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