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 char* Arguments::_jvm_flags_file = NULL;
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 size_t Arguments::_min_heap_size = 0;
80 Arguments::Mode Arguments::_mode = _mixed;
81 bool Arguments::_java_compiler = false;
82 bool Arguments::_xdebug_mode = false;
83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
85 int Arguments::_sun_java_launcher_pid = -1;
86 bool Arguments::_sun_java_launcher_is_altjvm = false;
87 int Arguments::_patch_dirs_count = 0;
88 char** Arguments::_patch_dirs = NULL;
89 int Arguments::_bootclassloader_append_index = -1;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 char* Arguments::SharedArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114
115 PathString *Arguments::_system_boot_class_path = NULL;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
120 // part of the option string.
121 static bool match_option(const JavaVMOption *option, const char* name,
122 const char** tail) {
123 size_t len = strlen(name);
124 if (strncmp(option->optionString, name, len) == 0) {
125 *tail = option->optionString + len;
126 return true;
127 } else {
128 return false;
129 }
130 }
131
132 // Check if 'option' matches 'name'. No "tail" is allowed.
133 static bool match_option(const JavaVMOption *option, const char* name) {
134 const char* tail = NULL;
135 bool result = match_option(option, name, &tail);
136 if (tail != NULL && *tail == '\0') {
137 return result;
138 } else {
139 return false;
140 }
141 }
142
143 // Return true if any of the strings in null-terminated array 'names' matches.
144 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
145 // the option must match exactly.
146 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
147 bool tail_allowed) {
148 for (/* empty */; *names != NULL; ++names) {
149 if (match_option(option, *names, tail)) {
150 if (**tail == '\0' || tail_allowed && **tail == ':') {
151 return true;
152 }
153 }
154 }
155 return false;
156 }
157
158 static void logOption(const char* opt) {
159 if (PrintVMOptions) {
160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
161 }
162 }
163
164 // Process java launcher properties.
165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
166 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
167 // sun.java.launcher.pid is defined.
168 // Must do this before setting up other system properties,
169 // as some of them may depend on launcher type.
170 for (int index = 0; index < args->nOptions; index++) {
171 const JavaVMOption* option = args->options + index;
172 const char* tail;
173
174 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
175 process_java_launcher_argument(tail, option->extraInfo);
176 continue;
177 }
178 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
179 if (strcmp(tail, "true") == 0) {
180 _sun_java_launcher_is_altjvm = true;
181 }
182 continue;
183 }
184 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
185 _sun_java_launcher_pid = atoi(tail);
186 continue;
187 }
188 }
189 }
190
191 // Initialize system properties key and value.
192 void Arguments::init_system_properties() {
193
194 // Set up _system_boot_class_path which is not a property but
195 // relies heavily on argument processing and the jdk.boot.class.path.append
196 // property. It is used to store the underlying system boot class path.
197 _system_boot_class_path = new PathString(NULL);
198
199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
200 "Java Virtual Machine Specification", false));
201 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
202 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
204 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
205
206 // Following are JVMTI agent writable properties.
207 // Properties values are set to NULL and they are
208 // os specific they are initialized in os::init_system_properties_values().
209 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
210 _java_library_path = new SystemProperty("java.library.path", NULL, true);
211 _java_home = new SystemProperty("java.home", NULL, true);
212 _java_class_path = new SystemProperty("java.class.path", "", true);
213 // jdk.boot.class.path.append is a non-writeable, internal property.
214 // It can only be set by either:
215 // - -Xbootclasspath/a:
216 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
217 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
218
219 // Add to System Property list.
220 PropertyList_add(&_system_properties, _sun_boot_library_path);
221 PropertyList_add(&_system_properties, _java_library_path);
222 PropertyList_add(&_system_properties, _java_home);
223 PropertyList_add(&_system_properties, _java_class_path);
224 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
225
226 // Set OS specific system properties values
227 os::init_system_properties_values();
228 }
229
230 // Update/Initialize System properties after JDK version number is known
231 void Arguments::init_version_specific_system_properties() {
232 enum { bufsz = 16 };
233 char buffer[bufsz];
234 const char* spec_vendor = "Oracle Corporation";
235 uint32_t spec_version = JDK_Version::current().major_version();
236
237 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
238
239 PropertyList_add(&_system_properties,
240 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
241 PropertyList_add(&_system_properties,
242 new SystemProperty("java.vm.specification.version", buffer, false));
243 PropertyList_add(&_system_properties,
244 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
245 }
246
247 /*
248 * -XX argument processing:
249 *
250 * -XX arguments are defined in several places, such as:
251 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
252 * -XX arguments are parsed in parse_argument().
253 * -XX argument bounds checking is done in check_vm_args_consistency().
254 *
255 * Over time -XX arguments may change. There are mechanisms to handle common cases:
256 *
257 * ALIASED: An option that is simply another name for another option. This is often
258 * part of the process of deprecating a flag, but not all aliases need
259 * to be deprecated.
260 *
261 * Create an alias for an option by adding the old and new option names to the
262 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
263 *
264 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
265 * support may be removed in the future. Both regular and aliased options may be
266 * deprecated.
267 *
268 * Add a deprecation warning for an option (or alias) by adding an entry in the
269 * "special_jvm_flags" table and setting the "deprecated_in" field.
270 * Often an option "deprecated" in one major release will
271 * be made "obsolete" in the next. In this case the entry should also have it's
272 * "obsolete_in" field set.
273 *
274 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
275 * on the command line. A warning is printed to let the user know that option might not
276 * be accepted in the future.
277 *
278 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
279 * table and setting the "obsolete_in" field.
280 *
281 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
282 * to the current JDK version. The system will flatly refuse to admit the existence of
283 * the flag. This allows a flag to die automatically over JDK releases.
284 *
285 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
286 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
287 * - Newly obsolete or expired deprecated options should have their global variable
288 * definitions removed (from globals.hpp, etc) and related implementations removed.
289 *
290 * Recommended approach for removing options:
291 *
292 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
293 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
294 *
295 * To remove internal options (e.g. diagnostic, experimental, develop options), use
296 * a 2-step model adding major release numbers to the obsolete and expire columns.
297 *
298 * To change the name of an option, use the alias table as well as a 2-step
299 * model adding major release numbers to the deprecate and expire columns.
300 * Think twice about aliasing commonly used customer options.
301 *
302 * There are times when it is appropriate to leave a future release number as undefined.
303 *
304 * Tests: Aliases should be tested in VMAliasOptions.java.
305 * Deprecated options should be tested in VMDeprecatedOptions.java.
306 */
307
308 // Obsolete or deprecated -XX flag.
309 typedef struct {
310 const char* name;
311 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
312 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
313 JDK_Version expired_in; // When the option expires (or "undefined").
314 } SpecialFlag;
315
316 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
317 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
318 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
319 // the command-line as usual, but will issue a warning.
320 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
321 // the command-line, while issuing a warning and ignoring the flag value.
322 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
323 // existence of the flag.
324 //
325 // MANUAL CLEANUP ON JDK VERSION UPDATES:
326 // This table ensures that the handling of options will update automatically when the JDK
327 // version is incremented, but the source code needs to be cleanup up manually:
328 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
329 // variable should be removed, as well as users of the variable.
330 // - As "deprecated" options age into "obsolete" options, move the entry into the
331 // "Obsolete Flags" section of the table.
332 // - All expired options should be removed from the table.
333 static SpecialFlag const special_jvm_flags[] = {
334 // -------------- Deprecated Flags --------------
335 // --- Non-alias flags - sorted by obsolete_in then expired_in:
336 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
337 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
338 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
339 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
340
341 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
342 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
343 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
344 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
345 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
346 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
347 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
348 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
349
350 // -------------- Obsolete Flags - sorted by expired_in --------------
351 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 #ifndef ZERO
365 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 #endif // ZERO
368 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
373 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
374 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
375 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
376 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
377 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
378 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
379
380 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
381 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
382 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
383 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
384 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
385 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
386 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
387 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
388 #endif
389
390 { NULL, JDK_Version(0), JDK_Version(0) }
391 };
392
393 // Flags that are aliases for other flags.
394 typedef struct {
395 const char* alias_name;
396 const char* real_name;
397 } AliasedFlag;
398
399 static AliasedFlag const aliased_jvm_flags[] = {
400 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
401 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
402 { "CMSMarkStackSize", "MarkStackSize" },
403 { "G1MarkStackSize", "MarkStackSize" },
404 { "ParallelMarkingThreads", "ConcGCThreads" },
405 { "ParallelCMSThreads", "ConcGCThreads" },
406 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
407 { "CMSClassUnloadingEnabled", "ClassUnloadingWithConcurrentMark" },
408 { NULL, NULL}
409 };
410
411 // NOTE: A compatibility request will be necessary for each alias to be removed.
412 static AliasedLoggingFlag const aliased_logging_flags[] = {
413 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
414 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
415 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(classload) },
416 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(classload, preorder) },
417 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(classpath) },
418 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(classresolve) },
419 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(classunload) },
420 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
421 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(classload, constraints) },
422 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
423 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepointcleanup) },
424 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
425 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
426 };
427
428 #ifndef PRODUCT
429 // These options are removed in jdk9. Remove this code for jdk10.
430 static AliasedFlag const removed_develop_logging_flags[] = {
431 { "TraceClassInitialization", "-Xlog:classinit" },
432 { "TraceClassLoaderData", "-Xlog:classloaderdata" },
433 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
434 { "TraceItables", "-Xlog:itables=debug" },
435 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
436 { "TraceSafepoint", "-Xlog:safepoint=debug" },
437 { "TraceStartupTime", "-Xlog:startuptime" },
438 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
439 { "PrintVtables", "-Xlog:vtables=debug" },
440 { "VerboseVerification", "-Xlog:verification" },
441 { NULL, NULL }
442 };
443 #endif //PRODUCT
444
445 // Return true if "v" is less than "other", where "other" may be "undefined".
446 static bool version_less_than(JDK_Version v, JDK_Version other) {
447 assert(!v.is_undefined(), "must be defined");
448 if (!other.is_undefined() && v.compare(other) >= 0) {
449 return false;
450 } else {
451 return true;
452 }
453 }
454
455 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
456 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
457 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
458 flag = special_jvm_flags[i];
459 return true;
460 }
461 }
462 return false;
463 }
464
465 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
466 assert(version != NULL, "Must provide a version buffer");
467 SpecialFlag flag;
468 if (lookup_special_flag(flag_name, flag)) {
469 if (!flag.obsolete_in.is_undefined()) {
470 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
471 *version = flag.obsolete_in;
472 return true;
473 }
474 }
475 }
476 return false;
477 }
478
479 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
480 assert(version != NULL, "Must provide a version buffer");
481 SpecialFlag flag;
482 if (lookup_special_flag(flag_name, flag)) {
483 if (!flag.deprecated_in.is_undefined()) {
484 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
485 version_less_than(JDK_Version::current(), flag.expired_in)) {
486 *version = flag.deprecated_in;
487 return 1;
488 } else {
489 return -1;
490 }
491 }
492 }
493 return 0;
494 }
495
496 #ifndef PRODUCT
497 const char* Arguments::removed_develop_logging_flag_name(const char* name){
498 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
499 const AliasedFlag& flag = removed_develop_logging_flags[i];
500 if (strcmp(flag.alias_name, name) == 0) {
501 return flag.real_name;
502 }
503 }
504 return NULL;
505 }
506 #endif // PRODUCT
507
508 const char* Arguments::real_flag_name(const char *flag_name) {
509 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
510 const AliasedFlag& flag_status = aliased_jvm_flags[i];
511 if (strcmp(flag_status.alias_name, flag_name) == 0) {
512 return flag_status.real_name;
513 }
514 }
515 return flag_name;
516 }
517
518 #ifdef ASSERT
519 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
520 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
521 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
522 return true;
523 }
524 }
525 return false;
526 }
527
528 static bool verify_special_jvm_flags() {
529 bool success = true;
530 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
531 const SpecialFlag& flag = special_jvm_flags[i];
532 if (lookup_special_flag(flag.name, i)) {
533 warning("Duplicate special flag declaration \"%s\"", flag.name);
534 success = false;
535 }
536 if (flag.deprecated_in.is_undefined() &&
537 flag.obsolete_in.is_undefined()) {
538 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
539 success = false;
540 }
541
542 if (!flag.deprecated_in.is_undefined()) {
543 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
544 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
545 success = false;
546 }
547
548 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
549 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
550 success = false;
551 }
552 }
553
554 if (!flag.obsolete_in.is_undefined()) {
555 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
556 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
557 success = false;
558 }
559
560 // if flag has become obsolete it should not have a "globals" flag defined anymore.
561 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
562 if (Flag::find_flag(flag.name) != NULL) {
563 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
564 success = false;
565 }
566 }
567 }
568
569 if (!flag.expired_in.is_undefined()) {
570 // if flag has become expired it should not have a "globals" flag defined anymore.
571 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
572 if (Flag::find_flag(flag.name) != NULL) {
573 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
574 success = false;
575 }
576 }
577 }
578
579 }
580 return success;
581 }
582 #endif
583
584 // Constructs the system boot class path from the following components, in order:
585 //
586 // prefix // from -Xpatch:...
587 // base // from os::get_system_properties()
588 // suffix // from -Xbootclasspath/a:...
589 //
590 // This could be AllStatic, but it isn't needed after argument processing is
591 // complete. After argument processing, the combined components are copied
592 // to Arguments::_system_boot_class_path via a call to Arguments::set_sysclasspath.
593 class ArgumentBootClassPath: public StackObj {
594 public:
595 ArgumentBootClassPath(const char* base);
596 ~ArgumentBootClassPath();
597
598 inline void set_base(const char* base);
599 inline void add_prefix(const char* prefix);
600 inline void add_suffix_to_prefix(const char* suffix);
601 inline void add_suffix(const char* suffix);
602 inline void reset_path(const char* base);
603
604 inline const char* get_base() const { return _items[_bcp_base]; }
605 inline const char* get_prefix() const { return _items[_bcp_prefix]; }
606 inline const char* get_suffix() const { return _items[_bcp_suffix]; }
607
608 // Combine all the components into a single c-heap-allocated string; caller
609 // must free the string if/when no longer needed.
610 char* combined_path();
611
612 private:
613 // Utility routines.
614 static char* add_to_path(const char* path, const char* str, bool prepend);
615 static char* add_jars_to_path(char* path, const char* directory);
616
617 inline void reset_item_at(int index);
618
619 // Array indices for the items that make up the sysclasspath. All except the
620 // base are allocated in the C heap and freed by this class.
621 enum {
622 _bcp_prefix, // was -Xpatch:...
623 _bcp_base, // the default system boot class path
624 _bcp_suffix, // from -Xbootclasspath/a:...
625 _bcp_nitems // the number of items, must be last.
626 };
627
628 const char* _items[_bcp_nitems];
629 };
630
631 ArgumentBootClassPath::ArgumentBootClassPath(const char* base) {
632 memset(_items, 0, sizeof(_items));
633 _items[_bcp_base] = base;
634 }
635
636 ArgumentBootClassPath::~ArgumentBootClassPath() {
637 // Free everything except the base.
638 for (int i = 0; i < _bcp_nitems; ++i) {
639 if (i != _bcp_base) reset_item_at(i);
640 }
641 }
642
643 inline void ArgumentBootClassPath::set_base(const char* base) {
644 _items[_bcp_base] = base;
645 }
646
647 inline void ArgumentBootClassPath::add_prefix(const char* prefix) {
648 _items[_bcp_prefix] = add_to_path(_items[_bcp_prefix], prefix, true);
649 }
650
651 inline void ArgumentBootClassPath::add_suffix_to_prefix(const char* suffix) {
652 _items[_bcp_prefix] = add_to_path(_items[_bcp_prefix], suffix, false);
653 }
654
655 inline void ArgumentBootClassPath::add_suffix(const char* suffix) {
656 _items[_bcp_suffix] = add_to_path(_items[_bcp_suffix], suffix, false);
657 }
658
659 inline void ArgumentBootClassPath::reset_item_at(int index) {
660 assert(index < _bcp_nitems && index != _bcp_base, "just checking");
661 if (_items[index] != NULL) {
662 FREE_C_HEAP_ARRAY(char, _items[index]);
663 _items[index] = NULL;
664 }
665 }
666
667 inline void ArgumentBootClassPath::reset_path(const char* base) {
668 // Clear the prefix and suffix.
669 reset_item_at(_bcp_prefix);
670 reset_item_at(_bcp_suffix);
671 set_base(base);
672 }
673
674 //------------------------------------------------------------------------------
675
676
677 // Combine the bootclasspath elements, some of which may be null, into a single
678 // c-heap-allocated string.
679 char* ArgumentBootClassPath::combined_path() {
680 assert(_items[_bcp_base] != NULL, "empty default sysclasspath");
681
682 size_t lengths[_bcp_nitems];
683 size_t total_len = 0;
684
685 const char separator = *os::path_separator();
686
687 // Get the lengths.
688 int i;
689 for (i = 0; i < _bcp_nitems; ++i) {
690 if (i == _bcp_suffix) {
691 // Record index of boot loader's append path.
692 Arguments::set_bootclassloader_append_index((int)total_len);
693 }
694 if (_items[i] != NULL) {
695 lengths[i] = strlen(_items[i]);
696 // Include space for the separator char (or a NULL for the last item).
697 total_len += lengths[i] + 1;
698 }
699 }
700 assert(total_len > 0, "empty sysclasspath not allowed");
701
702 // Copy the _items to a single string.
703 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtArguments);
704 char* cp_tmp = cp;
705 for (i = 0; i < _bcp_nitems; ++i) {
706 if (_items[i] != NULL) {
707 memcpy(cp_tmp, _items[i], lengths[i]);
708 cp_tmp += lengths[i];
709 *cp_tmp++ = separator;
710 }
711 }
712 *--cp_tmp = '\0'; // Replace the extra separator.
713 return cp;
714 }
715
716 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
717 char*
718 ArgumentBootClassPath::add_to_path(const char* path, const char* str, bool prepend) {
719 char *cp;
720
721 assert(str != NULL, "just checking");
722 if (path == NULL) {
723 size_t len = strlen(str) + 1;
724 cp = NEW_C_HEAP_ARRAY(char, len, mtArguments);
725 memcpy(cp, str, len); // copy the trailing null
726 } else {
727 const char separator = *os::path_separator();
728 size_t old_len = strlen(path);
729 size_t str_len = strlen(str);
730 size_t len = old_len + str_len + 2;
731
732 if (prepend) {
733 cp = NEW_C_HEAP_ARRAY(char, len, mtArguments);
734 char* cp_tmp = cp;
735 memcpy(cp_tmp, str, str_len);
736 cp_tmp += str_len;
737 *cp_tmp = separator;
738 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
739 FREE_C_HEAP_ARRAY(char, path);
740 } else {
741 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtArguments);
742 char* cp_tmp = cp + old_len;
743 *cp_tmp = separator;
744 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
745 }
746 }
747 return cp;
748 }
749
750 // Scan the directory and append any jar or zip files found to path.
751 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
752 char* ArgumentBootClassPath::add_jars_to_path(char* path, const char* directory) {
753 DIR* dir = os::opendir(directory);
754 if (dir == NULL) return path;
755
756 char dir_sep[2] = { '\0', '\0' };
757 size_t directory_len = strlen(directory);
758 const char fileSep = *os::file_separator();
759 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
760
761 /* Scan the directory for jars/zips, appending them to path. */
762 struct dirent *entry;
763 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
764 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
765 const char* name = entry->d_name;
766 const char* ext = name + strlen(name) - 4;
767 bool isJarOrZip = ext > name &&
768 (os::file_name_strcmp(ext, ".jar") == 0 ||
769 os::file_name_strcmp(ext, ".zip") == 0);
770 if (isJarOrZip) {
771 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtArguments);
772 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
773 path = add_to_path(path, jarpath, false);
774 FREE_C_HEAP_ARRAY(char, jarpath);
775 }
776 }
777 FREE_C_HEAP_ARRAY(char, dbuf);
778 os::closedir(dir);
779 return path;
780 }
781
782 // Parses a memory size specification string.
783 static bool atomull(const char *s, julong* result) {
784 julong n = 0;
785 int args_read = 0;
786 bool is_hex = false;
787 // Skip leading 0[xX] for hexadecimal
788 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
789 s += 2;
790 is_hex = true;
791 args_read = sscanf(s, JULONG_FORMAT_X, &n);
792 } else {
793 args_read = sscanf(s, JULONG_FORMAT, &n);
794 }
795 if (args_read != 1) {
796 return false;
797 }
798 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
799 s++;
800 }
801 // 4705540: illegal if more characters are found after the first non-digit
802 if (strlen(s) > 1) {
803 return false;
804 }
805 switch (*s) {
806 case 'T': case 't':
807 *result = n * G * K;
808 // Check for overflow.
809 if (*result/((julong)G * K) != n) return false;
810 return true;
811 case 'G': case 'g':
812 *result = n * G;
813 if (*result/G != n) return false;
814 return true;
815 case 'M': case 'm':
816 *result = n * M;
817 if (*result/M != n) return false;
818 return true;
819 case 'K': case 'k':
820 *result = n * K;
821 if (*result/K != n) return false;
822 return true;
823 case '\0':
824 *result = n;
825 return true;
826 default:
827 return false;
828 }
829 }
830
831 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
832 if (size < min_size) return arg_too_small;
833 // Check that size will fit in a size_t (only relevant on 32-bit)
834 if (size > max_uintx) return arg_too_big;
835 return arg_in_range;
836 }
837
838 // Describe an argument out of range error
839 void Arguments::describe_range_error(ArgsRange errcode) {
840 switch(errcode) {
841 case arg_too_big:
842 jio_fprintf(defaultStream::error_stream(),
843 "The specified size exceeds the maximum "
844 "representable size.\n");
845 break;
846 case arg_too_small:
847 case arg_unreadable:
848 case arg_in_range:
849 // do nothing for now
850 break;
851 default:
852 ShouldNotReachHere();
853 }
854 }
855
856 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
857 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
858 return true;
859 } else {
860 return false;
861 }
862 }
863
864 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
865 char* end;
866 errno = 0;
867 double v = strtod(value, &end);
868 if ((errno != 0) || (*end != 0)) {
869 return false;
870 }
871
872 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
873 return true;
874 }
875 return false;
876 }
877
878 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
879 julong v;
880 int int_v;
881 intx intx_v;
882 bool is_neg = false;
883 Flag* result = Flag::find_flag(name, strlen(name));
884
885 if (result == NULL) {
886 return false;
887 }
888
889 // Check the sign first since atomull() parses only unsigned values.
890 if (*value == '-') {
891 if (!result->is_intx() && !result->is_int()) {
892 return false;
893 }
894 value++;
895 is_neg = true;
896 }
897 if (!atomull(value, &v)) {
898 return false;
899 }
900 if (result->is_int()) {
901 int_v = (int) v;
902 if (is_neg) {
903 int_v = -int_v;
904 }
905 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
906 } else if (result->is_uint()) {
907 uint uint_v = (uint) v;
908 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
909 } else if (result->is_intx()) {
910 intx_v = (intx) v;
911 if (is_neg) {
912 intx_v = -intx_v;
913 }
914 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
915 } else if (result->is_uintx()) {
916 uintx uintx_v = (uintx) v;
917 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
918 } else if (result->is_uint64_t()) {
919 uint64_t uint64_t_v = (uint64_t) v;
920 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
921 } else if (result->is_size_t()) {
922 size_t size_t_v = (size_t) v;
923 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
924 } else {
925 return false;
926 }
927 }
928
929 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
930 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
931 // Contract: CommandLineFlags always returns a pointer that needs freeing.
932 FREE_C_HEAP_ARRAY(char, value);
933 return true;
934 }
935
936 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
937 const char* old_value = "";
938 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
939 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
940 size_t new_len = strlen(new_value);
941 const char* value;
942 char* free_this_too = NULL;
943 if (old_len == 0) {
944 value = new_value;
945 } else if (new_len == 0) {
946 value = old_value;
947 } else {
948 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments);
949 // each new setting adds another LINE to the switch:
950 sprintf(buf, "%s\n%s", old_value, new_value);
951 value = buf;
952 free_this_too = buf;
953 }
954 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
955 // CommandLineFlags always returns a pointer that needs freeing.
956 FREE_C_HEAP_ARRAY(char, value);
957 if (free_this_too != NULL) {
958 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
959 FREE_C_HEAP_ARRAY(char, free_this_too);
960 }
961 return true;
962 }
963
964 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
965 const char* real_name = real_flag_name(arg);
966 JDK_Version since = JDK_Version();
967 switch (is_deprecated_flag(arg, &since)) {
968 case -1:
969 return NULL; // obsolete or expired, don't process normally
970 case 0:
971 return real_name;
972 case 1: {
973 if (warn) {
974 char version[256];
975 since.to_string(version, sizeof(version));
976 if (real_name != arg) {
977 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
978 arg, version, real_name);
979 } else {
980 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
981 arg, version);
982 }
983 }
984 return real_name;
985 }
986 }
987 ShouldNotReachHere();
988 return NULL;
989 }
990
991 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
992 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
993 // Set tagset string buffer at max size of 256, large enough for any alias tagset
994 const int max_tagset_size = 256;
995 int max_tagset_len = max_tagset_size - 1;
996 char tagset_buffer[max_tagset_size];
997 tagset_buffer[0] = '\0';
998
999 // Write tag-set for aliased logging option, in string list form
1000 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1001 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1002 if (i > 0) {
1003 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1004 }
1005 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1006 }
1007
1008 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1009 (on) ? "+" : "-",
1010 name,
1011 tagset_buffer,
1012 (on) ? LogLevel::name(alf.level) : "off");
1013 }
1014
1015 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1016 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1017 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1018 if (strcmp(alf.alias_name, name) == 0) {
1019 log_deprecated_flag(name, on, alf);
1020 return alf;
1021 }
1022 }
1023 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1024 return a;
1025 }
1026
1027 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1028
1029 // range of acceptable characters spelled out for portability reasons
1030 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1031 #define BUFLEN 255
1032 char name[BUFLEN+1];
1033 char dummy;
1034 const char* real_name;
1035 bool warn_if_deprecated = true;
1036
1037 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1038 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1039 if (alf.alias_name != NULL){
1040 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1041 return true;
1042 }
1043 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1044 if (real_name == NULL) {
1045 return false;
1046 }
1047 return set_bool_flag(real_name, false, origin);
1048 }
1049 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1050 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1051 if (alf.alias_name != NULL){
1052 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1053 return true;
1054 }
1055 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1056 if (real_name == NULL) {
1057 return false;
1058 }
1059 return set_bool_flag(real_name, true, origin);
1060 }
1061
1062 char punct;
1063 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1064 const char* value = strchr(arg, '=') + 1;
1065 Flag* flag;
1066
1067 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1068 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1069 if (real_name == NULL) {
1070 return false;
1071 }
1072 flag = Flag::find_flag(real_name);
1073 if (flag != NULL && flag->is_ccstr()) {
1074 if (flag->ccstr_accumulates()) {
1075 return append_to_string_flag(real_name, value, origin);
1076 } else {
1077 if (value[0] == '\0') {
1078 value = NULL;
1079 }
1080 return set_string_flag(real_name, value, origin);
1081 }
1082 } else {
1083 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1084 }
1085 }
1086
1087 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1088 const char* value = strchr(arg, '=') + 1;
1089 // -XX:Foo:=xxx will reset the string flag to the given value.
1090 if (value[0] == '\0') {
1091 value = NULL;
1092 }
1093 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1094 if (real_name == NULL) {
1095 return false;
1096 }
1097 return set_string_flag(real_name, value, origin);
1098 }
1099
1100 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1101 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1102 #define NUMBER_RANGE "[0123456789eE+-]"
1103 char value[BUFLEN + 1];
1104 char value2[BUFLEN + 1];
1105 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1106 // Looks like a floating-point number -- try again with more lenient format string
1107 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1108 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1109 if (real_name == NULL) {
1110 return false;
1111 }
1112 return set_fp_numeric_flag(real_name, value, origin);
1113 }
1114 }
1115
1116 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1117 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1118 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1119 if (real_name == NULL) {
1120 return false;
1121 }
1122 return set_numeric_flag(real_name, value, origin);
1123 }
1124
1125 return false;
1126 }
1127
1128 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1129 assert(bldarray != NULL, "illegal argument");
1130
1131 if (arg == NULL) {
1132 return;
1133 }
1134
1135 int new_count = *count + 1;
1136
1137 // expand the array and add arg to the last element
1138 if (*bldarray == NULL) {
1139 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1140 } else {
1141 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1142 }
1143 (*bldarray)[*count] = os::strdup_check_oom(arg);
1144 *count = new_count;
1145 }
1146
1147 void Arguments::build_jvm_args(const char* arg) {
1148 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1149 }
1150
1151 void Arguments::build_jvm_flags(const char* arg) {
1152 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1153 }
1154
1155 // utility function to return a string that concatenates all
1156 // strings in a given char** array
1157 const char* Arguments::build_resource_string(char** args, int count) {
1158 if (args == NULL || count == 0) {
1159 return NULL;
1160 }
1161 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1162 for (int i = 1; i < count; i++) {
1163 length += strlen(args[i]) + 1; // add 1 for a space
1164 }
1165 char* s = NEW_RESOURCE_ARRAY(char, length);
1166 strcpy(s, args[0]);
1167 for (int j = 1; j < count; j++) {
1168 strcat(s, " ");
1169 strcat(s, args[j]);
1170 }
1171 return (const char*) s;
1172 }
1173
1174 void Arguments::print_on(outputStream* st) {
1175 st->print_cr("VM Arguments:");
1176 if (num_jvm_flags() > 0) {
1177 st->print("jvm_flags: "); print_jvm_flags_on(st);
1178 st->cr();
1179 }
1180 if (num_jvm_args() > 0) {
1181 st->print("jvm_args: "); print_jvm_args_on(st);
1182 st->cr();
1183 }
1184 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1185 if (_java_class_path != NULL) {
1186 char* path = _java_class_path->value();
1187 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1188 }
1189 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1190 }
1191
1192 void Arguments::print_summary_on(outputStream* st) {
1193 // Print the command line. Environment variables that are helpful for
1194 // reproducing the problem are written later in the hs_err file.
1195 // flags are from setting file
1196 if (num_jvm_flags() > 0) {
1197 st->print_raw("Settings File: ");
1198 print_jvm_flags_on(st);
1199 st->cr();
1200 }
1201 // args are the command line and environment variable arguments.
1202 st->print_raw("Command Line: ");
1203 if (num_jvm_args() > 0) {
1204 print_jvm_args_on(st);
1205 }
1206 // this is the classfile and any arguments to the java program
1207 if (java_command() != NULL) {
1208 st->print("%s", java_command());
1209 }
1210 st->cr();
1211 }
1212
1213 void Arguments::print_jvm_flags_on(outputStream* st) {
1214 if (_num_jvm_flags > 0) {
1215 for (int i=0; i < _num_jvm_flags; i++) {
1216 st->print("%s ", _jvm_flags_array[i]);
1217 }
1218 }
1219 }
1220
1221 void Arguments::print_jvm_args_on(outputStream* st) {
1222 if (_num_jvm_args > 0) {
1223 for (int i=0; i < _num_jvm_args; i++) {
1224 st->print("%s ", _jvm_args_array[i]);
1225 }
1226 }
1227 }
1228
1229 bool Arguments::process_argument(const char* arg,
1230 jboolean ignore_unrecognized,
1231 Flag::Flags origin) {
1232 JDK_Version since = JDK_Version();
1233
1234 if (parse_argument(arg, origin)) {
1235 return true;
1236 }
1237
1238 // Determine if the flag has '+', '-', or '=' characters.
1239 bool has_plus_minus = (*arg == '+' || *arg == '-');
1240 const char* const argname = has_plus_minus ? arg + 1 : arg;
1241
1242 size_t arg_len;
1243 const char* equal_sign = strchr(argname, '=');
1244 if (equal_sign == NULL) {
1245 arg_len = strlen(argname);
1246 } else {
1247 arg_len = equal_sign - argname;
1248 }
1249
1250 // Only make the obsolete check for valid arguments.
1251 if (arg_len <= BUFLEN) {
1252 // Construct a string which consists only of the argument name without '+', '-', or '='.
1253 char stripped_argname[BUFLEN+1];
1254 strncpy(stripped_argname, argname, arg_len);
1255 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1256 if (is_obsolete_flag(stripped_argname, &since)) {
1257 char version[256];
1258 since.to_string(version, sizeof(version));
1259 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1260 return true;
1261 }
1262 #ifndef PRODUCT
1263 else {
1264 const char* replacement;
1265 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1266 log_warning(arguments)("%s has been removed. Please use %s instead.",
1267 stripped_argname,
1268 replacement);
1269 return false;
1270 }
1271 }
1272 #endif //PRODUCT
1273 }
1274
1275 // For locked flags, report a custom error message if available.
1276 // Otherwise, report the standard unrecognized VM option.
1277 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1278 if (found_flag != NULL) {
1279 char locked_message_buf[BUFLEN];
1280 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1281 if (strlen(locked_message_buf) == 0) {
1282 if (found_flag->is_bool() && !has_plus_minus) {
1283 jio_fprintf(defaultStream::error_stream(),
1284 "Missing +/- setting for VM option '%s'\n", argname);
1285 } else if (!found_flag->is_bool() && has_plus_minus) {
1286 jio_fprintf(defaultStream::error_stream(),
1287 "Unexpected +/- setting in VM option '%s'\n", argname);
1288 } else {
1289 jio_fprintf(defaultStream::error_stream(),
1290 "Improperly specified VM option '%s'\n", argname);
1291 }
1292 } else {
1293 #ifdef PRODUCT
1294 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1295 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1296 if (ignore_unrecognized && mismatched) {
1297 return true;
1298 }
1299 #endif
1300 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1301 }
1302 } else {
1303 if (ignore_unrecognized) {
1304 return true;
1305 }
1306 jio_fprintf(defaultStream::error_stream(),
1307 "Unrecognized VM option '%s'\n", argname);
1308 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1309 if (fuzzy_matched != NULL) {
1310 jio_fprintf(defaultStream::error_stream(),
1311 "Did you mean '%s%s%s'? ",
1312 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1313 fuzzy_matched->_name,
1314 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1315 }
1316 }
1317
1318 // allow for commandline "commenting out" options like -XX:#+Verbose
1319 return arg[0] == '#';
1320 }
1321
1322 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1323 FILE* stream = fopen(file_name, "rb");
1324 if (stream == NULL) {
1325 if (should_exist) {
1326 jio_fprintf(defaultStream::error_stream(),
1327 "Could not open settings file %s\n", file_name);
1328 return false;
1329 } else {
1330 return true;
1331 }
1332 }
1333
1334 char token[1024];
1335 int pos = 0;
1336
1337 bool in_white_space = true;
1338 bool in_comment = false;
1339 bool in_quote = false;
1340 char quote_c = 0;
1341 bool result = true;
1342
1343 int c = getc(stream);
1344 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1345 if (in_white_space) {
1346 if (in_comment) {
1347 if (c == '\n') in_comment = false;
1348 } else {
1349 if (c == '#') in_comment = true;
1350 else if (!isspace(c)) {
1351 in_white_space = false;
1352 token[pos++] = c;
1353 }
1354 }
1355 } else {
1356 if (c == '\n' || (!in_quote && isspace(c))) {
1357 // token ends at newline, or at unquoted whitespace
1358 // this allows a way to include spaces in string-valued options
1359 token[pos] = '\0';
1360 logOption(token);
1361 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1362 build_jvm_flags(token);
1363 pos = 0;
1364 in_white_space = true;
1365 in_quote = false;
1366 } else if (!in_quote && (c == '\'' || c == '"')) {
1367 in_quote = true;
1368 quote_c = c;
1369 } else if (in_quote && (c == quote_c)) {
1370 in_quote = false;
1371 } else {
1372 token[pos++] = c;
1373 }
1374 }
1375 c = getc(stream);
1376 }
1377 if (pos > 0) {
1378 token[pos] = '\0';
1379 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1380 build_jvm_flags(token);
1381 }
1382 fclose(stream);
1383 return result;
1384 }
1385
1386 //=============================================================================================================
1387 // Parsing of properties (-D)
1388
1389 const char* Arguments::get_property(const char* key) {
1390 return PropertyList_get_value(system_properties(), key);
1391 }
1392
1393 bool Arguments::add_property(const char* prop) {
1394 const char* eq = strchr(prop, '=');
1395 const char* key;
1396 const char* value = "";
1397
1398 if (eq == NULL) {
1399 // property doesn't have a value, thus use passed string
1400 key = prop;
1401 } else {
1402 // property have a value, thus extract it and save to the
1403 // allocated string
1404 size_t key_len = eq - prop;
1405 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1406
1407 strncpy(tmp_key, prop, key_len);
1408 tmp_key[key_len] = '\0';
1409 key = tmp_key;
1410
1411 value = &prop[key_len + 1];
1412 }
1413
1414 if (strcmp(key, "java.compiler") == 0) {
1415 process_java_compiler_argument(value);
1416 // Record value in Arguments, but let it get passed to Java.
1417 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1418 strcmp(key, "sun.java.launcher.pid") == 0) {
1419 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1420 // private and are processed in process_sun_java_launcher_properties();
1421 // the sun.java.launcher property is passed on to the java application
1422 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1423 PropertyList_unique_add(&_system_properties, key, value, true);
1424 } else {
1425 if (strcmp(key, "sun.java.command") == 0) {
1426 char *old_java_command = _java_command;
1427 _java_command = os::strdup_check_oom(value, mtArguments);
1428 if (old_java_command != NULL) {
1429 os::free(old_java_command);
1430 }
1431 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1432 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1433 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1434 // its value without going through the property list or making a Java call.
1435 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1436 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1437 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1438 os::free((void *)old_java_vendor_url_bug);
1439 }
1440 }
1441
1442 // Create new property and add at the end of the list
1443 PropertyList_unique_add(&_system_properties, key, value);
1444 }
1445
1446 if (key != prop) {
1447 // SystemProperty copy passed value, thus free previously allocated
1448 // memory
1449 FreeHeap((void *)key);
1450 }
1451
1452 return true;
1453 }
1454
1455 // sets or adds a module name to the jdk.launcher.addmods property
1456 bool Arguments::append_to_addmods_property(const char* module_name) {
1457 const char* key = "jdk.launcher.addmods";
1458 const char* old_value = Arguments::get_property(key);
1459 size_t buf_len = strlen(key) + strlen(module_name) + 2;
1460 if (old_value != NULL) {
1461 buf_len += strlen(old_value) + 1;
1462 }
1463 char* new_value = AllocateHeap(buf_len, mtArguments);
1464 if (new_value == NULL) {
1465 return false;
1466 }
1467 if (old_value == NULL) {
1468 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name);
1469 } else {
1470 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name);
1471 }
1472 bool added = add_property(new_value);
1473 FreeHeap(new_value);
1474 return added;
1475 }
1476
1477 #if INCLUDE_CDS
1478 void Arguments::check_unsupported_dumping_properties() {
1479 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1480 const char* unsupported_properties[5] = { "jdk.module.main",
1481 "jdk.module.path",
1482 "jdk.upgrade.module.path",
1483 "jdk.launcher.addmods",
1484 "jdk.launcher.limitmods" };
1485 const char* unsupported_options[5] = { "-m",
1486 "-modulepath",
1487 "-upgrademodulepath",
1488 "-addmods",
1489 "-limitmods" };
1490 SystemProperty* sp = system_properties();
1491 while (sp != NULL) {
1492 for (int i = 0; i < 5; i++) {
1493 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1494 vm_exit_during_initialization(
1495 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1496 }
1497 }
1498 sp = sp->next();
1499 }
1500 }
1501 #endif
1502
1503 //===========================================================================================================
1504 // Setting int/mixed/comp mode flags
1505
1506 void Arguments::set_mode_flags(Mode mode) {
1507 // Set up default values for all flags.
1508 // If you add a flag to any of the branches below,
1509 // add a default value for it here.
1510 set_java_compiler(false);
1511 _mode = mode;
1512
1513 // Ensure Agent_OnLoad has the correct initial values.
1514 // This may not be the final mode; mode may change later in onload phase.
1515 PropertyList_unique_add(&_system_properties, "java.vm.info",
1516 VM_Version::vm_info_string(), false);
1517
1518 UseInterpreter = true;
1519 UseCompiler = true;
1520 UseLoopCounter = true;
1521
1522 // Default values may be platform/compiler dependent -
1523 // use the saved values
1524 ClipInlining = Arguments::_ClipInlining;
1525 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1526 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1527 BackgroundCompilation = Arguments::_BackgroundCompilation;
1528 if (TieredCompilation) {
1529 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1530 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1531 }
1532 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1533 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1534 }
1535 }
1536
1537 // Change from defaults based on mode
1538 switch (mode) {
1539 default:
1540 ShouldNotReachHere();
1541 break;
1542 case _int:
1543 UseCompiler = false;
1544 UseLoopCounter = false;
1545 AlwaysCompileLoopMethods = false;
1546 UseOnStackReplacement = false;
1547 break;
1548 case _mixed:
1549 // same as default
1550 break;
1551 case _comp:
1552 UseInterpreter = false;
1553 BackgroundCompilation = false;
1554 ClipInlining = false;
1555 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1556 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1557 // compile a level 4 (C2) and then continue executing it.
1558 if (TieredCompilation) {
1559 Tier3InvokeNotifyFreqLog = 0;
1560 Tier4InvocationThreshold = 0;
1561 }
1562 break;
1563 }
1564 }
1565
1566 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1567 // Conflict: required to use shared spaces (-Xshare:on), but
1568 // incompatible command line options were chosen.
1569
1570 static void no_shared_spaces(const char* message) {
1571 if (RequireSharedSpaces) {
1572 jio_fprintf(defaultStream::error_stream(),
1573 "Class data sharing is inconsistent with other specified options.\n");
1574 vm_exit_during_initialization("Unable to use shared archive.", message);
1575 } else {
1576 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1577 }
1578 }
1579 #endif
1580
1581 // Returns threshold scaled with the value of scale.
1582 // If scale < 0.0, threshold is returned without scaling.
1583 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1584 if (scale == 1.0 || scale < 0.0) {
1585 return threshold;
1586 } else {
1587 return (intx)(threshold * scale);
1588 }
1589 }
1590
1591 // Returns freq_log scaled with the value of scale.
1592 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1593 // If scale < 0.0, freq_log is returned without scaling.
1594 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1595 // Check if scaling is necessary or if negative value was specified.
1596 if (scale == 1.0 || scale < 0.0) {
1597 return freq_log;
1598 }
1599 // Check values to avoid calculating log2 of 0.
1600 if (scale == 0.0 || freq_log == 0) {
1601 return 0;
1602 }
1603 // Determine the maximum notification frequency value currently supported.
1604 // The largest mask value that the interpreter/C1 can handle is
1605 // of length InvocationCounter::number_of_count_bits. Mask values are always
1606 // one bit shorter then the value of the notification frequency. Set
1607 // max_freq_bits accordingly.
1608 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1609 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1610 if (scaled_freq == 0) {
1611 // Return 0 right away to avoid calculating log2 of 0.
1612 return 0;
1613 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1614 return max_freq_bits;
1615 } else {
1616 return log2_intptr(scaled_freq);
1617 }
1618 }
1619
1620 void Arguments::set_tiered_flags() {
1621 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1622 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1623 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1624 }
1625 if (CompilationPolicyChoice < 2) {
1626 vm_exit_during_initialization(
1627 "Incompatible compilation policy selected", NULL);
1628 }
1629 // Increase the code cache size - tiered compiles a lot more.
1630 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1631 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1632 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1633 }
1634 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1635 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1636 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1637 }
1638 if (!UseInterpreter) { // -Xcomp
1639 Tier3InvokeNotifyFreqLog = 0;
1640 Tier4InvocationThreshold = 0;
1641 }
1642
1643 if (CompileThresholdScaling < 0) {
1644 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1645 }
1646
1647 // Scale tiered compilation thresholds.
1648 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1649 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1650 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1651 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1652
1653 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1654 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1655 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1656 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1657
1658 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1659 // once these thresholds become supported.
1660
1661 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1662 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1663
1664 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1665 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1666
1667 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1668
1669 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1670 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1671 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1672 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1673 }
1674 }
1675
1676 #if INCLUDE_ALL_GCS
1677 static void disable_adaptive_size_policy(const char* collector_name) {
1678 if (UseAdaptiveSizePolicy) {
1679 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1680 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1681 collector_name);
1682 }
1683 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1684 }
1685 }
1686
1687 void Arguments::set_parnew_gc_flags() {
1688 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1689 "control point invariant");
1690 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1691 assert(UseParNewGC, "ParNew should always be used with CMS");
1692
1693 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1694 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1695 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1696 } else if (ParallelGCThreads == 0) {
1697 jio_fprintf(defaultStream::error_stream(),
1698 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1699 vm_exit(1);
1700 }
1701
1702 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1703 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1704 // we set them to 1024 and 1024.
1705 // See CR 6362902.
1706 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1707 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1708 }
1709 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1710 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1711 }
1712
1713 // When using compressed oops, we use local overflow stacks,
1714 // rather than using a global overflow list chained through
1715 // the klass word of the object's pre-image.
1716 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1717 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1718 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1719 }
1720 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1721 }
1722 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1723 }
1724
1725 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1726 // sparc/solaris for certain applications, but would gain from
1727 // further optimization and tuning efforts, and would almost
1728 // certainly gain from analysis of platform and environment.
1729 void Arguments::set_cms_and_parnew_gc_flags() {
1730 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1731 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1732 assert(UseParNewGC, "ParNew should always be used with CMS");
1733
1734 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1735 disable_adaptive_size_policy("UseConcMarkSweepGC");
1736
1737 set_parnew_gc_flags();
1738
1739 size_t max_heap = align_size_down(MaxHeapSize,
1740 CardTableRS::ct_max_alignment_constraint());
1741
1742 // Now make adjustments for CMS
1743 intx tenuring_default = (intx)6;
1744 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1745
1746 // Preferred young gen size for "short" pauses:
1747 // upper bound depends on # of threads and NewRatio.
1748 const size_t preferred_max_new_size_unaligned =
1749 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1750 size_t preferred_max_new_size =
1751 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1752
1753 // Unless explicitly requested otherwise, size young gen
1754 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1755
1756 // If either MaxNewSize or NewRatio is set on the command line,
1757 // assume the user is trying to set the size of the young gen.
1758 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1759
1760 // Set MaxNewSize to our calculated preferred_max_new_size unless
1761 // NewSize was set on the command line and it is larger than
1762 // preferred_max_new_size.
1763 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1764 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1765 } else {
1766 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1767 }
1768 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1769
1770 // Code along this path potentially sets NewSize and OldSize
1771 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1772 min_heap_size(), InitialHeapSize, max_heap);
1773 size_t min_new = preferred_max_new_size;
1774 if (FLAG_IS_CMDLINE(NewSize)) {
1775 min_new = NewSize;
1776 }
1777 if (max_heap > min_new && min_heap_size() > min_new) {
1778 // Unless explicitly requested otherwise, make young gen
1779 // at least min_new, and at most preferred_max_new_size.
1780 if (FLAG_IS_DEFAULT(NewSize)) {
1781 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1782 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1783 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1784 }
1785 // Unless explicitly requested otherwise, size old gen
1786 // so it's NewRatio x of NewSize.
1787 if (FLAG_IS_DEFAULT(OldSize)) {
1788 if (max_heap > NewSize) {
1789 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1790 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1791 }
1792 }
1793 }
1794 }
1795 // Unless explicitly requested otherwise, definitely
1796 // promote all objects surviving "tenuring_default" scavenges.
1797 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1798 FLAG_IS_DEFAULT(SurvivorRatio)) {
1799 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1800 }
1801 // If we decided above (or user explicitly requested)
1802 // `promote all' (via MaxTenuringThreshold := 0),
1803 // prefer minuscule survivor spaces so as not to waste
1804 // space for (non-existent) survivors
1805 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1806 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1807 }
1808
1809 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1810 // but rather the number of free blocks of a given size that are used when
1811 // replenishing the local per-worker free list caches.
1812 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1813 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1814 // OldPLAB sizing manually turned off: Use a larger default setting,
1815 // unless it was manually specified. This is because a too-low value
1816 // will slow down scavenges.
1817 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1818 } else {
1819 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1820 }
1821 }
1822
1823 // If either of the static initialization defaults have changed, note this
1824 // modification.
1825 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1826 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1827 }
1828
1829 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1830 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1831 }
1832 #endif // INCLUDE_ALL_GCS
1833
1834 void set_object_alignment() {
1835 // Object alignment.
1836 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1837 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1838 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1839 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1840 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1841 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1842
1843 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1844 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1845
1846 // Oop encoding heap max
1847 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1848
1849 if (SurvivorAlignmentInBytes == 0) {
1850 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1851 }
1852
1853 #if INCLUDE_ALL_GCS
1854 // Set CMS global values
1855 CompactibleFreeListSpace::set_cms_values();
1856 #endif // INCLUDE_ALL_GCS
1857 }
1858
1859 size_t Arguments::max_heap_for_compressed_oops() {
1860 // Avoid sign flip.
1861 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1862 // We need to fit both the NULL page and the heap into the memory budget, while
1863 // keeping alignment constraints of the heap. To guarantee the latter, as the
1864 // NULL page is located before the heap, we pad the NULL page to the conservative
1865 // maximum alignment that the GC may ever impose upon the heap.
1866 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1867 _conservative_max_heap_alignment);
1868
1869 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1870 NOT_LP64(ShouldNotReachHere(); return 0);
1871 }
1872
1873 bool Arguments::should_auto_select_low_pause_collector() {
1874 if (UseAutoGCSelectPolicy &&
1875 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1876 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1877 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1878 return true;
1879 }
1880 return false;
1881 }
1882
1883 void Arguments::set_use_compressed_oops() {
1884 #ifndef ZERO
1885 #ifdef _LP64
1886 // MaxHeapSize is not set up properly at this point, but
1887 // the only value that can override MaxHeapSize if we are
1888 // to use UseCompressedOops is InitialHeapSize.
1889 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1890
1891 if (max_heap_size <= max_heap_for_compressed_oops()) {
1892 #if !defined(COMPILER1) || defined(TIERED)
1893 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1894 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1895 }
1896 #endif
1897 } else {
1898 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1899 warning("Max heap size too large for Compressed Oops");
1900 FLAG_SET_DEFAULT(UseCompressedOops, false);
1901 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1902 }
1903 }
1904 #endif // _LP64
1905 #endif // ZERO
1906 }
1907
1908
1909 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1910 // set_use_compressed_oops().
1911 void Arguments::set_use_compressed_klass_ptrs() {
1912 #ifndef ZERO
1913 #ifdef _LP64
1914 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1915 if (!UseCompressedOops) {
1916 if (UseCompressedClassPointers) {
1917 warning("UseCompressedClassPointers requires UseCompressedOops");
1918 }
1919 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1920 } else {
1921 // Turn on UseCompressedClassPointers too
1922 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1923 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1924 }
1925 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1926 if (UseCompressedClassPointers) {
1927 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1928 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1929 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1930 }
1931 }
1932 }
1933 #endif // _LP64
1934 #endif // !ZERO
1935 }
1936
1937 void Arguments::set_conservative_max_heap_alignment() {
1938 // The conservative maximum required alignment for the heap is the maximum of
1939 // the alignments imposed by several sources: any requirements from the heap
1940 // itself, the collector policy and the maximum page size we may run the VM
1941 // with.
1942 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1943 #if INCLUDE_ALL_GCS
1944 if (UseParallelGC) {
1945 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1946 } else if (UseG1GC) {
1947 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1948 }
1949 #endif // INCLUDE_ALL_GCS
1950 _conservative_max_heap_alignment = MAX4(heap_alignment,
1951 (size_t)os::vm_allocation_granularity(),
1952 os::max_page_size(),
1953 CollectorPolicy::compute_heap_alignment());
1954 }
1955
1956 bool Arguments::gc_selected() {
1957 #if INCLUDE_ALL_GCS
1958 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1959 #else
1960 return UseSerialGC;
1961 #endif // INCLUDE_ALL_GCS
1962 }
1963
1964 void Arguments::select_gc_ergonomically() {
1965 #if INCLUDE_ALL_GCS
1966 if (os::is_server_class_machine()) {
1967 if (should_auto_select_low_pause_collector()) {
1968 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1969 } else {
1970 #if defined(JAVASE_EMBEDDED)
1971 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1972 #else
1973 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1974 #endif
1975 }
1976 } else {
1977 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1978 }
1979 #else
1980 UNSUPPORTED_OPTION(UseG1GC);
1981 UNSUPPORTED_OPTION(UseParallelGC);
1982 UNSUPPORTED_OPTION(UseParallelOldGC);
1983 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1984 UNSUPPORTED_OPTION(UseParNewGC);
1985 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1986 #endif // INCLUDE_ALL_GCS
1987 }
1988
1989 void Arguments::select_gc() {
1990 if (!gc_selected()) {
1991 select_gc_ergonomically();
1992 if (!gc_selected()) {
1993 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1994 }
1995 }
1996 }
1997
1998 void Arguments::set_ergonomics_flags() {
1999 select_gc();
2000
2001 #if defined(COMPILER2) || INCLUDE_JVMCI
2002 // Shared spaces work fine with other GCs but causes bytecode rewriting
2003 // to be disabled, which hurts interpreter performance and decreases
2004 // server performance. When -server is specified, keep the default off
2005 // unless it is asked for. Future work: either add bytecode rewriting
2006 // at link time, or rewrite bytecodes in non-shared methods.
2007 if (!DumpSharedSpaces && !RequireSharedSpaces &&
2008 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
2009 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
2010 }
2011 #endif
2012
2013 set_conservative_max_heap_alignment();
2014
2015 #ifndef ZERO
2016 #ifdef _LP64
2017 set_use_compressed_oops();
2018
2019 // set_use_compressed_klass_ptrs() must be called after calling
2020 // set_use_compressed_oops().
2021 set_use_compressed_klass_ptrs();
2022
2023 // Also checks that certain machines are slower with compressed oops
2024 // in vm_version initialization code.
2025 #endif // _LP64
2026 #endif // !ZERO
2027
2028 CodeCacheExtensions::set_ergonomics_flags();
2029 }
2030
2031 void Arguments::set_parallel_gc_flags() {
2032 assert(UseParallelGC || UseParallelOldGC, "Error");
2033 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
2034 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
2035 FLAG_SET_DEFAULT(UseParallelOldGC, true);
2036 }
2037 FLAG_SET_DEFAULT(UseParallelGC, true);
2038
2039 // If no heap maximum was requested explicitly, use some reasonable fraction
2040 // of the physical memory, up to a maximum of 1GB.
2041 FLAG_SET_DEFAULT(ParallelGCThreads,
2042 Abstract_VM_Version::parallel_worker_threads());
2043 if (ParallelGCThreads == 0) {
2044 jio_fprintf(defaultStream::error_stream(),
2045 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
2046 vm_exit(1);
2047 }
2048
2049 if (UseAdaptiveSizePolicy) {
2050 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
2051 // unless the user actually sets these flags.
2052 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
2053 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
2054 }
2055 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
2056 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
2057 }
2058 }
2059
2060 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
2061 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
2062 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
2063 // See CR 6362902 for details.
2064 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
2065 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
2066 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
2067 }
2068 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
2069 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
2070 }
2071 }
2072
2073 if (UseParallelOldGC) {
2074 // Par compact uses lower default values since they are treated as
2075 // minimums. These are different defaults because of the different
2076 // interpretation and are not ergonomically set.
2077 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
2078 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
2079 }
2080 }
2081 }
2082
2083 void Arguments::set_g1_gc_flags() {
2084 assert(UseG1GC, "Error");
2085 #if defined(COMPILER1) || INCLUDE_JVMCI
2086 FastTLABRefill = false;
2087 #endif
2088 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
2089 if (ParallelGCThreads == 0) {
2090 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
2091 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
2092 }
2093
2094 #if INCLUDE_ALL_GCS
2095 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
2096 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
2097 }
2098 #endif
2099
2100 // MarkStackSize will be set (if it hasn't been set by the user)
2101 // when concurrent marking is initialized.
2102 // Its value will be based upon the number of parallel marking threads.
2103 // But we do set the maximum mark stack size here.
2104 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
2105 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
2106 }
2107
2108 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
2109 // In G1, we want the default GC overhead goal to be higher than
2110 // it is for PS, or the heap might be expanded too aggressively.
2111 // We set it here to ~8%.
2112 FLAG_SET_DEFAULT(GCTimeRatio, 12);
2113 }
2114
2115 // Below, we might need to calculate the pause time interval based on
2116 // the pause target. When we do so we are going to give G1 maximum
2117 // flexibility and allow it to do pauses when it needs to. So, we'll
2118 // arrange that the pause interval to be pause time target + 1 to
2119 // ensure that a) the pause time target is maximized with respect to
2120 // the pause interval and b) we maintain the invariant that pause
2121 // time target < pause interval. If the user does not want this
2122 // maximum flexibility, they will have to set the pause interval
2123 // explicitly.
2124
2125 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
2126 // The default pause time target in G1 is 200ms
2127 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
2128 }
2129
2130 // Then, if the interval parameter was not set, set it according to
2131 // the pause time target (this will also deal with the case when the
2132 // pause time target is the default value).
2133 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
2134 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
2135 }
2136
2137 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
2138 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
2139 }
2140
2141 void Arguments::set_gc_specific_flags() {
2142 #if INCLUDE_ALL_GCS
2143 // Set per-collector flags
2144 if (UseParallelGC || UseParallelOldGC) {
2145 set_parallel_gc_flags();
2146 } else if (UseConcMarkSweepGC) {
2147 set_cms_and_parnew_gc_flags();
2148 } else if (UseG1GC) {
2149 set_g1_gc_flags();
2150 }
2151 if (AssumeMP && !UseSerialGC) {
2152 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2153 warning("If the number of processors is expected to increase from one, then"
2154 " you should configure the number of parallel GC threads appropriately"
2155 " using -XX:ParallelGCThreads=N");
2156 }
2157 }
2158 if (MinHeapFreeRatio == 100) {
2159 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2160 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2161 }
2162
2163 if (!ClassUnloading) {
2164 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2165 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
2166 }
2167 #endif // INCLUDE_ALL_GCS
2168 }
2169
2170 julong Arguments::limit_by_allocatable_memory(julong limit) {
2171 julong max_allocatable;
2172 julong result = limit;
2173 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2174 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2175 }
2176 return result;
2177 }
2178
2179 // Use static initialization to get the default before parsing
2180 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2181
2182 void Arguments::set_heap_size() {
2183 const julong phys_mem =
2184 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2185 : (julong)MaxRAM;
2186
2187 // If the maximum heap size has not been set with -Xmx,
2188 // then set it as fraction of the size of physical memory,
2189 // respecting the maximum and minimum sizes of the heap.
2190 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2191 julong reasonable_max = phys_mem / MaxRAMFraction;
2192
2193 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2194 // Small physical memory, so use a minimum fraction of it for the heap
2195 reasonable_max = phys_mem / MinRAMFraction;
2196 } else {
2197 // Not-small physical memory, so require a heap at least
2198 // as large as MaxHeapSize
2199 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2200 }
2201 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2202 // Limit the heap size to ErgoHeapSizeLimit
2203 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2204 }
2205 if (UseCompressedOops) {
2206 // Limit the heap size to the maximum possible when using compressed oops
2207 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2208
2209 // HeapBaseMinAddress can be greater than default but not less than.
2210 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2211 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2212 // matches compressed oops printing flags
2213 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2214 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2215 DefaultHeapBaseMinAddress,
2216 DefaultHeapBaseMinAddress/G,
2217 HeapBaseMinAddress);
2218 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2219 }
2220 }
2221
2222 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2223 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2224 // but it should be not less than default MaxHeapSize.
2225 max_coop_heap -= HeapBaseMinAddress;
2226 }
2227 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2228 }
2229 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2230
2231 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2232 // An initial heap size was specified on the command line,
2233 // so be sure that the maximum size is consistent. Done
2234 // after call to limit_by_allocatable_memory because that
2235 // method might reduce the allocation size.
2236 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2237 }
2238
2239 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2240 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2241 }
2242
2243 // If the minimum or initial heap_size have not been set or requested to be set
2244 // ergonomically, set them accordingly.
2245 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2246 julong reasonable_minimum = (julong)(OldSize + NewSize);
2247
2248 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2249
2250 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2251
2252 if (InitialHeapSize == 0) {
2253 julong reasonable_initial = phys_mem / InitialRAMFraction;
2254
2255 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2256 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2257
2258 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2259
2260 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2261 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2262 }
2263 // If the minimum heap size has not been set (via -Xms),
2264 // synchronize with InitialHeapSize to avoid errors with the default value.
2265 if (min_heap_size() == 0) {
2266 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2267 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2268 }
2269 }
2270 }
2271
2272 // This option inspects the machine and attempts to set various
2273 // parameters to be optimal for long-running, memory allocation
2274 // intensive jobs. It is intended for machines with large
2275 // amounts of cpu and memory.
2276 jint Arguments::set_aggressive_heap_flags() {
2277 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2278 // VM, but we may not be able to represent the total physical memory
2279 // available (like having 8gb of memory on a box but using a 32bit VM).
2280 // Thus, we need to make sure we're using a julong for intermediate
2281 // calculations.
2282 julong initHeapSize;
2283 julong total_memory = os::physical_memory();
2284
2285 if (total_memory < (julong) 256 * M) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2288 vm_exit(1);
2289 }
2290
2291 // The heap size is half of available memory, or (at most)
2292 // all of possible memory less 160mb (leaving room for the OS
2293 // when using ISM). This is the maximum; because adaptive sizing
2294 // is turned on below, the actual space used may be smaller.
2295
2296 initHeapSize = MIN2(total_memory / (julong) 2,
2297 total_memory - (julong) 160 * M);
2298
2299 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2300
2301 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2302 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2303 return JNI_EINVAL;
2304 }
2305 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2306 return JNI_EINVAL;
2307 }
2308 // Currently the minimum size and the initial heap sizes are the same.
2309 set_min_heap_size(initHeapSize);
2310 }
2311 if (FLAG_IS_DEFAULT(NewSize)) {
2312 // Make the young generation 3/8ths of the total heap.
2313 if (FLAG_SET_CMDLINE(size_t, NewSize,
2314 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2315 return JNI_EINVAL;
2316 }
2317 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2318 return JNI_EINVAL;
2319 }
2320 }
2321
2322 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2323 FLAG_SET_DEFAULT(UseLargePages, true);
2324 #endif
2325
2326 // Increase some data structure sizes for efficiency
2327 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2328 return JNI_EINVAL;
2329 }
2330 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2331 return JNI_EINVAL;
2332 }
2333 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2334 return JNI_EINVAL;
2335 }
2336
2337 // See the OldPLABSize comment below, but replace 'after promotion'
2338 // with 'after copying'. YoungPLABSize is the size of the survivor
2339 // space per-gc-thread buffers. The default is 4kw.
2340 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2341 return JNI_EINVAL;
2342 }
2343
2344 // OldPLABSize is the size of the buffers in the old gen that
2345 // UseParallelGC uses to promote live data that doesn't fit in the
2346 // survivor spaces. At any given time, there's one for each gc thread.
2347 // The default size is 1kw. These buffers are rarely used, since the
2348 // survivor spaces are usually big enough. For specjbb, however, there
2349 // are occasions when there's lots of live data in the young gen
2350 // and we end up promoting some of it. We don't have a definite
2351 // explanation for why bumping OldPLABSize helps, but the theory
2352 // is that a bigger PLAB results in retaining something like the
2353 // original allocation order after promotion, which improves mutator
2354 // locality. A minor effect may be that larger PLABs reduce the
2355 // number of PLAB allocation events during gc. The value of 8kw
2356 // was arrived at by experimenting with specjbb.
2357 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2358 return JNI_EINVAL;
2359 }
2360
2361 // Enable parallel GC and adaptive generation sizing
2362 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2363 return JNI_EINVAL;
2364 }
2365 FLAG_SET_DEFAULT(ParallelGCThreads,
2366 Abstract_VM_Version::parallel_worker_threads());
2367
2368 // Encourage steady state memory management
2369 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2370 return JNI_EINVAL;
2371 }
2372
2373 // This appears to improve mutator locality
2374 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2375 return JNI_EINVAL;
2376 }
2377
2378 // Get around early Solaris scheduling bug
2379 // (affinity vs other jobs on system)
2380 // but disallow DR and offlining (5008695).
2381 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2382 return JNI_EINVAL;
2383 }
2384
2385 return JNI_OK;
2386 }
2387
2388 // This must be called after ergonomics.
2389 void Arguments::set_bytecode_flags() {
2390 if (!RewriteBytecodes) {
2391 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2392 }
2393 }
2394
2395 // Aggressive optimization flags -XX:+AggressiveOpts
2396 jint Arguments::set_aggressive_opts_flags() {
2397 #ifdef COMPILER2
2398 if (AggressiveUnboxing) {
2399 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2400 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2401 } else if (!EliminateAutoBox) {
2402 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2403 AggressiveUnboxing = false;
2404 }
2405 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2406 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2407 } else if (!DoEscapeAnalysis) {
2408 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2409 AggressiveUnboxing = false;
2410 }
2411 }
2412 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2413 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2414 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2415 }
2416 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2417 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2418 }
2419
2420 // Feed the cache size setting into the JDK
2421 char buffer[1024];
2422 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2423 if (!add_property(buffer)) {
2424 return JNI_ENOMEM;
2425 }
2426 }
2427 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2428 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2429 }
2430 #endif
2431
2432 if (AggressiveOpts) {
2433 // Sample flag setting code
2434 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2435 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2436 // }
2437 }
2438
2439 return JNI_OK;
2440 }
2441
2442 //===========================================================================================================
2443 // Parsing of java.compiler property
2444
2445 void Arguments::process_java_compiler_argument(const char* arg) {
2446 // For backwards compatibility, Djava.compiler=NONE or ""
2447 // causes us to switch to -Xint mode UNLESS -Xdebug
2448 // is also specified.
2449 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2450 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2451 }
2452 }
2453
2454 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2455 _sun_java_launcher = os::strdup_check_oom(launcher);
2456 }
2457
2458 bool Arguments::created_by_java_launcher() {
2459 assert(_sun_java_launcher != NULL, "property must have value");
2460 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2461 }
2462
2463 bool Arguments::sun_java_launcher_is_altjvm() {
2464 return _sun_java_launcher_is_altjvm;
2465 }
2466
2467 //===========================================================================================================
2468 // Parsing of main arguments
2469
2470 #if INCLUDE_JVMCI
2471 // Check consistency of jvmci vm argument settings.
2472 bool Arguments::check_jvmci_args_consistency() {
2473 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2474 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2475 return false;
2476 }
2477 return true;
2478 }
2479 #endif //INCLUDE_JVMCI
2480
2481 // Check consistency of GC selection
2482 bool Arguments::check_gc_consistency() {
2483 // Ensure that the user has not selected conflicting sets
2484 // of collectors.
2485 uint i = 0;
2486 if (UseSerialGC) i++;
2487 if (UseConcMarkSweepGC) i++;
2488 if (UseParallelGC || UseParallelOldGC) i++;
2489 if (UseG1GC) i++;
2490 if (i > 1) {
2491 jio_fprintf(defaultStream::error_stream(),
2492 "Conflicting collector combinations in option list; "
2493 "please refer to the release notes for the combinations "
2494 "allowed\n");
2495 return false;
2496 }
2497
2498 if (UseConcMarkSweepGC && !UseParNewGC) {
2499 jio_fprintf(defaultStream::error_stream(),
2500 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2501 return false;
2502 }
2503
2504 if (UseParNewGC && !UseConcMarkSweepGC) {
2505 jio_fprintf(defaultStream::error_stream(),
2506 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2507 return false;
2508 }
2509
2510 return true;
2511 }
2512
2513 // Check the consistency of vm_init_args
2514 bool Arguments::check_vm_args_consistency() {
2515 // Method for adding checks for flag consistency.
2516 // The intent is to warn the user of all possible conflicts,
2517 // before returning an error.
2518 // Note: Needs platform-dependent factoring.
2519 bool status = true;
2520
2521 if (TLABRefillWasteFraction == 0) {
2522 jio_fprintf(defaultStream::error_stream(),
2523 "TLABRefillWasteFraction should be a denominator, "
2524 "not " SIZE_FORMAT "\n",
2525 TLABRefillWasteFraction);
2526 status = false;
2527 }
2528
2529 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2530 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2531 }
2532
2533 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2534 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2535 }
2536
2537 if (GCTimeLimit == 100) {
2538 // Turn off gc-overhead-limit-exceeded checks
2539 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2540 }
2541
2542 status = status && check_gc_consistency();
2543
2544 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2545 // insists that we hold the requisite locks so that the iteration is
2546 // MT-safe. For the verification at start-up and shut-down, we don't
2547 // yet have a good way of acquiring and releasing these locks,
2548 // which are not visible at the CollectedHeap level. We want to
2549 // be able to acquire these locks and then do the iteration rather
2550 // than just disable the lock verification. This will be fixed under
2551 // bug 4788986.
2552 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2553 if (VerifyDuringStartup) {
2554 warning("Heap verification at start-up disabled "
2555 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2556 VerifyDuringStartup = false; // Disable verification at start-up
2557 }
2558
2559 if (VerifyBeforeExit) {
2560 warning("Heap verification at shutdown disabled "
2561 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2562 VerifyBeforeExit = false; // Disable verification at shutdown
2563 }
2564 }
2565
2566 if (PrintNMTStatistics) {
2567 #if INCLUDE_NMT
2568 if (MemTracker::tracking_level() == NMT_off) {
2569 #endif // INCLUDE_NMT
2570 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2571 PrintNMTStatistics = false;
2572 #if INCLUDE_NMT
2573 }
2574 #endif
2575 }
2576 #if INCLUDE_JVMCI
2577
2578 status = status && check_jvmci_args_consistency();
2579
2580 if (EnableJVMCI) {
2581 if (!ScavengeRootsInCode) {
2582 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2583 ScavengeRootsInCode = 1;
2584 }
2585 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2586 TypeProfileLevel = 0;
2587 }
2588 if (UseJVMCICompiler) {
2589 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2590 TypeProfileWidth = 8;
2591 }
2592 }
2593 }
2594 #endif
2595
2596 // Check lower bounds of the code cache
2597 // Template Interpreter code is approximately 3X larger in debug builds.
2598 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2599 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2600 jio_fprintf(defaultStream::error_stream(),
2601 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2602 os::vm_page_size()/K);
2603 status = false;
2604 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2605 jio_fprintf(defaultStream::error_stream(),
2606 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2607 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2608 status = false;
2609 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2610 jio_fprintf(defaultStream::error_stream(),
2611 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2612 min_code_cache_size/K);
2613 status = false;
2614 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2615 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2616 jio_fprintf(defaultStream::error_stream(),
2617 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2618 CODE_CACHE_SIZE_LIMIT/M);
2619 status = false;
2620 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2621 jio_fprintf(defaultStream::error_stream(),
2622 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2623 min_code_cache_size/K);
2624 status = false;
2625 }
2626
2627 #ifdef _LP64
2628 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2629 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2630 }
2631 #endif
2632
2633 #ifndef SUPPORT_RESERVED_STACK_AREA
2634 if (StackReservedPages != 0) {
2635 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2636 warning("Reserved Stack Area not supported on this platform");
2637 }
2638 #endif
2639
2640 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2641 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2642 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2643 }
2644 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2645 }
2646 if (UseCompiler && is_interpreter_only()) {
2647 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2648 warning("UseCompiler disabled due to -Xint.");
2649 }
2650 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2651 }
2652 return status;
2653 }
2654
2655 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2656 const char* option_type) {
2657 if (ignore) return false;
2658
2659 const char* spacer = " ";
2660 if (option_type == NULL) {
2661 option_type = ++spacer; // Set both to the empty string.
2662 }
2663
2664 if (os::obsolete_option(option)) {
2665 jio_fprintf(defaultStream::error_stream(),
2666 "Obsolete %s%soption: %s\n", option_type, spacer,
2667 option->optionString);
2668 return false;
2669 } else {
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Unrecognized %s%soption: %s\n", option_type, spacer,
2672 option->optionString);
2673 return true;
2674 }
2675 }
2676
2677 static const char* user_assertion_options[] = {
2678 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2679 };
2680
2681 static const char* system_assertion_options[] = {
2682 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2683 };
2684
2685 bool Arguments::parse_uintx(const char* value,
2686 uintx* uintx_arg,
2687 uintx min_size) {
2688
2689 // Check the sign first since atomull() parses only unsigned values.
2690 bool value_is_positive = !(*value == '-');
2691
2692 if (value_is_positive) {
2693 julong n;
2694 bool good_return = atomull(value, &n);
2695 if (good_return) {
2696 bool above_minimum = n >= min_size;
2697 bool value_is_too_large = n > max_uintx;
2698
2699 if (above_minimum && !value_is_too_large) {
2700 *uintx_arg = n;
2701 return true;
2702 }
2703 }
2704 }
2705 return false;
2706 }
2707
2708 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2709 julong* long_arg,
2710 julong min_size) {
2711 if (!atomull(s, long_arg)) return arg_unreadable;
2712 return check_memory_size(*long_arg, min_size);
2713 }
2714
2715 // Parse JavaVMInitArgs structure
2716
2717 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2718 const JavaVMInitArgs *java_options_args,
2719 const JavaVMInitArgs *cmd_line_args) {
2720 // For components of the system classpath.
2721 ArgumentBootClassPath bcp(Arguments::get_sysclasspath());
2722 bool bcp_assembly_required = false;
2723
2724 // Save default settings for some mode flags
2725 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2726 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2727 Arguments::_ClipInlining = ClipInlining;
2728 Arguments::_BackgroundCompilation = BackgroundCompilation;
2729 if (TieredCompilation) {
2730 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2731 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2732 }
2733
2734 // Setup flags for mixed which is the default
2735 set_mode_flags(_mixed);
2736
2737 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2738 // variable (if present).
2739 jint result = parse_each_vm_init_arg(
2740 java_tool_options_args, &bcp, &bcp_assembly_required, Flag::ENVIRON_VAR);
2741 if (result != JNI_OK) {
2742 return result;
2743 }
2744
2745 // Parse args structure generated from the command line flags.
2746 result = parse_each_vm_init_arg(cmd_line_args, &bcp, &bcp_assembly_required,
2747 Flag::COMMAND_LINE);
2748 if (result != JNI_OK) {
2749 return result;
2750 }
2751
2752 // Parse args structure generated from the _JAVA_OPTIONS environment
2753 // variable (if present) (mimics classic VM)
2754 result = parse_each_vm_init_arg(
2755 java_options_args, &bcp, &bcp_assembly_required, Flag::ENVIRON_VAR);
2756 if (result != JNI_OK) {
2757 return result;
2758 }
2759
2760 // Do final processing now that all arguments have been parsed
2761 result = finalize_vm_init_args(&bcp, bcp_assembly_required);
2762 if (result != JNI_OK) {
2763 return result;
2764 }
2765
2766 return JNI_OK;
2767 }
2768
2769 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2770 // represents a valid JDWP agent. is_path==true denotes that we
2771 // are dealing with -agentpath (case where name is a path), otherwise with
2772 // -agentlib
2773 bool valid_jdwp_agent(char *name, bool is_path) {
2774 char *_name;
2775 const char *_jdwp = "jdwp";
2776 size_t _len_jdwp, _len_prefix;
2777
2778 if (is_path) {
2779 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2780 return false;
2781 }
2782
2783 _name++; // skip past last path separator
2784 _len_prefix = strlen(JNI_LIB_PREFIX);
2785
2786 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2787 return false;
2788 }
2789
2790 _name += _len_prefix;
2791 _len_jdwp = strlen(_jdwp);
2792
2793 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2794 _name += _len_jdwp;
2795 }
2796 else {
2797 return false;
2798 }
2799
2800 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2801 return false;
2802 }
2803
2804 return true;
2805 }
2806
2807 if (strcmp(name, _jdwp) == 0) {
2808 return true;
2809 }
2810
2811 return false;
2812 }
2813
2814 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2815 ArgumentBootClassPath* bcp_p,
2816 bool* bcp_assembly_required_p,
2817 Flag::Flags origin) {
2818 // For match_option to return remaining or value part of option string
2819 const char* tail;
2820
2821 // iterate over arguments
2822 for (int index = 0; index < args->nOptions; index++) {
2823 bool is_absolute_path = false; // for -agentpath vs -agentlib
2824
2825 const JavaVMOption* option = args->options + index;
2826
2827 if (!match_option(option, "-Djava.class.path", &tail) &&
2828 !match_option(option, "-Dsun.java.command", &tail) &&
2829 !match_option(option, "-Dsun.java.launcher", &tail)) {
2830
2831 // add all jvm options to the jvm_args string. This string
2832 // is used later to set the java.vm.args PerfData string constant.
2833 // the -Djava.class.path and the -Dsun.java.command options are
2834 // omitted from jvm_args string as each have their own PerfData
2835 // string constant object.
2836 build_jvm_args(option->optionString);
2837 }
2838
2839 // -verbose:[class/gc/jni]
2840 if (match_option(option, "-verbose", &tail)) {
2841 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2842 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload));
2843 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload));
2844 } else if (!strcmp(tail, ":gc")) {
2845 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2846 } else if (!strcmp(tail, ":jni")) {
2847 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2848 return JNI_EINVAL;
2849 }
2850 }
2851 // -da / -ea / -disableassertions / -enableassertions
2852 // These accept an optional class/package name separated by a colon, e.g.,
2853 // -da:java.lang.Thread.
2854 } else if (match_option(option, user_assertion_options, &tail, true)) {
2855 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2856 if (*tail == '\0') {
2857 JavaAssertions::setUserClassDefault(enable);
2858 } else {
2859 assert(*tail == ':', "bogus match by match_option()");
2860 JavaAssertions::addOption(tail + 1, enable);
2861 }
2862 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2863 } else if (match_option(option, system_assertion_options, &tail, false)) {
2864 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2865 JavaAssertions::setSystemClassDefault(enable);
2866 // -bootclasspath:
2867 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2868 jio_fprintf(defaultStream::output_stream(),
2869 "-Xbootclasspath is no longer a supported option.\n");
2870 return JNI_EINVAL;
2871 // -bootclasspath/a:
2872 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2873 bcp_p->add_suffix(tail);
2874 *bcp_assembly_required_p = true;
2875 // -bootclasspath/p:
2876 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2877 jio_fprintf(defaultStream::output_stream(),
2878 "-Xbootclasspath/p is no longer a supported option.\n");
2879 return JNI_EINVAL;
2880 // -Xrun
2881 } else if (match_option(option, "-Xrun", &tail)) {
2882 if (tail != NULL) {
2883 const char* pos = strchr(tail, ':');
2884 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2885 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2886 name[len] = '\0';
2887
2888 char *options = NULL;
2889 if(pos != NULL) {
2890 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2891 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2892 }
2893 #if !INCLUDE_JVMTI
2894 if (strcmp(name, "jdwp") == 0) {
2895 jio_fprintf(defaultStream::error_stream(),
2896 "Debugging agents are not supported in this VM\n");
2897 return JNI_ERR;
2898 }
2899 #endif // !INCLUDE_JVMTI
2900 add_init_library(name, options);
2901 }
2902 // -agentlib and -agentpath
2903 } else if (match_option(option, "-agentlib:", &tail) ||
2904 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2905 if(tail != NULL) {
2906 const char* pos = strchr(tail, '=');
2907 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2908 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2909 name[len] = '\0';
2910
2911 char *options = NULL;
2912 if(pos != NULL) {
2913 options = os::strdup_check_oom(pos + 1, mtArguments);
2914 }
2915 #if !INCLUDE_JVMTI
2916 if (valid_jdwp_agent(name, is_absolute_path)) {
2917 jio_fprintf(defaultStream::error_stream(),
2918 "Debugging agents are not supported in this VM\n");
2919 return JNI_ERR;
2920 }
2921 #endif // !INCLUDE_JVMTI
2922 add_init_agent(name, options, is_absolute_path);
2923 }
2924 // -javaagent
2925 } else if (match_option(option, "-javaagent:", &tail)) {
2926 #if !INCLUDE_JVMTI
2927 jio_fprintf(defaultStream::error_stream(),
2928 "Instrumentation agents are not supported in this VM\n");
2929 return JNI_ERR;
2930 #else
2931 if (tail != NULL) {
2932 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2933 add_init_agent("instrument", options, false);
2934 // java agents need module java.instrument. Also -addmods ALL-SYSTEM because
2935 // the java agent is in the unmamed module of the application class loader
2936 if (!Arguments::append_to_addmods_property("java.instrument,ALL-SYSTEM")) {
2937 return JNI_ENOMEM;
2938 }
2939 }
2940 #endif // !INCLUDE_JVMTI
2941 // -Xnoclassgc
2942 } else if (match_option(option, "-Xnoclassgc")) {
2943 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 // -Xconcgc
2947 } else if (match_option(option, "-Xconcgc")) {
2948 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 // -Xnoconcgc
2952 } else if (match_option(option, "-Xnoconcgc")) {
2953 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2954 return JNI_EINVAL;
2955 }
2956 // -Xbatch
2957 } else if (match_option(option, "-Xbatch")) {
2958 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 // -Xmn for compatibility with other JVM vendors
2962 } else if (match_option(option, "-Xmn", &tail)) {
2963 julong long_initial_young_size = 0;
2964 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2965 if (errcode != arg_in_range) {
2966 jio_fprintf(defaultStream::error_stream(),
2967 "Invalid initial young generation size: %s\n", option->optionString);
2968 describe_range_error(errcode);
2969 return JNI_EINVAL;
2970 }
2971 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2972 return JNI_EINVAL;
2973 }
2974 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2975 return JNI_EINVAL;
2976 }
2977 // -Xms
2978 } else if (match_option(option, "-Xms", &tail)) {
2979 julong long_initial_heap_size = 0;
2980 // an initial heap size of 0 means automatically determine
2981 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2982 if (errcode != arg_in_range) {
2983 jio_fprintf(defaultStream::error_stream(),
2984 "Invalid initial heap size: %s\n", option->optionString);
2985 describe_range_error(errcode);
2986 return JNI_EINVAL;
2987 }
2988 set_min_heap_size((size_t)long_initial_heap_size);
2989 // Currently the minimum size and the initial heap sizes are the same.
2990 // Can be overridden with -XX:InitialHeapSize.
2991 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2992 return JNI_EINVAL;
2993 }
2994 // -Xmx
2995 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2996 julong long_max_heap_size = 0;
2997 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2998 if (errcode != arg_in_range) {
2999 jio_fprintf(defaultStream::error_stream(),
3000 "Invalid maximum heap size: %s\n", option->optionString);
3001 describe_range_error(errcode);
3002 return JNI_EINVAL;
3003 }
3004 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
3005 return JNI_EINVAL;
3006 }
3007 // Xmaxf
3008 } else if (match_option(option, "-Xmaxf", &tail)) {
3009 char* err;
3010 int maxf = (int)(strtod(tail, &err) * 100);
3011 if (*err != '\0' || *tail == '\0') {
3012 jio_fprintf(defaultStream::error_stream(),
3013 "Bad max heap free percentage size: %s\n",
3014 option->optionString);
3015 return JNI_EINVAL;
3016 } else {
3017 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3018 return JNI_EINVAL;
3019 }
3020 }
3021 // Xminf
3022 } else if (match_option(option, "-Xminf", &tail)) {
3023 char* err;
3024 int minf = (int)(strtod(tail, &err) * 100);
3025 if (*err != '\0' || *tail == '\0') {
3026 jio_fprintf(defaultStream::error_stream(),
3027 "Bad min heap free percentage size: %s\n",
3028 option->optionString);
3029 return JNI_EINVAL;
3030 } else {
3031 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3032 return JNI_EINVAL;
3033 }
3034 }
3035 // -Xss
3036 } else if (match_option(option, "-Xss", &tail)) {
3037 julong long_ThreadStackSize = 0;
3038 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3039 if (errcode != arg_in_range) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Invalid thread stack size: %s\n", option->optionString);
3042 describe_range_error(errcode);
3043 return JNI_EINVAL;
3044 }
3045 // Internally track ThreadStackSize in units of 1024 bytes.
3046 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3047 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3051 } else if (match_option(option, "-Xoss", &tail) ||
3052 match_option(option, "-Xsqnopause") ||
3053 match_option(option, "-Xoptimize") ||
3054 match_option(option, "-Xboundthreads") ||
3055 match_option(option, "-Xusealtsigs")) {
3056 // All these options are deprecated in JDK 9 and will be removed in a future release
3057 char version[256];
3058 JDK_Version::jdk(9).to_string(version, sizeof(version));
3059 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3060 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3061 julong long_CodeCacheExpansionSize = 0;
3062 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3063 if (errcode != arg_in_range) {
3064 jio_fprintf(defaultStream::error_stream(),
3065 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3066 os::vm_page_size()/K);
3067 return JNI_EINVAL;
3068 }
3069 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3070 return JNI_EINVAL;
3071 }
3072 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3073 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3074 julong long_ReservedCodeCacheSize = 0;
3075
3076 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3077 if (errcode != arg_in_range) {
3078 jio_fprintf(defaultStream::error_stream(),
3079 "Invalid maximum code cache size: %s.\n", option->optionString);
3080 return JNI_EINVAL;
3081 }
3082 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3083 return JNI_EINVAL;
3084 }
3085 // -XX:NonNMethodCodeHeapSize=
3086 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3087 julong long_NonNMethodCodeHeapSize = 0;
3088
3089 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3090 if (errcode != arg_in_range) {
3091 jio_fprintf(defaultStream::error_stream(),
3092 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3093 return JNI_EINVAL;
3094 }
3095 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3096 return JNI_EINVAL;
3097 }
3098 // -XX:ProfiledCodeHeapSize=
3099 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3100 julong long_ProfiledCodeHeapSize = 0;
3101
3102 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3103 if (errcode != arg_in_range) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3106 return JNI_EINVAL;
3107 }
3108 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3109 return JNI_EINVAL;
3110 }
3111 // -XX:NonProfiledCodeHeapSizee=
3112 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3113 julong long_NonProfiledCodeHeapSize = 0;
3114
3115 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3116 if (errcode != arg_in_range) {
3117 jio_fprintf(defaultStream::error_stream(),
3118 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3119 return JNI_EINVAL;
3120 }
3121 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 // -green
3125 } else if (match_option(option, "-green")) {
3126 jio_fprintf(defaultStream::error_stream(),
3127 "Green threads support not available\n");
3128 return JNI_EINVAL;
3129 // -native
3130 } else if (match_option(option, "-native")) {
3131 // HotSpot always uses native threads, ignore silently for compatibility
3132 // -Xrs
3133 } else if (match_option(option, "-Xrs")) {
3134 // Classic/EVM option, new functionality
3135 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 // -Xprof
3139 } else if (match_option(option, "-Xprof")) {
3140 #if INCLUDE_FPROF
3141 _has_profile = true;
3142 #else // INCLUDE_FPROF
3143 jio_fprintf(defaultStream::error_stream(),
3144 "Flat profiling is not supported in this VM.\n");
3145 return JNI_ERR;
3146 #endif // INCLUDE_FPROF
3147 // -Xconcurrentio
3148 } else if (match_option(option, "-Xconcurrentio")) {
3149 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3156 return JNI_EINVAL;
3157 }
3158 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3159 return JNI_EINVAL;
3160 }
3161 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3162 return JNI_EINVAL;
3163 }
3164
3165 // -Xinternalversion
3166 } else if (match_option(option, "-Xinternalversion")) {
3167 jio_fprintf(defaultStream::output_stream(), "%s\n",
3168 VM_Version::internal_vm_info_string());
3169 vm_exit(0);
3170 #ifndef PRODUCT
3171 // -Xprintflags
3172 } else if (match_option(option, "-Xprintflags")) {
3173 CommandLineFlags::printFlags(tty, false);
3174 vm_exit(0);
3175 #endif
3176 // -D
3177 } else if (match_option(option, "-D", &tail)) {
3178 const char* value;
3179 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3180 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3181 // abort if -Djava.endorsed.dirs is set
3182 jio_fprintf(defaultStream::output_stream(),
3183 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3184 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3185 return JNI_EINVAL;
3186 }
3187 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3188 *value != '\0' && strcmp(value, "\"\"") != 0) {
3189 // abort if -Djava.ext.dirs is set
3190 jio_fprintf(defaultStream::output_stream(),
3191 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3192 return JNI_EINVAL;
3193 }
3194
3195 if (!add_property(tail)) {
3196 return JNI_ENOMEM;
3197 }
3198 // Out of the box management support
3199 if (match_option(option, "-Dcom.sun.management", &tail)) {
3200 #if INCLUDE_MANAGEMENT
3201 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3202 return JNI_EINVAL;
3203 }
3204 // management agent in module java.management
3205 if (!Arguments::append_to_addmods_property("java.management")) {
3206 return JNI_ENOMEM;
3207 }
3208 #else
3209 jio_fprintf(defaultStream::output_stream(),
3210 "-Dcom.sun.management is not supported in this VM.\n");
3211 return JNI_ERR;
3212 #endif
3213 }
3214 if (match_option(option, "-Djdk.launcher.patch.0=", &tail)) {
3215 // -Xpatch
3216 int dir_count;
3217 char** patch_dirs = os::split_path(tail, &dir_count);
3218 if (patch_dirs == NULL) {
3219 jio_fprintf(defaultStream::output_stream(),
3220 "Bad value for -Xpatch.\n");
3221 return JNI_ERR;
3222 }
3223 set_patch_dirs(patch_dirs);
3224 set_patch_dirs_count(dir_count);
3225
3226 // Create a path for each patch dir consisting of dir/java.base.
3227 char file_sep = os::file_separator()[0];
3228 for (int x = 0; x < dir_count; x++) {
3229 // Really shouldn't be NULL, but check can't hurt
3230 if (patch_dirs[x] != NULL) {
3231 size_t len = strlen(patch_dirs[x]);
3232 if (len != 0) { // Ignore empty strings.
3233 len += 11; // file_sep + "java.base" + null terminator.
3234 char* dir = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3235 jio_snprintf(dir, len, "%s%cjava.base", patch_dirs[x], file_sep);
3236
3237 // See if Xpatch module path exists.
3238 struct stat st;
3239 if ((os::stat(dir, &st) == 0)) {
3240 bcp_p->add_prefix(dir);
3241 *bcp_assembly_required_p = true;
3242 }
3243 FREE_C_HEAP_ARRAY(char, dir);
3244 }
3245 }
3246 }
3247 }
3248 // -Xint
3249 } else if (match_option(option, "-Xint")) {
3250 set_mode_flags(_int);
3251 // -Xmixed
3252 } else if (match_option(option, "-Xmixed")) {
3253 set_mode_flags(_mixed);
3254 // -Xcomp
3255 } else if (match_option(option, "-Xcomp")) {
3256 // for testing the compiler; turn off all flags that inhibit compilation
3257 set_mode_flags(_comp);
3258 // -Xshare:dump
3259 } else if (match_option(option, "-Xshare:dump")) {
3260 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3261 return JNI_EINVAL;
3262 }
3263 set_mode_flags(_int); // Prevent compilation, which creates objects
3264 // -Xshare:on
3265 } else if (match_option(option, "-Xshare:on")) {
3266 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3267 return JNI_EINVAL;
3268 }
3269 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3270 return JNI_EINVAL;
3271 }
3272 // -Xshare:auto
3273 } else if (match_option(option, "-Xshare:auto")) {
3274 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3275 return JNI_EINVAL;
3276 }
3277 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3278 return JNI_EINVAL;
3279 }
3280 // -Xshare:off
3281 } else if (match_option(option, "-Xshare:off")) {
3282 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3283 return JNI_EINVAL;
3284 }
3285 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3286 return JNI_EINVAL;
3287 }
3288 // -Xverify
3289 } else if (match_option(option, "-Xverify", &tail)) {
3290 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3291 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3292 return JNI_EINVAL;
3293 }
3294 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3295 return JNI_EINVAL;
3296 }
3297 } else if (strcmp(tail, ":remote") == 0) {
3298 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3299 return JNI_EINVAL;
3300 }
3301 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3302 return JNI_EINVAL;
3303 }
3304 } else if (strcmp(tail, ":none") == 0) {
3305 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3306 return JNI_EINVAL;
3307 }
3308 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3309 return JNI_EINVAL;
3310 }
3311 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3312 return JNI_EINVAL;
3313 }
3314 // -Xdebug
3315 } else if (match_option(option, "-Xdebug")) {
3316 // note this flag has been used, then ignore
3317 set_xdebug_mode(true);
3318 // -Xnoagent
3319 } else if (match_option(option, "-Xnoagent")) {
3320 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3321 } else if (match_option(option, "-Xloggc:", &tail)) {
3322 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3323 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3324 _gc_log_filename = os::strdup_check_oom(tail);
3325 } else if (match_option(option, "-Xlog", &tail)) {
3326 bool ret = false;
3327 if (strcmp(tail, ":help") == 0) {
3328 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3329 vm_exit(0);
3330 } else if (strcmp(tail, ":disable") == 0) {
3331 LogConfiguration::disable_logging();
3332 ret = true;
3333 } else if (*tail == '\0') {
3334 ret = LogConfiguration::parse_command_line_arguments();
3335 assert(ret, "-Xlog without arguments should never fail to parse");
3336 } else if (*tail == ':') {
3337 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3338 }
3339 if (ret == false) {
3340 jio_fprintf(defaultStream::error_stream(),
3341 "Invalid -Xlog option '-Xlog%s'\n",
3342 tail);
3343 return JNI_EINVAL;
3344 }
3345 // JNI hooks
3346 } else if (match_option(option, "-Xcheck", &tail)) {
3347 if (!strcmp(tail, ":jni")) {
3348 #if !INCLUDE_JNI_CHECK
3349 warning("JNI CHECKING is not supported in this VM");
3350 #else
3351 CheckJNICalls = true;
3352 #endif // INCLUDE_JNI_CHECK
3353 } else if (is_bad_option(option, args->ignoreUnrecognized,
3354 "check")) {
3355 return JNI_EINVAL;
3356 }
3357 } else if (match_option(option, "vfprintf")) {
3358 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3359 } else if (match_option(option, "exit")) {
3360 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3361 } else if (match_option(option, "abort")) {
3362 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3363 // -XX:+AggressiveHeap
3364 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3365 jint result = set_aggressive_heap_flags();
3366 if (result != JNI_OK) {
3367 return result;
3368 }
3369 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3370 // and the last option wins.
3371 } else if (match_option(option, "-XX:+NeverTenure")) {
3372 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3373 return JNI_EINVAL;
3374 }
3375 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3376 return JNI_EINVAL;
3377 }
3378 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3379 return JNI_EINVAL;
3380 }
3381 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3382 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3383 return JNI_EINVAL;
3384 }
3385 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3386 return JNI_EINVAL;
3387 }
3388 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3389 return JNI_EINVAL;
3390 }
3391 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3392 uintx max_tenuring_thresh = 0;
3393 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3394 jio_fprintf(defaultStream::error_stream(),
3395 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3396 return JNI_EINVAL;
3397 }
3398
3399 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3400 return JNI_EINVAL;
3401 }
3402
3403 if (MaxTenuringThreshold == 0) {
3404 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3405 return JNI_EINVAL;
3406 }
3407 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3408 return JNI_EINVAL;
3409 }
3410 } else {
3411 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3412 return JNI_EINVAL;
3413 }
3414 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3415 return JNI_EINVAL;
3416 }
3417 }
3418 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3419 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3420 return JNI_EINVAL;
3421 }
3422 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3423 return JNI_EINVAL;
3424 }
3425 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3426 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3427 return JNI_EINVAL;
3428 }
3429 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3430 return JNI_EINVAL;
3431 }
3432 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3433 #if defined(DTRACE_ENABLED)
3434 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3435 return JNI_EINVAL;
3436 }
3437 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3438 return JNI_EINVAL;
3439 }
3440 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3441 return JNI_EINVAL;
3442 }
3443 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3444 return JNI_EINVAL;
3445 }
3446 #else // defined(DTRACE_ENABLED)
3447 jio_fprintf(defaultStream::error_stream(),
3448 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3449 return JNI_EINVAL;
3450 #endif // defined(DTRACE_ENABLED)
3451 #ifdef ASSERT
3452 } else if (match_option(option, "-XX:+FullGCALot")) {
3453 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3454 return JNI_EINVAL;
3455 }
3456 // disable scavenge before parallel mark-compact
3457 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3458 return JNI_EINVAL;
3459 }
3460 #endif
3461 #if !INCLUDE_MANAGEMENT
3462 } else if (match_option(option, "-XX:+ManagementServer")) {
3463 jio_fprintf(defaultStream::error_stream(),
3464 "ManagementServer is not supported in this VM.\n");
3465 return JNI_ERR;
3466 #endif // INCLUDE_MANAGEMENT
3467 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3468 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3469 // already been handled
3470 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3471 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3472 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3473 return JNI_EINVAL;
3474 }
3475 }
3476 // Unknown option
3477 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3478 return JNI_ERR;
3479 }
3480 }
3481
3482 // PrintSharedArchiveAndExit will turn on
3483 // -Xshare:on
3484 // -Xlog:classpath=info
3485 if (PrintSharedArchiveAndExit) {
3486 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3487 return JNI_EINVAL;
3488 }
3489 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3490 return JNI_EINVAL;
3491 }
3492 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classpath));
3493 }
3494
3495 // Change the default value for flags which have different default values
3496 // when working with older JDKs.
3497 #ifdef LINUX
3498 if (JDK_Version::current().compare_major(6) <= 0 &&
3499 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3500 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3501 }
3502 #endif // LINUX
3503 fix_appclasspath();
3504 return JNI_OK;
3505 }
3506
3507 // Set property jdk.boot.class.path.append to the contents of the bootclasspath
3508 // that follows either the jimage file or exploded module directories. The
3509 // property will contain -Xbootclasspath/a and/or jvmti appended additions.
3510 void Arguments::set_jdkbootclasspath_append() {
3511 char *sysclasspath = get_sysclasspath();
3512 assert(sysclasspath != NULL, "NULL sysclasspath");
3513 int bcp_a_idx = bootclassloader_append_index();
3514 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) {
3515 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx);
3516 }
3517 }
3518
3519 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3520 //
3521 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3522 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3523 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3524 // path is treated as the current directory.
3525 //
3526 // This causes problems with CDS, which requires that all directories specified in the classpath
3527 // must be empty. In most cases, applications do NOT want to load classes from the current
3528 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3529 // scripts compatible with CDS.
3530 void Arguments::fix_appclasspath() {
3531 if (IgnoreEmptyClassPaths) {
3532 const char separator = *os::path_separator();
3533 const char* src = _java_class_path->value();
3534
3535 // skip over all the leading empty paths
3536 while (*src == separator) {
3537 src ++;
3538 }
3539
3540 char* copy = os::strdup_check_oom(src, mtArguments);
3541
3542 // trim all trailing empty paths
3543 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3544 *tail = '\0';
3545 }
3546
3547 char from[3] = {separator, separator, '\0'};
3548 char to [2] = {separator, '\0'};
3549 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3550 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3551 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3552 }
3553
3554 _java_class_path->set_writeable_value(copy);
3555 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3556 }
3557 }
3558
3559 static bool has_jar_files(const char* directory) {
3560 DIR* dir = os::opendir(directory);
3561 if (dir == NULL) return false;
3562
3563 struct dirent *entry;
3564 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3565 bool hasJarFile = false;
3566 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3567 const char* name = entry->d_name;
3568 const char* ext = name + strlen(name) - 4;
3569 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3570 }
3571 FREE_C_HEAP_ARRAY(char, dbuf);
3572 os::closedir(dir);
3573 return hasJarFile ;
3574 }
3575
3576 static int check_non_empty_dirs(const char* path) {
3577 const char separator = *os::path_separator();
3578 const char* const end = path + strlen(path);
3579 int nonEmptyDirs = 0;
3580 while (path < end) {
3581 const char* tmp_end = strchr(path, separator);
3582 if (tmp_end == NULL) {
3583 if (has_jar_files(path)) {
3584 nonEmptyDirs++;
3585 jio_fprintf(defaultStream::output_stream(),
3586 "Non-empty directory: %s\n", path);
3587 }
3588 path = end;
3589 } else {
3590 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3591 memcpy(dirpath, path, tmp_end - path);
3592 dirpath[tmp_end - path] = '\0';
3593 if (has_jar_files(dirpath)) {
3594 nonEmptyDirs++;
3595 jio_fprintf(defaultStream::output_stream(),
3596 "Non-empty directory: %s\n", dirpath);
3597 }
3598 FREE_C_HEAP_ARRAY(char, dirpath);
3599 path = tmp_end + 1;
3600 }
3601 }
3602 return nonEmptyDirs;
3603 }
3604
3605 jint Arguments::finalize_vm_init_args(ArgumentBootClassPath* bcp_p, bool bcp_assembly_required) {
3606 // check if the default lib/endorsed directory exists; if so, error
3607 char path[JVM_MAXPATHLEN];
3608 const char* fileSep = os::file_separator();
3609 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3610
3611 if (CheckEndorsedAndExtDirs) {
3612 int nonEmptyDirs = 0;
3613 // check endorsed directory
3614 nonEmptyDirs += check_non_empty_dirs(path);
3615 // check the extension directories
3616 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3617 if (nonEmptyDirs > 0) {
3618 return JNI_ERR;
3619 }
3620 }
3621
3622 DIR* dir = os::opendir(path);
3623 if (dir != NULL) {
3624 jio_fprintf(defaultStream::output_stream(),
3625 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3626 "in modular form will be supported via the concept of upgradeable modules.\n");
3627 os::closedir(dir);
3628 return JNI_ERR;
3629 }
3630
3631 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3632 dir = os::opendir(path);
3633 if (dir != NULL) {
3634 jio_fprintf(defaultStream::output_stream(),
3635 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3636 "Use -classpath instead.\n.");
3637 os::closedir(dir);
3638 return JNI_ERR;
3639 }
3640
3641 if (bcp_assembly_required) {
3642 // Assemble the bootclasspath elements into the final path.
3643 char *combined_path = bcp_p->combined_path();
3644 Arguments::set_sysclasspath(combined_path);
3645 FREE_C_HEAP_ARRAY(char, combined_path);
3646 } else {
3647 // At this point in sysclasspath processing anything
3648 // added would be considered in the boot loader's append path.
3649 // Record this index, including +1 for the file separator character.
3650 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1);
3651 }
3652
3653 // This must be done after all arguments have been processed.
3654 // java_compiler() true means set to "NONE" or empty.
3655 if (java_compiler() && !xdebug_mode()) {
3656 // For backwards compatibility, we switch to interpreted mode if
3657 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3658 // not specified.
3659 set_mode_flags(_int);
3660 }
3661
3662 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3663 // but like -Xint, leave compilation thresholds unaffected.
3664 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3665 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3666 set_mode_flags(_int);
3667 }
3668
3669 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3670 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3671 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3672 }
3673
3674 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3675 // Don't degrade server performance for footprint
3676 if (FLAG_IS_DEFAULT(UseLargePages) &&
3677 MaxHeapSize < LargePageHeapSizeThreshold) {
3678 // No need for large granularity pages w/small heaps.
3679 // Note that large pages are enabled/disabled for both the
3680 // Java heap and the code cache.
3681 FLAG_SET_DEFAULT(UseLargePages, false);
3682 }
3683
3684 #elif defined(COMPILER2)
3685 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3686 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3687 }
3688 #endif
3689
3690 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3691 UNSUPPORTED_OPTION(ProfileInterpreter);
3692 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3693 #endif
3694
3695 #ifndef TIERED
3696 // Tiered compilation is undefined.
3697 UNSUPPORTED_OPTION(TieredCompilation);
3698 #endif
3699
3700 // If we are running in a headless jre, force java.awt.headless property
3701 // to be true unless the property has already been set.
3702 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3703 if (os::is_headless_jre()) {
3704 const char* headless = Arguments::get_property("java.awt.headless");
3705 if (headless == NULL) {
3706 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3707 if (headless_env == NULL) {
3708 if (!add_property("java.awt.headless=true")) {
3709 return JNI_ENOMEM;
3710 }
3711 } else {
3712 char buffer[256];
3713 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3714 if (!add_property(buffer)) {
3715 return JNI_ENOMEM;
3716 }
3717 }
3718 }
3719 }
3720
3721 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3722 // CMS can only be used with ParNew
3723 FLAG_SET_ERGO(bool, UseParNewGC, true);
3724 }
3725
3726 if (!check_vm_args_consistency()) {
3727 return JNI_ERR;
3728 }
3729
3730 return JNI_OK;
3731 }
3732
3733 // Helper class for controlling the lifetime of JavaVMInitArgs
3734 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3735 // deleted on the destruction of the ScopedVMInitArgs object.
3736 class ScopedVMInitArgs : public StackObj {
3737 private:
3738 JavaVMInitArgs _args;
3739 char* _container_name;
3740 bool _is_set;
3741 char* _vm_options_file_arg;
3742
3743 public:
3744 ScopedVMInitArgs(const char *container_name) {
3745 _args.version = JNI_VERSION_1_2;
3746 _args.nOptions = 0;
3747 _args.options = NULL;
3748 _args.ignoreUnrecognized = false;
3749 _container_name = (char *)container_name;
3750 _is_set = false;
3751 _vm_options_file_arg = NULL;
3752 }
3753
3754 // Populates the JavaVMInitArgs object represented by this
3755 // ScopedVMInitArgs object with the arguments in options. The
3756 // allocated memory is deleted by the destructor. If this method
3757 // returns anything other than JNI_OK, then this object is in a
3758 // partially constructed state, and should be abandoned.
3759 jint set_args(GrowableArray<JavaVMOption>* options) {
3760 _is_set = true;
3761 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3762 JavaVMOption, options->length(), mtArguments);
3763 if (options_arr == NULL) {
3764 return JNI_ENOMEM;
3765 }
3766 _args.options = options_arr;
3767
3768 for (int i = 0; i < options->length(); i++) {
3769 options_arr[i] = options->at(i);
3770 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3771 if (options_arr[i].optionString == NULL) {
3772 // Rely on the destructor to do cleanup.
3773 _args.nOptions = i;
3774 return JNI_ENOMEM;
3775 }
3776 }
3777
3778 _args.nOptions = options->length();
3779 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3780 return JNI_OK;
3781 }
3782
3783 JavaVMInitArgs* get() { return &_args; }
3784 char* container_name() { return _container_name; }
3785 bool is_set() { return _is_set; }
3786 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3787 char* vm_options_file_arg() { return _vm_options_file_arg; }
3788
3789 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3790 if (_vm_options_file_arg != NULL) {
3791 os::free(_vm_options_file_arg);
3792 }
3793 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3794 }
3795
3796 ~ScopedVMInitArgs() {
3797 if (_vm_options_file_arg != NULL) {
3798 os::free(_vm_options_file_arg);
3799 }
3800 if (_args.options == NULL) return;
3801 for (int i = 0; i < _args.nOptions; i++) {
3802 os::free(_args.options[i].optionString);
3803 }
3804 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3805 }
3806
3807 // Insert options into this option list, to replace option at
3808 // vm_options_file_pos (-XX:VMOptionsFile)
3809 jint insert(const JavaVMInitArgs* args,
3810 const JavaVMInitArgs* args_to_insert,
3811 const int vm_options_file_pos) {
3812 assert(_args.options == NULL, "shouldn't be set yet");
3813 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3814 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3815
3816 int length = args->nOptions + args_to_insert->nOptions - 1;
3817 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3818 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3819 for (int i = 0; i < args->nOptions; i++) {
3820 if (i == vm_options_file_pos) {
3821 // insert the new options starting at the same place as the
3822 // -XX:VMOptionsFile option
3823 for (int j = 0; j < args_to_insert->nOptions; j++) {
3824 options->push(args_to_insert->options[j]);
3825 }
3826 } else {
3827 options->push(args->options[i]);
3828 }
3829 }
3830 // make into options array
3831 jint result = set_args(options);
3832 delete options;
3833 return result;
3834 }
3835 };
3836
3837 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3838 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3839 }
3840
3841 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3842 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3843 }
3844
3845 jint Arguments::parse_options_environment_variable(const char* name,
3846 ScopedVMInitArgs* vm_args) {
3847 char *buffer = ::getenv(name);
3848
3849 // Don't check this environment variable if user has special privileges
3850 // (e.g. unix su command).
3851 if (buffer == NULL || os::have_special_privileges()) {
3852 return JNI_OK;
3853 }
3854
3855 if ((buffer = os::strdup(buffer)) == NULL) {
3856 return JNI_ENOMEM;
3857 }
3858
3859 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3860
3861 os::free(buffer);
3862 return retcode;
3863 }
3864
3865 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3866 // read file into buffer
3867 int fd = ::open(file_name, O_RDONLY);
3868 if (fd < 0) {
3869 jio_fprintf(defaultStream::error_stream(),
3870 "Could not open options file '%s'\n",
3871 file_name);
3872 return JNI_ERR;
3873 }
3874
3875 struct stat stbuf;
3876 int retcode = os::stat(file_name, &stbuf);
3877 if (retcode != 0) {
3878 jio_fprintf(defaultStream::error_stream(),
3879 "Could not stat options file '%s'\n",
3880 file_name);
3881 os::close(fd);
3882 return JNI_ERR;
3883 }
3884
3885 if (stbuf.st_size == 0) {
3886 // tell caller there is no option data and that is ok
3887 os::close(fd);
3888 return JNI_OK;
3889 }
3890
3891 // '+ 1' for NULL termination even with max bytes
3892 size_t bytes_alloc = stbuf.st_size + 1;
3893
3894 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3895 if (NULL == buf) {
3896 jio_fprintf(defaultStream::error_stream(),
3897 "Could not allocate read buffer for options file parse\n");
3898 os::close(fd);
3899 return JNI_ENOMEM;
3900 }
3901
3902 memset(buf, 0, bytes_alloc);
3903
3904 // Fill buffer
3905 // Use ::read() instead of os::read because os::read()
3906 // might do a thread state transition
3907 // and it is too early for that here
3908
3909 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3910 os::close(fd);
3911 if (bytes_read < 0) {
3912 FREE_C_HEAP_ARRAY(char, buf);
3913 jio_fprintf(defaultStream::error_stream(),
3914 "Could not read options file '%s'\n", file_name);
3915 return JNI_ERR;
3916 }
3917
3918 if (bytes_read == 0) {
3919 // tell caller there is no option data and that is ok
3920 FREE_C_HEAP_ARRAY(char, buf);
3921 return JNI_OK;
3922 }
3923
3924 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3925
3926 FREE_C_HEAP_ARRAY(char, buf);
3927 return retcode;
3928 }
3929
3930 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3931 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3932
3933 // some pointers to help with parsing
3934 char *buffer_end = buffer + buf_len;
3935 char *opt_hd = buffer;
3936 char *wrt = buffer;
3937 char *rd = buffer;
3938
3939 // parse all options
3940 while (rd < buffer_end) {
3941 // skip leading white space from the input string
3942 while (rd < buffer_end && isspace(*rd)) {
3943 rd++;
3944 }
3945
3946 if (rd >= buffer_end) {
3947 break;
3948 }
3949
3950 // Remember this is where we found the head of the token.
3951 opt_hd = wrt;
3952
3953 // Tokens are strings of non white space characters separated
3954 // by one or more white spaces.
3955 while (rd < buffer_end && !isspace(*rd)) {
3956 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3957 int quote = *rd; // matching quote to look for
3958 rd++; // don't copy open quote
3959 while (rd < buffer_end && *rd != quote) {
3960 // include everything (even spaces)
3961 // up until the close quote
3962 *wrt++ = *rd++; // copy to option string
3963 }
3964
3965 if (rd < buffer_end) {
3966 rd++; // don't copy close quote
3967 } else {
3968 // did not see closing quote
3969 jio_fprintf(defaultStream::error_stream(),
3970 "Unmatched quote in %s\n", name);
3971 delete options;
3972 return JNI_ERR;
3973 }
3974 } else {
3975 *wrt++ = *rd++; // copy to option string
3976 }
3977 }
3978
3979 // steal a white space character and set it to NULL
3980 *wrt++ = '\0';
3981 // We now have a complete token
3982
3983 JavaVMOption option;
3984 option.optionString = opt_hd;
3985 option.extraInfo = NULL;
3986
3987 options->append(option); // Fill in option
3988
3989 rd++; // Advance to next character
3990 }
3991
3992 // Fill out JavaVMInitArgs structure.
3993 jint status = vm_args->set_args(options);
3994
3995 delete options;
3996 return status;
3997 }
3998
3999 void Arguments::set_shared_spaces_flags() {
4000 if (DumpSharedSpaces) {
4001 if (Arguments::patch_dirs() != NULL) {
4002 vm_exit_during_initialization(
4003 "Cannot use the following option when dumping the shared archive", "-Xpatch");
4004 }
4005
4006 if (RequireSharedSpaces) {
4007 warning("Cannot dump shared archive while using shared archive");
4008 }
4009 UseSharedSpaces = false;
4010 #ifdef _LP64
4011 if (!UseCompressedOops || !UseCompressedClassPointers) {
4012 vm_exit_during_initialization(
4013 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4014 }
4015 } else {
4016 if (!UseCompressedOops || !UseCompressedClassPointers) {
4017 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4018 }
4019 #endif
4020 }
4021 }
4022
4023 // Sharing support
4024 // Construct the path to the archive
4025 static char* get_shared_archive_path() {
4026 char *shared_archive_path;
4027 if (SharedArchiveFile == NULL) {
4028 char jvm_path[JVM_MAXPATHLEN];
4029 os::jvm_path(jvm_path, sizeof(jvm_path));
4030 char *end = strrchr(jvm_path, *os::file_separator());
4031 if (end != NULL) *end = '\0';
4032 size_t jvm_path_len = strlen(jvm_path);
4033 size_t file_sep_len = strlen(os::file_separator());
4034 const size_t len = jvm_path_len + file_sep_len + 20;
4035 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4036 if (shared_archive_path != NULL) {
4037 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4038 jvm_path, os::file_separator());
4039 }
4040 } else {
4041 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4042 }
4043 return shared_archive_path;
4044 }
4045
4046 #ifndef PRODUCT
4047 // Determine whether LogVMOutput should be implicitly turned on.
4048 static bool use_vm_log() {
4049 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4050 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4051 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4052 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4053 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4054 return true;
4055 }
4056
4057 #ifdef COMPILER1
4058 if (PrintC1Statistics) {
4059 return true;
4060 }
4061 #endif // COMPILER1
4062
4063 #ifdef COMPILER2
4064 if (PrintOptoAssembly || PrintOptoStatistics) {
4065 return true;
4066 }
4067 #endif // COMPILER2
4068
4069 return false;
4070 }
4071
4072 #endif // PRODUCT
4073
4074 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4075 for (int index = 0; index < args->nOptions; index++) {
4076 const JavaVMOption* option = args->options + index;
4077 const char* tail;
4078 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4079 return true;
4080 }
4081 }
4082 return false;
4083 }
4084
4085 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4086 const char* vm_options_file,
4087 const int vm_options_file_pos,
4088 ScopedVMInitArgs* vm_options_file_args,
4089 ScopedVMInitArgs* args_out) {
4090 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4091 if (code != JNI_OK) {
4092 return code;
4093 }
4094
4095 if (vm_options_file_args->get()->nOptions < 1) {
4096 return JNI_OK;
4097 }
4098
4099 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4100 jio_fprintf(defaultStream::error_stream(),
4101 "A VM options file may not refer to a VM options file. "
4102 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4103 "options file '%s' in options container '%s' is an error.\n",
4104 vm_options_file_args->vm_options_file_arg(),
4105 vm_options_file_args->container_name());
4106 return JNI_EINVAL;
4107 }
4108
4109 return args_out->insert(args, vm_options_file_args->get(),
4110 vm_options_file_pos);
4111 }
4112
4113 // Expand -XX:VMOptionsFile found in args_in as needed.
4114 // mod_args and args_out parameters may return values as needed.
4115 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4116 ScopedVMInitArgs* mod_args,
4117 JavaVMInitArgs** args_out) {
4118 jint code = match_special_option_and_act(args_in, mod_args);
4119 if (code != JNI_OK) {
4120 return code;
4121 }
4122
4123 if (mod_args->is_set()) {
4124 // args_in contains -XX:VMOptionsFile and mod_args contains the
4125 // original options from args_in along with the options expanded
4126 // from the VMOptionsFile. Return a short-hand to the caller.
4127 *args_out = mod_args->get();
4128 } else {
4129 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4130 }
4131 return JNI_OK;
4132 }
4133
4134 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4135 ScopedVMInitArgs* args_out) {
4136 // Remaining part of option string
4137 const char* tail;
4138 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4139
4140 for (int index = 0; index < args->nOptions; index++) {
4141 const JavaVMOption* option = args->options + index;
4142 if (ArgumentsExt::process_options(option)) {
4143 continue;
4144 }
4145 if (match_option(option, "-XX:Flags=", &tail)) {
4146 Arguments::set_jvm_flags_file(tail);
4147 continue;
4148 }
4149 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4150 if (vm_options_file_args.found_vm_options_file_arg()) {
4151 jio_fprintf(defaultStream::error_stream(),
4152 "The option '%s' is already specified in the options "
4153 "container '%s' so the specification of '%s' in the "
4154 "same options container is an error.\n",
4155 vm_options_file_args.vm_options_file_arg(),
4156 vm_options_file_args.container_name(),
4157 option->optionString);
4158 return JNI_EINVAL;
4159 }
4160 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4161 // If there's a VMOptionsFile, parse that
4162 jint code = insert_vm_options_file(args, tail, index,
4163 &vm_options_file_args, args_out);
4164 if (code != JNI_OK) {
4165 return code;
4166 }
4167 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4168 if (args_out->is_set()) {
4169 // The VMOptions file inserted some options so switch 'args'
4170 // to the new set of options, and continue processing which
4171 // preserves "last option wins" semantics.
4172 args = args_out->get();
4173 // The first option from the VMOptionsFile replaces the
4174 // current option. So we back track to process the
4175 // replacement option.
4176 index--;
4177 }
4178 continue;
4179 }
4180 if (match_option(option, "-XX:+PrintVMOptions")) {
4181 PrintVMOptions = true;
4182 continue;
4183 }
4184 if (match_option(option, "-XX:-PrintVMOptions")) {
4185 PrintVMOptions = false;
4186 continue;
4187 }
4188 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4189 IgnoreUnrecognizedVMOptions = true;
4190 continue;
4191 }
4192 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4193 IgnoreUnrecognizedVMOptions = false;
4194 continue;
4195 }
4196 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4197 CommandLineFlags::printFlags(tty, false);
4198 vm_exit(0);
4199 }
4200 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4201 #if INCLUDE_NMT
4202 // The launcher did not setup nmt environment variable properly.
4203 if (!MemTracker::check_launcher_nmt_support(tail)) {
4204 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4205 }
4206
4207 // Verify if nmt option is valid.
4208 if (MemTracker::verify_nmt_option()) {
4209 // Late initialization, still in single-threaded mode.
4210 if (MemTracker::tracking_level() >= NMT_summary) {
4211 MemTracker::init();
4212 }
4213 } else {
4214 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4215 }
4216 continue;
4217 #else
4218 jio_fprintf(defaultStream::error_stream(),
4219 "Native Memory Tracking is not supported in this VM\n");
4220 return JNI_ERR;
4221 #endif
4222 }
4223
4224 #ifndef PRODUCT
4225 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4226 CommandLineFlags::printFlags(tty, true);
4227 vm_exit(0);
4228 }
4229 #endif
4230 }
4231 return JNI_OK;
4232 }
4233
4234 static void print_options(const JavaVMInitArgs *args) {
4235 const char* tail;
4236 for (int index = 0; index < args->nOptions; index++) {
4237 const JavaVMOption *option = args->options + index;
4238 if (match_option(option, "-XX:", &tail)) {
4239 logOption(tail);
4240 }
4241 }
4242 }
4243
4244 bool Arguments::handle_deprecated_print_gc_flags() {
4245 if (PrintGC) {
4246 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4247 }
4248 if (PrintGCDetails) {
4249 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4250 }
4251
4252 if (_gc_log_filename != NULL) {
4253 // -Xloggc was used to specify a filename
4254 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4255 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4256 } else if (PrintGC || PrintGCDetails) {
4257 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4258 }
4259 return true;
4260 }
4261
4262 // Parse entry point called from JNI_CreateJavaVM
4263
4264 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4265 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4266
4267 // Initialize ranges and constraints
4268 CommandLineFlagRangeList::init();
4269 CommandLineFlagConstraintList::init();
4270
4271 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4272 const char* hotspotrc = ".hotspotrc";
4273 bool settings_file_specified = false;
4274 bool needs_hotspotrc_warning = false;
4275 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4276 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4277
4278 // Pointers to current working set of containers
4279 JavaVMInitArgs* cur_cmd_args;
4280 JavaVMInitArgs* cur_java_options_args;
4281 JavaVMInitArgs* cur_java_tool_options_args;
4282
4283 // Containers for modified/expanded options
4284 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4285 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4286 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4287
4288
4289 jint code =
4290 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4291 if (code != JNI_OK) {
4292 return code;
4293 }
4294
4295 code = parse_java_options_environment_variable(&initial_java_options_args);
4296 if (code != JNI_OK) {
4297 return code;
4298 }
4299
4300 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4301 &mod_java_tool_options_args,
4302 &cur_java_tool_options_args);
4303 if (code != JNI_OK) {
4304 return code;
4305 }
4306
4307 code = expand_vm_options_as_needed(initial_cmd_args,
4308 &mod_cmd_args,
4309 &cur_cmd_args);
4310 if (code != JNI_OK) {
4311 return code;
4312 }
4313
4314 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4315 &mod_java_options_args,
4316 &cur_java_options_args);
4317 if (code != JNI_OK) {
4318 return code;
4319 }
4320
4321 const char* flags_file = Arguments::get_jvm_flags_file();
4322 settings_file_specified = (flags_file != NULL);
4323
4324 if (IgnoreUnrecognizedVMOptions) {
4325 cur_cmd_args->ignoreUnrecognized = true;
4326 cur_java_tool_options_args->ignoreUnrecognized = true;
4327 cur_java_options_args->ignoreUnrecognized = true;
4328 }
4329
4330 // Parse specified settings file
4331 if (settings_file_specified) {
4332 if (!process_settings_file(flags_file, true,
4333 cur_cmd_args->ignoreUnrecognized)) {
4334 return JNI_EINVAL;
4335 }
4336 } else {
4337 #ifdef ASSERT
4338 // Parse default .hotspotrc settings file
4339 if (!process_settings_file(".hotspotrc", false,
4340 cur_cmd_args->ignoreUnrecognized)) {
4341 return JNI_EINVAL;
4342 }
4343 #else
4344 struct stat buf;
4345 if (os::stat(hotspotrc, &buf) == 0) {
4346 needs_hotspotrc_warning = true;
4347 }
4348 #endif
4349 }
4350
4351 if (PrintVMOptions) {
4352 print_options(cur_java_tool_options_args);
4353 print_options(cur_cmd_args);
4354 print_options(cur_java_options_args);
4355 }
4356
4357 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4358 jint result = parse_vm_init_args(cur_java_tool_options_args,
4359 cur_java_options_args,
4360 cur_cmd_args);
4361
4362 if (result != JNI_OK) {
4363 return result;
4364 }
4365
4366 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4367 SharedArchivePath = get_shared_archive_path();
4368 if (SharedArchivePath == NULL) {
4369 return JNI_ENOMEM;
4370 }
4371
4372 // Set up VerifySharedSpaces
4373 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4374 VerifySharedSpaces = true;
4375 }
4376
4377 // Delay warning until here so that we've had a chance to process
4378 // the -XX:-PrintWarnings flag
4379 if (needs_hotspotrc_warning) {
4380 warning("%s file is present but has been ignored. "
4381 "Run with -XX:Flags=%s to load the file.",
4382 hotspotrc, hotspotrc);
4383 }
4384
4385 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4386 UNSUPPORTED_OPTION(UseLargePages);
4387 #endif
4388
4389 ArgumentsExt::report_unsupported_options();
4390
4391 #ifndef PRODUCT
4392 if (TraceBytecodesAt != 0) {
4393 TraceBytecodes = true;
4394 }
4395 if (CountCompiledCalls) {
4396 if (UseCounterDecay) {
4397 warning("UseCounterDecay disabled because CountCalls is set");
4398 UseCounterDecay = false;
4399 }
4400 }
4401 #endif // PRODUCT
4402
4403 if (ScavengeRootsInCode == 0) {
4404 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4405 warning("Forcing ScavengeRootsInCode non-zero");
4406 }
4407 ScavengeRootsInCode = 1;
4408 }
4409
4410 if (!handle_deprecated_print_gc_flags()) {
4411 return JNI_EINVAL;
4412 }
4413
4414 // Set object alignment values.
4415 set_object_alignment();
4416
4417 #if !INCLUDE_CDS
4418 if (DumpSharedSpaces || RequireSharedSpaces) {
4419 jio_fprintf(defaultStream::error_stream(),
4420 "Shared spaces are not supported in this VM\n");
4421 return JNI_ERR;
4422 }
4423 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4424 warning("Shared spaces are not supported in this VM");
4425 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4426 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4427 }
4428 no_shared_spaces("CDS Disabled");
4429 #endif // INCLUDE_CDS
4430
4431 return JNI_OK;
4432 }
4433
4434 jint Arguments::apply_ergo() {
4435
4436 // Set flags based on ergonomics.
4437 set_ergonomics_flags();
4438
4439 set_shared_spaces_flags();
4440
4441 // Check the GC selections again.
4442 if (!check_gc_consistency()) {
4443 return JNI_EINVAL;
4444 }
4445
4446 if (TieredCompilation) {
4447 set_tiered_flags();
4448 } else {
4449 int max_compilation_policy_choice = 1;
4450 #ifdef COMPILER2
4451 max_compilation_policy_choice = 2;
4452 #endif
4453 // Check if the policy is valid.
4454 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4455 vm_exit_during_initialization(
4456 "Incompatible compilation policy selected", NULL);
4457 }
4458 // Scale CompileThreshold
4459 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4460 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4461 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4462 }
4463 }
4464
4465 #ifdef COMPILER2
4466 #ifndef PRODUCT
4467 if (PrintIdealGraphLevel > 0) {
4468 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4469 }
4470 #endif
4471 #endif
4472
4473 // Set heap size based on available physical memory
4474 set_heap_size();
4475
4476 ArgumentsExt::set_gc_specific_flags();
4477
4478 // Initialize Metaspace flags and alignments
4479 Metaspace::ergo_initialize();
4480
4481 // Set bytecode rewriting flags
4482 set_bytecode_flags();
4483
4484 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4485 jint code = set_aggressive_opts_flags();
4486 if (code != JNI_OK) {
4487 return code;
4488 }
4489
4490 // Turn off biased locking for locking debug mode flags,
4491 // which are subtly different from each other but neither works with
4492 // biased locking
4493 if (UseHeavyMonitors
4494 #ifdef COMPILER1
4495 || !UseFastLocking
4496 #endif // COMPILER1
4497 #if INCLUDE_JVMCI
4498 || !JVMCIUseFastLocking
4499 #endif
4500 ) {
4501 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4502 // flag set to true on command line; warn the user that they
4503 // can't enable biased locking here
4504 warning("Biased Locking is not supported with locking debug flags"
4505 "; ignoring UseBiasedLocking flag." );
4506 }
4507 UseBiasedLocking = false;
4508 }
4509
4510 #ifdef CC_INTERP
4511 // Clear flags not supported on zero.
4512 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4513 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4514 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4515 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4516 #endif // CC_INTERP
4517
4518 #ifdef COMPILER2
4519 if (!EliminateLocks) {
4520 EliminateNestedLocks = false;
4521 }
4522 if (!Inline) {
4523 IncrementalInline = false;
4524 }
4525 #ifndef PRODUCT
4526 if (!IncrementalInline) {
4527 AlwaysIncrementalInline = false;
4528 }
4529 #endif
4530 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4531 // nothing to use the profiling, turn if off
4532 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4533 }
4534 #endif
4535
4536 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4537 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4538 DebugNonSafepoints = true;
4539 }
4540
4541 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4542 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4543 }
4544
4545 if (UseOnStackReplacement && !UseLoopCounter) {
4546 warning("On-stack-replacement requires loop counters; enabling loop counters");
4547 FLAG_SET_DEFAULT(UseLoopCounter, true);
4548 }
4549
4550 #ifndef PRODUCT
4551 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4552 if (use_vm_log()) {
4553 LogVMOutput = true;
4554 }
4555 }
4556 #endif // PRODUCT
4557
4558 if (PrintCommandLineFlags) {
4559 CommandLineFlags::printSetFlags(tty);
4560 }
4561
4562 // Apply CPU specific policy for the BiasedLocking
4563 if (UseBiasedLocking) {
4564 if (!VM_Version::use_biased_locking() &&
4565 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4566 UseBiasedLocking = false;
4567 }
4568 }
4569 #ifdef COMPILER2
4570 if (!UseBiasedLocking || EmitSync != 0) {
4571 UseOptoBiasInlining = false;
4572 }
4573 #endif
4574
4575 return JNI_OK;
4576 }
4577
4578 jint Arguments::adjust_after_os() {
4579 if (UseNUMA) {
4580 if (UseParallelGC || UseParallelOldGC) {
4581 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4582 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4583 }
4584 }
4585 // UseNUMAInterleaving is set to ON for all collectors and
4586 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4587 // such as the parallel collector for Linux and Solaris will
4588 // interleave old gen and survivor spaces on top of NUMA
4589 // allocation policy for the eden space.
4590 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4591 // all platforms and ParallelGC on Windows will interleave all
4592 // of the heap spaces across NUMA nodes.
4593 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4594 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4595 }
4596 }
4597 return JNI_OK;
4598 }
4599
4600 int Arguments::PropertyList_count(SystemProperty* pl) {
4601 int count = 0;
4602 while(pl != NULL) {
4603 count++;
4604 pl = pl->next();
4605 }
4606 return count;
4607 }
4608
4609 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4610 assert(key != NULL, "just checking");
4611 SystemProperty* prop;
4612 for (prop = pl; prop != NULL; prop = prop->next()) {
4613 if (strcmp(key, prop->key()) == 0) return prop->value();
4614 }
4615 return NULL;
4616 }
4617
4618 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4619 int count = 0;
4620 const char* ret_val = NULL;
4621
4622 while(pl != NULL) {
4623 if(count >= index) {
4624 ret_val = pl->key();
4625 break;
4626 }
4627 count++;
4628 pl = pl->next();
4629 }
4630
4631 return ret_val;
4632 }
4633
4634 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4635 int count = 0;
4636 char* ret_val = NULL;
4637
4638 while(pl != NULL) {
4639 if(count >= index) {
4640 ret_val = pl->value();
4641 break;
4642 }
4643 count++;
4644 pl = pl->next();
4645 }
4646
4647 return ret_val;
4648 }
4649
4650 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4651 SystemProperty* p = *plist;
4652 if (p == NULL) {
4653 *plist = new_p;
4654 } else {
4655 while (p->next() != NULL) {
4656 p = p->next();
4657 }
4658 p->set_next(new_p);
4659 }
4660 }
4661
4662 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4663 if (plist == NULL)
4664 return;
4665
4666 SystemProperty* new_p = new SystemProperty(k, v, true);
4667 PropertyList_add(plist, new_p);
4668 }
4669
4670 void Arguments::PropertyList_add(SystemProperty *element) {
4671 PropertyList_add(&_system_properties, element);
4672 }
4673
4674 // This add maintains unique property key in the list.
4675 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4676 if (plist == NULL)
4677 return;
4678
4679 // If property key exist then update with new value.
4680 SystemProperty* prop;
4681 for (prop = *plist; prop != NULL; prop = prop->next()) {
4682 if (strcmp(k, prop->key()) == 0) {
4683 if (append) {
4684 prop->append_value(v);
4685 } else {
4686 prop->set_writeable_value(v);
4687 }
4688 return;
4689 }
4690 }
4691
4692 PropertyList_add(plist, k, v);
4693 }
4694
4695 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4696 // Returns true if all of the source pointed by src has been copied over to
4697 // the destination buffer pointed by buf. Otherwise, returns false.
4698 // Notes:
4699 // 1. If the length (buflen) of the destination buffer excluding the
4700 // NULL terminator character is not long enough for holding the expanded
4701 // pid characters, it also returns false instead of returning the partially
4702 // expanded one.
4703 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4704 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4705 char* buf, size_t buflen) {
4706 const char* p = src;
4707 char* b = buf;
4708 const char* src_end = &src[srclen];
4709 char* buf_end = &buf[buflen - 1];
4710
4711 while (p < src_end && b < buf_end) {
4712 if (*p == '%') {
4713 switch (*(++p)) {
4714 case '%': // "%%" ==> "%"
4715 *b++ = *p++;
4716 break;
4717 case 'p': { // "%p" ==> current process id
4718 // buf_end points to the character before the last character so
4719 // that we could write '\0' to the end of the buffer.
4720 size_t buf_sz = buf_end - b + 1;
4721 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4722
4723 // if jio_snprintf fails or the buffer is not long enough to hold
4724 // the expanded pid, returns false.
4725 if (ret < 0 || ret >= (int)buf_sz) {
4726 return false;
4727 } else {
4728 b += ret;
4729 assert(*b == '\0', "fail in copy_expand_pid");
4730 if (p == src_end && b == buf_end + 1) {
4731 // reach the end of the buffer.
4732 return true;
4733 }
4734 }
4735 p++;
4736 break;
4737 }
4738 default :
4739 *b++ = '%';
4740 }
4741 } else {
4742 *b++ = *p++;
4743 }
4744 }
4745 *b = '\0';
4746 return (p == src_end); // return false if not all of the source was copied
4747 }