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