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