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