1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logTag.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/arguments_ext.hpp"
44 #include "runtime/commandLineFlagConstraintList.hpp"
45 #include "runtime/commandLineFlagRangeList.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.hpp"
50 #include "runtime/vm_version.hpp"
51 #include "services/management.hpp"
52 #include "services/memTracker.hpp"
53 #include "utilities/defaultStream.hpp"
54 #include "utilities/macros.hpp"
55 #include "utilities/stringUtils.hpp"
56 #if INCLUDE_JVMCI
57 #include "jvmci/jvmciRuntime.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc/cms/compactibleFreeListSpace.hpp"
61 #include "gc/g1/g1CollectedHeap.inline.hpp"
62 #include "gc/parallel/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 #define UNSUPPORTED_GC_OPTION(gc) \
70 do { \
71 if (gc) { \
72 if (FLAG_IS_CMDLINE(gc)) { \
73 warning(#gc " is not supported in this VM. Using Serial GC."); \
74 } \
75 FLAG_SET_DEFAULT(gc, false); \
76 } \
77 } while(0)
78
79 char* Arguments::_jvm_flags_file = NULL;
80 char** Arguments::_jvm_flags_array = NULL;
81 int Arguments::_num_jvm_flags = 0;
82 char** Arguments::_jvm_args_array = NULL;
83 int Arguments::_num_jvm_args = 0;
84 char* Arguments::_java_command = NULL;
85 SystemProperty* Arguments::_system_properties = NULL;
86 const char* Arguments::_gc_log_filename = NULL;
87 bool Arguments::_has_profile = false;
88 size_t Arguments::_conservative_max_heap_alignment = 0;
89 size_t Arguments::_min_heap_size = 0;
90 Arguments::Mode Arguments::_mode = _mixed;
91 bool Arguments::_java_compiler = false;
92 bool Arguments::_xdebug_mode = false;
93 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
95 int Arguments::_sun_java_launcher_pid = -1;
96 bool Arguments::_sun_java_launcher_is_altjvm = false;
97
98 // These parameters are reset in method parse_vm_init_args()
99 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
100 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
101 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
102 bool Arguments::_ClipInlining = ClipInlining;
103 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
104 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
105
106 char* Arguments::SharedArchivePath = NULL;
107
108 AgentLibraryList Arguments::_libraryList;
109 AgentLibraryList Arguments::_agentList;
110
111 abort_hook_t Arguments::_abort_hook = NULL;
112 exit_hook_t Arguments::_exit_hook = NULL;
113 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
114
115
116 SystemProperty *Arguments::_sun_boot_library_path = NULL;
117 SystemProperty *Arguments::_java_library_path = NULL;
118 SystemProperty *Arguments::_java_home = NULL;
119 SystemProperty *Arguments::_java_class_path = NULL;
120 SystemProperty *Arguments::_sun_boot_class_path = NULL;
121
122 char* Arguments::_ext_dirs = NULL;
123
124 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
125 // part of the option string.
126 static bool match_option(const JavaVMOption *option, const char* name,
127 const char** tail) {
128 size_t len = strlen(name);
129 if (strncmp(option->optionString, name, len) == 0) {
130 *tail = option->optionString + len;
131 return true;
132 } else {
133 return false;
134 }
135 }
136
137 // Check if 'option' matches 'name'. No "tail" is allowed.
138 static bool match_option(const JavaVMOption *option, const char* name) {
139 const char* tail = NULL;
140 bool result = match_option(option, name, &tail);
141 if (tail != NULL && *tail == '\0') {
142 return result;
143 } else {
144 return false;
145 }
146 }
147
148 // Return true if any of the strings in null-terminated array 'names' matches.
149 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
150 // the option must match exactly.
151 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
152 bool tail_allowed) {
153 for (/* empty */; *names != NULL; ++names) {
154 if (match_option(option, *names, tail)) {
155 if (**tail == '\0' || tail_allowed && **tail == ':') {
156 return true;
157 }
158 }
159 }
160 return false;
161 }
162
163 static void logOption(const char* opt) {
164 if (PrintVMOptions) {
165 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
166 }
167 }
168
169 // Process java launcher properties.
170 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
171 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
172 // sun.java.launcher.pid is defined.
173 // Must do this before setting up other system properties,
174 // as some of them may depend on launcher type.
175 for (int index = 0; index < args->nOptions; index++) {
176 const JavaVMOption* option = args->options + index;
177 const char* tail;
178
179 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
180 process_java_launcher_argument(tail, option->extraInfo);
181 continue;
182 }
183 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
184 if (strcmp(tail, "true") == 0) {
185 _sun_java_launcher_is_altjvm = true;
186 }
187 continue;
188 }
189 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
190 _sun_java_launcher_pid = atoi(tail);
191 continue;
192 }
193 }
194 }
195
196 // Initialize system properties key and value.
197 void Arguments::init_system_properties() {
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
199 "Java Virtual Machine Specification", false));
200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
201 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
202 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
203 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
204
205 // Following are JVMTI agent writable properties.
206 // Properties values are set to NULL and they are
207 // os specific they are initialized in os::init_system_properties_values().
208 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
209 _java_library_path = new SystemProperty("java.library.path", NULL, true);
210 _java_home = new SystemProperty("java.home", NULL, true);
211 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
212
213 _java_class_path = new SystemProperty("java.class.path", "", true);
214
215 // Add to System Property list.
216 PropertyList_add(&_system_properties, _sun_boot_library_path);
217 PropertyList_add(&_system_properties, _java_library_path);
218 PropertyList_add(&_system_properties, _java_home);
219 PropertyList_add(&_system_properties, _java_class_path);
220 PropertyList_add(&_system_properties, _sun_boot_class_path);
221
222 // Set OS specific system properties values
223 os::init_system_properties_values();
224
225 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
226 }
227
228 // Update/Initialize System properties after JDK version number is known
229 void Arguments::init_version_specific_system_properties() {
230 enum { bufsz = 16 };
231 char buffer[bufsz];
232 const char* spec_vendor = "Oracle Corporation";
233 uint32_t spec_version = JDK_Version::current().major_version();
234
235 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
236
237 PropertyList_add(&_system_properties,
238 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
239 PropertyList_add(&_system_properties,
240 new SystemProperty("java.vm.specification.version", buffer, false));
241 PropertyList_add(&_system_properties,
242 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
243 }
244
245 /*
246 * -XX argument processing:
247 *
248 * -XX arguments are defined in several places, such as:
249 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
250 * -XX arguments are parsed in parse_argument().
251 * -XX argument bounds checking is done in check_vm_args_consistency().
252 *
253 * Over time -XX arguments may change. There are mechanisms to handle common cases:
254 *
255 * ALIASED: An option that is simply another name for another option. This is often
256 * part of the process of deprecating a flag, but not all aliases need
257 * to be deprecated.
258 *
259 * Create an alias for an option by adding the old and new option names to the
260 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
261 *
262 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
263 * support may be removed in the future. Both regular and aliased options may be
264 * deprecated.
265 *
266 * Add a deprecation warning for an option (or alias) by adding an entry in the
267 * "special_jvm_flags" table and setting the "deprecated_in" field.
268 * Often an option "deprecated" in one major release will
269 * be made "obsolete" in the next. In this case the entry should also have it's
270 * "obsolete_in" field set.
271 *
272 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
273 * on the command line. A warning is printed to let the user know that option might not
274 * be accepted in the future.
275 *
276 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
277 * table and setting the "obsolete_in" field.
278 *
279 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
280 * to the current JDK version. The system will flatly refuse to admit the existence of
281 * the flag. This allows a flag to die automatically over JDK releases.
282 *
283 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
284 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
285 * - Newly obsolete or expired deprecated options should have their global variable
286 * definitions removed (from globals.hpp, etc) and related implementations removed.
287 *
288 * Recommended approach for removing options:
289 *
290 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
291 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
292 *
293 * To remove internal options (e.g. diagnostic, experimental, develop options), use
294 * a 2-step model adding major release numbers to the obsolete and expire columns.
295 *
296 * To change the name of an option, use the alias table as well as a 2-step
297 * model adding major release numbers to the deprecate and expire columns.
298 * Think twice about aliasing commonly used customer options.
299 *
300 * There are times when it is appropriate to leave a future release number as undefined.
301 *
302 * Tests: Aliases should be tested in VMAliasOptions.java.
303 * Deprecated options should be tested in VMDeprecatedOptions.java.
304 */
305
306 // Obsolete or deprecated -XX flag.
307 typedef struct {
308 const char* name;
309 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
310 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
311 JDK_Version expired_in; // When the option expires (or "undefined").
312 } SpecialFlag;
313
314 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
315 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
316 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
317 // the command-line as usual, but will issue a warning.
318 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
319 // the command-line, while issuing a warning and ignoring the flag value.
320 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
321 // existence of the flag.
322 //
323 // MANUAL CLEANUP ON JDK VERSION UPDATES:
324 // This table ensures that the handling of options will update automatically when the JDK
325 // version is incremented, but the source code needs to be cleanup up manually:
326 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
327 // variable should be removed, as well as users of the variable.
328 // - As "deprecated" options age into "obsolete" options, move the entry into the
329 // "Obsolete Flags" section of the table.
330 // - All expired options should be removed from the table.
331 static SpecialFlag const special_jvm_flags[] = {
332 // -------------- Deprecated Flags --------------
333 // --- Non-alias flags - sorted by obsolete_in then expired_in:
334 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
335 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
336
337 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
338 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
339 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
340 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
341 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
342 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
343 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
344 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
345
346 // -------------- Obsolete Flags - sorted by expired_in --------------
347 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
348 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
349 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 #ifndef ZERO
361 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 #endif // ZERO
364 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
373
374 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
375 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
376 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
377 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
378 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
379 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
380 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
381 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
382 #endif
383
384 { NULL, JDK_Version(0), JDK_Version(0) }
385 };
386
387 // Flags that are aliases for other flags.
388 typedef struct {
389 const char* alias_name;
390 const char* real_name;
391 } AliasedFlag;
392
393 static AliasedFlag const aliased_jvm_flags[] = {
394 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
395 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
396 { "CMSMarkStackSize", "MarkStackSize" },
397 { "G1MarkStackSize", "MarkStackSize" },
398 { "ParallelMarkingThreads", "ConcGCThreads" },
399 { "ParallelCMSThreads", "ConcGCThreads" },
400 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
401 { NULL, NULL}
402 };
403
404 static AliasedLoggingFlag const aliased_logging_flags[] = {
405 { "TraceClassLoading", LogLevel::Info, true, LogTag::_classload },
406 { "TraceClassUnloading", LogLevel::Info, true, LogTag::_classunload },
407 { "TraceClassResolution", LogLevel::Info, true, LogTag::_classresolve },
408 { "TraceExceptions", LogLevel::Info, true, LogTag::_exceptions },
409 { "TraceMonitorInflation", LogLevel::Debug, true, LogTag::_monitorinflation },
410 { NULL, LogLevel::Off, false, LogTag::__NO_TAG }
411 };
412
413 // Return true if "v" is less than "other", where "other" may be "undefined".
414 static bool version_less_than(JDK_Version v, JDK_Version other) {
415 assert(!v.is_undefined(), "must be defined");
416 if (!other.is_undefined() && v.compare(other) >= 0) {
417 return false;
418 } else {
419 return true;
420 }
421 }
422
423 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
424 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
425 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
426 flag = special_jvm_flags[i];
427 return true;
428 }
429 }
430 return false;
431 }
432
433 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
434 assert(version != NULL, "Must provide a version buffer");
435 SpecialFlag flag;
436 if (lookup_special_flag(flag_name, flag)) {
437 if (!flag.obsolete_in.is_undefined()) {
438 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
439 *version = flag.obsolete_in;
440 return true;
441 }
442 }
443 }
444 return false;
445 }
446
447 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
448 assert(version != NULL, "Must provide a version buffer");
449 SpecialFlag flag;
450 if (lookup_special_flag(flag_name, flag)) {
451 if (!flag.deprecated_in.is_undefined()) {
452 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
453 version_less_than(JDK_Version::current(), flag.expired_in)) {
454 *version = flag.deprecated_in;
455 return 1;
456 } else {
457 return -1;
458 }
459 }
460 }
461 return 0;
462 }
463
464 const char* Arguments::real_flag_name(const char *flag_name) {
465 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
466 const AliasedFlag& flag_status = aliased_jvm_flags[i];
467 if (strcmp(flag_status.alias_name, flag_name) == 0) {
468 return flag_status.real_name;
469 }
470 }
471 return flag_name;
472 }
473
474 #ifdef ASSERT
475 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
476 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
477 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
478 return true;
479 }
480 }
481 return false;
482 }
483
484 static bool verify_special_jvm_flags() {
485 bool success = true;
486 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
487 const SpecialFlag& flag = special_jvm_flags[i];
488 if (lookup_special_flag(flag.name, i)) {
489 warning("Duplicate special flag declaration \"%s\"", flag.name);
490 success = false;
491 }
492 if (flag.deprecated_in.is_undefined() &&
493 flag.obsolete_in.is_undefined()) {
494 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
495 success = false;
496 }
497
498 if (!flag.deprecated_in.is_undefined()) {
499 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
500 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
501 success = false;
502 }
503
504 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
505 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
506 success = false;
507 }
508 }
509
510 if (!flag.obsolete_in.is_undefined()) {
511 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
512 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
513 success = false;
514 }
515
516 // if flag has become obsolete it should not have a "globals" flag defined anymore.
517 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
518 if (Flag::find_flag(flag.name) != NULL) {
519 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
520 success = false;
521 }
522 }
523 }
524
525 if (!flag.expired_in.is_undefined()) {
526 // if flag has become expired it should not have a "globals" flag defined anymore.
527 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
528 if (Flag::find_flag(flag.name) != NULL) {
529 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
530 success = false;
531 }
532 }
533 }
534
535 }
536 return success;
537 }
538 #endif
539
540 // Constructs the system class path (aka boot class path) from the following
541 // components, in order:
542 //
543 // prefix // from -Xbootclasspath/p:...
544 // base // from os::get_system_properties() or -Xbootclasspath=
545 // suffix // from -Xbootclasspath/a:...
546 //
547 // This could be AllStatic, but it isn't needed after argument processing is
548 // complete.
549 class SysClassPath: public StackObj {
550 public:
551 SysClassPath(const char* base);
552 ~SysClassPath();
553
554 inline void set_base(const char* base);
555 inline void add_prefix(const char* prefix);
556 inline void add_suffix_to_prefix(const char* suffix);
557 inline void add_suffix(const char* suffix);
558 inline void reset_path(const char* base);
559
560 inline const char* get_base() const { return _items[_scp_base]; }
561 inline const char* get_prefix() const { return _items[_scp_prefix]; }
562 inline const char* get_suffix() const { return _items[_scp_suffix]; }
563
564 // Combine all the components into a single c-heap-allocated string; caller
565 // must free the string if/when no longer needed.
566 char* combined_path();
567
568 private:
569 // Utility routines.
570 static char* add_to_path(const char* path, const char* str, bool prepend);
571 static char* add_jars_to_path(char* path, const char* directory);
572
573 inline void reset_item_at(int index);
574
575 // Array indices for the items that make up the sysclasspath. All except the
576 // base are allocated in the C heap and freed by this class.
577 enum {
578 _scp_prefix, // from -Xbootclasspath/p:...
579 _scp_base, // the default sysclasspath
580 _scp_suffix, // from -Xbootclasspath/a:...
581 _scp_nitems // the number of items, must be last.
582 };
583
584 const char* _items[_scp_nitems];
585 };
586
587 SysClassPath::SysClassPath(const char* base) {
588 memset(_items, 0, sizeof(_items));
589 _items[_scp_base] = base;
590 }
591
592 SysClassPath::~SysClassPath() {
593 // Free everything except the base.
594 for (int i = 0; i < _scp_nitems; ++i) {
595 if (i != _scp_base) reset_item_at(i);
596 }
597 }
598
599 inline void SysClassPath::set_base(const char* base) {
600 _items[_scp_base] = base;
601 }
602
603 inline void SysClassPath::add_prefix(const char* prefix) {
604 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
605 }
606
607 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
608 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
609 }
610
611 inline void SysClassPath::add_suffix(const char* suffix) {
612 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
613 }
614
615 inline void SysClassPath::reset_item_at(int index) {
616 assert(index < _scp_nitems && index != _scp_base, "just checking");
617 if (_items[index] != NULL) {
618 FREE_C_HEAP_ARRAY(char, _items[index]);
619 _items[index] = NULL;
620 }
621 }
622
623 inline void SysClassPath::reset_path(const char* base) {
624 // Clear the prefix and suffix.
625 reset_item_at(_scp_prefix);
626 reset_item_at(_scp_suffix);
627 set_base(base);
628 }
629
630 //------------------------------------------------------------------------------
631
632
633 // Combine the bootclasspath elements, some of which may be null, into a single
634 // c-heap-allocated string.
635 char* SysClassPath::combined_path() {
636 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
637
638 size_t lengths[_scp_nitems];
639 size_t total_len = 0;
640
641 const char separator = *os::path_separator();
642
643 // Get the lengths.
644 int i;
645 for (i = 0; i < _scp_nitems; ++i) {
646 if (_items[i] != NULL) {
647 lengths[i] = strlen(_items[i]);
648 // Include space for the separator char (or a NULL for the last item).
649 total_len += lengths[i] + 1;
650 }
651 }
652 assert(total_len > 0, "empty sysclasspath not allowed");
653
654 // Copy the _items to a single string.
655 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
656 char* cp_tmp = cp;
657 for (i = 0; i < _scp_nitems; ++i) {
658 if (_items[i] != NULL) {
659 memcpy(cp_tmp, _items[i], lengths[i]);
660 cp_tmp += lengths[i];
661 *cp_tmp++ = separator;
662 }
663 }
664 *--cp_tmp = '\0'; // Replace the extra separator.
665 return cp;
666 }
667
668 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
669 char*
670 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
671 char *cp;
672
673 assert(str != NULL, "just checking");
674 if (path == NULL) {
675 size_t len = strlen(str) + 1;
676 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
677 memcpy(cp, str, len); // copy the trailing null
678 } else {
679 const char separator = *os::path_separator();
680 size_t old_len = strlen(path);
681 size_t str_len = strlen(str);
682 size_t len = old_len + str_len + 2;
683
684 if (prepend) {
685 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
686 char* cp_tmp = cp;
687 memcpy(cp_tmp, str, str_len);
688 cp_tmp += str_len;
689 *cp_tmp = separator;
690 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
691 FREE_C_HEAP_ARRAY(char, path);
692 } else {
693 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
694 char* cp_tmp = cp + old_len;
695 *cp_tmp = separator;
696 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
697 }
698 }
699 return cp;
700 }
701
702 // Scan the directory and append any jar or zip files found to path.
703 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
704 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
705 DIR* dir = os::opendir(directory);
706 if (dir == NULL) return path;
707
708 char dir_sep[2] = { '\0', '\0' };
709 size_t directory_len = strlen(directory);
710 const char fileSep = *os::file_separator();
711 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
712
713 /* Scan the directory for jars/zips, appending them to path. */
714 struct dirent *entry;
715 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
716 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
717 const char* name = entry->d_name;
718 const char* ext = name + strlen(name) - 4;
719 bool isJarOrZip = ext > name &&
720 (os::file_name_strcmp(ext, ".jar") == 0 ||
721 os::file_name_strcmp(ext, ".zip") == 0);
722 if (isJarOrZip) {
723 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
724 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
725 path = add_to_path(path, jarpath, false);
726 FREE_C_HEAP_ARRAY(char, jarpath);
727 }
728 }
729 FREE_C_HEAP_ARRAY(char, dbuf);
730 os::closedir(dir);
731 return path;
732 }
733
734 // Parses a memory size specification string.
735 static bool atomull(const char *s, julong* result) {
736 julong n = 0;
737 int args_read = 0;
738 bool is_hex = false;
739 // Skip leading 0[xX] for hexadecimal
740 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
741 s += 2;
742 is_hex = true;
743 args_read = sscanf(s, JULONG_FORMAT_X, &n);
744 } else {
745 args_read = sscanf(s, JULONG_FORMAT, &n);
746 }
747 if (args_read != 1) {
748 return false;
749 }
750 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
751 s++;
752 }
753 // 4705540: illegal if more characters are found after the first non-digit
754 if (strlen(s) > 1) {
755 return false;
756 }
757 switch (*s) {
758 case 'T': case 't':
759 *result = n * G * K;
760 // Check for overflow.
761 if (*result/((julong)G * K) != n) return false;
762 return true;
763 case 'G': case 'g':
764 *result = n * G;
765 if (*result/G != n) return false;
766 return true;
767 case 'M': case 'm':
768 *result = n * M;
769 if (*result/M != n) return false;
770 return true;
771 case 'K': case 'k':
772 *result = n * K;
773 if (*result/K != n) return false;
774 return true;
775 case '\0':
776 *result = n;
777 return true;
778 default:
779 return false;
780 }
781 }
782
783 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
784 if (size < min_size) return arg_too_small;
785 // Check that size will fit in a size_t (only relevant on 32-bit)
786 if (size > max_uintx) return arg_too_big;
787 return arg_in_range;
788 }
789
790 // Describe an argument out of range error
791 void Arguments::describe_range_error(ArgsRange errcode) {
792 switch(errcode) {
793 case arg_too_big:
794 jio_fprintf(defaultStream::error_stream(),
795 "The specified size exceeds the maximum "
796 "representable size.\n");
797 break;
798 case arg_too_small:
799 case arg_unreadable:
800 case arg_in_range:
801 // do nothing for now
802 break;
803 default:
804 ShouldNotReachHere();
805 }
806 }
807
808 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
809 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
810 return true;
811 } else {
812 return false;
813 }
814 }
815
816 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
817 char* end;
818 errno = 0;
819 double v = strtod(value, &end);
820 if ((errno != 0) || (*end != 0)) {
821 return false;
822 }
823
824 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
825 return true;
826 }
827 return false;
828 }
829
830 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
831 julong v;
832 int int_v;
833 intx intx_v;
834 bool is_neg = false;
835 Flag* result = Flag::find_flag(name, strlen(name));
836
837 if (result == NULL) {
838 return false;
839 }
840
841 // Check the sign first since atomull() parses only unsigned values.
842 if (*value == '-') {
843 if (!result->is_intx() && !result->is_int()) {
844 return false;
845 }
846 value++;
847 is_neg = true;
848 }
849 if (!atomull(value, &v)) {
850 return false;
851 }
852 if (result->is_int()) {
853 int_v = (int) v;
854 if (is_neg) {
855 int_v = -int_v;
856 }
857 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
858 } else if (result->is_uint()) {
859 uint uint_v = (uint) v;
860 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
861 } else if (result->is_intx()) {
862 intx_v = (intx) v;
863 if (is_neg) {
864 intx_v = -intx_v;
865 }
866 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
867 } else if (result->is_uintx()) {
868 uintx uintx_v = (uintx) v;
869 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
870 } else if (result->is_uint64_t()) {
871 uint64_t uint64_t_v = (uint64_t) v;
872 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
873 } else if (result->is_size_t()) {
874 size_t size_t_v = (size_t) v;
875 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
876 } else {
877 return false;
878 }
879 }
880
881 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
882 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
883 // Contract: CommandLineFlags always returns a pointer that needs freeing.
884 FREE_C_HEAP_ARRAY(char, value);
885 return true;
886 }
887
888 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
889 const char* old_value = "";
890 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
891 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
892 size_t new_len = strlen(new_value);
893 const char* value;
894 char* free_this_too = NULL;
895 if (old_len == 0) {
896 value = new_value;
897 } else if (new_len == 0) {
898 value = old_value;
899 } else {
900 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
901 // each new setting adds another LINE to the switch:
902 sprintf(buf, "%s\n%s", old_value, new_value);
903 value = buf;
904 free_this_too = buf;
905 }
906 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
907 // CommandLineFlags always returns a pointer that needs freeing.
908 FREE_C_HEAP_ARRAY(char, value);
909 if (free_this_too != NULL) {
910 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
911 FREE_C_HEAP_ARRAY(char, free_this_too);
912 }
913 return true;
914 }
915
916 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
917 const char* real_name = real_flag_name(arg);
918 JDK_Version since = JDK_Version();
919 switch (is_deprecated_flag(arg, &since)) {
920 case -1:
921 return NULL; // obsolete or expired, don't process normally
922 case 0:
923 return real_name;
924 case 1: {
925 if (warn) {
926 char version[256];
927 since.to_string(version, sizeof(version));
928 if (real_name != arg) {
929 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
930 arg, version, real_name);
931 } else {
932 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
933 arg, version);
934 }
935 }
936 return real_name;
937 }
938 }
939 ShouldNotReachHere();
940 return NULL;
941 }
942
943 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name){
944 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
945 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
946 if (strcmp(alf.alias_name, name) == 0) {
947 return alf;
948 }
949 }
950 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LogTag::__NO_TAG};
951 return a;
952 }
953
954 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
955
956 // range of acceptable characters spelled out for portability reasons
957 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
958 #define BUFLEN 255
959 char name[BUFLEN+1];
960 char dummy;
961 const char* real_name;
962 bool warn_if_deprecated = true;
963 AliasedLoggingFlag alf;
964
965 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
966 alf = catch_logging_aliases(name);
967 if (alf.alias_name != NULL){
968 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag, LogTag::__NO_TAG);
969 return true;
970 }
971 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
972 if (real_name == NULL) {
973 return false;
974 }
975 return set_bool_flag(real_name, false, origin);
976 }
977 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
978 alf = catch_logging_aliases(name);
979 if (alf.alias_name != NULL){
980 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag, LogTag::__NO_TAG);
981 return true;
982 }
983 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
984 if (real_name == NULL) {
985 return false;
986 }
987 return set_bool_flag(real_name, true, origin);
988 }
989
990 char punct;
991 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
992 const char* value = strchr(arg, '=') + 1;
993 Flag* flag;
994
995 // this scanf pattern matches both strings (handled here) and numbers (handled later))
996 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
997 if (real_name == NULL) {
998 return false;
999 }
1000 flag = Flag::find_flag(real_name);
1001 if (flag != NULL && flag->is_ccstr()) {
1002 if (flag->ccstr_accumulates()) {
1003 return append_to_string_flag(real_name, value, origin);
1004 } else {
1005 if (value[0] == '\0') {
1006 value = NULL;
1007 }
1008 return set_string_flag(real_name, value, origin);
1009 }
1010 } else {
1011 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1012 }
1013 }
1014
1015 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1016 const char* value = strchr(arg, '=') + 1;
1017 // -XX:Foo:=xxx will reset the string flag to the given value.
1018 if (value[0] == '\0') {
1019 value = NULL;
1020 }
1021 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1022 if (real_name == NULL) {
1023 return false;
1024 }
1025 return set_string_flag(real_name, value, origin);
1026 }
1027
1028 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1029 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1030 #define NUMBER_RANGE "[0123456789eE+-]"
1031 char value[BUFLEN + 1];
1032 char value2[BUFLEN + 1];
1033 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1034 // Looks like a floating-point number -- try again with more lenient format string
1035 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1036 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1037 if (real_name == NULL) {
1038 return false;
1039 }
1040 return set_fp_numeric_flag(real_name, value, origin);
1041 }
1042 }
1043
1044 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1045 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1046 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1047 if (real_name == NULL) {
1048 return false;
1049 }
1050 return set_numeric_flag(real_name, value, origin);
1051 }
1052
1053 return false;
1054 }
1055
1056 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1057 assert(bldarray != NULL, "illegal argument");
1058
1059 if (arg == NULL) {
1060 return;
1061 }
1062
1063 int new_count = *count + 1;
1064
1065 // expand the array and add arg to the last element
1066 if (*bldarray == NULL) {
1067 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1068 } else {
1069 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1070 }
1071 (*bldarray)[*count] = os::strdup_check_oom(arg);
1072 *count = new_count;
1073 }
1074
1075 void Arguments::build_jvm_args(const char* arg) {
1076 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1077 }
1078
1079 void Arguments::build_jvm_flags(const char* arg) {
1080 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1081 }
1082
1083 // utility function to return a string that concatenates all
1084 // strings in a given char** array
1085 const char* Arguments::build_resource_string(char** args, int count) {
1086 if (args == NULL || count == 0) {
1087 return NULL;
1088 }
1089 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1090 for (int i = 1; i < count; i++) {
1091 length += strlen(args[i]) + 1; // add 1 for a space
1092 }
1093 char* s = NEW_RESOURCE_ARRAY(char, length);
1094 strcpy(s, args[0]);
1095 for (int j = 1; j < count; j++) {
1096 strcat(s, " ");
1097 strcat(s, args[j]);
1098 }
1099 return (const char*) s;
1100 }
1101
1102 void Arguments::print_on(outputStream* st) {
1103 st->print_cr("VM Arguments:");
1104 if (num_jvm_flags() > 0) {
1105 st->print("jvm_flags: "); print_jvm_flags_on(st);
1106 st->cr();
1107 }
1108 if (num_jvm_args() > 0) {
1109 st->print("jvm_args: "); print_jvm_args_on(st);
1110 st->cr();
1111 }
1112 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1113 if (_java_class_path != NULL) {
1114 char* path = _java_class_path->value();
1115 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1116 }
1117 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1118 }
1119
1120 void Arguments::print_summary_on(outputStream* st) {
1121 // Print the command line. Environment variables that are helpful for
1122 // reproducing the problem are written later in the hs_err file.
1123 // flags are from setting file
1124 if (num_jvm_flags() > 0) {
1125 st->print_raw("Settings File: ");
1126 print_jvm_flags_on(st);
1127 st->cr();
1128 }
1129 // args are the command line and environment variable arguments.
1130 st->print_raw("Command Line: ");
1131 if (num_jvm_args() > 0) {
1132 print_jvm_args_on(st);
1133 }
1134 // this is the classfile and any arguments to the java program
1135 if (java_command() != NULL) {
1136 st->print("%s", java_command());
1137 }
1138 st->cr();
1139 }
1140
1141 void Arguments::print_jvm_flags_on(outputStream* st) {
1142 if (_num_jvm_flags > 0) {
1143 for (int i=0; i < _num_jvm_flags; i++) {
1144 st->print("%s ", _jvm_flags_array[i]);
1145 }
1146 }
1147 }
1148
1149 void Arguments::print_jvm_args_on(outputStream* st) {
1150 if (_num_jvm_args > 0) {
1151 for (int i=0; i < _num_jvm_args; i++) {
1152 st->print("%s ", _jvm_args_array[i]);
1153 }
1154 }
1155 }
1156
1157 bool Arguments::process_argument(const char* arg,
1158 jboolean ignore_unrecognized,
1159 Flag::Flags origin) {
1160 JDK_Version since = JDK_Version();
1161
1162 if (parse_argument(arg, origin)) {
1163 return true;
1164 }
1165
1166 // Determine if the flag has '+', '-', or '=' characters.
1167 bool has_plus_minus = (*arg == '+' || *arg == '-');
1168 const char* const argname = has_plus_minus ? arg + 1 : arg;
1169
1170 size_t arg_len;
1171 const char* equal_sign = strchr(argname, '=');
1172 if (equal_sign == NULL) {
1173 arg_len = strlen(argname);
1174 } else {
1175 arg_len = equal_sign - argname;
1176 }
1177
1178 // Only make the obsolete check for valid arguments.
1179 if (arg_len <= BUFLEN) {
1180 // Construct a string which consists only of the argument name without '+', '-', or '='.
1181 char stripped_argname[BUFLEN+1];
1182 strncpy(stripped_argname, argname, arg_len);
1183 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1184
1185 if (is_obsolete_flag(stripped_argname, &since)) {
1186 char version[256];
1187 since.to_string(version, sizeof(version));
1188 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1189 return true;
1190 }
1191 }
1192
1193 // For locked flags, report a custom error message if available.
1194 // Otherwise, report the standard unrecognized VM option.
1195 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1196 if (found_flag != NULL) {
1197 char locked_message_buf[BUFLEN];
1198 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1199 if (strlen(locked_message_buf) == 0) {
1200 if (found_flag->is_bool() && !has_plus_minus) {
1201 jio_fprintf(defaultStream::error_stream(),
1202 "Missing +/- setting for VM option '%s'\n", argname);
1203 } else if (!found_flag->is_bool() && has_plus_minus) {
1204 jio_fprintf(defaultStream::error_stream(),
1205 "Unexpected +/- setting in VM option '%s'\n", argname);
1206 } else {
1207 jio_fprintf(defaultStream::error_stream(),
1208 "Improperly specified VM option '%s'\n", argname);
1209 }
1210 } else {
1211 #ifdef PRODUCT
1212 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1213 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1214 if (ignore_unrecognized && mismatched) {
1215 return true;
1216 }
1217 #endif
1218 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1219 }
1220 } else {
1221 if (ignore_unrecognized) {
1222 return true;
1223 }
1224 jio_fprintf(defaultStream::error_stream(),
1225 "Unrecognized VM option '%s'\n", argname);
1226 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1227 if (fuzzy_matched != NULL) {
1228 jio_fprintf(defaultStream::error_stream(),
1229 "Did you mean '%s%s%s'? ",
1230 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1231 fuzzy_matched->_name,
1232 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1233 }
1234 }
1235
1236 // allow for commandline "commenting out" options like -XX:#+Verbose
1237 return arg[0] == '#';
1238 }
1239
1240 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1241 FILE* stream = fopen(file_name, "rb");
1242 if (stream == NULL) {
1243 if (should_exist) {
1244 jio_fprintf(defaultStream::error_stream(),
1245 "Could not open settings file %s\n", file_name);
1246 return false;
1247 } else {
1248 return true;
1249 }
1250 }
1251
1252 char token[1024];
1253 int pos = 0;
1254
1255 bool in_white_space = true;
1256 bool in_comment = false;
1257 bool in_quote = false;
1258 char quote_c = 0;
1259 bool result = true;
1260
1261 int c = getc(stream);
1262 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1263 if (in_white_space) {
1264 if (in_comment) {
1265 if (c == '\n') in_comment = false;
1266 } else {
1267 if (c == '#') in_comment = true;
1268 else if (!isspace(c)) {
1269 in_white_space = false;
1270 token[pos++] = c;
1271 }
1272 }
1273 } else {
1274 if (c == '\n' || (!in_quote && isspace(c))) {
1275 // token ends at newline, or at unquoted whitespace
1276 // this allows a way to include spaces in string-valued options
1277 token[pos] = '\0';
1278 logOption(token);
1279 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1280 build_jvm_flags(token);
1281 pos = 0;
1282 in_white_space = true;
1283 in_quote = false;
1284 } else if (!in_quote && (c == '\'' || c == '"')) {
1285 in_quote = true;
1286 quote_c = c;
1287 } else if (in_quote && (c == quote_c)) {
1288 in_quote = false;
1289 } else {
1290 token[pos++] = c;
1291 }
1292 }
1293 c = getc(stream);
1294 }
1295 if (pos > 0) {
1296 token[pos] = '\0';
1297 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1298 build_jvm_flags(token);
1299 }
1300 fclose(stream);
1301 return result;
1302 }
1303
1304 //=============================================================================================================
1305 // Parsing of properties (-D)
1306
1307 const char* Arguments::get_property(const char* key) {
1308 return PropertyList_get_value(system_properties(), key);
1309 }
1310
1311 bool Arguments::add_property(const char* prop) {
1312 const char* eq = strchr(prop, '=');
1313 const char* key;
1314 const char* value = "";
1315
1316 if (eq == NULL) {
1317 // property doesn't have a value, thus use passed string
1318 key = prop;
1319 } else {
1320 // property have a value, thus extract it and save to the
1321 // allocated string
1322 size_t key_len = eq - prop;
1323 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1324
1325 strncpy(tmp_key, prop, key_len);
1326 tmp_key[key_len] = '\0';
1327 key = tmp_key;
1328
1329 value = &prop[key_len + 1];
1330 }
1331
1332 if (strcmp(key, "java.compiler") == 0) {
1333 process_java_compiler_argument(value);
1334 // Record value in Arguments, but let it get passed to Java.
1335 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1336 strcmp(key, "sun.java.launcher.pid") == 0) {
1337 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1338 // private and are processed in process_sun_java_launcher_properties();
1339 // the sun.java.launcher property is passed on to the java application
1340 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1341 PropertyList_unique_add(&_system_properties, key, value, true);
1342 } else {
1343 if (strcmp(key, "sun.java.command") == 0) {
1344 char *old_java_command = _java_command;
1345 _java_command = os::strdup_check_oom(value, mtInternal);
1346 if (old_java_command != NULL) {
1347 os::free(old_java_command);
1348 }
1349 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1350 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1351 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1352 // its value without going through the property list or making a Java call.
1353 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1354 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1355 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1356 os::free((void *)old_java_vendor_url_bug);
1357 }
1358 }
1359
1360 // Create new property and add at the end of the list
1361 PropertyList_unique_add(&_system_properties, key, value);
1362 }
1363
1364 if (key != prop) {
1365 // SystemProperty copy passed value, thus free previously allocated
1366 // memory
1367 FreeHeap((void *)key);
1368 }
1369
1370 return true;
1371 }
1372
1373 //===========================================================================================================
1374 // Setting int/mixed/comp mode flags
1375
1376 void Arguments::set_mode_flags(Mode mode) {
1377 // Set up default values for all flags.
1378 // If you add a flag to any of the branches below,
1379 // add a default value for it here.
1380 set_java_compiler(false);
1381 _mode = mode;
1382
1383 // Ensure Agent_OnLoad has the correct initial values.
1384 // This may not be the final mode; mode may change later in onload phase.
1385 PropertyList_unique_add(&_system_properties, "java.vm.info",
1386 VM_Version::vm_info_string(), false);
1387
1388 UseInterpreter = true;
1389 UseCompiler = true;
1390 UseLoopCounter = true;
1391
1392 // Default values may be platform/compiler dependent -
1393 // use the saved values
1394 ClipInlining = Arguments::_ClipInlining;
1395 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1396 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1397 BackgroundCompilation = Arguments::_BackgroundCompilation;
1398 if (TieredCompilation) {
1399 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1400 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1401 }
1402 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1403 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1404 }
1405 }
1406
1407 // Change from defaults based on mode
1408 switch (mode) {
1409 default:
1410 ShouldNotReachHere();
1411 break;
1412 case _int:
1413 UseCompiler = false;
1414 UseLoopCounter = false;
1415 AlwaysCompileLoopMethods = false;
1416 UseOnStackReplacement = false;
1417 break;
1418 case _mixed:
1419 // same as default
1420 break;
1421 case _comp:
1422 UseInterpreter = false;
1423 BackgroundCompilation = false;
1424 ClipInlining = false;
1425 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1426 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1427 // compile a level 4 (C2) and then continue executing it.
1428 if (TieredCompilation) {
1429 Tier3InvokeNotifyFreqLog = 0;
1430 Tier4InvocationThreshold = 0;
1431 }
1432 break;
1433 }
1434 }
1435
1436 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1437 // Conflict: required to use shared spaces (-Xshare:on), but
1438 // incompatible command line options were chosen.
1439
1440 static void no_shared_spaces(const char* message) {
1441 if (RequireSharedSpaces) {
1442 jio_fprintf(defaultStream::error_stream(),
1443 "Class data sharing is inconsistent with other specified options.\n");
1444 vm_exit_during_initialization("Unable to use shared archive.", message);
1445 } else {
1446 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1447 }
1448 }
1449 #endif
1450
1451 // Returns threshold scaled with the value of scale.
1452 // If scale < 0.0, threshold is returned without scaling.
1453 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1454 if (scale == 1.0 || scale < 0.0) {
1455 return threshold;
1456 } else {
1457 return (intx)(threshold * scale);
1458 }
1459 }
1460
1461 // Returns freq_log scaled with the value of scale.
1462 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1463 // If scale < 0.0, freq_log is returned without scaling.
1464 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1465 // Check if scaling is necessary or if negative value was specified.
1466 if (scale == 1.0 || scale < 0.0) {
1467 return freq_log;
1468 }
1469 // Check values to avoid calculating log2 of 0.
1470 if (scale == 0.0 || freq_log == 0) {
1471 return 0;
1472 }
1473 // Determine the maximum notification frequency value currently supported.
1474 // The largest mask value that the interpreter/C1 can handle is
1475 // of length InvocationCounter::number_of_count_bits. Mask values are always
1476 // one bit shorter then the value of the notification frequency. Set
1477 // max_freq_bits accordingly.
1478 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1479 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1480 if (scaled_freq == 0) {
1481 // Return 0 right away to avoid calculating log2 of 0.
1482 return 0;
1483 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1484 return max_freq_bits;
1485 } else {
1486 return log2_intptr(scaled_freq);
1487 }
1488 }
1489
1490 void Arguments::set_tiered_flags() {
1491 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1492 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1493 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1494 }
1495 if (CompilationPolicyChoice < 2) {
1496 vm_exit_during_initialization(
1497 "Incompatible compilation policy selected", NULL);
1498 }
1499 // Increase the code cache size - tiered compiles a lot more.
1500 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1501 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1502 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1503 }
1504 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1505 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1506 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1507 }
1508 if (!UseInterpreter) { // -Xcomp
1509 Tier3InvokeNotifyFreqLog = 0;
1510 Tier4InvocationThreshold = 0;
1511 }
1512
1513 if (CompileThresholdScaling < 0) {
1514 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1515 }
1516
1517 // Scale tiered compilation thresholds.
1518 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1519 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1520 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1521 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1522
1523 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1524 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1525 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1526 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1527
1528 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1529 // once these thresholds become supported.
1530
1531 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1532 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1533
1534 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1535 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1536
1537 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1538
1539 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1540 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1541 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1542 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1543 }
1544 }
1545
1546 #if INCLUDE_ALL_GCS
1547 static void disable_adaptive_size_policy(const char* collector_name) {
1548 if (UseAdaptiveSizePolicy) {
1549 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1550 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1551 collector_name);
1552 }
1553 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1554 }
1555 }
1556
1557 void Arguments::set_parnew_gc_flags() {
1558 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1559 "control point invariant");
1560 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1561 assert(UseParNewGC, "ParNew should always be used with CMS");
1562
1563 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1564 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1565 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1566 } else if (ParallelGCThreads == 0) {
1567 jio_fprintf(defaultStream::error_stream(),
1568 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1569 vm_exit(1);
1570 }
1571
1572 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1573 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1574 // we set them to 1024 and 1024.
1575 // See CR 6362902.
1576 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1577 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1578 }
1579 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1580 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1581 }
1582
1583 // When using compressed oops, we use local overflow stacks,
1584 // rather than using a global overflow list chained through
1585 // the klass word of the object's pre-image.
1586 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1587 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1588 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1589 }
1590 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1591 }
1592 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1593 }
1594
1595 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1596 // sparc/solaris for certain applications, but would gain from
1597 // further optimization and tuning efforts, and would almost
1598 // certainly gain from analysis of platform and environment.
1599 void Arguments::set_cms_and_parnew_gc_flags() {
1600 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1601 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1602 assert(UseParNewGC, "ParNew should always be used with CMS");
1603
1604 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1605 disable_adaptive_size_policy("UseConcMarkSweepGC");
1606
1607 set_parnew_gc_flags();
1608
1609 size_t max_heap = align_size_down(MaxHeapSize,
1610 CardTableRS::ct_max_alignment_constraint());
1611
1612 // Now make adjustments for CMS
1613 intx tenuring_default = (intx)6;
1614 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1615
1616 // Preferred young gen size for "short" pauses:
1617 // upper bound depends on # of threads and NewRatio.
1618 const size_t preferred_max_new_size_unaligned =
1619 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1620 size_t preferred_max_new_size =
1621 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1622
1623 // Unless explicitly requested otherwise, size young gen
1624 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1625
1626 // If either MaxNewSize or NewRatio is set on the command line,
1627 // assume the user is trying to set the size of the young gen.
1628 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1629
1630 // Set MaxNewSize to our calculated preferred_max_new_size unless
1631 // NewSize was set on the command line and it is larger than
1632 // preferred_max_new_size.
1633 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1634 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1635 } else {
1636 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1637 }
1638 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1639
1640 // Code along this path potentially sets NewSize and OldSize
1641 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1642 min_heap_size(), InitialHeapSize, max_heap);
1643 size_t min_new = preferred_max_new_size;
1644 if (FLAG_IS_CMDLINE(NewSize)) {
1645 min_new = NewSize;
1646 }
1647 if (max_heap > min_new && min_heap_size() > min_new) {
1648 // Unless explicitly requested otherwise, make young gen
1649 // at least min_new, and at most preferred_max_new_size.
1650 if (FLAG_IS_DEFAULT(NewSize)) {
1651 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1652 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1653 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1654 }
1655 // Unless explicitly requested otherwise, size old gen
1656 // so it's NewRatio x of NewSize.
1657 if (FLAG_IS_DEFAULT(OldSize)) {
1658 if (max_heap > NewSize) {
1659 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1660 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1661 }
1662 }
1663 }
1664 }
1665 // Unless explicitly requested otherwise, definitely
1666 // promote all objects surviving "tenuring_default" scavenges.
1667 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1668 FLAG_IS_DEFAULT(SurvivorRatio)) {
1669 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1670 }
1671 // If we decided above (or user explicitly requested)
1672 // `promote all' (via MaxTenuringThreshold := 0),
1673 // prefer minuscule survivor spaces so as not to waste
1674 // space for (non-existent) survivors
1675 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1676 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1677 }
1678
1679 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1680 // but rather the number of free blocks of a given size that are used when
1681 // replenishing the local per-worker free list caches.
1682 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1683 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1684 // OldPLAB sizing manually turned off: Use a larger default setting,
1685 // unless it was manually specified. This is because a too-low value
1686 // will slow down scavenges.
1687 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1688 } else {
1689 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1690 }
1691 }
1692
1693 // If either of the static initialization defaults have changed, note this
1694 // modification.
1695 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1696 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1697 }
1698
1699 if (!ClassUnloading) {
1700 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1701 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1702 }
1703
1704 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1705 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1706 }
1707 #endif // INCLUDE_ALL_GCS
1708
1709 void set_object_alignment() {
1710 // Object alignment.
1711 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1712 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1713 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1714 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1715 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1716 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1717
1718 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1719 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1720
1721 // Oop encoding heap max
1722 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1723
1724 if (SurvivorAlignmentInBytes == 0) {
1725 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1726 }
1727
1728 #if INCLUDE_ALL_GCS
1729 // Set CMS global values
1730 CompactibleFreeListSpace::set_cms_values();
1731 #endif // INCLUDE_ALL_GCS
1732 }
1733
1734 size_t Arguments::max_heap_for_compressed_oops() {
1735 // Avoid sign flip.
1736 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1737 // We need to fit both the NULL page and the heap into the memory budget, while
1738 // keeping alignment constraints of the heap. To guarantee the latter, as the
1739 // NULL page is located before the heap, we pad the NULL page to the conservative
1740 // maximum alignment that the GC may ever impose upon the heap.
1741 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1742 _conservative_max_heap_alignment);
1743
1744 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1745 NOT_LP64(ShouldNotReachHere(); return 0);
1746 }
1747
1748 bool Arguments::should_auto_select_low_pause_collector() {
1749 if (UseAutoGCSelectPolicy &&
1750 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1751 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1752 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1753 return true;
1754 }
1755 return false;
1756 }
1757
1758 void Arguments::set_use_compressed_oops() {
1759 #ifndef ZERO
1760 #ifdef _LP64
1761 // MaxHeapSize is not set up properly at this point, but
1762 // the only value that can override MaxHeapSize if we are
1763 // to use UseCompressedOops is InitialHeapSize.
1764 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1765
1766 if (max_heap_size <= max_heap_for_compressed_oops()) {
1767 #if !defined(COMPILER1) || defined(TIERED)
1768 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1769 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1770 }
1771 #endif
1772 } else {
1773 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1774 warning("Max heap size too large for Compressed Oops");
1775 FLAG_SET_DEFAULT(UseCompressedOops, false);
1776 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1777 }
1778 }
1779 #endif // _LP64
1780 #endif // ZERO
1781 }
1782
1783
1784 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1785 // set_use_compressed_oops().
1786 void Arguments::set_use_compressed_klass_ptrs() {
1787 #ifndef ZERO
1788 #ifdef _LP64
1789 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1790 if (!UseCompressedOops) {
1791 if (UseCompressedClassPointers) {
1792 warning("UseCompressedClassPointers requires UseCompressedOops");
1793 }
1794 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1795 } else {
1796 // Turn on UseCompressedClassPointers too
1797 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1798 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1799 }
1800 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1801 if (UseCompressedClassPointers) {
1802 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1803 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1804 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1805 }
1806 }
1807 }
1808 #endif // _LP64
1809 #endif // !ZERO
1810 }
1811
1812 void Arguments::set_conservative_max_heap_alignment() {
1813 // The conservative maximum required alignment for the heap is the maximum of
1814 // the alignments imposed by several sources: any requirements from the heap
1815 // itself, the collector policy and the maximum page size we may run the VM
1816 // with.
1817 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1818 #if INCLUDE_ALL_GCS
1819 if (UseParallelGC) {
1820 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1821 } else if (UseG1GC) {
1822 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1823 }
1824 #endif // INCLUDE_ALL_GCS
1825 _conservative_max_heap_alignment = MAX4(heap_alignment,
1826 (size_t)os::vm_allocation_granularity(),
1827 os::max_page_size(),
1828 CollectorPolicy::compute_heap_alignment());
1829 }
1830
1831 void Arguments::select_gc_ergonomically() {
1832 if (os::is_server_class_machine()) {
1833 if (should_auto_select_low_pause_collector()) {
1834 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1835 } else {
1836 #if defined(JAVASE_EMBEDDED)
1837 FLAG_SET_ERGO(bool, UseParallelGC, true);
1838 #else
1839 FLAG_SET_ERGO(bool, UseG1GC, true);
1840 #endif
1841 }
1842 } else {
1843 FLAG_SET_ERGO(bool, UseSerialGC, true);
1844 }
1845 }
1846
1847 void Arguments::select_gc() {
1848 if (!gc_selected()) {
1849 select_gc_ergonomically();
1850 guarantee(gc_selected(), "No GC selected");
1851 }
1852 }
1853
1854 void Arguments::set_ergonomics_flags() {
1855 select_gc();
1856
1857 #if defined(COMPILER2) || INCLUDE_JVMCI
1858 // Shared spaces work fine with other GCs but causes bytecode rewriting
1859 // to be disabled, which hurts interpreter performance and decreases
1860 // server performance. When -server is specified, keep the default off
1861 // unless it is asked for. Future work: either add bytecode rewriting
1862 // at link time, or rewrite bytecodes in non-shared methods.
1863 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1864 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1865 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1866 }
1867 #endif
1868
1869 set_conservative_max_heap_alignment();
1870
1871 #ifndef ZERO
1872 #ifdef _LP64
1873 set_use_compressed_oops();
1874
1875 // set_use_compressed_klass_ptrs() must be called after calling
1876 // set_use_compressed_oops().
1877 set_use_compressed_klass_ptrs();
1878
1879 // Also checks that certain machines are slower with compressed oops
1880 // in vm_version initialization code.
1881 #endif // _LP64
1882 #endif // !ZERO
1883
1884 CodeCacheExtensions::set_ergonomics_flags();
1885 }
1886
1887 void Arguments::set_parallel_gc_flags() {
1888 assert(UseParallelGC || UseParallelOldGC, "Error");
1889 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1890 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1891 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1892 }
1893 FLAG_SET_DEFAULT(UseParallelGC, true);
1894
1895 // If no heap maximum was requested explicitly, use some reasonable fraction
1896 // of the physical memory, up to a maximum of 1GB.
1897 FLAG_SET_DEFAULT(ParallelGCThreads,
1898 Abstract_VM_Version::parallel_worker_threads());
1899 if (ParallelGCThreads == 0) {
1900 jio_fprintf(defaultStream::error_stream(),
1901 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1902 vm_exit(1);
1903 }
1904
1905 if (UseAdaptiveSizePolicy) {
1906 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1907 // unless the user actually sets these flags.
1908 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1909 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1910 }
1911 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1912 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1913 }
1914 }
1915
1916 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1917 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1918 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1919 // See CR 6362902 for details.
1920 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1921 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1922 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1923 }
1924 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1925 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1926 }
1927 }
1928
1929 if (UseParallelOldGC) {
1930 // Par compact uses lower default values since they are treated as
1931 // minimums. These are different defaults because of the different
1932 // interpretation and are not ergonomically set.
1933 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1934 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1935 }
1936 }
1937 }
1938
1939 void Arguments::set_g1_gc_flags() {
1940 assert(UseG1GC, "Error");
1941 #if defined(COMPILER1) || INCLUDE_JVMCI
1942 FastTLABRefill = false;
1943 #endif
1944 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1945 if (ParallelGCThreads == 0) {
1946 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1947 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1948 }
1949
1950 #if INCLUDE_ALL_GCS
1951 if (G1ConcRefinementThreads == 0) {
1952 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1953 }
1954 #endif
1955
1956 // MarkStackSize will be set (if it hasn't been set by the user)
1957 // when concurrent marking is initialized.
1958 // Its value will be based upon the number of parallel marking threads.
1959 // But we do set the maximum mark stack size here.
1960 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1961 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1962 }
1963
1964 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1965 // In G1, we want the default GC overhead goal to be higher than
1966 // it is for PS, or the heap might be expanded too aggressively.
1967 // We set it here to ~8%.
1968 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1969 }
1970
1971 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1972 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1973 }
1974
1975 #if !INCLUDE_ALL_GCS
1976 #ifdef ASSERT
1977 static bool verify_serial_gc_flags() {
1978 return (UseSerialGC &&
1979 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1980 UseParallelGC || UseParallelOldGC));
1981 }
1982 #endif // ASSERT
1983 #endif // INCLUDE_ALL_GCS
1984
1985 void Arguments::set_gc_specific_flags() {
1986 #if INCLUDE_ALL_GCS
1987 // Set per-collector flags
1988 if (UseParallelGC || UseParallelOldGC) {
1989 set_parallel_gc_flags();
1990 } else if (UseConcMarkSweepGC) {
1991 set_cms_and_parnew_gc_flags();
1992 } else if (UseG1GC) {
1993 set_g1_gc_flags();
1994 }
1995 if (AssumeMP && !UseSerialGC) {
1996 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1997 warning("If the number of processors is expected to increase from one, then"
1998 " you should configure the number of parallel GC threads appropriately"
1999 " using -XX:ParallelGCThreads=N");
2000 }
2001 }
2002 if (MinHeapFreeRatio == 100) {
2003 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2004 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2005 }
2006 #else // INCLUDE_ALL_GCS
2007 assert(verify_serial_gc_flags(), "SerialGC unset");
2008 #endif // INCLUDE_ALL_GCS
2009 }
2010
2011 julong Arguments::limit_by_allocatable_memory(julong limit) {
2012 julong max_allocatable;
2013 julong result = limit;
2014 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2015 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2016 }
2017 return result;
2018 }
2019
2020 // Use static initialization to get the default before parsing
2021 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2022
2023 void Arguments::set_heap_size() {
2024 const julong phys_mem =
2025 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2026 : (julong)MaxRAM;
2027
2028 // If the maximum heap size has not been set with -Xmx,
2029 // then set it as fraction of the size of physical memory,
2030 // respecting the maximum and minimum sizes of the heap.
2031 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2032 julong reasonable_max = phys_mem / MaxRAMFraction;
2033
2034 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2035 // Small physical memory, so use a minimum fraction of it for the heap
2036 reasonable_max = phys_mem / MinRAMFraction;
2037 } else {
2038 // Not-small physical memory, so require a heap at least
2039 // as large as MaxHeapSize
2040 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2041 }
2042 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2043 // Limit the heap size to ErgoHeapSizeLimit
2044 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2045 }
2046 if (UseCompressedOops) {
2047 // Limit the heap size to the maximum possible when using compressed oops
2048 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2049
2050 // HeapBaseMinAddress can be greater than default but not less than.
2051 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2052 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2053 // matches compressed oops printing flags
2054 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2055 jio_fprintf(defaultStream::error_stream(),
2056 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2057 " (" SIZE_FORMAT "G) which is greater than value given "
2058 SIZE_FORMAT "\n",
2059 DefaultHeapBaseMinAddress,
2060 DefaultHeapBaseMinAddress/G,
2061 HeapBaseMinAddress);
2062 }
2063 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2064 }
2065 }
2066
2067 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2068 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2069 // but it should be not less than default MaxHeapSize.
2070 max_coop_heap -= HeapBaseMinAddress;
2071 }
2072 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2073 }
2074 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2075
2076 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2077 // An initial heap size was specified on the command line,
2078 // so be sure that the maximum size is consistent. Done
2079 // after call to limit_by_allocatable_memory because that
2080 // method might reduce the allocation size.
2081 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2082 }
2083
2084 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2085 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2086 }
2087
2088 // If the minimum or initial heap_size have not been set or requested to be set
2089 // ergonomically, set them accordingly.
2090 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2091 julong reasonable_minimum = (julong)(OldSize + NewSize);
2092
2093 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2094
2095 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2096
2097 if (InitialHeapSize == 0) {
2098 julong reasonable_initial = phys_mem / InitialRAMFraction;
2099
2100 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2101 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2102
2103 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2104
2105 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2106 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2107 }
2108 // If the minimum heap size has not been set (via -Xms),
2109 // synchronize with InitialHeapSize to avoid errors with the default value.
2110 if (min_heap_size() == 0) {
2111 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2112 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2113 }
2114 }
2115 }
2116
2117 // This option inspects the machine and attempts to set various
2118 // parameters to be optimal for long-running, memory allocation
2119 // intensive jobs. It is intended for machines with large
2120 // amounts of cpu and memory.
2121 jint Arguments::set_aggressive_heap_flags() {
2122 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2123 // VM, but we may not be able to represent the total physical memory
2124 // available (like having 8gb of memory on a box but using a 32bit VM).
2125 // Thus, we need to make sure we're using a julong for intermediate
2126 // calculations.
2127 julong initHeapSize;
2128 julong total_memory = os::physical_memory();
2129
2130 if (total_memory < (julong) 256 * M) {
2131 jio_fprintf(defaultStream::error_stream(),
2132 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2133 vm_exit(1);
2134 }
2135
2136 // The heap size is half of available memory, or (at most)
2137 // all of possible memory less 160mb (leaving room for the OS
2138 // when using ISM). This is the maximum; because adaptive sizing
2139 // is turned on below, the actual space used may be smaller.
2140
2141 initHeapSize = MIN2(total_memory / (julong) 2,
2142 total_memory - (julong) 160 * M);
2143
2144 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2145
2146 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2147 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2148 return JNI_EINVAL;
2149 }
2150 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2151 return JNI_EINVAL;
2152 }
2153 // Currently the minimum size and the initial heap sizes are the same.
2154 set_min_heap_size(initHeapSize);
2155 }
2156 if (FLAG_IS_DEFAULT(NewSize)) {
2157 // Make the young generation 3/8ths of the total heap.
2158 if (FLAG_SET_CMDLINE(size_t, NewSize,
2159 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2160 return JNI_EINVAL;
2161 }
2162 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2163 return JNI_EINVAL;
2164 }
2165 }
2166
2167 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2168 FLAG_SET_DEFAULT(UseLargePages, true);
2169 #endif
2170
2171 // Increase some data structure sizes for efficiency
2172 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2173 return JNI_EINVAL;
2174 }
2175 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2176 return JNI_EINVAL;
2177 }
2178 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2179 return JNI_EINVAL;
2180 }
2181
2182 // See the OldPLABSize comment below, but replace 'after promotion'
2183 // with 'after copying'. YoungPLABSize is the size of the survivor
2184 // space per-gc-thread buffers. The default is 4kw.
2185 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2186 return JNI_EINVAL;
2187 }
2188
2189 // OldPLABSize is the size of the buffers in the old gen that
2190 // UseParallelGC uses to promote live data that doesn't fit in the
2191 // survivor spaces. At any given time, there's one for each gc thread.
2192 // The default size is 1kw. These buffers are rarely used, since the
2193 // survivor spaces are usually big enough. For specjbb, however, there
2194 // are occasions when there's lots of live data in the young gen
2195 // and we end up promoting some of it. We don't have a definite
2196 // explanation for why bumping OldPLABSize helps, but the theory
2197 // is that a bigger PLAB results in retaining something like the
2198 // original allocation order after promotion, which improves mutator
2199 // locality. A minor effect may be that larger PLABs reduce the
2200 // number of PLAB allocation events during gc. The value of 8kw
2201 // was arrived at by experimenting with specjbb.
2202 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2203 return JNI_EINVAL;
2204 }
2205
2206 // Enable parallel GC and adaptive generation sizing
2207 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2208 return JNI_EINVAL;
2209 }
2210 FLAG_SET_DEFAULT(ParallelGCThreads,
2211 Abstract_VM_Version::parallel_worker_threads());
2212
2213 // Encourage steady state memory management
2214 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2215 return JNI_EINVAL;
2216 }
2217
2218 // This appears to improve mutator locality
2219 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2220 return JNI_EINVAL;
2221 }
2222
2223 // Get around early Solaris scheduling bug
2224 // (affinity vs other jobs on system)
2225 // but disallow DR and offlining (5008695).
2226 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2227 return JNI_EINVAL;
2228 }
2229
2230 return JNI_OK;
2231 }
2232
2233 // This must be called after ergonomics.
2234 void Arguments::set_bytecode_flags() {
2235 if (!RewriteBytecodes) {
2236 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2237 }
2238 }
2239
2240 // Aggressive optimization flags -XX:+AggressiveOpts
2241 jint Arguments::set_aggressive_opts_flags() {
2242 #ifdef COMPILER2
2243 if (AggressiveUnboxing) {
2244 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2245 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2246 } else if (!EliminateAutoBox) {
2247 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2248 AggressiveUnboxing = false;
2249 }
2250 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2251 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2252 } else if (!DoEscapeAnalysis) {
2253 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2254 AggressiveUnboxing = false;
2255 }
2256 }
2257 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2258 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2259 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2260 }
2261 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2262 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2263 }
2264
2265 // Feed the cache size setting into the JDK
2266 char buffer[1024];
2267 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2268 if (!add_property(buffer)) {
2269 return JNI_ENOMEM;
2270 }
2271 }
2272 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2273 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2274 }
2275 #endif
2276
2277 if (AggressiveOpts) {
2278 // Sample flag setting code
2279 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2280 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2281 // }
2282 }
2283
2284 return JNI_OK;
2285 }
2286
2287 //===========================================================================================================
2288 // Parsing of java.compiler property
2289
2290 void Arguments::process_java_compiler_argument(const char* arg) {
2291 // For backwards compatibility, Djava.compiler=NONE or ""
2292 // causes us to switch to -Xint mode UNLESS -Xdebug
2293 // is also specified.
2294 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2295 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2296 }
2297 }
2298
2299 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2300 _sun_java_launcher = os::strdup_check_oom(launcher);
2301 }
2302
2303 bool Arguments::created_by_java_launcher() {
2304 assert(_sun_java_launcher != NULL, "property must have value");
2305 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2306 }
2307
2308 bool Arguments::sun_java_launcher_is_altjvm() {
2309 return _sun_java_launcher_is_altjvm;
2310 }
2311
2312 //===========================================================================================================
2313 // Parsing of main arguments
2314
2315 // Check consistency of GC selection
2316 bool Arguments::check_gc_consistency() {
2317 // Ensure that the user has not selected conflicting sets
2318 // of collectors.
2319 uint i = 0;
2320 if (UseSerialGC) i++;
2321 if (UseConcMarkSweepGC) i++;
2322 if (UseParallelGC || UseParallelOldGC) i++;
2323 if (UseG1GC) i++;
2324 if (i > 1) {
2325 jio_fprintf(defaultStream::error_stream(),
2326 "Conflicting collector combinations in option list; "
2327 "please refer to the release notes for the combinations "
2328 "allowed\n");
2329 return false;
2330 }
2331
2332 if (UseConcMarkSweepGC && !UseParNewGC) {
2333 jio_fprintf(defaultStream::error_stream(),
2334 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2335 return false;
2336 }
2337
2338 if (UseParNewGC && !UseConcMarkSweepGC) {
2339 jio_fprintf(defaultStream::error_stream(),
2340 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2341 return false;
2342 }
2343
2344 return true;
2345 }
2346
2347 // Check the consistency of vm_init_args
2348 bool Arguments::check_vm_args_consistency() {
2349 // Method for adding checks for flag consistency.
2350 // The intent is to warn the user of all possible conflicts,
2351 // before returning an error.
2352 // Note: Needs platform-dependent factoring.
2353 bool status = true;
2354
2355 if (TLABRefillWasteFraction == 0) {
2356 jio_fprintf(defaultStream::error_stream(),
2357 "TLABRefillWasteFraction should be a denominator, "
2358 "not " SIZE_FORMAT "\n",
2359 TLABRefillWasteFraction);
2360 status = false;
2361 }
2362
2363 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2364 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2365 }
2366
2367 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2368 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2369 }
2370
2371 if (GCTimeLimit == 100) {
2372 // Turn off gc-overhead-limit-exceeded checks
2373 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2374 }
2375
2376 status = status && check_gc_consistency();
2377
2378 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2379 // insists that we hold the requisite locks so that the iteration is
2380 // MT-safe. For the verification at start-up and shut-down, we don't
2381 // yet have a good way of acquiring and releasing these locks,
2382 // which are not visible at the CollectedHeap level. We want to
2383 // be able to acquire these locks and then do the iteration rather
2384 // than just disable the lock verification. This will be fixed under
2385 // bug 4788986.
2386 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2387 if (VerifyDuringStartup) {
2388 warning("Heap verification at start-up disabled "
2389 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2390 VerifyDuringStartup = false; // Disable verification at start-up
2391 }
2392
2393 if (VerifyBeforeExit) {
2394 warning("Heap verification at shutdown disabled "
2395 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2396 VerifyBeforeExit = false; // Disable verification at shutdown
2397 }
2398 }
2399
2400 if (PrintNMTStatistics) {
2401 #if INCLUDE_NMT
2402 if (MemTracker::tracking_level() == NMT_off) {
2403 #endif // INCLUDE_NMT
2404 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2405 PrintNMTStatistics = false;
2406 #if INCLUDE_NMT
2407 }
2408 #endif
2409 }
2410 #if INCLUDE_JVMCI
2411 if (EnableJVMCI) {
2412 if (!ScavengeRootsInCode) {
2413 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2414 ScavengeRootsInCode = 1;
2415 }
2416 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2417 TypeProfileLevel = 0;
2418 }
2419 if (UseJVMCICompiler) {
2420 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2421 TypeProfileWidth = 8;
2422 }
2423 }
2424 }
2425 #endif
2426
2427 // Check lower bounds of the code cache
2428 // Template Interpreter code is approximately 3X larger in debug builds.
2429 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2430 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2431 jio_fprintf(defaultStream::error_stream(),
2432 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2433 os::vm_page_size()/K);
2434 status = false;
2435 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2438 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2439 status = false;
2440 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2441 jio_fprintf(defaultStream::error_stream(),
2442 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2443 min_code_cache_size/K);
2444 status = false;
2445 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2446 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2447 jio_fprintf(defaultStream::error_stream(),
2448 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2449 CODE_CACHE_SIZE_LIMIT/M);
2450 status = false;
2451 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2452 jio_fprintf(defaultStream::error_stream(),
2453 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2454 min_code_cache_size/K);
2455 status = false;
2456 }
2457
2458 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2459 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2460 }
2461
2462 #ifndef SUPPORT_RESERVED_STACK_AREA
2463 if (StackReservedPages != 0) {
2464 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2465 warning("Reserved Stack Area not supported on this platform");
2466 }
2467 #endif
2468 return status;
2469 }
2470
2471 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2472 const char* option_type) {
2473 if (ignore) return false;
2474
2475 const char* spacer = " ";
2476 if (option_type == NULL) {
2477 option_type = ++spacer; // Set both to the empty string.
2478 }
2479
2480 if (os::obsolete_option(option)) {
2481 jio_fprintf(defaultStream::error_stream(),
2482 "Obsolete %s%soption: %s\n", option_type, spacer,
2483 option->optionString);
2484 return false;
2485 } else {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Unrecognized %s%soption: %s\n", option_type, spacer,
2488 option->optionString);
2489 return true;
2490 }
2491 }
2492
2493 static const char* user_assertion_options[] = {
2494 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2495 };
2496
2497 static const char* system_assertion_options[] = {
2498 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2499 };
2500
2501 bool Arguments::parse_uintx(const char* value,
2502 uintx* uintx_arg,
2503 uintx min_size) {
2504
2505 // Check the sign first since atomull() parses only unsigned values.
2506 bool value_is_positive = !(*value == '-');
2507
2508 if (value_is_positive) {
2509 julong n;
2510 bool good_return = atomull(value, &n);
2511 if (good_return) {
2512 bool above_minimum = n >= min_size;
2513 bool value_is_too_large = n > max_uintx;
2514
2515 if (above_minimum && !value_is_too_large) {
2516 *uintx_arg = n;
2517 return true;
2518 }
2519 }
2520 }
2521 return false;
2522 }
2523
2524 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2525 julong* long_arg,
2526 julong min_size) {
2527 if (!atomull(s, long_arg)) return arg_unreadable;
2528 return check_memory_size(*long_arg, min_size);
2529 }
2530
2531 // Parse JavaVMInitArgs structure
2532
2533 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2534 const JavaVMInitArgs *java_options_args,
2535 const JavaVMInitArgs *cmd_line_args) {
2536 // For components of the system classpath.
2537 SysClassPath scp(Arguments::get_sysclasspath());
2538 bool scp_assembly_required = false;
2539
2540 // Save default settings for some mode flags
2541 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2542 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2543 Arguments::_ClipInlining = ClipInlining;
2544 Arguments::_BackgroundCompilation = BackgroundCompilation;
2545 if (TieredCompilation) {
2546 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2547 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2548 }
2549
2550 // Setup flags for mixed which is the default
2551 set_mode_flags(_mixed);
2552
2553 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2554 // variable (if present).
2555 jint result = parse_each_vm_init_arg(
2556 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2557 if (result != JNI_OK) {
2558 return result;
2559 }
2560
2561 // Parse args structure generated from the command line flags.
2562 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2563 Flag::COMMAND_LINE);
2564 if (result != JNI_OK) {
2565 return result;
2566 }
2567
2568 // Parse args structure generated from the _JAVA_OPTIONS environment
2569 // variable (if present) (mimics classic VM)
2570 result = parse_each_vm_init_arg(
2571 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2572 if (result != JNI_OK) {
2573 return result;
2574 }
2575
2576 // Do final processing now that all arguments have been parsed
2577 result = finalize_vm_init_args(&scp, scp_assembly_required);
2578 if (result != JNI_OK) {
2579 return result;
2580 }
2581
2582 return JNI_OK;
2583 }
2584
2585 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2586 // represents a valid JDWP agent. is_path==true denotes that we
2587 // are dealing with -agentpath (case where name is a path), otherwise with
2588 // -agentlib
2589 bool valid_jdwp_agent(char *name, bool is_path) {
2590 char *_name;
2591 const char *_jdwp = "jdwp";
2592 size_t _len_jdwp, _len_prefix;
2593
2594 if (is_path) {
2595 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2596 return false;
2597 }
2598
2599 _name++; // skip past last path separator
2600 _len_prefix = strlen(JNI_LIB_PREFIX);
2601
2602 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2603 return false;
2604 }
2605
2606 _name += _len_prefix;
2607 _len_jdwp = strlen(_jdwp);
2608
2609 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2610 _name += _len_jdwp;
2611 }
2612 else {
2613 return false;
2614 }
2615
2616 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2617 return false;
2618 }
2619
2620 return true;
2621 }
2622
2623 if (strcmp(name, _jdwp) == 0) {
2624 return true;
2625 }
2626
2627 return false;
2628 }
2629
2630 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2631 SysClassPath* scp_p,
2632 bool* scp_assembly_required_p,
2633 Flag::Flags origin) {
2634 // For match_option to return remaining or value part of option string
2635 const char* tail;
2636
2637 // iterate over arguments
2638 for (int index = 0; index < args->nOptions; index++) {
2639 bool is_absolute_path = false; // for -agentpath vs -agentlib
2640
2641 const JavaVMOption* option = args->options + index;
2642
2643 if (!match_option(option, "-Djava.class.path", &tail) &&
2644 !match_option(option, "-Dsun.java.command", &tail) &&
2645 !match_option(option, "-Dsun.java.launcher", &tail)) {
2646
2647 // add all jvm options to the jvm_args string. This string
2648 // is used later to set the java.vm.args PerfData string constant.
2649 // the -Djava.class.path and the -Dsun.java.command options are
2650 // omitted from jvm_args string as each have their own PerfData
2651 // string constant object.
2652 build_jvm_args(option->optionString);
2653 }
2654
2655 // -verbose:[class/gc/jni]
2656 if (match_option(option, "-verbose", &tail)) {
2657 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2658 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload));
2659 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload));
2660 } else if (!strcmp(tail, ":gc")) {
2661 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2662 } else if (!strcmp(tail, ":jni")) {
2663 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 }
2667 // -da / -ea / -disableassertions / -enableassertions
2668 // These accept an optional class/package name separated by a colon, e.g.,
2669 // -da:java.lang.Thread.
2670 } else if (match_option(option, user_assertion_options, &tail, true)) {
2671 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2672 if (*tail == '\0') {
2673 JavaAssertions::setUserClassDefault(enable);
2674 } else {
2675 assert(*tail == ':', "bogus match by match_option()");
2676 JavaAssertions::addOption(tail + 1, enable);
2677 }
2678 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2679 } else if (match_option(option, system_assertion_options, &tail, false)) {
2680 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2681 JavaAssertions::setSystemClassDefault(enable);
2682 // -bootclasspath:
2683 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2684 scp_p->reset_path(tail);
2685 *scp_assembly_required_p = true;
2686 // -bootclasspath/a:
2687 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2688 scp_p->add_suffix(tail);
2689 *scp_assembly_required_p = true;
2690 // -bootclasspath/p:
2691 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2692 scp_p->add_prefix(tail);
2693 *scp_assembly_required_p = true;
2694 // -Xrun
2695 } else if (match_option(option, "-Xrun", &tail)) {
2696 if (tail != NULL) {
2697 const char* pos = strchr(tail, ':');
2698 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2699 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2700 name[len] = '\0';
2701
2702 char *options = NULL;
2703 if(pos != NULL) {
2704 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2705 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2706 }
2707 #if !INCLUDE_JVMTI
2708 if (strcmp(name, "jdwp") == 0) {
2709 jio_fprintf(defaultStream::error_stream(),
2710 "Debugging agents are not supported in this VM\n");
2711 return JNI_ERR;
2712 }
2713 #endif // !INCLUDE_JVMTI
2714 add_init_library(name, options);
2715 }
2716 // -agentlib and -agentpath
2717 } else if (match_option(option, "-agentlib:", &tail) ||
2718 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2719 if(tail != NULL) {
2720 const char* pos = strchr(tail, '=');
2721 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2722 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2723 name[len] = '\0';
2724
2725 char *options = NULL;
2726 if(pos != NULL) {
2727 options = os::strdup_check_oom(pos + 1, mtInternal);
2728 }
2729 #if !INCLUDE_JVMTI
2730 if (valid_jdwp_agent(name, is_absolute_path)) {
2731 jio_fprintf(defaultStream::error_stream(),
2732 "Debugging agents are not supported in this VM\n");
2733 return JNI_ERR;
2734 }
2735 #endif // !INCLUDE_JVMTI
2736 add_init_agent(name, options, is_absolute_path);
2737 }
2738 // -javaagent
2739 } else if (match_option(option, "-javaagent:", &tail)) {
2740 #if !INCLUDE_JVMTI
2741 jio_fprintf(defaultStream::error_stream(),
2742 "Instrumentation agents are not supported in this VM\n");
2743 return JNI_ERR;
2744 #else
2745 if(tail != NULL) {
2746 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2747 add_init_agent("instrument", options, false);
2748 }
2749 #endif // !INCLUDE_JVMTI
2750 // -Xnoclassgc
2751 } else if (match_option(option, "-Xnoclassgc")) {
2752 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 // -Xconcgc
2756 } else if (match_option(option, "-Xconcgc")) {
2757 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 // -Xnoconcgc
2761 } else if (match_option(option, "-Xnoconcgc")) {
2762 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 // -Xbatch
2766 } else if (match_option(option, "-Xbatch")) {
2767 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 // -Xmn for compatibility with other JVM vendors
2771 } else if (match_option(option, "-Xmn", &tail)) {
2772 julong long_initial_young_size = 0;
2773 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2774 if (errcode != arg_in_range) {
2775 jio_fprintf(defaultStream::error_stream(),
2776 "Invalid initial young generation size: %s\n", option->optionString);
2777 describe_range_error(errcode);
2778 return JNI_EINVAL;
2779 }
2780 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 // -Xms
2787 } else if (match_option(option, "-Xms", &tail)) {
2788 julong long_initial_heap_size = 0;
2789 // an initial heap size of 0 means automatically determine
2790 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2791 if (errcode != arg_in_range) {
2792 jio_fprintf(defaultStream::error_stream(),
2793 "Invalid initial heap size: %s\n", option->optionString);
2794 describe_range_error(errcode);
2795 return JNI_EINVAL;
2796 }
2797 set_min_heap_size((size_t)long_initial_heap_size);
2798 // Currently the minimum size and the initial heap sizes are the same.
2799 // Can be overridden with -XX:InitialHeapSize.
2800 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2801 return JNI_EINVAL;
2802 }
2803 // -Xmx
2804 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2805 julong long_max_heap_size = 0;
2806 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2807 if (errcode != arg_in_range) {
2808 jio_fprintf(defaultStream::error_stream(),
2809 "Invalid maximum heap size: %s\n", option->optionString);
2810 describe_range_error(errcode);
2811 return JNI_EINVAL;
2812 }
2813 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2814 return JNI_EINVAL;
2815 }
2816 // Xmaxf
2817 } else if (match_option(option, "-Xmaxf", &tail)) {
2818 char* err;
2819 int maxf = (int)(strtod(tail, &err) * 100);
2820 if (*err != '\0' || *tail == '\0') {
2821 jio_fprintf(defaultStream::error_stream(),
2822 "Bad max heap free percentage size: %s\n",
2823 option->optionString);
2824 return JNI_EINVAL;
2825 } else {
2826 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2827 return JNI_EINVAL;
2828 }
2829 }
2830 // Xminf
2831 } else if (match_option(option, "-Xminf", &tail)) {
2832 char* err;
2833 int minf = (int)(strtod(tail, &err) * 100);
2834 if (*err != '\0' || *tail == '\0') {
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Bad min heap free percentage size: %s\n",
2837 option->optionString);
2838 return JNI_EINVAL;
2839 } else {
2840 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2841 return JNI_EINVAL;
2842 }
2843 }
2844 // -Xss
2845 } else if (match_option(option, "-Xss", &tail)) {
2846 julong long_ThreadStackSize = 0;
2847 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2848 if (errcode != arg_in_range) {
2849 jio_fprintf(defaultStream::error_stream(),
2850 "Invalid thread stack size: %s\n", option->optionString);
2851 describe_range_error(errcode);
2852 return JNI_EINVAL;
2853 }
2854 // Internally track ThreadStackSize in units of 1024 bytes.
2855 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2856 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2857 return JNI_EINVAL;
2858 }
2859 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2860 } else if (match_option(option, "-Xoss", &tail) ||
2861 match_option(option, "-Xsqnopause") ||
2862 match_option(option, "-Xoptimize") ||
2863 match_option(option, "-Xboundthreads") ||
2864 match_option(option, "-Xusealtsigs")) {
2865 // All these options are deprecated in JDK 9 and will be removed in a future release
2866 char version[256];
2867 JDK_Version::jdk(9).to_string(version, sizeof(version));
2868 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2869 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2870 julong long_CodeCacheExpansionSize = 0;
2871 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2872 if (errcode != arg_in_range) {
2873 jio_fprintf(defaultStream::error_stream(),
2874 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2875 os::vm_page_size()/K);
2876 return JNI_EINVAL;
2877 }
2878 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2879 return JNI_EINVAL;
2880 }
2881 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2882 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2883 julong long_ReservedCodeCacheSize = 0;
2884
2885 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2886 if (errcode != arg_in_range) {
2887 jio_fprintf(defaultStream::error_stream(),
2888 "Invalid maximum code cache size: %s.\n", option->optionString);
2889 return JNI_EINVAL;
2890 }
2891 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 // -XX:NonNMethodCodeHeapSize=
2895 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2896 julong long_NonNMethodCodeHeapSize = 0;
2897
2898 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2899 if (errcode != arg_in_range) {
2900 jio_fprintf(defaultStream::error_stream(),
2901 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2902 return JNI_EINVAL;
2903 }
2904 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 // -XX:ProfiledCodeHeapSize=
2908 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2909 julong long_ProfiledCodeHeapSize = 0;
2910
2911 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2912 if (errcode != arg_in_range) {
2913 jio_fprintf(defaultStream::error_stream(),
2914 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2915 return JNI_EINVAL;
2916 }
2917 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 // -XX:NonProfiledCodeHeapSizee=
2921 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2922 julong long_NonProfiledCodeHeapSize = 0;
2923
2924 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2925 if (errcode != arg_in_range) {
2926 jio_fprintf(defaultStream::error_stream(),
2927 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2928 return JNI_EINVAL;
2929 }
2930 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2931 return JNI_EINVAL;
2932 }
2933 // -green
2934 } else if (match_option(option, "-green")) {
2935 jio_fprintf(defaultStream::error_stream(),
2936 "Green threads support not available\n");
2937 return JNI_EINVAL;
2938 // -native
2939 } else if (match_option(option, "-native")) {
2940 // HotSpot always uses native threads, ignore silently for compatibility
2941 // -Xrs
2942 } else if (match_option(option, "-Xrs")) {
2943 // Classic/EVM option, new functionality
2944 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2945 return JNI_EINVAL;
2946 }
2947 // -Xprof
2948 } else if (match_option(option, "-Xprof")) {
2949 #if INCLUDE_FPROF
2950 _has_profile = true;
2951 #else // INCLUDE_FPROF
2952 jio_fprintf(defaultStream::error_stream(),
2953 "Flat profiling is not supported in this VM.\n");
2954 return JNI_ERR;
2955 #endif // INCLUDE_FPROF
2956 // -Xconcurrentio
2957 } else if (match_option(option, "-Xconcurrentio")) {
2958 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2965 return JNI_EINVAL;
2966 }
2967 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2968 return JNI_EINVAL;
2969 }
2970 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2971 return JNI_EINVAL;
2972 }
2973
2974 // -Xinternalversion
2975 } else if (match_option(option, "-Xinternalversion")) {
2976 jio_fprintf(defaultStream::output_stream(), "%s\n",
2977 VM_Version::internal_vm_info_string());
2978 vm_exit(0);
2979 #ifndef PRODUCT
2980 // -Xprintflags
2981 } else if (match_option(option, "-Xprintflags")) {
2982 CommandLineFlags::printFlags(tty, false);
2983 vm_exit(0);
2984 #endif
2985 // -D
2986 } else if (match_option(option, "-D", &tail)) {
2987 const char* value;
2988 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2989 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2990 // abort if -Djava.endorsed.dirs is set
2991 jio_fprintf(defaultStream::output_stream(),
2992 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2993 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2994 return JNI_EINVAL;
2995 }
2996 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2997 *value != '\0' && strcmp(value, "\"\"") != 0) {
2998 // abort if -Djava.ext.dirs is set
2999 jio_fprintf(defaultStream::output_stream(),
3000 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3001 return JNI_EINVAL;
3002 }
3003
3004 if (!add_property(tail)) {
3005 return JNI_ENOMEM;
3006 }
3007 // Out of the box management support
3008 if (match_option(option, "-Dcom.sun.management", &tail)) {
3009 #if INCLUDE_MANAGEMENT
3010 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3011 return JNI_EINVAL;
3012 }
3013 #else
3014 jio_fprintf(defaultStream::output_stream(),
3015 "-Dcom.sun.management is not supported in this VM.\n");
3016 return JNI_ERR;
3017 #endif
3018 }
3019 // -Xint
3020 } else if (match_option(option, "-Xint")) {
3021 set_mode_flags(_int);
3022 // -Xmixed
3023 } else if (match_option(option, "-Xmixed")) {
3024 set_mode_flags(_mixed);
3025 // -Xcomp
3026 } else if (match_option(option, "-Xcomp")) {
3027 // for testing the compiler; turn off all flags that inhibit compilation
3028 set_mode_flags(_comp);
3029 // -Xshare:dump
3030 } else if (match_option(option, "-Xshare:dump")) {
3031 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3032 return JNI_EINVAL;
3033 }
3034 set_mode_flags(_int); // Prevent compilation, which creates objects
3035 // -Xshare:on
3036 } else if (match_option(option, "-Xshare:on")) {
3037 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3038 return JNI_EINVAL;
3039 }
3040 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3041 return JNI_EINVAL;
3042 }
3043 // -Xshare:auto
3044 } else if (match_option(option, "-Xshare:auto")) {
3045 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3049 return JNI_EINVAL;
3050 }
3051 // -Xshare:off
3052 } else if (match_option(option, "-Xshare:off")) {
3053 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3054 return JNI_EINVAL;
3055 }
3056 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3057 return JNI_EINVAL;
3058 }
3059 // -Xverify
3060 } else if (match_option(option, "-Xverify", &tail)) {
3061 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3062 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3063 return JNI_EINVAL;
3064 }
3065 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 } else if (strcmp(tail, ":remote") == 0) {
3069 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3070 return JNI_EINVAL;
3071 }
3072 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3073 return JNI_EINVAL;
3074 }
3075 } else if (strcmp(tail, ":none") == 0) {
3076 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3077 return JNI_EINVAL;
3078 }
3079 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3080 return JNI_EINVAL;
3081 }
3082 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3083 return JNI_EINVAL;
3084 }
3085 // -Xdebug
3086 } else if (match_option(option, "-Xdebug")) {
3087 // note this flag has been used, then ignore
3088 set_xdebug_mode(true);
3089 // -Xnoagent
3090 } else if (match_option(option, "-Xnoagent")) {
3091 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3092 } else if (match_option(option, "-Xloggc:", &tail)) {
3093 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3094 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3095 _gc_log_filename = os::strdup_check_oom(tail);
3096 } else if (match_option(option, "-Xlog", &tail)) {
3097 bool ret = false;
3098 if (strcmp(tail, ":help") == 0) {
3099 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3100 vm_exit(0);
3101 } else if (strcmp(tail, ":disable") == 0) {
3102 LogConfiguration::disable_logging();
3103 ret = true;
3104 } else if (*tail == '\0') {
3105 ret = LogConfiguration::parse_command_line_arguments();
3106 assert(ret, "-Xlog without arguments should never fail to parse");
3107 } else if (*tail == ':') {
3108 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3109 }
3110 if (ret == false) {
3111 jio_fprintf(defaultStream::error_stream(),
3112 "Invalid -Xlog option '-Xlog%s'\n",
3113 tail);
3114 return JNI_EINVAL;
3115 }
3116 // JNI hooks
3117 } else if (match_option(option, "-Xcheck", &tail)) {
3118 if (!strcmp(tail, ":jni")) {
3119 #if !INCLUDE_JNI_CHECK
3120 warning("JNI CHECKING is not supported in this VM");
3121 #else
3122 CheckJNICalls = true;
3123 #endif // INCLUDE_JNI_CHECK
3124 } else if (is_bad_option(option, args->ignoreUnrecognized,
3125 "check")) {
3126 return JNI_EINVAL;
3127 }
3128 } else if (match_option(option, "vfprintf")) {
3129 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3130 } else if (match_option(option, "exit")) {
3131 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3132 } else if (match_option(option, "abort")) {
3133 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3134 // -XX:+AggressiveHeap
3135 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3136 jint result = set_aggressive_heap_flags();
3137 if (result != JNI_OK) {
3138 return result;
3139 }
3140 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3141 // and the last option wins.
3142 } else if (match_option(option, "-XX:+NeverTenure")) {
3143 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3144 return JNI_EINVAL;
3145 }
3146 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3153 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3154 return JNI_EINVAL;
3155 }
3156 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3157 return JNI_EINVAL;
3158 }
3159 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3163 uintx max_tenuring_thresh = 0;
3164 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3165 jio_fprintf(defaultStream::error_stream(),
3166 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3167 return JNI_EINVAL;
3168 }
3169
3170 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3171 return JNI_EINVAL;
3172 }
3173
3174 if (MaxTenuringThreshold == 0) {
3175 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3176 return JNI_EINVAL;
3177 }
3178 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3179 return JNI_EINVAL;
3180 }
3181 } else {
3182 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3183 return JNI_EINVAL;
3184 }
3185 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 }
3189 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3190 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3191 return JNI_EINVAL;
3192 }
3193 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3194 return JNI_EINVAL;
3195 }
3196 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3197 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3198 return JNI_EINVAL;
3199 }
3200 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3204 #if defined(DTRACE_ENABLED)
3205 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3206 return JNI_EINVAL;
3207 }
3208 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3212 return JNI_EINVAL;
3213 }
3214 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3215 return JNI_EINVAL;
3216 }
3217 #else // defined(DTRACE_ENABLED)
3218 jio_fprintf(defaultStream::error_stream(),
3219 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3220 return JNI_EINVAL;
3221 #endif // defined(DTRACE_ENABLED)
3222 #ifdef ASSERT
3223 } else if (match_option(option, "-XX:+FullGCALot")) {
3224 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3225 return JNI_EINVAL;
3226 }
3227 // disable scavenge before parallel mark-compact
3228 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3229 return JNI_EINVAL;
3230 }
3231 #endif
3232 #if !INCLUDE_MANAGEMENT
3233 } else if (match_option(option, "-XX:+ManagementServer")) {
3234 jio_fprintf(defaultStream::error_stream(),
3235 "ManagementServer is not supported in this VM.\n");
3236 return JNI_ERR;
3237 #endif // INCLUDE_MANAGEMENT
3238 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3239 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3240 // already been handled
3241 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3242 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3243 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3244 return JNI_EINVAL;
3245 }
3246 }
3247 // Unknown option
3248 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3249 return JNI_ERR;
3250 }
3251 }
3252
3253 // PrintSharedArchiveAndExit will turn on
3254 // -Xshare:on
3255 // -XX:+TraceClassPaths
3256 if (PrintSharedArchiveAndExit) {
3257 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3258 return JNI_EINVAL;
3259 }
3260 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3261 return JNI_EINVAL;
3262 }
3263 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3264 return JNI_EINVAL;
3265 }
3266 }
3267
3268 // Change the default value for flags which have different default values
3269 // when working with older JDKs.
3270 #ifdef LINUX
3271 if (JDK_Version::current().compare_major(6) <= 0 &&
3272 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3273 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3274 }
3275 #endif // LINUX
3276 fix_appclasspath();
3277 return JNI_OK;
3278 }
3279
3280 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3281 //
3282 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3283 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3284 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3285 // path is treated as the current directory.
3286 //
3287 // This causes problems with CDS, which requires that all directories specified in the classpath
3288 // must be empty. In most cases, applications do NOT want to load classes from the current
3289 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3290 // scripts compatible with CDS.
3291 void Arguments::fix_appclasspath() {
3292 if (IgnoreEmptyClassPaths) {
3293 const char separator = *os::path_separator();
3294 const char* src = _java_class_path->value();
3295
3296 // skip over all the leading empty paths
3297 while (*src == separator) {
3298 src ++;
3299 }
3300
3301 char* copy = os::strdup_check_oom(src, mtInternal);
3302
3303 // trim all trailing empty paths
3304 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3305 *tail = '\0';
3306 }
3307
3308 char from[3] = {separator, separator, '\0'};
3309 char to [2] = {separator, '\0'};
3310 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3311 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3312 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3313 }
3314
3315 _java_class_path->set_value(copy);
3316 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3317 }
3318
3319 if (!PrintSharedArchiveAndExit) {
3320 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3321 }
3322 }
3323
3324 static bool has_jar_files(const char* directory) {
3325 DIR* dir = os::opendir(directory);
3326 if (dir == NULL) return false;
3327
3328 struct dirent *entry;
3329 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3330 bool hasJarFile = false;
3331 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3332 const char* name = entry->d_name;
3333 const char* ext = name + strlen(name) - 4;
3334 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3335 }
3336 FREE_C_HEAP_ARRAY(char, dbuf);
3337 os::closedir(dir);
3338 return hasJarFile ;
3339 }
3340
3341 static int check_non_empty_dirs(const char* path) {
3342 const char separator = *os::path_separator();
3343 const char* const end = path + strlen(path);
3344 int nonEmptyDirs = 0;
3345 while (path < end) {
3346 const char* tmp_end = strchr(path, separator);
3347 if (tmp_end == NULL) {
3348 if (has_jar_files(path)) {
3349 nonEmptyDirs++;
3350 jio_fprintf(defaultStream::output_stream(),
3351 "Non-empty directory: %s\n", path);
3352 }
3353 path = end;
3354 } else {
3355 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3356 memcpy(dirpath, path, tmp_end - path);
3357 dirpath[tmp_end - path] = '\0';
3358 if (has_jar_files(dirpath)) {
3359 nonEmptyDirs++;
3360 jio_fprintf(defaultStream::output_stream(),
3361 "Non-empty directory: %s\n", dirpath);
3362 }
3363 FREE_C_HEAP_ARRAY(char, dirpath);
3364 path = tmp_end + 1;
3365 }
3366 }
3367 return nonEmptyDirs;
3368 }
3369
3370 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3371 // check if the default lib/endorsed directory exists; if so, error
3372 char path[JVM_MAXPATHLEN];
3373 const char* fileSep = os::file_separator();
3374 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3375
3376 if (CheckEndorsedAndExtDirs) {
3377 int nonEmptyDirs = 0;
3378 // check endorsed directory
3379 nonEmptyDirs += check_non_empty_dirs(path);
3380 // check the extension directories
3381 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3382 if (nonEmptyDirs > 0) {
3383 return JNI_ERR;
3384 }
3385 }
3386
3387 DIR* dir = os::opendir(path);
3388 if (dir != NULL) {
3389 jio_fprintf(defaultStream::output_stream(),
3390 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3391 "in modular form will be supported via the concept of upgradeable modules.\n");
3392 os::closedir(dir);
3393 return JNI_ERR;
3394 }
3395
3396 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3397 dir = os::opendir(path);
3398 if (dir != NULL) {
3399 jio_fprintf(defaultStream::output_stream(),
3400 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3401 "Use -classpath instead.\n.");
3402 os::closedir(dir);
3403 return JNI_ERR;
3404 }
3405
3406 if (scp_assembly_required) {
3407 // Assemble the bootclasspath elements into the final path.
3408 char *combined_path = scp_p->combined_path();
3409 Arguments::set_sysclasspath(combined_path);
3410 FREE_C_HEAP_ARRAY(char, combined_path);
3411 }
3412
3413 // This must be done after all arguments have been processed.
3414 // java_compiler() true means set to "NONE" or empty.
3415 if (java_compiler() && !xdebug_mode()) {
3416 // For backwards compatibility, we switch to interpreted mode if
3417 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3418 // not specified.
3419 set_mode_flags(_int);
3420 }
3421
3422 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3423 // but like -Xint, leave compilation thresholds unaffected.
3424 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3425 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3426 set_mode_flags(_int);
3427 }
3428
3429 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3430 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3431 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3432 }
3433
3434 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3435 // Don't degrade server performance for footprint
3436 if (FLAG_IS_DEFAULT(UseLargePages) &&
3437 MaxHeapSize < LargePageHeapSizeThreshold) {
3438 // No need for large granularity pages w/small heaps.
3439 // Note that large pages are enabled/disabled for both the
3440 // Java heap and the code cache.
3441 FLAG_SET_DEFAULT(UseLargePages, false);
3442 }
3443
3444 #elif defined(COMPILER2)
3445 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3446 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3447 }
3448 #endif
3449
3450 #ifndef TIERED
3451 // Tiered compilation is undefined.
3452 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3453 #endif
3454
3455 // If we are running in a headless jre, force java.awt.headless property
3456 // to be true unless the property has already been set.
3457 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3458 if (os::is_headless_jre()) {
3459 const char* headless = Arguments::get_property("java.awt.headless");
3460 if (headless == NULL) {
3461 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3462 if (headless_env == NULL) {
3463 if (!add_property("java.awt.headless=true")) {
3464 return JNI_ENOMEM;
3465 }
3466 } else {
3467 char buffer[256];
3468 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3469 if (!add_property(buffer)) {
3470 return JNI_ENOMEM;
3471 }
3472 }
3473 }
3474 }
3475
3476 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3477 // CMS can only be used with ParNew
3478 FLAG_SET_ERGO(bool, UseParNewGC, true);
3479 }
3480
3481 if (!check_vm_args_consistency()) {
3482 return JNI_ERR;
3483 }
3484
3485 return JNI_OK;
3486 }
3487
3488 // Helper class for controlling the lifetime of JavaVMInitArgs
3489 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3490 // deleted on the destruction of the ScopedVMInitArgs object.
3491 class ScopedVMInitArgs : public StackObj {
3492 private:
3493 JavaVMInitArgs _args;
3494 char* _container_name;
3495 bool _is_set;
3496 char* _vm_options_file_arg;
3497
3498 public:
3499 ScopedVMInitArgs(const char *container_name) {
3500 _args.version = JNI_VERSION_1_2;
3501 _args.nOptions = 0;
3502 _args.options = NULL;
3503 _args.ignoreUnrecognized = false;
3504 _container_name = (char *)container_name;
3505 _is_set = false;
3506 _vm_options_file_arg = NULL;
3507 }
3508
3509 // Populates the JavaVMInitArgs object represented by this
3510 // ScopedVMInitArgs object with the arguments in options. The
3511 // allocated memory is deleted by the destructor. If this method
3512 // returns anything other than JNI_OK, then this object is in a
3513 // partially constructed state, and should be abandoned.
3514 jint set_args(GrowableArray<JavaVMOption>* options) {
3515 _is_set = true;
3516 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3517 JavaVMOption, options->length(), mtInternal);
3518 if (options_arr == NULL) {
3519 return JNI_ENOMEM;
3520 }
3521 _args.options = options_arr;
3522
3523 for (int i = 0; i < options->length(); i++) {
3524 options_arr[i] = options->at(i);
3525 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3526 if (options_arr[i].optionString == NULL) {
3527 // Rely on the destructor to do cleanup.
3528 _args.nOptions = i;
3529 return JNI_ENOMEM;
3530 }
3531 }
3532
3533 _args.nOptions = options->length();
3534 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3535 return JNI_OK;
3536 }
3537
3538 JavaVMInitArgs* get() { return &_args; }
3539 char* container_name() { return _container_name; }
3540 bool is_set() { return _is_set; }
3541 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3542 char* vm_options_file_arg() { return _vm_options_file_arg; }
3543
3544 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3545 if (_vm_options_file_arg != NULL) {
3546 os::free(_vm_options_file_arg);
3547 }
3548 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3549 }
3550
3551 ~ScopedVMInitArgs() {
3552 if (_vm_options_file_arg != NULL) {
3553 os::free(_vm_options_file_arg);
3554 }
3555 if (_args.options == NULL) return;
3556 for (int i = 0; i < _args.nOptions; i++) {
3557 os::free(_args.options[i].optionString);
3558 }
3559 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3560 }
3561
3562 // Insert options into this option list, to replace option at
3563 // vm_options_file_pos (-XX:VMOptionsFile)
3564 jint insert(const JavaVMInitArgs* args,
3565 const JavaVMInitArgs* args_to_insert,
3566 const int vm_options_file_pos) {
3567 assert(_args.options == NULL, "shouldn't be set yet");
3568 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3569 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3570
3571 int length = args->nOptions + args_to_insert->nOptions - 1;
3572 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3573 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3574 for (int i = 0; i < args->nOptions; i++) {
3575 if (i == vm_options_file_pos) {
3576 // insert the new options starting at the same place as the
3577 // -XX:VMOptionsFile option
3578 for (int j = 0; j < args_to_insert->nOptions; j++) {
3579 options->push(args_to_insert->options[j]);
3580 }
3581 } else {
3582 options->push(args->options[i]);
3583 }
3584 }
3585 // make into options array
3586 jint result = set_args(options);
3587 delete options;
3588 return result;
3589 }
3590 };
3591
3592 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3593 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3594 }
3595
3596 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3597 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3598 }
3599
3600 jint Arguments::parse_options_environment_variable(const char* name,
3601 ScopedVMInitArgs* vm_args) {
3602 char *buffer = ::getenv(name);
3603
3604 // Don't check this environment variable if user has special privileges
3605 // (e.g. unix su command).
3606 if (buffer == NULL || os::have_special_privileges()) {
3607 return JNI_OK;
3608 }
3609
3610 if ((buffer = os::strdup(buffer)) == NULL) {
3611 return JNI_ENOMEM;
3612 }
3613
3614 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3615
3616 os::free(buffer);
3617 return retcode;
3618 }
3619
3620 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3621 // read file into buffer
3622 int fd = ::open(file_name, O_RDONLY);
3623 if (fd < 0) {
3624 jio_fprintf(defaultStream::error_stream(),
3625 "Could not open options file '%s'\n",
3626 file_name);
3627 return JNI_ERR;
3628 }
3629
3630 struct stat stbuf;
3631 int retcode = os::stat(file_name, &stbuf);
3632 if (retcode != 0) {
3633 jio_fprintf(defaultStream::error_stream(),
3634 "Could not stat options file '%s'\n",
3635 file_name);
3636 os::close(fd);
3637 return JNI_ERR;
3638 }
3639
3640 if (stbuf.st_size == 0) {
3641 // tell caller there is no option data and that is ok
3642 os::close(fd);
3643 return JNI_OK;
3644 }
3645
3646 // '+ 1' for NULL termination even with max bytes
3647 size_t bytes_alloc = stbuf.st_size + 1;
3648
3649 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3650 if (NULL == buf) {
3651 jio_fprintf(defaultStream::error_stream(),
3652 "Could not allocate read buffer for options file parse\n");
3653 os::close(fd);
3654 return JNI_ENOMEM;
3655 }
3656
3657 memset(buf, 0, bytes_alloc);
3658
3659 // Fill buffer
3660 // Use ::read() instead of os::read because os::read()
3661 // might do a thread state transition
3662 // and it is too early for that here
3663
3664 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3665 os::close(fd);
3666 if (bytes_read < 0) {
3667 FREE_C_HEAP_ARRAY(char, buf);
3668 jio_fprintf(defaultStream::error_stream(),
3669 "Could not read options file '%s'\n", file_name);
3670 return JNI_ERR;
3671 }
3672
3673 if (bytes_read == 0) {
3674 // tell caller there is no option data and that is ok
3675 FREE_C_HEAP_ARRAY(char, buf);
3676 return JNI_OK;
3677 }
3678
3679 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3680
3681 FREE_C_HEAP_ARRAY(char, buf);
3682 return retcode;
3683 }
3684
3685 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3686 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3687
3688 // some pointers to help with parsing
3689 char *buffer_end = buffer + buf_len;
3690 char *opt_hd = buffer;
3691 char *wrt = buffer;
3692 char *rd = buffer;
3693
3694 // parse all options
3695 while (rd < buffer_end) {
3696 // skip leading white space from the input string
3697 while (rd < buffer_end && isspace(*rd)) {
3698 rd++;
3699 }
3700
3701 if (rd >= buffer_end) {
3702 break;
3703 }
3704
3705 // Remember this is where we found the head of the token.
3706 opt_hd = wrt;
3707
3708 // Tokens are strings of non white space characters separated
3709 // by one or more white spaces.
3710 while (rd < buffer_end && !isspace(*rd)) {
3711 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3712 int quote = *rd; // matching quote to look for
3713 rd++; // don't copy open quote
3714 while (rd < buffer_end && *rd != quote) {
3715 // include everything (even spaces)
3716 // up until the close quote
3717 *wrt++ = *rd++; // copy to option string
3718 }
3719
3720 if (rd < buffer_end) {
3721 rd++; // don't copy close quote
3722 } else {
3723 // did not see closing quote
3724 jio_fprintf(defaultStream::error_stream(),
3725 "Unmatched quote in %s\n", name);
3726 delete options;
3727 return JNI_ERR;
3728 }
3729 } else {
3730 *wrt++ = *rd++; // copy to option string
3731 }
3732 }
3733
3734 // steal a white space character and set it to NULL
3735 *wrt++ = '\0';
3736 // We now have a complete token
3737
3738 JavaVMOption option;
3739 option.optionString = opt_hd;
3740 option.extraInfo = NULL;
3741
3742 options->append(option); // Fill in option
3743
3744 rd++; // Advance to next character
3745 }
3746
3747 // Fill out JavaVMInitArgs structure.
3748 jint status = vm_args->set_args(options);
3749
3750 delete options;
3751 return status;
3752 }
3753
3754 void Arguments::set_shared_spaces_flags() {
3755 if (DumpSharedSpaces) {
3756 if (RequireSharedSpaces) {
3757 warning("Cannot dump shared archive while using shared archive");
3758 }
3759 UseSharedSpaces = false;
3760 #ifdef _LP64
3761 if (!UseCompressedOops || !UseCompressedClassPointers) {
3762 vm_exit_during_initialization(
3763 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3764 }
3765 } else {
3766 if (!UseCompressedOops || !UseCompressedClassPointers) {
3767 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3768 }
3769 #endif
3770 }
3771 }
3772
3773 #if !INCLUDE_ALL_GCS
3774 static void force_serial_gc() {
3775 FLAG_SET_DEFAULT(UseSerialGC, true);
3776 UNSUPPORTED_GC_OPTION(UseG1GC);
3777 UNSUPPORTED_GC_OPTION(UseParallelGC);
3778 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3779 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3780 UNSUPPORTED_GC_OPTION(UseParNewGC);
3781 }
3782 #endif // INCLUDE_ALL_GCS
3783
3784 // Sharing support
3785 // Construct the path to the archive
3786 static char* get_shared_archive_path() {
3787 char *shared_archive_path;
3788 if (SharedArchiveFile == NULL) {
3789 char jvm_path[JVM_MAXPATHLEN];
3790 os::jvm_path(jvm_path, sizeof(jvm_path));
3791 char *end = strrchr(jvm_path, *os::file_separator());
3792 if (end != NULL) *end = '\0';
3793 size_t jvm_path_len = strlen(jvm_path);
3794 size_t file_sep_len = strlen(os::file_separator());
3795 const size_t len = jvm_path_len + file_sep_len + 20;
3796 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3797 if (shared_archive_path != NULL) {
3798 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3799 jvm_path, os::file_separator());
3800 }
3801 } else {
3802 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3803 }
3804 return shared_archive_path;
3805 }
3806
3807 #ifndef PRODUCT
3808 // Determine whether LogVMOutput should be implicitly turned on.
3809 static bool use_vm_log() {
3810 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3811 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3812 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3813 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3814 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3815 return true;
3816 }
3817
3818 #ifdef COMPILER1
3819 if (PrintC1Statistics) {
3820 return true;
3821 }
3822 #endif // COMPILER1
3823
3824 #ifdef COMPILER2
3825 if (PrintOptoAssembly || PrintOptoStatistics) {
3826 return true;
3827 }
3828 #endif // COMPILER2
3829
3830 return false;
3831 }
3832
3833 #endif // PRODUCT
3834
3835 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3836 for (int index = 0; index < args->nOptions; index++) {
3837 const JavaVMOption* option = args->options + index;
3838 const char* tail;
3839 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3840 return true;
3841 }
3842 }
3843 return false;
3844 }
3845
3846 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3847 const char* vm_options_file,
3848 const int vm_options_file_pos,
3849 ScopedVMInitArgs* vm_options_file_args,
3850 ScopedVMInitArgs* args_out) {
3851 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3852 if (code != JNI_OK) {
3853 return code;
3854 }
3855
3856 if (vm_options_file_args->get()->nOptions < 1) {
3857 return JNI_OK;
3858 }
3859
3860 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3861 jio_fprintf(defaultStream::error_stream(),
3862 "A VM options file may not refer to a VM options file. "
3863 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3864 "options file '%s' in options container '%s' is an error.\n",
3865 vm_options_file_args->vm_options_file_arg(),
3866 vm_options_file_args->container_name());
3867 return JNI_EINVAL;
3868 }
3869
3870 return args_out->insert(args, vm_options_file_args->get(),
3871 vm_options_file_pos);
3872 }
3873
3874 // Expand -XX:VMOptionsFile found in args_in as needed.
3875 // mod_args and args_out parameters may return values as needed.
3876 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3877 ScopedVMInitArgs* mod_args,
3878 JavaVMInitArgs** args_out) {
3879 jint code = match_special_option_and_act(args_in, mod_args);
3880 if (code != JNI_OK) {
3881 return code;
3882 }
3883
3884 if (mod_args->is_set()) {
3885 // args_in contains -XX:VMOptionsFile and mod_args contains the
3886 // original options from args_in along with the options expanded
3887 // from the VMOptionsFile. Return a short-hand to the caller.
3888 *args_out = mod_args->get();
3889 } else {
3890 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3891 }
3892 return JNI_OK;
3893 }
3894
3895 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3896 ScopedVMInitArgs* args_out) {
3897 // Remaining part of option string
3898 const char* tail;
3899 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3900
3901 for (int index = 0; index < args->nOptions; index++) {
3902 const JavaVMOption* option = args->options + index;
3903 if (ArgumentsExt::process_options(option)) {
3904 continue;
3905 }
3906 if (match_option(option, "-XX:Flags=", &tail)) {
3907 Arguments::set_jvm_flags_file(tail);
3908 continue;
3909 }
3910 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3911 if (vm_options_file_args.found_vm_options_file_arg()) {
3912 jio_fprintf(defaultStream::error_stream(),
3913 "The option '%s' is already specified in the options "
3914 "container '%s' so the specification of '%s' in the "
3915 "same options container is an error.\n",
3916 vm_options_file_args.vm_options_file_arg(),
3917 vm_options_file_args.container_name(),
3918 option->optionString);
3919 return JNI_EINVAL;
3920 }
3921 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3922 // If there's a VMOptionsFile, parse that
3923 jint code = insert_vm_options_file(args, tail, index,
3924 &vm_options_file_args, args_out);
3925 if (code != JNI_OK) {
3926 return code;
3927 }
3928 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3929 if (args_out->is_set()) {
3930 // The VMOptions file inserted some options so switch 'args'
3931 // to the new set of options, and continue processing which
3932 // preserves "last option wins" semantics.
3933 args = args_out->get();
3934 // The first option from the VMOptionsFile replaces the
3935 // current option. So we back track to process the
3936 // replacement option.
3937 index--;
3938 }
3939 continue;
3940 }
3941 if (match_option(option, "-XX:+PrintVMOptions")) {
3942 PrintVMOptions = true;
3943 continue;
3944 }
3945 if (match_option(option, "-XX:-PrintVMOptions")) {
3946 PrintVMOptions = false;
3947 continue;
3948 }
3949 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3950 IgnoreUnrecognizedVMOptions = true;
3951 continue;
3952 }
3953 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3954 IgnoreUnrecognizedVMOptions = false;
3955 continue;
3956 }
3957 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3958 CommandLineFlags::printFlags(tty, false);
3959 vm_exit(0);
3960 }
3961 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3962 #if INCLUDE_NMT
3963 // The launcher did not setup nmt environment variable properly.
3964 if (!MemTracker::check_launcher_nmt_support(tail)) {
3965 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3966 }
3967
3968 // Verify if nmt option is valid.
3969 if (MemTracker::verify_nmt_option()) {
3970 // Late initialization, still in single-threaded mode.
3971 if (MemTracker::tracking_level() >= NMT_summary) {
3972 MemTracker::init();
3973 }
3974 } else {
3975 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3976 }
3977 continue;
3978 #else
3979 jio_fprintf(defaultStream::error_stream(),
3980 "Native Memory Tracking is not supported in this VM\n");
3981 return JNI_ERR;
3982 #endif
3983 }
3984
3985 #ifndef PRODUCT
3986 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3987 CommandLineFlags::printFlags(tty, true);
3988 vm_exit(0);
3989 }
3990 #endif
3991 }
3992 return JNI_OK;
3993 }
3994
3995 static void print_options(const JavaVMInitArgs *args) {
3996 const char* tail;
3997 for (int index = 0; index < args->nOptions; index++) {
3998 const JavaVMOption *option = args->options + index;
3999 if (match_option(option, "-XX:", &tail)) {
4000 logOption(tail);
4001 }
4002 }
4003 }
4004
4005 bool Arguments::handle_deprecated_print_gc_flags() {
4006 if (PrintGC) {
4007 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4008 }
4009 if (PrintGCDetails) {
4010 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4011 }
4012
4013 if (_gc_log_filename != NULL) {
4014 // -Xloggc was used to specify a filename
4015 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4016 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4017 } else if (PrintGC || PrintGCDetails) {
4018 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4019 }
4020 return true;
4021 }
4022
4023 // Parse entry point called from JNI_CreateJavaVM
4024
4025 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4026 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4027
4028 // Initialize ranges and constraints
4029 CommandLineFlagRangeList::init();
4030 CommandLineFlagConstraintList::init();
4031
4032 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4033 const char* hotspotrc = ".hotspotrc";
4034 bool settings_file_specified = false;
4035 bool needs_hotspotrc_warning = false;
4036 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4037 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4038
4039 // Pointers to current working set of containers
4040 JavaVMInitArgs* cur_cmd_args;
4041 JavaVMInitArgs* cur_java_options_args;
4042 JavaVMInitArgs* cur_java_tool_options_args;
4043
4044 // Containers for modified/expanded options
4045 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4046 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4047 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4048
4049
4050 jint code =
4051 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4052 if (code != JNI_OK) {
4053 return code;
4054 }
4055
4056 code = parse_java_options_environment_variable(&initial_java_options_args);
4057 if (code != JNI_OK) {
4058 return code;
4059 }
4060
4061 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4062 &mod_java_tool_options_args,
4063 &cur_java_tool_options_args);
4064 if (code != JNI_OK) {
4065 return code;
4066 }
4067
4068 code = expand_vm_options_as_needed(initial_cmd_args,
4069 &mod_cmd_args,
4070 &cur_cmd_args);
4071 if (code != JNI_OK) {
4072 return code;
4073 }
4074
4075 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4076 &mod_java_options_args,
4077 &cur_java_options_args);
4078 if (code != JNI_OK) {
4079 return code;
4080 }
4081
4082 const char* flags_file = Arguments::get_jvm_flags_file();
4083 settings_file_specified = (flags_file != NULL);
4084
4085 if (IgnoreUnrecognizedVMOptions) {
4086 cur_cmd_args->ignoreUnrecognized = true;
4087 cur_java_tool_options_args->ignoreUnrecognized = true;
4088 cur_java_options_args->ignoreUnrecognized = true;
4089 }
4090
4091 // Parse specified settings file
4092 if (settings_file_specified) {
4093 if (!process_settings_file(flags_file, true,
4094 cur_cmd_args->ignoreUnrecognized)) {
4095 return JNI_EINVAL;
4096 }
4097 } else {
4098 #ifdef ASSERT
4099 // Parse default .hotspotrc settings file
4100 if (!process_settings_file(".hotspotrc", false,
4101 cur_cmd_args->ignoreUnrecognized)) {
4102 return JNI_EINVAL;
4103 }
4104 #else
4105 struct stat buf;
4106 if (os::stat(hotspotrc, &buf) == 0) {
4107 needs_hotspotrc_warning = true;
4108 }
4109 #endif
4110 }
4111
4112 if (PrintVMOptions) {
4113 print_options(cur_java_tool_options_args);
4114 print_options(cur_cmd_args);
4115 print_options(cur_java_options_args);
4116 }
4117
4118 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4119 jint result = parse_vm_init_args(cur_java_tool_options_args,
4120 cur_java_options_args,
4121 cur_cmd_args);
4122
4123 if (result != JNI_OK) {
4124 return result;
4125 }
4126
4127 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4128 SharedArchivePath = get_shared_archive_path();
4129 if (SharedArchivePath == NULL) {
4130 return JNI_ENOMEM;
4131 }
4132
4133 // Set up VerifySharedSpaces
4134 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4135 VerifySharedSpaces = true;
4136 }
4137
4138 // Delay warning until here so that we've had a chance to process
4139 // the -XX:-PrintWarnings flag
4140 if (needs_hotspotrc_warning) {
4141 warning("%s file is present but has been ignored. "
4142 "Run with -XX:Flags=%s to load the file.",
4143 hotspotrc, hotspotrc);
4144 }
4145
4146 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4147 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4148 #endif
4149
4150 ArgumentsExt::report_unsupported_options();
4151
4152 #ifndef PRODUCT
4153 if (TraceBytecodesAt != 0) {
4154 TraceBytecodes = true;
4155 }
4156 if (CountCompiledCalls) {
4157 if (UseCounterDecay) {
4158 warning("UseCounterDecay disabled because CountCalls is set");
4159 UseCounterDecay = false;
4160 }
4161 }
4162 #endif // PRODUCT
4163
4164 if (ScavengeRootsInCode == 0) {
4165 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4166 warning("Forcing ScavengeRootsInCode non-zero");
4167 }
4168 ScavengeRootsInCode = 1;
4169 }
4170
4171 if (!handle_deprecated_print_gc_flags()) {
4172 return JNI_EINVAL;
4173 }
4174
4175 // Set object alignment values.
4176 set_object_alignment();
4177
4178 #if !INCLUDE_ALL_GCS
4179 force_serial_gc();
4180 #endif // INCLUDE_ALL_GCS
4181 #if !INCLUDE_CDS
4182 if (DumpSharedSpaces || RequireSharedSpaces) {
4183 jio_fprintf(defaultStream::error_stream(),
4184 "Shared spaces are not supported in this VM\n");
4185 return JNI_ERR;
4186 }
4187 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4188 warning("Shared spaces are not supported in this VM");
4189 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4190 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4191 }
4192 no_shared_spaces("CDS Disabled");
4193 #endif // INCLUDE_CDS
4194
4195 return JNI_OK;
4196 }
4197
4198 jint Arguments::apply_ergo() {
4199
4200 // Set flags based on ergonomics.
4201 set_ergonomics_flags();
4202
4203 set_shared_spaces_flags();
4204
4205 // Check the GC selections again.
4206 if (!check_gc_consistency()) {
4207 return JNI_EINVAL;
4208 }
4209
4210 if (TieredCompilation) {
4211 set_tiered_flags();
4212 } else {
4213 int max_compilation_policy_choice = 1;
4214 #ifdef COMPILER2
4215 max_compilation_policy_choice = 2;
4216 #endif
4217 // Check if the policy is valid.
4218 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4219 vm_exit_during_initialization(
4220 "Incompatible compilation policy selected", NULL);
4221 }
4222 // Scale CompileThreshold
4223 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4224 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4225 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4226 }
4227 }
4228
4229 #ifdef COMPILER2
4230 #ifndef PRODUCT
4231 if (PrintIdealGraphLevel > 0) {
4232 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4233 }
4234 #endif
4235 #endif
4236
4237 // Set heap size based on available physical memory
4238 set_heap_size();
4239
4240 ArgumentsExt::set_gc_specific_flags();
4241
4242 // Initialize Metaspace flags and alignments
4243 Metaspace::ergo_initialize();
4244
4245 // Set bytecode rewriting flags
4246 set_bytecode_flags();
4247
4248 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4249 jint code = set_aggressive_opts_flags();
4250 if (code != JNI_OK) {
4251 return code;
4252 }
4253
4254 // Turn off biased locking for locking debug mode flags,
4255 // which are subtly different from each other but neither works with
4256 // biased locking
4257 if (UseHeavyMonitors
4258 #ifdef COMPILER1
4259 || !UseFastLocking
4260 #endif // COMPILER1
4261 #if INCLUDE_JVMCI
4262 || !JVMCIUseFastLocking
4263 #endif
4264 ) {
4265 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4266 // flag set to true on command line; warn the user that they
4267 // can't enable biased locking here
4268 warning("Biased Locking is not supported with locking debug flags"
4269 "; ignoring UseBiasedLocking flag." );
4270 }
4271 UseBiasedLocking = false;
4272 }
4273
4274 #ifdef CC_INTERP
4275 // Clear flags not supported on zero.
4276 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4277 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4278 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4279 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4280 #endif // CC_INTERP
4281
4282 #ifdef COMPILER2
4283 if (!EliminateLocks) {
4284 EliminateNestedLocks = false;
4285 }
4286 if (!Inline) {
4287 IncrementalInline = false;
4288 }
4289 #ifndef PRODUCT
4290 if (!IncrementalInline) {
4291 AlwaysIncrementalInline = false;
4292 }
4293 #endif
4294 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4295 // nothing to use the profiling, turn if off
4296 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4297 }
4298 #endif
4299
4300 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4301 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4302 DebugNonSafepoints = true;
4303 }
4304
4305 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4306 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4307 }
4308
4309 #ifndef PRODUCT
4310 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4311 if (use_vm_log()) {
4312 LogVMOutput = true;
4313 }
4314 }
4315 #endif // PRODUCT
4316
4317 if (PrintCommandLineFlags) {
4318 CommandLineFlags::printSetFlags(tty);
4319 }
4320
4321 // Apply CPU specific policy for the BiasedLocking
4322 if (UseBiasedLocking) {
4323 if (!VM_Version::use_biased_locking() &&
4324 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4325 UseBiasedLocking = false;
4326 }
4327 }
4328 #ifdef COMPILER2
4329 if (!UseBiasedLocking || EmitSync != 0) {
4330 UseOptoBiasInlining = false;
4331 }
4332 #endif
4333
4334 return JNI_OK;
4335 }
4336
4337 jint Arguments::adjust_after_os() {
4338 if (UseNUMA) {
4339 if (UseParallelGC || UseParallelOldGC) {
4340 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4341 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4342 }
4343 }
4344 // UseNUMAInterleaving is set to ON for all collectors and
4345 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4346 // such as the parallel collector for Linux and Solaris will
4347 // interleave old gen and survivor spaces on top of NUMA
4348 // allocation policy for the eden space.
4349 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4350 // all platforms and ParallelGC on Windows will interleave all
4351 // of the heap spaces across NUMA nodes.
4352 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4353 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4354 }
4355 }
4356 return JNI_OK;
4357 }
4358
4359 int Arguments::PropertyList_count(SystemProperty* pl) {
4360 int count = 0;
4361 while(pl != NULL) {
4362 count++;
4363 pl = pl->next();
4364 }
4365 return count;
4366 }
4367
4368 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4369 assert(key != NULL, "just checking");
4370 SystemProperty* prop;
4371 for (prop = pl; prop != NULL; prop = prop->next()) {
4372 if (strcmp(key, prop->key()) == 0) return prop->value();
4373 }
4374 return NULL;
4375 }
4376
4377 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4378 int count = 0;
4379 const char* ret_val = NULL;
4380
4381 while(pl != NULL) {
4382 if(count >= index) {
4383 ret_val = pl->key();
4384 break;
4385 }
4386 count++;
4387 pl = pl->next();
4388 }
4389
4390 return ret_val;
4391 }
4392
4393 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4394 int count = 0;
4395 char* ret_val = NULL;
4396
4397 while(pl != NULL) {
4398 if(count >= index) {
4399 ret_val = pl->value();
4400 break;
4401 }
4402 count++;
4403 pl = pl->next();
4404 }
4405
4406 return ret_val;
4407 }
4408
4409 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4410 SystemProperty* p = *plist;
4411 if (p == NULL) {
4412 *plist = new_p;
4413 } else {
4414 while (p->next() != NULL) {
4415 p = p->next();
4416 }
4417 p->set_next(new_p);
4418 }
4419 }
4420
4421 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4422 if (plist == NULL)
4423 return;
4424
4425 SystemProperty* new_p = new SystemProperty(k, v, true);
4426 PropertyList_add(plist, new_p);
4427 }
4428
4429 void Arguments::PropertyList_add(SystemProperty *element) {
4430 PropertyList_add(&_system_properties, element);
4431 }
4432
4433 // This add maintains unique property key in the list.
4434 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4435 if (plist == NULL)
4436 return;
4437
4438 // If property key exist then update with new value.
4439 SystemProperty* prop;
4440 for (prop = *plist; prop != NULL; prop = prop->next()) {
4441 if (strcmp(k, prop->key()) == 0) {
4442 if (append) {
4443 prop->append_value(v);
4444 } else {
4445 prop->set_value(v);
4446 }
4447 return;
4448 }
4449 }
4450
4451 PropertyList_add(plist, k, v);
4452 }
4453
4454 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4455 // Returns true if all of the source pointed by src has been copied over to
4456 // the destination buffer pointed by buf. Otherwise, returns false.
4457 // Notes:
4458 // 1. If the length (buflen) of the destination buffer excluding the
4459 // NULL terminator character is not long enough for holding the expanded
4460 // pid characters, it also returns false instead of returning the partially
4461 // expanded one.
4462 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4463 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4464 char* buf, size_t buflen) {
4465 const char* p = src;
4466 char* b = buf;
4467 const char* src_end = &src[srclen];
4468 char* buf_end = &buf[buflen - 1];
4469
4470 while (p < src_end && b < buf_end) {
4471 if (*p == '%') {
4472 switch (*(++p)) {
4473 case '%': // "%%" ==> "%"
4474 *b++ = *p++;
4475 break;
4476 case 'p': { // "%p" ==> current process id
4477 // buf_end points to the character before the last character so
4478 // that we could write '\0' to the end of the buffer.
4479 size_t buf_sz = buf_end - b + 1;
4480 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4481
4482 // if jio_snprintf fails or the buffer is not long enough to hold
4483 // the expanded pid, returns false.
4484 if (ret < 0 || ret >= (int)buf_sz) {
4485 return false;
4486 } else {
4487 b += ret;
4488 assert(*b == '\0', "fail in copy_expand_pid");
4489 if (p == src_end && b == buf_end + 1) {
4490 // reach the end of the buffer.
4491 return true;
4492 }
4493 }
4494 p++;
4495 break;
4496 }
4497 default :
4498 *b++ = '%';
4499 }
4500 } else {
4501 *b++ = *p++;
4502 }
4503 }
4504 *b = '\0';
4505 return (p == src_end); // return false if not all of the source was copied
4506 }