1 /*
2 * Copyright (c) 1997, 2016, 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/log.hpp"
36 #include "logging/logTag.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/arguments_ext.hpp"
44 #include "runtime/commandLineFlagConstraintList.hpp"
45 #include "runtime/commandLineFlagRangeList.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.hpp"
50 #include "runtime/vm_version.hpp"
51 #include "services/management.hpp"
52 #include "services/memTracker.hpp"
53 #include "utilities/defaultStream.hpp"
54 #include "utilities/macros.hpp"
55 #include "utilities/stringUtils.hpp"
56 #if INCLUDE_JVMCI
57 #include "jvmci/jvmciRuntime.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc/cms/compactibleFreeListSpace.hpp"
61 #include "gc/g1/g1CollectedHeap.inline.hpp"
62 #include "gc/parallel/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 #define UNSUPPORTED_GC_OPTION(gc) \
70 do { \
71 if (gc) { \
72 if (FLAG_IS_CMDLINE(gc)) { \
73 warning(#gc " is not supported in this VM. Using Serial GC."); \
74 } \
75 FLAG_SET_DEFAULT(gc, false); \
76 } \
77 } while(0)
78
79 char* Arguments::_jvm_flags_file = NULL;
80 char** Arguments::_jvm_flags_array = NULL;
81 int Arguments::_num_jvm_flags = 0;
82 char** Arguments::_jvm_args_array = NULL;
83 int Arguments::_num_jvm_args = 0;
84 char* Arguments::_java_command = NULL;
85 SystemProperty* Arguments::_system_properties = NULL;
86 const char* Arguments::_gc_log_filename = NULL;
87 bool Arguments::_has_profile = false;
88 size_t Arguments::_conservative_max_heap_alignment = 0;
89 size_t Arguments::_min_heap_size = 0;
90 Arguments::Mode Arguments::_mode = _mixed;
91 bool Arguments::_java_compiler = false;
92 bool Arguments::_xdebug_mode = false;
93 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
95 int Arguments::_sun_java_launcher_pid = -1;
96 bool Arguments::_sun_java_launcher_is_altjvm = false;
97
98 // These parameters are reset in method parse_vm_init_args()
99 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
100 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
101 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
102 bool Arguments::_ClipInlining = ClipInlining;
103 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
104 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
105
106 char* Arguments::SharedArchivePath = NULL;
107
108 AgentLibraryList Arguments::_libraryList;
109 AgentLibraryList Arguments::_agentList;
110
111 abort_hook_t Arguments::_abort_hook = NULL;
112 exit_hook_t Arguments::_exit_hook = NULL;
113 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
114
115
116 SystemProperty *Arguments::_sun_boot_library_path = NULL;
117 SystemProperty *Arguments::_java_library_path = NULL;
118 SystemProperty *Arguments::_java_home = NULL;
119 SystemProperty *Arguments::_java_class_path = NULL;
120 SystemProperty *Arguments::_sun_boot_class_path = NULL;
121
122 char* Arguments::_ext_dirs = NULL;
123
124 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
125 // part of the option string.
126 static bool match_option(const JavaVMOption *option, const char* name,
127 const char** tail) {
128 size_t len = strlen(name);
129 if (strncmp(option->optionString, name, len) == 0) {
130 *tail = option->optionString + len;
131 return true;
132 } else {
133 return false;
134 }
135 }
136
137 // Check if 'option' matches 'name'. No "tail" is allowed.
138 static bool match_option(const JavaVMOption *option, const char* name) {
139 const char* tail = NULL;
140 bool result = match_option(option, name, &tail);
141 if (tail != NULL && *tail == '\0') {
142 return result;
143 } else {
144 return false;
145 }
146 }
147
148 // Return true if any of the strings in null-terminated array 'names' matches.
149 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
150 // the option must match exactly.
151 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
152 bool tail_allowed) {
153 for (/* empty */; *names != NULL; ++names) {
154 if (match_option(option, *names, tail)) {
155 if (**tail == '\0' || tail_allowed && **tail == ':') {
156 return true;
157 }
158 }
159 }
160 return false;
161 }
162
163 static void logOption(const char* opt) {
164 if (PrintVMOptions) {
165 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
166 }
167 }
168
169 // Process java launcher properties.
170 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
171 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
172 // sun.java.launcher.pid is defined.
173 // Must do this before setting up other system properties,
174 // as some of them may depend on launcher type.
175 for (int index = 0; index < args->nOptions; index++) {
176 const JavaVMOption* option = args->options + index;
177 const char* tail;
178
179 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
180 process_java_launcher_argument(tail, option->extraInfo);
181 continue;
182 }
183 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
184 if (strcmp(tail, "true") == 0) {
185 _sun_java_launcher_is_altjvm = true;
186 }
187 continue;
188 }
189 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
190 _sun_java_launcher_pid = atoi(tail);
191 continue;
192 }
193 }
194 }
195
196 // Initialize system properties key and value.
197 void Arguments::init_system_properties() {
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
199 "Java Virtual Machine Specification", false));
200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
201 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
202 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
203 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
204
205 // Following are JVMTI agent writable properties.
206 // Properties values are set to NULL and they are
207 // os specific they are initialized in os::init_system_properties_values().
208 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
209 _java_library_path = new SystemProperty("java.library.path", NULL, true);
210 _java_home = new SystemProperty("java.home", NULL, true);
211 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
212
213 _java_class_path = new SystemProperty("java.class.path", "", true);
214
215 // Add to System Property list.
216 PropertyList_add(&_system_properties, _sun_boot_library_path);
217 PropertyList_add(&_system_properties, _java_library_path);
218 PropertyList_add(&_system_properties, _java_home);
219 PropertyList_add(&_system_properties, _java_class_path);
220 PropertyList_add(&_system_properties, _sun_boot_class_path);
221
222 // Set OS specific system properties values
223 os::init_system_properties_values();
224
225 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
226 }
227
228 // Update/Initialize System properties after JDK version number is known
229 void Arguments::init_version_specific_system_properties() {
230 enum { bufsz = 16 };
231 char buffer[bufsz];
232 const char* spec_vendor = "Oracle Corporation";
233 uint32_t spec_version = JDK_Version::current().major_version();
234
235 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
236
237 PropertyList_add(&_system_properties,
238 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
239 PropertyList_add(&_system_properties,
240 new SystemProperty("java.vm.specification.version", buffer, false));
241 PropertyList_add(&_system_properties,
242 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
243 }
244
245 /*
246 * -XX argument processing:
247 *
248 * -XX arguments are defined in several places, such as:
249 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
250 * -XX arguments are parsed in parse_argument().
251 * -XX argument bounds checking is done in check_vm_args_consistency().
252 *
253 * Over time -XX arguments may change. There are mechanisms to handle common cases:
254 *
255 * ALIASED: An option that is simply another name for another option. This is often
256 * part of the process of deprecating a flag, but not all aliases need
257 * to be deprecated.
258 *
259 * Create an alias for an option by adding the old and new option names to the
260 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
261 *
262 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
263 * support may be removed in the future. Both regular and aliased options may be
264 * deprecated.
265 *
266 * Add a deprecation warning for an option (or alias) by adding an entry in the
267 * "special_jvm_flags" table and setting the "deprecated_in" field.
268 * Often an option "deprecated" in one major release will
269 * be made "obsolete" in the next. In this case the entry should also have it's
270 * "obsolete_in" field set.
271 *
272 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
273 * on the command line. A warning is printed to let the user know that option might not
274 * be accepted in the future.
275 *
276 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
277 * table and setting the "obsolete_in" field.
278 *
279 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
280 * to the current JDK version. The system will flatly refuse to admit the existence of
281 * the flag. This allows a flag to die automatically over JDK releases.
282 *
283 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
284 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
285 * - Newly obsolete or expired deprecated options should have their global variable
286 * definitions removed (from globals.hpp, etc) and related implementations removed.
287 *
288 * Recommended approach for removing options:
289 *
290 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
291 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
292 *
293 * To remove internal options (e.g. diagnostic, experimental, develop options), use
294 * a 2-step model adding major release numbers to the obsolete and expire columns.
295 *
296 * To change the name of an option, use the alias table as well as a 2-step
297 * model adding major release numbers to the deprecate and expire columns.
298 * Think twice about aliasing commonly used customer options.
299 *
300 * There are times when it is appropriate to leave a future release number as undefined.
301 *
302 * Tests: Aliases should be tested in VMAliasOptions.java.
303 * Deprecated options should be tested in VMDeprecatedOptions.java.
304 */
305
306 // Obsolete or deprecated -XX flag.
307 typedef struct {
308 const char* name;
309 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
310 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
311 JDK_Version expired_in; // When the option expires (or "undefined").
312 } SpecialFlag;
313
314 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
315 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
316 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
317 // the command-line as usual, but will issue a warning.
318 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
319 // the command-line, while issuing a warning and ignoring the flag value.
320 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
321 // existence of the flag.
322 //
323 // MANUAL CLEANUP ON JDK VERSION UPDATES:
324 // This table ensures that the handling of options will update automatically when the JDK
325 // version is incremented, but the source code needs to be cleanup up manually:
326 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
327 // variable should be removed, as well as users of the variable.
328 // - As "deprecated" options age into "obsolete" options, move the entry into the
329 // "Obsolete Flags" section of the table.
330 // - All expired options should be removed from the table.
331 static SpecialFlag const special_jvm_flags[] = {
332 // -------------- Deprecated Flags --------------
333 // --- Non-alias flags - sorted by obsolete_in then expired_in:
334 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
335 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
336 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
337 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
338
339 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
340 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
341 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
342 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
343 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
344 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
345 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
346 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
347
348 // -------------- Obsolete Flags - sorted by expired_in --------------
349 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 #ifndef ZERO
363 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 #endif // ZERO
366 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
373 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
374 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
375 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
376
377 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
378 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
379 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
380 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
381 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
382 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
383 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
384 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
385 #endif
386
387 { NULL, JDK_Version(0), JDK_Version(0) }
388 };
389
390 // Flags that are aliases for other flags.
391 typedef struct {
392 const char* alias_name;
393 const char* real_name;
394 } AliasedFlag;
395
396 static AliasedFlag const aliased_jvm_flags[] = {
397 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
398 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
399 { "CMSMarkStackSize", "MarkStackSize" },
400 { "G1MarkStackSize", "MarkStackSize" },
401 { "ParallelMarkingThreads", "ConcGCThreads" },
402 { "ParallelCMSThreads", "ConcGCThreads" },
403 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
404 { NULL, NULL}
405 };
406
407 static AliasedLoggingFlag const aliased_logging_flags[] = {
408 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
409 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(classload) },
410 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(classload, preorder) },
411 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(classpath) },
412 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(classresolve) },
413 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(classunload) },
414 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
415 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
416 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepointcleanup) },
417 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
418 };
419
420 // Return true if "v" is less than "other", where "other" may be "undefined".
421 static bool version_less_than(JDK_Version v, JDK_Version other) {
422 assert(!v.is_undefined(), "must be defined");
423 if (!other.is_undefined() && v.compare(other) >= 0) {
424 return false;
425 } else {
426 return true;
427 }
428 }
429
430 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
431 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
432 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
433 flag = special_jvm_flags[i];
434 return true;
435 }
436 }
437 return false;
438 }
439
440 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
441 assert(version != NULL, "Must provide a version buffer");
442 SpecialFlag flag;
443 if (lookup_special_flag(flag_name, flag)) {
444 if (!flag.obsolete_in.is_undefined()) {
445 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
446 *version = flag.obsolete_in;
447 return true;
448 }
449 }
450 }
451 return false;
452 }
453
454 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
455 assert(version != NULL, "Must provide a version buffer");
456 SpecialFlag flag;
457 if (lookup_special_flag(flag_name, flag)) {
458 if (!flag.deprecated_in.is_undefined()) {
459 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
460 version_less_than(JDK_Version::current(), flag.expired_in)) {
461 *version = flag.deprecated_in;
462 return 1;
463 } else {
464 return -1;
465 }
466 }
467 }
468 return 0;
469 }
470
471 const char* Arguments::real_flag_name(const char *flag_name) {
472 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
473 const AliasedFlag& flag_status = aliased_jvm_flags[i];
474 if (strcmp(flag_status.alias_name, flag_name) == 0) {
475 return flag_status.real_name;
476 }
477 }
478 return flag_name;
479 }
480
481 #ifdef ASSERT
482 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
483 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
484 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
485 return true;
486 }
487 }
488 return false;
489 }
490
491 static bool verify_special_jvm_flags() {
492 bool success = true;
493 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
494 const SpecialFlag& flag = special_jvm_flags[i];
495 if (lookup_special_flag(flag.name, i)) {
496 warning("Duplicate special flag declaration \"%s\"", flag.name);
497 success = false;
498 }
499 if (flag.deprecated_in.is_undefined() &&
500 flag.obsolete_in.is_undefined()) {
501 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
502 success = false;
503 }
504
505 if (!flag.deprecated_in.is_undefined()) {
506 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
507 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
508 success = false;
509 }
510
511 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
512 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
513 success = false;
514 }
515 }
516
517 if (!flag.obsolete_in.is_undefined()) {
518 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
519 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
520 success = false;
521 }
522
523 // if flag has become obsolete it should not have a "globals" flag defined anymore.
524 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
525 if (Flag::find_flag(flag.name) != NULL) {
526 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
527 success = false;
528 }
529 }
530 }
531
532 if (!flag.expired_in.is_undefined()) {
533 // if flag has become expired it should not have a "globals" flag defined anymore.
534 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
535 if (Flag::find_flag(flag.name) != NULL) {
536 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
537 success = false;
538 }
539 }
540 }
541
542 }
543 return success;
544 }
545 #endif
546
547 // Constructs the system class path (aka boot class path) from the following
548 // components, in order:
549 //
550 // prefix // from -Xbootclasspath/p:...
551 // base // from os::get_system_properties() or -Xbootclasspath=
552 // suffix // from -Xbootclasspath/a:...
553 //
554 // This could be AllStatic, but it isn't needed after argument processing is
555 // complete.
556 class SysClassPath: public StackObj {
557 public:
558 SysClassPath(const char* base);
559 ~SysClassPath();
560
561 inline void set_base(const char* base);
562 inline void add_prefix(const char* prefix);
563 inline void add_suffix_to_prefix(const char* suffix);
564 inline void add_suffix(const char* suffix);
565 inline void reset_path(const char* base);
566
567 inline const char* get_base() const { return _items[_scp_base]; }
568 inline const char* get_prefix() const { return _items[_scp_prefix]; }
569 inline const char* get_suffix() const { return _items[_scp_suffix]; }
570
571 // Combine all the components into a single c-heap-allocated string; caller
572 // must free the string if/when no longer needed.
573 char* combined_path();
574
575 private:
576 // Utility routines.
577 static char* add_to_path(const char* path, const char* str, bool prepend);
578 static char* add_jars_to_path(char* path, const char* directory);
579
580 inline void reset_item_at(int index);
581
582 // Array indices for the items that make up the sysclasspath. All except the
583 // base are allocated in the C heap and freed by this class.
584 enum {
585 _scp_prefix, // from -Xbootclasspath/p:...
586 _scp_base, // the default sysclasspath
587 _scp_suffix, // from -Xbootclasspath/a:...
588 _scp_nitems // the number of items, must be last.
589 };
590
591 const char* _items[_scp_nitems];
592 };
593
594 SysClassPath::SysClassPath(const char* base) {
595 memset(_items, 0, sizeof(_items));
596 _items[_scp_base] = base;
597 }
598
599 SysClassPath::~SysClassPath() {
600 // Free everything except the base.
601 for (int i = 0; i < _scp_nitems; ++i) {
602 if (i != _scp_base) reset_item_at(i);
603 }
604 }
605
606 inline void SysClassPath::set_base(const char* base) {
607 _items[_scp_base] = base;
608 }
609
610 inline void SysClassPath::add_prefix(const char* prefix) {
611 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
612 }
613
614 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
615 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
616 }
617
618 inline void SysClassPath::add_suffix(const char* suffix) {
619 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
620 }
621
622 inline void SysClassPath::reset_item_at(int index) {
623 assert(index < _scp_nitems && index != _scp_base, "just checking");
624 if (_items[index] != NULL) {
625 FREE_C_HEAP_ARRAY(char, _items[index]);
626 _items[index] = NULL;
627 }
628 }
629
630 inline void SysClassPath::reset_path(const char* base) {
631 // Clear the prefix and suffix.
632 reset_item_at(_scp_prefix);
633 reset_item_at(_scp_suffix);
634 set_base(base);
635 }
636
637 //------------------------------------------------------------------------------
638
639
640 // Combine the bootclasspath elements, some of which may be null, into a single
641 // c-heap-allocated string.
642 char* SysClassPath::combined_path() {
643 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
644
645 size_t lengths[_scp_nitems];
646 size_t total_len = 0;
647
648 const char separator = *os::path_separator();
649
650 // Get the lengths.
651 int i;
652 for (i = 0; i < _scp_nitems; ++i) {
653 if (_items[i] != NULL) {
654 lengths[i] = strlen(_items[i]);
655 // Include space for the separator char (or a NULL for the last item).
656 total_len += lengths[i] + 1;
657 }
658 }
659 assert(total_len > 0, "empty sysclasspath not allowed");
660
661 // Copy the _items to a single string.
662 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
663 char* cp_tmp = cp;
664 for (i = 0; i < _scp_nitems; ++i) {
665 if (_items[i] != NULL) {
666 memcpy(cp_tmp, _items[i], lengths[i]);
667 cp_tmp += lengths[i];
668 *cp_tmp++ = separator;
669 }
670 }
671 *--cp_tmp = '\0'; // Replace the extra separator.
672 return cp;
673 }
674
675 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
676 char*
677 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
678 char *cp;
679
680 assert(str != NULL, "just checking");
681 if (path == NULL) {
682 size_t len = strlen(str) + 1;
683 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
684 memcpy(cp, str, len); // copy the trailing null
685 } else {
686 const char separator = *os::path_separator();
687 size_t old_len = strlen(path);
688 size_t str_len = strlen(str);
689 size_t len = old_len + str_len + 2;
690
691 if (prepend) {
692 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
693 char* cp_tmp = cp;
694 memcpy(cp_tmp, str, str_len);
695 cp_tmp += str_len;
696 *cp_tmp = separator;
697 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
698 FREE_C_HEAP_ARRAY(char, path);
699 } else {
700 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
701 char* cp_tmp = cp + old_len;
702 *cp_tmp = separator;
703 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
704 }
705 }
706 return cp;
707 }
708
709 // Scan the directory and append any jar or zip files found to path.
710 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
711 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
712 DIR* dir = os::opendir(directory);
713 if (dir == NULL) return path;
714
715 char dir_sep[2] = { '\0', '\0' };
716 size_t directory_len = strlen(directory);
717 const char fileSep = *os::file_separator();
718 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
719
720 /* Scan the directory for jars/zips, appending them to path. */
721 struct dirent *entry;
722 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
723 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
724 const char* name = entry->d_name;
725 const char* ext = name + strlen(name) - 4;
726 bool isJarOrZip = ext > name &&
727 (os::file_name_strcmp(ext, ".jar") == 0 ||
728 os::file_name_strcmp(ext, ".zip") == 0);
729 if (isJarOrZip) {
730 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
731 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
732 path = add_to_path(path, jarpath, false);
733 FREE_C_HEAP_ARRAY(char, jarpath);
734 }
735 }
736 FREE_C_HEAP_ARRAY(char, dbuf);
737 os::closedir(dir);
738 return path;
739 }
740
741 // Parses a memory size specification string.
742 static bool atomull(const char *s, julong* result) {
743 julong n = 0;
744 int args_read = 0;
745 bool is_hex = false;
746 // Skip leading 0[xX] for hexadecimal
747 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
748 s += 2;
749 is_hex = true;
750 args_read = sscanf(s, JULONG_FORMAT_X, &n);
751 } else {
752 args_read = sscanf(s, JULONG_FORMAT, &n);
753 }
754 if (args_read != 1) {
755 return false;
756 }
757 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
758 s++;
759 }
760 // 4705540: illegal if more characters are found after the first non-digit
761 if (strlen(s) > 1) {
762 return false;
763 }
764 switch (*s) {
765 case 'T': case 't':
766 *result = n * G * K;
767 // Check for overflow.
768 if (*result/((julong)G * K) != n) return false;
769 return true;
770 case 'G': case 'g':
771 *result = n * G;
772 if (*result/G != n) return false;
773 return true;
774 case 'M': case 'm':
775 *result = n * M;
776 if (*result/M != n) return false;
777 return true;
778 case 'K': case 'k':
779 *result = n * K;
780 if (*result/K != n) return false;
781 return true;
782 case '\0':
783 *result = n;
784 return true;
785 default:
786 return false;
787 }
788 }
789
790 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
791 if (size < min_size) return arg_too_small;
792 // Check that size will fit in a size_t (only relevant on 32-bit)
793 if (size > max_uintx) return arg_too_big;
794 return arg_in_range;
795 }
796
797 // Describe an argument out of range error
798 void Arguments::describe_range_error(ArgsRange errcode) {
799 switch(errcode) {
800 case arg_too_big:
801 jio_fprintf(defaultStream::error_stream(),
802 "The specified size exceeds the maximum "
803 "representable size.\n");
804 break;
805 case arg_too_small:
806 case arg_unreadable:
807 case arg_in_range:
808 // do nothing for now
809 break;
810 default:
811 ShouldNotReachHere();
812 }
813 }
814
815 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
816 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
817 return true;
818 } else {
819 return false;
820 }
821 }
822
823 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
824 char* end;
825 errno = 0;
826 double v = strtod(value, &end);
827 if ((errno != 0) || (*end != 0)) {
828 return false;
829 }
830
831 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
832 return true;
833 }
834 return false;
835 }
836
837 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
838 julong v;
839 int int_v;
840 intx intx_v;
841 bool is_neg = false;
842 Flag* result = Flag::find_flag(name, strlen(name));
843
844 if (result == NULL) {
845 return false;
846 }
847
848 // Check the sign first since atomull() parses only unsigned values.
849 if (*value == '-') {
850 if (!result->is_intx() && !result->is_int()) {
851 return false;
852 }
853 value++;
854 is_neg = true;
855 }
856 if (!atomull(value, &v)) {
857 return false;
858 }
859 if (result->is_int()) {
860 int_v = (int) v;
861 if (is_neg) {
862 int_v = -int_v;
863 }
864 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
865 } else if (result->is_uint()) {
866 uint uint_v = (uint) v;
867 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
868 } else if (result->is_intx()) {
869 intx_v = (intx) v;
870 if (is_neg) {
871 intx_v = -intx_v;
872 }
873 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
874 } else if (result->is_uintx()) {
875 uintx uintx_v = (uintx) v;
876 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
877 } else if (result->is_uint64_t()) {
878 uint64_t uint64_t_v = (uint64_t) v;
879 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
880 } else if (result->is_size_t()) {
881 size_t size_t_v = (size_t) v;
882 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
883 } else {
884 return false;
885 }
886 }
887
888 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
889 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
890 // Contract: CommandLineFlags always returns a pointer that needs freeing.
891 FREE_C_HEAP_ARRAY(char, value);
892 return true;
893 }
894
895 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
896 const char* old_value = "";
897 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
898 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
899 size_t new_len = strlen(new_value);
900 const char* value;
901 char* free_this_too = NULL;
902 if (old_len == 0) {
903 value = new_value;
904 } else if (new_len == 0) {
905 value = old_value;
906 } else {
907 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
908 // each new setting adds another LINE to the switch:
909 sprintf(buf, "%s\n%s", old_value, new_value);
910 value = buf;
911 free_this_too = buf;
912 }
913 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
914 // CommandLineFlags always returns a pointer that needs freeing.
915 FREE_C_HEAP_ARRAY(char, value);
916 if (free_this_too != NULL) {
917 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
918 FREE_C_HEAP_ARRAY(char, free_this_too);
919 }
920 return true;
921 }
922
923 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
924 const char* real_name = real_flag_name(arg);
925 JDK_Version since = JDK_Version();
926 switch (is_deprecated_flag(arg, &since)) {
927 case -1:
928 return NULL; // obsolete or expired, don't process normally
929 case 0:
930 return real_name;
931 case 1: {
932 if (warn) {
933 char version[256];
934 since.to_string(version, sizeof(version));
935 if (real_name != arg) {
936 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
937 arg, version, real_name);
938 } else {
939 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
940 arg, version);
941 }
942 }
943 return real_name;
944 }
945 }
946 ShouldNotReachHere();
947 return NULL;
948 }
949
950 void log_deprecated_flag( const char* name, const char* pref, AliasedLoggingFlag alf) {
951 LogTagType tagSet[5] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4};
952 int max_tagset_size = 256;
953 char tagset_buffer[max_tagset_size];
954 memset(tagset_buffer, 0, max_tagset_size);
955 char* pos = tagset_buffer;
956
957 // Write tag-set for aliased logging option, in string list form
958 for (int i = 0; i < 5 && tagSet[i] != LogTag::__NO_TAG; i++) {
959 if (i > 0) {
960 strcpy(pos, ",");
961 pos++;
962 }
963 strcpy(pos, LogTag::name(tagSet[i]));
964 pos += strlen(pos);
965 }
966
967 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
968 pref,
969 name,
970 tagset_buffer,
971 (pref == "-") ? "off" : LogLevel::name(alf.level));
972 }
973
974 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, const char* pref){
975 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
976 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
977 if (strcmp(alf.alias_name, name) == 0) {
978 log_deprecated_flag(name, pref, alf);
979 return alf;
980 }
981 }
982 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
983 return a;
984 }
985
986 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
987
988 // range of acceptable characters spelled out for portability reasons
989 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
990 #define BUFLEN 255
991 char name[BUFLEN+1];
992 char dummy;
993 const char* real_name;
994 bool warn_if_deprecated = true;
995
996 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
997 AliasedLoggingFlag alf = catch_logging_aliases(name, "-");
998 if (alf.alias_name != NULL){
999 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1000 return true;
1001 }
1002 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1003 if (real_name == NULL) {
1004 return false;
1005 }
1006 return set_bool_flag(real_name, false, origin);
1007 }
1008 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1009 AliasedLoggingFlag alf = catch_logging_aliases(name, "+");
1010 if (alf.alias_name != NULL){
1011 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1012 return true;
1013 }
1014 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1015 if (real_name == NULL) {
1016 return false;
1017 }
1018 return set_bool_flag(real_name, true, origin);
1019 }
1020
1021 char punct;
1022 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1023 const char* value = strchr(arg, '=') + 1;
1024 Flag* flag;
1025
1026 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1027 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1028 if (real_name == NULL) {
1029 return false;
1030 }
1031 flag = Flag::find_flag(real_name);
1032 if (flag != NULL && flag->is_ccstr()) {
1033 if (flag->ccstr_accumulates()) {
1034 return append_to_string_flag(real_name, value, origin);
1035 } else {
1036 if (value[0] == '\0') {
1037 value = NULL;
1038 }
1039 return set_string_flag(real_name, value, origin);
1040 }
1041 } else {
1042 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1043 }
1044 }
1045
1046 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1047 const char* value = strchr(arg, '=') + 1;
1048 // -XX:Foo:=xxx will reset the string flag to the given value.
1049 if (value[0] == '\0') {
1050 value = NULL;
1051 }
1052 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1053 if (real_name == NULL) {
1054 return false;
1055 }
1056 return set_string_flag(real_name, value, origin);
1057 }
1058
1059 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1060 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1061 #define NUMBER_RANGE "[0123456789eE+-]"
1062 char value[BUFLEN + 1];
1063 char value2[BUFLEN + 1];
1064 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1065 // Looks like a floating-point number -- try again with more lenient format string
1066 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1067 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1068 if (real_name == NULL) {
1069 return false;
1070 }
1071 return set_fp_numeric_flag(real_name, value, origin);
1072 }
1073 }
1074
1075 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1076 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1077 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1078 if (real_name == NULL) {
1079 return false;
1080 }
1081 return set_numeric_flag(real_name, value, origin);
1082 }
1083
1084 return false;
1085 }
1086
1087 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1088 assert(bldarray != NULL, "illegal argument");
1089
1090 if (arg == NULL) {
1091 return;
1092 }
1093
1094 int new_count = *count + 1;
1095
1096 // expand the array and add arg to the last element
1097 if (*bldarray == NULL) {
1098 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1099 } else {
1100 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1101 }
1102 (*bldarray)[*count] = os::strdup_check_oom(arg);
1103 *count = new_count;
1104 }
1105
1106 void Arguments::build_jvm_args(const char* arg) {
1107 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1108 }
1109
1110 void Arguments::build_jvm_flags(const char* arg) {
1111 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1112 }
1113
1114 // utility function to return a string that concatenates all
1115 // strings in a given char** array
1116 const char* Arguments::build_resource_string(char** args, int count) {
1117 if (args == NULL || count == 0) {
1118 return NULL;
1119 }
1120 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1121 for (int i = 1; i < count; i++) {
1122 length += strlen(args[i]) + 1; // add 1 for a space
1123 }
1124 char* s = NEW_RESOURCE_ARRAY(char, length);
1125 strcpy(s, args[0]);
1126 for (int j = 1; j < count; j++) {
1127 strcat(s, " ");
1128 strcat(s, args[j]);
1129 }
1130 return (const char*) s;
1131 }
1132
1133 void Arguments::print_on(outputStream* st) {
1134 st->print_cr("VM Arguments:");
1135 if (num_jvm_flags() > 0) {
1136 st->print("jvm_flags: "); print_jvm_flags_on(st);
1137 st->cr();
1138 }
1139 if (num_jvm_args() > 0) {
1140 st->print("jvm_args: "); print_jvm_args_on(st);
1141 st->cr();
1142 }
1143 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1144 if (_java_class_path != NULL) {
1145 char* path = _java_class_path->value();
1146 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1147 }
1148 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1149 }
1150
1151 void Arguments::print_summary_on(outputStream* st) {
1152 // Print the command line. Environment variables that are helpful for
1153 // reproducing the problem are written later in the hs_err file.
1154 // flags are from setting file
1155 if (num_jvm_flags() > 0) {
1156 st->print_raw("Settings File: ");
1157 print_jvm_flags_on(st);
1158 st->cr();
1159 }
1160 // args are the command line and environment variable arguments.
1161 st->print_raw("Command Line: ");
1162 if (num_jvm_args() > 0) {
1163 print_jvm_args_on(st);
1164 }
1165 // this is the classfile and any arguments to the java program
1166 if (java_command() != NULL) {
1167 st->print("%s", java_command());
1168 }
1169 st->cr();
1170 }
1171
1172 void Arguments::print_jvm_flags_on(outputStream* st) {
1173 if (_num_jvm_flags > 0) {
1174 for (int i=0; i < _num_jvm_flags; i++) {
1175 st->print("%s ", _jvm_flags_array[i]);
1176 }
1177 }
1178 }
1179
1180 void Arguments::print_jvm_args_on(outputStream* st) {
1181 if (_num_jvm_args > 0) {
1182 for (int i=0; i < _num_jvm_args; i++) {
1183 st->print("%s ", _jvm_args_array[i]);
1184 }
1185 }
1186 }
1187
1188 bool Arguments::process_argument(const char* arg,
1189 jboolean ignore_unrecognized,
1190 Flag::Flags origin) {
1191 JDK_Version since = JDK_Version();
1192
1193 if (parse_argument(arg, origin)) {
1194 return true;
1195 }
1196
1197 // Determine if the flag has '+', '-', or '=' characters.
1198 bool has_plus_minus = (*arg == '+' || *arg == '-');
1199 const char* const argname = has_plus_minus ? arg + 1 : arg;
1200
1201 size_t arg_len;
1202 const char* equal_sign = strchr(argname, '=');
1203 if (equal_sign == NULL) {
1204 arg_len = strlen(argname);
1205 } else {
1206 arg_len = equal_sign - argname;
1207 }
1208
1209 // Only make the obsolete check for valid arguments.
1210 if (arg_len <= BUFLEN) {
1211 // Construct a string which consists only of the argument name without '+', '-', or '='.
1212 char stripped_argname[BUFLEN+1];
1213 strncpy(stripped_argname, argname, arg_len);
1214 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1215
1216 if (is_obsolete_flag(stripped_argname, &since)) {
1217 char version[256];
1218 since.to_string(version, sizeof(version));
1219 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1220 return true;
1221 }
1222 }
1223
1224 // For locked flags, report a custom error message if available.
1225 // Otherwise, report the standard unrecognized VM option.
1226 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1227 if (found_flag != NULL) {
1228 char locked_message_buf[BUFLEN];
1229 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1230 if (strlen(locked_message_buf) == 0) {
1231 if (found_flag->is_bool() && !has_plus_minus) {
1232 jio_fprintf(defaultStream::error_stream(),
1233 "Missing +/- setting for VM option '%s'\n", argname);
1234 } else if (!found_flag->is_bool() && has_plus_minus) {
1235 jio_fprintf(defaultStream::error_stream(),
1236 "Unexpected +/- setting in VM option '%s'\n", argname);
1237 } else {
1238 jio_fprintf(defaultStream::error_stream(),
1239 "Improperly specified VM option '%s'\n", argname);
1240 }
1241 } else {
1242 #ifdef PRODUCT
1243 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1244 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1245 if (ignore_unrecognized && mismatched) {
1246 return true;
1247 }
1248 #endif
1249 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1250 }
1251 } else {
1252 if (ignore_unrecognized) {
1253 return true;
1254 }
1255 jio_fprintf(defaultStream::error_stream(),
1256 "Unrecognized VM option '%s'\n", argname);
1257 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1258 if (fuzzy_matched != NULL) {
1259 jio_fprintf(defaultStream::error_stream(),
1260 "Did you mean '%s%s%s'? ",
1261 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1262 fuzzy_matched->_name,
1263 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1264 }
1265 }
1266
1267 // allow for commandline "commenting out" options like -XX:#+Verbose
1268 return arg[0] == '#';
1269 }
1270
1271 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1272 FILE* stream = fopen(file_name, "rb");
1273 if (stream == NULL) {
1274 if (should_exist) {
1275 jio_fprintf(defaultStream::error_stream(),
1276 "Could not open settings file %s\n", file_name);
1277 return false;
1278 } else {
1279 return true;
1280 }
1281 }
1282
1283 char token[1024];
1284 int pos = 0;
1285
1286 bool in_white_space = true;
1287 bool in_comment = false;
1288 bool in_quote = false;
1289 char quote_c = 0;
1290 bool result = true;
1291
1292 int c = getc(stream);
1293 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1294 if (in_white_space) {
1295 if (in_comment) {
1296 if (c == '\n') in_comment = false;
1297 } else {
1298 if (c == '#') in_comment = true;
1299 else if (!isspace(c)) {
1300 in_white_space = false;
1301 token[pos++] = c;
1302 }
1303 }
1304 } else {
1305 if (c == '\n' || (!in_quote && isspace(c))) {
1306 // token ends at newline, or at unquoted whitespace
1307 // this allows a way to include spaces in string-valued options
1308 token[pos] = '\0';
1309 logOption(token);
1310 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1311 build_jvm_flags(token);
1312 pos = 0;
1313 in_white_space = true;
1314 in_quote = false;
1315 } else if (!in_quote && (c == '\'' || c == '"')) {
1316 in_quote = true;
1317 quote_c = c;
1318 } else if (in_quote && (c == quote_c)) {
1319 in_quote = false;
1320 } else {
1321 token[pos++] = c;
1322 }
1323 }
1324 c = getc(stream);
1325 }
1326 if (pos > 0) {
1327 token[pos] = '\0';
1328 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1329 build_jvm_flags(token);
1330 }
1331 fclose(stream);
1332 return result;
1333 }
1334
1335 //=============================================================================================================
1336 // Parsing of properties (-D)
1337
1338 const char* Arguments::get_property(const char* key) {
1339 return PropertyList_get_value(system_properties(), key);
1340 }
1341
1342 bool Arguments::add_property(const char* prop) {
1343 const char* eq = strchr(prop, '=');
1344 const char* key;
1345 const char* value = "";
1346
1347 if (eq == NULL) {
1348 // property doesn't have a value, thus use passed string
1349 key = prop;
1350 } else {
1351 // property have a value, thus extract it and save to the
1352 // allocated string
1353 size_t key_len = eq - prop;
1354 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1355
1356 strncpy(tmp_key, prop, key_len);
1357 tmp_key[key_len] = '\0';
1358 key = tmp_key;
1359
1360 value = &prop[key_len + 1];
1361 }
1362
1363 if (strcmp(key, "java.compiler") == 0) {
1364 process_java_compiler_argument(value);
1365 // Record value in Arguments, but let it get passed to Java.
1366 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1367 strcmp(key, "sun.java.launcher.pid") == 0) {
1368 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1369 // private and are processed in process_sun_java_launcher_properties();
1370 // the sun.java.launcher property is passed on to the java application
1371 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1372 PropertyList_unique_add(&_system_properties, key, value, true);
1373 } else {
1374 if (strcmp(key, "sun.java.command") == 0) {
1375 char *old_java_command = _java_command;
1376 _java_command = os::strdup_check_oom(value, mtInternal);
1377 if (old_java_command != NULL) {
1378 os::free(old_java_command);
1379 }
1380 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1381 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1382 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1383 // its value without going through the property list or making a Java call.
1384 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1385 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1386 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1387 os::free((void *)old_java_vendor_url_bug);
1388 }
1389 }
1390
1391 // Create new property and add at the end of the list
1392 PropertyList_unique_add(&_system_properties, key, value);
1393 }
1394
1395 if (key != prop) {
1396 // SystemProperty copy passed value, thus free previously allocated
1397 // memory
1398 FreeHeap((void *)key);
1399 }
1400
1401 return true;
1402 }
1403
1404 //===========================================================================================================
1405 // Setting int/mixed/comp mode flags
1406
1407 void Arguments::set_mode_flags(Mode mode) {
1408 // Set up default values for all flags.
1409 // If you add a flag to any of the branches below,
1410 // add a default value for it here.
1411 set_java_compiler(false);
1412 _mode = mode;
1413
1414 // Ensure Agent_OnLoad has the correct initial values.
1415 // This may not be the final mode; mode may change later in onload phase.
1416 PropertyList_unique_add(&_system_properties, "java.vm.info",
1417 VM_Version::vm_info_string(), false);
1418
1419 UseInterpreter = true;
1420 UseCompiler = true;
1421 UseLoopCounter = true;
1422
1423 // Default values may be platform/compiler dependent -
1424 // use the saved values
1425 ClipInlining = Arguments::_ClipInlining;
1426 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1427 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1428 BackgroundCompilation = Arguments::_BackgroundCompilation;
1429 if (TieredCompilation) {
1430 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1431 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1432 }
1433 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1434 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1435 }
1436 }
1437
1438 // Change from defaults based on mode
1439 switch (mode) {
1440 default:
1441 ShouldNotReachHere();
1442 break;
1443 case _int:
1444 UseCompiler = false;
1445 UseLoopCounter = false;
1446 AlwaysCompileLoopMethods = false;
1447 UseOnStackReplacement = false;
1448 break;
1449 case _mixed:
1450 // same as default
1451 break;
1452 case _comp:
1453 UseInterpreter = false;
1454 BackgroundCompilation = false;
1455 ClipInlining = false;
1456 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1457 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1458 // compile a level 4 (C2) and then continue executing it.
1459 if (TieredCompilation) {
1460 Tier3InvokeNotifyFreqLog = 0;
1461 Tier4InvocationThreshold = 0;
1462 }
1463 break;
1464 }
1465 }
1466
1467 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1468 // Conflict: required to use shared spaces (-Xshare:on), but
1469 // incompatible command line options were chosen.
1470
1471 static void no_shared_spaces(const char* message) {
1472 if (RequireSharedSpaces) {
1473 jio_fprintf(defaultStream::error_stream(),
1474 "Class data sharing is inconsistent with other specified options.\n");
1475 vm_exit_during_initialization("Unable to use shared archive.", message);
1476 } else {
1477 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1478 }
1479 }
1480 #endif
1481
1482 // Returns threshold scaled with the value of scale.
1483 // If scale < 0.0, threshold is returned without scaling.
1484 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1485 if (scale == 1.0 || scale < 0.0) {
1486 return threshold;
1487 } else {
1488 return (intx)(threshold * scale);
1489 }
1490 }
1491
1492 // Returns freq_log scaled with the value of scale.
1493 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1494 // If scale < 0.0, freq_log is returned without scaling.
1495 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1496 // Check if scaling is necessary or if negative value was specified.
1497 if (scale == 1.0 || scale < 0.0) {
1498 return freq_log;
1499 }
1500 // Check values to avoid calculating log2 of 0.
1501 if (scale == 0.0 || freq_log == 0) {
1502 return 0;
1503 }
1504 // Determine the maximum notification frequency value currently supported.
1505 // The largest mask value that the interpreter/C1 can handle is
1506 // of length InvocationCounter::number_of_count_bits. Mask values are always
1507 // one bit shorter then the value of the notification frequency. Set
1508 // max_freq_bits accordingly.
1509 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1510 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1511 if (scaled_freq == 0) {
1512 // Return 0 right away to avoid calculating log2 of 0.
1513 return 0;
1514 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1515 return max_freq_bits;
1516 } else {
1517 return log2_intptr(scaled_freq);
1518 }
1519 }
1520
1521 void Arguments::set_tiered_flags() {
1522 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1523 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1524 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1525 }
1526 if (CompilationPolicyChoice < 2) {
1527 vm_exit_during_initialization(
1528 "Incompatible compilation policy selected", NULL);
1529 }
1530 // Increase the code cache size - tiered compiles a lot more.
1531 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1532 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1533 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1534 }
1535 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1536 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1537 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1538 }
1539 if (!UseInterpreter) { // -Xcomp
1540 Tier3InvokeNotifyFreqLog = 0;
1541 Tier4InvocationThreshold = 0;
1542 }
1543
1544 if (CompileThresholdScaling < 0) {
1545 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1546 }
1547
1548 // Scale tiered compilation thresholds.
1549 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1550 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1551 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1552 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1553
1554 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1555 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1556 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1557 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1558
1559 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1560 // once these thresholds become supported.
1561
1562 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1563 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1564
1565 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1566 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1567
1568 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1569
1570 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1571 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1572 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1573 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1574 }
1575 }
1576
1577 #if INCLUDE_ALL_GCS
1578 static void disable_adaptive_size_policy(const char* collector_name) {
1579 if (UseAdaptiveSizePolicy) {
1580 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1581 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1582 collector_name);
1583 }
1584 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1585 }
1586 }
1587
1588 void Arguments::set_parnew_gc_flags() {
1589 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1590 "control point invariant");
1591 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1592 assert(UseParNewGC, "ParNew should always be used with CMS");
1593
1594 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1595 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1596 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1597 } else if (ParallelGCThreads == 0) {
1598 jio_fprintf(defaultStream::error_stream(),
1599 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1600 vm_exit(1);
1601 }
1602
1603 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1604 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1605 // we set them to 1024 and 1024.
1606 // See CR 6362902.
1607 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1608 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1609 }
1610 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1611 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1612 }
1613
1614 // When using compressed oops, we use local overflow stacks,
1615 // rather than using a global overflow list chained through
1616 // the klass word of the object's pre-image.
1617 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1618 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1619 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1620 }
1621 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1622 }
1623 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1624 }
1625
1626 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1627 // sparc/solaris for certain applications, but would gain from
1628 // further optimization and tuning efforts, and would almost
1629 // certainly gain from analysis of platform and environment.
1630 void Arguments::set_cms_and_parnew_gc_flags() {
1631 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1632 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1633 assert(UseParNewGC, "ParNew should always be used with CMS");
1634
1635 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1636 disable_adaptive_size_policy("UseConcMarkSweepGC");
1637
1638 set_parnew_gc_flags();
1639
1640 size_t max_heap = align_size_down(MaxHeapSize,
1641 CardTableRS::ct_max_alignment_constraint());
1642
1643 // Now make adjustments for CMS
1644 intx tenuring_default = (intx)6;
1645 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1646
1647 // Preferred young gen size for "short" pauses:
1648 // upper bound depends on # of threads and NewRatio.
1649 const size_t preferred_max_new_size_unaligned =
1650 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1651 size_t preferred_max_new_size =
1652 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1653
1654 // Unless explicitly requested otherwise, size young gen
1655 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1656
1657 // If either MaxNewSize or NewRatio is set on the command line,
1658 // assume the user is trying to set the size of the young gen.
1659 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1660
1661 // Set MaxNewSize to our calculated preferred_max_new_size unless
1662 // NewSize was set on the command line and it is larger than
1663 // preferred_max_new_size.
1664 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1665 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1666 } else {
1667 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1668 }
1669 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1670
1671 // Code along this path potentially sets NewSize and OldSize
1672 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1673 min_heap_size(), InitialHeapSize, max_heap);
1674 size_t min_new = preferred_max_new_size;
1675 if (FLAG_IS_CMDLINE(NewSize)) {
1676 min_new = NewSize;
1677 }
1678 if (max_heap > min_new && min_heap_size() > min_new) {
1679 // Unless explicitly requested otherwise, make young gen
1680 // at least min_new, and at most preferred_max_new_size.
1681 if (FLAG_IS_DEFAULT(NewSize)) {
1682 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1683 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1684 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1685 }
1686 // Unless explicitly requested otherwise, size old gen
1687 // so it's NewRatio x of NewSize.
1688 if (FLAG_IS_DEFAULT(OldSize)) {
1689 if (max_heap > NewSize) {
1690 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1691 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1692 }
1693 }
1694 }
1695 }
1696 // Unless explicitly requested otherwise, definitely
1697 // promote all objects surviving "tenuring_default" scavenges.
1698 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1699 FLAG_IS_DEFAULT(SurvivorRatio)) {
1700 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1701 }
1702 // If we decided above (or user explicitly requested)
1703 // `promote all' (via MaxTenuringThreshold := 0),
1704 // prefer minuscule survivor spaces so as not to waste
1705 // space for (non-existent) survivors
1706 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1707 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1708 }
1709
1710 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1711 // but rather the number of free blocks of a given size that are used when
1712 // replenishing the local per-worker free list caches.
1713 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1714 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1715 // OldPLAB sizing manually turned off: Use a larger default setting,
1716 // unless it was manually specified. This is because a too-low value
1717 // will slow down scavenges.
1718 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1719 } else {
1720 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1721 }
1722 }
1723
1724 // If either of the static initialization defaults have changed, note this
1725 // modification.
1726 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1727 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1728 }
1729
1730 if (!ClassUnloading) {
1731 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1732 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1733 }
1734
1735 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1736 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1737 }
1738 #endif // INCLUDE_ALL_GCS
1739
1740 void set_object_alignment() {
1741 // Object alignment.
1742 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1743 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1744 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1745 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1746 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1747 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1748
1749 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1750 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1751
1752 // Oop encoding heap max
1753 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1754
1755 if (SurvivorAlignmentInBytes == 0) {
1756 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1757 }
1758
1759 #if INCLUDE_ALL_GCS
1760 // Set CMS global values
1761 CompactibleFreeListSpace::set_cms_values();
1762 #endif // INCLUDE_ALL_GCS
1763 }
1764
1765 size_t Arguments::max_heap_for_compressed_oops() {
1766 // Avoid sign flip.
1767 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1768 // We need to fit both the NULL page and the heap into the memory budget, while
1769 // keeping alignment constraints of the heap. To guarantee the latter, as the
1770 // NULL page is located before the heap, we pad the NULL page to the conservative
1771 // maximum alignment that the GC may ever impose upon the heap.
1772 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1773 _conservative_max_heap_alignment);
1774
1775 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1776 NOT_LP64(ShouldNotReachHere(); return 0);
1777 }
1778
1779 bool Arguments::should_auto_select_low_pause_collector() {
1780 if (UseAutoGCSelectPolicy &&
1781 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1782 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1783 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1784 return true;
1785 }
1786 return false;
1787 }
1788
1789 void Arguments::set_use_compressed_oops() {
1790 #ifndef ZERO
1791 #ifdef _LP64
1792 // MaxHeapSize is not set up properly at this point, but
1793 // the only value that can override MaxHeapSize if we are
1794 // to use UseCompressedOops is InitialHeapSize.
1795 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1796
1797 if (max_heap_size <= max_heap_for_compressed_oops()) {
1798 #if !defined(COMPILER1) || defined(TIERED)
1799 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1800 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1801 }
1802 #endif
1803 } else {
1804 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1805 warning("Max heap size too large for Compressed Oops");
1806 FLAG_SET_DEFAULT(UseCompressedOops, false);
1807 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1808 }
1809 }
1810 #endif // _LP64
1811 #endif // ZERO
1812 }
1813
1814
1815 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1816 // set_use_compressed_oops().
1817 void Arguments::set_use_compressed_klass_ptrs() {
1818 #ifndef ZERO
1819 #ifdef _LP64
1820 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1821 if (!UseCompressedOops) {
1822 if (UseCompressedClassPointers) {
1823 warning("UseCompressedClassPointers requires UseCompressedOops");
1824 }
1825 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1826 } else {
1827 // Turn on UseCompressedClassPointers too
1828 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1829 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1830 }
1831 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1832 if (UseCompressedClassPointers) {
1833 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1834 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1835 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1836 }
1837 }
1838 }
1839 #endif // _LP64
1840 #endif // !ZERO
1841 }
1842
1843 void Arguments::set_conservative_max_heap_alignment() {
1844 // The conservative maximum required alignment for the heap is the maximum of
1845 // the alignments imposed by several sources: any requirements from the heap
1846 // itself, the collector policy and the maximum page size we may run the VM
1847 // with.
1848 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1849 #if INCLUDE_ALL_GCS
1850 if (UseParallelGC) {
1851 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1852 } else if (UseG1GC) {
1853 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1854 }
1855 #endif // INCLUDE_ALL_GCS
1856 _conservative_max_heap_alignment = MAX4(heap_alignment,
1857 (size_t)os::vm_allocation_granularity(),
1858 os::max_page_size(),
1859 CollectorPolicy::compute_heap_alignment());
1860 }
1861
1862 void Arguments::select_gc_ergonomically() {
1863 if (os::is_server_class_machine()) {
1864 if (should_auto_select_low_pause_collector()) {
1865 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1866 } else {
1867 #if defined(JAVASE_EMBEDDED)
1868 FLAG_SET_ERGO(bool, UseParallelGC, true);
1869 #else
1870 FLAG_SET_ERGO(bool, UseG1GC, true);
1871 #endif
1872 }
1873 } else {
1874 FLAG_SET_ERGO(bool, UseSerialGC, true);
1875 }
1876 }
1877
1878 void Arguments::select_gc() {
1879 if (!gc_selected()) {
1880 select_gc_ergonomically();
1881 guarantee(gc_selected(), "No GC selected");
1882 }
1883 }
1884
1885 void Arguments::set_ergonomics_flags() {
1886 select_gc();
1887
1888 #if defined(COMPILER2) || INCLUDE_JVMCI
1889 // Shared spaces work fine with other GCs but causes bytecode rewriting
1890 // to be disabled, which hurts interpreter performance and decreases
1891 // server performance. When -server is specified, keep the default off
1892 // unless it is asked for. Future work: either add bytecode rewriting
1893 // at link time, or rewrite bytecodes in non-shared methods.
1894 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1895 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1896 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1897 }
1898 #endif
1899
1900 set_conservative_max_heap_alignment();
1901
1902 #ifndef ZERO
1903 #ifdef _LP64
1904 set_use_compressed_oops();
1905
1906 // set_use_compressed_klass_ptrs() must be called after calling
1907 // set_use_compressed_oops().
1908 set_use_compressed_klass_ptrs();
1909
1910 // Also checks that certain machines are slower with compressed oops
1911 // in vm_version initialization code.
1912 #endif // _LP64
1913 #endif // !ZERO
1914
1915 CodeCacheExtensions::set_ergonomics_flags();
1916 }
1917
1918 void Arguments::set_parallel_gc_flags() {
1919 assert(UseParallelGC || UseParallelOldGC, "Error");
1920 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1921 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1922 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1923 }
1924 FLAG_SET_DEFAULT(UseParallelGC, true);
1925
1926 // If no heap maximum was requested explicitly, use some reasonable fraction
1927 // of the physical memory, up to a maximum of 1GB.
1928 FLAG_SET_DEFAULT(ParallelGCThreads,
1929 Abstract_VM_Version::parallel_worker_threads());
1930 if (ParallelGCThreads == 0) {
1931 jio_fprintf(defaultStream::error_stream(),
1932 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1933 vm_exit(1);
1934 }
1935
1936 if (UseAdaptiveSizePolicy) {
1937 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1938 // unless the user actually sets these flags.
1939 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1940 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1941 }
1942 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1943 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1944 }
1945 }
1946
1947 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1948 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1949 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1950 // See CR 6362902 for details.
1951 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1952 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1953 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1954 }
1955 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1956 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1957 }
1958 }
1959
1960 if (UseParallelOldGC) {
1961 // Par compact uses lower default values since they are treated as
1962 // minimums. These are different defaults because of the different
1963 // interpretation and are not ergonomically set.
1964 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1965 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1966 }
1967 }
1968 }
1969
1970 void Arguments::set_g1_gc_flags() {
1971 assert(UseG1GC, "Error");
1972 #if defined(COMPILER1) || INCLUDE_JVMCI
1973 FastTLABRefill = false;
1974 #endif
1975 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1976 if (ParallelGCThreads == 0) {
1977 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1978 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1979 }
1980
1981 #if INCLUDE_ALL_GCS
1982 if (G1ConcRefinementThreads == 0) {
1983 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1984 }
1985 #endif
1986
1987 // MarkStackSize will be set (if it hasn't been set by the user)
1988 // when concurrent marking is initialized.
1989 // Its value will be based upon the number of parallel marking threads.
1990 // But we do set the maximum mark stack size here.
1991 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1992 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1993 }
1994
1995 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1996 // In G1, we want the default GC overhead goal to be higher than
1997 // it is for PS, or the heap might be expanded too aggressively.
1998 // We set it here to ~8%.
1999 FLAG_SET_DEFAULT(GCTimeRatio, 12);
2000 }
2001
2002 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
2003 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
2004 }
2005
2006 #if !INCLUDE_ALL_GCS
2007 #ifdef ASSERT
2008 static bool verify_serial_gc_flags() {
2009 return (UseSerialGC &&
2010 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
2011 UseParallelGC || UseParallelOldGC));
2012 }
2013 #endif // ASSERT
2014 #endif // INCLUDE_ALL_GCS
2015
2016 void Arguments::set_gc_specific_flags() {
2017 #if INCLUDE_ALL_GCS
2018 // Set per-collector flags
2019 if (UseParallelGC || UseParallelOldGC) {
2020 set_parallel_gc_flags();
2021 } else if (UseConcMarkSweepGC) {
2022 set_cms_and_parnew_gc_flags();
2023 } else if (UseG1GC) {
2024 set_g1_gc_flags();
2025 }
2026 if (AssumeMP && !UseSerialGC) {
2027 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2028 warning("If the number of processors is expected to increase from one, then"
2029 " you should configure the number of parallel GC threads appropriately"
2030 " using -XX:ParallelGCThreads=N");
2031 }
2032 }
2033 if (MinHeapFreeRatio == 100) {
2034 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2035 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2036 }
2037 #else // INCLUDE_ALL_GCS
2038 assert(verify_serial_gc_flags(), "SerialGC unset");
2039 #endif // INCLUDE_ALL_GCS
2040 }
2041
2042 julong Arguments::limit_by_allocatable_memory(julong limit) {
2043 julong max_allocatable;
2044 julong result = limit;
2045 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2046 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2047 }
2048 return result;
2049 }
2050
2051 // Use static initialization to get the default before parsing
2052 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2053
2054 void Arguments::set_heap_size() {
2055 const julong phys_mem =
2056 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2057 : (julong)MaxRAM;
2058
2059 // If the maximum heap size has not been set with -Xmx,
2060 // then set it as fraction of the size of physical memory,
2061 // respecting the maximum and minimum sizes of the heap.
2062 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2063 julong reasonable_max = phys_mem / MaxRAMFraction;
2064
2065 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2066 // Small physical memory, so use a minimum fraction of it for the heap
2067 reasonable_max = phys_mem / MinRAMFraction;
2068 } else {
2069 // Not-small physical memory, so require a heap at least
2070 // as large as MaxHeapSize
2071 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2072 }
2073 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2074 // Limit the heap size to ErgoHeapSizeLimit
2075 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2076 }
2077 if (UseCompressedOops) {
2078 // Limit the heap size to the maximum possible when using compressed oops
2079 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2080
2081 // HeapBaseMinAddress can be greater than default but not less than.
2082 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2083 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2084 // matches compressed oops printing flags
2085 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2086 jio_fprintf(defaultStream::error_stream(),
2087 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2088 " (" SIZE_FORMAT "G) which is greater than value given "
2089 SIZE_FORMAT "\n",
2090 DefaultHeapBaseMinAddress,
2091 DefaultHeapBaseMinAddress/G,
2092 HeapBaseMinAddress);
2093 }
2094 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2095 }
2096 }
2097
2098 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2099 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2100 // but it should be not less than default MaxHeapSize.
2101 max_coop_heap -= HeapBaseMinAddress;
2102 }
2103 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2104 }
2105 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2106
2107 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2108 // An initial heap size was specified on the command line,
2109 // so be sure that the maximum size is consistent. Done
2110 // after call to limit_by_allocatable_memory because that
2111 // method might reduce the allocation size.
2112 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2113 }
2114
2115 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2116 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2117 }
2118
2119 // If the minimum or initial heap_size have not been set or requested to be set
2120 // ergonomically, set them accordingly.
2121 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2122 julong reasonable_minimum = (julong)(OldSize + NewSize);
2123
2124 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2125
2126 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2127
2128 if (InitialHeapSize == 0) {
2129 julong reasonable_initial = phys_mem / InitialRAMFraction;
2130
2131 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2132 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2133
2134 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2135
2136 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2137 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2138 }
2139 // If the minimum heap size has not been set (via -Xms),
2140 // synchronize with InitialHeapSize to avoid errors with the default value.
2141 if (min_heap_size() == 0) {
2142 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2143 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2144 }
2145 }
2146 }
2147
2148 // This option inspects the machine and attempts to set various
2149 // parameters to be optimal for long-running, memory allocation
2150 // intensive jobs. It is intended for machines with large
2151 // amounts of cpu and memory.
2152 jint Arguments::set_aggressive_heap_flags() {
2153 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2154 // VM, but we may not be able to represent the total physical memory
2155 // available (like having 8gb of memory on a box but using a 32bit VM).
2156 // Thus, we need to make sure we're using a julong for intermediate
2157 // calculations.
2158 julong initHeapSize;
2159 julong total_memory = os::physical_memory();
2160
2161 if (total_memory < (julong) 256 * M) {
2162 jio_fprintf(defaultStream::error_stream(),
2163 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2164 vm_exit(1);
2165 }
2166
2167 // The heap size is half of available memory, or (at most)
2168 // all of possible memory less 160mb (leaving room for the OS
2169 // when using ISM). This is the maximum; because adaptive sizing
2170 // is turned on below, the actual space used may be smaller.
2171
2172 initHeapSize = MIN2(total_memory / (julong) 2,
2173 total_memory - (julong) 160 * M);
2174
2175 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2176
2177 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2178 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2179 return JNI_EINVAL;
2180 }
2181 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2182 return JNI_EINVAL;
2183 }
2184 // Currently the minimum size and the initial heap sizes are the same.
2185 set_min_heap_size(initHeapSize);
2186 }
2187 if (FLAG_IS_DEFAULT(NewSize)) {
2188 // Make the young generation 3/8ths of the total heap.
2189 if (FLAG_SET_CMDLINE(size_t, NewSize,
2190 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2191 return JNI_EINVAL;
2192 }
2193 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2194 return JNI_EINVAL;
2195 }
2196 }
2197
2198 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2199 FLAG_SET_DEFAULT(UseLargePages, true);
2200 #endif
2201
2202 // Increase some data structure sizes for efficiency
2203 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2204 return JNI_EINVAL;
2205 }
2206 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2207 return JNI_EINVAL;
2208 }
2209 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2210 return JNI_EINVAL;
2211 }
2212
2213 // See the OldPLABSize comment below, but replace 'after promotion'
2214 // with 'after copying'. YoungPLABSize is the size of the survivor
2215 // space per-gc-thread buffers. The default is 4kw.
2216 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2217 return JNI_EINVAL;
2218 }
2219
2220 // OldPLABSize is the size of the buffers in the old gen that
2221 // UseParallelGC uses to promote live data that doesn't fit in the
2222 // survivor spaces. At any given time, there's one for each gc thread.
2223 // The default size is 1kw. These buffers are rarely used, since the
2224 // survivor spaces are usually big enough. For specjbb, however, there
2225 // are occasions when there's lots of live data in the young gen
2226 // and we end up promoting some of it. We don't have a definite
2227 // explanation for why bumping OldPLABSize helps, but the theory
2228 // is that a bigger PLAB results in retaining something like the
2229 // original allocation order after promotion, which improves mutator
2230 // locality. A minor effect may be that larger PLABs reduce the
2231 // number of PLAB allocation events during gc. The value of 8kw
2232 // was arrived at by experimenting with specjbb.
2233 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2234 return JNI_EINVAL;
2235 }
2236
2237 // Enable parallel GC and adaptive generation sizing
2238 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2239 return JNI_EINVAL;
2240 }
2241 FLAG_SET_DEFAULT(ParallelGCThreads,
2242 Abstract_VM_Version::parallel_worker_threads());
2243
2244 // Encourage steady state memory management
2245 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2246 return JNI_EINVAL;
2247 }
2248
2249 // This appears to improve mutator locality
2250 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2251 return JNI_EINVAL;
2252 }
2253
2254 // Get around early Solaris scheduling bug
2255 // (affinity vs other jobs on system)
2256 // but disallow DR and offlining (5008695).
2257 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2258 return JNI_EINVAL;
2259 }
2260
2261 return JNI_OK;
2262 }
2263
2264 // This must be called after ergonomics.
2265 void Arguments::set_bytecode_flags() {
2266 if (!RewriteBytecodes) {
2267 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2268 }
2269 }
2270
2271 // Aggressive optimization flags -XX:+AggressiveOpts
2272 jint Arguments::set_aggressive_opts_flags() {
2273 #ifdef COMPILER2
2274 if (AggressiveUnboxing) {
2275 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2276 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2277 } else if (!EliminateAutoBox) {
2278 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2279 AggressiveUnboxing = false;
2280 }
2281 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2282 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2283 } else if (!DoEscapeAnalysis) {
2284 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2285 AggressiveUnboxing = false;
2286 }
2287 }
2288 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2289 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2290 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2291 }
2292 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2293 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2294 }
2295
2296 // Feed the cache size setting into the JDK
2297 char buffer[1024];
2298 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2299 if (!add_property(buffer)) {
2300 return JNI_ENOMEM;
2301 }
2302 }
2303 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2304 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2305 }
2306 #endif
2307
2308 if (AggressiveOpts) {
2309 // Sample flag setting code
2310 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2311 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2312 // }
2313 }
2314
2315 return JNI_OK;
2316 }
2317
2318 //===========================================================================================================
2319 // Parsing of java.compiler property
2320
2321 void Arguments::process_java_compiler_argument(const char* arg) {
2322 // For backwards compatibility, Djava.compiler=NONE or ""
2323 // causes us to switch to -Xint mode UNLESS -Xdebug
2324 // is also specified.
2325 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2326 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2327 }
2328 }
2329
2330 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2331 _sun_java_launcher = os::strdup_check_oom(launcher);
2332 }
2333
2334 bool Arguments::created_by_java_launcher() {
2335 assert(_sun_java_launcher != NULL, "property must have value");
2336 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2337 }
2338
2339 bool Arguments::sun_java_launcher_is_altjvm() {
2340 return _sun_java_launcher_is_altjvm;
2341 }
2342
2343 //===========================================================================================================
2344 // Parsing of main arguments
2345
2346 #if INCLUDE_JVMCI
2347 // Check consistency of jvmci vm argument settings.
2348 bool Arguments::check_jvmci_args_consistency() {
2349 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2350 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2351 return false;
2352 }
2353 return true;
2354 }
2355 #endif //INCLUDE_JVMCI
2356
2357 // Check consistency of GC selection
2358 bool Arguments::check_gc_consistency() {
2359 // Ensure that the user has not selected conflicting sets
2360 // of collectors.
2361 uint i = 0;
2362 if (UseSerialGC) i++;
2363 if (UseConcMarkSweepGC) i++;
2364 if (UseParallelGC || UseParallelOldGC) i++;
2365 if (UseG1GC) i++;
2366 if (i > 1) {
2367 jio_fprintf(defaultStream::error_stream(),
2368 "Conflicting collector combinations in option list; "
2369 "please refer to the release notes for the combinations "
2370 "allowed\n");
2371 return false;
2372 }
2373
2374 if (UseConcMarkSweepGC && !UseParNewGC) {
2375 jio_fprintf(defaultStream::error_stream(),
2376 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2377 return false;
2378 }
2379
2380 if (UseParNewGC && !UseConcMarkSweepGC) {
2381 jio_fprintf(defaultStream::error_stream(),
2382 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2383 return false;
2384 }
2385
2386 return true;
2387 }
2388
2389 // Check the consistency of vm_init_args
2390 bool Arguments::check_vm_args_consistency() {
2391 // Method for adding checks for flag consistency.
2392 // The intent is to warn the user of all possible conflicts,
2393 // before returning an error.
2394 // Note: Needs platform-dependent factoring.
2395 bool status = true;
2396
2397 if (TLABRefillWasteFraction == 0) {
2398 jio_fprintf(defaultStream::error_stream(),
2399 "TLABRefillWasteFraction should be a denominator, "
2400 "not " SIZE_FORMAT "\n",
2401 TLABRefillWasteFraction);
2402 status = false;
2403 }
2404
2405 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2406 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2407 }
2408
2409 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2410 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2411 }
2412
2413 if (GCTimeLimit == 100) {
2414 // Turn off gc-overhead-limit-exceeded checks
2415 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2416 }
2417
2418 status = status && check_gc_consistency();
2419
2420 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2421 // insists that we hold the requisite locks so that the iteration is
2422 // MT-safe. For the verification at start-up and shut-down, we don't
2423 // yet have a good way of acquiring and releasing these locks,
2424 // which are not visible at the CollectedHeap level. We want to
2425 // be able to acquire these locks and then do the iteration rather
2426 // than just disable the lock verification. This will be fixed under
2427 // bug 4788986.
2428 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2429 if (VerifyDuringStartup) {
2430 warning("Heap verification at start-up disabled "
2431 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2432 VerifyDuringStartup = false; // Disable verification at start-up
2433 }
2434
2435 if (VerifyBeforeExit) {
2436 warning("Heap verification at shutdown disabled "
2437 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2438 VerifyBeforeExit = false; // Disable verification at shutdown
2439 }
2440 }
2441
2442 if (PrintNMTStatistics) {
2443 #if INCLUDE_NMT
2444 if (MemTracker::tracking_level() == NMT_off) {
2445 #endif // INCLUDE_NMT
2446 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2447 PrintNMTStatistics = false;
2448 #if INCLUDE_NMT
2449 }
2450 #endif
2451 }
2452 #if INCLUDE_JVMCI
2453
2454 status = status && check_jvmci_args_consistency();
2455
2456 if (EnableJVMCI) {
2457 if (!ScavengeRootsInCode) {
2458 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2459 ScavengeRootsInCode = 1;
2460 }
2461 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2462 TypeProfileLevel = 0;
2463 }
2464 if (UseJVMCICompiler) {
2465 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2466 TypeProfileWidth = 8;
2467 }
2468 }
2469 }
2470 #endif
2471
2472 // Check lower bounds of the code cache
2473 // Template Interpreter code is approximately 3X larger in debug builds.
2474 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2475 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2476 jio_fprintf(defaultStream::error_stream(),
2477 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2478 os::vm_page_size()/K);
2479 status = false;
2480 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2481 jio_fprintf(defaultStream::error_stream(),
2482 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2483 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2484 status = false;
2485 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2488 min_code_cache_size/K);
2489 status = false;
2490 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2491 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2492 jio_fprintf(defaultStream::error_stream(),
2493 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2494 CODE_CACHE_SIZE_LIMIT/M);
2495 status = false;
2496 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2497 jio_fprintf(defaultStream::error_stream(),
2498 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2499 min_code_cache_size/K);
2500 status = false;
2501 }
2502
2503 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2504 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2505 }
2506
2507 #ifndef SUPPORT_RESERVED_STACK_AREA
2508 if (StackReservedPages != 0) {
2509 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2510 warning("Reserved Stack Area not supported on this platform");
2511 }
2512 #endif
2513 return status;
2514 }
2515
2516 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2517 const char* option_type) {
2518 if (ignore) return false;
2519
2520 const char* spacer = " ";
2521 if (option_type == NULL) {
2522 option_type = ++spacer; // Set both to the empty string.
2523 }
2524
2525 if (os::obsolete_option(option)) {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "Obsolete %s%soption: %s\n", option_type, spacer,
2528 option->optionString);
2529 return false;
2530 } else {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Unrecognized %s%soption: %s\n", option_type, spacer,
2533 option->optionString);
2534 return true;
2535 }
2536 }
2537
2538 static const char* user_assertion_options[] = {
2539 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2540 };
2541
2542 static const char* system_assertion_options[] = {
2543 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2544 };
2545
2546 bool Arguments::parse_uintx(const char* value,
2547 uintx* uintx_arg,
2548 uintx min_size) {
2549
2550 // Check the sign first since atomull() parses only unsigned values.
2551 bool value_is_positive = !(*value == '-');
2552
2553 if (value_is_positive) {
2554 julong n;
2555 bool good_return = atomull(value, &n);
2556 if (good_return) {
2557 bool above_minimum = n >= min_size;
2558 bool value_is_too_large = n > max_uintx;
2559
2560 if (above_minimum && !value_is_too_large) {
2561 *uintx_arg = n;
2562 return true;
2563 }
2564 }
2565 }
2566 return false;
2567 }
2568
2569 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2570 julong* long_arg,
2571 julong min_size) {
2572 if (!atomull(s, long_arg)) return arg_unreadable;
2573 return check_memory_size(*long_arg, min_size);
2574 }
2575
2576 // Parse JavaVMInitArgs structure
2577
2578 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2579 const JavaVMInitArgs *java_options_args,
2580 const JavaVMInitArgs *cmd_line_args) {
2581 // For components of the system classpath.
2582 SysClassPath scp(Arguments::get_sysclasspath());
2583 bool scp_assembly_required = false;
2584
2585 // Save default settings for some mode flags
2586 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2587 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2588 Arguments::_ClipInlining = ClipInlining;
2589 Arguments::_BackgroundCompilation = BackgroundCompilation;
2590 if (TieredCompilation) {
2591 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2592 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2593 }
2594
2595 // Setup flags for mixed which is the default
2596 set_mode_flags(_mixed);
2597
2598 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2599 // variable (if present).
2600 jint result = parse_each_vm_init_arg(
2601 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2602 if (result != JNI_OK) {
2603 return result;
2604 }
2605
2606 // Parse args structure generated from the command line flags.
2607 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2608 Flag::COMMAND_LINE);
2609 if (result != JNI_OK) {
2610 return result;
2611 }
2612
2613 // Parse args structure generated from the _JAVA_OPTIONS environment
2614 // variable (if present) (mimics classic VM)
2615 result = parse_each_vm_init_arg(
2616 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2617 if (result != JNI_OK) {
2618 return result;
2619 }
2620
2621 // Do final processing now that all arguments have been parsed
2622 result = finalize_vm_init_args(&scp, scp_assembly_required);
2623 if (result != JNI_OK) {
2624 return result;
2625 }
2626
2627 return JNI_OK;
2628 }
2629
2630 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2631 // represents a valid JDWP agent. is_path==true denotes that we
2632 // are dealing with -agentpath (case where name is a path), otherwise with
2633 // -agentlib
2634 bool valid_jdwp_agent(char *name, bool is_path) {
2635 char *_name;
2636 const char *_jdwp = "jdwp";
2637 size_t _len_jdwp, _len_prefix;
2638
2639 if (is_path) {
2640 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2641 return false;
2642 }
2643
2644 _name++; // skip past last path separator
2645 _len_prefix = strlen(JNI_LIB_PREFIX);
2646
2647 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2648 return false;
2649 }
2650
2651 _name += _len_prefix;
2652 _len_jdwp = strlen(_jdwp);
2653
2654 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2655 _name += _len_jdwp;
2656 }
2657 else {
2658 return false;
2659 }
2660
2661 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2662 return false;
2663 }
2664
2665 return true;
2666 }
2667
2668 if (strcmp(name, _jdwp) == 0) {
2669 return true;
2670 }
2671
2672 return false;
2673 }
2674
2675 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2676 SysClassPath* scp_p,
2677 bool* scp_assembly_required_p,
2678 Flag::Flags origin) {
2679 // For match_option to return remaining or value part of option string
2680 const char* tail;
2681
2682 // iterate over arguments
2683 for (int index = 0; index < args->nOptions; index++) {
2684 bool is_absolute_path = false; // for -agentpath vs -agentlib
2685
2686 const JavaVMOption* option = args->options + index;
2687
2688 if (!match_option(option, "-Djava.class.path", &tail) &&
2689 !match_option(option, "-Dsun.java.command", &tail) &&
2690 !match_option(option, "-Dsun.java.launcher", &tail)) {
2691
2692 // add all jvm options to the jvm_args string. This string
2693 // is used later to set the java.vm.args PerfData string constant.
2694 // the -Djava.class.path and the -Dsun.java.command options are
2695 // omitted from jvm_args string as each have their own PerfData
2696 // string constant object.
2697 build_jvm_args(option->optionString);
2698 }
2699
2700 // -verbose:[class/gc/jni]
2701 if (match_option(option, "-verbose", &tail)) {
2702 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2703 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload));
2704 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload));
2705 } else if (!strcmp(tail, ":gc")) {
2706 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2707 } else if (!strcmp(tail, ":jni")) {
2708 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 }
2712 // -da / -ea / -disableassertions / -enableassertions
2713 // These accept an optional class/package name separated by a colon, e.g.,
2714 // -da:java.lang.Thread.
2715 } else if (match_option(option, user_assertion_options, &tail, true)) {
2716 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2717 if (*tail == '\0') {
2718 JavaAssertions::setUserClassDefault(enable);
2719 } else {
2720 assert(*tail == ':', "bogus match by match_option()");
2721 JavaAssertions::addOption(tail + 1, enable);
2722 }
2723 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2724 } else if (match_option(option, system_assertion_options, &tail, false)) {
2725 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2726 JavaAssertions::setSystemClassDefault(enable);
2727 // -bootclasspath:
2728 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2729 scp_p->reset_path(tail);
2730 *scp_assembly_required_p = true;
2731 // -bootclasspath/a:
2732 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2733 scp_p->add_suffix(tail);
2734 *scp_assembly_required_p = true;
2735 // -bootclasspath/p:
2736 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2737 scp_p->add_prefix(tail);
2738 *scp_assembly_required_p = true;
2739 // -Xrun
2740 } else if (match_option(option, "-Xrun", &tail)) {
2741 if (tail != NULL) {
2742 const char* pos = strchr(tail, ':');
2743 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2744 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2745 name[len] = '\0';
2746
2747 char *options = NULL;
2748 if(pos != NULL) {
2749 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2750 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2751 }
2752 #if !INCLUDE_JVMTI
2753 if (strcmp(name, "jdwp") == 0) {
2754 jio_fprintf(defaultStream::error_stream(),
2755 "Debugging agents are not supported in this VM\n");
2756 return JNI_ERR;
2757 }
2758 #endif // !INCLUDE_JVMTI
2759 add_init_library(name, options);
2760 }
2761 // -agentlib and -agentpath
2762 } else if (match_option(option, "-agentlib:", &tail) ||
2763 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2764 if(tail != NULL) {
2765 const char* pos = strchr(tail, '=');
2766 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2767 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2768 name[len] = '\0';
2769
2770 char *options = NULL;
2771 if(pos != NULL) {
2772 options = os::strdup_check_oom(pos + 1, mtInternal);
2773 }
2774 #if !INCLUDE_JVMTI
2775 if (valid_jdwp_agent(name, is_absolute_path)) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Debugging agents are not supported in this VM\n");
2778 return JNI_ERR;
2779 }
2780 #endif // !INCLUDE_JVMTI
2781 add_init_agent(name, options, is_absolute_path);
2782 }
2783 // -javaagent
2784 } else if (match_option(option, "-javaagent:", &tail)) {
2785 #if !INCLUDE_JVMTI
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Instrumentation agents are not supported in this VM\n");
2788 return JNI_ERR;
2789 #else
2790 if(tail != NULL) {
2791 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2792 add_init_agent("instrument", options, false);
2793 }
2794 #endif // !INCLUDE_JVMTI
2795 // -Xnoclassgc
2796 } else if (match_option(option, "-Xnoclassgc")) {
2797 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 // -Xconcgc
2801 } else if (match_option(option, "-Xconcgc")) {
2802 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2803 return JNI_EINVAL;
2804 }
2805 // -Xnoconcgc
2806 } else if (match_option(option, "-Xnoconcgc")) {
2807 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2808 return JNI_EINVAL;
2809 }
2810 // -Xbatch
2811 } else if (match_option(option, "-Xbatch")) {
2812 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 // -Xmn for compatibility with other JVM vendors
2816 } else if (match_option(option, "-Xmn", &tail)) {
2817 julong long_initial_young_size = 0;
2818 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2819 if (errcode != arg_in_range) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "Invalid initial young generation size: %s\n", option->optionString);
2822 describe_range_error(errcode);
2823 return JNI_EINVAL;
2824 }
2825 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 // -Xms
2832 } else if (match_option(option, "-Xms", &tail)) {
2833 julong long_initial_heap_size = 0;
2834 // an initial heap size of 0 means automatically determine
2835 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2836 if (errcode != arg_in_range) {
2837 jio_fprintf(defaultStream::error_stream(),
2838 "Invalid initial heap size: %s\n", option->optionString);
2839 describe_range_error(errcode);
2840 return JNI_EINVAL;
2841 }
2842 set_min_heap_size((size_t)long_initial_heap_size);
2843 // Currently the minimum size and the initial heap sizes are the same.
2844 // Can be overridden with -XX:InitialHeapSize.
2845 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2846 return JNI_EINVAL;
2847 }
2848 // -Xmx
2849 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2850 julong long_max_heap_size = 0;
2851 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2852 if (errcode != arg_in_range) {
2853 jio_fprintf(defaultStream::error_stream(),
2854 "Invalid maximum heap size: %s\n", option->optionString);
2855 describe_range_error(errcode);
2856 return JNI_EINVAL;
2857 }
2858 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861 // Xmaxf
2862 } else if (match_option(option, "-Xmaxf", &tail)) {
2863 char* err;
2864 int maxf = (int)(strtod(tail, &err) * 100);
2865 if (*err != '\0' || *tail == '\0') {
2866 jio_fprintf(defaultStream::error_stream(),
2867 "Bad max heap free percentage size: %s\n",
2868 option->optionString);
2869 return JNI_EINVAL;
2870 } else {
2871 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2872 return JNI_EINVAL;
2873 }
2874 }
2875 // Xminf
2876 } else if (match_option(option, "-Xminf", &tail)) {
2877 char* err;
2878 int minf = (int)(strtod(tail, &err) * 100);
2879 if (*err != '\0' || *tail == '\0') {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Bad min heap free percentage size: %s\n",
2882 option->optionString);
2883 return JNI_EINVAL;
2884 } else {
2885 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 }
2889 // -Xss
2890 } else if (match_option(option, "-Xss", &tail)) {
2891 julong long_ThreadStackSize = 0;
2892 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2893 if (errcode != arg_in_range) {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Invalid thread stack size: %s\n", option->optionString);
2896 describe_range_error(errcode);
2897 return JNI_EINVAL;
2898 }
2899 // Internally track ThreadStackSize in units of 1024 bytes.
2900 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2901 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2902 return JNI_EINVAL;
2903 }
2904 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2905 } else if (match_option(option, "-Xoss", &tail) ||
2906 match_option(option, "-Xsqnopause") ||
2907 match_option(option, "-Xoptimize") ||
2908 match_option(option, "-Xboundthreads") ||
2909 match_option(option, "-Xusealtsigs")) {
2910 // All these options are deprecated in JDK 9 and will be removed in a future release
2911 char version[256];
2912 JDK_Version::jdk(9).to_string(version, sizeof(version));
2913 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2914 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2915 julong long_CodeCacheExpansionSize = 0;
2916 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2917 if (errcode != arg_in_range) {
2918 jio_fprintf(defaultStream::error_stream(),
2919 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2920 os::vm_page_size()/K);
2921 return JNI_EINVAL;
2922 }
2923 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2927 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2928 julong long_ReservedCodeCacheSize = 0;
2929
2930 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2931 if (errcode != arg_in_range) {
2932 jio_fprintf(defaultStream::error_stream(),
2933 "Invalid maximum code cache size: %s.\n", option->optionString);
2934 return JNI_EINVAL;
2935 }
2936 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 // -XX:NonNMethodCodeHeapSize=
2940 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2941 julong long_NonNMethodCodeHeapSize = 0;
2942
2943 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2944 if (errcode != arg_in_range) {
2945 jio_fprintf(defaultStream::error_stream(),
2946 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2947 return JNI_EINVAL;
2948 }
2949 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2950 return JNI_EINVAL;
2951 }
2952 // -XX:ProfiledCodeHeapSize=
2953 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2954 julong long_ProfiledCodeHeapSize = 0;
2955
2956 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2957 if (errcode != arg_in_range) {
2958 jio_fprintf(defaultStream::error_stream(),
2959 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2960 return JNI_EINVAL;
2961 }
2962 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2963 return JNI_EINVAL;
2964 }
2965 // -XX:NonProfiledCodeHeapSizee=
2966 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2967 julong long_NonProfiledCodeHeapSize = 0;
2968
2969 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2970 if (errcode != arg_in_range) {
2971 jio_fprintf(defaultStream::error_stream(),
2972 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2973 return JNI_EINVAL;
2974 }
2975 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2976 return JNI_EINVAL;
2977 }
2978 // -green
2979 } else if (match_option(option, "-green")) {
2980 jio_fprintf(defaultStream::error_stream(),
2981 "Green threads support not available\n");
2982 return JNI_EINVAL;
2983 // -native
2984 } else if (match_option(option, "-native")) {
2985 // HotSpot always uses native threads, ignore silently for compatibility
2986 // -Xrs
2987 } else if (match_option(option, "-Xrs")) {
2988 // Classic/EVM option, new functionality
2989 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992 // -Xprof
2993 } else if (match_option(option, "-Xprof")) {
2994 #if INCLUDE_FPROF
2995 _has_profile = true;
2996 #else // INCLUDE_FPROF
2997 jio_fprintf(defaultStream::error_stream(),
2998 "Flat profiling is not supported in this VM.\n");
2999 return JNI_ERR;
3000 #endif // INCLUDE_FPROF
3001 // -Xconcurrentio
3002 } else if (match_option(option, "-Xconcurrentio")) {
3003 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3007 return JNI_EINVAL;
3008 }
3009 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3010 return JNI_EINVAL;
3011 }
3012 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3016 return JNI_EINVAL;
3017 }
3018
3019 // -Xinternalversion
3020 } else if (match_option(option, "-Xinternalversion")) {
3021 jio_fprintf(defaultStream::output_stream(), "%s\n",
3022 VM_Version::internal_vm_info_string());
3023 vm_exit(0);
3024 #ifndef PRODUCT
3025 // -Xprintflags
3026 } else if (match_option(option, "-Xprintflags")) {
3027 CommandLineFlags::printFlags(tty, false);
3028 vm_exit(0);
3029 #endif
3030 // -D
3031 } else if (match_option(option, "-D", &tail)) {
3032 const char* value;
3033 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3034 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3035 // abort if -Djava.endorsed.dirs is set
3036 jio_fprintf(defaultStream::output_stream(),
3037 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3038 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3039 return JNI_EINVAL;
3040 }
3041 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3042 *value != '\0' && strcmp(value, "\"\"") != 0) {
3043 // abort if -Djava.ext.dirs is set
3044 jio_fprintf(defaultStream::output_stream(),
3045 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3046 return JNI_EINVAL;
3047 }
3048
3049 if (!add_property(tail)) {
3050 return JNI_ENOMEM;
3051 }
3052 // Out of the box management support
3053 if (match_option(option, "-Dcom.sun.management", &tail)) {
3054 #if INCLUDE_MANAGEMENT
3055 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3056 return JNI_EINVAL;
3057 }
3058 #else
3059 jio_fprintf(defaultStream::output_stream(),
3060 "-Dcom.sun.management is not supported in this VM.\n");
3061 return JNI_ERR;
3062 #endif
3063 }
3064 // -Xint
3065 } else if (match_option(option, "-Xint")) {
3066 set_mode_flags(_int);
3067 // -Xmixed
3068 } else if (match_option(option, "-Xmixed")) {
3069 set_mode_flags(_mixed);
3070 // -Xcomp
3071 } else if (match_option(option, "-Xcomp")) {
3072 // for testing the compiler; turn off all flags that inhibit compilation
3073 set_mode_flags(_comp);
3074 // -Xshare:dump
3075 } else if (match_option(option, "-Xshare:dump")) {
3076 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3077 return JNI_EINVAL;
3078 }
3079 set_mode_flags(_int); // Prevent compilation, which creates objects
3080 // -Xshare:on
3081 } else if (match_option(option, "-Xshare:on")) {
3082 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3083 return JNI_EINVAL;
3084 }
3085 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3086 return JNI_EINVAL;
3087 }
3088 // -Xshare:auto
3089 } else if (match_option(option, "-Xshare:auto")) {
3090 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3091 return JNI_EINVAL;
3092 }
3093 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3094 return JNI_EINVAL;
3095 }
3096 // -Xshare:off
3097 } else if (match_option(option, "-Xshare:off")) {
3098 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3099 return JNI_EINVAL;
3100 }
3101 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3102 return JNI_EINVAL;
3103 }
3104 // -Xverify
3105 } else if (match_option(option, "-Xverify", &tail)) {
3106 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3107 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3108 return JNI_EINVAL;
3109 }
3110 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3111 return JNI_EINVAL;
3112 }
3113 } else if (strcmp(tail, ":remote") == 0) {
3114 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3115 return JNI_EINVAL;
3116 }
3117 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3118 return JNI_EINVAL;
3119 }
3120 } else if (strcmp(tail, ":none") == 0) {
3121 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3128 return JNI_EINVAL;
3129 }
3130 // -Xdebug
3131 } else if (match_option(option, "-Xdebug")) {
3132 // note this flag has been used, then ignore
3133 set_xdebug_mode(true);
3134 // -Xnoagent
3135 } else if (match_option(option, "-Xnoagent")) {
3136 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3137 } else if (match_option(option, "-Xloggc:", &tail)) {
3138 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3139 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3140 _gc_log_filename = os::strdup_check_oom(tail);
3141 } else if (match_option(option, "-Xlog", &tail)) {
3142 bool ret = false;
3143 if (strcmp(tail, ":help") == 0) {
3144 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3145 vm_exit(0);
3146 } else if (strcmp(tail, ":disable") == 0) {
3147 LogConfiguration::disable_logging();
3148 ret = true;
3149 } else if (*tail == '\0') {
3150 ret = LogConfiguration::parse_command_line_arguments();
3151 assert(ret, "-Xlog without arguments should never fail to parse");
3152 } else if (*tail == ':') {
3153 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3154 }
3155 if (ret == false) {
3156 jio_fprintf(defaultStream::error_stream(),
3157 "Invalid -Xlog option '-Xlog%s'\n",
3158 tail);
3159 return JNI_EINVAL;
3160 }
3161 // JNI hooks
3162 } else if (match_option(option, "-Xcheck", &tail)) {
3163 if (!strcmp(tail, ":jni")) {
3164 #if !INCLUDE_JNI_CHECK
3165 warning("JNI CHECKING is not supported in this VM");
3166 #else
3167 CheckJNICalls = true;
3168 #endif // INCLUDE_JNI_CHECK
3169 } else if (is_bad_option(option, args->ignoreUnrecognized,
3170 "check")) {
3171 return JNI_EINVAL;
3172 }
3173 } else if (match_option(option, "vfprintf")) {
3174 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3175 } else if (match_option(option, "exit")) {
3176 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3177 } else if (match_option(option, "abort")) {
3178 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3179 // -XX:+AggressiveHeap
3180 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3181 jint result = set_aggressive_heap_flags();
3182 if (result != JNI_OK) {
3183 return result;
3184 }
3185 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3186 // and the last option wins.
3187 } else if (match_option(option, "-XX:+NeverTenure")) {
3188 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3189 return JNI_EINVAL;
3190 }
3191 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3192 return JNI_EINVAL;
3193 }
3194 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3195 return JNI_EINVAL;
3196 }
3197 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3198 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3205 return JNI_EINVAL;
3206 }
3207 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3208 uintx max_tenuring_thresh = 0;
3209 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3210 jio_fprintf(defaultStream::error_stream(),
3211 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3212 return JNI_EINVAL;
3213 }
3214
3215 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3216 return JNI_EINVAL;
3217 }
3218
3219 if (MaxTenuringThreshold == 0) {
3220 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3221 return JNI_EINVAL;
3222 }
3223 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 } else {
3227 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3228 return JNI_EINVAL;
3229 }
3230 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3231 return JNI_EINVAL;
3232 }
3233 }
3234 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3235 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3236 return JNI_EINVAL;
3237 }
3238 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3239 return JNI_EINVAL;
3240 }
3241 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3242 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3243 return JNI_EINVAL;
3244 }
3245 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3246 return JNI_EINVAL;
3247 }
3248 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3249 #if defined(DTRACE_ENABLED)
3250 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3251 return JNI_EINVAL;
3252 }
3253 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3254 return JNI_EINVAL;
3255 }
3256 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3257 return JNI_EINVAL;
3258 }
3259 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3260 return JNI_EINVAL;
3261 }
3262 #else // defined(DTRACE_ENABLED)
3263 jio_fprintf(defaultStream::error_stream(),
3264 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3265 return JNI_EINVAL;
3266 #endif // defined(DTRACE_ENABLED)
3267 #ifdef ASSERT
3268 } else if (match_option(option, "-XX:+FullGCALot")) {
3269 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3270 return JNI_EINVAL;
3271 }
3272 // disable scavenge before parallel mark-compact
3273 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3274 return JNI_EINVAL;
3275 }
3276 #endif
3277 #if !INCLUDE_MANAGEMENT
3278 } else if (match_option(option, "-XX:+ManagementServer")) {
3279 jio_fprintf(defaultStream::error_stream(),
3280 "ManagementServer is not supported in this VM.\n");
3281 return JNI_ERR;
3282 #endif // INCLUDE_MANAGEMENT
3283 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3284 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3285 // already been handled
3286 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3287 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3288 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3289 return JNI_EINVAL;
3290 }
3291 }
3292 // Unknown option
3293 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3294 return JNI_ERR;
3295 }
3296 }
3297
3298 // PrintSharedArchiveAndExit will turn on
3299 // -Xshare:on
3300 // -Xlog:classpath=info
3301 if (PrintSharedArchiveAndExit) {
3302 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3303 return JNI_EINVAL;
3304 }
3305 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3306 return JNI_EINVAL;
3307 }
3308 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classpath));
3309 }
3310
3311 // Change the default value for flags which have different default values
3312 // when working with older JDKs.
3313 #ifdef LINUX
3314 if (JDK_Version::current().compare_major(6) <= 0 &&
3315 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3316 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3317 }
3318 #endif // LINUX
3319 fix_appclasspath();
3320 return JNI_OK;
3321 }
3322
3323 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3324 //
3325 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3326 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3327 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3328 // path is treated as the current directory.
3329 //
3330 // This causes problems with CDS, which requires that all directories specified in the classpath
3331 // must be empty. In most cases, applications do NOT want to load classes from the current
3332 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3333 // scripts compatible with CDS.
3334 void Arguments::fix_appclasspath() {
3335 if (IgnoreEmptyClassPaths) {
3336 const char separator = *os::path_separator();
3337 const char* src = _java_class_path->value();
3338
3339 // skip over all the leading empty paths
3340 while (*src == separator) {
3341 src ++;
3342 }
3343
3344 char* copy = os::strdup_check_oom(src, mtInternal);
3345
3346 // trim all trailing empty paths
3347 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3348 *tail = '\0';
3349 }
3350
3351 char from[3] = {separator, separator, '\0'};
3352 char to [2] = {separator, '\0'};
3353 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3354 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3355 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3356 }
3357
3358 _java_class_path->set_value(copy);
3359 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3360 }
3361 }
3362
3363 static bool has_jar_files(const char* directory) {
3364 DIR* dir = os::opendir(directory);
3365 if (dir == NULL) return false;
3366
3367 struct dirent *entry;
3368 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3369 bool hasJarFile = false;
3370 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3371 const char* name = entry->d_name;
3372 const char* ext = name + strlen(name) - 4;
3373 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3374 }
3375 FREE_C_HEAP_ARRAY(char, dbuf);
3376 os::closedir(dir);
3377 return hasJarFile ;
3378 }
3379
3380 static int check_non_empty_dirs(const char* path) {
3381 const char separator = *os::path_separator();
3382 const char* const end = path + strlen(path);
3383 int nonEmptyDirs = 0;
3384 while (path < end) {
3385 const char* tmp_end = strchr(path, separator);
3386 if (tmp_end == NULL) {
3387 if (has_jar_files(path)) {
3388 nonEmptyDirs++;
3389 jio_fprintf(defaultStream::output_stream(),
3390 "Non-empty directory: %s\n", path);
3391 }
3392 path = end;
3393 } else {
3394 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3395 memcpy(dirpath, path, tmp_end - path);
3396 dirpath[tmp_end - path] = '\0';
3397 if (has_jar_files(dirpath)) {
3398 nonEmptyDirs++;
3399 jio_fprintf(defaultStream::output_stream(),
3400 "Non-empty directory: %s\n", dirpath);
3401 }
3402 FREE_C_HEAP_ARRAY(char, dirpath);
3403 path = tmp_end + 1;
3404 }
3405 }
3406 return nonEmptyDirs;
3407 }
3408
3409 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3410 // check if the default lib/endorsed directory exists; if so, error
3411 char path[JVM_MAXPATHLEN];
3412 const char* fileSep = os::file_separator();
3413 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3414
3415 if (CheckEndorsedAndExtDirs) {
3416 int nonEmptyDirs = 0;
3417 // check endorsed directory
3418 nonEmptyDirs += check_non_empty_dirs(path);
3419 // check the extension directories
3420 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3421 if (nonEmptyDirs > 0) {
3422 return JNI_ERR;
3423 }
3424 }
3425
3426 DIR* dir = os::opendir(path);
3427 if (dir != NULL) {
3428 jio_fprintf(defaultStream::output_stream(),
3429 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3430 "in modular form will be supported via the concept of upgradeable modules.\n");
3431 os::closedir(dir);
3432 return JNI_ERR;
3433 }
3434
3435 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3436 dir = os::opendir(path);
3437 if (dir != NULL) {
3438 jio_fprintf(defaultStream::output_stream(),
3439 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3440 "Use -classpath instead.\n.");
3441 os::closedir(dir);
3442 return JNI_ERR;
3443 }
3444
3445 if (scp_assembly_required) {
3446 // Assemble the bootclasspath elements into the final path.
3447 char *combined_path = scp_p->combined_path();
3448 Arguments::set_sysclasspath(combined_path);
3449 FREE_C_HEAP_ARRAY(char, combined_path);
3450 }
3451
3452 // This must be done after all arguments have been processed.
3453 // java_compiler() true means set to "NONE" or empty.
3454 if (java_compiler() && !xdebug_mode()) {
3455 // For backwards compatibility, we switch to interpreted mode if
3456 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3457 // not specified.
3458 set_mode_flags(_int);
3459 }
3460
3461 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3462 // but like -Xint, leave compilation thresholds unaffected.
3463 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3464 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3465 set_mode_flags(_int);
3466 }
3467
3468 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3469 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3470 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3471 }
3472
3473 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3474 // Don't degrade server performance for footprint
3475 if (FLAG_IS_DEFAULT(UseLargePages) &&
3476 MaxHeapSize < LargePageHeapSizeThreshold) {
3477 // No need for large granularity pages w/small heaps.
3478 // Note that large pages are enabled/disabled for both the
3479 // Java heap and the code cache.
3480 FLAG_SET_DEFAULT(UseLargePages, false);
3481 }
3482
3483 #elif defined(COMPILER2)
3484 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3485 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3486 }
3487 #endif
3488
3489 #ifndef TIERED
3490 // Tiered compilation is undefined.
3491 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3492 #endif
3493
3494 // If we are running in a headless jre, force java.awt.headless property
3495 // to be true unless the property has already been set.
3496 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3497 if (os::is_headless_jre()) {
3498 const char* headless = Arguments::get_property("java.awt.headless");
3499 if (headless == NULL) {
3500 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3501 if (headless_env == NULL) {
3502 if (!add_property("java.awt.headless=true")) {
3503 return JNI_ENOMEM;
3504 }
3505 } else {
3506 char buffer[256];
3507 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3508 if (!add_property(buffer)) {
3509 return JNI_ENOMEM;
3510 }
3511 }
3512 }
3513 }
3514
3515 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3516 // CMS can only be used with ParNew
3517 FLAG_SET_ERGO(bool, UseParNewGC, true);
3518 }
3519
3520 if (!check_vm_args_consistency()) {
3521 return JNI_ERR;
3522 }
3523
3524 return JNI_OK;
3525 }
3526
3527 // Helper class for controlling the lifetime of JavaVMInitArgs
3528 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3529 // deleted on the destruction of the ScopedVMInitArgs object.
3530 class ScopedVMInitArgs : public StackObj {
3531 private:
3532 JavaVMInitArgs _args;
3533 char* _container_name;
3534 bool _is_set;
3535 char* _vm_options_file_arg;
3536
3537 public:
3538 ScopedVMInitArgs(const char *container_name) {
3539 _args.version = JNI_VERSION_1_2;
3540 _args.nOptions = 0;
3541 _args.options = NULL;
3542 _args.ignoreUnrecognized = false;
3543 _container_name = (char *)container_name;
3544 _is_set = false;
3545 _vm_options_file_arg = NULL;
3546 }
3547
3548 // Populates the JavaVMInitArgs object represented by this
3549 // ScopedVMInitArgs object with the arguments in options. The
3550 // allocated memory is deleted by the destructor. If this method
3551 // returns anything other than JNI_OK, then this object is in a
3552 // partially constructed state, and should be abandoned.
3553 jint set_args(GrowableArray<JavaVMOption>* options) {
3554 _is_set = true;
3555 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3556 JavaVMOption, options->length(), mtInternal);
3557 if (options_arr == NULL) {
3558 return JNI_ENOMEM;
3559 }
3560 _args.options = options_arr;
3561
3562 for (int i = 0; i < options->length(); i++) {
3563 options_arr[i] = options->at(i);
3564 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3565 if (options_arr[i].optionString == NULL) {
3566 // Rely on the destructor to do cleanup.
3567 _args.nOptions = i;
3568 return JNI_ENOMEM;
3569 }
3570 }
3571
3572 _args.nOptions = options->length();
3573 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3574 return JNI_OK;
3575 }
3576
3577 JavaVMInitArgs* get() { return &_args; }
3578 char* container_name() { return _container_name; }
3579 bool is_set() { return _is_set; }
3580 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3581 char* vm_options_file_arg() { return _vm_options_file_arg; }
3582
3583 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3584 if (_vm_options_file_arg != NULL) {
3585 os::free(_vm_options_file_arg);
3586 }
3587 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3588 }
3589
3590 ~ScopedVMInitArgs() {
3591 if (_vm_options_file_arg != NULL) {
3592 os::free(_vm_options_file_arg);
3593 }
3594 if (_args.options == NULL) return;
3595 for (int i = 0; i < _args.nOptions; i++) {
3596 os::free(_args.options[i].optionString);
3597 }
3598 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3599 }
3600
3601 // Insert options into this option list, to replace option at
3602 // vm_options_file_pos (-XX:VMOptionsFile)
3603 jint insert(const JavaVMInitArgs* args,
3604 const JavaVMInitArgs* args_to_insert,
3605 const int vm_options_file_pos) {
3606 assert(_args.options == NULL, "shouldn't be set yet");
3607 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3608 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3609
3610 int length = args->nOptions + args_to_insert->nOptions - 1;
3611 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3612 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3613 for (int i = 0; i < args->nOptions; i++) {
3614 if (i == vm_options_file_pos) {
3615 // insert the new options starting at the same place as the
3616 // -XX:VMOptionsFile option
3617 for (int j = 0; j < args_to_insert->nOptions; j++) {
3618 options->push(args_to_insert->options[j]);
3619 }
3620 } else {
3621 options->push(args->options[i]);
3622 }
3623 }
3624 // make into options array
3625 jint result = set_args(options);
3626 delete options;
3627 return result;
3628 }
3629 };
3630
3631 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3632 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3633 }
3634
3635 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3636 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3637 }
3638
3639 jint Arguments::parse_options_environment_variable(const char* name,
3640 ScopedVMInitArgs* vm_args) {
3641 char *buffer = ::getenv(name);
3642
3643 // Don't check this environment variable if user has special privileges
3644 // (e.g. unix su command).
3645 if (buffer == NULL || os::have_special_privileges()) {
3646 return JNI_OK;
3647 }
3648
3649 if ((buffer = os::strdup(buffer)) == NULL) {
3650 return JNI_ENOMEM;
3651 }
3652
3653 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3654
3655 os::free(buffer);
3656 return retcode;
3657 }
3658
3659 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3660 // read file into buffer
3661 int fd = ::open(file_name, O_RDONLY);
3662 if (fd < 0) {
3663 jio_fprintf(defaultStream::error_stream(),
3664 "Could not open options file '%s'\n",
3665 file_name);
3666 return JNI_ERR;
3667 }
3668
3669 struct stat stbuf;
3670 int retcode = os::stat(file_name, &stbuf);
3671 if (retcode != 0) {
3672 jio_fprintf(defaultStream::error_stream(),
3673 "Could not stat options file '%s'\n",
3674 file_name);
3675 os::close(fd);
3676 return JNI_ERR;
3677 }
3678
3679 if (stbuf.st_size == 0) {
3680 // tell caller there is no option data and that is ok
3681 os::close(fd);
3682 return JNI_OK;
3683 }
3684
3685 // '+ 1' for NULL termination even with max bytes
3686 size_t bytes_alloc = stbuf.st_size + 1;
3687
3688 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3689 if (NULL == buf) {
3690 jio_fprintf(defaultStream::error_stream(),
3691 "Could not allocate read buffer for options file parse\n");
3692 os::close(fd);
3693 return JNI_ENOMEM;
3694 }
3695
3696 memset(buf, 0, bytes_alloc);
3697
3698 // Fill buffer
3699 // Use ::read() instead of os::read because os::read()
3700 // might do a thread state transition
3701 // and it is too early for that here
3702
3703 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3704 os::close(fd);
3705 if (bytes_read < 0) {
3706 FREE_C_HEAP_ARRAY(char, buf);
3707 jio_fprintf(defaultStream::error_stream(),
3708 "Could not read options file '%s'\n", file_name);
3709 return JNI_ERR;
3710 }
3711
3712 if (bytes_read == 0) {
3713 // tell caller there is no option data and that is ok
3714 FREE_C_HEAP_ARRAY(char, buf);
3715 return JNI_OK;
3716 }
3717
3718 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3719
3720 FREE_C_HEAP_ARRAY(char, buf);
3721 return retcode;
3722 }
3723
3724 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3725 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3726
3727 // some pointers to help with parsing
3728 char *buffer_end = buffer + buf_len;
3729 char *opt_hd = buffer;
3730 char *wrt = buffer;
3731 char *rd = buffer;
3732
3733 // parse all options
3734 while (rd < buffer_end) {
3735 // skip leading white space from the input string
3736 while (rd < buffer_end && isspace(*rd)) {
3737 rd++;
3738 }
3739
3740 if (rd >= buffer_end) {
3741 break;
3742 }
3743
3744 // Remember this is where we found the head of the token.
3745 opt_hd = wrt;
3746
3747 // Tokens are strings of non white space characters separated
3748 // by one or more white spaces.
3749 while (rd < buffer_end && !isspace(*rd)) {
3750 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3751 int quote = *rd; // matching quote to look for
3752 rd++; // don't copy open quote
3753 while (rd < buffer_end && *rd != quote) {
3754 // include everything (even spaces)
3755 // up until the close quote
3756 *wrt++ = *rd++; // copy to option string
3757 }
3758
3759 if (rd < buffer_end) {
3760 rd++; // don't copy close quote
3761 } else {
3762 // did not see closing quote
3763 jio_fprintf(defaultStream::error_stream(),
3764 "Unmatched quote in %s\n", name);
3765 delete options;
3766 return JNI_ERR;
3767 }
3768 } else {
3769 *wrt++ = *rd++; // copy to option string
3770 }
3771 }
3772
3773 // steal a white space character and set it to NULL
3774 *wrt++ = '\0';
3775 // We now have a complete token
3776
3777 JavaVMOption option;
3778 option.optionString = opt_hd;
3779 option.extraInfo = NULL;
3780
3781 options->append(option); // Fill in option
3782
3783 rd++; // Advance to next character
3784 }
3785
3786 // Fill out JavaVMInitArgs structure.
3787 jint status = vm_args->set_args(options);
3788
3789 delete options;
3790 return status;
3791 }
3792
3793 void Arguments::set_shared_spaces_flags() {
3794 if (DumpSharedSpaces) {
3795 if (RequireSharedSpaces) {
3796 warning("Cannot dump shared archive while using shared archive");
3797 }
3798 UseSharedSpaces = false;
3799 #ifdef _LP64
3800 if (!UseCompressedOops || !UseCompressedClassPointers) {
3801 vm_exit_during_initialization(
3802 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3803 }
3804 } else {
3805 if (!UseCompressedOops || !UseCompressedClassPointers) {
3806 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3807 }
3808 #endif
3809 }
3810 }
3811
3812 #if !INCLUDE_ALL_GCS
3813 static void force_serial_gc() {
3814 FLAG_SET_DEFAULT(UseSerialGC, true);
3815 UNSUPPORTED_GC_OPTION(UseG1GC);
3816 UNSUPPORTED_GC_OPTION(UseParallelGC);
3817 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3818 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3819 UNSUPPORTED_GC_OPTION(UseParNewGC);
3820 }
3821 #endif // INCLUDE_ALL_GCS
3822
3823 // Sharing support
3824 // Construct the path to the archive
3825 static char* get_shared_archive_path() {
3826 char *shared_archive_path;
3827 if (SharedArchiveFile == NULL) {
3828 char jvm_path[JVM_MAXPATHLEN];
3829 os::jvm_path(jvm_path, sizeof(jvm_path));
3830 char *end = strrchr(jvm_path, *os::file_separator());
3831 if (end != NULL) *end = '\0';
3832 size_t jvm_path_len = strlen(jvm_path);
3833 size_t file_sep_len = strlen(os::file_separator());
3834 const size_t len = jvm_path_len + file_sep_len + 20;
3835 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3836 if (shared_archive_path != NULL) {
3837 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3838 jvm_path, os::file_separator());
3839 }
3840 } else {
3841 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3842 }
3843 return shared_archive_path;
3844 }
3845
3846 #ifndef PRODUCT
3847 // Determine whether LogVMOutput should be implicitly turned on.
3848 static bool use_vm_log() {
3849 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3850 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3851 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3852 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3853 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3854 return true;
3855 }
3856
3857 #ifdef COMPILER1
3858 if (PrintC1Statistics) {
3859 return true;
3860 }
3861 #endif // COMPILER1
3862
3863 #ifdef COMPILER2
3864 if (PrintOptoAssembly || PrintOptoStatistics) {
3865 return true;
3866 }
3867 #endif // COMPILER2
3868
3869 return false;
3870 }
3871
3872 #endif // PRODUCT
3873
3874 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3875 for (int index = 0; index < args->nOptions; index++) {
3876 const JavaVMOption* option = args->options + index;
3877 const char* tail;
3878 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3879 return true;
3880 }
3881 }
3882 return false;
3883 }
3884
3885 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3886 const char* vm_options_file,
3887 const int vm_options_file_pos,
3888 ScopedVMInitArgs* vm_options_file_args,
3889 ScopedVMInitArgs* args_out) {
3890 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3891 if (code != JNI_OK) {
3892 return code;
3893 }
3894
3895 if (vm_options_file_args->get()->nOptions < 1) {
3896 return JNI_OK;
3897 }
3898
3899 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3900 jio_fprintf(defaultStream::error_stream(),
3901 "A VM options file may not refer to a VM options file. "
3902 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3903 "options file '%s' in options container '%s' is an error.\n",
3904 vm_options_file_args->vm_options_file_arg(),
3905 vm_options_file_args->container_name());
3906 return JNI_EINVAL;
3907 }
3908
3909 return args_out->insert(args, vm_options_file_args->get(),
3910 vm_options_file_pos);
3911 }
3912
3913 // Expand -XX:VMOptionsFile found in args_in as needed.
3914 // mod_args and args_out parameters may return values as needed.
3915 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3916 ScopedVMInitArgs* mod_args,
3917 JavaVMInitArgs** args_out) {
3918 jint code = match_special_option_and_act(args_in, mod_args);
3919 if (code != JNI_OK) {
3920 return code;
3921 }
3922
3923 if (mod_args->is_set()) {
3924 // args_in contains -XX:VMOptionsFile and mod_args contains the
3925 // original options from args_in along with the options expanded
3926 // from the VMOptionsFile. Return a short-hand to the caller.
3927 *args_out = mod_args->get();
3928 } else {
3929 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3930 }
3931 return JNI_OK;
3932 }
3933
3934 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3935 ScopedVMInitArgs* args_out) {
3936 // Remaining part of option string
3937 const char* tail;
3938 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3939
3940 for (int index = 0; index < args->nOptions; index++) {
3941 const JavaVMOption* option = args->options + index;
3942 if (ArgumentsExt::process_options(option)) {
3943 continue;
3944 }
3945 if (match_option(option, "-XX:Flags=", &tail)) {
3946 Arguments::set_jvm_flags_file(tail);
3947 continue;
3948 }
3949 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3950 if (vm_options_file_args.found_vm_options_file_arg()) {
3951 jio_fprintf(defaultStream::error_stream(),
3952 "The option '%s' is already specified in the options "
3953 "container '%s' so the specification of '%s' in the "
3954 "same options container is an error.\n",
3955 vm_options_file_args.vm_options_file_arg(),
3956 vm_options_file_args.container_name(),
3957 option->optionString);
3958 return JNI_EINVAL;
3959 }
3960 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3961 // If there's a VMOptionsFile, parse that
3962 jint code = insert_vm_options_file(args, tail, index,
3963 &vm_options_file_args, args_out);
3964 if (code != JNI_OK) {
3965 return code;
3966 }
3967 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3968 if (args_out->is_set()) {
3969 // The VMOptions file inserted some options so switch 'args'
3970 // to the new set of options, and continue processing which
3971 // preserves "last option wins" semantics.
3972 args = args_out->get();
3973 // The first option from the VMOptionsFile replaces the
3974 // current option. So we back track to process the
3975 // replacement option.
3976 index--;
3977 }
3978 continue;
3979 }
3980 if (match_option(option, "-XX:+PrintVMOptions")) {
3981 PrintVMOptions = true;
3982 continue;
3983 }
3984 if (match_option(option, "-XX:-PrintVMOptions")) {
3985 PrintVMOptions = false;
3986 continue;
3987 }
3988 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3989 IgnoreUnrecognizedVMOptions = true;
3990 continue;
3991 }
3992 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3993 IgnoreUnrecognizedVMOptions = false;
3994 continue;
3995 }
3996 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3997 CommandLineFlags::printFlags(tty, false);
3998 vm_exit(0);
3999 }
4000 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4001 #if INCLUDE_NMT
4002 // The launcher did not setup nmt environment variable properly.
4003 if (!MemTracker::check_launcher_nmt_support(tail)) {
4004 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4005 }
4006
4007 // Verify if nmt option is valid.
4008 if (MemTracker::verify_nmt_option()) {
4009 // Late initialization, still in single-threaded mode.
4010 if (MemTracker::tracking_level() >= NMT_summary) {
4011 MemTracker::init();
4012 }
4013 } else {
4014 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4015 }
4016 continue;
4017 #else
4018 jio_fprintf(defaultStream::error_stream(),
4019 "Native Memory Tracking is not supported in this VM\n");
4020 return JNI_ERR;
4021 #endif
4022 }
4023
4024 #ifndef PRODUCT
4025 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4026 CommandLineFlags::printFlags(tty, true);
4027 vm_exit(0);
4028 }
4029 #endif
4030 }
4031 return JNI_OK;
4032 }
4033
4034 static void print_options(const JavaVMInitArgs *args) {
4035 const char* tail;
4036 for (int index = 0; index < args->nOptions; index++) {
4037 const JavaVMOption *option = args->options + index;
4038 if (match_option(option, "-XX:", &tail)) {
4039 logOption(tail);
4040 }
4041 }
4042 }
4043
4044 bool Arguments::handle_deprecated_print_gc_flags() {
4045 if (PrintGC) {
4046 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4047 }
4048 if (PrintGCDetails) {
4049 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4050 }
4051
4052 if (_gc_log_filename != NULL) {
4053 // -Xloggc was used to specify a filename
4054 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4055 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4056 } else if (PrintGC || PrintGCDetails) {
4057 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4058 }
4059 return true;
4060 }
4061
4062 // Parse entry point called from JNI_CreateJavaVM
4063
4064 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4065 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4066
4067 // Initialize ranges and constraints
4068 CommandLineFlagRangeList::init();
4069 CommandLineFlagConstraintList::init();
4070
4071 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4072 const char* hotspotrc = ".hotspotrc";
4073 bool settings_file_specified = false;
4074 bool needs_hotspotrc_warning = false;
4075 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4076 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4077
4078 // Pointers to current working set of containers
4079 JavaVMInitArgs* cur_cmd_args;
4080 JavaVMInitArgs* cur_java_options_args;
4081 JavaVMInitArgs* cur_java_tool_options_args;
4082
4083 // Containers for modified/expanded options
4084 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4085 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4086 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4087
4088
4089 jint code =
4090 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4091 if (code != JNI_OK) {
4092 return code;
4093 }
4094
4095 code = parse_java_options_environment_variable(&initial_java_options_args);
4096 if (code != JNI_OK) {
4097 return code;
4098 }
4099
4100 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4101 &mod_java_tool_options_args,
4102 &cur_java_tool_options_args);
4103 if (code != JNI_OK) {
4104 return code;
4105 }
4106
4107 code = expand_vm_options_as_needed(initial_cmd_args,
4108 &mod_cmd_args,
4109 &cur_cmd_args);
4110 if (code != JNI_OK) {
4111 return code;
4112 }
4113
4114 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4115 &mod_java_options_args,
4116 &cur_java_options_args);
4117 if (code != JNI_OK) {
4118 return code;
4119 }
4120
4121 const char* flags_file = Arguments::get_jvm_flags_file();
4122 settings_file_specified = (flags_file != NULL);
4123
4124 if (IgnoreUnrecognizedVMOptions) {
4125 cur_cmd_args->ignoreUnrecognized = true;
4126 cur_java_tool_options_args->ignoreUnrecognized = true;
4127 cur_java_options_args->ignoreUnrecognized = true;
4128 }
4129
4130 // Parse specified settings file
4131 if (settings_file_specified) {
4132 if (!process_settings_file(flags_file, true,
4133 cur_cmd_args->ignoreUnrecognized)) {
4134 return JNI_EINVAL;
4135 }
4136 } else {
4137 #ifdef ASSERT
4138 // Parse default .hotspotrc settings file
4139 if (!process_settings_file(".hotspotrc", false,
4140 cur_cmd_args->ignoreUnrecognized)) {
4141 return JNI_EINVAL;
4142 }
4143 #else
4144 struct stat buf;
4145 if (os::stat(hotspotrc, &buf) == 0) {
4146 needs_hotspotrc_warning = true;
4147 }
4148 #endif
4149 }
4150
4151 if (PrintVMOptions) {
4152 print_options(cur_java_tool_options_args);
4153 print_options(cur_cmd_args);
4154 print_options(cur_java_options_args);
4155 }
4156
4157 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4158 jint result = parse_vm_init_args(cur_java_tool_options_args,
4159 cur_java_options_args,
4160 cur_cmd_args);
4161
4162 if (result != JNI_OK) {
4163 return result;
4164 }
4165
4166 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4167 SharedArchivePath = get_shared_archive_path();
4168 if (SharedArchivePath == NULL) {
4169 return JNI_ENOMEM;
4170 }
4171
4172 // Set up VerifySharedSpaces
4173 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4174 VerifySharedSpaces = true;
4175 }
4176
4177 // Delay warning until here so that we've had a chance to process
4178 // the -XX:-PrintWarnings flag
4179 if (needs_hotspotrc_warning) {
4180 warning("%s file is present but has been ignored. "
4181 "Run with -XX:Flags=%s to load the file.",
4182 hotspotrc, hotspotrc);
4183 }
4184
4185 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4186 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4187 #endif
4188
4189 ArgumentsExt::report_unsupported_options();
4190
4191 #ifndef PRODUCT
4192 if (TraceBytecodesAt != 0) {
4193 TraceBytecodes = true;
4194 }
4195 if (CountCompiledCalls) {
4196 if (UseCounterDecay) {
4197 warning("UseCounterDecay disabled because CountCalls is set");
4198 UseCounterDecay = false;
4199 }
4200 }
4201 #endif // PRODUCT
4202
4203 if (ScavengeRootsInCode == 0) {
4204 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4205 warning("Forcing ScavengeRootsInCode non-zero");
4206 }
4207 ScavengeRootsInCode = 1;
4208 }
4209
4210 if (!handle_deprecated_print_gc_flags()) {
4211 return JNI_EINVAL;
4212 }
4213
4214 // Set object alignment values.
4215 set_object_alignment();
4216
4217 #if !INCLUDE_ALL_GCS
4218 force_serial_gc();
4219 #endif // INCLUDE_ALL_GCS
4220 #if !INCLUDE_CDS
4221 if (DumpSharedSpaces || RequireSharedSpaces) {
4222 jio_fprintf(defaultStream::error_stream(),
4223 "Shared spaces are not supported in this VM\n");
4224 return JNI_ERR;
4225 }
4226 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4227 warning("Shared spaces are not supported in this VM");
4228 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4229 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4230 }
4231 no_shared_spaces("CDS Disabled");
4232 #endif // INCLUDE_CDS
4233
4234 return JNI_OK;
4235 }
4236
4237 jint Arguments::apply_ergo() {
4238
4239 // Set flags based on ergonomics.
4240 set_ergonomics_flags();
4241
4242 set_shared_spaces_flags();
4243
4244 // Check the GC selections again.
4245 if (!check_gc_consistency()) {
4246 return JNI_EINVAL;
4247 }
4248
4249 if (TieredCompilation) {
4250 set_tiered_flags();
4251 } else {
4252 int max_compilation_policy_choice = 1;
4253 #ifdef COMPILER2
4254 max_compilation_policy_choice = 2;
4255 #endif
4256 // Check if the policy is valid.
4257 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4258 vm_exit_during_initialization(
4259 "Incompatible compilation policy selected", NULL);
4260 }
4261 // Scale CompileThreshold
4262 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4263 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4264 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4265 }
4266 }
4267
4268 #ifdef COMPILER2
4269 #ifndef PRODUCT
4270 if (PrintIdealGraphLevel > 0) {
4271 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4272 }
4273 #endif
4274 #endif
4275
4276 // Set heap size based on available physical memory
4277 set_heap_size();
4278
4279 ArgumentsExt::set_gc_specific_flags();
4280
4281 // Initialize Metaspace flags and alignments
4282 Metaspace::ergo_initialize();
4283
4284 // Set bytecode rewriting flags
4285 set_bytecode_flags();
4286
4287 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4288 jint code = set_aggressive_opts_flags();
4289 if (code != JNI_OK) {
4290 return code;
4291 }
4292
4293 // Turn off biased locking for locking debug mode flags,
4294 // which are subtly different from each other but neither works with
4295 // biased locking
4296 if (UseHeavyMonitors
4297 #ifdef COMPILER1
4298 || !UseFastLocking
4299 #endif // COMPILER1
4300 #if INCLUDE_JVMCI
4301 || !JVMCIUseFastLocking
4302 #endif
4303 ) {
4304 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4305 // flag set to true on command line; warn the user that they
4306 // can't enable biased locking here
4307 warning("Biased Locking is not supported with locking debug flags"
4308 "; ignoring UseBiasedLocking flag." );
4309 }
4310 UseBiasedLocking = false;
4311 }
4312
4313 #ifdef CC_INTERP
4314 // Clear flags not supported on zero.
4315 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4316 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4317 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4318 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4319 #endif // CC_INTERP
4320
4321 #ifdef COMPILER2
4322 if (!EliminateLocks) {
4323 EliminateNestedLocks = false;
4324 }
4325 if (!Inline) {
4326 IncrementalInline = false;
4327 }
4328 #ifndef PRODUCT
4329 if (!IncrementalInline) {
4330 AlwaysIncrementalInline = false;
4331 }
4332 #endif
4333 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4334 // nothing to use the profiling, turn if off
4335 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4336 }
4337 #endif
4338
4339 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4340 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4341 DebugNonSafepoints = true;
4342 }
4343
4344 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4345 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4346 }
4347
4348 #ifndef PRODUCT
4349 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4350 if (use_vm_log()) {
4351 LogVMOutput = true;
4352 }
4353 }
4354 #endif // PRODUCT
4355
4356 if (PrintCommandLineFlags) {
4357 CommandLineFlags::printSetFlags(tty);
4358 }
4359
4360 // Apply CPU specific policy for the BiasedLocking
4361 if (UseBiasedLocking) {
4362 if (!VM_Version::use_biased_locking() &&
4363 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4364 UseBiasedLocking = false;
4365 }
4366 }
4367 #ifdef COMPILER2
4368 if (!UseBiasedLocking || EmitSync != 0) {
4369 UseOptoBiasInlining = false;
4370 }
4371 #endif
4372
4373 return JNI_OK;
4374 }
4375
4376 jint Arguments::adjust_after_os() {
4377 if (UseNUMA) {
4378 if (UseParallelGC || UseParallelOldGC) {
4379 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4380 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4381 }
4382 }
4383 // UseNUMAInterleaving is set to ON for all collectors and
4384 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4385 // such as the parallel collector for Linux and Solaris will
4386 // interleave old gen and survivor spaces on top of NUMA
4387 // allocation policy for the eden space.
4388 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4389 // all platforms and ParallelGC on Windows will interleave all
4390 // of the heap spaces across NUMA nodes.
4391 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4392 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4393 }
4394 }
4395 return JNI_OK;
4396 }
4397
4398 int Arguments::PropertyList_count(SystemProperty* pl) {
4399 int count = 0;
4400 while(pl != NULL) {
4401 count++;
4402 pl = pl->next();
4403 }
4404 return count;
4405 }
4406
4407 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4408 assert(key != NULL, "just checking");
4409 SystemProperty* prop;
4410 for (prop = pl; prop != NULL; prop = prop->next()) {
4411 if (strcmp(key, prop->key()) == 0) return prop->value();
4412 }
4413 return NULL;
4414 }
4415
4416 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4417 int count = 0;
4418 const char* ret_val = NULL;
4419
4420 while(pl != NULL) {
4421 if(count >= index) {
4422 ret_val = pl->key();
4423 break;
4424 }
4425 count++;
4426 pl = pl->next();
4427 }
4428
4429 return ret_val;
4430 }
4431
4432 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4433 int count = 0;
4434 char* ret_val = NULL;
4435
4436 while(pl != NULL) {
4437 if(count >= index) {
4438 ret_val = pl->value();
4439 break;
4440 }
4441 count++;
4442 pl = pl->next();
4443 }
4444
4445 return ret_val;
4446 }
4447
4448 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4449 SystemProperty* p = *plist;
4450 if (p == NULL) {
4451 *plist = new_p;
4452 } else {
4453 while (p->next() != NULL) {
4454 p = p->next();
4455 }
4456 p->set_next(new_p);
4457 }
4458 }
4459
4460 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4461 if (plist == NULL)
4462 return;
4463
4464 SystemProperty* new_p = new SystemProperty(k, v, true);
4465 PropertyList_add(plist, new_p);
4466 }
4467
4468 void Arguments::PropertyList_add(SystemProperty *element) {
4469 PropertyList_add(&_system_properties, element);
4470 }
4471
4472 // This add maintains unique property key in the list.
4473 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4474 if (plist == NULL)
4475 return;
4476
4477 // If property key exist then update with new value.
4478 SystemProperty* prop;
4479 for (prop = *plist; prop != NULL; prop = prop->next()) {
4480 if (strcmp(k, prop->key()) == 0) {
4481 if (append) {
4482 prop->append_value(v);
4483 } else {
4484 prop->set_value(v);
4485 }
4486 return;
4487 }
4488 }
4489
4490 PropertyList_add(plist, k, v);
4491 }
4492
4493 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4494 // Returns true if all of the source pointed by src has been copied over to
4495 // the destination buffer pointed by buf. Otherwise, returns false.
4496 // Notes:
4497 // 1. If the length (buflen) of the destination buffer excluding the
4498 // NULL terminator character is not long enough for holding the expanded
4499 // pid characters, it also returns false instead of returning the partially
4500 // expanded one.
4501 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4502 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4503 char* buf, size_t buflen) {
4504 const char* p = src;
4505 char* b = buf;
4506 const char* src_end = &src[srclen];
4507 char* buf_end = &buf[buflen - 1];
4508
4509 while (p < src_end && b < buf_end) {
4510 if (*p == '%') {
4511 switch (*(++p)) {
4512 case '%': // "%%" ==> "%"
4513 *b++ = *p++;
4514 break;
4515 case 'p': { // "%p" ==> current process id
4516 // buf_end points to the character before the last character so
4517 // that we could write '\0' to the end of the buffer.
4518 size_t buf_sz = buf_end - b + 1;
4519 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4520
4521 // if jio_snprintf fails or the buffer is not long enough to hold
4522 // the expanded pid, returns false.
4523 if (ret < 0 || ret >= (int)buf_sz) {
4524 return false;
4525 } else {
4526 b += ret;
4527 assert(*b == '\0', "fail in copy_expand_pid");
4528 if (p == src_end && b == buf_end + 1) {
4529 // reach the end of the buffer.
4530 return true;
4531 }
4532 }
4533 p++;
4534 break;
4535 }
4536 default :
4537 *b++ = '%';
4538 }
4539 } else {
4540 *b++ = *p++;
4541 }
4542 }
4543 *b = '\0';
4544 return (p == src_end); // return false if not all of the source was copied
4545 }