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 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
337 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
338
339 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
340 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
341 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
342 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
343 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
344 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
345 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
346 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
347
348 // -------------- Obsolete Flags - sorted by expired_in --------------
349 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 #ifndef ZERO
363 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 #endif // ZERO
366 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
373 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
374 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
375 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
376
377 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
378 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
379 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
380 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
381 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
382 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
383 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
384 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
385 #endif
386
387 { NULL, JDK_Version(0), JDK_Version(0) }
388 };
389
390 // Flags that are aliases for other flags.
391 typedef struct {
392 const char* alias_name;
393 const char* real_name;
394 } AliasedFlag;
395
396 static AliasedFlag const aliased_jvm_flags[] = {
397 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
398 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
399 { "CMSMarkStackSize", "MarkStackSize" },
400 { "G1MarkStackSize", "MarkStackSize" },
401 { "ParallelMarkingThreads", "ConcGCThreads" },
402 { "ParallelCMSThreads", "ConcGCThreads" },
403 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
404 { NULL, NULL}
405 };
406
407 static AliasedLoggingFlag const aliased_logging_flags[] = {
408 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
409 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(classload) },
410 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(classload, preorder) },
411 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(classpath) },
412 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(classresolve) },
413 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(classunload) },
414 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
415 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
416 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepointcleanup) },
417 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
418 };
419
420 #ifndef PRODUCT
421 // These options are removed in jdk9. Remove this code for jdk10.
422 static AliasedFlag const removed_develop_logging_flags[] = {
423 { "TraceClassInitialization", "-Xlog:classinit" },
424 { "TraceClassLoaderData", "-Xlog:classloaderdata" },
425 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
426 { "TraceItables", "-Xlog:itables=debug" },
427 { "TraceSafepoint", "-Xlog:safepoint=debug" },
428 { "TraceStartupTime", "-Xlog:startuptime" },
429 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
430 { "PrintVtables", "-Xlog:vtables=debug" },
431 { "VerboseVerification", "-Xlog:verboseverification" },
432 { NULL, NULL }
433 };
434 #endif //PRODUCT
435
436 // Return true if "v" is less than "other", where "other" may be "undefined".
437 static bool version_less_than(JDK_Version v, JDK_Version other) {
438 assert(!v.is_undefined(), "must be defined");
439 if (!other.is_undefined() && v.compare(other) >= 0) {
440 return false;
441 } else {
442 return true;
443 }
444 }
445
446 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
447 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
448 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
449 flag = special_jvm_flags[i];
450 return true;
451 }
452 }
453 return false;
454 }
455
456 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
457 assert(version != NULL, "Must provide a version buffer");
458 SpecialFlag flag;
459 if (lookup_special_flag(flag_name, flag)) {
460 if (!flag.obsolete_in.is_undefined()) {
461 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
462 *version = flag.obsolete_in;
463 return true;
464 }
465 }
466 }
467 return false;
468 }
469
470 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
471 assert(version != NULL, "Must provide a version buffer");
472 SpecialFlag flag;
473 if (lookup_special_flag(flag_name, flag)) {
474 if (!flag.deprecated_in.is_undefined()) {
475 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
476 version_less_than(JDK_Version::current(), flag.expired_in)) {
477 *version = flag.deprecated_in;
478 return 1;
479 } else {
480 return -1;
481 }
482 }
483 }
484 return 0;
485 }
486
487 #ifndef PRODUCT
488 const char* Arguments::removed_develop_logging_flag_name(const char* name){
489 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
490 const AliasedFlag& flag = removed_develop_logging_flags[i];
491 if (strcmp(flag.alias_name, name) == 0) {
492 return flag.real_name;
493 }
494 }
495 return NULL;
496 }
497 #endif // PRODUCT
498
499 const char* Arguments::real_flag_name(const char *flag_name) {
500 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
501 const AliasedFlag& flag_status = aliased_jvm_flags[i];
502 if (strcmp(flag_status.alias_name, flag_name) == 0) {
503 return flag_status.real_name;
504 }
505 }
506 return flag_name;
507 }
508
509 #ifdef ASSERT
510 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
511 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
512 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
513 return true;
514 }
515 }
516 return false;
517 }
518
519 static bool verify_special_jvm_flags() {
520 bool success = true;
521 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
522 const SpecialFlag& flag = special_jvm_flags[i];
523 if (lookup_special_flag(flag.name, i)) {
524 warning("Duplicate special flag declaration \"%s\"", flag.name);
525 success = false;
526 }
527 if (flag.deprecated_in.is_undefined() &&
528 flag.obsolete_in.is_undefined()) {
529 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
530 success = false;
531 }
532
533 if (!flag.deprecated_in.is_undefined()) {
534 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
535 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
536 success = false;
537 }
538
539 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
540 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
541 success = false;
542 }
543 }
544
545 if (!flag.obsolete_in.is_undefined()) {
546 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
547 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
548 success = false;
549 }
550
551 // if flag has become obsolete it should not have a "globals" flag defined anymore.
552 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
553 if (Flag::find_flag(flag.name) != NULL) {
554 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
555 success = false;
556 }
557 }
558 }
559
560 if (!flag.expired_in.is_undefined()) {
561 // if flag has become expired it should not have a "globals" flag defined anymore.
562 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
563 if (Flag::find_flag(flag.name) != NULL) {
564 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
565 success = false;
566 }
567 }
568 }
569
570 }
571 return success;
572 }
573 #endif
574
575 // Constructs the system class path (aka boot class path) from the following
576 // components, in order:
577 //
578 // prefix // from -Xbootclasspath/p:...
579 // base // from os::get_system_properties() or -Xbootclasspath=
580 // suffix // from -Xbootclasspath/a:...
581 //
582 // This could be AllStatic, but it isn't needed after argument processing is
583 // complete.
584 class SysClassPath: public StackObj {
585 public:
586 SysClassPath(const char* base);
587 ~SysClassPath();
588
589 inline void set_base(const char* base);
590 inline void add_prefix(const char* prefix);
591 inline void add_suffix_to_prefix(const char* suffix);
592 inline void add_suffix(const char* suffix);
593 inline void reset_path(const char* base);
594
595 inline const char* get_base() const { return _items[_scp_base]; }
596 inline const char* get_prefix() const { return _items[_scp_prefix]; }
597 inline const char* get_suffix() const { return _items[_scp_suffix]; }
598
599 // Combine all the components into a single c-heap-allocated string; caller
600 // must free the string if/when no longer needed.
601 char* combined_path();
602
603 private:
604 // Utility routines.
605 static char* add_to_path(const char* path, const char* str, bool prepend);
606 static char* add_jars_to_path(char* path, const char* directory);
607
608 inline void reset_item_at(int index);
609
610 // Array indices for the items that make up the sysclasspath. All except the
611 // base are allocated in the C heap and freed by this class.
612 enum {
613 _scp_prefix, // from -Xbootclasspath/p:...
614 _scp_base, // the default sysclasspath
615 _scp_suffix, // from -Xbootclasspath/a:...
616 _scp_nitems // the number of items, must be last.
617 };
618
619 const char* _items[_scp_nitems];
620 };
621
622 SysClassPath::SysClassPath(const char* base) {
623 memset(_items, 0, sizeof(_items));
624 _items[_scp_base] = base;
625 }
626
627 SysClassPath::~SysClassPath() {
628 // Free everything except the base.
629 for (int i = 0; i < _scp_nitems; ++i) {
630 if (i != _scp_base) reset_item_at(i);
631 }
632 }
633
634 inline void SysClassPath::set_base(const char* base) {
635 _items[_scp_base] = base;
636 }
637
638 inline void SysClassPath::add_prefix(const char* prefix) {
639 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
640 }
641
642 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
643 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
644 }
645
646 inline void SysClassPath::add_suffix(const char* suffix) {
647 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
648 }
649
650 inline void SysClassPath::reset_item_at(int index) {
651 assert(index < _scp_nitems && index != _scp_base, "just checking");
652 if (_items[index] != NULL) {
653 FREE_C_HEAP_ARRAY(char, _items[index]);
654 _items[index] = NULL;
655 }
656 }
657
658 inline void SysClassPath::reset_path(const char* base) {
659 // Clear the prefix and suffix.
660 reset_item_at(_scp_prefix);
661 reset_item_at(_scp_suffix);
662 set_base(base);
663 }
664
665 //------------------------------------------------------------------------------
666
667
668 // Combine the bootclasspath elements, some of which may be null, into a single
669 // c-heap-allocated string.
670 char* SysClassPath::combined_path() {
671 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
672
673 size_t lengths[_scp_nitems];
674 size_t total_len = 0;
675
676 const char separator = *os::path_separator();
677
678 // Get the lengths.
679 int i;
680 for (i = 0; i < _scp_nitems; ++i) {
681 if (_items[i] != NULL) {
682 lengths[i] = strlen(_items[i]);
683 // Include space for the separator char (or a NULL for the last item).
684 total_len += lengths[i] + 1;
685 }
686 }
687 assert(total_len > 0, "empty sysclasspath not allowed");
688
689 // Copy the _items to a single string.
690 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
691 char* cp_tmp = cp;
692 for (i = 0; i < _scp_nitems; ++i) {
693 if (_items[i] != NULL) {
694 memcpy(cp_tmp, _items[i], lengths[i]);
695 cp_tmp += lengths[i];
696 *cp_tmp++ = separator;
697 }
698 }
699 *--cp_tmp = '\0'; // Replace the extra separator.
700 return cp;
701 }
702
703 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
704 char*
705 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
706 char *cp;
707
708 assert(str != NULL, "just checking");
709 if (path == NULL) {
710 size_t len = strlen(str) + 1;
711 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
712 memcpy(cp, str, len); // copy the trailing null
713 } else {
714 const char separator = *os::path_separator();
715 size_t old_len = strlen(path);
716 size_t str_len = strlen(str);
717 size_t len = old_len + str_len + 2;
718
719 if (prepend) {
720 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
721 char* cp_tmp = cp;
722 memcpy(cp_tmp, str, str_len);
723 cp_tmp += str_len;
724 *cp_tmp = separator;
725 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
726 FREE_C_HEAP_ARRAY(char, path);
727 } else {
728 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
729 char* cp_tmp = cp + old_len;
730 *cp_tmp = separator;
731 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
732 }
733 }
734 return cp;
735 }
736
737 // Scan the directory and append any jar or zip files found to path.
738 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
739 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
740 DIR* dir = os::opendir(directory);
741 if (dir == NULL) return path;
742
743 char dir_sep[2] = { '\0', '\0' };
744 size_t directory_len = strlen(directory);
745 const char fileSep = *os::file_separator();
746 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
747
748 /* Scan the directory for jars/zips, appending them to path. */
749 struct dirent *entry;
750 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
751 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
752 const char* name = entry->d_name;
753 const char* ext = name + strlen(name) - 4;
754 bool isJarOrZip = ext > name &&
755 (os::file_name_strcmp(ext, ".jar") == 0 ||
756 os::file_name_strcmp(ext, ".zip") == 0);
757 if (isJarOrZip) {
758 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
759 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
760 path = add_to_path(path, jarpath, false);
761 FREE_C_HEAP_ARRAY(char, jarpath);
762 }
763 }
764 FREE_C_HEAP_ARRAY(char, dbuf);
765 os::closedir(dir);
766 return path;
767 }
768
769 // Parses a memory size specification string.
770 static bool atomull(const char *s, julong* result) {
771 julong n = 0;
772 int args_read = 0;
773 bool is_hex = false;
774 // Skip leading 0[xX] for hexadecimal
775 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
776 s += 2;
777 is_hex = true;
778 args_read = sscanf(s, JULONG_FORMAT_X, &n);
779 } else {
780 args_read = sscanf(s, JULONG_FORMAT, &n);
781 }
782 if (args_read != 1) {
783 return false;
784 }
785 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
786 s++;
787 }
788 // 4705540: illegal if more characters are found after the first non-digit
789 if (strlen(s) > 1) {
790 return false;
791 }
792 switch (*s) {
793 case 'T': case 't':
794 *result = n * G * K;
795 // Check for overflow.
796 if (*result/((julong)G * K) != n) return false;
797 return true;
798 case 'G': case 'g':
799 *result = n * G;
800 if (*result/G != n) return false;
801 return true;
802 case 'M': case 'm':
803 *result = n * M;
804 if (*result/M != n) return false;
805 return true;
806 case 'K': case 'k':
807 *result = n * K;
808 if (*result/K != n) return false;
809 return true;
810 case '\0':
811 *result = n;
812 return true;
813 default:
814 return false;
815 }
816 }
817
818 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
819 if (size < min_size) return arg_too_small;
820 // Check that size will fit in a size_t (only relevant on 32-bit)
821 if (size > max_uintx) return arg_too_big;
822 return arg_in_range;
823 }
824
825 // Describe an argument out of range error
826 void Arguments::describe_range_error(ArgsRange errcode) {
827 switch(errcode) {
828 case arg_too_big:
829 jio_fprintf(defaultStream::error_stream(),
830 "The specified size exceeds the maximum "
831 "representable size.\n");
832 break;
833 case arg_too_small:
834 case arg_unreadable:
835 case arg_in_range:
836 // do nothing for now
837 break;
838 default:
839 ShouldNotReachHere();
840 }
841 }
842
843 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
844 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
845 return true;
846 } else {
847 return false;
848 }
849 }
850
851 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
852 char* end;
853 errno = 0;
854 double v = strtod(value, &end);
855 if ((errno != 0) || (*end != 0)) {
856 return false;
857 }
858
859 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
860 return true;
861 }
862 return false;
863 }
864
865 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
866 julong v;
867 int int_v;
868 intx intx_v;
869 bool is_neg = false;
870 Flag* result = Flag::find_flag(name, strlen(name));
871
872 if (result == NULL) {
873 return false;
874 }
875
876 // Check the sign first since atomull() parses only unsigned values.
877 if (*value == '-') {
878 if (!result->is_intx() && !result->is_int()) {
879 return false;
880 }
881 value++;
882 is_neg = true;
883 }
884 if (!atomull(value, &v)) {
885 return false;
886 }
887 if (result->is_int()) {
888 int_v = (int) v;
889 if (is_neg) {
890 int_v = -int_v;
891 }
892 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
893 } else if (result->is_uint()) {
894 uint uint_v = (uint) v;
895 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
896 } else if (result->is_intx()) {
897 intx_v = (intx) v;
898 if (is_neg) {
899 intx_v = -intx_v;
900 }
901 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
902 } else if (result->is_uintx()) {
903 uintx uintx_v = (uintx) v;
904 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
905 } else if (result->is_uint64_t()) {
906 uint64_t uint64_t_v = (uint64_t) v;
907 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
908 } else if (result->is_size_t()) {
909 size_t size_t_v = (size_t) v;
910 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
911 } else {
912 return false;
913 }
914 }
915
916 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
917 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
918 // Contract: CommandLineFlags always returns a pointer that needs freeing.
919 FREE_C_HEAP_ARRAY(char, value);
920 return true;
921 }
922
923 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
924 const char* old_value = "";
925 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
926 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
927 size_t new_len = strlen(new_value);
928 const char* value;
929 char* free_this_too = NULL;
930 if (old_len == 0) {
931 value = new_value;
932 } else if (new_len == 0) {
933 value = old_value;
934 } else {
935 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
936 // each new setting adds another LINE to the switch:
937 sprintf(buf, "%s\n%s", old_value, new_value);
938 value = buf;
939 free_this_too = buf;
940 }
941 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
942 // CommandLineFlags always returns a pointer that needs freeing.
943 FREE_C_HEAP_ARRAY(char, value);
944 if (free_this_too != NULL) {
945 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
946 FREE_C_HEAP_ARRAY(char, free_this_too);
947 }
948 return true;
949 }
950
951 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
952 const char* real_name = real_flag_name(arg);
953 JDK_Version since = JDK_Version();
954 switch (is_deprecated_flag(arg, &since)) {
955 case -1:
956 return NULL; // obsolete or expired, don't process normally
957 case 0:
958 return real_name;
959 case 1: {
960 if (warn) {
961 char version[256];
962 since.to_string(version, sizeof(version));
963 if (real_name != arg) {
964 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
965 arg, version, real_name);
966 } else {
967 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
968 arg, version);
969 }
970 }
971 return real_name;
972 }
973 }
974 ShouldNotReachHere();
975 return NULL;
976 }
977
978 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name){
979 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
980 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
981 if (strcmp(alf.alias_name, name) == 0) {
982 return alf;
983 }
984 }
985 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
986 return a;
987 }
988
989 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
990
991 // range of acceptable characters spelled out for portability reasons
992 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
993 #define BUFLEN 255
994 char name[BUFLEN+1];
995 char dummy;
996 const char* real_name;
997 bool warn_if_deprecated = true;
998
999 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1000 AliasedLoggingFlag alf = catch_logging_aliases(name);
1001 if (alf.alias_name != NULL){
1002 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1003 return true;
1004 }
1005 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1006 if (real_name == NULL) {
1007 return false;
1008 }
1009 return set_bool_flag(real_name, false, origin);
1010 }
1011 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1012 AliasedLoggingFlag alf = catch_logging_aliases(name);
1013 if (alf.alias_name != NULL){
1014 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1015 return true;
1016 }
1017 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1018 if (real_name == NULL) {
1019 return false;
1020 }
1021 return set_bool_flag(real_name, true, origin);
1022 }
1023
1024 char punct;
1025 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1026 const char* value = strchr(arg, '=') + 1;
1027 Flag* flag;
1028
1029 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1030 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1031 if (real_name == NULL) {
1032 return false;
1033 }
1034 flag = Flag::find_flag(real_name);
1035 if (flag != NULL && flag->is_ccstr()) {
1036 if (flag->ccstr_accumulates()) {
1037 return append_to_string_flag(real_name, value, origin);
1038 } else {
1039 if (value[0] == '\0') {
1040 value = NULL;
1041 }
1042 return set_string_flag(real_name, value, origin);
1043 }
1044 } else {
1045 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1046 }
1047 }
1048
1049 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1050 const char* value = strchr(arg, '=') + 1;
1051 // -XX:Foo:=xxx will reset the string flag to the given value.
1052 if (value[0] == '\0') {
1053 value = NULL;
1054 }
1055 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1056 if (real_name == NULL) {
1057 return false;
1058 }
1059 return set_string_flag(real_name, value, origin);
1060 }
1061
1062 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1063 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1064 #define NUMBER_RANGE "[0123456789eE+-]"
1065 char value[BUFLEN + 1];
1066 char value2[BUFLEN + 1];
1067 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1068 // Looks like a floating-point number -- try again with more lenient format string
1069 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1070 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1071 if (real_name == NULL) {
1072 return false;
1073 }
1074 return set_fp_numeric_flag(real_name, value, origin);
1075 }
1076 }
1077
1078 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1079 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1080 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1081 if (real_name == NULL) {
1082 return false;
1083 }
1084 return set_numeric_flag(real_name, value, origin);
1085 }
1086
1087 return false;
1088 }
1089
1090 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1091 assert(bldarray != NULL, "illegal argument");
1092
1093 if (arg == NULL) {
1094 return;
1095 }
1096
1097 int new_count = *count + 1;
1098
1099 // expand the array and add arg to the last element
1100 if (*bldarray == NULL) {
1101 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1102 } else {
1103 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1104 }
1105 (*bldarray)[*count] = os::strdup_check_oom(arg);
1106 *count = new_count;
1107 }
1108
1109 void Arguments::build_jvm_args(const char* arg) {
1110 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1111 }
1112
1113 void Arguments::build_jvm_flags(const char* arg) {
1114 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1115 }
1116
1117 // utility function to return a string that concatenates all
1118 // strings in a given char** array
1119 const char* Arguments::build_resource_string(char** args, int count) {
1120 if (args == NULL || count == 0) {
1121 return NULL;
1122 }
1123 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1124 for (int i = 1; i < count; i++) {
1125 length += strlen(args[i]) + 1; // add 1 for a space
1126 }
1127 char* s = NEW_RESOURCE_ARRAY(char, length);
1128 strcpy(s, args[0]);
1129 for (int j = 1; j < count; j++) {
1130 strcat(s, " ");
1131 strcat(s, args[j]);
1132 }
1133 return (const char*) s;
1134 }
1135
1136 void Arguments::print_on(outputStream* st) {
1137 st->print_cr("VM Arguments:");
1138 if (num_jvm_flags() > 0) {
1139 st->print("jvm_flags: "); print_jvm_flags_on(st);
1140 st->cr();
1141 }
1142 if (num_jvm_args() > 0) {
1143 st->print("jvm_args: "); print_jvm_args_on(st);
1144 st->cr();
1145 }
1146 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1147 if (_java_class_path != NULL) {
1148 char* path = _java_class_path->value();
1149 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1150 }
1151 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1152 }
1153
1154 void Arguments::print_summary_on(outputStream* st) {
1155 // Print the command line. Environment variables that are helpful for
1156 // reproducing the problem are written later in the hs_err file.
1157 // flags are from setting file
1158 if (num_jvm_flags() > 0) {
1159 st->print_raw("Settings File: ");
1160 print_jvm_flags_on(st);
1161 st->cr();
1162 }
1163 // args are the command line and environment variable arguments.
1164 st->print_raw("Command Line: ");
1165 if (num_jvm_args() > 0) {
1166 print_jvm_args_on(st);
1167 }
1168 // this is the classfile and any arguments to the java program
1169 if (java_command() != NULL) {
1170 st->print("%s", java_command());
1171 }
1172 st->cr();
1173 }
1174
1175 void Arguments::print_jvm_flags_on(outputStream* st) {
1176 if (_num_jvm_flags > 0) {
1177 for (int i=0; i < _num_jvm_flags; i++) {
1178 st->print("%s ", _jvm_flags_array[i]);
1179 }
1180 }
1181 }
1182
1183 void Arguments::print_jvm_args_on(outputStream* st) {
1184 if (_num_jvm_args > 0) {
1185 for (int i=0; i < _num_jvm_args; i++) {
1186 st->print("%s ", _jvm_args_array[i]);
1187 }
1188 }
1189 }
1190
1191 bool Arguments::process_argument(const char* arg,
1192 jboolean ignore_unrecognized,
1193 Flag::Flags origin) {
1194 JDK_Version since = JDK_Version();
1195
1196 if (parse_argument(arg, origin)) {
1197 return true;
1198 }
1199
1200 // Determine if the flag has '+', '-', or '=' characters.
1201 bool has_plus_minus = (*arg == '+' || *arg == '-');
1202 const char* const argname = has_plus_minus ? arg + 1 : arg;
1203
1204 size_t arg_len;
1205 const char* equal_sign = strchr(argname, '=');
1206 if (equal_sign == NULL) {
1207 arg_len = strlen(argname);
1208 } else {
1209 arg_len = equal_sign - argname;
1210 }
1211
1212 // Only make the obsolete check for valid arguments.
1213 if (arg_len <= BUFLEN) {
1214 // Construct a string which consists only of the argument name without '+', '-', or '='.
1215 char stripped_argname[BUFLEN+1];
1216 strncpy(stripped_argname, argname, arg_len);
1217 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1218 if (is_obsolete_flag(stripped_argname, &since)) {
1219 char version[256];
1220 since.to_string(version, sizeof(version));
1221 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1222 return true;
1223 }
1224 #ifndef PRODUCT
1225 else {
1226 const char* replacement;
1227 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1228 jio_fprintf(defaultStream::error_stream(),
1229 "%s has been removed. Please use %s instead.\n", stripped_argname, replacement);
1230 return false;
1231 }
1232 }
1233 #endif //PRODUCT
1234 }
1235
1236 // For locked flags, report a custom error message if available.
1237 // Otherwise, report the standard unrecognized VM option.
1238 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1239 if (found_flag != NULL) {
1240 char locked_message_buf[BUFLEN];
1241 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1242 if (strlen(locked_message_buf) == 0) {
1243 if (found_flag->is_bool() && !has_plus_minus) {
1244 jio_fprintf(defaultStream::error_stream(),
1245 "Missing +/- setting for VM option '%s'\n", argname);
1246 } else if (!found_flag->is_bool() && has_plus_minus) {
1247 jio_fprintf(defaultStream::error_stream(),
1248 "Unexpected +/- setting in VM option '%s'\n", argname);
1249 } else {
1250 jio_fprintf(defaultStream::error_stream(),
1251 "Improperly specified VM option '%s'\n", argname);
1252 }
1253 } else {
1254 #ifdef PRODUCT
1255 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1256 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1257 if (ignore_unrecognized && mismatched) {
1258 return true;
1259 }
1260 #endif
1261 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1262 }
1263 } else {
1264 if (ignore_unrecognized) {
1265 return true;
1266 }
1267 jio_fprintf(defaultStream::error_stream(),
1268 "Unrecognized VM option '%s'\n", argname);
1269 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1270 if (fuzzy_matched != NULL) {
1271 jio_fprintf(defaultStream::error_stream(),
1272 "Did you mean '%s%s%s'? ",
1273 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1274 fuzzy_matched->_name,
1275 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1276 }
1277 }
1278
1279 // allow for commandline "commenting out" options like -XX:#+Verbose
1280 return arg[0] == '#';
1281 }
1282
1283 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1284 FILE* stream = fopen(file_name, "rb");
1285 if (stream == NULL) {
1286 if (should_exist) {
1287 jio_fprintf(defaultStream::error_stream(),
1288 "Could not open settings file %s\n", file_name);
1289 return false;
1290 } else {
1291 return true;
1292 }
1293 }
1294
1295 char token[1024];
1296 int pos = 0;
1297
1298 bool in_white_space = true;
1299 bool in_comment = false;
1300 bool in_quote = false;
1301 char quote_c = 0;
1302 bool result = true;
1303
1304 int c = getc(stream);
1305 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1306 if (in_white_space) {
1307 if (in_comment) {
1308 if (c == '\n') in_comment = false;
1309 } else {
1310 if (c == '#') in_comment = true;
1311 else if (!isspace(c)) {
1312 in_white_space = false;
1313 token[pos++] = c;
1314 }
1315 }
1316 } else {
1317 if (c == '\n' || (!in_quote && isspace(c))) {
1318 // token ends at newline, or at unquoted whitespace
1319 // this allows a way to include spaces in string-valued options
1320 token[pos] = '\0';
1321 logOption(token);
1322 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1323 build_jvm_flags(token);
1324 pos = 0;
1325 in_white_space = true;
1326 in_quote = false;
1327 } else if (!in_quote && (c == '\'' || c == '"')) {
1328 in_quote = true;
1329 quote_c = c;
1330 } else if (in_quote && (c == quote_c)) {
1331 in_quote = false;
1332 } else {
1333 token[pos++] = c;
1334 }
1335 }
1336 c = getc(stream);
1337 }
1338 if (pos > 0) {
1339 token[pos] = '\0';
1340 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1341 build_jvm_flags(token);
1342 }
1343 fclose(stream);
1344 return result;
1345 }
1346
1347 //=============================================================================================================
1348 // Parsing of properties (-D)
1349
1350 const char* Arguments::get_property(const char* key) {
1351 return PropertyList_get_value(system_properties(), key);
1352 }
1353
1354 bool Arguments::add_property(const char* prop) {
1355 const char* eq = strchr(prop, '=');
1356 const char* key;
1357 const char* value = "";
1358
1359 if (eq == NULL) {
1360 // property doesn't have a value, thus use passed string
1361 key = prop;
1362 } else {
1363 // property have a value, thus extract it and save to the
1364 // allocated string
1365 size_t key_len = eq - prop;
1366 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1367
1368 strncpy(tmp_key, prop, key_len);
1369 tmp_key[key_len] = '\0';
1370 key = tmp_key;
1371
1372 value = &prop[key_len + 1];
1373 }
1374
1375 if (strcmp(key, "java.compiler") == 0) {
1376 process_java_compiler_argument(value);
1377 // Record value in Arguments, but let it get passed to Java.
1378 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1379 strcmp(key, "sun.java.launcher.pid") == 0) {
1380 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1381 // private and are processed in process_sun_java_launcher_properties();
1382 // the sun.java.launcher property is passed on to the java application
1383 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1384 PropertyList_unique_add(&_system_properties, key, value, true);
1385 } else {
1386 if (strcmp(key, "sun.java.command") == 0) {
1387 char *old_java_command = _java_command;
1388 _java_command = os::strdup_check_oom(value, mtInternal);
1389 if (old_java_command != NULL) {
1390 os::free(old_java_command);
1391 }
1392 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1393 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1394 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1395 // its value without going through the property list or making a Java call.
1396 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1397 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1398 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1399 os::free((void *)old_java_vendor_url_bug);
1400 }
1401 }
1402
1403 // Create new property and add at the end of the list
1404 PropertyList_unique_add(&_system_properties, key, value);
1405 }
1406
1407 if (key != prop) {
1408 // SystemProperty copy passed value, thus free previously allocated
1409 // memory
1410 FreeHeap((void *)key);
1411 }
1412
1413 return true;
1414 }
1415
1416 //===========================================================================================================
1417 // Setting int/mixed/comp mode flags
1418
1419 void Arguments::set_mode_flags(Mode mode) {
1420 // Set up default values for all flags.
1421 // If you add a flag to any of the branches below,
1422 // add a default value for it here.
1423 set_java_compiler(false);
1424 _mode = mode;
1425
1426 // Ensure Agent_OnLoad has the correct initial values.
1427 // This may not be the final mode; mode may change later in onload phase.
1428 PropertyList_unique_add(&_system_properties, "java.vm.info",
1429 VM_Version::vm_info_string(), false);
1430
1431 UseInterpreter = true;
1432 UseCompiler = true;
1433 UseLoopCounter = true;
1434
1435 // Default values may be platform/compiler dependent -
1436 // use the saved values
1437 ClipInlining = Arguments::_ClipInlining;
1438 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1439 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1440 BackgroundCompilation = Arguments::_BackgroundCompilation;
1441 if (TieredCompilation) {
1442 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1443 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1444 }
1445 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1446 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1447 }
1448 }
1449
1450 // Change from defaults based on mode
1451 switch (mode) {
1452 default:
1453 ShouldNotReachHere();
1454 break;
1455 case _int:
1456 UseCompiler = false;
1457 UseLoopCounter = false;
1458 AlwaysCompileLoopMethods = false;
1459 UseOnStackReplacement = false;
1460 break;
1461 case _mixed:
1462 // same as default
1463 break;
1464 case _comp:
1465 UseInterpreter = false;
1466 BackgroundCompilation = false;
1467 ClipInlining = false;
1468 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1469 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1470 // compile a level 4 (C2) and then continue executing it.
1471 if (TieredCompilation) {
1472 Tier3InvokeNotifyFreqLog = 0;
1473 Tier4InvocationThreshold = 0;
1474 }
1475 break;
1476 }
1477 }
1478
1479 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1480 // Conflict: required to use shared spaces (-Xshare:on), but
1481 // incompatible command line options were chosen.
1482
1483 static void no_shared_spaces(const char* message) {
1484 if (RequireSharedSpaces) {
1485 jio_fprintf(defaultStream::error_stream(),
1486 "Class data sharing is inconsistent with other specified options.\n");
1487 vm_exit_during_initialization("Unable to use shared archive.", message);
1488 } else {
1489 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1490 }
1491 }
1492 #endif
1493
1494 // Returns threshold scaled with the value of scale.
1495 // If scale < 0.0, threshold is returned without scaling.
1496 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1497 if (scale == 1.0 || scale < 0.0) {
1498 return threshold;
1499 } else {
1500 return (intx)(threshold * scale);
1501 }
1502 }
1503
1504 // Returns freq_log scaled with the value of scale.
1505 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1506 // If scale < 0.0, freq_log is returned without scaling.
1507 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1508 // Check if scaling is necessary or if negative value was specified.
1509 if (scale == 1.0 || scale < 0.0) {
1510 return freq_log;
1511 }
1512 // Check values to avoid calculating log2 of 0.
1513 if (scale == 0.0 || freq_log == 0) {
1514 return 0;
1515 }
1516 // Determine the maximum notification frequency value currently supported.
1517 // The largest mask value that the interpreter/C1 can handle is
1518 // of length InvocationCounter::number_of_count_bits. Mask values are always
1519 // one bit shorter then the value of the notification frequency. Set
1520 // max_freq_bits accordingly.
1521 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1522 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1523 if (scaled_freq == 0) {
1524 // Return 0 right away to avoid calculating log2 of 0.
1525 return 0;
1526 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1527 return max_freq_bits;
1528 } else {
1529 return log2_intptr(scaled_freq);
1530 }
1531 }
1532
1533 void Arguments::set_tiered_flags() {
1534 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1535 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1536 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1537 }
1538 if (CompilationPolicyChoice < 2) {
1539 vm_exit_during_initialization(
1540 "Incompatible compilation policy selected", NULL);
1541 }
1542 // Increase the code cache size - tiered compiles a lot more.
1543 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1544 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1545 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1546 }
1547 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1548 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1549 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1550 }
1551 if (!UseInterpreter) { // -Xcomp
1552 Tier3InvokeNotifyFreqLog = 0;
1553 Tier4InvocationThreshold = 0;
1554 }
1555
1556 if (CompileThresholdScaling < 0) {
1557 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1558 }
1559
1560 // Scale tiered compilation thresholds.
1561 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1562 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1563 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1564 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1565
1566 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1567 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1568 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1569 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1570
1571 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1572 // once these thresholds become supported.
1573
1574 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1575 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1576
1577 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1578 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1579
1580 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1581
1582 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1583 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1584 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1585 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1586 }
1587 }
1588
1589 #if INCLUDE_ALL_GCS
1590 static void disable_adaptive_size_policy(const char* collector_name) {
1591 if (UseAdaptiveSizePolicy) {
1592 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1593 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1594 collector_name);
1595 }
1596 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1597 }
1598 }
1599
1600 void Arguments::set_parnew_gc_flags() {
1601 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1602 "control point invariant");
1603 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1604 assert(UseParNewGC, "ParNew should always be used with CMS");
1605
1606 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1607 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1608 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1609 } else if (ParallelGCThreads == 0) {
1610 jio_fprintf(defaultStream::error_stream(),
1611 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1612 vm_exit(1);
1613 }
1614
1615 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1616 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1617 // we set them to 1024 and 1024.
1618 // See CR 6362902.
1619 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1620 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1621 }
1622 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1623 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1624 }
1625
1626 // When using compressed oops, we use local overflow stacks,
1627 // rather than using a global overflow list chained through
1628 // the klass word of the object's pre-image.
1629 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1630 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1631 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1632 }
1633 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1634 }
1635 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1636 }
1637
1638 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1639 // sparc/solaris for certain applications, but would gain from
1640 // further optimization and tuning efforts, and would almost
1641 // certainly gain from analysis of platform and environment.
1642 void Arguments::set_cms_and_parnew_gc_flags() {
1643 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1644 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1645 assert(UseParNewGC, "ParNew should always be used with CMS");
1646
1647 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1648 disable_adaptive_size_policy("UseConcMarkSweepGC");
1649
1650 set_parnew_gc_flags();
1651
1652 size_t max_heap = align_size_down(MaxHeapSize,
1653 CardTableRS::ct_max_alignment_constraint());
1654
1655 // Now make adjustments for CMS
1656 intx tenuring_default = (intx)6;
1657 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1658
1659 // Preferred young gen size for "short" pauses:
1660 // upper bound depends on # of threads and NewRatio.
1661 const size_t preferred_max_new_size_unaligned =
1662 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1663 size_t preferred_max_new_size =
1664 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1665
1666 // Unless explicitly requested otherwise, size young gen
1667 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1668
1669 // If either MaxNewSize or NewRatio is set on the command line,
1670 // assume the user is trying to set the size of the young gen.
1671 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1672
1673 // Set MaxNewSize to our calculated preferred_max_new_size unless
1674 // NewSize was set on the command line and it is larger than
1675 // preferred_max_new_size.
1676 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1677 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1678 } else {
1679 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1680 }
1681 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1682
1683 // Code along this path potentially sets NewSize and OldSize
1684 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1685 min_heap_size(), InitialHeapSize, max_heap);
1686 size_t min_new = preferred_max_new_size;
1687 if (FLAG_IS_CMDLINE(NewSize)) {
1688 min_new = NewSize;
1689 }
1690 if (max_heap > min_new && min_heap_size() > min_new) {
1691 // Unless explicitly requested otherwise, make young gen
1692 // at least min_new, and at most preferred_max_new_size.
1693 if (FLAG_IS_DEFAULT(NewSize)) {
1694 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1695 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1696 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1697 }
1698 // Unless explicitly requested otherwise, size old gen
1699 // so it's NewRatio x of NewSize.
1700 if (FLAG_IS_DEFAULT(OldSize)) {
1701 if (max_heap > NewSize) {
1702 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1703 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1704 }
1705 }
1706 }
1707 }
1708 // Unless explicitly requested otherwise, definitely
1709 // promote all objects surviving "tenuring_default" scavenges.
1710 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1711 FLAG_IS_DEFAULT(SurvivorRatio)) {
1712 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1713 }
1714 // If we decided above (or user explicitly requested)
1715 // `promote all' (via MaxTenuringThreshold := 0),
1716 // prefer minuscule survivor spaces so as not to waste
1717 // space for (non-existent) survivors
1718 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1719 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1720 }
1721
1722 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1723 // but rather the number of free blocks of a given size that are used when
1724 // replenishing the local per-worker free list caches.
1725 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1726 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1727 // OldPLAB sizing manually turned off: Use a larger default setting,
1728 // unless it was manually specified. This is because a too-low value
1729 // will slow down scavenges.
1730 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1731 } else {
1732 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1733 }
1734 }
1735
1736 // If either of the static initialization defaults have changed, note this
1737 // modification.
1738 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1739 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1740 }
1741
1742 if (!ClassUnloading) {
1743 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1744 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1745 }
1746
1747 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1748 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1749 }
1750 #endif // INCLUDE_ALL_GCS
1751
1752 void set_object_alignment() {
1753 // Object alignment.
1754 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1755 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1756 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1757 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1758 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1759 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1760
1761 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1762 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1763
1764 // Oop encoding heap max
1765 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1766
1767 if (SurvivorAlignmentInBytes == 0) {
1768 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1769 }
1770
1771 #if INCLUDE_ALL_GCS
1772 // Set CMS global values
1773 CompactibleFreeListSpace::set_cms_values();
1774 #endif // INCLUDE_ALL_GCS
1775 }
1776
1777 size_t Arguments::max_heap_for_compressed_oops() {
1778 // Avoid sign flip.
1779 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1780 // We need to fit both the NULL page and the heap into the memory budget, while
1781 // keeping alignment constraints of the heap. To guarantee the latter, as the
1782 // NULL page is located before the heap, we pad the NULL page to the conservative
1783 // maximum alignment that the GC may ever impose upon the heap.
1784 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1785 _conservative_max_heap_alignment);
1786
1787 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1788 NOT_LP64(ShouldNotReachHere(); return 0);
1789 }
1790
1791 bool Arguments::should_auto_select_low_pause_collector() {
1792 if (UseAutoGCSelectPolicy &&
1793 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1794 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1795 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1796 return true;
1797 }
1798 return false;
1799 }
1800
1801 void Arguments::set_use_compressed_oops() {
1802 #ifndef ZERO
1803 #ifdef _LP64
1804 // MaxHeapSize is not set up properly at this point, but
1805 // the only value that can override MaxHeapSize if we are
1806 // to use UseCompressedOops is InitialHeapSize.
1807 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1808
1809 if (max_heap_size <= max_heap_for_compressed_oops()) {
1810 #if !defined(COMPILER1) || defined(TIERED)
1811 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1812 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1813 }
1814 #endif
1815 } else {
1816 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1817 warning("Max heap size too large for Compressed Oops");
1818 FLAG_SET_DEFAULT(UseCompressedOops, false);
1819 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1820 }
1821 }
1822 #endif // _LP64
1823 #endif // ZERO
1824 }
1825
1826
1827 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1828 // set_use_compressed_oops().
1829 void Arguments::set_use_compressed_klass_ptrs() {
1830 #ifndef ZERO
1831 #ifdef _LP64
1832 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1833 if (!UseCompressedOops) {
1834 if (UseCompressedClassPointers) {
1835 warning("UseCompressedClassPointers requires UseCompressedOops");
1836 }
1837 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1838 } else {
1839 // Turn on UseCompressedClassPointers too
1840 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1841 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1842 }
1843 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1844 if (UseCompressedClassPointers) {
1845 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1846 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1847 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1848 }
1849 }
1850 }
1851 #endif // _LP64
1852 #endif // !ZERO
1853 }
1854
1855 void Arguments::set_conservative_max_heap_alignment() {
1856 // The conservative maximum required alignment for the heap is the maximum of
1857 // the alignments imposed by several sources: any requirements from the heap
1858 // itself, the collector policy and the maximum page size we may run the VM
1859 // with.
1860 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1861 #if INCLUDE_ALL_GCS
1862 if (UseParallelGC) {
1863 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1864 } else if (UseG1GC) {
1865 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1866 }
1867 #endif // INCLUDE_ALL_GCS
1868 _conservative_max_heap_alignment = MAX4(heap_alignment,
1869 (size_t)os::vm_allocation_granularity(),
1870 os::max_page_size(),
1871 CollectorPolicy::compute_heap_alignment());
1872 }
1873
1874 void Arguments::select_gc_ergonomically() {
1875 if (os::is_server_class_machine()) {
1876 if (should_auto_select_low_pause_collector()) {
1877 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1878 } else {
1879 #if defined(JAVASE_EMBEDDED)
1880 FLAG_SET_ERGO(bool, UseParallelGC, true);
1881 #else
1882 FLAG_SET_ERGO(bool, UseG1GC, true);
1883 #endif
1884 }
1885 } else {
1886 FLAG_SET_ERGO(bool, UseSerialGC, true);
1887 }
1888 }
1889
1890 void Arguments::select_gc() {
1891 if (!gc_selected()) {
1892 select_gc_ergonomically();
1893 guarantee(gc_selected(), "No GC selected");
1894 }
1895 }
1896
1897 void Arguments::set_ergonomics_flags() {
1898 select_gc();
1899
1900 #if defined(COMPILER2) || INCLUDE_JVMCI
1901 // Shared spaces work fine with other GCs but causes bytecode rewriting
1902 // to be disabled, which hurts interpreter performance and decreases
1903 // server performance. When -server is specified, keep the default off
1904 // unless it is asked for. Future work: either add bytecode rewriting
1905 // at link time, or rewrite bytecodes in non-shared methods.
1906 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1907 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1908 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1909 }
1910 #endif
1911
1912 set_conservative_max_heap_alignment();
1913
1914 #ifndef ZERO
1915 #ifdef _LP64
1916 set_use_compressed_oops();
1917
1918 // set_use_compressed_klass_ptrs() must be called after calling
1919 // set_use_compressed_oops().
1920 set_use_compressed_klass_ptrs();
1921
1922 // Also checks that certain machines are slower with compressed oops
1923 // in vm_version initialization code.
1924 #endif // _LP64
1925 #endif // !ZERO
1926
1927 CodeCacheExtensions::set_ergonomics_flags();
1928 }
1929
1930 void Arguments::set_parallel_gc_flags() {
1931 assert(UseParallelGC || UseParallelOldGC, "Error");
1932 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1933 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1934 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1935 }
1936 FLAG_SET_DEFAULT(UseParallelGC, true);
1937
1938 // If no heap maximum was requested explicitly, use some reasonable fraction
1939 // of the physical memory, up to a maximum of 1GB.
1940 FLAG_SET_DEFAULT(ParallelGCThreads,
1941 Abstract_VM_Version::parallel_worker_threads());
1942 if (ParallelGCThreads == 0) {
1943 jio_fprintf(defaultStream::error_stream(),
1944 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1945 vm_exit(1);
1946 }
1947
1948 if (UseAdaptiveSizePolicy) {
1949 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1950 // unless the user actually sets these flags.
1951 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1952 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1953 }
1954 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1955 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1956 }
1957 }
1958
1959 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1960 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1961 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1962 // See CR 6362902 for details.
1963 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1964 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1965 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1966 }
1967 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1968 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1969 }
1970 }
1971
1972 if (UseParallelOldGC) {
1973 // Par compact uses lower default values since they are treated as
1974 // minimums. These are different defaults because of the different
1975 // interpretation and are not ergonomically set.
1976 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1977 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1978 }
1979 }
1980 }
1981
1982 void Arguments::set_g1_gc_flags() {
1983 assert(UseG1GC, "Error");
1984 #if defined(COMPILER1) || INCLUDE_JVMCI
1985 FastTLABRefill = false;
1986 #endif
1987 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1988 if (ParallelGCThreads == 0) {
1989 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1990 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1991 }
1992
1993 #if INCLUDE_ALL_GCS
1994 if (G1ConcRefinementThreads == 0) {
1995 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1996 }
1997 #endif
1998
1999 // MarkStackSize will be set (if it hasn't been set by the user)
2000 // when concurrent marking is initialized.
2001 // Its value will be based upon the number of parallel marking threads.
2002 // But we do set the maximum mark stack size here.
2003 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
2004 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
2005 }
2006
2007 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
2008 // In G1, we want the default GC overhead goal to be higher than
2009 // it is for PS, or the heap might be expanded too aggressively.
2010 // We set it here to ~8%.
2011 FLAG_SET_DEFAULT(GCTimeRatio, 12);
2012 }
2013
2014 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
2015 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
2016 }
2017
2018 #if !INCLUDE_ALL_GCS
2019 #ifdef ASSERT
2020 static bool verify_serial_gc_flags() {
2021 return (UseSerialGC &&
2022 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
2023 UseParallelGC || UseParallelOldGC));
2024 }
2025 #endif // ASSERT
2026 #endif // INCLUDE_ALL_GCS
2027
2028 void Arguments::set_gc_specific_flags() {
2029 #if INCLUDE_ALL_GCS
2030 // Set per-collector flags
2031 if (UseParallelGC || UseParallelOldGC) {
2032 set_parallel_gc_flags();
2033 } else if (UseConcMarkSweepGC) {
2034 set_cms_and_parnew_gc_flags();
2035 } else if (UseG1GC) {
2036 set_g1_gc_flags();
2037 }
2038 if (AssumeMP && !UseSerialGC) {
2039 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2040 warning("If the number of processors is expected to increase from one, then"
2041 " you should configure the number of parallel GC threads appropriately"
2042 " using -XX:ParallelGCThreads=N");
2043 }
2044 }
2045 if (MinHeapFreeRatio == 100) {
2046 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2047 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2048 }
2049 #else // INCLUDE_ALL_GCS
2050 assert(verify_serial_gc_flags(), "SerialGC unset");
2051 #endif // INCLUDE_ALL_GCS
2052 }
2053
2054 julong Arguments::limit_by_allocatable_memory(julong limit) {
2055 julong max_allocatable;
2056 julong result = limit;
2057 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2058 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2059 }
2060 return result;
2061 }
2062
2063 // Use static initialization to get the default before parsing
2064 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2065
2066 void Arguments::set_heap_size() {
2067 const julong phys_mem =
2068 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2069 : (julong)MaxRAM;
2070
2071 // If the maximum heap size has not been set with -Xmx,
2072 // then set it as fraction of the size of physical memory,
2073 // respecting the maximum and minimum sizes of the heap.
2074 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2075 julong reasonable_max = phys_mem / MaxRAMFraction;
2076
2077 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2078 // Small physical memory, so use a minimum fraction of it for the heap
2079 reasonable_max = phys_mem / MinRAMFraction;
2080 } else {
2081 // Not-small physical memory, so require a heap at least
2082 // as large as MaxHeapSize
2083 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2084 }
2085 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2086 // Limit the heap size to ErgoHeapSizeLimit
2087 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2088 }
2089 if (UseCompressedOops) {
2090 // Limit the heap size to the maximum possible when using compressed oops
2091 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2092
2093 // HeapBaseMinAddress can be greater than default but not less than.
2094 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2095 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2096 // matches compressed oops printing flags
2097 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2098 jio_fprintf(defaultStream::error_stream(),
2099 "HeapBaseMinAddress must be at least " SIZE_FORMAT
2100 " (" SIZE_FORMAT "G) which is greater than value given "
2101 SIZE_FORMAT "\n",
2102 DefaultHeapBaseMinAddress,
2103 DefaultHeapBaseMinAddress/G,
2104 HeapBaseMinAddress);
2105 }
2106 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2107 }
2108 }
2109
2110 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2111 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2112 // but it should be not less than default MaxHeapSize.
2113 max_coop_heap -= HeapBaseMinAddress;
2114 }
2115 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2116 }
2117 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2118
2119 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2120 // An initial heap size was specified on the command line,
2121 // so be sure that the maximum size is consistent. Done
2122 // after call to limit_by_allocatable_memory because that
2123 // method might reduce the allocation size.
2124 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2125 }
2126
2127 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2128 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2129 }
2130
2131 // If the minimum or initial heap_size have not been set or requested to be set
2132 // ergonomically, set them accordingly.
2133 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2134 julong reasonable_minimum = (julong)(OldSize + NewSize);
2135
2136 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2137
2138 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2139
2140 if (InitialHeapSize == 0) {
2141 julong reasonable_initial = phys_mem / InitialRAMFraction;
2142
2143 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2144 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2145
2146 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2147
2148 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2149 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2150 }
2151 // If the minimum heap size has not been set (via -Xms),
2152 // synchronize with InitialHeapSize to avoid errors with the default value.
2153 if (min_heap_size() == 0) {
2154 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2155 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2156 }
2157 }
2158 }
2159
2160 // This option inspects the machine and attempts to set various
2161 // parameters to be optimal for long-running, memory allocation
2162 // intensive jobs. It is intended for machines with large
2163 // amounts of cpu and memory.
2164 jint Arguments::set_aggressive_heap_flags() {
2165 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2166 // VM, but we may not be able to represent the total physical memory
2167 // available (like having 8gb of memory on a box but using a 32bit VM).
2168 // Thus, we need to make sure we're using a julong for intermediate
2169 // calculations.
2170 julong initHeapSize;
2171 julong total_memory = os::physical_memory();
2172
2173 if (total_memory < (julong) 256 * M) {
2174 jio_fprintf(defaultStream::error_stream(),
2175 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2176 vm_exit(1);
2177 }
2178
2179 // The heap size is half of available memory, or (at most)
2180 // all of possible memory less 160mb (leaving room for the OS
2181 // when using ISM). This is the maximum; because adaptive sizing
2182 // is turned on below, the actual space used may be smaller.
2183
2184 initHeapSize = MIN2(total_memory / (julong) 2,
2185 total_memory - (julong) 160 * M);
2186
2187 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2188
2189 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2190 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2191 return JNI_EINVAL;
2192 }
2193 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2194 return JNI_EINVAL;
2195 }
2196 // Currently the minimum size and the initial heap sizes are the same.
2197 set_min_heap_size(initHeapSize);
2198 }
2199 if (FLAG_IS_DEFAULT(NewSize)) {
2200 // Make the young generation 3/8ths of the total heap.
2201 if (FLAG_SET_CMDLINE(size_t, NewSize,
2202 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2203 return JNI_EINVAL;
2204 }
2205 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2206 return JNI_EINVAL;
2207 }
2208 }
2209
2210 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2211 FLAG_SET_DEFAULT(UseLargePages, true);
2212 #endif
2213
2214 // Increase some data structure sizes for efficiency
2215 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2216 return JNI_EINVAL;
2217 }
2218 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2219 return JNI_EINVAL;
2220 }
2221 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2222 return JNI_EINVAL;
2223 }
2224
2225 // See the OldPLABSize comment below, but replace 'after promotion'
2226 // with 'after copying'. YoungPLABSize is the size of the survivor
2227 // space per-gc-thread buffers. The default is 4kw.
2228 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2229 return JNI_EINVAL;
2230 }
2231
2232 // OldPLABSize is the size of the buffers in the old gen that
2233 // UseParallelGC uses to promote live data that doesn't fit in the
2234 // survivor spaces. At any given time, there's one for each gc thread.
2235 // The default size is 1kw. These buffers are rarely used, since the
2236 // survivor spaces are usually big enough. For specjbb, however, there
2237 // are occasions when there's lots of live data in the young gen
2238 // and we end up promoting some of it. We don't have a definite
2239 // explanation for why bumping OldPLABSize helps, but the theory
2240 // is that a bigger PLAB results in retaining something like the
2241 // original allocation order after promotion, which improves mutator
2242 // locality. A minor effect may be that larger PLABs reduce the
2243 // number of PLAB allocation events during gc. The value of 8kw
2244 // was arrived at by experimenting with specjbb.
2245 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2246 return JNI_EINVAL;
2247 }
2248
2249 // Enable parallel GC and adaptive generation sizing
2250 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2251 return JNI_EINVAL;
2252 }
2253 FLAG_SET_DEFAULT(ParallelGCThreads,
2254 Abstract_VM_Version::parallel_worker_threads());
2255
2256 // Encourage steady state memory management
2257 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2258 return JNI_EINVAL;
2259 }
2260
2261 // This appears to improve mutator locality
2262 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2263 return JNI_EINVAL;
2264 }
2265
2266 // Get around early Solaris scheduling bug
2267 // (affinity vs other jobs on system)
2268 // but disallow DR and offlining (5008695).
2269 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2270 return JNI_EINVAL;
2271 }
2272
2273 return JNI_OK;
2274 }
2275
2276 // This must be called after ergonomics.
2277 void Arguments::set_bytecode_flags() {
2278 if (!RewriteBytecodes) {
2279 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2280 }
2281 }
2282
2283 // Aggressive optimization flags -XX:+AggressiveOpts
2284 jint Arguments::set_aggressive_opts_flags() {
2285 #ifdef COMPILER2
2286 if (AggressiveUnboxing) {
2287 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2288 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2289 } else if (!EliminateAutoBox) {
2290 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2291 AggressiveUnboxing = false;
2292 }
2293 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2294 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2295 } else if (!DoEscapeAnalysis) {
2296 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2297 AggressiveUnboxing = false;
2298 }
2299 }
2300 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2301 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2302 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2303 }
2304 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2305 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2306 }
2307
2308 // Feed the cache size setting into the JDK
2309 char buffer[1024];
2310 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2311 if (!add_property(buffer)) {
2312 return JNI_ENOMEM;
2313 }
2314 }
2315 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2316 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2317 }
2318 #endif
2319
2320 if (AggressiveOpts) {
2321 // Sample flag setting code
2322 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2323 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2324 // }
2325 }
2326
2327 return JNI_OK;
2328 }
2329
2330 //===========================================================================================================
2331 // Parsing of java.compiler property
2332
2333 void Arguments::process_java_compiler_argument(const char* arg) {
2334 // For backwards compatibility, Djava.compiler=NONE or ""
2335 // causes us to switch to -Xint mode UNLESS -Xdebug
2336 // is also specified.
2337 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2338 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2339 }
2340 }
2341
2342 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2343 _sun_java_launcher = os::strdup_check_oom(launcher);
2344 }
2345
2346 bool Arguments::created_by_java_launcher() {
2347 assert(_sun_java_launcher != NULL, "property must have value");
2348 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2349 }
2350
2351 bool Arguments::sun_java_launcher_is_altjvm() {
2352 return _sun_java_launcher_is_altjvm;
2353 }
2354
2355 //===========================================================================================================
2356 // Parsing of main arguments
2357
2358 #if INCLUDE_JVMCI
2359 // Check consistency of jvmci vm argument settings.
2360 bool Arguments::check_jvmci_args_consistency() {
2361 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2362 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2363 return false;
2364 }
2365 return true;
2366 }
2367 #endif //INCLUDE_JVMCI
2368
2369 // Check consistency of GC selection
2370 bool Arguments::check_gc_consistency() {
2371 // Ensure that the user has not selected conflicting sets
2372 // of collectors.
2373 uint i = 0;
2374 if (UseSerialGC) i++;
2375 if (UseConcMarkSweepGC) i++;
2376 if (UseParallelGC || UseParallelOldGC) i++;
2377 if (UseG1GC) i++;
2378 if (i > 1) {
2379 jio_fprintf(defaultStream::error_stream(),
2380 "Conflicting collector combinations in option list; "
2381 "please refer to the release notes for the combinations "
2382 "allowed\n");
2383 return false;
2384 }
2385
2386 if (UseConcMarkSweepGC && !UseParNewGC) {
2387 jio_fprintf(defaultStream::error_stream(),
2388 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2389 return false;
2390 }
2391
2392 if (UseParNewGC && !UseConcMarkSweepGC) {
2393 jio_fprintf(defaultStream::error_stream(),
2394 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2395 return false;
2396 }
2397
2398 return true;
2399 }
2400
2401 // Check the consistency of vm_init_args
2402 bool Arguments::check_vm_args_consistency() {
2403 // Method for adding checks for flag consistency.
2404 // The intent is to warn the user of all possible conflicts,
2405 // before returning an error.
2406 // Note: Needs platform-dependent factoring.
2407 bool status = true;
2408
2409 if (TLABRefillWasteFraction == 0) {
2410 jio_fprintf(defaultStream::error_stream(),
2411 "TLABRefillWasteFraction should be a denominator, "
2412 "not " SIZE_FORMAT "\n",
2413 TLABRefillWasteFraction);
2414 status = false;
2415 }
2416
2417 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2418 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2419 }
2420
2421 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2422 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2423 }
2424
2425 if (GCTimeLimit == 100) {
2426 // Turn off gc-overhead-limit-exceeded checks
2427 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2428 }
2429
2430 status = status && check_gc_consistency();
2431
2432 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2433 // insists that we hold the requisite locks so that the iteration is
2434 // MT-safe. For the verification at start-up and shut-down, we don't
2435 // yet have a good way of acquiring and releasing these locks,
2436 // which are not visible at the CollectedHeap level. We want to
2437 // be able to acquire these locks and then do the iteration rather
2438 // than just disable the lock verification. This will be fixed under
2439 // bug 4788986.
2440 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2441 if (VerifyDuringStartup) {
2442 warning("Heap verification at start-up disabled "
2443 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2444 VerifyDuringStartup = false; // Disable verification at start-up
2445 }
2446
2447 if (VerifyBeforeExit) {
2448 warning("Heap verification at shutdown disabled "
2449 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2450 VerifyBeforeExit = false; // Disable verification at shutdown
2451 }
2452 }
2453
2454 if (PrintNMTStatistics) {
2455 #if INCLUDE_NMT
2456 if (MemTracker::tracking_level() == NMT_off) {
2457 #endif // INCLUDE_NMT
2458 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2459 PrintNMTStatistics = false;
2460 #if INCLUDE_NMT
2461 }
2462 #endif
2463 }
2464 #if INCLUDE_JVMCI
2465
2466 status = status && check_jvmci_args_consistency();
2467
2468 if (EnableJVMCI) {
2469 if (!ScavengeRootsInCode) {
2470 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2471 ScavengeRootsInCode = 1;
2472 }
2473 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2474 TypeProfileLevel = 0;
2475 }
2476 if (UseJVMCICompiler) {
2477 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2478 TypeProfileWidth = 8;
2479 }
2480 }
2481 }
2482 #endif
2483
2484 // Check lower bounds of the code cache
2485 // Template Interpreter code is approximately 3X larger in debug builds.
2486 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2487 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2490 os::vm_page_size()/K);
2491 status = false;
2492 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2493 jio_fprintf(defaultStream::error_stream(),
2494 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2495 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2496 status = false;
2497 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2500 min_code_cache_size/K);
2501 status = false;
2502 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2503 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2504 jio_fprintf(defaultStream::error_stream(),
2505 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2506 CODE_CACHE_SIZE_LIMIT/M);
2507 status = false;
2508 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2511 min_code_cache_size/K);
2512 status = false;
2513 }
2514
2515 #ifdef _LP64
2516 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2517 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2518 }
2519 #endif
2520
2521 #ifndef SUPPORT_RESERVED_STACK_AREA
2522 if (StackReservedPages != 0) {
2523 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2524 warning("Reserved Stack Area not supported on this platform");
2525 }
2526 #endif
2527 return status;
2528 }
2529
2530 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2531 const char* option_type) {
2532 if (ignore) return false;
2533
2534 const char* spacer = " ";
2535 if (option_type == NULL) {
2536 option_type = ++spacer; // Set both to the empty string.
2537 }
2538
2539 if (os::obsolete_option(option)) {
2540 jio_fprintf(defaultStream::error_stream(),
2541 "Obsolete %s%soption: %s\n", option_type, spacer,
2542 option->optionString);
2543 return false;
2544 } else {
2545 jio_fprintf(defaultStream::error_stream(),
2546 "Unrecognized %s%soption: %s\n", option_type, spacer,
2547 option->optionString);
2548 return true;
2549 }
2550 }
2551
2552 static const char* user_assertion_options[] = {
2553 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2554 };
2555
2556 static const char* system_assertion_options[] = {
2557 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2558 };
2559
2560 bool Arguments::parse_uintx(const char* value,
2561 uintx* uintx_arg,
2562 uintx min_size) {
2563
2564 // Check the sign first since atomull() parses only unsigned values.
2565 bool value_is_positive = !(*value == '-');
2566
2567 if (value_is_positive) {
2568 julong n;
2569 bool good_return = atomull(value, &n);
2570 if (good_return) {
2571 bool above_minimum = n >= min_size;
2572 bool value_is_too_large = n > max_uintx;
2573
2574 if (above_minimum && !value_is_too_large) {
2575 *uintx_arg = n;
2576 return true;
2577 }
2578 }
2579 }
2580 return false;
2581 }
2582
2583 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2584 julong* long_arg,
2585 julong min_size) {
2586 if (!atomull(s, long_arg)) return arg_unreadable;
2587 return check_memory_size(*long_arg, min_size);
2588 }
2589
2590 // Parse JavaVMInitArgs structure
2591
2592 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2593 const JavaVMInitArgs *java_options_args,
2594 const JavaVMInitArgs *cmd_line_args) {
2595 // For components of the system classpath.
2596 SysClassPath scp(Arguments::get_sysclasspath());
2597 bool scp_assembly_required = false;
2598
2599 // Save default settings for some mode flags
2600 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2601 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2602 Arguments::_ClipInlining = ClipInlining;
2603 Arguments::_BackgroundCompilation = BackgroundCompilation;
2604 if (TieredCompilation) {
2605 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2606 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2607 }
2608
2609 // Setup flags for mixed which is the default
2610 set_mode_flags(_mixed);
2611
2612 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2613 // variable (if present).
2614 jint result = parse_each_vm_init_arg(
2615 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2616 if (result != JNI_OK) {
2617 return result;
2618 }
2619
2620 // Parse args structure generated from the command line flags.
2621 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2622 Flag::COMMAND_LINE);
2623 if (result != JNI_OK) {
2624 return result;
2625 }
2626
2627 // Parse args structure generated from the _JAVA_OPTIONS environment
2628 // variable (if present) (mimics classic VM)
2629 result = parse_each_vm_init_arg(
2630 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2631 if (result != JNI_OK) {
2632 return result;
2633 }
2634
2635 // Do final processing now that all arguments have been parsed
2636 result = finalize_vm_init_args(&scp, scp_assembly_required);
2637 if (result != JNI_OK) {
2638 return result;
2639 }
2640
2641 return JNI_OK;
2642 }
2643
2644 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2645 // represents a valid JDWP agent. is_path==true denotes that we
2646 // are dealing with -agentpath (case where name is a path), otherwise with
2647 // -agentlib
2648 bool valid_jdwp_agent(char *name, bool is_path) {
2649 char *_name;
2650 const char *_jdwp = "jdwp";
2651 size_t _len_jdwp, _len_prefix;
2652
2653 if (is_path) {
2654 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2655 return false;
2656 }
2657
2658 _name++; // skip past last path separator
2659 _len_prefix = strlen(JNI_LIB_PREFIX);
2660
2661 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2662 return false;
2663 }
2664
2665 _name += _len_prefix;
2666 _len_jdwp = strlen(_jdwp);
2667
2668 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2669 _name += _len_jdwp;
2670 }
2671 else {
2672 return false;
2673 }
2674
2675 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2676 return false;
2677 }
2678
2679 return true;
2680 }
2681
2682 if (strcmp(name, _jdwp) == 0) {
2683 return true;
2684 }
2685
2686 return false;
2687 }
2688
2689 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2690 SysClassPath* scp_p,
2691 bool* scp_assembly_required_p,
2692 Flag::Flags origin) {
2693 // For match_option to return remaining or value part of option string
2694 const char* tail;
2695
2696 // iterate over arguments
2697 for (int index = 0; index < args->nOptions; index++) {
2698 bool is_absolute_path = false; // for -agentpath vs -agentlib
2699
2700 const JavaVMOption* option = args->options + index;
2701
2702 if (!match_option(option, "-Djava.class.path", &tail) &&
2703 !match_option(option, "-Dsun.java.command", &tail) &&
2704 !match_option(option, "-Dsun.java.launcher", &tail)) {
2705
2706 // add all jvm options to the jvm_args string. This string
2707 // is used later to set the java.vm.args PerfData string constant.
2708 // the -Djava.class.path and the -Dsun.java.command options are
2709 // omitted from jvm_args string as each have their own PerfData
2710 // string constant object.
2711 build_jvm_args(option->optionString);
2712 }
2713
2714 // -verbose:[class/gc/jni]
2715 if (match_option(option, "-verbose", &tail)) {
2716 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2717 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload));
2718 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload));
2719 } else if (!strcmp(tail, ":gc")) {
2720 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2721 } else if (!strcmp(tail, ":jni")) {
2722 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725 }
2726 // -da / -ea / -disableassertions / -enableassertions
2727 // These accept an optional class/package name separated by a colon, e.g.,
2728 // -da:java.lang.Thread.
2729 } else if (match_option(option, user_assertion_options, &tail, true)) {
2730 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2731 if (*tail == '\0') {
2732 JavaAssertions::setUserClassDefault(enable);
2733 } else {
2734 assert(*tail == ':', "bogus match by match_option()");
2735 JavaAssertions::addOption(tail + 1, enable);
2736 }
2737 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2738 } else if (match_option(option, system_assertion_options, &tail, false)) {
2739 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2740 JavaAssertions::setSystemClassDefault(enable);
2741 // -bootclasspath:
2742 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2743 scp_p->reset_path(tail);
2744 *scp_assembly_required_p = true;
2745 // -bootclasspath/a:
2746 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2747 scp_p->add_suffix(tail);
2748 *scp_assembly_required_p = true;
2749 // -bootclasspath/p:
2750 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2751 scp_p->add_prefix(tail);
2752 *scp_assembly_required_p = true;
2753 // -Xrun
2754 } else if (match_option(option, "-Xrun", &tail)) {
2755 if (tail != NULL) {
2756 const char* pos = strchr(tail, ':');
2757 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2758 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2759 name[len] = '\0';
2760
2761 char *options = NULL;
2762 if(pos != NULL) {
2763 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2764 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2765 }
2766 #if !INCLUDE_JVMTI
2767 if (strcmp(name, "jdwp") == 0) {
2768 jio_fprintf(defaultStream::error_stream(),
2769 "Debugging agents are not supported in this VM\n");
2770 return JNI_ERR;
2771 }
2772 #endif // !INCLUDE_JVMTI
2773 add_init_library(name, options);
2774 }
2775 // -agentlib and -agentpath
2776 } else if (match_option(option, "-agentlib:", &tail) ||
2777 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2778 if(tail != NULL) {
2779 const char* pos = strchr(tail, '=');
2780 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2781 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2782 name[len] = '\0';
2783
2784 char *options = NULL;
2785 if(pos != NULL) {
2786 options = os::strdup_check_oom(pos + 1, mtInternal);
2787 }
2788 #if !INCLUDE_JVMTI
2789 if (valid_jdwp_agent(name, is_absolute_path)) {
2790 jio_fprintf(defaultStream::error_stream(),
2791 "Debugging agents are not supported in this VM\n");
2792 return JNI_ERR;
2793 }
2794 #endif // !INCLUDE_JVMTI
2795 add_init_agent(name, options, is_absolute_path);
2796 }
2797 // -javaagent
2798 } else if (match_option(option, "-javaagent:", &tail)) {
2799 #if !INCLUDE_JVMTI
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Instrumentation agents are not supported in this VM\n");
2802 return JNI_ERR;
2803 #else
2804 if(tail != NULL) {
2805 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2806 add_init_agent("instrument", options, false);
2807 }
2808 #endif // !INCLUDE_JVMTI
2809 // -Xnoclassgc
2810 } else if (match_option(option, "-Xnoclassgc")) {
2811 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2812 return JNI_EINVAL;
2813 }
2814 // -Xconcgc
2815 } else if (match_option(option, "-Xconcgc")) {
2816 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2817 return JNI_EINVAL;
2818 }
2819 // -Xnoconcgc
2820 } else if (match_option(option, "-Xnoconcgc")) {
2821 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2822 return JNI_EINVAL;
2823 }
2824 // -Xbatch
2825 } else if (match_option(option, "-Xbatch")) {
2826 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2827 return JNI_EINVAL;
2828 }
2829 // -Xmn for compatibility with other JVM vendors
2830 } else if (match_option(option, "-Xmn", &tail)) {
2831 julong long_initial_young_size = 0;
2832 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2833 if (errcode != arg_in_range) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Invalid initial young generation size: %s\n", option->optionString);
2836 describe_range_error(errcode);
2837 return JNI_EINVAL;
2838 }
2839 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2840 return JNI_EINVAL;
2841 }
2842 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2843 return JNI_EINVAL;
2844 }
2845 // -Xms
2846 } else if (match_option(option, "-Xms", &tail)) {
2847 julong long_initial_heap_size = 0;
2848 // an initial heap size of 0 means automatically determine
2849 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2850 if (errcode != arg_in_range) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid initial heap size: %s\n", option->optionString);
2853 describe_range_error(errcode);
2854 return JNI_EINVAL;
2855 }
2856 set_min_heap_size((size_t)long_initial_heap_size);
2857 // Currently the minimum size and the initial heap sizes are the same.
2858 // Can be overridden with -XX:InitialHeapSize.
2859 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2860 return JNI_EINVAL;
2861 }
2862 // -Xmx
2863 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2864 julong long_max_heap_size = 0;
2865 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2866 if (errcode != arg_in_range) {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Invalid maximum heap size: %s\n", option->optionString);
2869 describe_range_error(errcode);
2870 return JNI_EINVAL;
2871 }
2872 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2873 return JNI_EINVAL;
2874 }
2875 // Xmaxf
2876 } else if (match_option(option, "-Xmaxf", &tail)) {
2877 char* err;
2878 int maxf = (int)(strtod(tail, &err) * 100);
2879 if (*err != '\0' || *tail == '\0') {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Bad max heap free percentage size: %s\n",
2882 option->optionString);
2883 return JNI_EINVAL;
2884 } else {
2885 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 }
2889 // Xminf
2890 } else if (match_option(option, "-Xminf", &tail)) {
2891 char* err;
2892 int minf = (int)(strtod(tail, &err) * 100);
2893 if (*err != '\0' || *tail == '\0') {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Bad min heap free percentage size: %s\n",
2896 option->optionString);
2897 return JNI_EINVAL;
2898 } else {
2899 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 }
2903 // -Xss
2904 } else if (match_option(option, "-Xss", &tail)) {
2905 julong long_ThreadStackSize = 0;
2906 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2907 if (errcode != arg_in_range) {
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Invalid thread stack size: %s\n", option->optionString);
2910 describe_range_error(errcode);
2911 return JNI_EINVAL;
2912 }
2913 // Internally track ThreadStackSize in units of 1024 bytes.
2914 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2915 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2916 return JNI_EINVAL;
2917 }
2918 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2919 } else if (match_option(option, "-Xoss", &tail) ||
2920 match_option(option, "-Xsqnopause") ||
2921 match_option(option, "-Xoptimize") ||
2922 match_option(option, "-Xboundthreads") ||
2923 match_option(option, "-Xusealtsigs")) {
2924 // All these options are deprecated in JDK 9 and will be removed in a future release
2925 char version[256];
2926 JDK_Version::jdk(9).to_string(version, sizeof(version));
2927 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2928 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2929 julong long_CodeCacheExpansionSize = 0;
2930 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2931 if (errcode != arg_in_range) {
2932 jio_fprintf(defaultStream::error_stream(),
2933 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2934 os::vm_page_size()/K);
2935 return JNI_EINVAL;
2936 }
2937 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2938 return JNI_EINVAL;
2939 }
2940 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2941 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2942 julong long_ReservedCodeCacheSize = 0;
2943
2944 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2945 if (errcode != arg_in_range) {
2946 jio_fprintf(defaultStream::error_stream(),
2947 "Invalid maximum code cache size: %s.\n", option->optionString);
2948 return JNI_EINVAL;
2949 }
2950 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 // -XX:NonNMethodCodeHeapSize=
2954 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2955 julong long_NonNMethodCodeHeapSize = 0;
2956
2957 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2958 if (errcode != arg_in_range) {
2959 jio_fprintf(defaultStream::error_stream(),
2960 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2961 return JNI_EINVAL;
2962 }
2963 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 // -XX:ProfiledCodeHeapSize=
2967 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2968 julong long_ProfiledCodeHeapSize = 0;
2969
2970 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2971 if (errcode != arg_in_range) {
2972 jio_fprintf(defaultStream::error_stream(),
2973 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2974 return JNI_EINVAL;
2975 }
2976 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2977 return JNI_EINVAL;
2978 }
2979 // -XX:NonProfiledCodeHeapSizee=
2980 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2981 julong long_NonProfiledCodeHeapSize = 0;
2982
2983 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2984 if (errcode != arg_in_range) {
2985 jio_fprintf(defaultStream::error_stream(),
2986 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2987 return JNI_EINVAL;
2988 }
2989 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992 // -green
2993 } else if (match_option(option, "-green")) {
2994 jio_fprintf(defaultStream::error_stream(),
2995 "Green threads support not available\n");
2996 return JNI_EINVAL;
2997 // -native
2998 } else if (match_option(option, "-native")) {
2999 // HotSpot always uses native threads, ignore silently for compatibility
3000 // -Xrs
3001 } else if (match_option(option, "-Xrs")) {
3002 // Classic/EVM option, new functionality
3003 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 // -Xprof
3007 } else if (match_option(option, "-Xprof")) {
3008 #if INCLUDE_FPROF
3009 _has_profile = true;
3010 #else // INCLUDE_FPROF
3011 jio_fprintf(defaultStream::error_stream(),
3012 "Flat profiling is not supported in this VM.\n");
3013 return JNI_ERR;
3014 #endif // INCLUDE_FPROF
3015 // -Xconcurrentio
3016 } else if (match_option(option, "-Xconcurrentio")) {
3017 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3018 return JNI_EINVAL;
3019 }
3020 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3021 return JNI_EINVAL;
3022 }
3023 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3024 return JNI_EINVAL;
3025 }
3026 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3027 return JNI_EINVAL;
3028 }
3029 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3030 return JNI_EINVAL;
3031 }
3032
3033 // -Xinternalversion
3034 } else if (match_option(option, "-Xinternalversion")) {
3035 jio_fprintf(defaultStream::output_stream(), "%s\n",
3036 VM_Version::internal_vm_info_string());
3037 vm_exit(0);
3038 #ifndef PRODUCT
3039 // -Xprintflags
3040 } else if (match_option(option, "-Xprintflags")) {
3041 CommandLineFlags::printFlags(tty, false);
3042 vm_exit(0);
3043 #endif
3044 // -D
3045 } else if (match_option(option, "-D", &tail)) {
3046 const char* value;
3047 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3048 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3049 // abort if -Djava.endorsed.dirs is set
3050 jio_fprintf(defaultStream::output_stream(),
3051 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3052 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3053 return JNI_EINVAL;
3054 }
3055 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3056 *value != '\0' && strcmp(value, "\"\"") != 0) {
3057 // abort if -Djava.ext.dirs is set
3058 jio_fprintf(defaultStream::output_stream(),
3059 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3060 return JNI_EINVAL;
3061 }
3062
3063 if (!add_property(tail)) {
3064 return JNI_ENOMEM;
3065 }
3066 // Out of the box management support
3067 if (match_option(option, "-Dcom.sun.management", &tail)) {
3068 #if INCLUDE_MANAGEMENT
3069 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3070 return JNI_EINVAL;
3071 }
3072 #else
3073 jio_fprintf(defaultStream::output_stream(),
3074 "-Dcom.sun.management is not supported in this VM.\n");
3075 return JNI_ERR;
3076 #endif
3077 }
3078 // -Xint
3079 } else if (match_option(option, "-Xint")) {
3080 set_mode_flags(_int);
3081 // -Xmixed
3082 } else if (match_option(option, "-Xmixed")) {
3083 set_mode_flags(_mixed);
3084 // -Xcomp
3085 } else if (match_option(option, "-Xcomp")) {
3086 // for testing the compiler; turn off all flags that inhibit compilation
3087 set_mode_flags(_comp);
3088 // -Xshare:dump
3089 } else if (match_option(option, "-Xshare:dump")) {
3090 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3091 return JNI_EINVAL;
3092 }
3093 set_mode_flags(_int); // Prevent compilation, which creates objects
3094 // -Xshare:on
3095 } else if (match_option(option, "-Xshare:on")) {
3096 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3097 return JNI_EINVAL;
3098 }
3099 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3100 return JNI_EINVAL;
3101 }
3102 // -Xshare:auto
3103 } else if (match_option(option, "-Xshare:auto")) {
3104 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3105 return JNI_EINVAL;
3106 }
3107 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3108 return JNI_EINVAL;
3109 }
3110 // -Xshare:off
3111 } else if (match_option(option, "-Xshare:off")) {
3112 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3113 return JNI_EINVAL;
3114 }
3115 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3116 return JNI_EINVAL;
3117 }
3118 // -Xverify
3119 } else if (match_option(option, "-Xverify", &tail)) {
3120 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3121 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3125 return JNI_EINVAL;
3126 }
3127 } else if (strcmp(tail, ":remote") == 0) {
3128 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3129 return JNI_EINVAL;
3130 }
3131 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3132 return JNI_EINVAL;
3133 }
3134 } else if (strcmp(tail, ":none") == 0) {
3135 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3139 return JNI_EINVAL;
3140 }
3141 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3142 return JNI_EINVAL;
3143 }
3144 // -Xdebug
3145 } else if (match_option(option, "-Xdebug")) {
3146 // note this flag has been used, then ignore
3147 set_xdebug_mode(true);
3148 // -Xnoagent
3149 } else if (match_option(option, "-Xnoagent")) {
3150 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3151 } else if (match_option(option, "-Xloggc:", &tail)) {
3152 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3153 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3154 _gc_log_filename = os::strdup_check_oom(tail);
3155 } else if (match_option(option, "-Xlog", &tail)) {
3156 bool ret = false;
3157 if (strcmp(tail, ":help") == 0) {
3158 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3159 vm_exit(0);
3160 } else if (strcmp(tail, ":disable") == 0) {
3161 LogConfiguration::disable_logging();
3162 ret = true;
3163 } else if (*tail == '\0') {
3164 ret = LogConfiguration::parse_command_line_arguments();
3165 assert(ret, "-Xlog without arguments should never fail to parse");
3166 } else if (*tail == ':') {
3167 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3168 }
3169 if (ret == false) {
3170 jio_fprintf(defaultStream::error_stream(),
3171 "Invalid -Xlog option '-Xlog%s'\n",
3172 tail);
3173 return JNI_EINVAL;
3174 }
3175 // JNI hooks
3176 } else if (match_option(option, "-Xcheck", &tail)) {
3177 if (!strcmp(tail, ":jni")) {
3178 #if !INCLUDE_JNI_CHECK
3179 warning("JNI CHECKING is not supported in this VM");
3180 #else
3181 CheckJNICalls = true;
3182 #endif // INCLUDE_JNI_CHECK
3183 } else if (is_bad_option(option, args->ignoreUnrecognized,
3184 "check")) {
3185 return JNI_EINVAL;
3186 }
3187 } else if (match_option(option, "vfprintf")) {
3188 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3189 } else if (match_option(option, "exit")) {
3190 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3191 } else if (match_option(option, "abort")) {
3192 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3193 // -XX:+AggressiveHeap
3194 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3195 jint result = set_aggressive_heap_flags();
3196 if (result != JNI_OK) {
3197 return result;
3198 }
3199 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3200 // and the last option wins.
3201 } else if (match_option(option, "-XX:+NeverTenure")) {
3202 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3203 return JNI_EINVAL;
3204 }
3205 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3206 return JNI_EINVAL;
3207 }
3208 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3212 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3213 return JNI_EINVAL;
3214 }
3215 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3216 return JNI_EINVAL;
3217 }
3218 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3219 return JNI_EINVAL;
3220 }
3221 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3222 uintx max_tenuring_thresh = 0;
3223 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3224 jio_fprintf(defaultStream::error_stream(),
3225 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3226 return JNI_EINVAL;
3227 }
3228
3229 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3230 return JNI_EINVAL;
3231 }
3232
3233 if (MaxTenuringThreshold == 0) {
3234 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3235 return JNI_EINVAL;
3236 }
3237 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3238 return JNI_EINVAL;
3239 }
3240 } else {
3241 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3242 return JNI_EINVAL;
3243 }
3244 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3245 return JNI_EINVAL;
3246 }
3247 }
3248 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3249 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3250 return JNI_EINVAL;
3251 }
3252 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3253 return JNI_EINVAL;
3254 }
3255 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3256 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3257 return JNI_EINVAL;
3258 }
3259 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3260 return JNI_EINVAL;
3261 }
3262 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3263 #if defined(DTRACE_ENABLED)
3264 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3265 return JNI_EINVAL;
3266 }
3267 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3268 return JNI_EINVAL;
3269 }
3270 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3271 return JNI_EINVAL;
3272 }
3273 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3274 return JNI_EINVAL;
3275 }
3276 #else // defined(DTRACE_ENABLED)
3277 jio_fprintf(defaultStream::error_stream(),
3278 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3279 return JNI_EINVAL;
3280 #endif // defined(DTRACE_ENABLED)
3281 #ifdef ASSERT
3282 } else if (match_option(option, "-XX:+FullGCALot")) {
3283 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3284 return JNI_EINVAL;
3285 }
3286 // disable scavenge before parallel mark-compact
3287 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3288 return JNI_EINVAL;
3289 }
3290 #endif
3291 #if !INCLUDE_MANAGEMENT
3292 } else if (match_option(option, "-XX:+ManagementServer")) {
3293 jio_fprintf(defaultStream::error_stream(),
3294 "ManagementServer is not supported in this VM.\n");
3295 return JNI_ERR;
3296 #endif // INCLUDE_MANAGEMENT
3297 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3298 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3299 // already been handled
3300 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3301 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3302 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3303 return JNI_EINVAL;
3304 }
3305 }
3306 // Unknown option
3307 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3308 return JNI_ERR;
3309 }
3310 }
3311
3312 // PrintSharedArchiveAndExit will turn on
3313 // -Xshare:on
3314 // -Xlog:classpath=info
3315 if (PrintSharedArchiveAndExit) {
3316 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3317 return JNI_EINVAL;
3318 }
3319 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3320 return JNI_EINVAL;
3321 }
3322 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classpath));
3323 }
3324
3325 // Change the default value for flags which have different default values
3326 // when working with older JDKs.
3327 #ifdef LINUX
3328 if (JDK_Version::current().compare_major(6) <= 0 &&
3329 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3330 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3331 }
3332 #endif // LINUX
3333 fix_appclasspath();
3334 return JNI_OK;
3335 }
3336
3337 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3338 //
3339 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3340 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3341 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3342 // path is treated as the current directory.
3343 //
3344 // This causes problems with CDS, which requires that all directories specified in the classpath
3345 // must be empty. In most cases, applications do NOT want to load classes from the current
3346 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3347 // scripts compatible with CDS.
3348 void Arguments::fix_appclasspath() {
3349 if (IgnoreEmptyClassPaths) {
3350 const char separator = *os::path_separator();
3351 const char* src = _java_class_path->value();
3352
3353 // skip over all the leading empty paths
3354 while (*src == separator) {
3355 src ++;
3356 }
3357
3358 char* copy = os::strdup_check_oom(src, mtInternal);
3359
3360 // trim all trailing empty paths
3361 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3362 *tail = '\0';
3363 }
3364
3365 char from[3] = {separator, separator, '\0'};
3366 char to [2] = {separator, '\0'};
3367 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3368 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3369 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3370 }
3371
3372 _java_class_path->set_value(copy);
3373 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3374 }
3375 }
3376
3377 static bool has_jar_files(const char* directory) {
3378 DIR* dir = os::opendir(directory);
3379 if (dir == NULL) return false;
3380
3381 struct dirent *entry;
3382 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3383 bool hasJarFile = false;
3384 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3385 const char* name = entry->d_name;
3386 const char* ext = name + strlen(name) - 4;
3387 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3388 }
3389 FREE_C_HEAP_ARRAY(char, dbuf);
3390 os::closedir(dir);
3391 return hasJarFile ;
3392 }
3393
3394 static int check_non_empty_dirs(const char* path) {
3395 const char separator = *os::path_separator();
3396 const char* const end = path + strlen(path);
3397 int nonEmptyDirs = 0;
3398 while (path < end) {
3399 const char* tmp_end = strchr(path, separator);
3400 if (tmp_end == NULL) {
3401 if (has_jar_files(path)) {
3402 nonEmptyDirs++;
3403 jio_fprintf(defaultStream::output_stream(),
3404 "Non-empty directory: %s\n", path);
3405 }
3406 path = end;
3407 } else {
3408 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3409 memcpy(dirpath, path, tmp_end - path);
3410 dirpath[tmp_end - path] = '\0';
3411 if (has_jar_files(dirpath)) {
3412 nonEmptyDirs++;
3413 jio_fprintf(defaultStream::output_stream(),
3414 "Non-empty directory: %s\n", dirpath);
3415 }
3416 FREE_C_HEAP_ARRAY(char, dirpath);
3417 path = tmp_end + 1;
3418 }
3419 }
3420 return nonEmptyDirs;
3421 }
3422
3423 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3424 // check if the default lib/endorsed directory exists; if so, error
3425 char path[JVM_MAXPATHLEN];
3426 const char* fileSep = os::file_separator();
3427 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3428
3429 if (CheckEndorsedAndExtDirs) {
3430 int nonEmptyDirs = 0;
3431 // check endorsed directory
3432 nonEmptyDirs += check_non_empty_dirs(path);
3433 // check the extension directories
3434 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3435 if (nonEmptyDirs > 0) {
3436 return JNI_ERR;
3437 }
3438 }
3439
3440 DIR* dir = os::opendir(path);
3441 if (dir != NULL) {
3442 jio_fprintf(defaultStream::output_stream(),
3443 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3444 "in modular form will be supported via the concept of upgradeable modules.\n");
3445 os::closedir(dir);
3446 return JNI_ERR;
3447 }
3448
3449 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3450 dir = os::opendir(path);
3451 if (dir != NULL) {
3452 jio_fprintf(defaultStream::output_stream(),
3453 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3454 "Use -classpath instead.\n.");
3455 os::closedir(dir);
3456 return JNI_ERR;
3457 }
3458
3459 if (scp_assembly_required) {
3460 // Assemble the bootclasspath elements into the final path.
3461 char *combined_path = scp_p->combined_path();
3462 Arguments::set_sysclasspath(combined_path);
3463 FREE_C_HEAP_ARRAY(char, combined_path);
3464 }
3465
3466 // This must be done after all arguments have been processed.
3467 // java_compiler() true means set to "NONE" or empty.
3468 if (java_compiler() && !xdebug_mode()) {
3469 // For backwards compatibility, we switch to interpreted mode if
3470 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3471 // not specified.
3472 set_mode_flags(_int);
3473 }
3474
3475 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3476 // but like -Xint, leave compilation thresholds unaffected.
3477 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3478 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3479 set_mode_flags(_int);
3480 }
3481
3482 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3483 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3484 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3485 }
3486
3487 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3488 // Don't degrade server performance for footprint
3489 if (FLAG_IS_DEFAULT(UseLargePages) &&
3490 MaxHeapSize < LargePageHeapSizeThreshold) {
3491 // No need for large granularity pages w/small heaps.
3492 // Note that large pages are enabled/disabled for both the
3493 // Java heap and the code cache.
3494 FLAG_SET_DEFAULT(UseLargePages, false);
3495 }
3496
3497 #elif defined(COMPILER2)
3498 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3499 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3500 }
3501 #endif
3502
3503 #ifndef TIERED
3504 // Tiered compilation is undefined.
3505 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3506 #endif
3507
3508 // If we are running in a headless jre, force java.awt.headless property
3509 // to be true unless the property has already been set.
3510 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3511 if (os::is_headless_jre()) {
3512 const char* headless = Arguments::get_property("java.awt.headless");
3513 if (headless == NULL) {
3514 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3515 if (headless_env == NULL) {
3516 if (!add_property("java.awt.headless=true")) {
3517 return JNI_ENOMEM;
3518 }
3519 } else {
3520 char buffer[256];
3521 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3522 if (!add_property(buffer)) {
3523 return JNI_ENOMEM;
3524 }
3525 }
3526 }
3527 }
3528
3529 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3530 // CMS can only be used with ParNew
3531 FLAG_SET_ERGO(bool, UseParNewGC, true);
3532 }
3533
3534 if (!check_vm_args_consistency()) {
3535 return JNI_ERR;
3536 }
3537
3538 return JNI_OK;
3539 }
3540
3541 // Helper class for controlling the lifetime of JavaVMInitArgs
3542 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3543 // deleted on the destruction of the ScopedVMInitArgs object.
3544 class ScopedVMInitArgs : public StackObj {
3545 private:
3546 JavaVMInitArgs _args;
3547 char* _container_name;
3548 bool _is_set;
3549 char* _vm_options_file_arg;
3550
3551 public:
3552 ScopedVMInitArgs(const char *container_name) {
3553 _args.version = JNI_VERSION_1_2;
3554 _args.nOptions = 0;
3555 _args.options = NULL;
3556 _args.ignoreUnrecognized = false;
3557 _container_name = (char *)container_name;
3558 _is_set = false;
3559 _vm_options_file_arg = NULL;
3560 }
3561
3562 // Populates the JavaVMInitArgs object represented by this
3563 // ScopedVMInitArgs object with the arguments in options. The
3564 // allocated memory is deleted by the destructor. If this method
3565 // returns anything other than JNI_OK, then this object is in a
3566 // partially constructed state, and should be abandoned.
3567 jint set_args(GrowableArray<JavaVMOption>* options) {
3568 _is_set = true;
3569 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3570 JavaVMOption, options->length(), mtInternal);
3571 if (options_arr == NULL) {
3572 return JNI_ENOMEM;
3573 }
3574 _args.options = options_arr;
3575
3576 for (int i = 0; i < options->length(); i++) {
3577 options_arr[i] = options->at(i);
3578 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3579 if (options_arr[i].optionString == NULL) {
3580 // Rely on the destructor to do cleanup.
3581 _args.nOptions = i;
3582 return JNI_ENOMEM;
3583 }
3584 }
3585
3586 _args.nOptions = options->length();
3587 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3588 return JNI_OK;
3589 }
3590
3591 JavaVMInitArgs* get() { return &_args; }
3592 char* container_name() { return _container_name; }
3593 bool is_set() { return _is_set; }
3594 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3595 char* vm_options_file_arg() { return _vm_options_file_arg; }
3596
3597 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3598 if (_vm_options_file_arg != NULL) {
3599 os::free(_vm_options_file_arg);
3600 }
3601 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3602 }
3603
3604 ~ScopedVMInitArgs() {
3605 if (_vm_options_file_arg != NULL) {
3606 os::free(_vm_options_file_arg);
3607 }
3608 if (_args.options == NULL) return;
3609 for (int i = 0; i < _args.nOptions; i++) {
3610 os::free(_args.options[i].optionString);
3611 }
3612 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3613 }
3614
3615 // Insert options into this option list, to replace option at
3616 // vm_options_file_pos (-XX:VMOptionsFile)
3617 jint insert(const JavaVMInitArgs* args,
3618 const JavaVMInitArgs* args_to_insert,
3619 const int vm_options_file_pos) {
3620 assert(_args.options == NULL, "shouldn't be set yet");
3621 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3622 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3623
3624 int length = args->nOptions + args_to_insert->nOptions - 1;
3625 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3626 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3627 for (int i = 0; i < args->nOptions; i++) {
3628 if (i == vm_options_file_pos) {
3629 // insert the new options starting at the same place as the
3630 // -XX:VMOptionsFile option
3631 for (int j = 0; j < args_to_insert->nOptions; j++) {
3632 options->push(args_to_insert->options[j]);
3633 }
3634 } else {
3635 options->push(args->options[i]);
3636 }
3637 }
3638 // make into options array
3639 jint result = set_args(options);
3640 delete options;
3641 return result;
3642 }
3643 };
3644
3645 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3646 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3647 }
3648
3649 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3650 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3651 }
3652
3653 jint Arguments::parse_options_environment_variable(const char* name,
3654 ScopedVMInitArgs* vm_args) {
3655 char *buffer = ::getenv(name);
3656
3657 // Don't check this environment variable if user has special privileges
3658 // (e.g. unix su command).
3659 if (buffer == NULL || os::have_special_privileges()) {
3660 return JNI_OK;
3661 }
3662
3663 if ((buffer = os::strdup(buffer)) == NULL) {
3664 return JNI_ENOMEM;
3665 }
3666
3667 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3668
3669 os::free(buffer);
3670 return retcode;
3671 }
3672
3673 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3674 // read file into buffer
3675 int fd = ::open(file_name, O_RDONLY);
3676 if (fd < 0) {
3677 jio_fprintf(defaultStream::error_stream(),
3678 "Could not open options file '%s'\n",
3679 file_name);
3680 return JNI_ERR;
3681 }
3682
3683 struct stat stbuf;
3684 int retcode = os::stat(file_name, &stbuf);
3685 if (retcode != 0) {
3686 jio_fprintf(defaultStream::error_stream(),
3687 "Could not stat options file '%s'\n",
3688 file_name);
3689 os::close(fd);
3690 return JNI_ERR;
3691 }
3692
3693 if (stbuf.st_size == 0) {
3694 // tell caller there is no option data and that is ok
3695 os::close(fd);
3696 return JNI_OK;
3697 }
3698
3699 // '+ 1' for NULL termination even with max bytes
3700 size_t bytes_alloc = stbuf.st_size + 1;
3701
3702 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3703 if (NULL == buf) {
3704 jio_fprintf(defaultStream::error_stream(),
3705 "Could not allocate read buffer for options file parse\n");
3706 os::close(fd);
3707 return JNI_ENOMEM;
3708 }
3709
3710 memset(buf, 0, bytes_alloc);
3711
3712 // Fill buffer
3713 // Use ::read() instead of os::read because os::read()
3714 // might do a thread state transition
3715 // and it is too early for that here
3716
3717 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3718 os::close(fd);
3719 if (bytes_read < 0) {
3720 FREE_C_HEAP_ARRAY(char, buf);
3721 jio_fprintf(defaultStream::error_stream(),
3722 "Could not read options file '%s'\n", file_name);
3723 return JNI_ERR;
3724 }
3725
3726 if (bytes_read == 0) {
3727 // tell caller there is no option data and that is ok
3728 FREE_C_HEAP_ARRAY(char, buf);
3729 return JNI_OK;
3730 }
3731
3732 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3733
3734 FREE_C_HEAP_ARRAY(char, buf);
3735 return retcode;
3736 }
3737
3738 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3739 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3740
3741 // some pointers to help with parsing
3742 char *buffer_end = buffer + buf_len;
3743 char *opt_hd = buffer;
3744 char *wrt = buffer;
3745 char *rd = buffer;
3746
3747 // parse all options
3748 while (rd < buffer_end) {
3749 // skip leading white space from the input string
3750 while (rd < buffer_end && isspace(*rd)) {
3751 rd++;
3752 }
3753
3754 if (rd >= buffer_end) {
3755 break;
3756 }
3757
3758 // Remember this is where we found the head of the token.
3759 opt_hd = wrt;
3760
3761 // Tokens are strings of non white space characters separated
3762 // by one or more white spaces.
3763 while (rd < buffer_end && !isspace(*rd)) {
3764 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3765 int quote = *rd; // matching quote to look for
3766 rd++; // don't copy open quote
3767 while (rd < buffer_end && *rd != quote) {
3768 // include everything (even spaces)
3769 // up until the close quote
3770 *wrt++ = *rd++; // copy to option string
3771 }
3772
3773 if (rd < buffer_end) {
3774 rd++; // don't copy close quote
3775 } else {
3776 // did not see closing quote
3777 jio_fprintf(defaultStream::error_stream(),
3778 "Unmatched quote in %s\n", name);
3779 delete options;
3780 return JNI_ERR;
3781 }
3782 } else {
3783 *wrt++ = *rd++; // copy to option string
3784 }
3785 }
3786
3787 // steal a white space character and set it to NULL
3788 *wrt++ = '\0';
3789 // We now have a complete token
3790
3791 JavaVMOption option;
3792 option.optionString = opt_hd;
3793 option.extraInfo = NULL;
3794
3795 options->append(option); // Fill in option
3796
3797 rd++; // Advance to next character
3798 }
3799
3800 // Fill out JavaVMInitArgs structure.
3801 jint status = vm_args->set_args(options);
3802
3803 delete options;
3804 return status;
3805 }
3806
3807 void Arguments::set_shared_spaces_flags() {
3808 if (DumpSharedSpaces) {
3809 if (RequireSharedSpaces) {
3810 warning("Cannot dump shared archive while using shared archive");
3811 }
3812 UseSharedSpaces = false;
3813 #ifdef _LP64
3814 if (!UseCompressedOops || !UseCompressedClassPointers) {
3815 vm_exit_during_initialization(
3816 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3817 }
3818 } else {
3819 if (!UseCompressedOops || !UseCompressedClassPointers) {
3820 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3821 }
3822 #endif
3823 }
3824 }
3825
3826 #if !INCLUDE_ALL_GCS
3827 static void force_serial_gc() {
3828 FLAG_SET_DEFAULT(UseSerialGC, true);
3829 UNSUPPORTED_GC_OPTION(UseG1GC);
3830 UNSUPPORTED_GC_OPTION(UseParallelGC);
3831 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3832 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3833 UNSUPPORTED_GC_OPTION(UseParNewGC);
3834 }
3835 #endif // INCLUDE_ALL_GCS
3836
3837 // Sharing support
3838 // Construct the path to the archive
3839 static char* get_shared_archive_path() {
3840 char *shared_archive_path;
3841 if (SharedArchiveFile == NULL) {
3842 char jvm_path[JVM_MAXPATHLEN];
3843 os::jvm_path(jvm_path, sizeof(jvm_path));
3844 char *end = strrchr(jvm_path, *os::file_separator());
3845 if (end != NULL) *end = '\0';
3846 size_t jvm_path_len = strlen(jvm_path);
3847 size_t file_sep_len = strlen(os::file_separator());
3848 const size_t len = jvm_path_len + file_sep_len + 20;
3849 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3850 if (shared_archive_path != NULL) {
3851 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3852 jvm_path, os::file_separator());
3853 }
3854 } else {
3855 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3856 }
3857 return shared_archive_path;
3858 }
3859
3860 #ifndef PRODUCT
3861 // Determine whether LogVMOutput should be implicitly turned on.
3862 static bool use_vm_log() {
3863 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3864 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3865 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3866 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3867 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3868 return true;
3869 }
3870
3871 #ifdef COMPILER1
3872 if (PrintC1Statistics) {
3873 return true;
3874 }
3875 #endif // COMPILER1
3876
3877 #ifdef COMPILER2
3878 if (PrintOptoAssembly || PrintOptoStatistics) {
3879 return true;
3880 }
3881 #endif // COMPILER2
3882
3883 return false;
3884 }
3885
3886 #endif // PRODUCT
3887
3888 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3889 for (int index = 0; index < args->nOptions; index++) {
3890 const JavaVMOption* option = args->options + index;
3891 const char* tail;
3892 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3893 return true;
3894 }
3895 }
3896 return false;
3897 }
3898
3899 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3900 const char* vm_options_file,
3901 const int vm_options_file_pos,
3902 ScopedVMInitArgs* vm_options_file_args,
3903 ScopedVMInitArgs* args_out) {
3904 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3905 if (code != JNI_OK) {
3906 return code;
3907 }
3908
3909 if (vm_options_file_args->get()->nOptions < 1) {
3910 return JNI_OK;
3911 }
3912
3913 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3914 jio_fprintf(defaultStream::error_stream(),
3915 "A VM options file may not refer to a VM options file. "
3916 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3917 "options file '%s' in options container '%s' is an error.\n",
3918 vm_options_file_args->vm_options_file_arg(),
3919 vm_options_file_args->container_name());
3920 return JNI_EINVAL;
3921 }
3922
3923 return args_out->insert(args, vm_options_file_args->get(),
3924 vm_options_file_pos);
3925 }
3926
3927 // Expand -XX:VMOptionsFile found in args_in as needed.
3928 // mod_args and args_out parameters may return values as needed.
3929 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3930 ScopedVMInitArgs* mod_args,
3931 JavaVMInitArgs** args_out) {
3932 jint code = match_special_option_and_act(args_in, mod_args);
3933 if (code != JNI_OK) {
3934 return code;
3935 }
3936
3937 if (mod_args->is_set()) {
3938 // args_in contains -XX:VMOptionsFile and mod_args contains the
3939 // original options from args_in along with the options expanded
3940 // from the VMOptionsFile. Return a short-hand to the caller.
3941 *args_out = mod_args->get();
3942 } else {
3943 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3944 }
3945 return JNI_OK;
3946 }
3947
3948 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3949 ScopedVMInitArgs* args_out) {
3950 // Remaining part of option string
3951 const char* tail;
3952 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3953
3954 for (int index = 0; index < args->nOptions; index++) {
3955 const JavaVMOption* option = args->options + index;
3956 if (ArgumentsExt::process_options(option)) {
3957 continue;
3958 }
3959 if (match_option(option, "-XX:Flags=", &tail)) {
3960 Arguments::set_jvm_flags_file(tail);
3961 continue;
3962 }
3963 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3964 if (vm_options_file_args.found_vm_options_file_arg()) {
3965 jio_fprintf(defaultStream::error_stream(),
3966 "The option '%s' is already specified in the options "
3967 "container '%s' so the specification of '%s' in the "
3968 "same options container is an error.\n",
3969 vm_options_file_args.vm_options_file_arg(),
3970 vm_options_file_args.container_name(),
3971 option->optionString);
3972 return JNI_EINVAL;
3973 }
3974 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3975 // If there's a VMOptionsFile, parse that
3976 jint code = insert_vm_options_file(args, tail, index,
3977 &vm_options_file_args, args_out);
3978 if (code != JNI_OK) {
3979 return code;
3980 }
3981 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3982 if (args_out->is_set()) {
3983 // The VMOptions file inserted some options so switch 'args'
3984 // to the new set of options, and continue processing which
3985 // preserves "last option wins" semantics.
3986 args = args_out->get();
3987 // The first option from the VMOptionsFile replaces the
3988 // current option. So we back track to process the
3989 // replacement option.
3990 index--;
3991 }
3992 continue;
3993 }
3994 if (match_option(option, "-XX:+PrintVMOptions")) {
3995 PrintVMOptions = true;
3996 continue;
3997 }
3998 if (match_option(option, "-XX:-PrintVMOptions")) {
3999 PrintVMOptions = false;
4000 continue;
4001 }
4002 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4003 IgnoreUnrecognizedVMOptions = true;
4004 continue;
4005 }
4006 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4007 IgnoreUnrecognizedVMOptions = false;
4008 continue;
4009 }
4010 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4011 CommandLineFlags::printFlags(tty, false);
4012 vm_exit(0);
4013 }
4014 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4015 #if INCLUDE_NMT
4016 // The launcher did not setup nmt environment variable properly.
4017 if (!MemTracker::check_launcher_nmt_support(tail)) {
4018 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4019 }
4020
4021 // Verify if nmt option is valid.
4022 if (MemTracker::verify_nmt_option()) {
4023 // Late initialization, still in single-threaded mode.
4024 if (MemTracker::tracking_level() >= NMT_summary) {
4025 MemTracker::init();
4026 }
4027 } else {
4028 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4029 }
4030 continue;
4031 #else
4032 jio_fprintf(defaultStream::error_stream(),
4033 "Native Memory Tracking is not supported in this VM\n");
4034 return JNI_ERR;
4035 #endif
4036 }
4037
4038 #ifndef PRODUCT
4039 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4040 CommandLineFlags::printFlags(tty, true);
4041 vm_exit(0);
4042 }
4043 #endif
4044 }
4045 return JNI_OK;
4046 }
4047
4048 static void print_options(const JavaVMInitArgs *args) {
4049 const char* tail;
4050 for (int index = 0; index < args->nOptions; index++) {
4051 const JavaVMOption *option = args->options + index;
4052 if (match_option(option, "-XX:", &tail)) {
4053 logOption(tail);
4054 }
4055 }
4056 }
4057
4058 bool Arguments::handle_deprecated_print_gc_flags() {
4059 if (PrintGC) {
4060 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4061 }
4062 if (PrintGCDetails) {
4063 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4064 }
4065
4066 if (_gc_log_filename != NULL) {
4067 // -Xloggc was used to specify a filename
4068 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4069 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4070 } else if (PrintGC || PrintGCDetails) {
4071 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4072 }
4073 return true;
4074 }
4075
4076 // Parse entry point called from JNI_CreateJavaVM
4077
4078 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4079 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4080
4081 // Initialize ranges and constraints
4082 CommandLineFlagRangeList::init();
4083 CommandLineFlagConstraintList::init();
4084
4085 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4086 const char* hotspotrc = ".hotspotrc";
4087 bool settings_file_specified = false;
4088 bool needs_hotspotrc_warning = false;
4089 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4090 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4091
4092 // Pointers to current working set of containers
4093 JavaVMInitArgs* cur_cmd_args;
4094 JavaVMInitArgs* cur_java_options_args;
4095 JavaVMInitArgs* cur_java_tool_options_args;
4096
4097 // Containers for modified/expanded options
4098 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4099 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4100 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4101
4102
4103 jint code =
4104 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4105 if (code != JNI_OK) {
4106 return code;
4107 }
4108
4109 code = parse_java_options_environment_variable(&initial_java_options_args);
4110 if (code != JNI_OK) {
4111 return code;
4112 }
4113
4114 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4115 &mod_java_tool_options_args,
4116 &cur_java_tool_options_args);
4117 if (code != JNI_OK) {
4118 return code;
4119 }
4120
4121 code = expand_vm_options_as_needed(initial_cmd_args,
4122 &mod_cmd_args,
4123 &cur_cmd_args);
4124 if (code != JNI_OK) {
4125 return code;
4126 }
4127
4128 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4129 &mod_java_options_args,
4130 &cur_java_options_args);
4131 if (code != JNI_OK) {
4132 return code;
4133 }
4134
4135 const char* flags_file = Arguments::get_jvm_flags_file();
4136 settings_file_specified = (flags_file != NULL);
4137
4138 if (IgnoreUnrecognizedVMOptions) {
4139 cur_cmd_args->ignoreUnrecognized = true;
4140 cur_java_tool_options_args->ignoreUnrecognized = true;
4141 cur_java_options_args->ignoreUnrecognized = true;
4142 }
4143
4144 // Parse specified settings file
4145 if (settings_file_specified) {
4146 if (!process_settings_file(flags_file, true,
4147 cur_cmd_args->ignoreUnrecognized)) {
4148 return JNI_EINVAL;
4149 }
4150 } else {
4151 #ifdef ASSERT
4152 // Parse default .hotspotrc settings file
4153 if (!process_settings_file(".hotspotrc", false,
4154 cur_cmd_args->ignoreUnrecognized)) {
4155 return JNI_EINVAL;
4156 }
4157 #else
4158 struct stat buf;
4159 if (os::stat(hotspotrc, &buf) == 0) {
4160 needs_hotspotrc_warning = true;
4161 }
4162 #endif
4163 }
4164
4165 if (PrintVMOptions) {
4166 print_options(cur_java_tool_options_args);
4167 print_options(cur_cmd_args);
4168 print_options(cur_java_options_args);
4169 }
4170
4171 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4172 jint result = parse_vm_init_args(cur_java_tool_options_args,
4173 cur_java_options_args,
4174 cur_cmd_args);
4175
4176 if (result != JNI_OK) {
4177 return result;
4178 }
4179
4180 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4181 SharedArchivePath = get_shared_archive_path();
4182 if (SharedArchivePath == NULL) {
4183 return JNI_ENOMEM;
4184 }
4185
4186 // Set up VerifySharedSpaces
4187 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4188 VerifySharedSpaces = true;
4189 }
4190
4191 // Delay warning until here so that we've had a chance to process
4192 // the -XX:-PrintWarnings flag
4193 if (needs_hotspotrc_warning) {
4194 warning("%s file is present but has been ignored. "
4195 "Run with -XX:Flags=%s to load the file.",
4196 hotspotrc, hotspotrc);
4197 }
4198
4199 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4200 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4201 #endif
4202
4203 ArgumentsExt::report_unsupported_options();
4204
4205 #ifndef PRODUCT
4206 if (TraceBytecodesAt != 0) {
4207 TraceBytecodes = true;
4208 }
4209 if (CountCompiledCalls) {
4210 if (UseCounterDecay) {
4211 warning("UseCounterDecay disabled because CountCalls is set");
4212 UseCounterDecay = false;
4213 }
4214 }
4215 #endif // PRODUCT
4216
4217 if (ScavengeRootsInCode == 0) {
4218 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4219 warning("Forcing ScavengeRootsInCode non-zero");
4220 }
4221 ScavengeRootsInCode = 1;
4222 }
4223
4224 if (!handle_deprecated_print_gc_flags()) {
4225 return JNI_EINVAL;
4226 }
4227
4228 // Set object alignment values.
4229 set_object_alignment();
4230
4231 #if !INCLUDE_ALL_GCS
4232 force_serial_gc();
4233 #endif // INCLUDE_ALL_GCS
4234 #if !INCLUDE_CDS
4235 if (DumpSharedSpaces || RequireSharedSpaces) {
4236 jio_fprintf(defaultStream::error_stream(),
4237 "Shared spaces are not supported in this VM\n");
4238 return JNI_ERR;
4239 }
4240 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4241 warning("Shared spaces are not supported in this VM");
4242 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4243 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4244 }
4245 no_shared_spaces("CDS Disabled");
4246 #endif // INCLUDE_CDS
4247
4248 return JNI_OK;
4249 }
4250
4251 jint Arguments::apply_ergo() {
4252
4253 // Set flags based on ergonomics.
4254 set_ergonomics_flags();
4255
4256 set_shared_spaces_flags();
4257
4258 // Check the GC selections again.
4259 if (!check_gc_consistency()) {
4260 return JNI_EINVAL;
4261 }
4262
4263 if (TieredCompilation) {
4264 set_tiered_flags();
4265 } else {
4266 int max_compilation_policy_choice = 1;
4267 #ifdef COMPILER2
4268 max_compilation_policy_choice = 2;
4269 #endif
4270 // Check if the policy is valid.
4271 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4272 vm_exit_during_initialization(
4273 "Incompatible compilation policy selected", NULL);
4274 }
4275 // Scale CompileThreshold
4276 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4277 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4278 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4279 }
4280 }
4281
4282 #ifdef COMPILER2
4283 #ifndef PRODUCT
4284 if (PrintIdealGraphLevel > 0) {
4285 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4286 }
4287 #endif
4288 #endif
4289
4290 // Set heap size based on available physical memory
4291 set_heap_size();
4292
4293 ArgumentsExt::set_gc_specific_flags();
4294
4295 // Initialize Metaspace flags and alignments
4296 Metaspace::ergo_initialize();
4297
4298 // Set bytecode rewriting flags
4299 set_bytecode_flags();
4300
4301 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4302 jint code = set_aggressive_opts_flags();
4303 if (code != JNI_OK) {
4304 return code;
4305 }
4306
4307 // Turn off biased locking for locking debug mode flags,
4308 // which are subtly different from each other but neither works with
4309 // biased locking
4310 if (UseHeavyMonitors
4311 #ifdef COMPILER1
4312 || !UseFastLocking
4313 #endif // COMPILER1
4314 #if INCLUDE_JVMCI
4315 || !JVMCIUseFastLocking
4316 #endif
4317 ) {
4318 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4319 // flag set to true on command line; warn the user that they
4320 // can't enable biased locking here
4321 warning("Biased Locking is not supported with locking debug flags"
4322 "; ignoring UseBiasedLocking flag." );
4323 }
4324 UseBiasedLocking = false;
4325 }
4326
4327 #ifdef CC_INTERP
4328 // Clear flags not supported on zero.
4329 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4330 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4331 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4332 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4333 #endif // CC_INTERP
4334
4335 #ifdef COMPILER2
4336 if (!EliminateLocks) {
4337 EliminateNestedLocks = false;
4338 }
4339 if (!Inline) {
4340 IncrementalInline = false;
4341 }
4342 #ifndef PRODUCT
4343 if (!IncrementalInline) {
4344 AlwaysIncrementalInline = false;
4345 }
4346 #endif
4347 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4348 // nothing to use the profiling, turn if off
4349 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4350 }
4351 #endif
4352
4353 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4354 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4355 DebugNonSafepoints = true;
4356 }
4357
4358 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4359 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4360 }
4361
4362 #ifndef PRODUCT
4363 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4364 if (use_vm_log()) {
4365 LogVMOutput = true;
4366 }
4367 }
4368 #endif // PRODUCT
4369
4370 if (PrintCommandLineFlags) {
4371 CommandLineFlags::printSetFlags(tty);
4372 }
4373
4374 // Apply CPU specific policy for the BiasedLocking
4375 if (UseBiasedLocking) {
4376 if (!VM_Version::use_biased_locking() &&
4377 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4378 UseBiasedLocking = false;
4379 }
4380 }
4381 #ifdef COMPILER2
4382 if (!UseBiasedLocking || EmitSync != 0) {
4383 UseOptoBiasInlining = false;
4384 }
4385 #endif
4386
4387 return JNI_OK;
4388 }
4389
4390 jint Arguments::adjust_after_os() {
4391 if (UseNUMA) {
4392 if (UseParallelGC || UseParallelOldGC) {
4393 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4394 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4395 }
4396 }
4397 // UseNUMAInterleaving is set to ON for all collectors and
4398 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4399 // such as the parallel collector for Linux and Solaris will
4400 // interleave old gen and survivor spaces on top of NUMA
4401 // allocation policy for the eden space.
4402 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4403 // all platforms and ParallelGC on Windows will interleave all
4404 // of the heap spaces across NUMA nodes.
4405 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4406 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4407 }
4408 }
4409 return JNI_OK;
4410 }
4411
4412 int Arguments::PropertyList_count(SystemProperty* pl) {
4413 int count = 0;
4414 while(pl != NULL) {
4415 count++;
4416 pl = pl->next();
4417 }
4418 return count;
4419 }
4420
4421 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4422 assert(key != NULL, "just checking");
4423 SystemProperty* prop;
4424 for (prop = pl; prop != NULL; prop = prop->next()) {
4425 if (strcmp(key, prop->key()) == 0) return prop->value();
4426 }
4427 return NULL;
4428 }
4429
4430 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4431 int count = 0;
4432 const char* ret_val = NULL;
4433
4434 while(pl != NULL) {
4435 if(count >= index) {
4436 ret_val = pl->key();
4437 break;
4438 }
4439 count++;
4440 pl = pl->next();
4441 }
4442
4443 return ret_val;
4444 }
4445
4446 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4447 int count = 0;
4448 char* ret_val = NULL;
4449
4450 while(pl != NULL) {
4451 if(count >= index) {
4452 ret_val = pl->value();
4453 break;
4454 }
4455 count++;
4456 pl = pl->next();
4457 }
4458
4459 return ret_val;
4460 }
4461
4462 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4463 SystemProperty* p = *plist;
4464 if (p == NULL) {
4465 *plist = new_p;
4466 } else {
4467 while (p->next() != NULL) {
4468 p = p->next();
4469 }
4470 p->set_next(new_p);
4471 }
4472 }
4473
4474 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4475 if (plist == NULL)
4476 return;
4477
4478 SystemProperty* new_p = new SystemProperty(k, v, true);
4479 PropertyList_add(plist, new_p);
4480 }
4481
4482 void Arguments::PropertyList_add(SystemProperty *element) {
4483 PropertyList_add(&_system_properties, element);
4484 }
4485
4486 // This add maintains unique property key in the list.
4487 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4488 if (plist == NULL)
4489 return;
4490
4491 // If property key exist then update with new value.
4492 SystemProperty* prop;
4493 for (prop = *plist; prop != NULL; prop = prop->next()) {
4494 if (strcmp(k, prop->key()) == 0) {
4495 if (append) {
4496 prop->append_value(v);
4497 } else {
4498 prop->set_value(v);
4499 }
4500 return;
4501 }
4502 }
4503
4504 PropertyList_add(plist, k, v);
4505 }
4506
4507 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4508 // Returns true if all of the source pointed by src has been copied over to
4509 // the destination buffer pointed by buf. Otherwise, returns false.
4510 // Notes:
4511 // 1. If the length (buflen) of the destination buffer excluding the
4512 // NULL terminator character is not long enough for holding the expanded
4513 // pid characters, it also returns false instead of returning the partially
4514 // expanded one.
4515 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4516 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4517 char* buf, size_t buflen) {
4518 const char* p = src;
4519 char* b = buf;
4520 const char* src_end = &src[srclen];
4521 char* buf_end = &buf[buflen - 1];
4522
4523 while (p < src_end && b < buf_end) {
4524 if (*p == '%') {
4525 switch (*(++p)) {
4526 case '%': // "%%" ==> "%"
4527 *b++ = *p++;
4528 break;
4529 case 'p': { // "%p" ==> current process id
4530 // buf_end points to the character before the last character so
4531 // that we could write '\0' to the end of the buffer.
4532 size_t buf_sz = buf_end - b + 1;
4533 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4534
4535 // if jio_snprintf fails or the buffer is not long enough to hold
4536 // the expanded pid, returns false.
4537 if (ret < 0 || ret >= (int)buf_sz) {
4538 return false;
4539 } else {
4540 b += ret;
4541 assert(*b == '\0', "fail in copy_expand_pid");
4542 if (p == src_end && b == buf_end + 1) {
4543 // reach the end of the buffer.
4544 return true;
4545 }
4546 }
4547 p++;
4548 break;
4549 }
4550 default :
4551 *b++ = '%';
4552 }
4553 } else {
4554 *b++ = *p++;
4555 }
4556 }
4557 *b = '\0';
4558 return (p == src_end); // return false if not all of the source was copied
4559 }