1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/universe.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiExport.hpp"
41 #include "runtime/arguments.hpp"
42 #include "runtime/arguments_ext.hpp"
43 #include "runtime/commandLineFlagConstraintList.hpp"
44 #include "runtime/commandLineFlagRangeList.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/globals_extension.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/os.hpp"
49 #include "runtime/vm_version.hpp"
50 #include "services/management.hpp"
51 #include "services/memTracker.hpp"
52 #include "utilities/defaultStream.hpp"
53 #include "utilities/macros.hpp"
54 #include "utilities/stringUtils.hpp"
55 #if INCLUDE_JVMCI
56 #include "jvmci/jvmciRuntime.hpp"
57 #endif
58 #if INCLUDE_ALL_GCS
59 #include "gc/cms/compactibleFreeListSpace.hpp"
60 #include "gc/g1/g1CollectedHeap.inline.hpp"
61 #include "gc/parallel/parallelScavengeHeap.hpp"
62 #endif // INCLUDE_ALL_GCS
63
64 // Note: This is a special bug reporting site for the JVM
65 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
66 #define DEFAULT_JAVA_LAUNCHER "generic"
67
68 #define UNSUPPORTED_GC_OPTION(gc) \
69 do { \
70 if (gc) { \
71 if (FLAG_IS_CMDLINE(gc)) { \
72 warning(#gc " is not supported in this VM. Using Serial GC."); \
73 } \
74 FLAG_SET_DEFAULT(gc, false); \
75 } \
76 } while(0)
77
78 char* Arguments::_jvm_flags_file = NULL;
79 char** Arguments::_jvm_flags_array = NULL;
80 int Arguments::_num_jvm_flags = 0;
81 char** Arguments::_jvm_args_array = NULL;
82 int Arguments::_num_jvm_args = 0;
83 char* Arguments::_java_command = NULL;
84 SystemProperty* Arguments::_system_properties = NULL;
85 bool Arguments::_has_profile = false;
86 size_t Arguments::_conservative_max_heap_alignment = 0;
87 size_t Arguments::_min_heap_size = 0;
88 Arguments::Mode Arguments::_mode = _mixed;
89 bool Arguments::_java_compiler = false;
90 bool Arguments::_xdebug_mode = false;
91 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
92 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
93 int Arguments::_sun_java_launcher_pid = -1;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
102 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
103
104 char* Arguments::SharedArchivePath = NULL;
105
106 AgentLibraryList Arguments::_libraryList;
107 AgentLibraryList Arguments::_agentList;
108
109 abort_hook_t Arguments::_abort_hook = NULL;
110 exit_hook_t Arguments::_exit_hook = NULL;
111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = NULL;
115 SystemProperty *Arguments::_java_library_path = NULL;
116 SystemProperty *Arguments::_java_home = NULL;
117 SystemProperty *Arguments::_java_class_path = NULL;
118 SystemProperty *Arguments::_sun_boot_class_path = NULL;
119
120 char* Arguments::_ext_dirs = NULL;
121
122 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
123 // part of the option string.
124 static bool match_option(const JavaVMOption *option, const char* name,
125 const char** tail) {
126 size_t len = strlen(name);
127 if (strncmp(option->optionString, name, len) == 0) {
128 *tail = option->optionString + len;
129 return true;
130 } else {
131 return false;
132 }
133 }
134
135 // Check if 'option' matches 'name'. No "tail" is allowed.
136 static bool match_option(const JavaVMOption *option, const char* name) {
137 const char* tail = NULL;
138 bool result = match_option(option, name, &tail);
139 if (tail != NULL && *tail == '\0') {
140 return result;
141 } else {
142 return false;
143 }
144 }
145
146 // Return true if any of the strings in null-terminated array 'names' matches.
147 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
148 // the option must match exactly.
149 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
150 bool tail_allowed) {
151 for (/* empty */; *names != NULL; ++names) {
152 if (match_option(option, *names, tail)) {
153 if (**tail == '\0' || tail_allowed && **tail == ':') {
154 return true;
155 }
156 }
157 }
158 return false;
159 }
160
161 static void logOption(const char* opt) {
162 if (PrintVMOptions) {
163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
164 }
165 }
166
167 // Process java launcher properties.
168 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
169 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
170 // sun.java.launcher.pid is defined.
171 // Must do this before setting up other system properties,
172 // as some of them may depend on launcher type.
173 for (int index = 0; index < args->nOptions; index++) {
174 const JavaVMOption* option = args->options + index;
175 const char* tail;
176
177 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
178 process_java_launcher_argument(tail, option->extraInfo);
179 continue;
180 }
181 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
182 if (strcmp(tail, "true") == 0) {
183 _sun_java_launcher_is_altjvm = true;
184 }
185 continue;
186 }
187 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
188 _sun_java_launcher_pid = atoi(tail);
189 continue;
190 }
191 }
192 }
193
194 // Initialize system properties key and value.
195 void Arguments::init_system_properties() {
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
197 "Java Virtual Machine Specification", false));
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
201 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
202
203 // Following are JVMTI agent writable properties.
204 // Properties values are set to NULL and they are
205 // os specific they are initialized in os::init_system_properties_values().
206 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
207 _java_library_path = new SystemProperty("java.library.path", NULL, true);
208 _java_home = new SystemProperty("java.home", NULL, true);
209 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
210
211 _java_class_path = new SystemProperty("java.class.path", "", true);
212
213 // Add to System Property list.
214 PropertyList_add(&_system_properties, _sun_boot_library_path);
215 PropertyList_add(&_system_properties, _java_library_path);
216 PropertyList_add(&_system_properties, _java_home);
217 PropertyList_add(&_system_properties, _java_class_path);
218 PropertyList_add(&_system_properties, _sun_boot_class_path);
219
220 // Set OS specific system properties values
221 os::init_system_properties_values();
222
223 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
224 }
225
226 // Update/Initialize System properties after JDK version number is known
227 void Arguments::init_version_specific_system_properties() {
228 enum { bufsz = 16 };
229 char buffer[bufsz];
230 const char* spec_vendor = "Oracle Corporation";
231 uint32_t spec_version = JDK_Version::current().major_version();
232
233 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
234
235 PropertyList_add(&_system_properties,
236 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
237 PropertyList_add(&_system_properties,
238 new SystemProperty("java.vm.specification.version", buffer, false));
239 PropertyList_add(&_system_properties,
240 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
241 }
242
243 /*
244 * -XX argument processing:
245 *
246 * -XX arguments are defined in several places, such as:
247 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
248 * -XX arguments are parsed in parse_argument().
249 * -XX argument bounds checking is done in check_vm_args_consistency().
250 *
251 * Over time -XX arguments may change. There are mechanisms to handle common cases:
252 *
253 * ALIASED: An option that is simply another name for another option. This is often
254 * part of the process of deprecating a flag, but not all aliases need
255 * to be deprecated.
256 *
257 * Create an alias for an option by adding the old and new option names to the
258 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
259 *
260 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
261 * support may be removed in the future. Both regular and aliased options may be
262 * deprecated.
263 *
264 * Add a deprecation warning for an option (or alias) by adding an entry in the
265 * "special_jvm_flags" table and setting the "deprecated_in" field.
266 * Often an option "deprecated" in one major release will
267 * be made "obsolete" in the next. In this case the entry should also have it's
268 * "obsolete_in" field set.
269 *
270 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
271 * on the command line. A warning is printed to let the user know that option might not
272 * be accepted in the future.
273 *
274 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
275 * table and setting the "obsolete_in" field.
276 *
277 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
278 * to the current JDK version. The system will flatly refuse to admit the existence of
279 * the flag. This allows a flag to die automatically over JDK releases.
280 *
281 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
282 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
283 * - Newly obsolete or expired deprecated options should have their global variable
284 * definitions removed (from globals.hpp, etc) and related implementations removed.
285 *
286 * Recommended approach for removing options:
287 *
288 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
289 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
290 *
291 * To remove internal options (e.g. diagnostic, experimental, develop options), use
292 * a 2-step model adding major release numbers to the obsolete and expire columns.
293 *
294 * To change the name of an option, use the alias table as well as a 2-step
295 * model adding major release numbers to the deprecate and expire columns.
296 * Think twice about aliasing commonly used customer options.
297 *
298 * There are times when it is appropriate to leave a future release number as undefined.
299 *
300 * Tests: Aliases should be tested in VMAliasOptions.java.
301 * Deprecated options should be tested in VMDeprecatedOptions.java.
302 */
303
304 // Obsolete or deprecated -XX flag.
305 typedef struct {
306 const char* name;
307 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
308 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
309 JDK_Version expired_in; // When the option expires (or "undefined").
310 } SpecialFlag;
311
312 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
313 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
314 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
315 // the command-line as usual, but will issue a warning.
316 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
317 // the command-line, while issuing a warning and ignoring the flag value.
318 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
319 // existence of the flag.
320 //
321 // MANUAL CLEANUP ON JDK VERSION UPDATES:
322 // This table ensures that the handling of options will update automatically when the JDK
323 // version is incremented, but the source code needs to be cleanup up manually:
324 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
325 // variable should be removed, as well as users of the variable.
326 // - As "deprecated" options age into "obsolete" options, move the entry into the
327 // "Obsolete Flags" section of the table.
328 // - All expired options should be removed from the table.
329 static SpecialFlag const special_jvm_flags[] = {
330 // -------------- Deprecated Flags --------------
331 // --- Non-alias flags - sorted by obsolete_in then expired_in:
332 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
333 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
334
335 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
336 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
337 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
338 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
339 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
340 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
341 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
342 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
343
344 // -------------- Obsolete Flags - sorted by expired_in --------------
345 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
346 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
347 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
348 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
349 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 #ifndef ZERO
359 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 #endif // ZERO
362 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371
372 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
373 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
374 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
375 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
376 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
377 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
378 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
379 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
380 #endif
381
382 { NULL, JDK_Version(0), JDK_Version(0) }
383 };
384
385 // Flags that are aliases for other flags.
386 typedef struct {
387 const char* alias_name;
388 const char* real_name;
389 } AliasedFlag;
390
391 static AliasedFlag const aliased_jvm_flags[] = {
392 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
393 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
394 { "CMSMarkStackSize", "MarkStackSize" },
395 { "G1MarkStackSize", "MarkStackSize" },
396 { "ParallelMarkingThreads", "ConcGCThreads" },
397 { "ParallelCMSThreads", "ConcGCThreads" },
398 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
399 { NULL, NULL}
400 };
401
402 // Return true if "v" is less than "other", where "other" may be "undefined".
403 static bool version_less_than(JDK_Version v, JDK_Version other) {
404 assert(!v.is_undefined(), "must be defined");
405 if (!other.is_undefined() && v.compare(other) >= 0) {
406 return false;
407 } else {
408 return true;
409 }
410 }
411
412 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
413 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
414 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
415 flag = special_jvm_flags[i];
416 return true;
417 }
418 }
419 return false;
420 }
421
422 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
423 assert(version != NULL, "Must provide a version buffer");
424 SpecialFlag flag;
425 if (lookup_special_flag(flag_name, flag)) {
426 if (!flag.obsolete_in.is_undefined()) {
427 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
428 *version = flag.obsolete_in;
429 return true;
430 }
431 }
432 }
433 return false;
434 }
435
436 int Arguments::is_deprecated_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.deprecated_in.is_undefined()) {
441 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
442 version_less_than(JDK_Version::current(), flag.expired_in)) {
443 *version = flag.deprecated_in;
444 return 1;
445 } else {
446 return -1;
447 }
448 }
449 }
450 return 0;
451 }
452
453 const char* Arguments::real_flag_name(const char *flag_name) {
454 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
455 const AliasedFlag& flag_status = aliased_jvm_flags[i];
456 if (strcmp(flag_status.alias_name, flag_name) == 0) {
457 return flag_status.real_name;
458 }
459 }
460 return flag_name;
461 }
462
463 #ifdef ASSERT
464 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
465 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
466 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
467 return true;
468 }
469 }
470 return false;
471 }
472
473 static bool verify_special_jvm_flags() {
474 bool success = true;
475 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
476 const SpecialFlag& flag = special_jvm_flags[i];
477 if (lookup_special_flag(flag.name, i)) {
478 warning("Duplicate special flag declaration \"%s\"", flag.name);
479 success = false;
480 }
481 if (flag.deprecated_in.is_undefined() &&
482 flag.obsolete_in.is_undefined()) {
483 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
484 success = false;
485 }
486
487 if (!flag.deprecated_in.is_undefined()) {
488 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
489 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
490 success = false;
491 }
492
493 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
494 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
495 success = false;
496 }
497 }
498
499 if (!flag.obsolete_in.is_undefined()) {
500 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
501 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
502 success = false;
503 }
504
505 // if flag has become obsolete it should not have a "globals" flag defined anymore.
506 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
507 if (Flag::find_flag(flag.name) != NULL) {
508 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
509 success = false;
510 }
511 }
512 }
513
514 if (!flag.expired_in.is_undefined()) {
515 // if flag has become expired it should not have a "globals" flag defined anymore.
516 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
517 if (Flag::find_flag(flag.name) != NULL) {
518 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
519 success = false;
520 }
521 }
522 }
523
524 }
525 return success;
526 }
527 #endif
528
529 // Constructs the system class path (aka boot class path) from the following
530 // components, in order:
531 //
532 // prefix // from -Xbootclasspath/p:...
533 // base // from os::get_system_properties() or -Xbootclasspath=
534 // suffix // from -Xbootclasspath/a:...
535 //
536 // This could be AllStatic, but it isn't needed after argument processing is
537 // complete.
538 class SysClassPath: public StackObj {
539 public:
540 SysClassPath(const char* base);
541 ~SysClassPath();
542
543 inline void set_base(const char* base);
544 inline void add_prefix(const char* prefix);
545 inline void add_suffix_to_prefix(const char* suffix);
546 inline void add_suffix(const char* suffix);
547 inline void reset_path(const char* base);
548
549 inline const char* get_base() const { return _items[_scp_base]; }
550 inline const char* get_prefix() const { return _items[_scp_prefix]; }
551 inline const char* get_suffix() const { return _items[_scp_suffix]; }
552
553 // Combine all the components into a single c-heap-allocated string; caller
554 // must free the string if/when no longer needed.
555 char* combined_path();
556
557 private:
558 // Utility routines.
559 static char* add_to_path(const char* path, const char* str, bool prepend);
560 static char* add_jars_to_path(char* path, const char* directory);
561
562 inline void reset_item_at(int index);
563
564 // Array indices for the items that make up the sysclasspath. All except the
565 // base are allocated in the C heap and freed by this class.
566 enum {
567 _scp_prefix, // from -Xbootclasspath/p:...
568 _scp_base, // the default sysclasspath
569 _scp_suffix, // from -Xbootclasspath/a:...
570 _scp_nitems // the number of items, must be last.
571 };
572
573 const char* _items[_scp_nitems];
574 };
575
576 SysClassPath::SysClassPath(const char* base) {
577 memset(_items, 0, sizeof(_items));
578 _items[_scp_base] = base;
579 }
580
581 SysClassPath::~SysClassPath() {
582 // Free everything except the base.
583 for (int i = 0; i < _scp_nitems; ++i) {
584 if (i != _scp_base) reset_item_at(i);
585 }
586 }
587
588 inline void SysClassPath::set_base(const char* base) {
589 _items[_scp_base] = base;
590 }
591
592 inline void SysClassPath::add_prefix(const char* prefix) {
593 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
594 }
595
596 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
597 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
598 }
599
600 inline void SysClassPath::add_suffix(const char* suffix) {
601 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
602 }
603
604 inline void SysClassPath::reset_item_at(int index) {
605 assert(index < _scp_nitems && index != _scp_base, "just checking");
606 if (_items[index] != NULL) {
607 FREE_C_HEAP_ARRAY(char, _items[index]);
608 _items[index] = NULL;
609 }
610 }
611
612 inline void SysClassPath::reset_path(const char* base) {
613 // Clear the prefix and suffix.
614 reset_item_at(_scp_prefix);
615 reset_item_at(_scp_suffix);
616 set_base(base);
617 }
618
619 //------------------------------------------------------------------------------
620
621
622 // Combine the bootclasspath elements, some of which may be null, into a single
623 // c-heap-allocated string.
624 char* SysClassPath::combined_path() {
625 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
626
627 size_t lengths[_scp_nitems];
628 size_t total_len = 0;
629
630 const char separator = *os::path_separator();
631
632 // Get the lengths.
633 int i;
634 for (i = 0; i < _scp_nitems; ++i) {
635 if (_items[i] != NULL) {
636 lengths[i] = strlen(_items[i]);
637 // Include space for the separator char (or a NULL for the last item).
638 total_len += lengths[i] + 1;
639 }
640 }
641 assert(total_len > 0, "empty sysclasspath not allowed");
642
643 // Copy the _items to a single string.
644 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
645 char* cp_tmp = cp;
646 for (i = 0; i < _scp_nitems; ++i) {
647 if (_items[i] != NULL) {
648 memcpy(cp_tmp, _items[i], lengths[i]);
649 cp_tmp += lengths[i];
650 *cp_tmp++ = separator;
651 }
652 }
653 *--cp_tmp = '\0'; // Replace the extra separator.
654 return cp;
655 }
656
657 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
658 char*
659 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
660 char *cp;
661
662 assert(str != NULL, "just checking");
663 if (path == NULL) {
664 size_t len = strlen(str) + 1;
665 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
666 memcpy(cp, str, len); // copy the trailing null
667 } else {
668 const char separator = *os::path_separator();
669 size_t old_len = strlen(path);
670 size_t str_len = strlen(str);
671 size_t len = old_len + str_len + 2;
672
673 if (prepend) {
674 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
675 char* cp_tmp = cp;
676 memcpy(cp_tmp, str, str_len);
677 cp_tmp += str_len;
678 *cp_tmp = separator;
679 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
680 FREE_C_HEAP_ARRAY(char, path);
681 } else {
682 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
683 char* cp_tmp = cp + old_len;
684 *cp_tmp = separator;
685 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
686 }
687 }
688 return cp;
689 }
690
691 // Scan the directory and append any jar or zip files found to path.
692 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
693 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
694 DIR* dir = os::opendir(directory);
695 if (dir == NULL) return path;
696
697 char dir_sep[2] = { '\0', '\0' };
698 size_t directory_len = strlen(directory);
699 const char fileSep = *os::file_separator();
700 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
701
702 /* Scan the directory for jars/zips, appending them to path. */
703 struct dirent *entry;
704 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
705 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
706 const char* name = entry->d_name;
707 const char* ext = name + strlen(name) - 4;
708 bool isJarOrZip = ext > name &&
709 (os::file_name_strcmp(ext, ".jar") == 0 ||
710 os::file_name_strcmp(ext, ".zip") == 0);
711 if (isJarOrZip) {
712 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
713 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
714 path = add_to_path(path, jarpath, false);
715 FREE_C_HEAP_ARRAY(char, jarpath);
716 }
717 }
718 FREE_C_HEAP_ARRAY(char, dbuf);
719 os::closedir(dir);
720 return path;
721 }
722
723 // Parses a memory size specification string.
724 static bool atomull(const char *s, julong* result) {
725 julong n = 0;
726 int args_read = 0;
727 bool is_hex = false;
728 // Skip leading 0[xX] for hexadecimal
729 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
730 s += 2;
731 is_hex = true;
732 args_read = sscanf(s, JULONG_FORMAT_X, &n);
733 } else {
734 args_read = sscanf(s, JULONG_FORMAT, &n);
735 }
736 if (args_read != 1) {
737 return false;
738 }
739 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
740 s++;
741 }
742 // 4705540: illegal if more characters are found after the first non-digit
743 if (strlen(s) > 1) {
744 return false;
745 }
746 switch (*s) {
747 case 'T': case 't':
748 *result = n * G * K;
749 // Check for overflow.
750 if (*result/((julong)G * K) != n) return false;
751 return true;
752 case 'G': case 'g':
753 *result = n * G;
754 if (*result/G != n) return false;
755 return true;
756 case 'M': case 'm':
757 *result = n * M;
758 if (*result/M != n) return false;
759 return true;
760 case 'K': case 'k':
761 *result = n * K;
762 if (*result/K != n) return false;
763 return true;
764 case '\0':
765 *result = n;
766 return true;
767 default:
768 return false;
769 }
770 }
771
772 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
773 if (size < min_size) return arg_too_small;
774 // Check that size will fit in a size_t (only relevant on 32-bit)
775 if (size > max_uintx) return arg_too_big;
776 return arg_in_range;
777 }
778
779 // Describe an argument out of range error
780 void Arguments::describe_range_error(ArgsRange errcode) {
781 switch(errcode) {
782 case arg_too_big:
783 jio_fprintf(defaultStream::error_stream(),
784 "The specified size exceeds the maximum "
785 "representable size.\n");
786 break;
787 case arg_too_small:
788 case arg_unreadable:
789 case arg_in_range:
790 // do nothing for now
791 break;
792 default:
793 ShouldNotReachHere();
794 }
795 }
796
797 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
798 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
799 return true;
800 } else {
801 return false;
802 }
803 }
804
805 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
806 char* end;
807 errno = 0;
808 double v = strtod(value, &end);
809 if ((errno != 0) || (*end != 0)) {
810 return false;
811 }
812
813 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
814 return true;
815 }
816 return false;
817 }
818
819 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
820 julong v;
821 int int_v;
822 intx intx_v;
823 bool is_neg = false;
824 Flag* result = Flag::find_flag(name, strlen(name));
825
826 if (result == NULL) {
827 return false;
828 }
829
830 // Check the sign first since atomull() parses only unsigned values.
831 if (*value == '-') {
832 if (!result->is_intx() && !result->is_int()) {
833 return false;
834 }
835 value++;
836 is_neg = true;
837 }
838 if (!atomull(value, &v)) {
839 return false;
840 }
841 if (result->is_int()) {
842 int_v = (int) v;
843 if (is_neg) {
844 int_v = -int_v;
845 }
846 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
847 } else if (result->is_uint()) {
848 uint uint_v = (uint) v;
849 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
850 } else if (result->is_intx()) {
851 intx_v = (intx) v;
852 if (is_neg) {
853 intx_v = -intx_v;
854 }
855 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
856 } else if (result->is_uintx()) {
857 uintx uintx_v = (uintx) v;
858 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
859 } else if (result->is_uint64_t()) {
860 uint64_t uint64_t_v = (uint64_t) v;
861 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
862 } else if (result->is_size_t()) {
863 size_t size_t_v = (size_t) v;
864 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
865 } else {
866 return false;
867 }
868 }
869
870 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
871 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
872 // Contract: CommandLineFlags always returns a pointer that needs freeing.
873 FREE_C_HEAP_ARRAY(char, value);
874 return true;
875 }
876
877 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
878 const char* old_value = "";
879 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
880 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
881 size_t new_len = strlen(new_value);
882 const char* value;
883 char* free_this_too = NULL;
884 if (old_len == 0) {
885 value = new_value;
886 } else if (new_len == 0) {
887 value = old_value;
888 } else {
889 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
890 // each new setting adds another LINE to the switch:
891 sprintf(buf, "%s\n%s", old_value, new_value);
892 value = buf;
893 free_this_too = buf;
894 }
895 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
896 // CommandLineFlags always returns a pointer that needs freeing.
897 FREE_C_HEAP_ARRAY(char, value);
898 if (free_this_too != NULL) {
899 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
900 FREE_C_HEAP_ARRAY(char, free_this_too);
901 }
902 return true;
903 }
904
905 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
906 const char* real_name = real_flag_name(arg);
907 JDK_Version since = JDK_Version();
908 switch (is_deprecated_flag(arg, &since)) {
909 case -1:
910 return NULL; // obsolete or expired, don't process normally
911 case 0:
912 return real_name;
913 case 1: {
914 if (warn) {
915 char version[256];
916 since.to_string(version, sizeof(version));
917 if (real_name != arg) {
918 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
919 arg, version, real_name);
920 } else {
921 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
922 arg, version);
923 }
924 }
925 return real_name;
926 }
927 }
928 ShouldNotReachHere();
929 return NULL;
930 }
931
932 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
933
934 // range of acceptable characters spelled out for portability reasons
935 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
936 #define BUFLEN 255
937 char name[BUFLEN+1];
938 char dummy;
939 const char* real_name;
940 bool warn_if_deprecated = true;
941
942 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
943 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
944 if (real_name == NULL) {
945 return false;
946 }
947 return set_bool_flag(real_name, false, origin);
948 }
949 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
950 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
951 if (real_name == NULL) {
952 return false;
953 }
954 return set_bool_flag(real_name, true, origin);
955 }
956
957 char punct;
958 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
959 const char* value = strchr(arg, '=') + 1;
960 Flag* flag;
961
962 // this scanf pattern matches both strings (handled here) and numbers (handled later))
963 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
964 if (real_name == NULL) {
965 return false;
966 }
967 flag = Flag::find_flag(real_name);
968 if (flag != NULL && flag->is_ccstr()) {
969 if (flag->ccstr_accumulates()) {
970 return append_to_string_flag(real_name, value, origin);
971 } else {
972 if (value[0] == '\0') {
973 value = NULL;
974 }
975 return set_string_flag(real_name, value, origin);
976 }
977 } else {
978 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
979 }
980 }
981
982 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
983 const char* value = strchr(arg, '=') + 1;
984 // -XX:Foo:=xxx will reset the string flag to the given value.
985 if (value[0] == '\0') {
986 value = NULL;
987 }
988 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
989 if (real_name == NULL) {
990 return false;
991 }
992 return set_string_flag(real_name, value, origin);
993 }
994
995 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
996 #define SIGNED_NUMBER_RANGE "[-0123456789]"
997 #define NUMBER_RANGE "[0123456789eE+-]"
998 char value[BUFLEN + 1];
999 char value2[BUFLEN + 1];
1000 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1001 // Looks like a floating-point number -- try again with more lenient format string
1002 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1003 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1004 if (real_name == NULL) {
1005 return false;
1006 }
1007 return set_fp_numeric_flag(real_name, value, origin);
1008 }
1009 }
1010
1011 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1012 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1013 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1014 if (real_name == NULL) {
1015 return false;
1016 }
1017 return set_numeric_flag(real_name, value, origin);
1018 }
1019
1020 return false;
1021 }
1022
1023 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1024 assert(bldarray != NULL, "illegal argument");
1025
1026 if (arg == NULL) {
1027 return;
1028 }
1029
1030 int new_count = *count + 1;
1031
1032 // expand the array and add arg to the last element
1033 if (*bldarray == NULL) {
1034 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1035 } else {
1036 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1037 }
1038 (*bldarray)[*count] = os::strdup_check_oom(arg);
1039 *count = new_count;
1040 }
1041
1042 void Arguments::build_jvm_args(const char* arg) {
1043 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1044 }
1045
1046 void Arguments::build_jvm_flags(const char* arg) {
1047 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1048 }
1049
1050 // utility function to return a string that concatenates all
1051 // strings in a given char** array
1052 const char* Arguments::build_resource_string(char** args, int count) {
1053 if (args == NULL || count == 0) {
1054 return NULL;
1055 }
1056 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1057 for (int i = 1; i < count; i++) {
1058 length += strlen(args[i]) + 1; // add 1 for a space
1059 }
1060 char* s = NEW_RESOURCE_ARRAY(char, length);
1061 strcpy(s, args[0]);
1062 for (int j = 1; j < count; j++) {
1063 strcat(s, " ");
1064 strcat(s, args[j]);
1065 }
1066 return (const char*) s;
1067 }
1068
1069 void Arguments::print_on(outputStream* st) {
1070 st->print_cr("VM Arguments:");
1071 if (num_jvm_flags() > 0) {
1072 st->print("jvm_flags: "); print_jvm_flags_on(st);
1073 st->cr();
1074 }
1075 if (num_jvm_args() > 0) {
1076 st->print("jvm_args: "); print_jvm_args_on(st);
1077 st->cr();
1078 }
1079 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1080 if (_java_class_path != NULL) {
1081 char* path = _java_class_path->value();
1082 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1083 }
1084 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1085 }
1086
1087 void Arguments::print_summary_on(outputStream* st) {
1088 // Print the command line. Environment variables that are helpful for
1089 // reproducing the problem are written later in the hs_err file.
1090 // flags are from setting file
1091 if (num_jvm_flags() > 0) {
1092 st->print_raw("Settings File: ");
1093 print_jvm_flags_on(st);
1094 st->cr();
1095 }
1096 // args are the command line and environment variable arguments.
1097 st->print_raw("Command Line: ");
1098 if (num_jvm_args() > 0) {
1099 print_jvm_args_on(st);
1100 }
1101 // this is the classfile and any arguments to the java program
1102 if (java_command() != NULL) {
1103 st->print("%s", java_command());
1104 }
1105 st->cr();
1106 }
1107
1108 void Arguments::print_jvm_flags_on(outputStream* st) {
1109 if (_num_jvm_flags > 0) {
1110 for (int i=0; i < _num_jvm_flags; i++) {
1111 st->print("%s ", _jvm_flags_array[i]);
1112 }
1113 }
1114 }
1115
1116 void Arguments::print_jvm_args_on(outputStream* st) {
1117 if (_num_jvm_args > 0) {
1118 for (int i=0; i < _num_jvm_args; i++) {
1119 st->print("%s ", _jvm_args_array[i]);
1120 }
1121 }
1122 }
1123
1124 bool Arguments::process_argument(const char* arg,
1125 jboolean ignore_unrecognized,
1126 Flag::Flags origin) {
1127 JDK_Version since = JDK_Version();
1128
1129 if (parse_argument(arg, origin)) {
1130 return true;
1131 }
1132
1133 // Determine if the flag has '+', '-', or '=' characters.
1134 bool has_plus_minus = (*arg == '+' || *arg == '-');
1135 const char* const argname = has_plus_minus ? arg + 1 : arg;
1136
1137 size_t arg_len;
1138 const char* equal_sign = strchr(argname, '=');
1139 if (equal_sign == NULL) {
1140 arg_len = strlen(argname);
1141 } else {
1142 arg_len = equal_sign - argname;
1143 }
1144
1145 // Only make the obsolete check for valid arguments.
1146 if (arg_len <= BUFLEN) {
1147 // Construct a string which consists only of the argument name without '+', '-', or '='.
1148 char stripped_argname[BUFLEN+1];
1149 strncpy(stripped_argname, argname, arg_len);
1150 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1151
1152 if (is_obsolete_flag(stripped_argname, &since)) {
1153 char version[256];
1154 since.to_string(version, sizeof(version));
1155 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1156 return true;
1157 }
1158 }
1159
1160 // For locked flags, report a custom error message if available.
1161 // Otherwise, report the standard unrecognized VM option.
1162 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1163 if (found_flag != NULL) {
1164 char locked_message_buf[BUFLEN];
1165 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1166 if (strlen(locked_message_buf) == 0) {
1167 if (found_flag->is_bool() && !has_plus_minus) {
1168 jio_fprintf(defaultStream::error_stream(),
1169 "Missing +/- setting for VM option '%s'\n", argname);
1170 } else if (!found_flag->is_bool() && has_plus_minus) {
1171 jio_fprintf(defaultStream::error_stream(),
1172 "Unexpected +/- setting in VM option '%s'\n", argname);
1173 } else {
1174 jio_fprintf(defaultStream::error_stream(),
1175 "Improperly specified VM option '%s'\n", argname);
1176 }
1177 } else {
1178 #ifdef PRODUCT
1179 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1180 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1181 if (ignore_unrecognized && mismatched) {
1182 return true;
1183 }
1184 #endif
1185 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1186 }
1187 } else {
1188 if (ignore_unrecognized) {
1189 return true;
1190 }
1191 jio_fprintf(defaultStream::error_stream(),
1192 "Unrecognized VM option '%s'\n", argname);
1193 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1194 if (fuzzy_matched != NULL) {
1195 jio_fprintf(defaultStream::error_stream(),
1196 "Did you mean '%s%s%s'? ",
1197 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1198 fuzzy_matched->_name,
1199 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1200 }
1201 }
1202
1203 // allow for commandline "commenting out" options like -XX:#+Verbose
1204 return arg[0] == '#';
1205 }
1206
1207 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1208 FILE* stream = fopen(file_name, "rb");
1209 if (stream == NULL) {
1210 if (should_exist) {
1211 jio_fprintf(defaultStream::error_stream(),
1212 "Could not open settings file %s\n", file_name);
1213 return false;
1214 } else {
1215 return true;
1216 }
1217 }
1218
1219 char token[1024];
1220 int pos = 0;
1221
1222 bool in_white_space = true;
1223 bool in_comment = false;
1224 bool in_quote = false;
1225 char quote_c = 0;
1226 bool result = true;
1227
1228 int c = getc(stream);
1229 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1230 if (in_white_space) {
1231 if (in_comment) {
1232 if (c == '\n') in_comment = false;
1233 } else {
1234 if (c == '#') in_comment = true;
1235 else if (!isspace(c)) {
1236 in_white_space = false;
1237 token[pos++] = c;
1238 }
1239 }
1240 } else {
1241 if (c == '\n' || (!in_quote && isspace(c))) {
1242 // token ends at newline, or at unquoted whitespace
1243 // this allows a way to include spaces in string-valued options
1244 token[pos] = '\0';
1245 logOption(token);
1246 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1247 build_jvm_flags(token);
1248 pos = 0;
1249 in_white_space = true;
1250 in_quote = false;
1251 } else if (!in_quote && (c == '\'' || c == '"')) {
1252 in_quote = true;
1253 quote_c = c;
1254 } else if (in_quote && (c == quote_c)) {
1255 in_quote = false;
1256 } else {
1257 token[pos++] = c;
1258 }
1259 }
1260 c = getc(stream);
1261 }
1262 if (pos > 0) {
1263 token[pos] = '\0';
1264 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1265 build_jvm_flags(token);
1266 }
1267 fclose(stream);
1268 return result;
1269 }
1270
1271 //=============================================================================================================
1272 // Parsing of properties (-D)
1273
1274 const char* Arguments::get_property(const char* key) {
1275 return PropertyList_get_value(system_properties(), key);
1276 }
1277
1278 bool Arguments::add_property(const char* prop) {
1279 const char* eq = strchr(prop, '=');
1280 const char* key;
1281 const char* value = "";
1282
1283 if (eq == NULL) {
1284 // property doesn't have a value, thus use passed string
1285 key = prop;
1286 } else {
1287 // property have a value, thus extract it and save to the
1288 // allocated string
1289 size_t key_len = eq - prop;
1290 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1291
1292 strncpy(tmp_key, prop, key_len);
1293 tmp_key[key_len] = '\0';
1294 key = tmp_key;
1295
1296 value = &prop[key_len + 1];
1297 }
1298
1299 if (strcmp(key, "java.compiler") == 0) {
1300 process_java_compiler_argument(value);
1301 // Record value in Arguments, but let it get passed to Java.
1302 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1303 strcmp(key, "sun.java.launcher.pid") == 0) {
1304 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1305 // private and are processed in process_sun_java_launcher_properties();
1306 // the sun.java.launcher property is passed on to the java application
1307 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1308 PropertyList_unique_add(&_system_properties, key, value, true);
1309 } else {
1310 if (strcmp(key, "sun.java.command") == 0) {
1311 char *old_java_command = _java_command;
1312 _java_command = os::strdup_check_oom(value, mtInternal);
1313 if (old_java_command != NULL) {
1314 os::free(old_java_command);
1315 }
1316 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1317 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1318 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1319 // its value without going through the property list or making a Java call.
1320 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1321 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1322 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1323 os::free((void *)old_java_vendor_url_bug);
1324 }
1325 }
1326
1327 // Create new property and add at the end of the list
1328 PropertyList_unique_add(&_system_properties, key, value);
1329 }
1330
1331 if (key != prop) {
1332 // SystemProperty copy passed value, thus free previously allocated
1333 // memory
1334 FreeHeap((void *)key);
1335 }
1336
1337 return true;
1338 }
1339
1340 //===========================================================================================================
1341 // Setting int/mixed/comp mode flags
1342
1343 void Arguments::set_mode_flags(Mode mode) {
1344 // Set up default values for all flags.
1345 // If you add a flag to any of the branches below,
1346 // add a default value for it here.
1347 set_java_compiler(false);
1348 _mode = mode;
1349
1350 // Ensure Agent_OnLoad has the correct initial values.
1351 // This may not be the final mode; mode may change later in onload phase.
1352 PropertyList_unique_add(&_system_properties, "java.vm.info",
1353 VM_Version::vm_info_string(), false);
1354
1355 UseInterpreter = true;
1356 UseCompiler = true;
1357 UseLoopCounter = true;
1358
1359 // Default values may be platform/compiler dependent -
1360 // use the saved values
1361 ClipInlining = Arguments::_ClipInlining;
1362 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1363 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1364 BackgroundCompilation = Arguments::_BackgroundCompilation;
1365 if (TieredCompilation) {
1366 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1367 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1368 }
1369 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1370 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1371 }
1372 }
1373
1374 // Change from defaults based on mode
1375 switch (mode) {
1376 default:
1377 ShouldNotReachHere();
1378 break;
1379 case _int:
1380 UseCompiler = false;
1381 UseLoopCounter = false;
1382 AlwaysCompileLoopMethods = false;
1383 UseOnStackReplacement = false;
1384 break;
1385 case _mixed:
1386 // same as default
1387 break;
1388 case _comp:
1389 UseInterpreter = false;
1390 BackgroundCompilation = false;
1391 ClipInlining = false;
1392 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1393 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1394 // compile a level 4 (C2) and then continue executing it.
1395 if (TieredCompilation) {
1396 Tier3InvokeNotifyFreqLog = 0;
1397 Tier4InvocationThreshold = 0;
1398 }
1399 break;
1400 }
1401 }
1402
1403 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1404 // Conflict: required to use shared spaces (-Xshare:on), but
1405 // incompatible command line options were chosen.
1406
1407 static void no_shared_spaces(const char* message) {
1408 if (RequireSharedSpaces) {
1409 jio_fprintf(defaultStream::error_stream(),
1410 "Class data sharing is inconsistent with other specified options.\n");
1411 vm_exit_during_initialization("Unable to use shared archive.", message);
1412 } else {
1413 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1414 }
1415 }
1416 #endif
1417
1418 // Returns threshold scaled with the value of scale.
1419 // If scale < 0.0, threshold is returned without scaling.
1420 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1421 if (scale == 1.0 || scale < 0.0) {
1422 return threshold;
1423 } else {
1424 return (intx)(threshold * scale);
1425 }
1426 }
1427
1428 // Returns freq_log scaled with the value of scale.
1429 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1430 // If scale < 0.0, freq_log is returned without scaling.
1431 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1432 // Check if scaling is necessary or if negative value was specified.
1433 if (scale == 1.0 || scale < 0.0) {
1434 return freq_log;
1435 }
1436 // Check values to avoid calculating log2 of 0.
1437 if (scale == 0.0 || freq_log == 0) {
1438 return 0;
1439 }
1440 // Determine the maximum notification frequency value currently supported.
1441 // The largest mask value that the interpreter/C1 can handle is
1442 // of length InvocationCounter::number_of_count_bits. Mask values are always
1443 // one bit shorter then the value of the notification frequency. Set
1444 // max_freq_bits accordingly.
1445 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1446 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1447 if (scaled_freq == 0) {
1448 // Return 0 right away to avoid calculating log2 of 0.
1449 return 0;
1450 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1451 return max_freq_bits;
1452 } else {
1453 return log2_intptr(scaled_freq);
1454 }
1455 }
1456
1457 void Arguments::set_tiered_flags() {
1458 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1459 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1460 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1461 }
1462 if (CompilationPolicyChoice < 2) {
1463 vm_exit_during_initialization(
1464 "Incompatible compilation policy selected", NULL);
1465 }
1466 // Increase the code cache size - tiered compiles a lot more.
1467 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1468 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1469 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1470 }
1471 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1472 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1473 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1474 }
1475 if (!UseInterpreter) { // -Xcomp
1476 Tier3InvokeNotifyFreqLog = 0;
1477 Tier4InvocationThreshold = 0;
1478 }
1479
1480 if (CompileThresholdScaling < 0) {
1481 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1482 }
1483
1484 // Scale tiered compilation thresholds.
1485 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1486 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1487 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1488 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1489
1490 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1491 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1492 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1493 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1494
1495 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1496 // once these thresholds become supported.
1497
1498 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1499 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1500
1501 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1502 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1503
1504 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1505
1506 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1507 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1508 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1509 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1510 }
1511 }
1512
1513 #if INCLUDE_ALL_GCS
1514 static void disable_adaptive_size_policy(const char* collector_name) {
1515 if (UseAdaptiveSizePolicy) {
1516 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1517 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1518 collector_name);
1519 }
1520 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1521 }
1522 }
1523
1524 void Arguments::set_parnew_gc_flags() {
1525 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1526 "control point invariant");
1527 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1528 assert(UseParNewGC, "ParNew should always be used with CMS");
1529
1530 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1531 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1532 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1533 } else if (ParallelGCThreads == 0) {
1534 jio_fprintf(defaultStream::error_stream(),
1535 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1536 vm_exit(1);
1537 }
1538
1539 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1540 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1541 // we set them to 1024 and 1024.
1542 // See CR 6362902.
1543 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1544 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1545 }
1546 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1547 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1548 }
1549
1550 // When using compressed oops, we use local overflow stacks,
1551 // rather than using a global overflow list chained through
1552 // the klass word of the object's pre-image.
1553 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1554 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1555 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1556 }
1557 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1558 }
1559 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1560 }
1561
1562 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1563 // sparc/solaris for certain applications, but would gain from
1564 // further optimization and tuning efforts, and would almost
1565 // certainly gain from analysis of platform and environment.
1566 void Arguments::set_cms_and_parnew_gc_flags() {
1567 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1568 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1569 assert(UseParNewGC, "ParNew should always be used with CMS");
1570
1571 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1572 disable_adaptive_size_policy("UseConcMarkSweepGC");
1573
1574 set_parnew_gc_flags();
1575
1576 size_t max_heap = align_size_down(MaxHeapSize,
1577 CardTableRS::ct_max_alignment_constraint());
1578
1579 // Now make adjustments for CMS
1580 intx tenuring_default = (intx)6;
1581 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1582
1583 // Preferred young gen size for "short" pauses:
1584 // upper bound depends on # of threads and NewRatio.
1585 const size_t preferred_max_new_size_unaligned =
1586 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1587 size_t preferred_max_new_size =
1588 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1589
1590 // Unless explicitly requested otherwise, size young gen
1591 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1592
1593 // If either MaxNewSize or NewRatio is set on the command line,
1594 // assume the user is trying to set the size of the young gen.
1595 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1596
1597 // Set MaxNewSize to our calculated preferred_max_new_size unless
1598 // NewSize was set on the command line and it is larger than
1599 // preferred_max_new_size.
1600 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1601 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1602 } else {
1603 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1604 }
1605 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1606
1607 // Code along this path potentially sets NewSize and OldSize
1608 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1609 min_heap_size(), InitialHeapSize, max_heap);
1610 size_t min_new = preferred_max_new_size;
1611 if (FLAG_IS_CMDLINE(NewSize)) {
1612 min_new = NewSize;
1613 }
1614 if (max_heap > min_new && min_heap_size() > min_new) {
1615 // Unless explicitly requested otherwise, make young gen
1616 // at least min_new, and at most preferred_max_new_size.
1617 if (FLAG_IS_DEFAULT(NewSize)) {
1618 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1619 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1620 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1621 }
1622 // Unless explicitly requested otherwise, size old gen
1623 // so it's NewRatio x of NewSize.
1624 if (FLAG_IS_DEFAULT(OldSize)) {
1625 if (max_heap > NewSize) {
1626 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1627 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1628 }
1629 }
1630 }
1631 }
1632 // Unless explicitly requested otherwise, definitely
1633 // promote all objects surviving "tenuring_default" scavenges.
1634 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1635 FLAG_IS_DEFAULT(SurvivorRatio)) {
1636 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1637 }
1638 // If we decided above (or user explicitly requested)
1639 // `promote all' (via MaxTenuringThreshold := 0),
1640 // prefer minuscule survivor spaces so as not to waste
1641 // space for (non-existent) survivors
1642 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1643 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1644 }
1645
1646 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1647 // but rather the number of free blocks of a given size that are used when
1648 // replenishing the local per-worker free list caches.
1649 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1650 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1651 // OldPLAB sizing manually turned off: Use a larger default setting,
1652 // unless it was manually specified. This is because a too-low value
1653 // will slow down scavenges.
1654 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1655 } else {
1656 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1657 }
1658 }
1659
1660 // If either of the static initialization defaults have changed, note this
1661 // modification.
1662 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1663 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1664 }
1665
1666 if (!ClassUnloading) {
1667 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1668 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1669 }
1670
1671 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1672 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1673 }
1674 #endif // INCLUDE_ALL_GCS
1675
1676 void set_object_alignment() {
1677 // Object alignment.
1678 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1679 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1680 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1681 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1682 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1683 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1684
1685 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1686 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1687
1688 // Oop encoding heap max
1689 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1690
1691 if (SurvivorAlignmentInBytes == 0) {
1692 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1693 }
1694
1695 #if INCLUDE_ALL_GCS
1696 // Set CMS global values
1697 CompactibleFreeListSpace::set_cms_values();
1698 #endif // INCLUDE_ALL_GCS
1699 }
1700
1701 size_t Arguments::max_heap_for_compressed_oops() {
1702 // Avoid sign flip.
1703 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1704 // We need to fit both the NULL page and the heap into the memory budget, while
1705 // keeping alignment constraints of the heap. To guarantee the latter, as the
1706 // NULL page is located before the heap, we pad the NULL page to the conservative
1707 // maximum alignment that the GC may ever impose upon the heap.
1708 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1709 _conservative_max_heap_alignment);
1710
1711 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1712 NOT_LP64(ShouldNotReachHere(); return 0);
1713 }
1714
1715 bool Arguments::should_auto_select_low_pause_collector() {
1716 if (UseAutoGCSelectPolicy &&
1717 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1718 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1719 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1720 return true;
1721 }
1722 return false;
1723 }
1724
1725 void Arguments::set_use_compressed_oops() {
1726 #ifndef ZERO
1727 #ifdef _LP64
1728 // MaxHeapSize is not set up properly at this point, but
1729 // the only value that can override MaxHeapSize if we are
1730 // to use UseCompressedOops is InitialHeapSize.
1731 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1732
1733 if (max_heap_size <= max_heap_for_compressed_oops()) {
1734 #if !defined(COMPILER1) || defined(TIERED)
1735 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1736 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1737 }
1738 #endif
1739 } else {
1740 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1741 warning("Max heap size too large for Compressed Oops");
1742 FLAG_SET_DEFAULT(UseCompressedOops, false);
1743 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1744 }
1745 }
1746 #endif // _LP64
1747 #endif // ZERO
1748 }
1749
1750
1751 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1752 // set_use_compressed_oops().
1753 void Arguments::set_use_compressed_klass_ptrs() {
1754 #ifndef ZERO
1755 #ifdef _LP64
1756 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1757 if (!UseCompressedOops) {
1758 if (UseCompressedClassPointers) {
1759 warning("UseCompressedClassPointers requires UseCompressedOops");
1760 }
1761 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1762 } else {
1763 // Turn on UseCompressedClassPointers too
1764 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1765 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1766 }
1767 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1768 if (UseCompressedClassPointers) {
1769 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1770 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1771 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1772 }
1773 }
1774 }
1775 #endif // _LP64
1776 #endif // !ZERO
1777 }
1778
1779 void Arguments::set_conservative_max_heap_alignment() {
1780 // The conservative maximum required alignment for the heap is the maximum of
1781 // the alignments imposed by several sources: any requirements from the heap
1782 // itself, the collector policy and the maximum page size we may run the VM
1783 // with.
1784 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1785 #if INCLUDE_ALL_GCS
1786 if (UseParallelGC) {
1787 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1788 } else if (UseG1GC) {
1789 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1790 }
1791 #endif // INCLUDE_ALL_GCS
1792 _conservative_max_heap_alignment = MAX4(heap_alignment,
1793 (size_t)os::vm_allocation_granularity(),
1794 os::max_page_size(),
1795 CollectorPolicy::compute_heap_alignment());
1796 }
1797
1798 void Arguments::select_gc_ergonomically() {
1799 if (os::is_server_class_machine()) {
1800 if (should_auto_select_low_pause_collector()) {
1801 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1802 } else {
1803 #if defined(JAVASE_EMBEDDED)
1804 FLAG_SET_ERGO(bool, UseParallelGC, true);
1805 #else
1806 FLAG_SET_ERGO(bool, UseG1GC, true);
1807 #endif
1808 }
1809 } else {
1810 FLAG_SET_ERGO(bool, UseSerialGC, true);
1811 }
1812 }
1813
1814 void Arguments::select_gc() {
1815 if (!gc_selected()) {
1816 select_gc_ergonomically();
1817 guarantee(gc_selected(), "No GC selected");
1818 }
1819 }
1820
1821 void Arguments::set_ergonomics_flags() {
1822 select_gc();
1823
1824 #if defined(COMPILER2) || INCLUDE_JVMCI
1825 // Shared spaces work fine with other GCs but causes bytecode rewriting
1826 // to be disabled, which hurts interpreter performance and decreases
1827 // server performance. When -server is specified, keep the default off
1828 // unless it is asked for. Future work: either add bytecode rewriting
1829 // at link time, or rewrite bytecodes in non-shared methods.
1830 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1831 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1832 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1833 }
1834 #endif
1835
1836 set_conservative_max_heap_alignment();
1837
1838 #ifndef ZERO
1839 #ifdef _LP64
1840 set_use_compressed_oops();
1841
1842 // set_use_compressed_klass_ptrs() must be called after calling
1843 // set_use_compressed_oops().
1844 set_use_compressed_klass_ptrs();
1845
1846 // Also checks that certain machines are slower with compressed oops
1847 // in vm_version initialization code.
1848 #endif // _LP64
1849 #endif // !ZERO
1850
1851 CodeCacheExtensions::set_ergonomics_flags();
1852 }
1853
1854 void Arguments::set_parallel_gc_flags() {
1855 assert(UseParallelGC || UseParallelOldGC, "Error");
1856 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1857 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1858 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1859 }
1860 FLAG_SET_DEFAULT(UseParallelGC, true);
1861
1862 // If no heap maximum was requested explicitly, use some reasonable fraction
1863 // of the physical memory, up to a maximum of 1GB.
1864 FLAG_SET_DEFAULT(ParallelGCThreads,
1865 Abstract_VM_Version::parallel_worker_threads());
1866 if (ParallelGCThreads == 0) {
1867 jio_fprintf(defaultStream::error_stream(),
1868 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1869 vm_exit(1);
1870 }
1871
1872 if (UseAdaptiveSizePolicy) {
1873 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1874 // unless the user actually sets these flags.
1875 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1876 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1877 }
1878 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1879 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1880 }
1881 }
1882
1883 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1884 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1885 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1886 // See CR 6362902 for details.
1887 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1888 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1889 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1890 }
1891 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1892 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1893 }
1894 }
1895
1896 if (UseParallelOldGC) {
1897 // Par compact uses lower default values since they are treated as
1898 // minimums. These are different defaults because of the different
1899 // interpretation and are not ergonomically set.
1900 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1901 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1902 }
1903 }
1904 }
1905
1906 void Arguments::set_g1_gc_flags() {
1907 assert(UseG1GC, "Error");
1908 #if defined(COMPILER1) || INCLUDE_JVMCI
1909 FastTLABRefill = false;
1910 #endif
1911 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1912 if (ParallelGCThreads == 0) {
1913 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1914 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1915 }
1916
1917 #if INCLUDE_ALL_GCS
1918 if (G1ConcRefinementThreads == 0) {
1919 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1920 }
1921 #endif
1922
1923 // MarkStackSize will be set (if it hasn't been set by the user)
1924 // when concurrent marking is initialized.
1925 // Its value will be based upon the number of parallel marking threads.
1926 // But we do set the maximum mark stack size here.
1927 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1928 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1929 }
1930
1931 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1932 // In G1, we want the default GC overhead goal to be higher than
1933 // it is for PS, or the heap might be expanded too aggressively.
1934 // We set it here to ~8%.
1935 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1936 }
1937
1938 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1939 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1940 }
1941
1942 #if !INCLUDE_ALL_GCS
1943 #ifdef ASSERT
1944 static bool verify_serial_gc_flags() {
1945 return (UseSerialGC &&
1946 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1947 UseParallelGC || UseParallelOldGC));
1948 }
1949 #endif // ASSERT
1950 #endif // INCLUDE_ALL_GCS
1951
1952 void Arguments::set_gc_specific_flags() {
1953 #if INCLUDE_ALL_GCS
1954 // Set per-collector flags
1955 if (UseParallelGC || UseParallelOldGC) {
1956 set_parallel_gc_flags();
1957 } else if (UseConcMarkSweepGC) {
1958 set_cms_and_parnew_gc_flags();
1959 } else if (UseG1GC) {
1960 set_g1_gc_flags();
1961 }
1962 if (AssumeMP && !UseSerialGC) {
1963 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1964 warning("If the number of processors is expected to increase from one, then"
1965 " you should configure the number of parallel GC threads appropriately"
1966 " using -XX:ParallelGCThreads=N");
1967 }
1968 }
1969 if (MinHeapFreeRatio == 100) {
1970 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1971 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1972 }
1973 #else // INCLUDE_ALL_GCS
1974 assert(verify_serial_gc_flags(), "SerialGC unset");
1975 #endif // INCLUDE_ALL_GCS
1976 }
1977
1978 julong Arguments::limit_by_allocatable_memory(julong limit) {
1979 julong max_allocatable;
1980 julong result = limit;
1981 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1982 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1983 }
1984 return result;
1985 }
1986
1987 // Use static initialization to get the default before parsing
1988 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1989
1990 void Arguments::set_heap_size() {
1991 const julong phys_mem =
1992 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1993 : (julong)MaxRAM;
1994
1995 // If the maximum heap size has not been set with -Xmx,
1996 // then set it as fraction of the size of physical memory,
1997 // respecting the maximum and minimum sizes of the heap.
1998 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1999 julong reasonable_max = phys_mem / MaxRAMFraction;
2000
2001 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2002 // Small physical memory, so use a minimum fraction of it for the heap
2003 reasonable_max = phys_mem / MinRAMFraction;
2004 } else {
2005 // Not-small physical memory, so require a heap at least
2006 // as large as MaxHeapSize
2007 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2008 }
2009 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2010 // Limit the heap size to ErgoHeapSizeLimit
2011 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2012 }
2013 if (UseCompressedOops) {
2014 // Limit the heap size to the maximum possible when using compressed oops
2015 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2016
2017 // HeapBaseMinAddress can be greater than default but not less than.
2018 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2019 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2020 // matches compressed oops printing flags
2021 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2022 jio_fprintf(defaultStream::error_stream(),
2023 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2024 " (" SIZE_FORMAT "G) which is greater than value given "
2025 SIZE_FORMAT "\n",
2026 DefaultHeapBaseMinAddress,
2027 DefaultHeapBaseMinAddress/G,
2028 HeapBaseMinAddress);
2029 }
2030 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2031 }
2032 }
2033
2034 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2035 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2036 // but it should be not less than default MaxHeapSize.
2037 max_coop_heap -= HeapBaseMinAddress;
2038 }
2039 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2040 }
2041 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2042
2043 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2044 // An initial heap size was specified on the command line,
2045 // so be sure that the maximum size is consistent. Done
2046 // after call to limit_by_allocatable_memory because that
2047 // method might reduce the allocation size.
2048 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2049 }
2050
2051 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2052 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2053 }
2054
2055 // If the minimum or initial heap_size have not been set or requested to be set
2056 // ergonomically, set them accordingly.
2057 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2058 julong reasonable_minimum = (julong)(OldSize + NewSize);
2059
2060 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2061
2062 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2063
2064 if (InitialHeapSize == 0) {
2065 julong reasonable_initial = phys_mem / InitialRAMFraction;
2066
2067 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2068 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2069
2070 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2071
2072 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2073 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2074 }
2075 // If the minimum heap size has not been set (via -Xms),
2076 // synchronize with InitialHeapSize to avoid errors with the default value.
2077 if (min_heap_size() == 0) {
2078 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2079 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2080 }
2081 }
2082 }
2083
2084 // This option inspects the machine and attempts to set various
2085 // parameters to be optimal for long-running, memory allocation
2086 // intensive jobs. It is intended for machines with large
2087 // amounts of cpu and memory.
2088 jint Arguments::set_aggressive_heap_flags() {
2089 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2090 // VM, but we may not be able to represent the total physical memory
2091 // available (like having 8gb of memory on a box but using a 32bit VM).
2092 // Thus, we need to make sure we're using a julong for intermediate
2093 // calculations.
2094 julong initHeapSize;
2095 julong total_memory = os::physical_memory();
2096
2097 if (total_memory < (julong) 256 * M) {
2098 jio_fprintf(defaultStream::error_stream(),
2099 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2100 vm_exit(1);
2101 }
2102
2103 // The heap size is half of available memory, or (at most)
2104 // all of possible memory less 160mb (leaving room for the OS
2105 // when using ISM). This is the maximum; because adaptive sizing
2106 // is turned on below, the actual space used may be smaller.
2107
2108 initHeapSize = MIN2(total_memory / (julong) 2,
2109 total_memory - (julong) 160 * M);
2110
2111 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2112
2113 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2114 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2115 return JNI_EINVAL;
2116 }
2117 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2118 return JNI_EINVAL;
2119 }
2120 // Currently the minimum size and the initial heap sizes are the same.
2121 set_min_heap_size(initHeapSize);
2122 }
2123 if (FLAG_IS_DEFAULT(NewSize)) {
2124 // Make the young generation 3/8ths of the total heap.
2125 if (FLAG_SET_CMDLINE(size_t, NewSize,
2126 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2127 return JNI_EINVAL;
2128 }
2129 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2130 return JNI_EINVAL;
2131 }
2132 }
2133
2134 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2135 FLAG_SET_DEFAULT(UseLargePages, true);
2136 #endif
2137
2138 // Increase some data structure sizes for efficiency
2139 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2140 return JNI_EINVAL;
2141 }
2142 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2143 return JNI_EINVAL;
2144 }
2145 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2146 return JNI_EINVAL;
2147 }
2148
2149 // See the OldPLABSize comment below, but replace 'after promotion'
2150 // with 'after copying'. YoungPLABSize is the size of the survivor
2151 // space per-gc-thread buffers. The default is 4kw.
2152 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2153 return JNI_EINVAL;
2154 }
2155
2156 // OldPLABSize is the size of the buffers in the old gen that
2157 // UseParallelGC uses to promote live data that doesn't fit in the
2158 // survivor spaces. At any given time, there's one for each gc thread.
2159 // The default size is 1kw. These buffers are rarely used, since the
2160 // survivor spaces are usually big enough. For specjbb, however, there
2161 // are occasions when there's lots of live data in the young gen
2162 // and we end up promoting some of it. We don't have a definite
2163 // explanation for why bumping OldPLABSize helps, but the theory
2164 // is that a bigger PLAB results in retaining something like the
2165 // original allocation order after promotion, which improves mutator
2166 // locality. A minor effect may be that larger PLABs reduce the
2167 // number of PLAB allocation events during gc. The value of 8kw
2168 // was arrived at by experimenting with specjbb.
2169 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2170 return JNI_EINVAL;
2171 }
2172
2173 // Enable parallel GC and adaptive generation sizing
2174 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2175 return JNI_EINVAL;
2176 }
2177 FLAG_SET_DEFAULT(ParallelGCThreads,
2178 Abstract_VM_Version::parallel_worker_threads());
2179
2180 // Encourage steady state memory management
2181 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2182 return JNI_EINVAL;
2183 }
2184
2185 // This appears to improve mutator locality
2186 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2187 return JNI_EINVAL;
2188 }
2189
2190 // Get around early Solaris scheduling bug
2191 // (affinity vs other jobs on system)
2192 // but disallow DR and offlining (5008695).
2193 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2194 return JNI_EINVAL;
2195 }
2196
2197 return JNI_OK;
2198 }
2199
2200 // This must be called after ergonomics.
2201 void Arguments::set_bytecode_flags() {
2202 if (!RewriteBytecodes) {
2203 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2204 }
2205 }
2206
2207 // Aggressive optimization flags -XX:+AggressiveOpts
2208 jint Arguments::set_aggressive_opts_flags() {
2209 #ifdef COMPILER2
2210 if (AggressiveUnboxing) {
2211 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2212 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2213 } else if (!EliminateAutoBox) {
2214 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2215 AggressiveUnboxing = false;
2216 }
2217 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2218 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2219 } else if (!DoEscapeAnalysis) {
2220 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2221 AggressiveUnboxing = false;
2222 }
2223 }
2224 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2225 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2226 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2227 }
2228 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2229 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2230 }
2231
2232 // Feed the cache size setting into the JDK
2233 char buffer[1024];
2234 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2235 if (!add_property(buffer)) {
2236 return JNI_ENOMEM;
2237 }
2238 }
2239 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2240 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2241 }
2242 #endif
2243
2244 if (AggressiveOpts) {
2245 // Sample flag setting code
2246 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2247 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2248 // }
2249 }
2250
2251 return JNI_OK;
2252 }
2253
2254 //===========================================================================================================
2255 // Parsing of java.compiler property
2256
2257 void Arguments::process_java_compiler_argument(const char* arg) {
2258 // For backwards compatibility, Djava.compiler=NONE or ""
2259 // causes us to switch to -Xint mode UNLESS -Xdebug
2260 // is also specified.
2261 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2262 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2263 }
2264 }
2265
2266 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2267 _sun_java_launcher = os::strdup_check_oom(launcher);
2268 }
2269
2270 bool Arguments::created_by_java_launcher() {
2271 assert(_sun_java_launcher != NULL, "property must have value");
2272 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2273 }
2274
2275 bool Arguments::sun_java_launcher_is_altjvm() {
2276 return _sun_java_launcher_is_altjvm;
2277 }
2278
2279 //===========================================================================================================
2280 // Parsing of main arguments
2281
2282 // Check consistency of GC selection
2283 bool Arguments::check_gc_consistency() {
2284 // Ensure that the user has not selected conflicting sets
2285 // of collectors.
2286 uint i = 0;
2287 if (UseSerialGC) i++;
2288 if (UseConcMarkSweepGC) i++;
2289 if (UseParallelGC || UseParallelOldGC) i++;
2290 if (UseG1GC) i++;
2291 if (i > 1) {
2292 jio_fprintf(defaultStream::error_stream(),
2293 "Conflicting collector combinations in option list; "
2294 "please refer to the release notes for the combinations "
2295 "allowed\n");
2296 return false;
2297 }
2298
2299 if (UseConcMarkSweepGC && !UseParNewGC) {
2300 jio_fprintf(defaultStream::error_stream(),
2301 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2302 return false;
2303 }
2304
2305 if (UseParNewGC && !UseConcMarkSweepGC) {
2306 jio_fprintf(defaultStream::error_stream(),
2307 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2308 return false;
2309 }
2310
2311 return true;
2312 }
2313
2314 // Check the consistency of vm_init_args
2315 bool Arguments::check_vm_args_consistency() {
2316 // Method for adding checks for flag consistency.
2317 // The intent is to warn the user of all possible conflicts,
2318 // before returning an error.
2319 // Note: Needs platform-dependent factoring.
2320 bool status = true;
2321
2322 if (TLABRefillWasteFraction == 0) {
2323 jio_fprintf(defaultStream::error_stream(),
2324 "TLABRefillWasteFraction should be a denominator, "
2325 "not " SIZE_FORMAT "\n",
2326 TLABRefillWasteFraction);
2327 status = false;
2328 }
2329
2330 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2331 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2332 }
2333
2334 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2335 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2336 }
2337
2338 if (GCTimeLimit == 100) {
2339 // Turn off gc-overhead-limit-exceeded checks
2340 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2341 }
2342
2343 status = status && check_gc_consistency();
2344
2345 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2346 // insists that we hold the requisite locks so that the iteration is
2347 // MT-safe. For the verification at start-up and shut-down, we don't
2348 // yet have a good way of acquiring and releasing these locks,
2349 // which are not visible at the CollectedHeap level. We want to
2350 // be able to acquire these locks and then do the iteration rather
2351 // than just disable the lock verification. This will be fixed under
2352 // bug 4788986.
2353 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2354 if (VerifyDuringStartup) {
2355 warning("Heap verification at start-up disabled "
2356 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2357 VerifyDuringStartup = false; // Disable verification at start-up
2358 }
2359
2360 if (VerifyBeforeExit) {
2361 warning("Heap verification at shutdown disabled "
2362 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2363 VerifyBeforeExit = false; // Disable verification at shutdown
2364 }
2365 }
2366
2367 if (PrintNMTStatistics) {
2368 #if INCLUDE_NMT
2369 if (MemTracker::tracking_level() == NMT_off) {
2370 #endif // INCLUDE_NMT
2371 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2372 PrintNMTStatistics = false;
2373 #if INCLUDE_NMT
2374 }
2375 #endif
2376 }
2377 #if INCLUDE_JVMCI
2378 if (EnableJVMCI) {
2379 if (!ScavengeRootsInCode) {
2380 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2381 ScavengeRootsInCode = 1;
2382 }
2383 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2384 TypeProfileLevel = 0;
2385 }
2386 if (UseJVMCICompiler) {
2387 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2388 TypeProfileWidth = 8;
2389 }
2390 }
2391 }
2392 #endif
2393
2394 // Check lower bounds of the code cache
2395 // Template Interpreter code is approximately 3X larger in debug builds.
2396 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2397 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2398 jio_fprintf(defaultStream::error_stream(),
2399 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2400 os::vm_page_size()/K);
2401 status = false;
2402 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2403 jio_fprintf(defaultStream::error_stream(),
2404 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2405 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2406 status = false;
2407 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2408 jio_fprintf(defaultStream::error_stream(),
2409 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2410 min_code_cache_size/K);
2411 status = false;
2412 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2413 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2414 jio_fprintf(defaultStream::error_stream(),
2415 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2416 CODE_CACHE_SIZE_LIMIT/M);
2417 status = false;
2418 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2419 jio_fprintf(defaultStream::error_stream(),
2420 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2421 min_code_cache_size/K);
2422 status = false;
2423 }
2424
2425 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2426 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2427 }
2428
2429 #ifndef SUPPORT_RESERVED_STACK_AREA
2430 if (StackReservedPages != 0) {
2431 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2432 warning("Reserved Stack Area not supported on this platform");
2433 }
2434 #endif
2435 return status;
2436 }
2437
2438 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2439 const char* option_type) {
2440 if (ignore) return false;
2441
2442 const char* spacer = " ";
2443 if (option_type == NULL) {
2444 option_type = ++spacer; // Set both to the empty string.
2445 }
2446
2447 if (os::obsolete_option(option)) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Obsolete %s%soption: %s\n", option_type, spacer,
2450 option->optionString);
2451 return false;
2452 } else {
2453 jio_fprintf(defaultStream::error_stream(),
2454 "Unrecognized %s%soption: %s\n", option_type, spacer,
2455 option->optionString);
2456 return true;
2457 }
2458 }
2459
2460 static const char* user_assertion_options[] = {
2461 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2462 };
2463
2464 static const char* system_assertion_options[] = {
2465 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2466 };
2467
2468 bool Arguments::parse_uintx(const char* value,
2469 uintx* uintx_arg,
2470 uintx min_size) {
2471
2472 // Check the sign first since atomull() parses only unsigned values.
2473 bool value_is_positive = !(*value == '-');
2474
2475 if (value_is_positive) {
2476 julong n;
2477 bool good_return = atomull(value, &n);
2478 if (good_return) {
2479 bool above_minimum = n >= min_size;
2480 bool value_is_too_large = n > max_uintx;
2481
2482 if (above_minimum && !value_is_too_large) {
2483 *uintx_arg = n;
2484 return true;
2485 }
2486 }
2487 }
2488 return false;
2489 }
2490
2491 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2492 julong* long_arg,
2493 julong min_size) {
2494 if (!atomull(s, long_arg)) return arg_unreadable;
2495 return check_memory_size(*long_arg, min_size);
2496 }
2497
2498 // Parse JavaVMInitArgs structure
2499
2500 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2501 const JavaVMInitArgs *java_options_args,
2502 const JavaVMInitArgs *cmd_line_args) {
2503 // For components of the system classpath.
2504 SysClassPath scp(Arguments::get_sysclasspath());
2505 bool scp_assembly_required = false;
2506
2507 // Save default settings for some mode flags
2508 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2509 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2510 Arguments::_ClipInlining = ClipInlining;
2511 Arguments::_BackgroundCompilation = BackgroundCompilation;
2512 if (TieredCompilation) {
2513 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2514 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2515 }
2516
2517 // Setup flags for mixed which is the default
2518 set_mode_flags(_mixed);
2519
2520 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2521 // variable (if present).
2522 jint result = parse_each_vm_init_arg(
2523 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2524 if (result != JNI_OK) {
2525 return result;
2526 }
2527
2528 // Parse args structure generated from the command line flags.
2529 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2530 Flag::COMMAND_LINE);
2531 if (result != JNI_OK) {
2532 return result;
2533 }
2534
2535 // Parse args structure generated from the _JAVA_OPTIONS environment
2536 // variable (if present) (mimics classic VM)
2537 result = parse_each_vm_init_arg(
2538 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2539 if (result != JNI_OK) {
2540 return result;
2541 }
2542
2543 // Do final processing now that all arguments have been parsed
2544 result = finalize_vm_init_args(&scp, scp_assembly_required);
2545 if (result != JNI_OK) {
2546 return result;
2547 }
2548
2549 return JNI_OK;
2550 }
2551
2552 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2553 // represents a valid JDWP agent. is_path==true denotes that we
2554 // are dealing with -agentpath (case where name is a path), otherwise with
2555 // -agentlib
2556 bool valid_jdwp_agent(char *name, bool is_path) {
2557 char *_name;
2558 const char *_jdwp = "jdwp";
2559 size_t _len_jdwp, _len_prefix;
2560
2561 if (is_path) {
2562 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2563 return false;
2564 }
2565
2566 _name++; // skip past last path separator
2567 _len_prefix = strlen(JNI_LIB_PREFIX);
2568
2569 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2570 return false;
2571 }
2572
2573 _name += _len_prefix;
2574 _len_jdwp = strlen(_jdwp);
2575
2576 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2577 _name += _len_jdwp;
2578 }
2579 else {
2580 return false;
2581 }
2582
2583 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2584 return false;
2585 }
2586
2587 return true;
2588 }
2589
2590 if (strcmp(name, _jdwp) == 0) {
2591 return true;
2592 }
2593
2594 return false;
2595 }
2596
2597 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2598 SysClassPath* scp_p,
2599 bool* scp_assembly_required_p,
2600 Flag::Flags origin) {
2601 // Remaining part of option string
2602 const char* tail;
2603
2604 // iterate over arguments
2605 for (int index = 0; index < args->nOptions; index++) {
2606 bool is_absolute_path = false; // for -agentpath vs -agentlib
2607
2608 const JavaVMOption* option = args->options + index;
2609
2610 if (!match_option(option, "-Djava.class.path", &tail) &&
2611 !match_option(option, "-Dsun.java.command", &tail) &&
2612 !match_option(option, "-Dsun.java.launcher", &tail)) {
2613
2614 // add all jvm options to the jvm_args string. This string
2615 // is used later to set the java.vm.args PerfData string constant.
2616 // the -Djava.class.path and the -Dsun.java.command options are
2617 // omitted from jvm_args string as each have their own PerfData
2618 // string constant object.
2619 build_jvm_args(option->optionString);
2620 }
2621
2622 // -verbose:[class/gc/jni]
2623 if (match_option(option, "-verbose", &tail)) {
2624 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2625 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2626 return JNI_EINVAL;
2627 }
2628 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2629 return JNI_EINVAL;
2630 }
2631 } else if (!strcmp(tail, ":gc")) {
2632 // LogConfiguration_lock is not set up yet, but this code is executed by a single thread
2633 bool ret = LogConfiguration::parse_log_arguments("stdout", "gc", NULL, NULL, NULL);
2634 if (!ret) {
2635 return JNI_EINVAL;
2636 }
2637 } else if (!strcmp(tail, ":jni")) {
2638 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2639 return JNI_EINVAL;
2640 }
2641 }
2642 // -da / -ea / -disableassertions / -enableassertions
2643 // These accept an optional class/package name separated by a colon, e.g.,
2644 // -da:java.lang.Thread.
2645 } else if (match_option(option, user_assertion_options, &tail, true)) {
2646 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2647 if (*tail == '\0') {
2648 JavaAssertions::setUserClassDefault(enable);
2649 } else {
2650 assert(*tail == ':', "bogus match by match_option()");
2651 JavaAssertions::addOption(tail + 1, enable);
2652 }
2653 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2654 } else if (match_option(option, system_assertion_options, &tail, false)) {
2655 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2656 JavaAssertions::setSystemClassDefault(enable);
2657 // -bootclasspath:
2658 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2659 scp_p->reset_path(tail);
2660 *scp_assembly_required_p = true;
2661 // -bootclasspath/a:
2662 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2663 scp_p->add_suffix(tail);
2664 *scp_assembly_required_p = true;
2665 // -bootclasspath/p:
2666 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2667 scp_p->add_prefix(tail);
2668 *scp_assembly_required_p = true;
2669 // -Xrun
2670 } else if (match_option(option, "-Xrun", &tail)) {
2671 if (tail != NULL) {
2672 const char* pos = strchr(tail, ':');
2673 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2674 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2675 name[len] = '\0';
2676
2677 char *options = NULL;
2678 if(pos != NULL) {
2679 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2680 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2681 }
2682 #if !INCLUDE_JVMTI
2683 if (strcmp(name, "jdwp") == 0) {
2684 jio_fprintf(defaultStream::error_stream(),
2685 "Debugging agents are not supported in this VM\n");
2686 return JNI_ERR;
2687 }
2688 #endif // !INCLUDE_JVMTI
2689 add_init_library(name, options);
2690 }
2691 // -agentlib and -agentpath
2692 } else if (match_option(option, "-agentlib:", &tail) ||
2693 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2694 if(tail != NULL) {
2695 const char* pos = strchr(tail, '=');
2696 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2697 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2698 name[len] = '\0';
2699
2700 char *options = NULL;
2701 if(pos != NULL) {
2702 options = os::strdup_check_oom(pos + 1, mtInternal);
2703 }
2704 #if !INCLUDE_JVMTI
2705 if (valid_jdwp_agent(name, is_absolute_path)) {
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Debugging agents are not supported in this VM\n");
2708 return JNI_ERR;
2709 }
2710 #endif // !INCLUDE_JVMTI
2711 add_init_agent(name, options, is_absolute_path);
2712 }
2713 // -javaagent
2714 } else if (match_option(option, "-javaagent:", &tail)) {
2715 #if !INCLUDE_JVMTI
2716 jio_fprintf(defaultStream::error_stream(),
2717 "Instrumentation agents are not supported in this VM\n");
2718 return JNI_ERR;
2719 #else
2720 if(tail != NULL) {
2721 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2722 add_init_agent("instrument", options, false);
2723 }
2724 #endif // !INCLUDE_JVMTI
2725 // -Xnoclassgc
2726 } else if (match_option(option, "-Xnoclassgc")) {
2727 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 // -Xconcgc
2731 } else if (match_option(option, "-Xconcgc")) {
2732 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2733 return JNI_EINVAL;
2734 }
2735 // -Xnoconcgc
2736 } else if (match_option(option, "-Xnoconcgc")) {
2737 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2738 return JNI_EINVAL;
2739 }
2740 // -Xbatch
2741 } else if (match_option(option, "-Xbatch")) {
2742 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2743 return JNI_EINVAL;
2744 }
2745 // -Xmn for compatibility with other JVM vendors
2746 } else if (match_option(option, "-Xmn", &tail)) {
2747 julong long_initial_young_size = 0;
2748 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2749 if (errcode != arg_in_range) {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "Invalid initial young generation size: %s\n", option->optionString);
2752 describe_range_error(errcode);
2753 return JNI_EINVAL;
2754 }
2755 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2756 return JNI_EINVAL;
2757 }
2758 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2759 return JNI_EINVAL;
2760 }
2761 // -Xms
2762 } else if (match_option(option, "-Xms", &tail)) {
2763 julong long_initial_heap_size = 0;
2764 // an initial heap size of 0 means automatically determine
2765 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2766 if (errcode != arg_in_range) {
2767 jio_fprintf(defaultStream::error_stream(),
2768 "Invalid initial heap size: %s\n", option->optionString);
2769 describe_range_error(errcode);
2770 return JNI_EINVAL;
2771 }
2772 set_min_heap_size((size_t)long_initial_heap_size);
2773 // Currently the minimum size and the initial heap sizes are the same.
2774 // Can be overridden with -XX:InitialHeapSize.
2775 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 // -Xmx
2779 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2780 julong long_max_heap_size = 0;
2781 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2782 if (errcode != arg_in_range) {
2783 jio_fprintf(defaultStream::error_stream(),
2784 "Invalid maximum heap size: %s\n", option->optionString);
2785 describe_range_error(errcode);
2786 return JNI_EINVAL;
2787 }
2788 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2789 return JNI_EINVAL;
2790 }
2791 // Xmaxf
2792 } else if (match_option(option, "-Xmaxf", &tail)) {
2793 char* err;
2794 int maxf = (int)(strtod(tail, &err) * 100);
2795 if (*err != '\0' || *tail == '\0') {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Bad max heap free percentage size: %s\n",
2798 option->optionString);
2799 return JNI_EINVAL;
2800 } else {
2801 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2802 return JNI_EINVAL;
2803 }
2804 }
2805 // Xminf
2806 } else if (match_option(option, "-Xminf", &tail)) {
2807 char* err;
2808 int minf = (int)(strtod(tail, &err) * 100);
2809 if (*err != '\0' || *tail == '\0') {
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Bad min heap free percentage size: %s\n",
2812 option->optionString);
2813 return JNI_EINVAL;
2814 } else {
2815 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2816 return JNI_EINVAL;
2817 }
2818 }
2819 // -Xss
2820 } else if (match_option(option, "-Xss", &tail)) {
2821 julong long_ThreadStackSize = 0;
2822 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2823 if (errcode != arg_in_range) {
2824 jio_fprintf(defaultStream::error_stream(),
2825 "Invalid thread stack size: %s\n", option->optionString);
2826 describe_range_error(errcode);
2827 return JNI_EINVAL;
2828 }
2829 // Internally track ThreadStackSize in units of 1024 bytes.
2830 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2831 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2835 } else if (match_option(option, "-Xoss", &tail) ||
2836 match_option(option, "-Xsqnopause") ||
2837 match_option(option, "-Xoptimize") ||
2838 match_option(option, "-Xboundthreads") ||
2839 match_option(option, "-Xusealtsigs")) {
2840 // All these options are deprecated in JDK 9 and will be removed in a future release
2841 char version[256];
2842 JDK_Version::jdk(9).to_string(version, sizeof(version));
2843 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2844 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2845 julong long_CodeCacheExpansionSize = 0;
2846 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2847 if (errcode != arg_in_range) {
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2850 os::vm_page_size()/K);
2851 return JNI_EINVAL;
2852 }
2853 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2857 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2858 julong long_ReservedCodeCacheSize = 0;
2859
2860 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2861 if (errcode != arg_in_range) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Invalid maximum code cache size: %s.\n", option->optionString);
2864 return JNI_EINVAL;
2865 }
2866 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 // -XX:NonNMethodCodeHeapSize=
2870 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2871 julong long_NonNMethodCodeHeapSize = 0;
2872
2873 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2874 if (errcode != arg_in_range) {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2877 return JNI_EINVAL;
2878 }
2879 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882 // -XX:ProfiledCodeHeapSize=
2883 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2884 julong long_ProfiledCodeHeapSize = 0;
2885
2886 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2887 if (errcode != arg_in_range) {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2890 return JNI_EINVAL;
2891 }
2892 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 // -XX:NonProfiledCodeHeapSizee=
2896 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2897 julong long_NonProfiledCodeHeapSize = 0;
2898
2899 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2900 if (errcode != arg_in_range) {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2903 return JNI_EINVAL;
2904 }
2905 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2906 return JNI_EINVAL;
2907 }
2908 // -green
2909 } else if (match_option(option, "-green")) {
2910 jio_fprintf(defaultStream::error_stream(),
2911 "Green threads support not available\n");
2912 return JNI_EINVAL;
2913 // -native
2914 } else if (match_option(option, "-native")) {
2915 // HotSpot always uses native threads, ignore silently for compatibility
2916 // -Xrs
2917 } else if (match_option(option, "-Xrs")) {
2918 // Classic/EVM option, new functionality
2919 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2920 return JNI_EINVAL;
2921 }
2922 // -Xprof
2923 } else if (match_option(option, "-Xprof")) {
2924 #if INCLUDE_FPROF
2925 _has_profile = true;
2926 #else // INCLUDE_FPROF
2927 jio_fprintf(defaultStream::error_stream(),
2928 "Flat profiling is not supported in this VM.\n");
2929 return JNI_ERR;
2930 #endif // INCLUDE_FPROF
2931 // -Xconcurrentio
2932 } else if (match_option(option, "-Xconcurrentio")) {
2933 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2934 return JNI_EINVAL;
2935 }
2936 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2943 return JNI_EINVAL;
2944 }
2945 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2946 return JNI_EINVAL;
2947 }
2948
2949 // -Xinternalversion
2950 } else if (match_option(option, "-Xinternalversion")) {
2951 jio_fprintf(defaultStream::output_stream(), "%s\n",
2952 VM_Version::internal_vm_info_string());
2953 vm_exit(0);
2954 #ifndef PRODUCT
2955 // -Xprintflags
2956 } else if (match_option(option, "-Xprintflags")) {
2957 CommandLineFlags::printFlags(tty, false);
2958 vm_exit(0);
2959 #endif
2960 // -D
2961 } else if (match_option(option, "-D", &tail)) {
2962 const char* value;
2963 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2964 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2965 // abort if -Djava.endorsed.dirs is set
2966 jio_fprintf(defaultStream::output_stream(),
2967 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2968 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2969 return JNI_EINVAL;
2970 }
2971 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2972 *value != '\0' && strcmp(value, "\"\"") != 0) {
2973 // abort if -Djava.ext.dirs is set
2974 jio_fprintf(defaultStream::output_stream(),
2975 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2976 return JNI_EINVAL;
2977 }
2978
2979 if (!add_property(tail)) {
2980 return JNI_ENOMEM;
2981 }
2982 // Out of the box management support
2983 if (match_option(option, "-Dcom.sun.management", &tail)) {
2984 #if INCLUDE_MANAGEMENT
2985 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2986 return JNI_EINVAL;
2987 }
2988 #else
2989 jio_fprintf(defaultStream::output_stream(),
2990 "-Dcom.sun.management is not supported in this VM.\n");
2991 return JNI_ERR;
2992 #endif
2993 }
2994 // -Xint
2995 } else if (match_option(option, "-Xint")) {
2996 set_mode_flags(_int);
2997 // -Xmixed
2998 } else if (match_option(option, "-Xmixed")) {
2999 set_mode_flags(_mixed);
3000 // -Xcomp
3001 } else if (match_option(option, "-Xcomp")) {
3002 // for testing the compiler; turn off all flags that inhibit compilation
3003 set_mode_flags(_comp);
3004 // -Xshare:dump
3005 } else if (match_option(option, "-Xshare:dump")) {
3006 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3007 return JNI_EINVAL;
3008 }
3009 set_mode_flags(_int); // Prevent compilation, which creates objects
3010 // -Xshare:on
3011 } else if (match_option(option, "-Xshare:on")) {
3012 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3016 return JNI_EINVAL;
3017 }
3018 // -Xshare:auto
3019 } else if (match_option(option, "-Xshare:auto")) {
3020 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3021 return JNI_EINVAL;
3022 }
3023 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3024 return JNI_EINVAL;
3025 }
3026 // -Xshare:off
3027 } else if (match_option(option, "-Xshare:off")) {
3028 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3029 return JNI_EINVAL;
3030 }
3031 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3032 return JNI_EINVAL;
3033 }
3034 // -Xverify
3035 } else if (match_option(option, "-Xverify", &tail)) {
3036 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3037 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3038 return JNI_EINVAL;
3039 }
3040 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3041 return JNI_EINVAL;
3042 }
3043 } else if (strcmp(tail, ":remote") == 0) {
3044 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3045 return JNI_EINVAL;
3046 }
3047 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 } else if (strcmp(tail, ":none") == 0) {
3051 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3052 return JNI_EINVAL;
3053 }
3054 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3058 return JNI_EINVAL;
3059 }
3060 // -Xdebug
3061 } else if (match_option(option, "-Xdebug")) {
3062 // note this flag has been used, then ignore
3063 set_xdebug_mode(true);
3064 // -Xnoagent
3065 } else if (match_option(option, "-Xnoagent")) {
3066 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3067 } else if (match_option(option, "-Xlog", &tail)) {
3068 bool ret = false;
3069 if (strcmp(tail, ":help") == 0) {
3070 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3071 vm_exit(0);
3072 } else if (strcmp(tail, ":disable") == 0) {
3073 LogConfiguration::disable_logging();
3074 ret = true;
3075 } else if (*tail == '\0') {
3076 ret = LogConfiguration::parse_command_line_arguments();
3077 assert(ret, "-Xlog without arguments should never fail to parse");
3078 } else if (*tail == ':') {
3079 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3080 }
3081 if (ret == false) {
3082 jio_fprintf(defaultStream::error_stream(),
3083 "Invalid -Xlog option '-Xlog%s'\n",
3084 tail);
3085 return JNI_EINVAL;
3086 }
3087 // JNI hooks
3088 } else if (match_option(option, "-Xcheck", &tail)) {
3089 if (!strcmp(tail, ":jni")) {
3090 #if !INCLUDE_JNI_CHECK
3091 warning("JNI CHECKING is not supported in this VM");
3092 #else
3093 CheckJNICalls = true;
3094 #endif // INCLUDE_JNI_CHECK
3095 } else if (is_bad_option(option, args->ignoreUnrecognized,
3096 "check")) {
3097 return JNI_EINVAL;
3098 }
3099 } else if (match_option(option, "vfprintf")) {
3100 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3101 } else if (match_option(option, "exit")) {
3102 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3103 } else if (match_option(option, "abort")) {
3104 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3105 // -XX:+AggressiveHeap
3106 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3107 jint result = set_aggressive_heap_flags();
3108 if (result != JNI_OK) {
3109 return result;
3110 }
3111 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3112 // and the last option wins.
3113 } else if (match_option(option, "-XX:+NeverTenure")) {
3114 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3115 return JNI_EINVAL;
3116 }
3117 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3118 return JNI_EINVAL;
3119 }
3120 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3121 return JNI_EINVAL;
3122 }
3123 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3124 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3128 return JNI_EINVAL;
3129 }
3130 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3131 return JNI_EINVAL;
3132 }
3133 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3134 uintx max_tenuring_thresh = 0;
3135 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3136 jio_fprintf(defaultStream::error_stream(),
3137 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3138 return JNI_EINVAL;
3139 }
3140
3141 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3142 return JNI_EINVAL;
3143 }
3144
3145 if (MaxTenuringThreshold == 0) {
3146 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 } else {
3153 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3154 return JNI_EINVAL;
3155 }
3156 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3157 return JNI_EINVAL;
3158 }
3159 }
3160 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3161 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3162 return JNI_EINVAL;
3163 }
3164 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3165 return JNI_EINVAL;
3166 }
3167 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3168 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3169 return JNI_EINVAL;
3170 }
3171 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3175 #if defined(DTRACE_ENABLED)
3176 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3180 return JNI_EINVAL;
3181 }
3182 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3183 return JNI_EINVAL;
3184 }
3185 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 #else // defined(DTRACE_ENABLED)
3189 jio_fprintf(defaultStream::error_stream(),
3190 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3191 return JNI_EINVAL;
3192 #endif // defined(DTRACE_ENABLED)
3193 #ifdef ASSERT
3194 } else if (match_option(option, "-XX:+FullGCALot")) {
3195 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3196 return JNI_EINVAL;
3197 }
3198 // disable scavenge before parallel mark-compact
3199 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3200 return JNI_EINVAL;
3201 }
3202 #endif
3203 #if !INCLUDE_MANAGEMENT
3204 } else if (match_option(option, "-XX:+ManagementServer")) {
3205 jio_fprintf(defaultStream::error_stream(),
3206 "ManagementServer is not supported in this VM.\n");
3207 return JNI_ERR;
3208 #endif // INCLUDE_MANAGEMENT
3209 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3210 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3211 // already been handled
3212 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3213 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3214 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3215 return JNI_EINVAL;
3216 }
3217 }
3218 // Unknown option
3219 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3220 return JNI_ERR;
3221 }
3222 }
3223
3224 // PrintSharedArchiveAndExit will turn on
3225 // -Xshare:on
3226 // -XX:+TraceClassPaths
3227 if (PrintSharedArchiveAndExit) {
3228 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3229 return JNI_EINVAL;
3230 }
3231 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3232 return JNI_EINVAL;
3233 }
3234 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3235 return JNI_EINVAL;
3236 }
3237 }
3238
3239 // Change the default value for flags which have different default values
3240 // when working with older JDKs.
3241 #ifdef LINUX
3242 if (JDK_Version::current().compare_major(6) <= 0 &&
3243 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3244 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3245 }
3246 #endif // LINUX
3247 fix_appclasspath();
3248 return JNI_OK;
3249 }
3250
3251 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3252 //
3253 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3254 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3255 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3256 // path is treated as the current directory.
3257 //
3258 // This causes problems with CDS, which requires that all directories specified in the classpath
3259 // must be empty. In most cases, applications do NOT want to load classes from the current
3260 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3261 // scripts compatible with CDS.
3262 void Arguments::fix_appclasspath() {
3263 if (IgnoreEmptyClassPaths) {
3264 const char separator = *os::path_separator();
3265 const char* src = _java_class_path->value();
3266
3267 // skip over all the leading empty paths
3268 while (*src == separator) {
3269 src ++;
3270 }
3271
3272 char* copy = os::strdup_check_oom(src, mtInternal);
3273
3274 // trim all trailing empty paths
3275 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3276 *tail = '\0';
3277 }
3278
3279 char from[3] = {separator, separator, '\0'};
3280 char to [2] = {separator, '\0'};
3281 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3282 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3283 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3284 }
3285
3286 _java_class_path->set_value(copy);
3287 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3288 }
3289
3290 if (!PrintSharedArchiveAndExit) {
3291 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3292 }
3293 }
3294
3295 static bool has_jar_files(const char* directory) {
3296 DIR* dir = os::opendir(directory);
3297 if (dir == NULL) return false;
3298
3299 struct dirent *entry;
3300 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3301 bool hasJarFile = false;
3302 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3303 const char* name = entry->d_name;
3304 const char* ext = name + strlen(name) - 4;
3305 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3306 }
3307 FREE_C_HEAP_ARRAY(char, dbuf);
3308 os::closedir(dir);
3309 return hasJarFile ;
3310 }
3311
3312 static int check_non_empty_dirs(const char* path) {
3313 const char separator = *os::path_separator();
3314 const char* const end = path + strlen(path);
3315 int nonEmptyDirs = 0;
3316 while (path < end) {
3317 const char* tmp_end = strchr(path, separator);
3318 if (tmp_end == NULL) {
3319 if (has_jar_files(path)) {
3320 nonEmptyDirs++;
3321 jio_fprintf(defaultStream::output_stream(),
3322 "Non-empty directory: %s\n", path);
3323 }
3324 path = end;
3325 } else {
3326 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3327 memcpy(dirpath, path, tmp_end - path);
3328 dirpath[tmp_end - path] = '\0';
3329 if (has_jar_files(dirpath)) {
3330 nonEmptyDirs++;
3331 jio_fprintf(defaultStream::output_stream(),
3332 "Non-empty directory: %s\n", dirpath);
3333 }
3334 FREE_C_HEAP_ARRAY(char, dirpath);
3335 path = tmp_end + 1;
3336 }
3337 }
3338 return nonEmptyDirs;
3339 }
3340
3341 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3342 // check if the default lib/endorsed directory exists; if so, error
3343 char path[JVM_MAXPATHLEN];
3344 const char* fileSep = os::file_separator();
3345 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3346
3347 if (CheckEndorsedAndExtDirs) {
3348 int nonEmptyDirs = 0;
3349 // check endorsed directory
3350 nonEmptyDirs += check_non_empty_dirs(path);
3351 // check the extension directories
3352 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3353 if (nonEmptyDirs > 0) {
3354 return JNI_ERR;
3355 }
3356 }
3357
3358 DIR* dir = os::opendir(path);
3359 if (dir != NULL) {
3360 jio_fprintf(defaultStream::output_stream(),
3361 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3362 "in modular form will be supported via the concept of upgradeable modules.\n");
3363 os::closedir(dir);
3364 return JNI_ERR;
3365 }
3366
3367 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3368 dir = os::opendir(path);
3369 if (dir != NULL) {
3370 jio_fprintf(defaultStream::output_stream(),
3371 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3372 "Use -classpath instead.\n.");
3373 os::closedir(dir);
3374 return JNI_ERR;
3375 }
3376
3377 if (scp_assembly_required) {
3378 // Assemble the bootclasspath elements into the final path.
3379 char *combined_path = scp_p->combined_path();
3380 Arguments::set_sysclasspath(combined_path);
3381 FREE_C_HEAP_ARRAY(char, combined_path);
3382 }
3383
3384 // This must be done after all arguments have been processed.
3385 // java_compiler() true means set to "NONE" or empty.
3386 if (java_compiler() && !xdebug_mode()) {
3387 // For backwards compatibility, we switch to interpreted mode if
3388 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3389 // not specified.
3390 set_mode_flags(_int);
3391 }
3392
3393 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3394 // but like -Xint, leave compilation thresholds unaffected.
3395 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3396 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3397 set_mode_flags(_int);
3398 }
3399
3400 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3401 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3402 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3403 }
3404
3405 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3406 // Don't degrade server performance for footprint
3407 if (FLAG_IS_DEFAULT(UseLargePages) &&
3408 MaxHeapSize < LargePageHeapSizeThreshold) {
3409 // No need for large granularity pages w/small heaps.
3410 // Note that large pages are enabled/disabled for both the
3411 // Java heap and the code cache.
3412 FLAG_SET_DEFAULT(UseLargePages, false);
3413 }
3414
3415 #elif defined(COMPILER2)
3416 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3417 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3418 }
3419 #endif
3420
3421 #ifndef TIERED
3422 // Tiered compilation is undefined.
3423 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3424 #endif
3425
3426 // If we are running in a headless jre, force java.awt.headless property
3427 // to be true unless the property has already been set.
3428 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3429 if (os::is_headless_jre()) {
3430 const char* headless = Arguments::get_property("java.awt.headless");
3431 if (headless == NULL) {
3432 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3433 if (headless_env == NULL) {
3434 if (!add_property("java.awt.headless=true")) {
3435 return JNI_ENOMEM;
3436 }
3437 } else {
3438 char buffer[256];
3439 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3440 if (!add_property(buffer)) {
3441 return JNI_ENOMEM;
3442 }
3443 }
3444 }
3445 }
3446
3447 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3448 // CMS can only be used with ParNew
3449 FLAG_SET_ERGO(bool, UseParNewGC, true);
3450 }
3451
3452 if (!check_vm_args_consistency()) {
3453 return JNI_ERR;
3454 }
3455
3456 return JNI_OK;
3457 }
3458
3459 // Helper class for controlling the lifetime of JavaVMInitArgs
3460 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3461 // deleted on the destruction of the ScopedVMInitArgs object.
3462 class ScopedVMInitArgs : public StackObj {
3463 private:
3464 JavaVMInitArgs _args;
3465 bool _is_set;
3466
3467 public:
3468 ScopedVMInitArgs() {
3469 _args.version = JNI_VERSION_1_2;
3470 _args.nOptions = 0;
3471 _args.options = NULL;
3472 _args.ignoreUnrecognized = false;
3473 _is_set = false;
3474 }
3475
3476 // Populates the JavaVMInitArgs object represented by this
3477 // ScopedVMInitArgs object with the arguments in options. The
3478 // allocated memory is deleted by the destructor. If this method
3479 // returns anything other than JNI_OK, then this object is in a
3480 // partially constructed state, and should be abandoned.
3481 jint set_args(GrowableArray<JavaVMOption>* options) {
3482 _is_set = true;
3483 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3484 JavaVMOption, options->length(), mtInternal);
3485 if (options_arr == NULL) {
3486 return JNI_ENOMEM;
3487 }
3488 _args.options = options_arr;
3489
3490 for (int i = 0; i < options->length(); i++) {
3491 options_arr[i] = options->at(i);
3492 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3493 if (options_arr[i].optionString == NULL) {
3494 // Rely on the destructor to do cleanup.
3495 _args.nOptions = i;
3496 return JNI_ENOMEM;
3497 }
3498 }
3499
3500 _args.nOptions = options->length();
3501 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3502 return JNI_OK;
3503 }
3504
3505 JavaVMInitArgs* get() { return &_args; }
3506 bool is_set() { return _is_set; }
3507
3508 ~ScopedVMInitArgs() {
3509 if (_args.options == NULL) return;
3510 for (int i = 0; i < _args.nOptions; i++) {
3511 os::free(_args.options[i].optionString);
3512 }
3513 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3514 }
3515
3516 // Insert options into this option list, to replace option at
3517 // vm_options_file_pos (-XX:VMOptionsFile)
3518 jint insert(const JavaVMInitArgs* args,
3519 const JavaVMInitArgs* args_to_insert,
3520 const int vm_options_file_pos) {
3521 assert(_args.options == NULL, "shouldn't be set yet");
3522 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3523 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3524
3525 int length = args->nOptions + args_to_insert->nOptions - 1;
3526 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3527 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3528 for (int i = 0; i < args->nOptions; i++) {
3529 if (i == vm_options_file_pos) {
3530 // insert the new options starting at the same place as the
3531 // -XX:VMOptionsFile option
3532 for (int j = 0; j < args_to_insert->nOptions; j++) {
3533 options->push(args_to_insert->options[j]);
3534 }
3535 } else {
3536 options->push(args->options[i]);
3537 }
3538 }
3539 // make into options array
3540 jint result = set_args(options);
3541 delete options;
3542 return result;
3543 }
3544 };
3545
3546 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3547 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3548 }
3549
3550 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3551 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3552 }
3553
3554 jint Arguments::parse_options_environment_variable(const char* name,
3555 ScopedVMInitArgs* vm_args) {
3556 char *buffer = ::getenv(name);
3557
3558 // Don't check this environment variable if user has special privileges
3559 // (e.g. unix su command).
3560 if (buffer == NULL || os::have_special_privileges()) {
3561 return JNI_OK;
3562 }
3563
3564 if ((buffer = os::strdup(buffer)) == NULL) {
3565 return JNI_ENOMEM;
3566 }
3567
3568 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3569
3570 os::free(buffer);
3571 return retcode;
3572 }
3573
3574 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3575 // read file into buffer
3576 int fd = ::open(file_name, O_RDONLY);
3577 if (fd < 0) {
3578 jio_fprintf(defaultStream::error_stream(),
3579 "Could not open options file '%s'\n",
3580 file_name);
3581 return JNI_ERR;
3582 }
3583
3584 struct stat stbuf;
3585 int retcode = os::stat(file_name, &stbuf);
3586 if (retcode != 0) {
3587 jio_fprintf(defaultStream::error_stream(),
3588 "Could not stat options file '%s'\n",
3589 file_name);
3590 os::close(fd);
3591 return JNI_ERR;
3592 }
3593
3594 if (stbuf.st_size == 0) {
3595 // tell caller there is no option data and that is ok
3596 os::close(fd);
3597 return JNI_OK;
3598 }
3599
3600 // '+ 1' for NULL termination even with max bytes
3601 size_t bytes_alloc = stbuf.st_size + 1;
3602
3603 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3604 if (NULL == buf) {
3605 jio_fprintf(defaultStream::error_stream(),
3606 "Could not allocate read buffer for options file parse\n");
3607 os::close(fd);
3608 return JNI_ENOMEM;
3609 }
3610
3611 memset(buf, 0, bytes_alloc);
3612
3613 // Fill buffer
3614 // Use ::read() instead of os::read because os::read()
3615 // might do a thread state transition
3616 // and it is too early for that here
3617
3618 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3619 os::close(fd);
3620 if (bytes_read < 0) {
3621 FREE_C_HEAP_ARRAY(char, buf);
3622 jio_fprintf(defaultStream::error_stream(),
3623 "Could not read options file '%s'\n", file_name);
3624 return JNI_ERR;
3625 }
3626
3627 if (bytes_read == 0) {
3628 // tell caller there is no option data and that is ok
3629 FREE_C_HEAP_ARRAY(char, buf);
3630 return JNI_OK;
3631 }
3632
3633 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3634
3635 FREE_C_HEAP_ARRAY(char, buf);
3636 return retcode;
3637 }
3638
3639 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3640 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3641
3642 // some pointers to help with parsing
3643 char *buffer_end = buffer + buf_len;
3644 char *opt_hd = buffer;
3645 char *wrt = buffer;
3646 char *rd = buffer;
3647
3648 // parse all options
3649 while (rd < buffer_end) {
3650 // skip leading white space from the input string
3651 while (rd < buffer_end && isspace(*rd)) {
3652 rd++;
3653 }
3654
3655 if (rd >= buffer_end) {
3656 break;
3657 }
3658
3659 // Remember this is where we found the head of the token.
3660 opt_hd = wrt;
3661
3662 // Tokens are strings of non white space characters separated
3663 // by one or more white spaces.
3664 while (rd < buffer_end && !isspace(*rd)) {
3665 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3666 int quote = *rd; // matching quote to look for
3667 rd++; // don't copy open quote
3668 while (rd < buffer_end && *rd != quote) {
3669 // include everything (even spaces)
3670 // up until the close quote
3671 *wrt++ = *rd++; // copy to option string
3672 }
3673
3674 if (rd < buffer_end) {
3675 rd++; // don't copy close quote
3676 } else {
3677 // did not see closing quote
3678 jio_fprintf(defaultStream::error_stream(),
3679 "Unmatched quote in %s\n", name);
3680 delete options;
3681 return JNI_ERR;
3682 }
3683 } else {
3684 *wrt++ = *rd++; // copy to option string
3685 }
3686 }
3687
3688 // steal a white space character and set it to NULL
3689 *wrt++ = '\0';
3690 // We now have a complete token
3691
3692 JavaVMOption option;
3693 option.optionString = opt_hd;
3694 option.extraInfo = NULL;
3695
3696 options->append(option); // Fill in option
3697
3698 rd++; // Advance to next character
3699 }
3700
3701 // Fill out JavaVMInitArgs structure.
3702 jint status = vm_args->set_args(options);
3703
3704 delete options;
3705 return status;
3706 }
3707
3708 void Arguments::set_shared_spaces_flags() {
3709 if (DumpSharedSpaces) {
3710 if (RequireSharedSpaces) {
3711 warning("Cannot dump shared archive while using shared archive");
3712 }
3713 UseSharedSpaces = false;
3714 #ifdef _LP64
3715 if (!UseCompressedOops || !UseCompressedClassPointers) {
3716 vm_exit_during_initialization(
3717 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3718 }
3719 } else {
3720 if (!UseCompressedOops || !UseCompressedClassPointers) {
3721 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3722 }
3723 #endif
3724 }
3725 }
3726
3727 #if !INCLUDE_ALL_GCS
3728 static void force_serial_gc() {
3729 FLAG_SET_DEFAULT(UseSerialGC, true);
3730 UNSUPPORTED_GC_OPTION(UseG1GC);
3731 UNSUPPORTED_GC_OPTION(UseParallelGC);
3732 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3733 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3734 UNSUPPORTED_GC_OPTION(UseParNewGC);
3735 }
3736 #endif // INCLUDE_ALL_GCS
3737
3738 // Sharing support
3739 // Construct the path to the archive
3740 static char* get_shared_archive_path() {
3741 char *shared_archive_path;
3742 if (SharedArchiveFile == NULL) {
3743 char jvm_path[JVM_MAXPATHLEN];
3744 os::jvm_path(jvm_path, sizeof(jvm_path));
3745 char *end = strrchr(jvm_path, *os::file_separator());
3746 if (end != NULL) *end = '\0';
3747 size_t jvm_path_len = strlen(jvm_path);
3748 size_t file_sep_len = strlen(os::file_separator());
3749 const size_t len = jvm_path_len + file_sep_len + 20;
3750 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3751 if (shared_archive_path != NULL) {
3752 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3753 jvm_path, os::file_separator());
3754 }
3755 } else {
3756 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3757 }
3758 return shared_archive_path;
3759 }
3760
3761 #ifndef PRODUCT
3762 // Determine whether LogVMOutput should be implicitly turned on.
3763 static bool use_vm_log() {
3764 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3765 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3766 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3767 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3768 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3769 return true;
3770 }
3771
3772 #ifdef COMPILER1
3773 if (PrintC1Statistics) {
3774 return true;
3775 }
3776 #endif // COMPILER1
3777
3778 #ifdef COMPILER2
3779 if (PrintOptoAssembly || PrintOptoStatistics) {
3780 return true;
3781 }
3782 #endif // COMPILER2
3783
3784 return false;
3785 }
3786
3787 #endif // PRODUCT
3788
3789 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3790 char** vm_options_file,
3791 const int vm_options_file_pos,
3792 ScopedVMInitArgs *vm_options_file_args,
3793 ScopedVMInitArgs* args_out) {
3794 jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args);
3795 if (code != JNI_OK) {
3796 return code;
3797 }
3798
3799 if (vm_options_file_args->get()->nOptions < 1) {
3800 return JNI_OK;
3801 }
3802
3803 return args_out->insert(args, vm_options_file_args->get(),
3804 vm_options_file_pos);
3805 }
3806
3807 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3808 char ** vm_options_file,
3809 ScopedVMInitArgs* args_out) {
3810 // Remaining part of option string
3811 const char* tail;
3812 int vm_options_file_pos = -1;
3813 ScopedVMInitArgs vm_options_file_args;
3814
3815 for (int index = 0; index < args->nOptions; index++) {
3816 const JavaVMOption* option = args->options + index;
3817 if (ArgumentsExt::process_options(option)) {
3818 continue;
3819 }
3820 if (match_option(option, "-XX:Flags=", &tail)) {
3821 Arguments::set_jvm_flags_file(tail);
3822 continue;
3823 }
3824 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3825 if (vm_options_file != NULL) {
3826 // The caller accepts -XX:VMOptionsFile
3827 if (*vm_options_file != NULL) {
3828 jio_fprintf(defaultStream::error_stream(),
3829 "The VM Options file can only be specified once and "
3830 "only on the command line.\n");
3831 return JNI_EINVAL;
3832 }
3833
3834 *vm_options_file = (char *) tail;
3835 vm_options_file_pos = index; // save position of -XX:VMOptionsFile
3836 // If there's a VMOptionsFile, parse that (also can set flags_file)
3837 jint code = insert_vm_options_file(args, vm_options_file,
3838 vm_options_file_pos,
3839 &vm_options_file_args, args_out);
3840 if (code != JNI_OK) {
3841 return code;
3842 }
3843 if (args_out->is_set()) {
3844 // The VMOptions file inserted some options so switch 'args'
3845 // to the new set of options, and continue processing which
3846 // preserves "last option wins" semantics.
3847 args = args_out->get();
3848 // The first option from the VMOptionsFile replaces the
3849 // current option. So we back track to process the
3850 // replacement option.
3851 index--;
3852 }
3853 } else {
3854 jio_fprintf(defaultStream::error_stream(),
3855 "VM options file is only supported on the command line\n");
3856 return JNI_EINVAL;
3857 }
3858 continue;
3859 }
3860 if (match_option(option, "-XX:+PrintVMOptions")) {
3861 PrintVMOptions = true;
3862 continue;
3863 }
3864 if (match_option(option, "-XX:-PrintVMOptions")) {
3865 PrintVMOptions = false;
3866 continue;
3867 }
3868 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3869 IgnoreUnrecognizedVMOptions = true;
3870 continue;
3871 }
3872 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3873 IgnoreUnrecognizedVMOptions = false;
3874 continue;
3875 }
3876 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3877 CommandLineFlags::printFlags(tty, false);
3878 vm_exit(0);
3879 }
3880 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3881 #if INCLUDE_NMT
3882 // The launcher did not setup nmt environment variable properly.
3883 if (!MemTracker::check_launcher_nmt_support(tail)) {
3884 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3885 }
3886
3887 // Verify if nmt option is valid.
3888 if (MemTracker::verify_nmt_option()) {
3889 // Late initialization, still in single-threaded mode.
3890 if (MemTracker::tracking_level() >= NMT_summary) {
3891 MemTracker::init();
3892 }
3893 } else {
3894 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3895 }
3896 continue;
3897 #else
3898 jio_fprintf(defaultStream::error_stream(),
3899 "Native Memory Tracking is not supported in this VM\n");
3900 return JNI_ERR;
3901 #endif
3902 }
3903
3904 #ifndef PRODUCT
3905 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3906 CommandLineFlags::printFlags(tty, true);
3907 vm_exit(0);
3908 }
3909 #endif
3910 }
3911 return JNI_OK;
3912 }
3913
3914 static void print_options(const JavaVMInitArgs *args) {
3915 const char* tail;
3916 for (int index = 0; index < args->nOptions; index++) {
3917 const JavaVMOption *option = args->options + index;
3918 if (match_option(option, "-XX:", &tail)) {
3919 logOption(tail);
3920 }
3921 }
3922 }
3923
3924 // Parse entry point called from JNI_CreateJavaVM
3925
3926 jint Arguments::parse(const JavaVMInitArgs* args) {
3927 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3928
3929 // Initialize ranges and constraints
3930 CommandLineFlagRangeList::init();
3931 CommandLineFlagConstraintList::init();
3932
3933 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3934 const char* hotspotrc = ".hotspotrc";
3935 char* vm_options_file = NULL;
3936 bool settings_file_specified = false;
3937 bool needs_hotspotrc_warning = false;
3938 ScopedVMInitArgs java_tool_options_args;
3939 ScopedVMInitArgs java_options_args;
3940 ScopedVMInitArgs modified_cmd_line_args;
3941
3942 jint code =
3943 parse_java_tool_options_environment_variable(&java_tool_options_args);
3944 if (code != JNI_OK) {
3945 return code;
3946 }
3947
3948 code = parse_java_options_environment_variable(&java_options_args);
3949 if (code != JNI_OK) {
3950 return code;
3951 }
3952
3953 code = match_special_option_and_act(java_tool_options_args.get(),
3954 NULL, NULL);
3955 if (code != JNI_OK) {
3956 return code;
3957 }
3958
3959 code = match_special_option_and_act(args, &vm_options_file,
3960 &modified_cmd_line_args);
3961 if (code != JNI_OK) {
3962 return code;
3963 }
3964
3965
3966 // The command line arguments have been modified to include VMOptionsFile arguments.
3967 if (modified_cmd_line_args.is_set()) {
3968 args = modified_cmd_line_args.get();
3969 }
3970
3971 code = match_special_option_and_act(java_options_args.get(),
3972 NULL, NULL);
3973 if (code != JNI_OK) {
3974 return code;
3975 }
3976
3977 const char * flags_file = Arguments::get_jvm_flags_file();
3978 settings_file_specified = (flags_file != NULL);
3979
3980 if (IgnoreUnrecognizedVMOptions) {
3981 // uncast const to modify the flag args->ignoreUnrecognized
3982 *(jboolean*)(&args->ignoreUnrecognized) = true;
3983 java_tool_options_args.get()->ignoreUnrecognized = true;
3984 java_options_args.get()->ignoreUnrecognized = true;
3985 }
3986
3987 // Parse specified settings file
3988 if (settings_file_specified) {
3989 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3990 return JNI_EINVAL;
3991 }
3992 } else {
3993 #ifdef ASSERT
3994 // Parse default .hotspotrc settings file
3995 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3996 return JNI_EINVAL;
3997 }
3998 #else
3999 struct stat buf;
4000 if (os::stat(hotspotrc, &buf) == 0) {
4001 needs_hotspotrc_warning = true;
4002 }
4003 #endif
4004 }
4005
4006 if (PrintVMOptions) {
4007 print_options(java_tool_options_args.get());
4008 print_options(args);
4009 print_options(java_options_args.get());
4010 }
4011
4012 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4013 jint result = parse_vm_init_args(java_tool_options_args.get(),
4014 java_options_args.get(),
4015 args); // command line arguments
4016
4017 if (result != JNI_OK) {
4018 return result;
4019 }
4020
4021 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4022 SharedArchivePath = get_shared_archive_path();
4023 if (SharedArchivePath == NULL) {
4024 return JNI_ENOMEM;
4025 }
4026
4027 // Set up VerifySharedSpaces
4028 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4029 VerifySharedSpaces = true;
4030 }
4031
4032 // Delay warning until here so that we've had a chance to process
4033 // the -XX:-PrintWarnings flag
4034 if (needs_hotspotrc_warning) {
4035 warning("%s file is present but has been ignored. "
4036 "Run with -XX:Flags=%s to load the file.",
4037 hotspotrc, hotspotrc);
4038 }
4039
4040 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4041 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4042 #endif
4043
4044 ArgumentsExt::report_unsupported_options();
4045
4046 #ifndef PRODUCT
4047 if (TraceBytecodesAt != 0) {
4048 TraceBytecodes = true;
4049 }
4050 if (CountCompiledCalls) {
4051 if (UseCounterDecay) {
4052 warning("UseCounterDecay disabled because CountCalls is set");
4053 UseCounterDecay = false;
4054 }
4055 }
4056 #endif // PRODUCT
4057
4058 if (ScavengeRootsInCode == 0) {
4059 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4060 warning("Forcing ScavengeRootsInCode non-zero");
4061 }
4062 ScavengeRootsInCode = 1;
4063 }
4064
4065 // Set object alignment values.
4066 set_object_alignment();
4067
4068 #if !INCLUDE_ALL_GCS
4069 force_serial_gc();
4070 #endif // INCLUDE_ALL_GCS
4071 #if !INCLUDE_CDS
4072 if (DumpSharedSpaces || RequireSharedSpaces) {
4073 jio_fprintf(defaultStream::error_stream(),
4074 "Shared spaces are not supported in this VM\n");
4075 return JNI_ERR;
4076 }
4077 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4078 warning("Shared spaces are not supported in this VM");
4079 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4080 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4081 }
4082 no_shared_spaces("CDS Disabled");
4083 #endif // INCLUDE_CDS
4084
4085 return JNI_OK;
4086 }
4087
4088 jint Arguments::apply_ergo() {
4089
4090 // Set flags based on ergonomics.
4091 set_ergonomics_flags();
4092
4093 set_shared_spaces_flags();
4094
4095 // Check the GC selections again.
4096 if (!check_gc_consistency()) {
4097 return JNI_EINVAL;
4098 }
4099
4100 if (TieredCompilation) {
4101 set_tiered_flags();
4102 } else {
4103 int max_compilation_policy_choice = 1;
4104 #ifdef COMPILER2
4105 max_compilation_policy_choice = 2;
4106 #endif
4107 // Check if the policy is valid.
4108 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4109 vm_exit_during_initialization(
4110 "Incompatible compilation policy selected", NULL);
4111 }
4112 // Scale CompileThreshold
4113 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4114 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4115 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4116 }
4117 }
4118
4119 #ifdef COMPILER2
4120 #ifndef PRODUCT
4121 if (PrintIdealGraphLevel > 0) {
4122 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4123 }
4124 #endif
4125 #endif
4126
4127 // Set heap size based on available physical memory
4128 set_heap_size();
4129
4130 ArgumentsExt::set_gc_specific_flags();
4131
4132 // Initialize Metaspace flags and alignments
4133 Metaspace::ergo_initialize();
4134
4135 // Set bytecode rewriting flags
4136 set_bytecode_flags();
4137
4138 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4139 jint code = set_aggressive_opts_flags();
4140 if (code != JNI_OK) {
4141 return code;
4142 }
4143
4144 // Turn off biased locking for locking debug mode flags,
4145 // which are subtly different from each other but neither works with
4146 // biased locking
4147 if (UseHeavyMonitors
4148 #ifdef COMPILER1
4149 || !UseFastLocking
4150 #endif // COMPILER1
4151 #if INCLUDE_JVMCI
4152 || !JVMCIUseFastLocking
4153 #endif
4154 ) {
4155 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4156 // flag set to true on command line; warn the user that they
4157 // can't enable biased locking here
4158 warning("Biased Locking is not supported with locking debug flags"
4159 "; ignoring UseBiasedLocking flag." );
4160 }
4161 UseBiasedLocking = false;
4162 }
4163
4164 #ifdef ZERO
4165 // Clear flags not supported on zero.
4166 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4167 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4168 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4169 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4170 #endif // CC_INTERP
4171
4172 #ifdef COMPILER2
4173 if (!EliminateLocks) {
4174 EliminateNestedLocks = false;
4175 }
4176 if (!Inline) {
4177 IncrementalInline = false;
4178 }
4179 #ifndef PRODUCT
4180 if (!IncrementalInline) {
4181 AlwaysIncrementalInline = false;
4182 }
4183 #endif
4184 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4185 // nothing to use the profiling, turn if off
4186 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4187 }
4188 #endif
4189
4190 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4191 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4192 DebugNonSafepoints = true;
4193 }
4194
4195 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4196 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4197 }
4198
4199 #ifndef PRODUCT
4200 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4201 if (use_vm_log()) {
4202 LogVMOutput = true;
4203 }
4204 }
4205 #endif // PRODUCT
4206
4207 if (PrintCommandLineFlags) {
4208 CommandLineFlags::printSetFlags(tty);
4209 }
4210
4211 // Apply CPU specific policy for the BiasedLocking
4212 if (UseBiasedLocking) {
4213 if (!VM_Version::use_biased_locking() &&
4214 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4215 UseBiasedLocking = false;
4216 }
4217 }
4218 #ifdef COMPILER2
4219 if (!UseBiasedLocking || EmitSync != 0) {
4220 UseOptoBiasInlining = false;
4221 }
4222 #endif
4223
4224 return JNI_OK;
4225 }
4226
4227 jint Arguments::adjust_after_os() {
4228 if (UseNUMA) {
4229 if (UseParallelGC || UseParallelOldGC) {
4230 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4231 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4232 }
4233 }
4234 // UseNUMAInterleaving is set to ON for all collectors and
4235 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4236 // such as the parallel collector for Linux and Solaris will
4237 // interleave old gen and survivor spaces on top of NUMA
4238 // allocation policy for the eden space.
4239 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4240 // all platforms and ParallelGC on Windows will interleave all
4241 // of the heap spaces across NUMA nodes.
4242 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4243 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4244 }
4245 }
4246 return JNI_OK;
4247 }
4248
4249 int Arguments::PropertyList_count(SystemProperty* pl) {
4250 int count = 0;
4251 while(pl != NULL) {
4252 count++;
4253 pl = pl->next();
4254 }
4255 return count;
4256 }
4257
4258 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4259 assert(key != NULL, "just checking");
4260 SystemProperty* prop;
4261 for (prop = pl; prop != NULL; prop = prop->next()) {
4262 if (strcmp(key, prop->key()) == 0) return prop->value();
4263 }
4264 return NULL;
4265 }
4266
4267 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4268 int count = 0;
4269 const char* ret_val = NULL;
4270
4271 while(pl != NULL) {
4272 if(count >= index) {
4273 ret_val = pl->key();
4274 break;
4275 }
4276 count++;
4277 pl = pl->next();
4278 }
4279
4280 return ret_val;
4281 }
4282
4283 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4284 int count = 0;
4285 char* ret_val = NULL;
4286
4287 while(pl != NULL) {
4288 if(count >= index) {
4289 ret_val = pl->value();
4290 break;
4291 }
4292 count++;
4293 pl = pl->next();
4294 }
4295
4296 return ret_val;
4297 }
4298
4299 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4300 SystemProperty* p = *plist;
4301 if (p == NULL) {
4302 *plist = new_p;
4303 } else {
4304 while (p->next() != NULL) {
4305 p = p->next();
4306 }
4307 p->set_next(new_p);
4308 }
4309 }
4310
4311 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4312 if (plist == NULL)
4313 return;
4314
4315 SystemProperty* new_p = new SystemProperty(k, v, true);
4316 PropertyList_add(plist, new_p);
4317 }
4318
4319 void Arguments::PropertyList_add(SystemProperty *element) {
4320 PropertyList_add(&_system_properties, element);
4321 }
4322
4323 // This add maintains unique property key in the list.
4324 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4325 if (plist == NULL)
4326 return;
4327
4328 // If property key exist then update with new value.
4329 SystemProperty* prop;
4330 for (prop = *plist; prop != NULL; prop = prop->next()) {
4331 if (strcmp(k, prop->key()) == 0) {
4332 if (append) {
4333 prop->append_value(v);
4334 } else {
4335 prop->set_value(v);
4336 }
4337 return;
4338 }
4339 }
4340
4341 PropertyList_add(plist, k, v);
4342 }
4343
4344 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4345 // Returns true if all of the source pointed by src has been copied over to
4346 // the destination buffer pointed by buf. Otherwise, returns false.
4347 // Notes:
4348 // 1. If the length (buflen) of the destination buffer excluding the
4349 // NULL terminator character is not long enough for holding the expanded
4350 // pid characters, it also returns false instead of returning the partially
4351 // expanded one.
4352 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4353 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4354 char* buf, size_t buflen) {
4355 const char* p = src;
4356 char* b = buf;
4357 const char* src_end = &src[srclen];
4358 char* buf_end = &buf[buflen - 1];
4359
4360 while (p < src_end && b < buf_end) {
4361 if (*p == '%') {
4362 switch (*(++p)) {
4363 case '%': // "%%" ==> "%"
4364 *b++ = *p++;
4365 break;
4366 case 'p': { // "%p" ==> current process id
4367 // buf_end points to the character before the last character so
4368 // that we could write '\0' to the end of the buffer.
4369 size_t buf_sz = buf_end - b + 1;
4370 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4371
4372 // if jio_snprintf fails or the buffer is not long enough to hold
4373 // the expanded pid, returns false.
4374 if (ret < 0 || ret >= (int)buf_sz) {
4375 return false;
4376 } else {
4377 b += ret;
4378 assert(*b == '\0', "fail in copy_expand_pid");
4379 if (p == src_end && b == buf_end + 1) {
4380 // reach the end of the buffer.
4381 return true;
4382 }
4383 }
4384 p++;
4385 break;
4386 }
4387 default :
4388 *b++ = '%';
4389 }
4390 } else {
4391 *b++ = *p++;
4392 }
4393 }
4394 *b = '\0';
4395 return (p == src_end); // return false if not all of the source was copied
4396 }