // Note: Needs platform-dependent factoring.
2440 bool status = true;
2441
2442 if (TLABRefillWasteFraction == 0) {
2443 jio_fprintf(defaultStream::error_stream(),
2444 "TLABRefillWasteFraction should be a denominator, "
2445 "not " SIZE_FORMAT "\n",
2446 TLABRefillWasteFraction);
2447 status = false;
2448 }
2449
2450 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2451 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2452 }
2453
2454 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2455 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2456 }
2457
2458 if (GCTimeLimit == 100) {
2459 // Turn off gc-overhead-limit-exceeded checks
2460 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2461 }
2462
2463 status = status && check_gc_consistency();
2464
2465 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2466 // insists that we hold the requisite locks so that the iteration is
2467 // MT-safe. For the verification at start-up and shut-down, we don't
2468 // yet have a good way of acquiring and releasing these locks,
2469 // which are not visible at the CollectedHeap level. We want to
2470 // be able to acquire these locks and then do the iteration rather
2471 // than just disable the lock verification. This will be fixed under
2472 // bug 4788986.
2473 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2474 if (VerifyDuringStartup) {
2475 warning("Heap verification at start-up disabled "
2476 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2477 VerifyDuringStartup = false; // Disable verification at start-up
2478 }
2479
2480 if (VerifyBeforeExit) {
2481 warning("Heap verification at shutdown disabled "
2482 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2483 VerifyBeforeExit = false; // Disable verification at shutdown
2484 }
2485 }
2486
2487 if (PrintNMTStatistics) {
2488 #if INCLUDE_NMT
2489 if (MemTracker::tracking_level() == NMT_off) {
2490 #endif // INCLUDE_NMT
2491 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2492 PrintNMTStatistics = false;
2493 #if INCLUDE_NMT
2494 }
2495 #endif
2496 }
2497 #if INCLUDE_JVMCI
2498 if (EnableJVMCI) {
2499 if (!ScavengeRootsInCode) {
2500 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2501 ScavengeRootsInCode = 1;
2502 }
2503 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2504 TypeProfileLevel = 0;
2505 }
2506 if (UseJVMCICompiler) {
2507 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2508 TypeProfileWidth = 8;
2509 }
2510 }
2511 }
2512 #endif
2513
2514 // Check lower bounds of the code cache
2515 // Template Interpreter code is approximately 3X larger in debug builds.
2516 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2517 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2518 jio_fprintf(defaultStream::error_stream(),
2519 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2520 os::vm_page_size()/K);
2521 status = false;
2522 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2523 jio_fprintf(defaultStream::error_stream(),
2524 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2525 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2526 status = false;
2527 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2528 jio_fprintf(defaultStream::error_stream(),
2529 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2530 min_code_cache_size/K);
2531 status = false;
2532 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2533 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2534 jio_fprintf(defaultStream::error_stream(),
2535 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2536 CODE_CACHE_SIZE_LIMIT/M);
2537 status = false;
2538 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2539 jio_fprintf(defaultStream::error_stream(),
2540 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2541 min_code_cache_size/K);
2542 status = false;
2543 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2544 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2545 jio_fprintf(defaultStream::error_stream(),
2546 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2547 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2548 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2549 status = false;
2550 }
2551
2552 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2553 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2554 }
2555
2556 return status;
2557 }
2558
2559 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2560 const char* option_type) {
2561 if (ignore) return false;
2562
2563 const char* spacer = " ";
2564 if (option_type == NULL) {
2565 option_type = ++spacer; // Set both to the empty string.
2566 }
2567
2568 if (os::obsolete_option(option)) {
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Obsolete %s%soption: %s\n", option_type, spacer,
2571 option->optionString);
2572 return false;
2573 } else {
2574 jio_fprintf(defaultStream::error_stream(),
2575 "Unrecognized %s%soption: %s\n", option_type, spacer,
2576 option->optionString);
2577 return true;
2578 }
2579 }
2580
2581 static const char* user_assertion_options[] = {
2582 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2583 };
2584
2585 static const char* system_assertion_options[] = {
2586 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2587 };
2588
2589 bool Arguments::parse_uintx(const char* value,
2590 uintx* uintx_arg,
2591 uintx min_size) {
2592
2593 // Check the sign first since atomull() parses only unsigned values.
2594 bool value_is_positive = !(*value == '-');
2595
2596 if (value_is_positive) {
2597 julong n;
2598 bool good_return = atomull(value, &n);
2599 if (good_return) {
2600 bool above_minimum = n >= min_size;
2601 bool value_is_too_large = n > max_uintx;
2602
2603 if (above_minimum && !value_is_too_large) {
2604 *uintx_arg = n;
2605 return true;
2606 }
2607 }
2608 }
2609 return false;
2610 }
2611
2612 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2613 julong* long_arg,
2614 julong min_size) {
2615 if (!atomull(s, long_arg)) return arg_unreadable;
2616 return check_memory_size(*long_arg, min_size);
2617 }
2618
2619 // Parse JavaVMInitArgs structure
2620
2621 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2622 const JavaVMInitArgs *java_options_args,
2623 const JavaVMInitArgs *cmd_line_args) {
2624 // For components of the system classpath.
2625 SysClassPath scp(Arguments::get_sysclasspath());
2626 bool scp_assembly_required = false;
2627
2628 // Save default settings for some mode flags
2629 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2630 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2631 Arguments::_ClipInlining = ClipInlining;
2632 Arguments::_BackgroundCompilation = BackgroundCompilation;
2633 if (TieredCompilation) {
2634 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2635 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2636 }
2637
2638 // Setup flags for mixed which is the default
2639 set_mode_flags(_mixed);
2640
2641 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2642 // variable (if present).
2643 jint result = parse_each_vm_init_arg(
2644 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2645 if (result != JNI_OK) {
2646 return result;
2647 }
2648
2649 // Parse args structure generated from the command line flags.
2650 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2651 Flag::COMMAND_LINE);
2652 if (result != JNI_OK) {
2653 return result;
2654 }
2655
2656 // Parse args structure generated from the _JAVA_OPTIONS environment
2657 // variable (if present) (mimics classic VM)
2658 result = parse_each_vm_init_arg(
2659 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2660 if (result != JNI_OK) {
2661 return result;
2662 }
2663
2664 // Do final processing now that all arguments have been parsed
2665 result = finalize_vm_init_args(&scp, scp_assembly_required);
2666 if (result != JNI_OK) {
2667 return result;
2668 }
2669
2670 return JNI_OK;
2671 }
2672
2673 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2674 // represents a valid JDWP agent. is_path==true denotes that we
2675 // are dealing with -agentpath (case where name is a path), otherwise with
2676 // -agentlib
2677 bool valid_jdwp_agent(char *name, bool is_path) {
2678 char *_name;
2679 const char *_jdwp = "jdwp";
2680 size_t _len_jdwp, _len_prefix;
2681
2682 if (is_path) {
2683 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2684 return false;
2685 }
2686
2687 _name++; // skip past last path separator
2688 _len_prefix = strlen(JNI_LIB_PREFIX);
2689
2690 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2691 return false;
2692 }
2693
2694 _name += _len_prefix;
2695 _len_jdwp = strlen(_jdwp);
2696
2697 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2698 _name += _len_jdwp;
2699 }
2700 else {
2701 return false;
2702 }
2703
2704 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2705 return false;
2706 }
2707
2708 return true;
2709 }
2710
2711 if (strcmp(name, _jdwp) == 0) {
2712 return true;
2713 }
2714
2715 return false;
2716 }
2717
2718 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2719 SysClassPath* scp_p,
2720 bool* scp_assembly_required_p,
2721 Flag::Flags origin) {
2722 // Remaining part of option string
2723 const char* tail;
2724
2725 // iterate over arguments
2726 for (int index = 0; index < args->nOptions; index++) {
2727 bool is_absolute_path = false; // for -agentpath vs -agentlib
2728
2729 const JavaVMOption* option = args->options + index;
2730
2731 if (!match_option(option, "-Djava.class.path", &tail) &&
2732 !match_option(option, "-Dsun.java.command", &tail) &&
2733 !match_option(option, "-Dsun.java.launcher", &tail)) {
2734
2735 // add all jvm options to the jvm_args string. This string
2736 // is used later to set the java.vm.args PerfData string constant.
2737 // the -Djava.class.path and the -Dsun.java.command options are
2738 // omitted from jvm_args string as each have their own PerfData
2739 // string constant object.
2740 build_jvm_args(option->optionString);
2741 }
2742
2743 // -verbose:[class/gc/jni]
2744 if (match_option(option, "-verbose", &tail)) {
2745 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2746 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 } else if (!strcmp(tail, ":gc")) {
2753 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2754 return JNI_EINVAL;
2755 }
2756 } else if (!strcmp(tail, ":jni")) {
2757 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 }
2761 // -da / -ea / -disableassertions / -enableassertions
2762 // These accept an optional class/package name separated by a colon, e.g.,
2763 // -da:java.lang.Thread.
2764 } else if (match_option(option, user_assertion_options, &tail, true)) {
2765 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2766 if (*tail == '\0') {
2767 JavaAssertions::setUserClassDefault(enable);
2768 } else {
2769 assert(*tail == ':', "bogus match by match_option()");
2770 JavaAssertions::addOption(tail + 1, enable);
2771 }
2772 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2773 } else if (match_option(option, system_assertion_options, &tail, false)) {
2774 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2775 JavaAssertions::setSystemClassDefault(enable);
2776 // -bootclasspath:
2777 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2778 scp_p->reset_path(tail);
2779 *scp_assembly_required_p = true;
2780 // -bootclasspath/a:
2781 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2782 scp_p->add_suffix(tail);
2783 *scp_assembly_required_p = true;
2784 // -bootclasspath/p:
2785 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2786 scp_p->add_prefix(tail);
2787 *scp_assembly_required_p = true;
2788 // -Xrun
2789 } else if (match_option(option, "-Xrun", &tail)) {
2790 if (tail != NULL) {
2791 const char* pos = strchr(tail, ':');
2792 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2793 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2794 name[len] = '\0';
2795
2796 char *options = NULL;
2797 if(pos != NULL) {
2798 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2799 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2800 }
2801 #if !INCLUDE_JVMTI
2802 if (strcmp(name, "jdwp") == 0) {
2803 jio_fprintf(defaultStream::error_stream(),
2804 "Debugging agents are not supported in this VM\n");
2805 return JNI_ERR;
2806 }
2807 #endif // !INCLUDE_JVMTI
2808 add_init_library(name, options);
2809 }
2810 // -agentlib and -agentpath
2811 } else if (match_option(option, "-agentlib:", &tail) ||
2812 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2813 if(tail != NULL) {
2814 const char* pos = strchr(tail, '=');
2815 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2816 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2817 name[len] = '\0';
2818
2819 char *options = NULL;
2820 if(pos != NULL) {
2821 options = os::strdup_check_oom(pos + 1, mtInternal);
2822 }
2823 #if !INCLUDE_JVMTI
2824 if (valid_jdwp_agent(name, is_absolute_path)) {
2825 jio_fprintf(defaultStream::error_stream(),
2826 "Debugging agents are not supported in this VM\n");
2827 return JNI_ERR;
2828 }
2829 #endif // !INCLUDE_JVMTI
2830 add_init_agent(name, options, is_absolute_path);
2831 }
2832 // -javaagent
2833 } else if (match_option(option, "-javaagent:", &tail)) {
2834 #if !INCLUDE_JVMTI
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Instrumentation agents are not supported in this VM\n");
2837 return JNI_ERR;
2838 #else
2839 if(tail != NULL) {
2840 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2841 add_init_agent("instrument", options, false);
2842 }
2843 #endif // !INCLUDE_JVMTI
2844 // -Xnoclassgc
2845 } else if (match_option(option, "-Xnoclassgc")) {
2846 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2847 return JNI_EINVAL;
2848 }
2849 // -Xconcgc
2850 } else if (match_option(option, "-Xconcgc")) {
2851 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2852 return JNI_EINVAL;
2853 }
2854 // -Xnoconcgc
2855 } else if (match_option(option, "-Xnoconcgc")) {
2856 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2857 return JNI_EINVAL;
2858 }
2859 // -Xbatch
2860 } else if (match_option(option, "-Xbatch")) {
2861 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2862 return JNI_EINVAL;
2863 }
2864 // -Xmn for compatibility with other JVM vendors
2865 } else if (match_option(option, "-Xmn", &tail)) {
2866 julong long_initial_young_size = 0;
2867 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2868 if (errcode != arg_in_range) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Invalid initial young generation size: %s\n", option->optionString);
2871 describe_range_error(errcode);
2872 return JNI_EINVAL;
2873 }
2874 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2875 return JNI_EINVAL;
2876 }
2877 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 // -Xms
2881 } else if (match_option(option, "-Xms", &tail)) {
2882 julong long_initial_heap_size = 0;
2883 // an initial heap size of 0 means automatically determine
2884 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2885 if (errcode != arg_in_range) {
2886 jio_fprintf(defaultStream::error_stream(),
2887 "Invalid initial heap size: %s\n", option->optionString);
2888 describe_range_error(errcode);
2889 return JNI_EINVAL;
2890 }
2891 set_min_heap_size((size_t)long_initial_heap_size);
2892 // Currently the minimum size and the initial heap sizes are the same.
2893 // Can be overridden with -XX:InitialHeapSize.
2894 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2895 return JNI_EINVAL;
2896 }
2897 // -Xmx
2898 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2899 julong long_max_heap_size = 0;
2900 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2901 if (errcode != arg_in_range) {
2902 jio_fprintf(defaultStream::error_stream(),
2903 "Invalid maximum heap size: %s\n", option->optionString);
2904 describe_range_error(errcode);
2905 return JNI_EINVAL;
2906 }
2907 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 // Xmaxf
2911 } else if (match_option(option, "-Xmaxf", &tail)) {
2912 char* err;
2913 int maxf = (int)(strtod(tail, &err) * 100);
2914 if (*err != '\0' || *tail == '\0') {
2915 jio_fprintf(defaultStream::error_stream(),
2916 "Bad max heap free percentage size: %s\n",
2917 option->optionString);
2918 return JNI_EINVAL;
2919 } else {
2920 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2921 return JNI_EINVAL;
2922 }
2923 }
2924 // Xminf
2925 } else if (match_option(option, "-Xminf", &tail)) {
2926 char* err;
2927 int minf = (int)(strtod(tail, &err) * 100);
2928 if (*err != '\0' || *tail == '\0') {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Bad min heap free percentage size: %s\n",
2931 option->optionString);
2932 return JNI_EINVAL;
2933 } else {
2934 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 }
2938 // -Xss
2939 } else if (match_option(option, "-Xss", &tail)) {
2940 julong long_ThreadStackSize = 0;
2941 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2942 if (errcode != arg_in_range) {
2943 jio_fprintf(defaultStream::error_stream(),
2944 "Invalid thread stack size: %s\n", option->optionString);
2945 describe_range_error(errcode);
2946 return JNI_EINVAL;
2947 }
2948 // Internally track ThreadStackSize in units of 1024 bytes.
2949 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2950 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2954 } else if (match_option(option, "-Xoss", &tail) ||
2955 match_option(option, "-Xsqnopause") ||
2956 match_option(option, "-Xoptimize") ||
2957 match_option(option, "-Xboundthreads") ||
2958 match_option(option, "-Xusealtsigs")) {
2959 // All these options are deprecated in JDK 9 and will be removed in a future release
2960 char version[256];
2961 JDK_Version::jdk(9).to_string(version, sizeof(version));
2962 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2963 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2964 julong long_CodeCacheExpansionSize = 0;
2965 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2966 if (errcode != arg_in_range) {
2967 jio_fprintf(defaultStream::error_stream(),
2968 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2969 os::vm_page_size()/K);
2970 return JNI_EINVAL;
2971 }
2972 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2973 return JNI_EINVAL;
2974 }
2975 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2976 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2977 julong long_ReservedCodeCacheSize = 0;
2978
2979 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2980 if (errcode != arg_in_range) {
2981 jio_fprintf(defaultStream::error_stream(),
2982 "Invalid maximum code cache size: %s.\n", option->optionString);
2983 return JNI_EINVAL;
2984 }
2985 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2986 return JNI_EINVAL;
2987 }
2988 // -XX:NonNMethodCodeHeapSize=
2989 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2990 julong long_NonNMethodCodeHeapSize = 0;
2991
2992 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2993 if (errcode != arg_in_range) {
2994 jio_fprintf(defaultStream::error_stream(),
2995 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2996 return JNI_EINVAL;
2997 }
2998 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2999 return JNI_EINVAL;
3000 }
3001 // -XX:ProfiledCodeHeapSize=
3002 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3003 julong long_ProfiledCodeHeapSize = 0;
3004
3005 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3006 if (errcode != arg_in_range) {
3007 jio_fprintf(defaultStream::error_stream(),
3008 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3009 return JNI_EINVAL;
3010 }
3011 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3012 return JNI_EINVAL;
3013 }
3014 // -XX:NonProfiledCodeHeapSizee=
3015 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3016 julong long_NonProfiledCodeHeapSize = 0;
3017
3018 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3019 if (errcode != arg_in_range) {
3020 jio_fprintf(defaultStream::error_stream(),
3021 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3022 return JNI_EINVAL;
3023 }
3024 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 // -green
3028 } else if (match_option(option, "-green")) {
3029 jio_fprintf(defaultStream::error_stream(),
3030 "Green threads support not available\n");
3031 return JNI_EINVAL;
3032 // -native
3033 } else if (match_option(option, "-native")) {
3034 // HotSpot always uses native threads, ignore silently for compatibility
3035 // -Xrs
3036 } else if (match_option(option, "-Xrs")) {
3037 // Classic/EVM option, new functionality
3038 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 // -Xprof
3042 } else if (match_option(option, "-Xprof")) {
3043 #if INCLUDE_FPROF
3044 _has_profile = true;
3045 #else // INCLUDE_FPROF
3046 jio_fprintf(defaultStream::error_stream(),
3047 "Flat profiling is not supported in this VM.\n");
3048 return JNI_ERR;
3049 #endif // INCLUDE_FPROF
3050 // -Xconcurrentio
3051 } else if (match_option(option, "-Xconcurrentio")) {
3052 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3053 return JNI_EINVAL;
3054 }
3055 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3056 return JNI_EINVAL;
3057 }
3058 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3059 return JNI_EINVAL;
3060 }
3061 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3062 return JNI_EINVAL;
3063 }
3064 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3065 return JNI_EINVAL;
3066 }
3067
3068 // -Xinternalversion
3069 } else if (match_option(option, "-Xinternalversion")) {
3070 jio_fprintf(defaultStream::output_stream(), "%s\n",
3071 VM_Version::internal_vm_info_string());
3072 vm_exit(0);
3073 #ifndef PRODUCT
3074 // -Xprintflags
3075 } else if (match_option(option, "-Xprintflags")) {
3076 CommandLineFlags::printFlags(tty, false);
3077 vm_exit(0);
3078 #endif
3079 // -D
3080 } else if (match_option(option, "-D", &tail)) {
3081 const char* value;
3082 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3083 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3084 // abort if -Djava.endorsed.dirs is set
3085 jio_fprintf(defaultStream::output_stream(),
3086 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3087 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3088 return JNI_EINVAL;
3089 }
3090 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3091 *value != '\0' && strcmp(value, "\"\"") != 0) {
3092 // abort if -Djava.ext.dirs is set
3093 jio_fprintf(defaultStream::output_stream(),
3094 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3095 return JNI_EINVAL;
3096 }
3097
3098 if (!add_property(tail)) {
3099 return JNI_ENOMEM;
3100 }
3101 // Out of the box management support
3102 if (match_option(option, "-Dcom.sun.management", &tail)) {
3103 #if INCLUDE_MANAGEMENT
3104 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3105 return JNI_EINVAL;
3106 }
3107 #else
3108 jio_fprintf(defaultStream::output_stream(),
3109 "-Dcom.sun.management is not supported in this VM.\n");
3110 return JNI_ERR;
3111 #endif
3112 }
3113 // -Xint
3114 } else if (match_option(option, "-Xint")) {
3115 set_mode_flags(_int);
3116 // -Xmixed
3117 } else if (match_option(option, "-Xmixed")) {
3118 set_mode_flags(_mixed);
3119 // -Xcomp
3120 } else if (match_option(option, "-Xcomp")) {
3121 // for testing the compiler; turn off all flags that inhibit compilation
3122 set_mode_flags(_comp);
3123 // -Xshare:dump
3124 } else if (match_option(option, "-Xshare:dump")) {
3125 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3126 return JNI_EINVAL;
3127 }
3128 set_mode_flags(_int); // Prevent compilation, which creates objects
3129 // -Xshare:on
3130 } else if (match_option(option, "-Xshare:on")) {
3131 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3132 return JNI_EINVAL;
3133 }
3134 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3135 return JNI_EINVAL;
3136 }
3137 // -Xshare:auto
3138 } else if (match_option(option, "-Xshare:auto")) {
3139 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3140 return JNI_EINVAL;
3141 }
3142 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3143 return JNI_EINVAL;
3144 }
3145 // -Xshare:off
3146 } else if (match_option(option, "-Xshare:off")) {
3147 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3148 return JNI_EINVAL;
3149 }
3150 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3151 return JNI_EINVAL;
3152 }
3153 // -Xverify
3154 } else if (match_option(option, "-Xverify", &tail)) {
3155 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3156 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3157 return JNI_EINVAL;
3158 }
3159 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 } else if (strcmp(tail, ":remote") == 0) {
3163 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3164 return JNI_EINVAL;
3165 }
3166 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3167 return JNI_EINVAL;
3168 }
3169 } else if (strcmp(tail, ":none") == 0) {
3170 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3171 return JNI_EINVAL;
3172 }
3173 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3174 return JNI_EINVAL;
3175 }
3176 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3177 return JNI_EINVAL;
3178 }
3179 // -Xdebug
3180 } else if (match_option(option, "-Xdebug")) {
3181 // note this flag has been used, then ignore
3182 set_xdebug_mode(true);
3183 // -Xnoagent
3184 } else if (match_option(option, "-Xnoagent")) {
3185 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3186 } else if (match_option(option, "-Xloggc:", &tail)) {
3187 // Redirect GC output to the file. -Xloggc:<filename>
3188 // ostream_init_log(), when called will use this filename
3189 // to initialize a fileStream.
3190 _gc_log_filename = os::strdup_check_oom(tail);
3191 if (!is_filename_valid(_gc_log_filename)) {
3192 jio_fprintf(defaultStream::output_stream(),
3193 "Invalid file name for use with -Xloggc: Filename can only contain the "
3194 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3195 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3196 return JNI_EINVAL;
3197 }
3198 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 } else if (match_option(option, "-Xlog", &tail)) {
3205 bool ret = false;
3206 if (strcmp(tail, ":help") == 0) {
3207 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3208 vm_exit(0);
3209 } else if (strcmp(tail, ":disable") == 0) {
3210 LogConfiguration::disable_logging();
3211 ret = true;
3212 } else if (*tail == '\0') {
3213 ret = LogConfiguration::parse_command_line_arguments();
3214 assert(ret, "-Xlog without arguments should never fail to parse");
3215 } else if (*tail == ':') {
3216 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3217 }
3218 if (ret == false) {
3219 jio_fprintf(defaultStream::error_stream(),
3220 "Invalid -Xlog option '-Xlog%s'\n",
3221 tail);
3222 return JNI_EINVAL;
3223 }
3224 // JNI hooks
3225 } else if (match_option(option, "-Xcheck", &tail)) {
3226 if (!strcmp(tail, ":jni")) {
3227 #if !INCLUDE_JNI_CHECK
3228 warning("JNI CHECKING is not supported in this VM");
3229 #else
3230 CheckJNICalls = true;
3231 #endif // INCLUDE_JNI_CHECK
3232 } else if (is_bad_option(option, args->ignoreUnrecognized,
3233 "check")) {
3234 return JNI_EINVAL;
3235 }
3236 } else if (match_option(option, "vfprintf")) {
3237 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3238 } else if (match_option(option, "exit")) {
3239 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3240 } else if (match_option(option, "abort")) {
3241 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3242 // -XX:+AggressiveHeap
3243 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3244 jint result = set_aggressive_heap_flags();
3245 if (result != JNI_OK) {
3246 return result;
3247 }
3248 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3249 // and the last option wins.
3250 } else if (match_option(option, "-XX:+NeverTenure")) {
3251 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3252 return JNI_EINVAL;
3253 }
3254 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3255 return JNI_EINVAL;
3256 }
3257 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3258 return JNI_EINVAL;
3259 }
3260 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3261 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3262 return JNI_EINVAL;
3263 }
3264 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3265 return JNI_EINVAL;
3266 }
3267 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3268 return JNI_EINVAL;
3269 }
3270 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3271 uintx max_tenuring_thresh = 0;
3272 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3275 return JNI_EINVAL;
3276 }
3277
3278 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3279 return JNI_EINVAL;
3280 }
3281
3282 if (MaxTenuringThreshold == 0) {
3283 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3284 return JNI_EINVAL;
3285 }
3286 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3287 return JNI_EINVAL;
3288 }
3289 } else {
3290 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3291 return JNI_EINVAL;
3292 }
3293 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3294 return JNI_EINVAL;
3295 }
3296 }
3297 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3298 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3299 return JNI_EINVAL;
3300 }
3301 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3302 return JNI_EINVAL;
3303 }
3304 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3305 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3306 return JNI_EINVAL;
3307 }
3308 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3309 return JNI_EINVAL;
3310 }
3311 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3312 #if defined(DTRACE_ENABLED)
3313 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3314 return JNI_EINVAL;
3315 }
3316 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3317 return JNI_EINVAL;
3318 }
3319 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3320 return JNI_EINVAL;
3321 }
3322 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3323 return JNI_EINVAL;
3324 }
3325 #else // defined(DTRACE_ENABLED)
3326 jio_fprintf(defaultStream::error_stream(),
3327 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3328 return JNI_EINVAL;
3329 #endif // defined(DTRACE_ENABLED)
3330 #ifdef ASSERT
3331 } else if (match_option(option, "-XX:+FullGCALot")) {
3332 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3333 return JNI_EINVAL;
3334 }
3335 // disable scavenge before parallel mark-compact
3336 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3337 return JNI_EINVAL;
3338 }
3339 #endif
3340 #if !INCLUDE_MANAGEMENT
3341 } else if (match_option(option, "-XX:+ManagementServer")) {
3342 jio_fprintf(defaultStream::error_stream(),
3343 "ManagementServer is not supported in this VM.\n");
3344 return JNI_ERR;
3345 #endif // INCLUDE_MANAGEMENT
3346 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3347 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3348 // already been handled
3349 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3350 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3351 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3352 return JNI_EINVAL;
3353 }
3354 }
3355 // Unknown option
3356 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3357 return JNI_ERR;
3358 }
3359 }
3360
3361 // PrintSharedArchiveAndExit will turn on
3362 // -Xshare:on
3363 // -XX:+TraceClassPaths
3364 if (PrintSharedArchiveAndExit) {
3365 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3366 return JNI_EINVAL;
3367 }
3368 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3369 return JNI_EINVAL;
3370 }
3371 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3372 return JNI_EINVAL;
3373 }
3374 }
3375
3376 // Change the default value for flags which have different default values
3377 // when working with older JDKs.
3378 #ifdef LINUX
3379 if (JDK_Version::current().compare_major(6) <= 0 &&
3380 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3381 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3382 }
3383 #endif // LINUX
3384 fix_appclasspath();
3385 return JNI_OK;
3386 }
3387
3388 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3389 //
3390 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3391 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3392 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3393 // path is treated as the current directory.
3394 //
3395 // This causes problems with CDS, which requires that all directories specified in the classpath
3396 // must be empty. In most cases, applications do NOT want to load classes from the current
3397 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3398 // scripts compatible with CDS.
3399 void Arguments::fix_appclasspath() {
3400 if (IgnoreEmptyClassPaths) {
3401 const char separator = *os::path_separator();
3402 const char* src = _java_class_path->value();
3403
3404 // skip over all the leading empty paths
3405 while (*src == separator) {
3406 src ++;
3407 }
3408
3409 char* copy = os::strdup_check_oom(src, mtInternal);
3410
3411 // trim all trailing empty paths
3412 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3413 *tail = '\0';
3414 }
3415
3416 char from[3] = {separator, separator, '\0'};
3417 char to [2] = {separator, '\0'};
3418 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3419 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3420 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3421 }
3422
3423 _java_class_path->set_value(copy);
3424 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3425 }
3426
3427 if (!PrintSharedArchiveAndExit) {
3428 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3429 }
3430 }
3431
3432 static bool has_jar_files(const char* directory) {
3433 DIR* dir = os::opendir(directory);
3434 if (dir == NULL) return false;
3435
3436 struct dirent *entry;
3437 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3438 bool hasJarFile = false;
3439 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3440 const char* name = entry->d_name;
3441 const char* ext = name + strlen(name) - 4;
3442 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3443 }
3444 FREE_C_HEAP_ARRAY(char, dbuf);
3445 os::closedir(dir);
3446 return hasJarFile ;
3447 }
3448
3449 static int check_non_empty_dirs(const char* path) {
3450 const char separator = *os::path_separator();
3451 const char* const end = path + strlen(path);
3452 int nonEmptyDirs = 0;
3453 while (path < end) {
3454 const char* tmp_end = strchr(path, separator);
3455 if (tmp_end == NULL) {
3456 if (has_jar_files(path)) {
3457 nonEmptyDirs++;
3458 jio_fprintf(defaultStream::output_stream(),
3459 "Non-empty directory: %s\n", path);
3460 }
3461 path = end;
3462 } else {
3463 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3464 memcpy(dirpath, path, tmp_end - path);
3465 dirpath[tmp_end - path] = '\0';
3466 if (has_jar_files(dirpath)) {
3467 nonEmptyDirs++;
3468 jio_fprintf(defaultStream::output_stream(),
3469 "Non-empty directory: %s\n", dirpath);
3470 }
3471 FREE_C_HEAP_ARRAY(char, dirpath);
3472 path = tmp_end + 1;
3473 }
3474 }
3475 return nonEmptyDirs;
3476 }
3477
3478 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3479 // check if the default lib/endorsed directory exists; if so, error
3480 char path[JVM_MAXPATHLEN];
3481 const char* fileSep = os::file_separator();
3482 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3483
3484 #if INCLUDE_JVMCI
3485 if (EnableJVMCI) {
3486 JVMCIRuntime::save_options(_system_properties);
3487 }
3488 #endif // INCLUDE_JVMCI
3489
3490 if (CheckEndorsedAndExtDirs) {
3491 int nonEmptyDirs = 0;
3492 // check endorsed directory
3493 nonEmptyDirs += check_non_empty_dirs(path);
3494 // check the extension directories
3495 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3496 if (nonEmptyDirs > 0) {
3497 return JNI_ERR;
3498 }
3499 }
3500
3501 DIR* dir = os::opendir(path);
3502 if (dir != NULL) {
3503 jio_fprintf(defaultStream::output_stream(),
3504 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3505 "in modular form will be supported via the concept of upgradeable modules.\n");
3506 os::closedir(dir);
3507 return JNI_ERR;
3508 }
3509
3510 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3511 dir = os::opendir(path);
3512 if (dir != NULL) {
3513 jio_fprintf(defaultStream::output_stream(),
3514 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3515 "Use -classpath instead.\n.");
3516 os::closedir(dir);
3517 return JNI_ERR;
3518 }
3519
3520 if (scp_assembly_required) {
3521 // Assemble the bootclasspath elements into the final path.
3522 char *combined_path = scp_p->combined_path();
3523 Arguments::set_sysclasspath(combined_path);
3524 FREE_C_HEAP_ARRAY(char, combined_path);
3525 }
3526
3527 // This must be done after all arguments have been processed.
3528 // java_compiler() true means set to "NONE" or empty.
3529 if (java_compiler() && !xdebug_mode()) {
3530 // For backwards compatibility, we switch to interpreted mode if
3531 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3532 // not specified.
3533 set_mode_flags(_int);
3534 }
3535
3536 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3537 // but like -Xint, leave compilation thresholds unaffected.
3538 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3539 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3540 set_mode_flags(_int);
3541 }
3542
3543 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3544 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3545 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3546 }
3547
3548 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3549 // Don't degrade server performance for footprint
3550 if (FLAG_IS_DEFAULT(UseLargePages) &&
3551 MaxHeapSize < LargePageHeapSizeThreshold) {
3552 // No need for large granularity pages w/small heaps.
3553 // Note that large pages are enabled/disabled for both the
3554 // Java heap and the code cache.
3555 FLAG_SET_DEFAULT(UseLargePages, false);
3556 }
3557
3558 #elif defined(COMPILER2)
3559 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3560 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3561 }
3562 #endif
3563
3564 #ifndef TIERED
3565 // Tiered compilation is undefined.
3566 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3567 #endif
3568
3569 // If we are running in a headless jre, force java.awt.headless property
3570 // to be true unless the property has already been set.
3571 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3572 if (os::is_headless_jre()) {
3573 const char* headless = Arguments::get_property("java.awt.headless");
3574 if (headless == NULL) {
3575 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3576 if (headless_env == NULL) {
3577 if (!add_property("java.awt.headless=true")) {
3578 return JNI_ENOMEM;
3579 }
3580 } else {
3581 char buffer[256];
3582 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3583 if (!add_property(buffer)) {
3584 return JNI_ENOMEM;
3585 }
3586 }
3587 }
3588 }
3589
3590 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3591 // CMS can only be used with ParNew
3592 FLAG_SET_ERGO(bool, UseParNewGC, true);
3593 }
3594
3595 if (!check_vm_args_consistency()) {
3596 return JNI_ERR;
3597 }
3598
3599 return JNI_OK;
3600 }
3601
3602 // Helper class for controlling the lifetime of JavaVMInitArgs
3603 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3604 // deleted on the destruction of the ScopedVMInitArgs object.
3605 class ScopedVMInitArgs : public StackObj {
3606 private:
3607 JavaVMInitArgs _args;
3608 bool _is_set;
3609
3610 public:
3611 ScopedVMInitArgs() {
3612 _args.version = JNI_VERSION_1_2;
3613 _args.nOptions = 0;
3614 _args.options = NULL;
3615 _args.ignoreUnrecognized = false;
3616 _is_set = false;
3617 }
3618
3619 // Populates the JavaVMInitArgs object represented by this
3620 // ScopedVMInitArgs object with the arguments in options. The
3621 // allocated memory is deleted by the destructor. If this method
3622 // returns anything other than JNI_OK, then this object is in a
3623 // partially constructed state, and should be abandoned.
3624 jint set_args(GrowableArray<JavaVMOption>* options) {
3625 _is_set = true;
3626 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3627 JavaVMOption, options->length(), mtInternal);
3628 if (options_arr == NULL) {
3629 return JNI_ENOMEM;
3630 }
3631 _args.options = options_arr;
3632
3633 for (int i = 0; i < options->length(); i++) {
3634 options_arr[i] = options->at(i);
3635 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3636 if (options_arr[i].optionString == NULL) {
3637 // Rely on the destructor to do cleanup.
3638 _args.nOptions = i;
3639 return JNI_ENOMEM;
3640 }
3641 }
3642
3643 _args.nOptions = options->length();
3644 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3645 return JNI_OK;
3646 }
3647
3648 JavaVMInitArgs* get() { return &_args; }
3649 bool is_set() { return _is_set; }
3650
3651 ~ScopedVMInitArgs() {
3652 if (_args.options == NULL) return;
3653 for (int i = 0; i < _args.nOptions; i++) {
3654 os::free(_args.options[i].optionString);
3655 }
3656 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3657 }
3658
3659 // Insert options into this option list, to replace option at
3660 // vm_options_file_pos (-XX:VMOptionsFile)
3661 jint insert(const JavaVMInitArgs* args,
3662 const JavaVMInitArgs* args_to_insert,
3663 const int vm_options_file_pos) {
3664 assert(_args.options == NULL, "shouldn't be set yet");
3665 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3666 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3667
3668 int length = args->nOptions + args_to_insert->nOptions - 1;
3669 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3670 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3671 for (int i = 0; i < args->nOptions; i++) {
3672 if (i == vm_options_file_pos) {
3673 // insert the new options starting at the same place as the
3674 // -XX:VMOptionsFile option
3675 for (int j = 0; j < args_to_insert->nOptions; j++) {
3676 options->push(args_to_insert->options[j]);
3677 }
3678 } else {
3679 options->push(args->options[i]);
3680 }
3681 }
3682 // make into options array
3683 jint result = set_args(options);
3684 delete options;
3685 return result;
3686 }
3687 };
3688
3689 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3690 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3691 }
3692
3693 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3694 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3695 }
3696
3697 jint Arguments::parse_options_environment_variable(const char* name,
3698 ScopedVMInitArgs* vm_args) {
3699 char *buffer = ::getenv(name);
3700
3701 // Don't check this environment variable if user has special privileges
3702 // (e.g. unix su command).
3703 if (buffer == NULL || os::have_special_privileges()) {
3704 return JNI_OK;
3705 }
3706
3707 if ((buffer = os::strdup(buffer)) == NULL) {
3708 return JNI_ENOMEM;
3709 }
3710
3711 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3712
3713 os::free(buffer);
3714 return retcode;
3715 }
3716
3717 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3718 // read file into buffer
3719 int fd = ::open(file_name, O_RDONLY);
3720 if (fd < 0) {
3721 jio_fprintf(defaultStream::error_stream(),
3722 "Could not open options file '%s'\n",
3723 file_name);
3724 return JNI_ERR;
3725 }
3726
3727 struct stat stbuf;
3728 int retcode = os::stat(file_name, &stbuf);
3729 if (retcode != 0) {
3730 jio_fprintf(defaultStream::error_stream(),
3731 "Could not stat options file '%s'\n",
3732 file_name);
3733 os::close(fd);
3734 return JNI_ERR;
3735 }
3736
3737 if (stbuf.st_size == 0) {
3738 // tell caller there is no option data and that is ok
3739 os::close(fd);
3740 return JNI_OK;
3741 }
3742
3743 // '+ 1' for NULL termination even with max bytes
3744 size_t bytes_alloc = stbuf.st_size + 1;
3745
3746 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3747 if (NULL == buf) {
3748 jio_fprintf(defaultStream::error_stream(),
3749 "Could not allocate read buffer for options file parse\n");
3750 os::close(fd);
3751 return JNI_ENOMEM;
3752 }
3753
3754 memset(buf, 0, bytes_alloc);
3755
3756 // Fill buffer
3757 // Use ::read() instead of os::read because os::read()
3758 // might do a thread state transition
3759 // and it is too early for that here
3760
3761 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3762 os::close(fd);
3763 if (bytes_read < 0) {
3764 FREE_C_HEAP_ARRAY(char, buf);
3765 jio_fprintf(defaultStream::error_stream(),
3766 "Could not read options file '%s'\n", file_name);
3767 return JNI_ERR;
3768 }
3769
3770 if (bytes_read == 0) {
3771 // tell caller there is no option data and that is ok
3772 FREE_C_HEAP_ARRAY(char, buf);
3773 return JNI_OK;
3774 }
3775
3776 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3777
3778 FREE_C_HEAP_ARRAY(char, buf);
3779 return retcode;
3780 }
3781
3782 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3783 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3784
3785 // some pointers to help with parsing
3786 char *buffer_end = buffer + buf_len;
3787 char *opt_hd = buffer;
3788 char *wrt = buffer;
3789 char *rd = buffer;
3790
3791 // parse all options
3792 while (rd < buffer_end) {
3793 // skip leading white space from the input string
3794 while (rd < buffer_end && isspace(*rd)) {
3795 rd++;
3796 }
3797
3798 if (rd >= buffer_end) {
3799 break;
3800 }
3801
3802 // Remember this is where we found the head of the token.
3803 opt_hd = wrt;
3804
3805 // Tokens are strings of non white space characters separated
3806 // by one or more white spaces.
3807 while (rd < buffer_end && !isspace(*rd)) {
3808 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3809 int quote = *rd; // matching quote to look for
3810 rd++; // don't copy open quote
3811 while (rd < buffer_end && *rd != quote) {
3812 // include everything (even spaces)
3813 // up until the close quote
3814 *wrt++ = *rd++; // copy to option string
3815 }
3816
3817 if (rd < buffer_end) {
3818 rd++; // don't copy close quote
3819 } else {
3820 // did not see closing quote
3821 jio_fprintf(defaultStream::error_stream(),
3822 "Unmatched quote in %s\n", name);
3823 delete options;
3824 return JNI_ERR;
3825 }
3826 } else {
3827 *wrt++ = *rd++; // copy to option string
3828 }
3829 }
3830
3831 // steal a white space character and set it to NULL
3832 *wrt++ = '\0';
3833 // We now have a complete token
3834
3835 JavaVMOption option;
3836 option.optionString = opt_hd;
3837 option.extraInfo = NULL;
3838
3839 options->append(option); // Fill in option
3840
3841 rd++; // Advance to next character
3842 }
3843
3844 // Fill out JavaVMInitArgs structure.
3845 jint status = vm_args->set_args(options);
3846
3847 delete options;
3848 return status;
3849 }
3850
3851 void Arguments::set_shared_spaces_flags() {
3852 if (DumpSharedSpaces) {
3853 if (RequireSharedSpaces) {
3854 warning("Cannot dump shared archive while using shared archive");
3855 }
3856 UseSharedSpaces = false;
3857 #ifdef _LP64
3858 if (!UseCompressedOops || !UseCompressedClassPointers) {
3859 vm_exit_during_initialization(
3860 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3861 }
3862 } else {
3863 if (!UseCompressedOops || !UseCompressedClassPointers) {
3864 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3865 }
3866 #endif
3867 }
3868 }
3869
3870 #if !INCLUDE_ALL_GCS
3871 static void force_serial_gc() {
3872 FLAG_SET_DEFAULT(UseSerialGC, true);
3873 UNSUPPORTED_GC_OPTION(UseG1GC);
3874 UNSUPPORTED_GC_OPTION(UseParallelGC);
3875 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3876 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3877 UNSUPPORTED_GC_OPTION(UseParNewGC);
3878 }
3879 #endif // INCLUDE_ALL_GCS
3880
3881 // Sharing support
3882 // Construct the path to the archive
3883 static char* get_shared_archive_path() {
3884 char *shared_archive_path;
3885 if (SharedArchiveFile == NULL) {
3886 char jvm_path[JVM_MAXPATHLEN];
3887 os::jvm_path(jvm_path, sizeof(jvm_path));
3888 char *end = strrchr(jvm_path, *os::file_separator());
3889 if (end != NULL) *end = '\0';
3890 size_t jvm_path_len = strlen(jvm_path);
3891 size_t file_sep_len = strlen(os::file_separator());
3892 const size_t len = jvm_path_len + file_sep_len + 20;
3893 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3894 if (shared_archive_path != NULL) {
3895 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3896 jvm_path, os::file_separator());
3897 }
3898 } else {
3899 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3900 }
3901 return shared_archive_path;
3902 }
3903
3904 #ifndef PRODUCT
3905 // Determine whether LogVMOutput should be implicitly turned on.
3906 static bool use_vm_log() {
3907 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3908 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3909 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3910 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3911 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3912 return true;
3913 }
3914
3915 #ifdef COMPILER1
3916 if (PrintC1Statistics) {
3917 return true;
3918 }
3919 #endif // COMPILER1
3920
3921 #ifdef COMPILER2
3922 if (PrintOptoAssembly || PrintOptoStatistics) {
3923 return true;
3924 }
3925 #endif // COMPILER2
3926
3927 return false;
3928 }
3929
3930 #endif // PRODUCT
3931
3932 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3933 char** vm_options_file,
3934 const int vm_options_file_pos,
3935 ScopedVMInitArgs *vm_options_file_args,
3936 ScopedVMInitArgs* args_out) {
3937 jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args);
3938 if (code != JNI_OK) {
3939 return code;
3940 }
3941
3942 if (vm_options_file_args->get()->nOptions < 1) {
3943 return JNI_OK;
3944 }
3945
3946 return args_out->insert(args, vm_options_file_args->get(),
3947 vm_options_file_pos);
3948 }
3949
3950 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3951 char ** vm_options_file,
3952 ScopedVMInitArgs* args_out) {
3953 // Remaining part of option string
3954 const char* tail;
3955 int vm_options_file_pos = -1;
3956 ScopedVMInitArgs vm_options_file_args;
3957
3958 for (int index = 0; index < args->nOptions; index++) {
3959 const JavaVMOption* option = args->options + index;
3960 if (ArgumentsExt::process_options(option)) {
3961 continue;
3962 }
3963 if (match_option(option, "-XX:Flags=", &tail)) {
3964 Arguments::set_jvm_flags_file(tail);
3965 continue;
3966 }
3967 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3968 if (vm_options_file != NULL) {
3969 // The caller accepts -XX:VMOptionsFile
3970 if (*vm_options_file != NULL) {
3971 jio_fprintf(defaultStream::error_stream(),
3972 "The VM Options file can only be specified once and "
3973 "only on the command line.\n");
3974 return JNI_EINVAL;
3975 }
3976
3977 *vm_options_file = (char *) tail;
3978 vm_options_file_pos = index; // save position of -XX:VMOptionsFile
3979 // If there's a VMOptionsFile, parse that (also can set flags_file)
3980 jint code = insert_vm_options_file(args, vm_options_file,
3981 vm_options_file_pos,
3982 &vm_options_file_args, args_out);
3983 if (code != JNI_OK) {
3984 return code;
3985 }
3986 if (args_out->is_set()) {
3987 // The VMOptions file inserted some options so switch 'args'
3988 // to the new set of options, and continue processing which
3989 // preserves "last option wins" semantics.
3990 args = args_out->get();
3991 // The first option from the VMOptionsFile replaces the
3992 // current option. So we back track to process the
3993 // replacement option.
3994 index--;
3995 }
3996 } else {
3997 jio_fprintf(defaultStream::error_stream(),
3998 "VM options file is only supported on the command line\n");
3999 return JNI_EINVAL;
4000 }
4001 continue;
4002 }
4003 if (match_option(option, "-XX:+PrintVMOptions")) {
4004 PrintVMOptions = true;
4005 continue;
4006 }
4007 if (match_option(option, "-XX:-PrintVMOptions")) {
4008 PrintVMOptions = false;
4009 continue;
4010 }
4011 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4012 IgnoreUnrecognizedVMOptions = true;
4013 continue;
4014 }
4015 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4016 IgnoreUnrecognizedVMOptions = false;
4017 continue;
4018 }
4019 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4020 CommandLineFlags::printFlags(tty, false);
4021 vm_exit(0);
4022 }
4023 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4024 #if INCLUDE_NMT
4025 // The launcher did not setup nmt environment variable properly.
4026 if (!MemTracker::check_launcher_nmt_support(tail)) {
4027 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4028 }
4029
4030 // Verify if nmt option is valid.
4031 if (MemTracker::verify_nmt_option()) {
4032 // Late initialization, still in single-threaded mode.
4033 if (MemTracker::tracking_level() >= NMT_summary) {
4034 MemTracker::init();
4035 }
4036 } else {
4037 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4038 }
4039 continue;
4040 #else
4041 jio_fprintf(defaultStream::error_stream(),
4042 "Native Memory Tracking is not supported in this VM\n");
4043 return JNI_ERR;
4044 #endif
4045 }
4046
4047 #ifndef PRODUCT
4048 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4049 CommandLineFlags::printFlags(tty, true);
4050 vm_exit(0);
4051 }
4052 #endif
4053 }
4054 return JNI_OK;
4055 }
4056
4057 static void print_options(const JavaVMInitArgs *args) {
4058 const char* tail;
4059 for (int index = 0; index < args->nOptions; index++) {
4060 const JavaVMOption *option = args->options + index;
4061 if (match_option(option, "-XX:", &tail)) {
4062 logOption(tail);
4063 }
4064 }
4065 }
4066
4067 // Parse entry point called from JNI_CreateJavaVM
4068
4069 jint Arguments::parse(const JavaVMInitArgs* args) {
4070 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4071
4072 // Initialize ranges and constraints
4073 CommandLineFlagRangeList::init();
4074 CommandLineFlagConstraintList::init();
4075
4076 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4077 const char* hotspotrc = ".hotspotrc";
4078 char* vm_options_file = NULL;
4079 bool settings_file_specified = false;
4080 bool needs_hotspotrc_warning = false;
4081 ScopedVMInitArgs java_tool_options_args;
4082 ScopedVMInitArgs java_options_args;
4083 ScopedVMInitArgs modified_cmd_line_args;
4084
4085 jint code =
4086 parse_java_tool_options_environment_variable(&java_tool_options_args);
4087 if (code != JNI_OK) {
4088 return code;
4089 }
4090
4091 code = parse_java_options_environment_variable(&java_options_args);
4092 if (code != JNI_OK) {
4093 return code;
4094 }
4095
4096 code = match_special_option_and_act(java_tool_options_args.get(),
4097 NULL, NULL);
4098 if (code != JNI_OK) {
4099 return code;
4100 }
4101
4102 code = match_special_option_and_act(args, &vm_options_file,
4103 &modified_cmd_line_args);
4104 if (code != JNI_OK) {
4105 return code;
4106 }
4107
4108
4109 // The command line arguments have been modified to include VMOptionsFile arguments.
4110 if (modified_cmd_line_args.is_set()) {
4111 args = modified_cmd_line_args.get();
4112 }
4113
4114 code = match_special_option_and_act(java_options_args.get(),
4115 NULL, NULL);
4116 if (code != JNI_OK) {
4117 return code;
4118 }
4119
4120 const char * flags_file = Arguments::get_jvm_flags_file();
4121 settings_file_specified = (flags_file != NULL);
4122
4123 if (IgnoreUnrecognizedVMOptions) {
4124 // uncast const to modify the flag args->ignoreUnrecognized
4125 *(jboolean*)(&args->ignoreUnrecognized) = true;
4126 java_tool_options_args.get()->ignoreUnrecognized = true;
4127 java_options_args.get()->ignoreUnrecognized = true;
4128 }
4129
4130 // Parse specified settings file
4131 if (settings_file_specified) {
4132 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4133 return JNI_EINVAL;
4134 }
4135 } else {
4136 #ifdef ASSERT
4137 // Parse default .hotspotrc settings file
4138 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4139 return JNI_EINVAL;
4140 }
4141 #else
4142 struct stat buf;
4143 if (os::stat(hotspotrc, &buf) == 0) {
4144 needs_hotspotrc_warning = true;
4145 }
4146 #endif
4147 }
4148
4149 if (PrintVMOptions) {
4150 print_options(java_tool_options_args.get());
4151 print_options(args);
4152 print_options(java_options_args.get());
4153 }
4154
4155 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4156 jint result = parse_vm_init_args(java_tool_options_args.get(),
4157 java_options_args.get(),
4158 args); // command line arguments
4159
4160 if (result != JNI_OK) {
4161 return result;
4162 }
4163
4164 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4165 SharedArchivePath = get_shared_archive_path();
4166 if (SharedArchivePath == NULL) {
4167 return JNI_ENOMEM;
4168 }
4169
4170 // Set up VerifySharedSpaces
4171 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4172 VerifySharedSpaces = true;
4173 }
4174
4175 // Delay warning until here so that we've had a chance to process
4176 // the -XX:-PrintWarnings flag
4177 if (needs_hotspotrc_warning) {
4178 warning("%s file is present but has been ignored. "
4179 "Run with -XX:Flags=%s to load the file.",
4180 hotspotrc, hotspotrc);
4181 }
4182
4183 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4184 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4185 #endif
4186
4187 ArgumentsExt::report_unsupported_options();
4188
4189 #ifndef PRODUCT
4190 if (TraceBytecodesAt != 0) {
4191 TraceBytecodes = true;
4192 }
4193 if (CountCompiledCalls) {
4194 if (UseCounterDecay) {
4195 warning("UseCounterDecay disabled because CountCalls is set");
4196 UseCounterDecay = false;
4197 }
4198 }
4199 #endif // PRODUCT
4200
4201 if (ScavengeRootsInCode == 0) {
4202 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4203 warning("Forcing ScavengeRootsInCode non-zero");
4204 }
4205 ScavengeRootsInCode = 1;
4206 }
4207
4208 if (PrintGCDetails) {
4209 // Turn on -verbose:gc options as well
4210 PrintGC = true;
4211 }
4212
4213 // Set object alignment values.
4214 set_object_alignment();
4215
4216 #if !INCLUDE_ALL_GCS
4217 force_serial_gc();
4218 #endif // INCLUDE_ALL_GCS
4219 #if !INCLUDE_CDS
4220 if (DumpSharedSpaces || RequireSharedSpaces) {
4221 jio_fprintf(defaultStream::error_stream(),
4222 "Shared spaces are not supported in this VM\n");
4223 return JNI_ERR;
4224 }
4225 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4226 warning("Shared spaces are not supported in this VM");
4227 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4228 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4229 }
4230 no_shared_spaces("CDS Disabled");
4231 #endif // INCLUDE_CDS
4232
4233 return JNI_OK;
4234 }
4235
4236 jint Arguments::apply_ergo() {
4237
4238 // Set flags based on ergonomics.
4239 set_ergonomics_flags();
4240
4241 set_shared_spaces_flags();
4242
4243 // Check the GC selections again.
4244 if (!check_gc_consistency()) {
4245 return JNI_EINVAL;
4246 }
4247
4248 if (TieredCompilation) {
4249 set_tiered_flags();
4250 } else {
4251 int max_compilation_policy_choice = 1;
4252 #ifdef COMPILER2
4253 max_compilation_policy_choice = 2;
4254 #endif
4255 // Check if the policy is valid.
4256 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4257 vm_exit_during_initialization(
4258 "Incompatible compilation policy selected", NULL);
4259 }
4260 // Scale CompileThreshold
4261 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4262 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4263 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4264 }
4265 }
4266
4267 #ifdef COMPILER2
4268 #ifndef PRODUCT
4269 if (PrintIdealGraphLevel > 0) {
4270 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4271 }
4272 #endif
4273 #endif
4274
4275 // Set heap size based on available physical memory
4276 set_heap_size();
4277
4278 ArgumentsExt::set_gc_specific_flags();
4279
4280 // Initialize Metaspace flags and alignments
4281 Metaspace::ergo_initialize();
4282
4283 // Set bytecode rewriting flags
4284 set_bytecode_flags();
4285
4286 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4287 jint code = set_aggressive_opts_flags();
4288 if (code != JNI_OK) {
4289 return code;
4290 }
4291
4292 // Turn off biased locking for locking debug mode flags,
4293 // which are subtly different from each other but neither works with
4294 // biased locking
4295 if (UseHeavyMonitors
4296 #ifdef COMPILER1
4297 || !UseFastLocking
4298 #endif // COMPILER1
4299 #if INCLUDE_JVMCI
4300 || !JVMCIUseFastLocking
4301 #endif
4302 ) {
4303 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4304 // flag set to true on command line; warn the user that they
4305 // can't enable biased locking here
4306 warning("Biased Locking is not supported with locking debug flags"
4307 "; ignoring UseBiasedLocking flag." );
4308 }
4309 UseBiasedLocking = false;
4310 }
4311
4312 #ifdef ZERO
4313 // Clear flags not supported on zero.
4314 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4315 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4316 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4317 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4318 #endif // CC_INTERP
4319
4320 #ifdef COMPILER2
4321 if (!EliminateLocks) {
4322 EliminateNestedLocks = false;
4323 }
4324 if (!Inline) {
4325 IncrementalInline = false;
4326 }
4327 #ifndef PRODUCT
4328 if (!IncrementalInline) {
4329 AlwaysIncrementalInline = false;
4330 }
4331 #endif
4332 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4333 // nothing to use the profiling, turn if off
4334 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4335 }
4336 #endif
4337
4338 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4339 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4340 DebugNonSafepoints = true;
4341 }
4342
4343 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4344 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4345 }
4346
4347 #ifndef PRODUCT
4348 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4349 if (use_vm_log()) {
4350 LogVMOutput = true;
4351 }
4352 }
4353 #endif // PRODUCT
4354
4355 if (PrintCommandLineFlags) {
4356 CommandLineFlags::printSetFlags(tty);
4357 }
4358
4359 // Apply CPU specific policy for the BiasedLocking
4360 if (UseBiasedLocking) {
4361 if (!VM_Version::use_biased_locking() &&
4362 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4363 UseBiasedLocking = false;
4364 }
4365 }
4366 #ifdef COMPILER2
4367 if (!UseBiasedLocking || EmitSync != 0) {
4368 UseOptoBiasInlining = false;
4369 }
4370 #endif
4371
4372 return JNI_OK;
4373 }
4374
4375 jint Arguments::adjust_after_os() {
4376 if (UseNUMA) {
4377 if (UseParallelGC || UseParallelOldGC) {
4378 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4379 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4380 }
4381 }
4382 // UseNUMAInterleaving is set to ON for all collectors and
4383 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4384 // such as the parallel collector for Linux and Solaris will
4385 // interleave old gen and survivor spaces on top of NUMA
4386 // allocation policy for the eden space.
4387 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4388 // all platforms and ParallelGC on Windows will interleave all
4389 // of the heap spaces across NUMA nodes.
4390 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4391 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4392 }
4393 }
4394 return JNI_OK;
4395 }
4396
4397 int Arguments::PropertyList_count(SystemProperty* pl) {
4398 int count = 0;
4399 while(pl != NULL) {
4400 count++;
4401 pl = pl->next();
4402 }
4403 return count;
4404 }
4405
4406 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4407 assert(key != NULL, "just checking");
4408 SystemProperty* prop;
4409 for (prop = pl; prop != NULL; prop = prop->next()) {
4410 if (strcmp(key, prop->key()) == 0) return prop->value();
4411 }
4412 return NULL;
4413 }
4414
4415 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4416 int count = 0;
4417 const char* ret_val = NULL;
4418
4419 while(pl != NULL) {
4420 if(count >= index) {
4421 ret_val = pl->key();
4422 break;
4423 }
4424 count++;
4425 pl = pl->next();
4426 }
4427
4428 return ret_val;
4429 }
4430
4431 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4432 int count = 0;
4433 char* ret_val = NULL;
4434
4435 while(pl != NULL) {
4436 if(count >= index) {
4437 ret_val = pl->value();
4438 break;
4439 }
4440 count++;
4441 pl = pl->next();
4442 }
4443
4444 return ret_val;
4445 }
4446
4447 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4448 SystemProperty* p = *plist;
4449 if (p == NULL) {
4450 *plist = new_p;
4451 } else {
4452 while (p->next() != NULL) {
4453 p = p->next();
4454 }
4455 p->set_next(new_p);
4456 }
4457 }
4458
4459 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4460 if (plist == NULL)
4461 return;
4462
4463 SystemProperty* new_p = new SystemProperty(k, v, true);
4464 PropertyList_add(plist, new_p);
4465 }
4466
4467 void Arguments::PropertyList_add(SystemProperty *element) {
4468 PropertyList_add(&_system_properties, element);
4469 }
4470
4471 // This add maintains unique property key in the list.
4472 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4473 if (plist == NULL)
4474 return;
4475
4476 // If property key exist then update with new value.
4477 SystemProperty* prop;
4478 for (prop = *plist; prop != NULL; prop = prop->next()) {
4479 if (strcmp(k, prop->key()) == 0) {
4480 if (append) {
4481 prop->append_value(v);
4482 } else {
4483 prop->set_value(v);
4484 }
4485 return;
4486 }
4487 }
4488
4489 PropertyList_add(plist, k, v);
4490 }
4491
4492 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4493 // Returns true if all of the source pointed by src has been copied over to
4494 // the destination buffer pointed by buf. Otherwise, returns false.
4495 // Notes:
4496 // 1. If the length (buflen) of the destination buffer excluding the
4497 // NULL terminator character is not long enough for holding the expanded
4498 // pid characters, it also returns false instead of returning the partially
4499 // expanded one.
4500 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4501 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4502 char* buf, size_t buflen) {
4503 const char* p = src;
4504 char* b = buf;
4505 const char* src_end = &src[srclen];
4506 char* buf_end = &buf[buflen - 1];
4507
4508 while (p < src_end && b < buf_end) {
4509 if (*p == '%') {
4510 switch (*(++p)) {
4511 case '%': // "%%" ==> "%"
4512 *b++ = *p++;
4513 break;
4514 case 'p': { // "%p" ==> current process id
4515 // buf_end points to the character before the last character so
4516 // that we could write '\0' to the end of the buffer.
4517 size_t buf_sz = buf_end - b + 1;
4518 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4519
4520 // if jio_snprintf fails or the buffer is not long enough to hold
4521 // the expanded pid, returns false.
4522 if (ret < 0 || ret >= (int)buf_sz) {
4523 return false;
4524 } else {
4525 b += ret;
4526 assert(*b == '\0', "fail in copy_expand_pid");
4527 if (p == src_end && b == buf_end + 1) {
4528 // reach the end of the buffer.
4529 return true;
4530 }
4531 }
4532 p++;
4533 break;
4534 }
4535 default :
4536 *b++ = '%';
4537 }
4538 } else {
4539 *b++ = *p++;
4540 }
4541 }
4542 *b = '\0';
4543 return (p == src_end); // return false if not all of the source was copied
4544 }