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