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/logConfiguration.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/arguments_ext.hpp"
42 #include "runtime/commandLineFlagConstraintList.hpp"
43 #include "runtime/commandLineFlagRangeList.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/globals_extension.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/os.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "services/management.hpp"
50 #include "services/memTracker.hpp"
51 #include "utilities/defaultStream.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/stringUtils.hpp"
54 #if INCLUDE_JVMCI
55 #include "jvmci/jvmciRuntime.hpp"
56 #endif
57 #if INCLUDE_ALL_GCS
58 #include "gc/cms/compactibleFreeListSpace.hpp"
59 #include "gc/g1/g1CollectedHeap.inline.hpp"
60 #include "gc/parallel/parallelScavengeHeap.hpp"
61 #endif // INCLUDE_ALL_GCS
62
63 // Note: This is a special bug reporting site for the JVM
64 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
65 #define DEFAULT_JAVA_LAUNCHER "generic"
66
67 #define UNSUPPORTED_GC_OPTION(gc) \
68 do { \
69 if (gc) { \
70 if (FLAG_IS_CMDLINE(gc)) { \
71 warning(#gc " is not supported in this VM. Using Serial GC."); \
72 } \
73 FLAG_SET_DEFAULT(gc, false); \
74 } \
75 } while(0)
76
77 char* Arguments::_jvm_flags_file = NULL;
78 char** Arguments::_jvm_flags_array = NULL;
79 int Arguments::_num_jvm_flags = 0;
80 char** Arguments::_jvm_args_array = NULL;
81 int Arguments::_num_jvm_args = 0;
82 char* Arguments::_java_command = NULL;
83 SystemProperty* Arguments::_system_properties = NULL;
84 const char* Arguments::_gc_log_filename = NULL;
85 bool Arguments::_has_profile = false;
86 size_t Arguments::_conservative_max_heap_alignment = 0;
87 size_t Arguments::_min_heap_size = 0;
88 Arguments::Mode Arguments::_mode = _mixed;
89 bool Arguments::_java_compiler = false;
90 bool Arguments::_xdebug_mode = false;
91 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
92 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
93 int Arguments::_sun_java_launcher_pid = -1;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
102 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
103
104 char* Arguments::SharedArchivePath = NULL;
105
106 AgentLibraryList Arguments::_libraryList;
107 AgentLibraryList Arguments::_agentList;
108
109 abort_hook_t Arguments::_abort_hook = NULL;
110 exit_hook_t Arguments::_exit_hook = NULL;
111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = NULL;
115 SystemProperty *Arguments::_java_library_path = NULL;
116 SystemProperty *Arguments::_java_home = NULL;
117 SystemProperty *Arguments::_java_class_path = NULL;
118 SystemProperty *Arguments::_sun_boot_class_path = NULL;
119
120 char* Arguments::_ext_dirs = NULL;
121
122 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
123 // part of the option string.
124 static bool match_option(const JavaVMOption *option, const char* name,
125 const char** tail) {
126 size_t len = strlen(name);
127 if (strncmp(option->optionString, name, len) == 0) {
128 *tail = option->optionString + len;
129 return true;
130 } else {
131 return false;
132 }
133 }
134
135 // Check if 'option' matches 'name'. No "tail" is allowed.
136 static bool match_option(const JavaVMOption *option, const char* name) {
137 const char* tail = NULL;
138 bool result = match_option(option, name, &tail);
139 if (tail != NULL && *tail == '\0') {
140 return result;
141 } else {
142 return false;
143 }
144 }
145
146 // Return true if any of the strings in null-terminated array 'names' matches.
147 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
148 // the option must match exactly.
149 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
150 bool tail_allowed) {
151 for (/* empty */; *names != NULL; ++names) {
152 if (match_option(option, *names, tail)) {
153 if (**tail == '\0' || tail_allowed && **tail == ':') {
154 return true;
155 }
156 }
157 }
158 return false;
159 }
160
161 static void logOption(const char* opt) {
162 if (PrintVMOptions) {
163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
164 }
165 }
166
167 // Process java launcher properties.
168 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
169 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
170 // sun.java.launcher.pid is defined.
171 // Must do this before setting up other system properties,
172 // as some of them may depend on launcher type.
173 for (int index = 0; index < args->nOptions; index++) {
174 const JavaVMOption* option = args->options + index;
175 const char* tail;
176
177 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
178 process_java_launcher_argument(tail, option->extraInfo);
179 continue;
180 }
181 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
182 if (strcmp(tail, "true") == 0) {
183 _sun_java_launcher_is_altjvm = true;
184 }
185 continue;
186 }
187 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
188 _sun_java_launcher_pid = atoi(tail);
189 continue;
190 }
191 }
192 }
193
194 // Initialize system properties key and value.
195 void Arguments::init_system_properties() {
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
197 "Java Virtual Machine Specification", false));
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
201 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
202
203 // Following are JVMTI agent writable properties.
204 // Properties values are set to NULL and they are
205 // os specific they are initialized in os::init_system_properties_values().
206 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
207 _java_library_path = new SystemProperty("java.library.path", NULL, true);
208 _java_home = new SystemProperty("java.home", NULL, true);
209 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
210
211 _java_class_path = new SystemProperty("java.class.path", "", true);
212
213 // Add to System Property list.
214 PropertyList_add(&_system_properties, _sun_boot_library_path);
215 PropertyList_add(&_system_properties, _java_library_path);
216 PropertyList_add(&_system_properties, _java_home);
217 PropertyList_add(&_system_properties, _java_class_path);
218 PropertyList_add(&_system_properties, _sun_boot_class_path);
219
220 // Set OS specific system properties values
221 os::init_system_properties_values();
222
223 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
224 }
225
226 // Update/Initialize System properties after JDK version number is known
227 void Arguments::init_version_specific_system_properties() {
228 enum { bufsz = 16 };
229 char buffer[bufsz];
230 const char* spec_vendor = "Oracle Corporation";
231 uint32_t spec_version = JDK_Version::current().major_version();
232
233 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
234
235 PropertyList_add(&_system_properties,
236 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
237 PropertyList_add(&_system_properties,
238 new SystemProperty("java.vm.specification.version", buffer, false));
239 PropertyList_add(&_system_properties,
240 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
241 }
242
243 /*
244 * -XX argument processing:
245 *
246 * -XX arguments are defined in several places, such as:
247 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
248 * -XX arguments are parsed in parse_argument().
249 * -XX argument bounds checking is done in check_vm_args_consistency().
250 *
251 * Over time -XX arguments may change. There are mechanisms to handle common cases:
252 *
253 * ALIASED: An option that is simply another name for another option. This is often
254 * part of the process of deprecating a flag, but not all aliases need
255 * to be deprecated.
256 *
257 * Create an alias for an option by adding the old and new option names to the
258 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
259 *
260 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
261 * support may be removed in the future. Both regular and aliased options may be
262 * deprecated.
263 *
264 * Add a deprecation warning for an option (or alias) by adding an entry in the
265 * "special_jvm_flags" table and setting the "deprecated_in" field.
266 * Often an option "deprecated" in one major release will
267 * be made "obsolete" in the next. In this case the entry should also have it's
268 * "obsolete_in" field set.
269 *
270 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
271 * on the command line. A warning is printed to let the user know that option might not
272 * be accepted in the future.
273 *
274 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
275 * table and setting the "obsolete_in" field.
276 *
277 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
278 * to the current JDK version. The system will flatly refuse to admit the existence of
279 * the flag. This allows a flag to die automatically over JDK releases.
280 *
281 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
282 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
283 * - Newly obsolete or expired deprecated options should have their global variable
284 * definitions removed (from globals.hpp, etc) and related implementations removed.
285 *
286 * Recommended approach for removing options:
287 *
288 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
289 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
290 *
291 * To remove internal options (e.g. diagnostic, experimental, develop options), use
292 * a 2-step model adding major release numbers to the obsolete and expire columns.
293 *
294 * To change the name of an option, use the alias table as well as a 2-step
295 * model adding major release numbers to the deprecate and expire columns.
296 * Think twice about aliasing commonly used customer options.
297 *
298 * There are times when it is appropriate to leave a future release number as undefined.
299 *
300 * Tests: Aliases should be tested in VMAliasOptions.java.
301 * Deprecated options should be tested in VMDeprecatedOptions.java.
302 */
303
304 // Obsolete or deprecated -XX flag.
305 typedef struct {
306 const char* name;
307 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
308 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
309 JDK_Version expired_in; // When the option expires (or "undefined").
310 } SpecialFlag;
311
312 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
313 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
314 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
315 // the command-line as usual, but will issue a warning.
316 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
317 // the command-line, while issuing a warning and ignoring the flag value.
318 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
319 // existence of the flag.
320 //
321 // MANUAL CLEANUP ON JDK VERSION UPDATES:
322 // This table ensures that the handling of options will update automatically when the JDK
323 // version is incremented, but the source code needs to be cleanup up manually:
324 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
325 // variable should be removed, as well as users of the variable.
326 // - As "deprecated" options age into "obsolete" options, move the entry into the
327 // "Obsolete Flags" section of the table.
328 // - All expired options should be removed from the table.
329 static SpecialFlag const special_jvm_flags[] = {
330 // -------------- Deprecated Flags --------------
331 // --- Non-alias flags - sorted by obsolete_in then expired_in:
332 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
333 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
334
335 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
336 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
337 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
338 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
339 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
340 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
341 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
342 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
343
344 // -------------- Obsolete Flags - sorted by expired_in --------------
345 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
346 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
347 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
348 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
349 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 #ifndef ZERO
359 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 #endif // ZERO
362 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371
372 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
373 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
374 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
375 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
376 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
377 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
378 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
379 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
380 #endif
381
382 { NULL, JDK_Version(0), JDK_Version(0) }
383 };
384
385 // Flags that are aliases for other flags.
386 typedef struct {
387 const char* alias_name;
388 const char* real_name;
389 } AliasedFlag;
390
391 static AliasedFlag const aliased_jvm_flags[] = {
392 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
393 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
394 { "CMSMarkStackSize", "MarkStackSize" },
395 { "G1MarkStackSize", "MarkStackSize" },
396 { "ParallelMarkingThreads", "ConcGCThreads" },
397 { "ParallelCMSThreads", "ConcGCThreads" },
398 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
399 { NULL, NULL}
400 };
401
402 // Return true if "v" is less than "other", where "other" may be "undefined".
403 static bool version_less_than(JDK_Version v, JDK_Version other) {
404 assert(!v.is_undefined(), "must be defined");
405 if (!other.is_undefined() && v.compare(other) >= 0) {
406 return false;
407 } else {
408 return true;
409 }
410 }
411
412 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
413 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
414 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
415 flag = special_jvm_flags[i];
416 return true;
417 }
418 }
419 return false;
420 }
421
422 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
423 assert(version != NULL, "Must provide a version buffer");
424 SpecialFlag flag;
425 if (lookup_special_flag(flag_name, flag)) {
426 if (!flag.obsolete_in.is_undefined()) {
427 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
428 *version = flag.obsolete_in;
429 return true;
430 }
431 }
432 }
433 return false;
434 }
435
436 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
437 assert(version != NULL, "Must provide a version buffer");
438 SpecialFlag flag;
439 if (lookup_special_flag(flag_name, flag)) {
440 if (!flag.deprecated_in.is_undefined()) {
441 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
442 version_less_than(JDK_Version::current(), flag.expired_in)) {
443 *version = flag.deprecated_in;
444 return 1;
445 } else {
446 return -1;
447 }
448 }
449 }
450 return 0;
451 }
452
453 const char* Arguments::real_flag_name(const char *flag_name) {
454 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
455 const AliasedFlag& flag_status = aliased_jvm_flags[i];
456 if (strcmp(flag_status.alias_name, flag_name) == 0) {
457 return flag_status.real_name;
458 }
459 }
460 return flag_name;
461 }
462
463 #ifdef ASSERT
464 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
465 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
466 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
467 return true;
468 }
469 }
470 return false;
471 }
472
473 static bool verify_special_jvm_flags() {
474 bool success = true;
475 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
476 const SpecialFlag& flag = special_jvm_flags[i];
477 if (lookup_special_flag(flag.name, i)) {
478 warning("Duplicate special flag declaration \"%s\"", flag.name);
479 success = false;
480 }
481 if (flag.deprecated_in.is_undefined() &&
482 flag.obsolete_in.is_undefined()) {
483 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
484 success = false;
485 }
486
487 if (!flag.deprecated_in.is_undefined()) {
488 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
489 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
490 success = false;
491 }
492
493 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
494 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
495 success = false;
496 }
497 }
498
499 if (!flag.obsolete_in.is_undefined()) {
500 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
501 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
502 success = false;
503 }
504
505 // if flag has become obsolete it should not have a "globals" flag defined anymore.
506 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
507 if (Flag::find_flag(flag.name) != NULL) {
508 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
509 success = false;
510 }
511 }
512 }
513
514 if (!flag.expired_in.is_undefined()) {
515 // if flag has become expired it should not have a "globals" flag defined anymore.
516 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
517 if (Flag::find_flag(flag.name) != NULL) {
518 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
519 success = false;
520 }
521 }
522 }
523
524 }
525 return success;
526 }
527 #endif
528
529 // Constructs the system class path (aka boot class path) from the following
530 // components, in order:
531 //
532 // prefix // from -Xbootclasspath/p:...
533 // base // from os::get_system_properties() or -Xbootclasspath=
534 // suffix // from -Xbootclasspath/a:...
535 //
536 // This could be AllStatic, but it isn't needed after argument processing is
537 // complete.
538 class SysClassPath: public StackObj {
539 public:
540 SysClassPath(const char* base);
541 ~SysClassPath();
542
543 inline void set_base(const char* base);
544 inline void add_prefix(const char* prefix);
545 inline void add_suffix_to_prefix(const char* suffix);
546 inline void add_suffix(const char* suffix);
547 inline void reset_path(const char* base);
548
549 inline const char* get_base() const { return _items[_scp_base]; }
550 inline const char* get_prefix() const { return _items[_scp_prefix]; }
551 inline const char* get_suffix() const { return _items[_scp_suffix]; }
552
553 // Combine all the components into a single c-heap-allocated string; caller
554 // must free the string if/when no longer needed.
555 char* combined_path();
556
557 private:
558 // Utility routines.
559 static char* add_to_path(const char* path, const char* str, bool prepend);
560 static char* add_jars_to_path(char* path, const char* directory);
561
562 inline void reset_item_at(int index);
563
564 // Array indices for the items that make up the sysclasspath. All except the
565 // base are allocated in the C heap and freed by this class.
566 enum {
567 _scp_prefix, // from -Xbootclasspath/p:...
568 _scp_base, // the default sysclasspath
569 _scp_suffix, // from -Xbootclasspath/a:...
570 _scp_nitems // the number of items, must be last.
571 };
572
573 const char* _items[_scp_nitems];
574 };
575
576 SysClassPath::SysClassPath(const char* base) {
577 memset(_items, 0, sizeof(_items));
578 _items[_scp_base] = base;
579 }
580
581 SysClassPath::~SysClassPath() {
582 // Free everything except the base.
583 for (int i = 0; i < _scp_nitems; ++i) {
584 if (i != _scp_base) reset_item_at(i);
585 }
586 }
587
588 inline void SysClassPath::set_base(const char* base) {
589 _items[_scp_base] = base;
590 }
591
592 inline void SysClassPath::add_prefix(const char* prefix) {
593 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
594 }
595
596 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
597 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
598 }
599
600 inline void SysClassPath::add_suffix(const char* suffix) {
601 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
602 }
603
604 inline void SysClassPath::reset_item_at(int index) {
605 assert(index < _scp_nitems && index != _scp_base, "just checking");
606 if (_items[index] != NULL) {
607 FREE_C_HEAP_ARRAY(char, _items[index]);
608 _items[index] = NULL;
609 }
610 }
611
612 inline void SysClassPath::reset_path(const char* base) {
613 // Clear the prefix and suffix.
614 reset_item_at(_scp_prefix);
615 reset_item_at(_scp_suffix);
616 set_base(base);
617 }
618
619 //------------------------------------------------------------------------------
620
621
622 // Combine the bootclasspath elements, some of which may be null, into a single
623 // c-heap-allocated string.
624 char* SysClassPath::combined_path() {
625 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
626
627 size_t lengths[_scp_nitems];
628 size_t total_len = 0;
629
630 const char separator = *os::path_separator();
631
632 // Get the lengths.
633 int i;
634 for (i = 0; i < _scp_nitems; ++i) {
635 if (_items[i] != NULL) {
636 lengths[i] = strlen(_items[i]);
637 // Include space for the separator char (or a NULL for the last item).
638 total_len += lengths[i] + 1;
639 }
640 }
641 assert(total_len > 0, "empty sysclasspath not allowed");
642
643 // Copy the _items to a single string.
644 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
645 char* cp_tmp = cp;
646 for (i = 0; i < _scp_nitems; ++i) {
647 if (_items[i] != NULL) {
648 memcpy(cp_tmp, _items[i], lengths[i]);
649 cp_tmp += lengths[i];
650 *cp_tmp++ = separator;
651 }
652 }
653 *--cp_tmp = '\0'; // Replace the extra separator.
654 return cp;
655 }
656
657 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
658 char*
659 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
660 char *cp;
661
662 assert(str != NULL, "just checking");
663 if (path == NULL) {
664 size_t len = strlen(str) + 1;
665 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
666 memcpy(cp, str, len); // copy the trailing null
667 } else {
668 const char separator = *os::path_separator();
669 size_t old_len = strlen(path);
670 size_t str_len = strlen(str);
671 size_t len = old_len + str_len + 2;
672
673 if (prepend) {
674 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
675 char* cp_tmp = cp;
676 memcpy(cp_tmp, str, str_len);
677 cp_tmp += str_len;
678 *cp_tmp = separator;
679 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
680 FREE_C_HEAP_ARRAY(char, path);
681 } else {
682 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
683 char* cp_tmp = cp + old_len;
684 *cp_tmp = separator;
685 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
686 }
687 }
688 return cp;
689 }
690
691 // Scan the directory and append any jar or zip files found to path.
692 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
693 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
694 DIR* dir = os::opendir(directory);
695 if (dir == NULL) return path;
696
697 char dir_sep[2] = { '\0', '\0' };
698 size_t directory_len = strlen(directory);
699 const char fileSep = *os::file_separator();
700 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
701
702 /* Scan the directory for jars/zips, appending them to path. */
703 struct dirent *entry;
704 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
705 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
706 const char* name = entry->d_name;
707 const char* ext = name + strlen(name) - 4;
708 bool isJarOrZip = ext > name &&
709 (os::file_name_strcmp(ext, ".jar") == 0 ||
710 os::file_name_strcmp(ext, ".zip") == 0);
711 if (isJarOrZip) {
712 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
713 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
714 path = add_to_path(path, jarpath, false);
715 FREE_C_HEAP_ARRAY(char, jarpath);
716 }
717 }
718 FREE_C_HEAP_ARRAY(char, dbuf);
719 os::closedir(dir);
720 return path;
721 }
722
723 // Parses a memory size specification string.
724 static bool atomull(const char *s, julong* result) {
725 julong n = 0;
726 int args_read = 0;
727 bool is_hex = false;
728 // Skip leading 0[xX] for hexadecimal
729 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
730 s += 2;
731 is_hex = true;
732 args_read = sscanf(s, JULONG_FORMAT_X, &n);
733 } else {
734 args_read = sscanf(s, JULONG_FORMAT, &n);
735 }
736 if (args_read != 1) {
737 return false;
738 }
739 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
740 s++;
741 }
742 // 4705540: illegal if more characters are found after the first non-digit
743 if (strlen(s) > 1) {
744 return false;
745 }
746 switch (*s) {
747 case 'T': case 't':
748 *result = n * G * K;
749 // Check for overflow.
750 if (*result/((julong)G * K) != n) return false;
751 return true;
752 case 'G': case 'g':
753 *result = n * G;
754 if (*result/G != n) return false;
755 return true;
756 case 'M': case 'm':
757 *result = n * M;
758 if (*result/M != n) return false;
759 return true;
760 case 'K': case 'k':
761 *result = n * K;
762 if (*result/K != n) return false;
763 return true;
764 case '\0':
765 *result = n;
766 return true;
767 default:
768 return false;
769 }
770 }
771
772 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
773 if (size < min_size) return arg_too_small;
774 // Check that size will fit in a size_t (only relevant on 32-bit)
775 if (size > max_uintx) return arg_too_big;
776 return arg_in_range;
777 }
778
779 // Describe an argument out of range error
780 void Arguments::describe_range_error(ArgsRange errcode) {
781 switch(errcode) {
782 case arg_too_big:
783 jio_fprintf(defaultStream::error_stream(),
784 "The specified size exceeds the maximum "
785 "representable size.\n");
786 break;
787 case arg_too_small:
788 case arg_unreadable:
789 case arg_in_range:
790 // do nothing for now
791 break;
792 default:
793 ShouldNotReachHere();
794 }
795 }
796
797 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
798 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
799 return true;
800 } else {
801 return false;
802 }
803 }
804
805 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
806 char* end;
807 errno = 0;
808 double v = strtod(value, &end);
809 if ((errno != 0) || (*end != 0)) {
810 return false;
811 }
812
813 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
814 return true;
815 }
816 return false;
817 }
818
819 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
820 julong v;
821 int int_v;
822 intx intx_v;
823 bool is_neg = false;
824 Flag* result = Flag::find_flag(name, strlen(name));
825
826 if (result == NULL) {
827 return false;
828 }
829
830 // Check the sign first since atomull() parses only unsigned values.
831 if (*value == '-') {
832 if (!result->is_intx() && !result->is_int()) {
833 return false;
834 }
835 value++;
836 is_neg = true;
837 }
838 if (!atomull(value, &v)) {
839 return false;
840 }
841 if (result->is_int()) {
842 int_v = (int) v;
843 if (is_neg) {
844 int_v = -int_v;
845 }
846 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
847 } else if (result->is_uint()) {
848 uint uint_v = (uint) v;
849 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
850 } else if (result->is_intx()) {
851 intx_v = (intx) v;
852 if (is_neg) {
853 intx_v = -intx_v;
854 }
855 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
856 } else if (result->is_uintx()) {
857 uintx uintx_v = (uintx) v;
858 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
859 } else if (result->is_uint64_t()) {
860 uint64_t uint64_t_v = (uint64_t) v;
861 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
862 } else if (result->is_size_t()) {
863 size_t size_t_v = (size_t) v;
864 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
865 } else {
866 return false;
867 }
868 }
869
870 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
871 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
872 // Contract: CommandLineFlags always returns a pointer that needs freeing.
873 FREE_C_HEAP_ARRAY(char, value);
874 return true;
875 }
876
877 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
878 const char* old_value = "";
879 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
880 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
881 size_t new_len = strlen(new_value);
882 const char* value;
883 char* free_this_too = NULL;
884 if (old_len == 0) {
885 value = new_value;
886 } else if (new_len == 0) {
887 value = old_value;
888 } else {
889 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
890 // each new setting adds another LINE to the switch:
891 sprintf(buf, "%s\n%s", old_value, new_value);
892 value = buf;
893 free_this_too = buf;
894 }
895 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
896 // CommandLineFlags always returns a pointer that needs freeing.
897 FREE_C_HEAP_ARRAY(char, value);
898 if (free_this_too != NULL) {
899 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
900 FREE_C_HEAP_ARRAY(char, free_this_too);
901 }
902 return true;
903 }
904
905 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
906 const char* real_name = real_flag_name(arg);
907 JDK_Version since = JDK_Version();
908 switch (is_deprecated_flag(arg, &since)) {
909 case -1:
910 return NULL; // obsolete or expired, don't process normally
911 case 0:
912 return real_name;
913 case 1: {
914 if (warn) {
915 char version[256];
916 since.to_string(version, sizeof(version));
917 if (real_name != arg) {
918 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
919 arg, version, real_name);
920 } else {
921 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
922 arg, version);
923 }
924 }
925 return real_name;
926 }
927 }
928 ShouldNotReachHere();
929 return NULL;
930 }
931
932 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
933
934 // range of acceptable characters spelled out for portability reasons
935 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
936 #define BUFLEN 255
937 char name[BUFLEN+1];
938 char dummy;
939 const char* real_name;
940 bool warn_if_deprecated = true;
941
942 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
943 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
944 if (real_name == NULL) {
945 return false;
946 }
947 return set_bool_flag(real_name, false, origin);
948 }
949 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
950 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
951 if (real_name == NULL) {
952 return false;
953 }
954 return set_bool_flag(real_name, true, origin);
955 }
956
957 char punct;
958 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
959 const char* value = strchr(arg, '=') + 1;
960 Flag* flag;
961
962 // this scanf pattern matches both strings (handled here) and numbers (handled later))
963 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
964 if (real_name == NULL) {
965 return false;
966 }
967 flag = Flag::find_flag(real_name);
968 if (flag != NULL && flag->is_ccstr()) {
969 if (flag->ccstr_accumulates()) {
970 return append_to_string_flag(real_name, value, origin);
971 } else {
972 if (value[0] == '\0') {
973 value = NULL;
974 }
975 return set_string_flag(real_name, value, origin);
976 }
977 } else {
978 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
979 }
980 }
981
982 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
983 const char* value = strchr(arg, '=') + 1;
984 // -XX:Foo:=xxx will reset the string flag to the given value.
985 if (value[0] == '\0') {
986 value = NULL;
987 }
988 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
989 if (real_name == NULL) {
990 return false;
991 }
992 return set_string_flag(real_name, value, origin);
993 }
994
995 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
996 #define SIGNED_NUMBER_RANGE "[-0123456789]"
997 #define NUMBER_RANGE "[0123456789eE+-]"
998 char value[BUFLEN + 1];
999 char value2[BUFLEN + 1];
1000 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1001 // Looks like a floating-point number -- try again with more lenient format string
1002 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1003 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1004 if (real_name == NULL) {
1005 return false;
1006 }
1007 return set_fp_numeric_flag(real_name, value, origin);
1008 }
1009 }
1010
1011 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1012 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1013 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1014 if (real_name == NULL) {
1015 return false;
1016 }
1017 return set_numeric_flag(real_name, value, origin);
1018 }
1019
1020 return false;
1021 }
1022
1023 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1024 assert(bldarray != NULL, "illegal argument");
1025
1026 if (arg == NULL) {
1027 return;
1028 }
1029
1030 int new_count = *count + 1;
1031
1032 // expand the array and add arg to the last element
1033 if (*bldarray == NULL) {
1034 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1035 } else {
1036 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1037 }
1038 (*bldarray)[*count] = os::strdup_check_oom(arg);
1039 *count = new_count;
1040 }
1041
1042 void Arguments::build_jvm_args(const char* arg) {
1043 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1044 }
1045
1046 void Arguments::build_jvm_flags(const char* arg) {
1047 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1048 }
1049
1050 // utility function to return a string that concatenates all
1051 // strings in a given char** array
1052 const char* Arguments::build_resource_string(char** args, int count) {
1053 if (args == NULL || count == 0) {
1054 return NULL;
1055 }
1056 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1057 for (int i = 1; i < count; i++) {
1058 length += strlen(args[i]) + 1; // add 1 for a space
1059 }
1060 char* s = NEW_RESOURCE_ARRAY(char, length);
1061 strcpy(s, args[0]);
1062 for (int j = 1; j < count; j++) {
1063 strcat(s, " ");
1064 strcat(s, args[j]);
1065 }
1066 return (const char*) s;
1067 }
1068
1069 void Arguments::print_on(outputStream* st) {
1070 st->print_cr("VM Arguments:");
1071 if (num_jvm_flags() > 0) {
1072 st->print("jvm_flags: "); print_jvm_flags_on(st);
1073 st->cr();
1074 }
1075 if (num_jvm_args() > 0) {
1076 st->print("jvm_args: "); print_jvm_args_on(st);
1077 st->cr();
1078 }
1079 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1080 if (_java_class_path != NULL) {
1081 char* path = _java_class_path->value();
1082 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1083 }
1084 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1085 }
1086
1087 void Arguments::print_summary_on(outputStream* st) {
1088 // Print the command line. Environment variables that are helpful for
1089 // reproducing the problem are written later in the hs_err file.
1090 // flags are from setting file
1091 if (num_jvm_flags() > 0) {
1092 st->print_raw("Settings File: ");
1093 print_jvm_flags_on(st);
1094 st->cr();
1095 }
1096 // args are the command line and environment variable arguments.
1097 st->print_raw("Command Line: ");
1098 if (num_jvm_args() > 0) {
1099 print_jvm_args_on(st);
1100 }
1101 // this is the classfile and any arguments to the java program
1102 if (java_command() != NULL) {
1103 st->print("%s", java_command());
1104 }
1105 st->cr();
1106 }
1107
1108 void Arguments::print_jvm_flags_on(outputStream* st) {
1109 if (_num_jvm_flags > 0) {
1110 for (int i=0; i < _num_jvm_flags; i++) {
1111 st->print("%s ", _jvm_flags_array[i]);
1112 }
1113 }
1114 }
1115
1116 void Arguments::print_jvm_args_on(outputStream* st) {
1117 if (_num_jvm_args > 0) {
1118 for (int i=0; i < _num_jvm_args; i++) {
1119 st->print("%s ", _jvm_args_array[i]);
1120 }
1121 }
1122 }
1123
1124 bool Arguments::process_argument(const char* arg,
1125 jboolean ignore_unrecognized,
1126 Flag::Flags origin) {
1127 JDK_Version since = JDK_Version();
1128
1129 if (parse_argument(arg, origin)) {
1130 return true;
1131 }
1132
1133 // Determine if the flag has '+', '-', or '=' characters.
1134 bool has_plus_minus = (*arg == '+' || *arg == '-');
1135 const char* const argname = has_plus_minus ? arg + 1 : arg;
1136
1137 size_t arg_len;
1138 const char* equal_sign = strchr(argname, '=');
1139 if (equal_sign == NULL) {
1140 arg_len = strlen(argname);
1141 } else {
1142 arg_len = equal_sign - argname;
1143 }
1144
1145 // Only make the obsolete check for valid arguments.
1146 if (arg_len <= BUFLEN) {
1147 // Construct a string which consists only of the argument name without '+', '-', or '='.
1148 char stripped_argname[BUFLEN+1];
1149 strncpy(stripped_argname, argname, arg_len);
1150 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1151
1152 if (is_obsolete_flag(stripped_argname, &since)) {
1153 char version[256];
1154 since.to_string(version, sizeof(version));
1155 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1156 return true;
1157 }
1158 }
1159
1160 // For locked flags, report a custom error message if available.
1161 // Otherwise, report the standard unrecognized VM option.
1162 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1163 if (found_flag != NULL) {
1164 char locked_message_buf[BUFLEN];
1165 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1166 if (strlen(locked_message_buf) == 0) {
1167 if (found_flag->is_bool() && !has_plus_minus) {
1168 jio_fprintf(defaultStream::error_stream(),
1169 "Missing +/- setting for VM option '%s'\n", argname);
1170 } else if (!found_flag->is_bool() && has_plus_minus) {
1171 jio_fprintf(defaultStream::error_stream(),
1172 "Unexpected +/- setting in VM option '%s'\n", argname);
1173 } else {
1174 jio_fprintf(defaultStream::error_stream(),
1175 "Improperly specified VM option '%s'\n", argname);
1176 }
1177 } else {
1178 #ifdef PRODUCT
1179 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1180 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1181 if (ignore_unrecognized && mismatched) {
1182 return true;
1183 }
1184 #endif
1185 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1186 }
1187 } else {
1188 if (ignore_unrecognized) {
1189 return true;
1190 }
1191 jio_fprintf(defaultStream::error_stream(),
1192 "Unrecognized VM option '%s'\n", argname);
1193 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1194 if (fuzzy_matched != NULL) {
1195 jio_fprintf(defaultStream::error_stream(),
1196 "Did you mean '%s%s%s'? ",
1197 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1198 fuzzy_matched->_name,
1199 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1200 }
1201 }
1202
1203 // allow for commandline "commenting out" options like -XX:#+Verbose
1204 return arg[0] == '#';
1205 }
1206
1207 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1208 FILE* stream = fopen(file_name, "rb");
1209 if (stream == NULL) {
1210 if (should_exist) {
1211 jio_fprintf(defaultStream::error_stream(),
1212 "Could not open settings file %s\n", file_name);
1213 return false;
1214 } else {
1215 return true;
1216 }
1217 }
1218
1219 char token[1024];
1220 int pos = 0;
1221
1222 bool in_white_space = true;
1223 bool in_comment = false;
1224 bool in_quote = false;
1225 char quote_c = 0;
1226 bool result = true;
1227
1228 int c = getc(stream);
1229 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1230 if (in_white_space) {
1231 if (in_comment) {
1232 if (c == '\n') in_comment = false;
1233 } else {
1234 if (c == '#') in_comment = true;
1235 else if (!isspace(c)) {
1236 in_white_space = false;
1237 token[pos++] = c;
1238 }
1239 }
1240 } else {
1241 if (c == '\n' || (!in_quote && isspace(c))) {
1242 // token ends at newline, or at unquoted whitespace
1243 // this allows a way to include spaces in string-valued options
1244 token[pos] = '\0';
1245 logOption(token);
1246 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1247 build_jvm_flags(token);
1248 pos = 0;
1249 in_white_space = true;
1250 in_quote = false;
1251 } else if (!in_quote && (c == '\'' || c == '"')) {
1252 in_quote = true;
1253 quote_c = c;
1254 } else if (in_quote && (c == quote_c)) {
1255 in_quote = false;
1256 } else {
1257 token[pos++] = c;
1258 }
1259 }
1260 c = getc(stream);
1261 }
1262 if (pos > 0) {
1263 token[pos] = '\0';
1264 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1265 build_jvm_flags(token);
1266 }
1267 fclose(stream);
1268 return result;
1269 }
1270
1271 //=============================================================================================================
1272 // Parsing of properties (-D)
1273
1274 const char* Arguments::get_property(const char* key) {
1275 return PropertyList_get_value(system_properties(), key);
1276 }
1277
1278 bool Arguments::add_property(const char* prop) {
1279 const char* eq = strchr(prop, '=');
1280 const char* key;
1281 const char* value = "";
1282
1283 if (eq == NULL) {
1284 // property doesn't have a value, thus use passed string
1285 key = prop;
1286 } else {
1287 // property have a value, thus extract it and save to the
1288 // allocated string
1289 size_t key_len = eq - prop;
1290 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1291
1292 strncpy(tmp_key, prop, key_len);
1293 tmp_key[key_len] = '\0';
1294 key = tmp_key;
1295
1296 value = &prop[key_len + 1];
1297 }
1298
1299 if (strcmp(key, "java.compiler") == 0) {
1300 process_java_compiler_argument(value);
1301 // Record value in Arguments, but let it get passed to Java.
1302 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1303 strcmp(key, "sun.java.launcher.pid") == 0) {
1304 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1305 // private and are processed in process_sun_java_launcher_properties();
1306 // the sun.java.launcher property is passed on to the java application
1307 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1308 PropertyList_unique_add(&_system_properties, key, value, true);
1309 } else {
1310 if (strcmp(key, "sun.java.command") == 0) {
1311 if (_java_command != NULL) {
1312 os::free(_java_command);
1313 }
1314 _java_command = os::strdup_check_oom(value, mtInternal);
1315 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1316 if (_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1317 assert(_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1318 os::free((void *)_java_vendor_url_bug);
1319 }
1320 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1321 // its value without going through the property list or making a Java call.
1322 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1323 }
1324
1325 // Create new property and add at the end of the list
1326 PropertyList_unique_add(&_system_properties, key, value);
1327 }
1328
1329 if (key != prop) {
1330 // SystemProperty copy passed value, thus free previously allocated
1331 // memory
1332 FreeHeap((void *)key);
1333 }
1334
1335 return true;
1336 }
1337
1338 //===========================================================================================================
1339 // Setting int/mixed/comp mode flags
1340
1341 void Arguments::set_mode_flags(Mode mode) {
1342 // Set up default values for all flags.
1343 // If you add a flag to any of the branches below,
1344 // add a default value for it here.
1345 set_java_compiler(false);
1346 _mode = mode;
1347
1348 // Ensure Agent_OnLoad has the correct initial values.
1349 // This may not be the final mode; mode may change later in onload phase.
1350 PropertyList_unique_add(&_system_properties, "java.vm.info",
1351 VM_Version::vm_info_string(), false);
1352
1353 UseInterpreter = true;
1354 UseCompiler = true;
1355 UseLoopCounter = true;
1356
1357 // Default values may be platform/compiler dependent -
1358 // use the saved values
1359 ClipInlining = Arguments::_ClipInlining;
1360 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1361 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1362 BackgroundCompilation = Arguments::_BackgroundCompilation;
1363 if (TieredCompilation) {
1364 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1365 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1366 }
1367 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1368 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1369 }
1370 }
1371
1372 // Change from defaults based on mode
1373 switch (mode) {
1374 default:
1375 ShouldNotReachHere();
1376 break;
1377 case _int:
1378 UseCompiler = false;
1379 UseLoopCounter = false;
1380 AlwaysCompileLoopMethods = false;
1381 UseOnStackReplacement = false;
1382 break;
1383 case _mixed:
1384 // same as default
1385 break;
1386 case _comp:
1387 UseInterpreter = false;
1388 BackgroundCompilation = false;
1389 ClipInlining = false;
1390 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1391 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1392 // compile a level 4 (C2) and then continue executing it.
1393 if (TieredCompilation) {
1394 Tier3InvokeNotifyFreqLog = 0;
1395 Tier4InvocationThreshold = 0;
1396 }
1397 break;
1398 }
1399 }
1400
1401 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1402 // Conflict: required to use shared spaces (-Xshare:on), but
1403 // incompatible command line options were chosen.
1404
1405 static void no_shared_spaces(const char* message) {
1406 if (RequireSharedSpaces) {
1407 jio_fprintf(defaultStream::error_stream(),
1408 "Class data sharing is inconsistent with other specified options.\n");
1409 vm_exit_during_initialization("Unable to use shared archive.", message);
1410 } else {
1411 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1412 }
1413 }
1414 #endif
1415
1416 // Returns threshold scaled with the value of scale.
1417 // If scale < 0.0, threshold is returned without scaling.
1418 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1419 if (scale == 1.0 || scale < 0.0) {
1420 return threshold;
1421 } else {
1422 return (intx)(threshold * scale);
1423 }
1424 }
1425
1426 // Returns freq_log scaled with the value of scale.
1427 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1428 // If scale < 0.0, freq_log is returned without scaling.
1429 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1430 // Check if scaling is necessary or if negative value was specified.
1431 if (scale == 1.0 || scale < 0.0) {
1432 return freq_log;
1433 }
1434 // Check values to avoid calculating log2 of 0.
1435 if (scale == 0.0 || freq_log == 0) {
1436 return 0;
1437 }
1438 // Determine the maximum notification frequency value currently supported.
1439 // The largest mask value that the interpreter/C1 can handle is
1440 // of length InvocationCounter::number_of_count_bits. Mask values are always
1441 // one bit shorter then the value of the notification frequency. Set
1442 // max_freq_bits accordingly.
1443 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1444 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1445 if (scaled_freq == 0) {
1446 // Return 0 right away to avoid calculating log2 of 0.
1447 return 0;
1448 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1449 return max_freq_bits;
1450 } else {
1451 return log2_intptr(scaled_freq);
1452 }
1453 }
1454
1455 void Arguments::set_tiered_flags() {
1456 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1457 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1458 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1459 }
1460 if (CompilationPolicyChoice < 2) {
1461 vm_exit_during_initialization(
1462 "Incompatible compilation policy selected", NULL);
1463 }
1464 // Increase the code cache size - tiered compiles a lot more.
1465 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1466 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1467 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1468 }
1469 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1470 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1471 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1472 }
1473 if (!UseInterpreter) { // -Xcomp
1474 Tier3InvokeNotifyFreqLog = 0;
1475 Tier4InvocationThreshold = 0;
1476 }
1477
1478 if (CompileThresholdScaling < 0) {
1479 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1480 }
1481
1482 // Scale tiered compilation thresholds.
1483 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1484 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1485 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1486 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1487
1488 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1489 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1490 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1491 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1492
1493 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1494 // once these thresholds become supported.
1495
1496 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1497 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1498
1499 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1500 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1501
1502 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1503
1504 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1505 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1506 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1507 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1508 }
1509 }
1510
1511 #if INCLUDE_ALL_GCS
1512 static void disable_adaptive_size_policy(const char* collector_name) {
1513 if (UseAdaptiveSizePolicy) {
1514 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1515 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1516 collector_name);
1517 }
1518 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1519 }
1520 }
1521
1522 void Arguments::set_parnew_gc_flags() {
1523 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1524 "control point invariant");
1525 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1526 assert(UseParNewGC, "ParNew should always be used with CMS");
1527
1528 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1529 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1530 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1531 } else if (ParallelGCThreads == 0) {
1532 jio_fprintf(defaultStream::error_stream(),
1533 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1534 vm_exit(1);
1535 }
1536
1537 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1538 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1539 // we set them to 1024 and 1024.
1540 // See CR 6362902.
1541 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1542 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1543 }
1544 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1545 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1546 }
1547
1548 // When using compressed oops, we use local overflow stacks,
1549 // rather than using a global overflow list chained through
1550 // the klass word of the object's pre-image.
1551 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1552 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1553 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1554 }
1555 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1556 }
1557 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1558 }
1559
1560 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1561 // sparc/solaris for certain applications, but would gain from
1562 // further optimization and tuning efforts, and would almost
1563 // certainly gain from analysis of platform and environment.
1564 void Arguments::set_cms_and_parnew_gc_flags() {
1565 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1566 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1567 assert(UseParNewGC, "ParNew should always be used with CMS");
1568
1569 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1570 disable_adaptive_size_policy("UseConcMarkSweepGC");
1571
1572 set_parnew_gc_flags();
1573
1574 size_t max_heap = align_size_down(MaxHeapSize,
1575 CardTableRS::ct_max_alignment_constraint());
1576
1577 // Now make adjustments for CMS
1578 intx tenuring_default = (intx)6;
1579 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1580
1581 // Preferred young gen size for "short" pauses:
1582 // upper bound depends on # of threads and NewRatio.
1583 const size_t preferred_max_new_size_unaligned =
1584 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1585 size_t preferred_max_new_size =
1586 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1587
1588 // Unless explicitly requested otherwise, size young gen
1589 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1590
1591 // If either MaxNewSize or NewRatio is set on the command line,
1592 // assume the user is trying to set the size of the young gen.
1593 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1594
1595 // Set MaxNewSize to our calculated preferred_max_new_size unless
1596 // NewSize was set on the command line and it is larger than
1597 // preferred_max_new_size.
1598 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1599 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1600 } else {
1601 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1602 }
1603 if (PrintGCDetails && Verbose) {
1604 // Too early to use gclog_or_tty
1605 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1606 }
1607
1608 // Code along this path potentially sets NewSize and OldSize
1609 if (PrintGCDetails && Verbose) {
1610 // Too early to use gclog_or_tty
1611 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1612 " initial_heap_size: " SIZE_FORMAT
1613 " max_heap: " SIZE_FORMAT,
1614 min_heap_size(), InitialHeapSize, max_heap);
1615 }
1616 size_t min_new = preferred_max_new_size;
1617 if (FLAG_IS_CMDLINE(NewSize)) {
1618 min_new = NewSize;
1619 }
1620 if (max_heap > min_new && min_heap_size() > min_new) {
1621 // Unless explicitly requested otherwise, make young gen
1622 // at least min_new, and at most preferred_max_new_size.
1623 if (FLAG_IS_DEFAULT(NewSize)) {
1624 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1625 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1626 if (PrintGCDetails && Verbose) {
1627 // Too early to use gclog_or_tty
1628 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1629 }
1630 }
1631 // Unless explicitly requested otherwise, size old gen
1632 // so it's NewRatio x of NewSize.
1633 if (FLAG_IS_DEFAULT(OldSize)) {
1634 if (max_heap > NewSize) {
1635 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1636 if (PrintGCDetails && Verbose) {
1637 // Too early to use gclog_or_tty
1638 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1639 }
1640 }
1641 }
1642 }
1643 }
1644 // Unless explicitly requested otherwise, definitely
1645 // promote all objects surviving "tenuring_default" scavenges.
1646 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1647 FLAG_IS_DEFAULT(SurvivorRatio)) {
1648 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1649 }
1650 // If we decided above (or user explicitly requested)
1651 // `promote all' (via MaxTenuringThreshold := 0),
1652 // prefer minuscule survivor spaces so as not to waste
1653 // space for (non-existent) survivors
1654 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1655 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1656 }
1657
1658 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1659 // but rather the number of free blocks of a given size that are used when
1660 // replenishing the local per-worker free list caches.
1661 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1662 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1663 // OldPLAB sizing manually turned off: Use a larger default setting,
1664 // unless it was manually specified. This is because a too-low value
1665 // will slow down scavenges.
1666 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1667 } else {
1668 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1669 }
1670 }
1671
1672 // If either of the static initialization defaults have changed, note this
1673 // modification.
1674 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1675 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1676 }
1677
1678 if (!ClassUnloading) {
1679 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1680 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1681 }
1682
1683 if (PrintGCDetails && Verbose) {
1684 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1685 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1686 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1687 }
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 if (PrintGCDetails) {
1735 // Cannot use gclog_or_tty yet.
1736 tty->print_cr("Automatic selection of the low pause collector"
1737 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1738 }
1739 return true;
1740 }
1741 return false;
1742 }
1743
1744 void Arguments::set_use_compressed_oops() {
1745 #ifndef ZERO
1746 #ifdef _LP64
1747 // MaxHeapSize is not set up properly at this point, but
1748 // the only value that can override MaxHeapSize if we are
1749 // to use UseCompressedOops is InitialHeapSize.
1750 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1751
1752 if (max_heap_size <= max_heap_for_compressed_oops()) {
1753 #if !defined(COMPILER1) || defined(TIERED)
1754 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1755 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1756 }
1757 #endif
1758 } else {
1759 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1760 warning("Max heap size too large for Compressed Oops");
1761 FLAG_SET_DEFAULT(UseCompressedOops, false);
1762 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1763 }
1764 }
1765 #endif // _LP64
1766 #endif // ZERO
1767 }
1768
1769
1770 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1771 // set_use_compressed_oops().
1772 void Arguments::set_use_compressed_klass_ptrs() {
1773 #ifndef ZERO
1774 #ifdef _LP64
1775 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1776 if (!UseCompressedOops) {
1777 if (UseCompressedClassPointers) {
1778 warning("UseCompressedClassPointers requires UseCompressedOops");
1779 }
1780 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1781 } else {
1782 // Turn on UseCompressedClassPointers too
1783 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1784 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1785 }
1786 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1787 if (UseCompressedClassPointers) {
1788 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1789 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1790 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1791 }
1792 }
1793 }
1794 #endif // _LP64
1795 #endif // !ZERO
1796 }
1797
1798 void Arguments::set_conservative_max_heap_alignment() {
1799 // The conservative maximum required alignment for the heap is the maximum of
1800 // the alignments imposed by several sources: any requirements from the heap
1801 // itself, the collector policy and the maximum page size we may run the VM
1802 // with.
1803 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1804 #if INCLUDE_ALL_GCS
1805 if (UseParallelGC) {
1806 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1807 } else if (UseG1GC) {
1808 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1809 }
1810 #endif // INCLUDE_ALL_GCS
1811 _conservative_max_heap_alignment = MAX4(heap_alignment,
1812 (size_t)os::vm_allocation_granularity(),
1813 os::max_page_size(),
1814 CollectorPolicy::compute_heap_alignment());
1815 }
1816
1817 void Arguments::select_gc_ergonomically() {
1818 if (os::is_server_class_machine()) {
1819 if (should_auto_select_low_pause_collector()) {
1820 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1821 } else {
1822 #if defined(JAVASE_EMBEDDED)
1823 FLAG_SET_ERGO(bool, UseParallelGC, true);
1824 #else
1825 FLAG_SET_ERGO(bool, UseG1GC, true);
1826 #endif
1827 }
1828 } else {
1829 FLAG_SET_ERGO(bool, UseSerialGC, true);
1830 }
1831 }
1832
1833 void Arguments::select_gc() {
1834 if (!gc_selected()) {
1835 select_gc_ergonomically();
1836 guarantee(gc_selected(), "No GC selected");
1837 }
1838 }
1839
1840 void Arguments::set_ergonomics_flags() {
1841 select_gc();
1842
1843 #if defined(COMPILER2) || INCLUDE_JVMCI
1844 // Shared spaces work fine with other GCs but causes bytecode rewriting
1845 // to be disabled, which hurts interpreter performance and decreases
1846 // server performance. When -server is specified, keep the default off
1847 // unless it is asked for. Future work: either add bytecode rewriting
1848 // at link time, or rewrite bytecodes in non-shared methods.
1849 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1850 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1851 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1852 }
1853 #endif
1854
1855 set_conservative_max_heap_alignment();
1856
1857 #ifndef ZERO
1858 #ifdef _LP64
1859 set_use_compressed_oops();
1860
1861 // set_use_compressed_klass_ptrs() must be called after calling
1862 // set_use_compressed_oops().
1863 set_use_compressed_klass_ptrs();
1864
1865 // Also checks that certain machines are slower with compressed oops
1866 // in vm_version initialization code.
1867 #endif // _LP64
1868 #endif // !ZERO
1869
1870 CodeCacheExtensions::set_ergonomics_flags();
1871 }
1872
1873 void Arguments::set_parallel_gc_flags() {
1874 assert(UseParallelGC || UseParallelOldGC, "Error");
1875 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1876 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1877 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1878 }
1879 FLAG_SET_DEFAULT(UseParallelGC, true);
1880
1881 // If no heap maximum was requested explicitly, use some reasonable fraction
1882 // of the physical memory, up to a maximum of 1GB.
1883 FLAG_SET_DEFAULT(ParallelGCThreads,
1884 Abstract_VM_Version::parallel_worker_threads());
1885 if (ParallelGCThreads == 0) {
1886 jio_fprintf(defaultStream::error_stream(),
1887 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1888 vm_exit(1);
1889 }
1890
1891 if (UseAdaptiveSizePolicy) {
1892 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1893 // unless the user actually sets these flags.
1894 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1895 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1896 }
1897 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1898 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1899 }
1900 }
1901
1902 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1903 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1904 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1905 // See CR 6362902 for details.
1906 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1907 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1908 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1909 }
1910 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1911 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1912 }
1913 }
1914
1915 if (UseParallelOldGC) {
1916 // Par compact uses lower default values since they are treated as
1917 // minimums. These are different defaults because of the different
1918 // interpretation and are not ergonomically set.
1919 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1920 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1921 }
1922 }
1923 }
1924
1925 void Arguments::set_g1_gc_flags() {
1926 assert(UseG1GC, "Error");
1927 #if defined(COMPILER1) || INCLUDE_JVMCI
1928 FastTLABRefill = false;
1929 #endif
1930 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1931 if (ParallelGCThreads == 0) {
1932 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1933 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1934 }
1935
1936 #if INCLUDE_ALL_GCS
1937 if (G1ConcRefinementThreads == 0) {
1938 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1939 }
1940 #endif
1941
1942 // MarkStackSize will be set (if it hasn't been set by the user)
1943 // when concurrent marking is initialized.
1944 // Its value will be based upon the number of parallel marking threads.
1945 // But we do set the maximum mark stack size here.
1946 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1947 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1948 }
1949
1950 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1951 // In G1, we want the default GC overhead goal to be higher than
1952 // it is for PS, or the heap might be expanded too aggressively.
1953 // We set it here to ~8%.
1954 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1955 }
1956
1957 if (PrintGCDetails && Verbose) {
1958 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1959 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1960 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1961 }
1962 }
1963
1964 #if !INCLUDE_ALL_GCS
1965 #ifdef ASSERT
1966 static bool verify_serial_gc_flags() {
1967 return (UseSerialGC &&
1968 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1969 UseParallelGC || UseParallelOldGC));
1970 }
1971 #endif // ASSERT
1972 #endif // INCLUDE_ALL_GCS
1973
1974 void Arguments::set_gc_specific_flags() {
1975 #if INCLUDE_ALL_GCS
1976 // Set per-collector flags
1977 if (UseParallelGC || UseParallelOldGC) {
1978 set_parallel_gc_flags();
1979 } else if (UseConcMarkSweepGC) {
1980 set_cms_and_parnew_gc_flags();
1981 } else if (UseG1GC) {
1982 set_g1_gc_flags();
1983 }
1984 if (AssumeMP && !UseSerialGC) {
1985 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1986 warning("If the number of processors is expected to increase from one, then"
1987 " you should configure the number of parallel GC threads appropriately"
1988 " using -XX:ParallelGCThreads=N");
1989 }
1990 }
1991 if (MinHeapFreeRatio == 100) {
1992 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1993 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1994 }
1995 #else // INCLUDE_ALL_GCS
1996 assert(verify_serial_gc_flags(), "SerialGC unset");
1997 #endif // INCLUDE_ALL_GCS
1998 }
1999
2000 julong Arguments::limit_by_allocatable_memory(julong limit) {
2001 julong max_allocatable;
2002 julong result = limit;
2003 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2004 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2005 }
2006 return result;
2007 }
2008
2009 // Use static initialization to get the default before parsing
2010 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2011
2012 void Arguments::set_heap_size() {
2013 const julong phys_mem =
2014 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2015 : (julong)MaxRAM;
2016
2017 // If the maximum heap size has not been set with -Xmx,
2018 // then set it as fraction of the size of physical memory,
2019 // respecting the maximum and minimum sizes of the heap.
2020 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2021 julong reasonable_max = phys_mem / MaxRAMFraction;
2022
2023 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2024 // Small physical memory, so use a minimum fraction of it for the heap
2025 reasonable_max = phys_mem / MinRAMFraction;
2026 } else {
2027 // Not-small physical memory, so require a heap at least
2028 // as large as MaxHeapSize
2029 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2030 }
2031 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2032 // Limit the heap size to ErgoHeapSizeLimit
2033 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2034 }
2035 if (UseCompressedOops) {
2036 // Limit the heap size to the maximum possible when using compressed oops
2037 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2038
2039 // HeapBaseMinAddress can be greater than default but not less than.
2040 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2041 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2042 // matches compressed oops printing flags
2043 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2044 jio_fprintf(defaultStream::error_stream(),
2045 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2046 " (" SIZE_FORMAT "G) which is greater than value given "
2047 SIZE_FORMAT "\n",
2048 DefaultHeapBaseMinAddress,
2049 DefaultHeapBaseMinAddress/G,
2050 HeapBaseMinAddress);
2051 }
2052 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2053 }
2054 }
2055
2056 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2057 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2058 // but it should be not less than default MaxHeapSize.
2059 max_coop_heap -= HeapBaseMinAddress;
2060 }
2061 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2062 }
2063 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2064
2065 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2066 // An initial heap size was specified on the command line,
2067 // so be sure that the maximum size is consistent. Done
2068 // after call to limit_by_allocatable_memory because that
2069 // method might reduce the allocation size.
2070 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2071 }
2072
2073 if (PrintGCDetails && Verbose) {
2074 // Cannot use gclog_or_tty yet.
2075 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2076 }
2077 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2078 }
2079
2080 // If the minimum or initial heap_size have not been set or requested to be set
2081 // ergonomically, set them accordingly.
2082 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2083 julong reasonable_minimum = (julong)(OldSize + NewSize);
2084
2085 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2086
2087 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2088
2089 if (InitialHeapSize == 0) {
2090 julong reasonable_initial = phys_mem / InitialRAMFraction;
2091
2092 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2093 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2094
2095 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2096
2097 if (PrintGCDetails && Verbose) {
2098 // Cannot use gclog_or_tty yet.
2099 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2100 }
2101 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2102 }
2103 // If the minimum heap size has not been set (via -Xms),
2104 // synchronize with InitialHeapSize to avoid errors with the default value.
2105 if (min_heap_size() == 0) {
2106 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2107 if (PrintGCDetails && Verbose) {
2108 // Cannot use gclog_or_tty yet.
2109 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2110 }
2111 }
2112 }
2113 }
2114
2115 // This option inspects the machine and attempts to set various
2116 // parameters to be optimal for long-running, memory allocation
2117 // intensive jobs. It is intended for machines with large
2118 // amounts of cpu and memory.
2119 jint Arguments::set_aggressive_heap_flags() {
2120 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2121 // VM, but we may not be able to represent the total physical memory
2122 // available (like having 8gb of memory on a box but using a 32bit VM).
2123 // Thus, we need to make sure we're using a julong for intermediate
2124 // calculations.
2125 julong initHeapSize;
2126 julong total_memory = os::physical_memory();
2127
2128 if (total_memory < (julong) 256 * M) {
2129 jio_fprintf(defaultStream::error_stream(),
2130 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2131 vm_exit(1);
2132 }
2133
2134 // The heap size is half of available memory, or (at most)
2135 // all of possible memory less 160mb (leaving room for the OS
2136 // when using ISM). This is the maximum; because adaptive sizing
2137 // is turned on below, the actual space used may be smaller.
2138
2139 initHeapSize = MIN2(total_memory / (julong) 2,
2140 total_memory - (julong) 160 * M);
2141
2142 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2143
2144 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2145 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2146 return JNI_EINVAL;
2147 }
2148 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2149 return JNI_EINVAL;
2150 }
2151 // Currently the minimum size and the initial heap sizes are the same.
2152 set_min_heap_size(initHeapSize);
2153 }
2154 if (FLAG_IS_DEFAULT(NewSize)) {
2155 // Make the young generation 3/8ths of the total heap.
2156 if (FLAG_SET_CMDLINE(size_t, NewSize,
2157 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2158 return JNI_EINVAL;
2159 }
2160 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2161 return JNI_EINVAL;
2162 }
2163 }
2164
2165 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2166 FLAG_SET_DEFAULT(UseLargePages, true);
2167 #endif
2168
2169 // Increase some data structure sizes for efficiency
2170 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2171 return JNI_EINVAL;
2172 }
2173 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2174 return JNI_EINVAL;
2175 }
2176 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2177 return JNI_EINVAL;
2178 }
2179
2180 // See the OldPLABSize comment below, but replace 'after promotion'
2181 // with 'after copying'. YoungPLABSize is the size of the survivor
2182 // space per-gc-thread buffers. The default is 4kw.
2183 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2184 return JNI_EINVAL;
2185 }
2186
2187 // OldPLABSize is the size of the buffers in the old gen that
2188 // UseParallelGC uses to promote live data that doesn't fit in the
2189 // survivor spaces. At any given time, there's one for each gc thread.
2190 // The default size is 1kw. These buffers are rarely used, since the
2191 // survivor spaces are usually big enough. For specjbb, however, there
2192 // are occasions when there's lots of live data in the young gen
2193 // and we end up promoting some of it. We don't have a definite
2194 // explanation for why bumping OldPLABSize helps, but the theory
2195 // is that a bigger PLAB results in retaining something like the
2196 // original allocation order after promotion, which improves mutator
2197 // locality. A minor effect may be that larger PLABs reduce the
2198 // number of PLAB allocation events during gc. The value of 8kw
2199 // was arrived at by experimenting with specjbb.
2200 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2201 return JNI_EINVAL;
2202 }
2203
2204 // Enable parallel GC and adaptive generation sizing
2205 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2206 return JNI_EINVAL;
2207 }
2208 FLAG_SET_DEFAULT(ParallelGCThreads,
2209 Abstract_VM_Version::parallel_worker_threads());
2210
2211 // Encourage steady state memory management
2212 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2213 return JNI_EINVAL;
2214 }
2215
2216 // This appears to improve mutator locality
2217 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2218 return JNI_EINVAL;
2219 }
2220
2221 // Get around early Solaris scheduling bug
2222 // (affinity vs other jobs on system)
2223 // but disallow DR and offlining (5008695).
2224 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2225 return JNI_EINVAL;
2226 }
2227
2228 return JNI_OK;
2229 }
2230
2231 // This must be called after ergonomics.
2232 void Arguments::set_bytecode_flags() {
2233 if (!RewriteBytecodes) {
2234 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2235 }
2236 }
2237
2238 // Aggressive optimization flags -XX:+AggressiveOpts
2239 jint Arguments::set_aggressive_opts_flags() {
2240 #ifdef COMPILER2
2241 if (AggressiveUnboxing) {
2242 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2243 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2244 } else if (!EliminateAutoBox) {
2245 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2246 AggressiveUnboxing = false;
2247 }
2248 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2249 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2250 } else if (!DoEscapeAnalysis) {
2251 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2252 AggressiveUnboxing = false;
2253 }
2254 }
2255 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2256 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2257 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2258 }
2259 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2260 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2261 }
2262
2263 // Feed the cache size setting into the JDK
2264 char buffer[1024];
2265 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2266 if (!add_property(buffer)) {
2267 return JNI_ENOMEM;
2268 }
2269 }
2270 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2271 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2272 }
2273 #endif
2274
2275 if (AggressiveOpts) {
2276 // Sample flag setting code
2277 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2278 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2279 // }
2280 }
2281
2282 return JNI_OK;
2283 }
2284
2285 //===========================================================================================================
2286 // Parsing of java.compiler property
2287
2288 void Arguments::process_java_compiler_argument(const char* arg) {
2289 // For backwards compatibility, Djava.compiler=NONE or ""
2290 // causes us to switch to -Xint mode UNLESS -Xdebug
2291 // is also specified.
2292 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2293 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2294 }
2295 }
2296
2297 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2298 _sun_java_launcher = os::strdup_check_oom(launcher);
2299 }
2300
2301 bool Arguments::created_by_java_launcher() {
2302 assert(_sun_java_launcher != NULL, "property must have value");
2303 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2304 }
2305
2306 bool Arguments::sun_java_launcher_is_altjvm() {
2307 return _sun_java_launcher_is_altjvm;
2308 }
2309
2310 //===========================================================================================================
2311 // Parsing of main arguments
2312
2313 // check if do gclog rotation
2314 // +UseGCLogFileRotation is a must,
2315 // no gc log rotation when log file not supplied or
2316 // NumberOfGCLogFiles is 0
2317 void check_gclog_consistency() {
2318 if (UseGCLogFileRotation) {
2319 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2320 jio_fprintf(defaultStream::output_stream(),
2321 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2322 "where num_of_file > 0\n"
2323 "GC log rotation is turned off\n");
2324 UseGCLogFileRotation = false;
2325 }
2326 }
2327
2328 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2329 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
2330 jio_fprintf(defaultStream::output_stream(),
2331 "GCLogFileSize changed to minimum 8K\n");
2332 }
2333 }
2334 }
2335
2336 // This function is called for -Xloggc:<filename>, it can be used
2337 // to check if a given file name(or string) conforms to the following
2338 // specification:
2339 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2340 // %p and %t only allowed once. We only limit usage of filename not path
2341 bool is_filename_valid(const char *file_name) {
2342 const char* p = file_name;
2343 char file_sep = os::file_separator()[0];
2344 const char* cp;
2345 // skip prefix path
2346 for (cp = file_name; *cp != '\0'; cp++) {
2347 if (*cp == '/' || *cp == file_sep) {
2348 p = cp + 1;
2349 }
2350 }
2351
2352 int count_p = 0;
2353 int count_t = 0;
2354 while (*p != '\0') {
2355 if ((*p >= '0' && *p <= '9') ||
2356 (*p >= 'A' && *p <= 'Z') ||
2357 (*p >= 'a' && *p <= 'z') ||
2358 *p == '-' ||
2359 *p == '_' ||
2360 *p == '.') {
2361 p++;
2362 continue;
2363 }
2364 if (*p == '%') {
2365 if(*(p + 1) == 'p') {
2366 p += 2;
2367 count_p ++;
2368 continue;
2369 }
2370 if (*(p + 1) == 't') {
2371 p += 2;
2372 count_t ++;
2373 continue;
2374 }
2375 }
2376 return false;
2377 }
2378 return count_p < 2 && count_t < 2;
2379 }
2380
2381 // Check consistency of GC selection
2382 bool Arguments::check_gc_consistency() {
2383 check_gclog_consistency();
2384 // Ensure that the user has not selected conflicting sets
2385 // of collectors.
2386 uint i = 0;
2387 if (UseSerialGC) i++;
2388 if (UseConcMarkSweepGC) i++;
2389 if (UseParallelGC || UseParallelOldGC) i++;
2390 if (UseG1GC) i++;
2391 if (i > 1) {
2392 jio_fprintf(defaultStream::error_stream(),
2393 "Conflicting collector combinations in option list; "
2394 "please refer to the release notes for the combinations "
2395 "allowed\n");
2396 return false;
2397 }
2398
2399 if (UseConcMarkSweepGC && !UseParNewGC) {
2400 jio_fprintf(defaultStream::error_stream(),
2401 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2402 return false;
2403 }
2404
2405 if (UseParNewGC && !UseConcMarkSweepGC) {
2406 jio_fprintf(defaultStream::error_stream(),
2407 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2408 return false;
2409 }
2410
2411 return true;
2412 }
2413
2414 // Check the consistency of vm_init_args
2415 bool Arguments::check_vm_args_consistency() {
2416 // Method for adding checks for flag consistency.
2417 // The intent is to warn the user of all possible conflicts,
2418 // before returning an error.
2419 // Note: Needs platform-dependent factoring.
2420 bool status = true;
2421
2422 if (TLABRefillWasteFraction == 0) {
2423 jio_fprintf(defaultStream::error_stream(),
2424 "TLABRefillWasteFraction should be a denominator, "
2425 "not " SIZE_FORMAT "\n",
2426 TLABRefillWasteFraction);
2427 status = false;
2428 }
2429
2430 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2431 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2432 }
2433
2434 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2435 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2436 }
2437
2438 if (GCTimeLimit == 100) {
2439 // Turn off gc-overhead-limit-exceeded checks
2440 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2441 }
2442
2443 status = status && check_gc_consistency();
2444
2445 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2446 // insists that we hold the requisite locks so that the iteration is
2447 // MT-safe. For the verification at start-up and shut-down, we don't
2448 // yet have a good way of acquiring and releasing these locks,
2449 // which are not visible at the CollectedHeap level. We want to
2450 // be able to acquire these locks and then do the iteration rather
2451 // than just disable the lock verification. This will be fixed under
2452 // bug 4788986.
2453 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2454 if (VerifyDuringStartup) {
2455 warning("Heap verification at start-up disabled "
2456 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2457 VerifyDuringStartup = false; // Disable verification at start-up
2458 }
2459
2460 if (VerifyBeforeExit) {
2461 warning("Heap verification at shutdown disabled "
2462 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2463 VerifyBeforeExit = false; // Disable verification at shutdown
2464 }
2465 }
2466
2467 if (PrintNMTStatistics) {
2468 #if INCLUDE_NMT
2469 if (MemTracker::tracking_level() == NMT_off) {
2470 #endif // INCLUDE_NMT
2471 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2472 PrintNMTStatistics = false;
2473 #if INCLUDE_NMT
2474 }
2475 #endif
2476 }
2477 #if INCLUDE_JVMCI
2478 if (EnableJVMCI) {
2479 if (!ScavengeRootsInCode) {
2480 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2481 ScavengeRootsInCode = 1;
2482 }
2483 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2484 TypeProfileLevel = 0;
2485 }
2486 if (UseJVMCICompiler) {
2487 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2488 TypeProfileWidth = 8;
2489 }
2490 }
2491 }
2492 #endif
2493
2494 // Check lower bounds of the code cache
2495 // Template Interpreter code is approximately 3X larger in debug builds.
2496 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2497 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2500 os::vm_page_size()/K);
2501 status = false;
2502 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2503 jio_fprintf(defaultStream::error_stream(),
2504 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2505 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2506 status = false;
2507 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2508 jio_fprintf(defaultStream::error_stream(),
2509 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2510 min_code_cache_size/K);
2511 status = false;
2512 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2513 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2516 CODE_CACHE_SIZE_LIMIT/M);
2517 status = false;
2518 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2519 jio_fprintf(defaultStream::error_stream(),
2520 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2521 min_code_cache_size/K);
2522 status = false;
2523 }
2524
2525 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2526 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2527 }
2528
2529 return status;
2530 }
2531
2532 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2533 const char* option_type) {
2534 if (ignore) return false;
2535
2536 const char* spacer = " ";
2537 if (option_type == NULL) {
2538 option_type = ++spacer; // Set both to the empty string.
2539 }
2540
2541 if (os::obsolete_option(option)) {
2542 jio_fprintf(defaultStream::error_stream(),
2543 "Obsolete %s%soption: %s\n", option_type, spacer,
2544 option->optionString);
2545 return false;
2546 } else {
2547 jio_fprintf(defaultStream::error_stream(),
2548 "Unrecognized %s%soption: %s\n", option_type, spacer,
2549 option->optionString);
2550 return true;
2551 }
2552 }
2553
2554 static const char* user_assertion_options[] = {
2555 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2556 };
2557
2558 static const char* system_assertion_options[] = {
2559 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2560 };
2561
2562 bool Arguments::parse_uintx(const char* value,
2563 uintx* uintx_arg,
2564 uintx min_size) {
2565
2566 // Check the sign first since atomull() parses only unsigned values.
2567 bool value_is_positive = !(*value == '-');
2568
2569 if (value_is_positive) {
2570 julong n;
2571 bool good_return = atomull(value, &n);
2572 if (good_return) {
2573 bool above_minimum = n >= min_size;
2574 bool value_is_too_large = n > max_uintx;
2575
2576 if (above_minimum && !value_is_too_large) {
2577 *uintx_arg = n;
2578 return true;
2579 }
2580 }
2581 }
2582 return false;
2583 }
2584
2585 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2586 julong* long_arg,
2587 julong min_size) {
2588 if (!atomull(s, long_arg)) return arg_unreadable;
2589 return check_memory_size(*long_arg, min_size);
2590 }
2591
2592 // Parse JavaVMInitArgs structure
2593
2594 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2595 const JavaVMInitArgs *java_options_args,
2596 const JavaVMInitArgs *cmd_line_args) {
2597 // For components of the system classpath.
2598 SysClassPath scp(Arguments::get_sysclasspath());
2599 bool scp_assembly_required = false;
2600
2601 // Save default settings for some mode flags
2602 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2603 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2604 Arguments::_ClipInlining = ClipInlining;
2605 Arguments::_BackgroundCompilation = BackgroundCompilation;
2606 if (TieredCompilation) {
2607 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2608 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2609 }
2610
2611 // Setup flags for mixed which is the default
2612 set_mode_flags(_mixed);
2613
2614 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2615 // variable (if present).
2616 jint result = parse_each_vm_init_arg(
2617 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2618 if (result != JNI_OK) {
2619 return result;
2620 }
2621
2622 // Parse args structure generated from the command line flags.
2623 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2624 Flag::COMMAND_LINE);
2625 if (result != JNI_OK) {
2626 return result;
2627 }
2628
2629 // Parse args structure generated from the _JAVA_OPTIONS environment
2630 // variable (if present) (mimics classic VM)
2631 result = parse_each_vm_init_arg(
2632 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2633 if (result != JNI_OK) {
2634 return result;
2635 }
2636
2637 // Do final processing now that all arguments have been parsed
2638 result = finalize_vm_init_args(&scp, scp_assembly_required);
2639 if (result != JNI_OK) {
2640 return result;
2641 }
2642
2643 return JNI_OK;
2644 }
2645
2646 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2647 // represents a valid JDWP agent. is_path==true denotes that we
2648 // are dealing with -agentpath (case where name is a path), otherwise with
2649 // -agentlib
2650 bool valid_jdwp_agent(char *name, bool is_path) {
2651 char *_name;
2652 const char *_jdwp = "jdwp";
2653 size_t _len_jdwp, _len_prefix;
2654
2655 if (is_path) {
2656 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2657 return false;
2658 }
2659
2660 _name++; // skip past last path separator
2661 _len_prefix = strlen(JNI_LIB_PREFIX);
2662
2663 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2664 return false;
2665 }
2666
2667 _name += _len_prefix;
2668 _len_jdwp = strlen(_jdwp);
2669
2670 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2671 _name += _len_jdwp;
2672 }
2673 else {
2674 return false;
2675 }
2676
2677 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2678 return false;
2679 }
2680
2681 return true;
2682 }
2683
2684 if (strcmp(name, _jdwp) == 0) {
2685 return true;
2686 }
2687
2688 return false;
2689 }
2690
2691 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2692 SysClassPath* scp_p,
2693 bool* scp_assembly_required_p,
2694 Flag::Flags origin) {
2695 // Remaining part of option string
2696 const char* tail;
2697
2698 // iterate over arguments
2699 for (int index = 0; index < args->nOptions; index++) {
2700 bool is_absolute_path = false; // for -agentpath vs -agentlib
2701
2702 const JavaVMOption* option = args->options + index;
2703
2704 if (!match_option(option, "-Djava.class.path", &tail) &&
2705 !match_option(option, "-Dsun.java.command", &tail) &&
2706 !match_option(option, "-Dsun.java.launcher", &tail)) {
2707
2708 // add all jvm options to the jvm_args string. This string
2709 // is used later to set the java.vm.args PerfData string constant.
2710 // the -Djava.class.path and the -Dsun.java.command options are
2711 // omitted from jvm_args string as each have their own PerfData
2712 // string constant object.
2713 build_jvm_args(option->optionString);
2714 }
2715
2716 // -verbose:[class/gc/jni]
2717 if (match_option(option, "-verbose", &tail)) {
2718 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2719 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725 } else if (!strcmp(tail, ":gc")) {
2726 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 } else if (!strcmp(tail, ":jni")) {
2730 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 }
2734 // -da / -ea / -disableassertions / -enableassertions
2735 // These accept an optional class/package name separated by a colon, e.g.,
2736 // -da:java.lang.Thread.
2737 } else if (match_option(option, user_assertion_options, &tail, true)) {
2738 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2739 if (*tail == '\0') {
2740 JavaAssertions::setUserClassDefault(enable);
2741 } else {
2742 assert(*tail == ':', "bogus match by match_option()");
2743 JavaAssertions::addOption(tail + 1, enable);
2744 }
2745 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2746 } else if (match_option(option, system_assertion_options, &tail, false)) {
2747 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2748 JavaAssertions::setSystemClassDefault(enable);
2749 // -bootclasspath:
2750 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2751 scp_p->reset_path(tail);
2752 *scp_assembly_required_p = true;
2753 // -bootclasspath/a:
2754 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2755 scp_p->add_suffix(tail);
2756 *scp_assembly_required_p = true;
2757 // -bootclasspath/p:
2758 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2759 scp_p->add_prefix(tail);
2760 *scp_assembly_required_p = true;
2761 // -Xrun
2762 } else if (match_option(option, "-Xrun", &tail)) {
2763 if (tail != NULL) {
2764 const char* pos = strchr(tail, ':');
2765 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2766 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2767 name[len] = '\0';
2768
2769 char *options = NULL;
2770 if(pos != NULL) {
2771 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2772 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2773 }
2774 #if !INCLUDE_JVMTI
2775 if (strcmp(name, "jdwp") == 0) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Debugging agents are not supported in this VM\n");
2778 return JNI_ERR;
2779 }
2780 #endif // !INCLUDE_JVMTI
2781 add_init_library(name, options);
2782 }
2783 // -agentlib and -agentpath
2784 } else if (match_option(option, "-agentlib:", &tail) ||
2785 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2786 if(tail != NULL) {
2787 const char* pos = strchr(tail, '=');
2788 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2789 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2790 name[len] = '\0';
2791
2792 char *options = NULL;
2793 if(pos != NULL) {
2794 options = os::strdup_check_oom(pos + 1, mtInternal);
2795 }
2796 #if !INCLUDE_JVMTI
2797 if (valid_jdwp_agent(name, is_absolute_path)) {
2798 jio_fprintf(defaultStream::error_stream(),
2799 "Debugging agents are not supported in this VM\n");
2800 return JNI_ERR;
2801 }
2802 #endif // !INCLUDE_JVMTI
2803 add_init_agent(name, options, is_absolute_path);
2804 }
2805 // -javaagent
2806 } else if (match_option(option, "-javaagent:", &tail)) {
2807 #if !INCLUDE_JVMTI
2808 jio_fprintf(defaultStream::error_stream(),
2809 "Instrumentation agents are not supported in this VM\n");
2810 return JNI_ERR;
2811 #else
2812 if(tail != NULL) {
2813 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2814 add_init_agent("instrument", options, false);
2815 }
2816 #endif // !INCLUDE_JVMTI
2817 // -Xnoclassgc
2818 } else if (match_option(option, "-Xnoclassgc")) {
2819 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2820 return JNI_EINVAL;
2821 }
2822 // -Xconcgc
2823 } else if (match_option(option, "-Xconcgc")) {
2824 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2825 return JNI_EINVAL;
2826 }
2827 // -Xnoconcgc
2828 } else if (match_option(option, "-Xnoconcgc")) {
2829 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2830 return JNI_EINVAL;
2831 }
2832 // -Xbatch
2833 } else if (match_option(option, "-Xbatch")) {
2834 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2835 return JNI_EINVAL;
2836 }
2837 // -Xmn for compatibility with other JVM vendors
2838 } else if (match_option(option, "-Xmn", &tail)) {
2839 julong long_initial_young_size = 0;
2840 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2841 if (errcode != arg_in_range) {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Invalid initial young generation size: %s\n", option->optionString);
2844 describe_range_error(errcode);
2845 return JNI_EINVAL;
2846 }
2847 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2848 return JNI_EINVAL;
2849 }
2850 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2851 return JNI_EINVAL;
2852 }
2853 // -Xms
2854 } else if (match_option(option, "-Xms", &tail)) {
2855 julong long_initial_heap_size = 0;
2856 // an initial heap size of 0 means automatically determine
2857 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2858 if (errcode != arg_in_range) {
2859 jio_fprintf(defaultStream::error_stream(),
2860 "Invalid initial heap size: %s\n", option->optionString);
2861 describe_range_error(errcode);
2862 return JNI_EINVAL;
2863 }
2864 set_min_heap_size((size_t)long_initial_heap_size);
2865 // Currently the minimum size and the initial heap sizes are the same.
2866 // Can be overridden with -XX:InitialHeapSize.
2867 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 // -Xmx
2871 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2872 julong long_max_heap_size = 0;
2873 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2874 if (errcode != arg_in_range) {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Invalid maximum heap size: %s\n", option->optionString);
2877 describe_range_error(errcode);
2878 return JNI_EINVAL;
2879 }
2880 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2881 return JNI_EINVAL;
2882 }
2883 // Xmaxf
2884 } else if (match_option(option, "-Xmaxf", &tail)) {
2885 char* err;
2886 int maxf = (int)(strtod(tail, &err) * 100);
2887 if (*err != '\0' || *tail == '\0') {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Bad max heap free percentage size: %s\n",
2890 option->optionString);
2891 return JNI_EINVAL;
2892 } else {
2893 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896 }
2897 // Xminf
2898 } else if (match_option(option, "-Xminf", &tail)) {
2899 char* err;
2900 int minf = (int)(strtod(tail, &err) * 100);
2901 if (*err != '\0' || *tail == '\0') {
2902 jio_fprintf(defaultStream::error_stream(),
2903 "Bad min heap free percentage size: %s\n",
2904 option->optionString);
2905 return JNI_EINVAL;
2906 } else {
2907 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 }
2911 // -Xss
2912 } else if (match_option(option, "-Xss", &tail)) {
2913 julong long_ThreadStackSize = 0;
2914 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2915 if (errcode != arg_in_range) {
2916 jio_fprintf(defaultStream::error_stream(),
2917 "Invalid thread stack size: %s\n", option->optionString);
2918 describe_range_error(errcode);
2919 return JNI_EINVAL;
2920 }
2921 // Internally track ThreadStackSize in units of 1024 bytes.
2922 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2923 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2927 } else if (match_option(option, "-Xoss", &tail) ||
2928 match_option(option, "-Xsqnopause") ||
2929 match_option(option, "-Xoptimize") ||
2930 match_option(option, "-Xboundthreads") ||
2931 match_option(option, "-Xusealtsigs")) {
2932 // All these options are deprecated in JDK 9 and will be removed in a future release
2933 char version[256];
2934 JDK_Version::jdk(9).to_string(version, sizeof(version));
2935 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2936 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2937 julong long_CodeCacheExpansionSize = 0;
2938 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2939 if (errcode != arg_in_range) {
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2942 os::vm_page_size()/K);
2943 return JNI_EINVAL;
2944 }
2945 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2949 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2950 julong long_ReservedCodeCacheSize = 0;
2951
2952 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2953 if (errcode != arg_in_range) {
2954 jio_fprintf(defaultStream::error_stream(),
2955 "Invalid maximum code cache size: %s.\n", option->optionString);
2956 return JNI_EINVAL;
2957 }
2958 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 // -XX:NonNMethodCodeHeapSize=
2962 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2963 julong long_NonNMethodCodeHeapSize = 0;
2964
2965 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2966 if (errcode != arg_in_range) {
2967 jio_fprintf(defaultStream::error_stream(),
2968 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2969 return JNI_EINVAL;
2970 }
2971 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2972 return JNI_EINVAL;
2973 }
2974 // -XX:ProfiledCodeHeapSize=
2975 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2976 julong long_ProfiledCodeHeapSize = 0;
2977
2978 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2979 if (errcode != arg_in_range) {
2980 jio_fprintf(defaultStream::error_stream(),
2981 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2982 return JNI_EINVAL;
2983 }
2984 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2985 return JNI_EINVAL;
2986 }
2987 // -XX:NonProfiledCodeHeapSizee=
2988 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2989 julong long_NonProfiledCodeHeapSize = 0;
2990
2991 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2992 if (errcode != arg_in_range) {
2993 jio_fprintf(defaultStream::error_stream(),
2994 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2995 return JNI_EINVAL;
2996 }
2997 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2998 return JNI_EINVAL;
2999 }
3000 // -green
3001 } else if (match_option(option, "-green")) {
3002 jio_fprintf(defaultStream::error_stream(),
3003 "Green threads support not available\n");
3004 return JNI_EINVAL;
3005 // -native
3006 } else if (match_option(option, "-native")) {
3007 // HotSpot always uses native threads, ignore silently for compatibility
3008 // -Xrs
3009 } else if (match_option(option, "-Xrs")) {
3010 // Classic/EVM option, new functionality
3011 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3012 return JNI_EINVAL;
3013 }
3014 // -Xprof
3015 } else if (match_option(option, "-Xprof")) {
3016 #if INCLUDE_FPROF
3017 _has_profile = true;
3018 #else // INCLUDE_FPROF
3019 jio_fprintf(defaultStream::error_stream(),
3020 "Flat profiling is not supported in this VM.\n");
3021 return JNI_ERR;
3022 #endif // INCLUDE_FPROF
3023 // -Xconcurrentio
3024 } else if (match_option(option, "-Xconcurrentio")) {
3025 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3026 return JNI_EINVAL;
3027 }
3028 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3029 return JNI_EINVAL;
3030 }
3031 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3032 return JNI_EINVAL;
3033 }
3034 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3035 return JNI_EINVAL;
3036 }
3037 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3038 return JNI_EINVAL;
3039 }
3040
3041 // -Xinternalversion
3042 } else if (match_option(option, "-Xinternalversion")) {
3043 jio_fprintf(defaultStream::output_stream(), "%s\n",
3044 VM_Version::internal_vm_info_string());
3045 vm_exit(0);
3046 #ifndef PRODUCT
3047 // -Xprintflags
3048 } else if (match_option(option, "-Xprintflags")) {
3049 CommandLineFlags::printFlags(tty, false);
3050 vm_exit(0);
3051 #endif
3052 // -D
3053 } else if (match_option(option, "-D", &tail)) {
3054 const char* value;
3055 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3056 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3057 // abort if -Djava.endorsed.dirs is set
3058 jio_fprintf(defaultStream::output_stream(),
3059 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3060 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3061 return JNI_EINVAL;
3062 }
3063 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3064 *value != '\0' && strcmp(value, "\"\"") != 0) {
3065 // abort if -Djava.ext.dirs is set
3066 jio_fprintf(defaultStream::output_stream(),
3067 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3068 return JNI_EINVAL;
3069 }
3070
3071 if (!add_property(tail)) {
3072 return JNI_ENOMEM;
3073 }
3074 // Out of the box management support
3075 if (match_option(option, "-Dcom.sun.management", &tail)) {
3076 #if INCLUDE_MANAGEMENT
3077 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3078 return JNI_EINVAL;
3079 }
3080 #else
3081 jio_fprintf(defaultStream::output_stream(),
3082 "-Dcom.sun.management is not supported in this VM.\n");
3083 return JNI_ERR;
3084 #endif
3085 }
3086 // -Xint
3087 } else if (match_option(option, "-Xint")) {
3088 set_mode_flags(_int);
3089 // -Xmixed
3090 } else if (match_option(option, "-Xmixed")) {
3091 set_mode_flags(_mixed);
3092 // -Xcomp
3093 } else if (match_option(option, "-Xcomp")) {
3094 // for testing the compiler; turn off all flags that inhibit compilation
3095 set_mode_flags(_comp);
3096 // -Xshare:dump
3097 } else if (match_option(option, "-Xshare:dump")) {
3098 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3099 return JNI_EINVAL;
3100 }
3101 set_mode_flags(_int); // Prevent compilation, which creates objects
3102 // -Xshare:on
3103 } else if (match_option(option, "-Xshare:on")) {
3104 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3105 return JNI_EINVAL;
3106 }
3107 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3108 return JNI_EINVAL;
3109 }
3110 // -Xshare:auto
3111 } else if (match_option(option, "-Xshare:auto")) {
3112 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3113 return JNI_EINVAL;
3114 }
3115 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3116 return JNI_EINVAL;
3117 }
3118 // -Xshare:off
3119 } else if (match_option(option, "-Xshare:off")) {
3120 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3121 return JNI_EINVAL;
3122 }
3123 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3124 return JNI_EINVAL;
3125 }
3126 // -Xverify
3127 } else if (match_option(option, "-Xverify", &tail)) {
3128 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3129 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3130 return JNI_EINVAL;
3131 }
3132 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3133 return JNI_EINVAL;
3134 }
3135 } else if (strcmp(tail, ":remote") == 0) {
3136 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3137 return JNI_EINVAL;
3138 }
3139 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3140 return JNI_EINVAL;
3141 }
3142 } else if (strcmp(tail, ":none") == 0) {
3143 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3144 return JNI_EINVAL;
3145 }
3146 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3150 return JNI_EINVAL;
3151 }
3152 // -Xdebug
3153 } else if (match_option(option, "-Xdebug")) {
3154 // note this flag has been used, then ignore
3155 set_xdebug_mode(true);
3156 // -Xnoagent
3157 } else if (match_option(option, "-Xnoagent")) {
3158 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3159 } else if (match_option(option, "-Xloggc:", &tail)) {
3160 // Redirect GC output to the file. -Xloggc:<filename>
3161 // ostream_init_log(), when called will use this filename
3162 // to initialize a fileStream.
3163 _gc_log_filename = os::strdup_check_oom(tail);
3164 if (!is_filename_valid(_gc_log_filename)) {
3165 jio_fprintf(defaultStream::output_stream(),
3166 "Invalid file name for use with -Xloggc: Filename can only contain the "
3167 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3168 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3169 return JNI_EINVAL;
3170 }
3171 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
3175 return JNI_EINVAL;
3176 }
3177 } else if (match_option(option, "-Xlog", &tail)) {
3178 bool ret = false;
3179 if (strcmp(tail, ":help") == 0) {
3180 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3181 vm_exit(0);
3182 } else if (strcmp(tail, ":disable") == 0) {
3183 LogConfiguration::disable_logging();
3184 ret = true;
3185 } else if (*tail == '\0') {
3186 ret = LogConfiguration::parse_command_line_arguments();
3187 assert(ret, "-Xlog without arguments should never fail to parse");
3188 } else if (*tail == ':') {
3189 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3190 }
3191 if (ret == false) {
3192 jio_fprintf(defaultStream::error_stream(),
3193 "Invalid -Xlog option '-Xlog%s'\n",
3194 tail);
3195 return JNI_EINVAL;
3196 }
3197 // JNI hooks
3198 } else if (match_option(option, "-Xcheck", &tail)) {
3199 if (!strcmp(tail, ":jni")) {
3200 #if !INCLUDE_JNI_CHECK
3201 warning("JNI CHECKING is not supported in this VM");
3202 #else
3203 CheckJNICalls = true;
3204 #endif // INCLUDE_JNI_CHECK
3205 } else if (is_bad_option(option, args->ignoreUnrecognized,
3206 "check")) {
3207 return JNI_EINVAL;
3208 }
3209 } else if (match_option(option, "vfprintf")) {
3210 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3211 } else if (match_option(option, "exit")) {
3212 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3213 } else if (match_option(option, "abort")) {
3214 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3215 // -XX:+AggressiveHeap
3216 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3217 jint result = set_aggressive_heap_flags();
3218 if (result != JNI_OK) {
3219 return result;
3220 }
3221 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3222 // and the last option wins.
3223 } else if (match_option(option, "-XX:+NeverTenure")) {
3224 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3225 return JNI_EINVAL;
3226 }
3227 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3228 return JNI_EINVAL;
3229 }
3230 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3231 return JNI_EINVAL;
3232 }
3233 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3234 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3235 return JNI_EINVAL;
3236 }
3237 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3238 return JNI_EINVAL;
3239 }
3240 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3241 return JNI_EINVAL;
3242 }
3243 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3244 uintx max_tenuring_thresh = 0;
3245 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3246 jio_fprintf(defaultStream::error_stream(),
3247 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3248 return JNI_EINVAL;
3249 }
3250
3251 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3252 return JNI_EINVAL;
3253 }
3254
3255 if (MaxTenuringThreshold == 0) {
3256 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3257 return JNI_EINVAL;
3258 }
3259 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3260 return JNI_EINVAL;
3261 }
3262 } else {
3263 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3264 return JNI_EINVAL;
3265 }
3266 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3267 return JNI_EINVAL;
3268 }
3269 }
3270 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3271 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3272 return JNI_EINVAL;
3273 }
3274 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3275 return JNI_EINVAL;
3276 }
3277 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3278 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3279 return JNI_EINVAL;
3280 }
3281 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3282 return JNI_EINVAL;
3283 }
3284 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3285 #if defined(DTRACE_ENABLED)
3286 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3287 return JNI_EINVAL;
3288 }
3289 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3293 return JNI_EINVAL;
3294 }
3295 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3296 return JNI_EINVAL;
3297 }
3298 #else // defined(DTRACE_ENABLED)
3299 jio_fprintf(defaultStream::error_stream(),
3300 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3301 return JNI_EINVAL;
3302 #endif // defined(DTRACE_ENABLED)
3303 #ifdef ASSERT
3304 } else if (match_option(option, "-XX:+FullGCALot")) {
3305 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3306 return JNI_EINVAL;
3307 }
3308 // disable scavenge before parallel mark-compact
3309 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3310 return JNI_EINVAL;
3311 }
3312 #endif
3313 #if !INCLUDE_MANAGEMENT
3314 } else if (match_option(option, "-XX:+ManagementServer")) {
3315 jio_fprintf(defaultStream::error_stream(),
3316 "ManagementServer is not supported in this VM.\n");
3317 return JNI_ERR;
3318 #endif // INCLUDE_MANAGEMENT
3319 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3320 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3321 // already been handled
3322 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3323 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3324 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3325 return JNI_EINVAL;
3326 }
3327 }
3328 // Unknown option
3329 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3330 return JNI_ERR;
3331 }
3332 }
3333
3334 // PrintSharedArchiveAndExit will turn on
3335 // -Xshare:on
3336 // -XX:+TraceClassPaths
3337 if (PrintSharedArchiveAndExit) {
3338 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3339 return JNI_EINVAL;
3340 }
3341 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3342 return JNI_EINVAL;
3343 }
3344 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3345 return JNI_EINVAL;
3346 }
3347 }
3348
3349 // Change the default value for flags which have different default values
3350 // when working with older JDKs.
3351 #ifdef LINUX
3352 if (JDK_Version::current().compare_major(6) <= 0 &&
3353 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3354 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3355 }
3356 #endif // LINUX
3357 fix_appclasspath();
3358 return JNI_OK;
3359 }
3360
3361 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3362 //
3363 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3364 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3365 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3366 // path is treated as the current directory.
3367 //
3368 // This causes problems with CDS, which requires that all directories specified in the classpath
3369 // must be empty. In most cases, applications do NOT want to load classes from the current
3370 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3371 // scripts compatible with CDS.
3372 void Arguments::fix_appclasspath() {
3373 if (IgnoreEmptyClassPaths) {
3374 const char separator = *os::path_separator();
3375 const char* src = _java_class_path->value();
3376
3377 // skip over all the leading empty paths
3378 while (*src == separator) {
3379 src ++;
3380 }
3381
3382 char* copy = os::strdup_check_oom(src, mtInternal);
3383
3384 // trim all trailing empty paths
3385 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3386 *tail = '\0';
3387 }
3388
3389 char from[3] = {separator, separator, '\0'};
3390 char to [2] = {separator, '\0'};
3391 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3392 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3393 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3394 }
3395
3396 _java_class_path->set_value(copy);
3397 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3398 }
3399
3400 if (!PrintSharedArchiveAndExit) {
3401 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3402 }
3403 }
3404
3405 static bool has_jar_files(const char* directory) {
3406 DIR* dir = os::opendir(directory);
3407 if (dir == NULL) return false;
3408
3409 struct dirent *entry;
3410 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3411 bool hasJarFile = false;
3412 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3413 const char* name = entry->d_name;
3414 const char* ext = name + strlen(name) - 4;
3415 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3416 }
3417 FREE_C_HEAP_ARRAY(char, dbuf);
3418 os::closedir(dir);
3419 return hasJarFile ;
3420 }
3421
3422 static int check_non_empty_dirs(const char* path) {
3423 const char separator = *os::path_separator();
3424 const char* const end = path + strlen(path);
3425 int nonEmptyDirs = 0;
3426 while (path < end) {
3427 const char* tmp_end = strchr(path, separator);
3428 if (tmp_end == NULL) {
3429 if (has_jar_files(path)) {
3430 nonEmptyDirs++;
3431 jio_fprintf(defaultStream::output_stream(),
3432 "Non-empty directory: %s\n", path);
3433 }
3434 path = end;
3435 } else {
3436 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3437 memcpy(dirpath, path, tmp_end - path);
3438 dirpath[tmp_end - path] = '\0';
3439 if (has_jar_files(dirpath)) {
3440 nonEmptyDirs++;
3441 jio_fprintf(defaultStream::output_stream(),
3442 "Non-empty directory: %s\n", dirpath);
3443 }
3444 FREE_C_HEAP_ARRAY(char, dirpath);
3445 path = tmp_end + 1;
3446 }
3447 }
3448 return nonEmptyDirs;
3449 }
3450
3451 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3452 // check if the default lib/endorsed directory exists; if so, error
3453 char path[JVM_MAXPATHLEN];
3454 const char* fileSep = os::file_separator();
3455 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3456
3457 #if INCLUDE_JVMCI
3458 if (EnableJVMCI) {
3459 JVMCIRuntime::save_options(_system_properties);
3460 }
3461 #endif // INCLUDE_JVMCI
3462
3463 if (CheckEndorsedAndExtDirs) {
3464 int nonEmptyDirs = 0;
3465 // check endorsed directory
3466 nonEmptyDirs += check_non_empty_dirs(path);
3467 // check the extension directories
3468 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3469 if (nonEmptyDirs > 0) {
3470 return JNI_ERR;
3471 }
3472 }
3473
3474 DIR* dir = os::opendir(path);
3475 if (dir != NULL) {
3476 jio_fprintf(defaultStream::output_stream(),
3477 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3478 "in modular form will be supported via the concept of upgradeable modules.\n");
3479 os::closedir(dir);
3480 return JNI_ERR;
3481 }
3482
3483 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3484 dir = os::opendir(path);
3485 if (dir != NULL) {
3486 jio_fprintf(defaultStream::output_stream(),
3487 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3488 "Use -classpath instead.\n.");
3489 os::closedir(dir);
3490 return JNI_ERR;
3491 }
3492
3493 if (scp_assembly_required) {
3494 // Assemble the bootclasspath elements into the final path.
3495 char *combined_path = scp_p->combined_path();
3496 Arguments::set_sysclasspath(combined_path);
3497 FREE_C_HEAP_ARRAY(char, combined_path);
3498 }
3499
3500 // This must be done after all arguments have been processed.
3501 // java_compiler() true means set to "NONE" or empty.
3502 if (java_compiler() && !xdebug_mode()) {
3503 // For backwards compatibility, we switch to interpreted mode if
3504 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3505 // not specified.
3506 set_mode_flags(_int);
3507 }
3508
3509 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3510 // but like -Xint, leave compilation thresholds unaffected.
3511 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3512 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3513 set_mode_flags(_int);
3514 }
3515
3516 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3517 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3518 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3519 }
3520
3521 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3522 // Don't degrade server performance for footprint
3523 if (FLAG_IS_DEFAULT(UseLargePages) &&
3524 MaxHeapSize < LargePageHeapSizeThreshold) {
3525 // No need for large granularity pages w/small heaps.
3526 // Note that large pages are enabled/disabled for both the
3527 // Java heap and the code cache.
3528 FLAG_SET_DEFAULT(UseLargePages, false);
3529 }
3530
3531 #elif defined(COMPILER2)
3532 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3533 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3534 }
3535 #endif
3536
3537 #ifndef TIERED
3538 // Tiered compilation is undefined.
3539 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3540 #endif
3541
3542 // If we are running in a headless jre, force java.awt.headless property
3543 // to be true unless the property has already been set.
3544 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3545 if (os::is_headless_jre()) {
3546 const char* headless = Arguments::get_property("java.awt.headless");
3547 if (headless == NULL) {
3548 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3549 if (headless_env == NULL) {
3550 if (!add_property("java.awt.headless=true")) {
3551 return JNI_ENOMEM;
3552 }
3553 } else {
3554 char buffer[256];
3555 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3556 if (!add_property(buffer)) {
3557 return JNI_ENOMEM;
3558 }
3559 }
3560 }
3561 }
3562
3563 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3564 // CMS can only be used with ParNew
3565 FLAG_SET_ERGO(bool, UseParNewGC, true);
3566 }
3567
3568 if (!check_vm_args_consistency()) {
3569 return JNI_ERR;
3570 }
3571
3572 return JNI_OK;
3573 }
3574
3575 // Helper class for controlling the lifetime of JavaVMInitArgs
3576 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3577 // deleted on the destruction of the ScopedVMInitArgs object.
3578 class ScopedVMInitArgs : public StackObj {
3579 private:
3580 JavaVMInitArgs _args;
3581 bool _is_set;
3582
3583 public:
3584 ScopedVMInitArgs() {
3585 _args.version = JNI_VERSION_1_2;
3586 _args.nOptions = 0;
3587 _args.options = NULL;
3588 _args.ignoreUnrecognized = false;
3589 _is_set = false;
3590 }
3591
3592 // Populates the JavaVMInitArgs object represented by this
3593 // ScopedVMInitArgs object with the arguments in options. The
3594 // allocated memory is deleted by the destructor. If this method
3595 // returns anything other than JNI_OK, then this object is in a
3596 // partially constructed state, and should be abandoned.
3597 jint set_args(GrowableArray<JavaVMOption>* options) {
3598 _is_set = true;
3599 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3600 JavaVMOption, options->length(), mtInternal);
3601 if (options_arr == NULL) {
3602 return JNI_ENOMEM;
3603 }
3604 _args.options = options_arr;
3605
3606 for (int i = 0; i < options->length(); i++) {
3607 options_arr[i] = options->at(i);
3608 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3609 if (options_arr[i].optionString == NULL) {
3610 // Rely on the destructor to do cleanup.
3611 _args.nOptions = i;
3612 return JNI_ENOMEM;
3613 }
3614 }
3615
3616 _args.nOptions = options->length();
3617 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3618 return JNI_OK;
3619 }
3620
3621 JavaVMInitArgs* get() { return &_args; }
3622 bool is_set() { return _is_set; }
3623
3624 ~ScopedVMInitArgs() {
3625 if (_args.options == NULL) return;
3626 for (int i = 0; i < _args.nOptions; i++) {
3627 os::free(_args.options[i].optionString);
3628 }
3629 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3630 }
3631
3632 // Insert options into this option list, to replace option at
3633 // vm_options_file_pos (-XX:VMOptionsFile)
3634 jint insert(const JavaVMInitArgs* args,
3635 const JavaVMInitArgs* args_to_insert,
3636 const int vm_options_file_pos) {
3637 assert(_args.options == NULL, "shouldn't be set yet");
3638 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3639 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3640
3641 int length = args->nOptions + args_to_insert->nOptions - 1;
3642 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3643 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3644 for (int i = 0; i < args->nOptions; i++) {
3645 if (i == vm_options_file_pos) {
3646 // insert the new options starting at the same place as the
3647 // -XX:VMOptionsFile option
3648 for (int j = 0; j < args_to_insert->nOptions; j++) {
3649 options->push(args_to_insert->options[j]);
3650 }
3651 } else {
3652 options->push(args->options[i]);
3653 }
3654 }
3655 // make into options array
3656 jint result = set_args(options);
3657 delete options;
3658 return result;
3659 }
3660 };
3661
3662 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3663 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3664 }
3665
3666 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3667 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3668 }
3669
3670 jint Arguments::parse_options_environment_variable(const char* name,
3671 ScopedVMInitArgs* vm_args) {
3672 char *buffer = ::getenv(name);
3673
3674 // Don't check this environment variable if user has special privileges
3675 // (e.g. unix su command).
3676 if (buffer == NULL || os::have_special_privileges()) {
3677 return JNI_OK;
3678 }
3679
3680 if ((buffer = os::strdup(buffer)) == NULL) {
3681 return JNI_ENOMEM;
3682 }
3683
3684 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3685
3686 os::free(buffer);
3687 return retcode;
3688 }
3689
3690 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3691 // read file into buffer
3692 int fd = ::open(file_name, O_RDONLY);
3693 if (fd < 0) {
3694 jio_fprintf(defaultStream::error_stream(),
3695 "Could not open options file '%s'\n",
3696 file_name);
3697 return JNI_ERR;
3698 }
3699
3700 struct stat stbuf;
3701 int retcode = os::stat(file_name, &stbuf);
3702 if (retcode != 0) {
3703 jio_fprintf(defaultStream::error_stream(),
3704 "Could not stat options file '%s'\n",
3705 file_name);
3706 os::close(fd);
3707 return JNI_ERR;
3708 }
3709
3710 if (stbuf.st_size == 0) {
3711 // tell caller there is no option data and that is ok
3712 os::close(fd);
3713 return JNI_OK;
3714 }
3715
3716 // '+ 1' for NULL termination even with max bytes
3717 size_t bytes_alloc = stbuf.st_size + 1;
3718
3719 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3720 if (NULL == buf) {
3721 jio_fprintf(defaultStream::error_stream(),
3722 "Could not allocate read buffer for options file parse\n");
3723 os::close(fd);
3724 return JNI_ENOMEM;
3725 }
3726
3727 memset(buf, 0, bytes_alloc);
3728
3729 // Fill buffer
3730 // Use ::read() instead of os::read because os::read()
3731 // might do a thread state transition
3732 // and it is too early for that here
3733
3734 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3735 os::close(fd);
3736 if (bytes_read < 0) {
3737 FREE_C_HEAP_ARRAY(char, buf);
3738 jio_fprintf(defaultStream::error_stream(),
3739 "Could not read options file '%s'\n", file_name);
3740 return JNI_ERR;
3741 }
3742
3743 if (bytes_read == 0) {
3744 // tell caller there is no option data and that is ok
3745 FREE_C_HEAP_ARRAY(char, buf);
3746 return JNI_OK;
3747 }
3748
3749 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3750
3751 FREE_C_HEAP_ARRAY(char, buf);
3752 return retcode;
3753 }
3754
3755 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3756 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3757
3758 // some pointers to help with parsing
3759 char *buffer_end = buffer + buf_len;
3760 char *opt_hd = buffer;
3761 char *wrt = buffer;
3762 char *rd = buffer;
3763
3764 // parse all options
3765 while (rd < buffer_end) {
3766 // skip leading white space from the input string
3767 while (rd < buffer_end && isspace(*rd)) {
3768 rd++;
3769 }
3770
3771 if (rd >= buffer_end) {
3772 break;
3773 }
3774
3775 // Remember this is where we found the head of the token.
3776 opt_hd = wrt;
3777
3778 // Tokens are strings of non white space characters separated
3779 // by one or more white spaces.
3780 while (rd < buffer_end && !isspace(*rd)) {
3781 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3782 int quote = *rd; // matching quote to look for
3783 rd++; // don't copy open quote
3784 while (rd < buffer_end && *rd != quote) {
3785 // include everything (even spaces)
3786 // up until the close quote
3787 *wrt++ = *rd++; // copy to option string
3788 }
3789
3790 if (rd < buffer_end) {
3791 rd++; // don't copy close quote
3792 } else {
3793 // did not see closing quote
3794 jio_fprintf(defaultStream::error_stream(),
3795 "Unmatched quote in %s\n", name);
3796 delete options;
3797 return JNI_ERR;
3798 }
3799 } else {
3800 *wrt++ = *rd++; // copy to option string
3801 }
3802 }
3803
3804 // steal a white space character and set it to NULL
3805 *wrt++ = '\0';
3806 // We now have a complete token
3807
3808 JavaVMOption option;
3809 option.optionString = opt_hd;
3810 option.extraInfo = NULL;
3811
3812 options->append(option); // Fill in option
3813
3814 rd++; // Advance to next character
3815 }
3816
3817 // Fill out JavaVMInitArgs structure.
3818 jint status = vm_args->set_args(options);
3819
3820 delete options;
3821 return status;
3822 }
3823
3824 void Arguments::set_shared_spaces_flags() {
3825 if (DumpSharedSpaces) {
3826 if (RequireSharedSpaces) {
3827 warning("Cannot dump shared archive while using shared archive");
3828 }
3829 UseSharedSpaces = false;
3830 #ifdef _LP64
3831 if (!UseCompressedOops || !UseCompressedClassPointers) {
3832 vm_exit_during_initialization(
3833 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3834 }
3835 } else {
3836 if (!UseCompressedOops || !UseCompressedClassPointers) {
3837 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3838 }
3839 #endif
3840 }
3841 }
3842
3843 #if !INCLUDE_ALL_GCS
3844 static void force_serial_gc() {
3845 FLAG_SET_DEFAULT(UseSerialGC, true);
3846 UNSUPPORTED_GC_OPTION(UseG1GC);
3847 UNSUPPORTED_GC_OPTION(UseParallelGC);
3848 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3849 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3850 UNSUPPORTED_GC_OPTION(UseParNewGC);
3851 }
3852 #endif // INCLUDE_ALL_GCS
3853
3854 // Sharing support
3855 // Construct the path to the archive
3856 static char* get_shared_archive_path() {
3857 char *shared_archive_path;
3858 if (SharedArchiveFile == NULL) {
3859 char jvm_path[JVM_MAXPATHLEN];
3860 os::jvm_path(jvm_path, sizeof(jvm_path));
3861 char *end = strrchr(jvm_path, *os::file_separator());
3862 if (end != NULL) *end = '\0';
3863 size_t jvm_path_len = strlen(jvm_path);
3864 size_t file_sep_len = strlen(os::file_separator());
3865 const size_t len = jvm_path_len + file_sep_len + 20;
3866 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3867 if (shared_archive_path != NULL) {
3868 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3869 jvm_path, os::file_separator());
3870 }
3871 } else {
3872 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3873 }
3874 return shared_archive_path;
3875 }
3876
3877 #ifndef PRODUCT
3878 // Determine whether LogVMOutput should be implicitly turned on.
3879 static bool use_vm_log() {
3880 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3881 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3882 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3883 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3884 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3885 return true;
3886 }
3887
3888 #ifdef COMPILER1
3889 if (PrintC1Statistics) {
3890 return true;
3891 }
3892 #endif // COMPILER1
3893
3894 #ifdef COMPILER2
3895 if (PrintOptoAssembly || PrintOptoStatistics) {
3896 return true;
3897 }
3898 #endif // COMPILER2
3899
3900 return false;
3901 }
3902
3903 #endif // PRODUCT
3904
3905 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3906 char** vm_options_file,
3907 const int vm_options_file_pos,
3908 ScopedVMInitArgs *vm_options_file_args,
3909 ScopedVMInitArgs* args_out) {
3910 jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args);
3911 if (code != JNI_OK) {
3912 return code;
3913 }
3914
3915 if (vm_options_file_args->get()->nOptions < 1) {
3916 return JNI_OK;
3917 }
3918
3919 return args_out->insert(args, vm_options_file_args->get(),
3920 vm_options_file_pos);
3921 }
3922
3923 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3924 char ** vm_options_file,
3925 ScopedVMInitArgs* args_out) {
3926 // Remaining part of option string
3927 const char* tail;
3928 int vm_options_file_pos = -1;
3929 ScopedVMInitArgs vm_options_file_args;
3930
3931 for (int index = 0; index < args->nOptions; index++) {
3932 const JavaVMOption* option = args->options + index;
3933 if (ArgumentsExt::process_options(option)) {
3934 continue;
3935 }
3936 if (match_option(option, "-XX:Flags=", &tail)) {
3937 Arguments::set_jvm_flags_file(tail);
3938 continue;
3939 }
3940 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3941 if (vm_options_file != NULL) {
3942 // The caller accepts -XX:VMOptionsFile
3943 if (*vm_options_file != NULL) {
3944 jio_fprintf(defaultStream::error_stream(),
3945 "The VM Options file can only be specified once and "
3946 "only on the command line.\n");
3947 return JNI_EINVAL;
3948 }
3949
3950 *vm_options_file = (char *) tail;
3951 vm_options_file_pos = index; // save position of -XX:VMOptionsFile
3952 // If there's a VMOptionsFile, parse that (also can set flags_file)
3953 jint code = insert_vm_options_file(args, vm_options_file,
3954 vm_options_file_pos,
3955 &vm_options_file_args, args_out);
3956 if (code != JNI_OK) {
3957 return code;
3958 }
3959 if (args_out->is_set()) {
3960 // The VMOptions file inserted some options so switch 'args'
3961 // to the new set of options, and continue processing which
3962 // preserves "last option wins" semantics.
3963 args = args_out->get();
3964 // The first option from the VMOptionsFile replaces the
3965 // current option. So we back track to process the
3966 // replacement option.
3967 index--;
3968 }
3969 } else {
3970 jio_fprintf(defaultStream::error_stream(),
3971 "VM options file is only supported on the command line\n");
3972 return JNI_EINVAL;
3973 }
3974 continue;
3975 }
3976 if (match_option(option, "-XX:+PrintVMOptions")) {
3977 PrintVMOptions = true;
3978 continue;
3979 }
3980 if (match_option(option, "-XX:-PrintVMOptions")) {
3981 PrintVMOptions = false;
3982 continue;
3983 }
3984 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3985 IgnoreUnrecognizedVMOptions = true;
3986 continue;
3987 }
3988 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3989 IgnoreUnrecognizedVMOptions = false;
3990 continue;
3991 }
3992 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3993 CommandLineFlags::printFlags(tty, false);
3994 vm_exit(0);
3995 }
3996 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3997 #if INCLUDE_NMT
3998 // The launcher did not setup nmt environment variable properly.
3999 if (!MemTracker::check_launcher_nmt_support(tail)) {
4000 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4001 }
4002
4003 // Verify if nmt option is valid.
4004 if (MemTracker::verify_nmt_option()) {
4005 // Late initialization, still in single-threaded mode.
4006 if (MemTracker::tracking_level() >= NMT_summary) {
4007 MemTracker::init();
4008 }
4009 } else {
4010 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4011 }
4012 continue;
4013 #else
4014 jio_fprintf(defaultStream::error_stream(),
4015 "Native Memory Tracking is not supported in this VM\n");
4016 return JNI_ERR;
4017 #endif
4018 }
4019
4020 #ifndef PRODUCT
4021 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4022 CommandLineFlags::printFlags(tty, true);
4023 vm_exit(0);
4024 }
4025 #endif
4026 }
4027 return JNI_OK;
4028 }
4029
4030 static void print_options(const JavaVMInitArgs *args) {
4031 const char* tail;
4032 for (int index = 0; index < args->nOptions; index++) {
4033 const JavaVMOption *option = args->options + index;
4034 if (match_option(option, "-XX:", &tail)) {
4035 logOption(tail);
4036 }
4037 }
4038 }
4039
4040 // Parse entry point called from JNI_CreateJavaVM
4041
4042 jint Arguments::parse(const JavaVMInitArgs* args) {
4043 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4044
4045 // Initialize ranges and constraints
4046 CommandLineFlagRangeList::init();
4047 CommandLineFlagConstraintList::init();
4048
4049 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4050 const char* hotspotrc = ".hotspotrc";
4051 char* vm_options_file = NULL;
4052 bool settings_file_specified = false;
4053 bool needs_hotspotrc_warning = false;
4054 ScopedVMInitArgs java_tool_options_args;
4055 ScopedVMInitArgs java_options_args;
4056 ScopedVMInitArgs modified_cmd_line_args;
4057
4058 jint code =
4059 parse_java_tool_options_environment_variable(&java_tool_options_args);
4060 if (code != JNI_OK) {
4061 return code;
4062 }
4063
4064 code = parse_java_options_environment_variable(&java_options_args);
4065 if (code != JNI_OK) {
4066 return code;
4067 }
4068
4069 code = match_special_option_and_act(java_tool_options_args.get(),
4070 NULL, NULL);
4071 if (code != JNI_OK) {
4072 return code;
4073 }
4074
4075 code = match_special_option_and_act(args, &vm_options_file,
4076 &modified_cmd_line_args);
4077 if (code != JNI_OK) {
4078 return code;
4079 }
4080
4081
4082 // The command line arguments have been modified to include VMOptionsFile arguments.
4083 if (modified_cmd_line_args.is_set()) {
4084 args = modified_cmd_line_args.get();
4085 }
4086
4087 code = match_special_option_and_act(java_options_args.get(),
4088 NULL, NULL);
4089 if (code != JNI_OK) {
4090 return code;
4091 }
4092
4093 const char * flags_file = Arguments::get_jvm_flags_file();
4094 settings_file_specified = (flags_file != NULL);
4095
4096 if (IgnoreUnrecognizedVMOptions) {
4097 // uncast const to modify the flag args->ignoreUnrecognized
4098 *(jboolean*)(&args->ignoreUnrecognized) = true;
4099 java_tool_options_args.get()->ignoreUnrecognized = true;
4100 java_options_args.get()->ignoreUnrecognized = true;
4101 }
4102
4103 // Parse specified settings file
4104 if (settings_file_specified) {
4105 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4106 return JNI_EINVAL;
4107 }
4108 } else {
4109 #ifdef ASSERT
4110 // Parse default .hotspotrc settings file
4111 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4112 return JNI_EINVAL;
4113 }
4114 #else
4115 struct stat buf;
4116 if (os::stat(hotspotrc, &buf) == 0) {
4117 needs_hotspotrc_warning = true;
4118 }
4119 #endif
4120 }
4121
4122 if (PrintVMOptions) {
4123 print_options(java_tool_options_args.get());
4124 print_options(args);
4125 print_options(java_options_args.get());
4126 }
4127
4128 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4129 jint result = parse_vm_init_args(java_tool_options_args.get(),
4130 java_options_args.get(),
4131 args); // command line arguments
4132
4133 if (result != JNI_OK) {
4134 return result;
4135 }
4136
4137 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4138 SharedArchivePath = get_shared_archive_path();
4139 if (SharedArchivePath == NULL) {
4140 return JNI_ENOMEM;
4141 }
4142
4143 // Set up VerifySharedSpaces
4144 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4145 VerifySharedSpaces = true;
4146 }
4147
4148 // Delay warning until here so that we've had a chance to process
4149 // the -XX:-PrintWarnings flag
4150 if (needs_hotspotrc_warning) {
4151 warning("%s file is present but has been ignored. "
4152 "Run with -XX:Flags=%s to load the file.",
4153 hotspotrc, hotspotrc);
4154 }
4155
4156 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4157 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4158 #endif
4159
4160 ArgumentsExt::report_unsupported_options();
4161
4162 #ifndef PRODUCT
4163 if (TraceBytecodesAt != 0) {
4164 TraceBytecodes = true;
4165 }
4166 if (CountCompiledCalls) {
4167 if (UseCounterDecay) {
4168 warning("UseCounterDecay disabled because CountCalls is set");
4169 UseCounterDecay = false;
4170 }
4171 }
4172 #endif // PRODUCT
4173
4174 if (ScavengeRootsInCode == 0) {
4175 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4176 warning("Forcing ScavengeRootsInCode non-zero");
4177 }
4178 ScavengeRootsInCode = 1;
4179 }
4180
4181 if (PrintGCDetails) {
4182 // Turn on -verbose:gc options as well
4183 PrintGC = true;
4184 }
4185
4186 // Set object alignment values.
4187 set_object_alignment();
4188
4189 #if !INCLUDE_ALL_GCS
4190 force_serial_gc();
4191 #endif // INCLUDE_ALL_GCS
4192 #if !INCLUDE_CDS
4193 if (DumpSharedSpaces || RequireSharedSpaces) {
4194 jio_fprintf(defaultStream::error_stream(),
4195 "Shared spaces are not supported in this VM\n");
4196 return JNI_ERR;
4197 }
4198 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4199 warning("Shared spaces are not supported in this VM");
4200 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4201 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4202 }
4203 no_shared_spaces("CDS Disabled");
4204 #endif // INCLUDE_CDS
4205
4206 return JNI_OK;
4207 }
4208
4209 jint Arguments::apply_ergo() {
4210
4211 // Set flags based on ergonomics.
4212 set_ergonomics_flags();
4213
4214 set_shared_spaces_flags();
4215
4216 // Check the GC selections again.
4217 if (!check_gc_consistency()) {
4218 return JNI_EINVAL;
4219 }
4220
4221 if (TieredCompilation) {
4222 set_tiered_flags();
4223 } else {
4224 int max_compilation_policy_choice = 1;
4225 #ifdef COMPILER2
4226 max_compilation_policy_choice = 2;
4227 #endif
4228 // Check if the policy is valid.
4229 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4230 vm_exit_during_initialization(
4231 "Incompatible compilation policy selected", NULL);
4232 }
4233 // Scale CompileThreshold
4234 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4235 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4236 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4237 }
4238 }
4239
4240 #ifdef COMPILER2
4241 #ifndef PRODUCT
4242 if (PrintIdealGraphLevel > 0) {
4243 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4244 }
4245 #endif
4246 #endif
4247
4248 // Set heap size based on available physical memory
4249 set_heap_size();
4250
4251 ArgumentsExt::set_gc_specific_flags();
4252
4253 // Initialize Metaspace flags and alignments
4254 Metaspace::ergo_initialize();
4255
4256 // Set bytecode rewriting flags
4257 set_bytecode_flags();
4258
4259 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4260 jint code = set_aggressive_opts_flags();
4261 if (code != JNI_OK) {
4262 return code;
4263 }
4264
4265 // Turn off biased locking for locking debug mode flags,
4266 // which are subtly different from each other but neither works with
4267 // biased locking
4268 if (UseHeavyMonitors
4269 #ifdef COMPILER1
4270 || !UseFastLocking
4271 #endif // COMPILER1
4272 #if INCLUDE_JVMCI
4273 || !JVMCIUseFastLocking
4274 #endif
4275 ) {
4276 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4277 // flag set to true on command line; warn the user that they
4278 // can't enable biased locking here
4279 warning("Biased Locking is not supported with locking debug flags"
4280 "; ignoring UseBiasedLocking flag." );
4281 }
4282 UseBiasedLocking = false;
4283 }
4284
4285 #ifdef ZERO
4286 // Clear flags not supported on zero.
4287 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4288 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4289 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4290 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4291 #endif // CC_INTERP
4292
4293 #ifdef COMPILER2
4294 if (!EliminateLocks) {
4295 EliminateNestedLocks = false;
4296 }
4297 if (!Inline) {
4298 IncrementalInline = false;
4299 }
4300 #ifndef PRODUCT
4301 if (!IncrementalInline) {
4302 AlwaysIncrementalInline = false;
4303 }
4304 #endif
4305 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4306 // nothing to use the profiling, turn if off
4307 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4308 }
4309 #endif
4310
4311 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4312 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4313 DebugNonSafepoints = true;
4314 }
4315
4316 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4317 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4318 }
4319
4320 #ifndef PRODUCT
4321 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4322 if (use_vm_log()) {
4323 LogVMOutput = true;
4324 }
4325 }
4326 #endif // PRODUCT
4327
4328 if (PrintCommandLineFlags) {
4329 CommandLineFlags::printSetFlags(tty);
4330 }
4331
4332 // Apply CPU specific policy for the BiasedLocking
4333 if (UseBiasedLocking) {
4334 if (!VM_Version::use_biased_locking() &&
4335 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4336 UseBiasedLocking = false;
4337 }
4338 }
4339 #ifdef COMPILER2
4340 if (!UseBiasedLocking || EmitSync != 0) {
4341 UseOptoBiasInlining = false;
4342 }
4343 #endif
4344
4345 return JNI_OK;
4346 }
4347
4348 jint Arguments::adjust_after_os() {
4349 if (UseNUMA) {
4350 if (UseParallelGC || UseParallelOldGC) {
4351 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4352 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4353 }
4354 }
4355 // UseNUMAInterleaving is set to ON for all collectors and
4356 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4357 // such as the parallel collector for Linux and Solaris will
4358 // interleave old gen and survivor spaces on top of NUMA
4359 // allocation policy for the eden space.
4360 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4361 // all platforms and ParallelGC on Windows will interleave all
4362 // of the heap spaces across NUMA nodes.
4363 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4364 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4365 }
4366 }
4367 return JNI_OK;
4368 }
4369
4370 int Arguments::PropertyList_count(SystemProperty* pl) {
4371 int count = 0;
4372 while(pl != NULL) {
4373 count++;
4374 pl = pl->next();
4375 }
4376 return count;
4377 }
4378
4379 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4380 assert(key != NULL, "just checking");
4381 SystemProperty* prop;
4382 for (prop = pl; prop != NULL; prop = prop->next()) {
4383 if (strcmp(key, prop->key()) == 0) return prop->value();
4384 }
4385 return NULL;
4386 }
4387
4388 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4389 int count = 0;
4390 const char* ret_val = NULL;
4391
4392 while(pl != NULL) {
4393 if(count >= index) {
4394 ret_val = pl->key();
4395 break;
4396 }
4397 count++;
4398 pl = pl->next();
4399 }
4400
4401 return ret_val;
4402 }
4403
4404 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4405 int count = 0;
4406 char* ret_val = NULL;
4407
4408 while(pl != NULL) {
4409 if(count >= index) {
4410 ret_val = pl->value();
4411 break;
4412 }
4413 count++;
4414 pl = pl->next();
4415 }
4416
4417 return ret_val;
4418 }
4419
4420 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4421 SystemProperty* p = *plist;
4422 if (p == NULL) {
4423 *plist = new_p;
4424 } else {
4425 while (p->next() != NULL) {
4426 p = p->next();
4427 }
4428 p->set_next(new_p);
4429 }
4430 }
4431
4432 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4433 if (plist == NULL)
4434 return;
4435
4436 SystemProperty* new_p = new SystemProperty(k, v, true);
4437 PropertyList_add(plist, new_p);
4438 }
4439
4440 void Arguments::PropertyList_add(SystemProperty *element) {
4441 PropertyList_add(&_system_properties, element);
4442 }
4443
4444 // This add maintains unique property key in the list.
4445 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4446 if (plist == NULL)
4447 return;
4448
4449 // If property key exist then update with new value.
4450 SystemProperty* prop;
4451 for (prop = *plist; prop != NULL; prop = prop->next()) {
4452 if (strcmp(k, prop->key()) == 0) {
4453 if (append) {
4454 prop->append_value(v);
4455 } else {
4456 prop->set_value(v);
4457 }
4458 return;
4459 }
4460 }
4461
4462 PropertyList_add(plist, k, v);
4463 }
4464
4465 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4466 // Returns true if all of the source pointed by src has been copied over to
4467 // the destination buffer pointed by buf. Otherwise, returns false.
4468 // Notes:
4469 // 1. If the length (buflen) of the destination buffer excluding the
4470 // NULL terminator character is not long enough for holding the expanded
4471 // pid characters, it also returns false instead of returning the partially
4472 // expanded one.
4473 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4474 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4475 char* buf, size_t buflen) {
4476 const char* p = src;
4477 char* b = buf;
4478 const char* src_end = &src[srclen];
4479 char* buf_end = &buf[buflen - 1];
4480
4481 while (p < src_end && b < buf_end) {
4482 if (*p == '%') {
4483 switch (*(++p)) {
4484 case '%': // "%%" ==> "%"
4485 *b++ = *p++;
4486 break;
4487 case 'p': { // "%p" ==> current process id
4488 // buf_end points to the character before the last character so
4489 // that we could write '\0' to the end of the buffer.
4490 size_t buf_sz = buf_end - b + 1;
4491 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4492
4493 // if jio_snprintf fails or the buffer is not long enough to hold
4494 // the expanded pid, returns false.
4495 if (ret < 0 || ret >= (int)buf_sz) {
4496 return false;
4497 } else {
4498 b += ret;
4499 assert(*b == '\0', "fail in copy_expand_pid");
4500 if (p == src_end && b == buf_end + 1) {
4501 // reach the end of the buffer.
4502 return true;
4503 }
4504 }
4505 p++;
4506 break;
4507 }
4508 default :
4509 *b++ = '%';
4510 }
4511 } else {
4512 *b++ = *p++;
4513 }
4514 }
4515 *b = '\0';
4516 return (p == src_end); // return false if not all of the source was copied
4517 }