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