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