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/commandLineFlagWriteableList.hpp"
46 #include "runtime/commandLineFlagRangeList.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/globals_extension.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/os.hpp"
51 #include "runtime/vm_version.hpp"
52 #include "services/management.hpp"
53 #include "services/memTracker.hpp"
54 #include "utilities/defaultStream.hpp"
55 #include "utilities/macros.hpp"
56 #include "utilities/stringUtils.hpp"
57 #if INCLUDE_JVMCI
58 #include "jvmci/jvmciRuntime.hpp"
59 #endif
60 #if INCLUDE_ALL_GCS
61 #include "gc/cms/compactibleFreeListSpace.hpp"
62 #include "gc/g1/g1CollectedHeap.inline.hpp"
63 #include "gc/parallel/parallelScavengeHeap.hpp"
64 #endif // INCLUDE_ALL_GCS
65
66 // Note: This is a special bug reporting site for the JVM
67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
68 #define DEFAULT_JAVA_LAUNCHER "generic"
69
70 char* Arguments::_jvm_flags_file = NULL;
71 char** Arguments::_jvm_flags_array = NULL;
72 int Arguments::_num_jvm_flags = 0;
73 char** Arguments::_jvm_args_array = NULL;
74 int Arguments::_num_jvm_args = 0;
75 char* Arguments::_java_command = NULL;
76 SystemProperty* Arguments::_system_properties = NULL;
77 const char* Arguments::_gc_log_filename = NULL;
78 bool Arguments::_has_profile = false;
79 size_t Arguments::_conservative_max_heap_alignment = 0;
80 size_t Arguments::_min_heap_size = 0;
81 Arguments::Mode Arguments::_mode = _mixed;
82 bool Arguments::_java_compiler = false;
83 bool Arguments::_xdebug_mode = false;
84 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
85 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
86 int Arguments::_sun_java_launcher_pid = -1;
87 bool Arguments::_sun_java_launcher_is_altjvm = false;
88 int Arguments::_bootclassloader_append_index = -1;
89
90 // These parameters are reset in method parse_vm_init_args()
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
113
114 GrowableArray<ModuleXPatchPath*> *Arguments::_xpatchprefix = NULL;
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 // NOTE: A compatibility request will be necessary for each alias to be removed.
411 static AliasedLoggingFlag const aliased_logging_flags[] = {
412 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
413 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
414 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
415 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
416 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
417 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
418 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
419 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
420 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
421 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
422 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
423 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
424 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
425 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
426 };
427
428 #ifndef PRODUCT
429 // These options are removed in jdk9. Remove this code for jdk10.
430 static AliasedFlag const removed_develop_logging_flags[] = {
431 { "TraceClassInitialization", "-Xlog:class+init" },
432 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
433 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
434 { "TraceItables", "-Xlog:itables=debug" },
435 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
436 { "TraceSafepoint", "-Xlog:safepoint=debug" },
437 { "TraceStartupTime", "-Xlog:startuptime" },
438 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
439 { "PrintVtables", "-Xlog:vtables=debug" },
440 { "VerboseVerification", "-Xlog:verification" },
441 { NULL, NULL }
442 };
443 #endif //PRODUCT
444
445 // Return true if "v" is less than "other", where "other" may be "undefined".
446 static bool version_less_than(JDK_Version v, JDK_Version other) {
447 assert(!v.is_undefined(), "must be defined");
448 if (!other.is_undefined() && v.compare(other) >= 0) {
449 return false;
450 } else {
451 return true;
452 }
453 }
454
455 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
456 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
457 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
458 flag = special_jvm_flags[i];
459 return true;
460 }
461 }
462 return false;
463 }
464
465 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
466 assert(version != NULL, "Must provide a version buffer");
467 SpecialFlag flag;
468 if (lookup_special_flag(flag_name, flag)) {
469 if (!flag.obsolete_in.is_undefined()) {
470 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
471 *version = flag.obsolete_in;
472 return true;
473 }
474 }
475 }
476 return false;
477 }
478
479 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
480 assert(version != NULL, "Must provide a version buffer");
481 SpecialFlag flag;
482 if (lookup_special_flag(flag_name, flag)) {
483 if (!flag.deprecated_in.is_undefined()) {
484 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
485 version_less_than(JDK_Version::current(), flag.expired_in)) {
486 *version = flag.deprecated_in;
487 return 1;
488 } else {
489 return -1;
490 }
491 }
492 }
493 return 0;
494 }
495
496 #ifndef PRODUCT
497 const char* Arguments::removed_develop_logging_flag_name(const char* name){
498 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
499 const AliasedFlag& flag = removed_develop_logging_flags[i];
500 if (strcmp(flag.alias_name, name) == 0) {
501 return flag.real_name;
502 }
503 }
504 return NULL;
505 }
506 #endif // PRODUCT
507
508 const char* Arguments::real_flag_name(const char *flag_name) {
509 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
510 const AliasedFlag& flag_status = aliased_jvm_flags[i];
511 if (strcmp(flag_status.alias_name, flag_name) == 0) {
512 return flag_status.real_name;
513 }
514 }
515 return flag_name;
516 }
517
518 #ifdef ASSERT
519 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
520 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
521 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
522 return true;
523 }
524 }
525 return false;
526 }
527
528 static bool verify_special_jvm_flags() {
529 bool success = true;
530 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
531 const SpecialFlag& flag = special_jvm_flags[i];
532 if (lookup_special_flag(flag.name, i)) {
533 warning("Duplicate special flag declaration \"%s\"", flag.name);
534 success = false;
535 }
536 if (flag.deprecated_in.is_undefined() &&
537 flag.obsolete_in.is_undefined()) {
538 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
539 success = false;
540 }
541
542 if (!flag.deprecated_in.is_undefined()) {
543 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
544 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
545 success = false;
546 }
547
548 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
549 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
550 success = false;
551 }
552 }
553
554 if (!flag.obsolete_in.is_undefined()) {
555 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
556 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
557 success = false;
558 }
559
560 // if flag has become obsolete it should not have a "globals" flag defined anymore.
561 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
562 if (Flag::find_flag(flag.name) != NULL) {
563 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
564 success = false;
565 }
566 }
567 }
568
569 if (!flag.expired_in.is_undefined()) {
570 // if flag has become expired it should not have a "globals" flag defined anymore.
571 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
572 if (Flag::find_flag(flag.name) != NULL) {
573 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
574 success = false;
575 }
576 }
577 }
578
579 }
580 return success;
581 }
582 #endif
583
584 // Parses a size specification string.
585 bool Arguments::atojulong(const char *s, julong* result) {
586 julong n = 0;
587 int args_read = 0;
588 bool is_hex = false;
589 // Skip leading 0[xX] for hexadecimal
590 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
591 s += 2;
592 is_hex = true;
593 args_read = sscanf(s, JULONG_FORMAT_X, &n);
594 } else {
595 args_read = sscanf(s, JULONG_FORMAT, &n);
596 }
597 if (args_read != 1) {
598 return false;
599 }
600 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
601 s++;
602 }
603 // 4705540: illegal if more characters are found after the first non-digit
604 if (strlen(s) > 1) {
605 return false;
606 }
607 switch (*s) {
608 case 'T': case 't':
609 *result = n * G * K;
610 // Check for overflow.
611 if (*result/((julong)G * K) != n) return false;
612 return true;
613 case 'G': case 'g':
614 *result = n * G;
615 if (*result/G != n) return false;
616 return true;
617 case 'M': case 'm':
618 *result = n * M;
619 if (*result/M != n) return false;
620 return true;
621 case 'K': case 'k':
622 *result = n * K;
623 if (*result/K != n) return false;
624 return true;
625 case '\0':
626 *result = n;
627 return true;
628 default:
629 return false;
630 }
631 }
632
633 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
634 if (size < min_size) return arg_too_small;
635 // Check that size will fit in a size_t (only relevant on 32-bit)
636 if (size > max_uintx) return arg_too_big;
637 return arg_in_range;
638 }
639
640 // Describe an argument out of range error
641 void Arguments::describe_range_error(ArgsRange errcode) {
642 switch(errcode) {
643 case arg_too_big:
644 jio_fprintf(defaultStream::error_stream(),
645 "The specified size exceeds the maximum "
646 "representable size.\n");
647 break;
648 case arg_too_small:
649 case arg_unreadable:
650 case arg_in_range:
651 // do nothing for now
652 break;
653 default:
654 ShouldNotReachHere();
655 }
656 }
657
658 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
659 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
660 return true;
661 } else {
662 return false;
663 }
664 }
665
666 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
667 char* end;
668 errno = 0;
669 double v = strtod(value, &end);
670 if ((errno != 0) || (*end != 0)) {
671 return false;
672 }
673
674 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
675 return true;
676 }
677 return false;
678 }
679
680 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
681 julong v;
682 int int_v;
683 intx intx_v;
684 bool is_neg = false;
685 Flag* result = Flag::find_flag(name, strlen(name));
686
687 if (result == NULL) {
688 return false;
689 }
690
691 // Check the sign first since atojulong() parses only unsigned values.
692 if (*value == '-') {
693 if (!result->is_intx() && !result->is_int()) {
694 return false;
695 }
696 value++;
697 is_neg = true;
698 }
699 if (!Arguments::atojulong(value, &v)) {
700 return false;
701 }
702 if (result->is_int()) {
703 int_v = (int) v;
704 if (is_neg) {
705 int_v = -int_v;
706 }
707 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
708 } else if (result->is_uint()) {
709 uint uint_v = (uint) v;
710 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
711 } else if (result->is_intx()) {
712 intx_v = (intx) v;
713 if (is_neg) {
714 intx_v = -intx_v;
715 }
716 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
717 } else if (result->is_uintx()) {
718 uintx uintx_v = (uintx) v;
719 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
720 } else if (result->is_uint64_t()) {
721 uint64_t uint64_t_v = (uint64_t) v;
722 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
723 } else if (result->is_size_t()) {
724 size_t size_t_v = (size_t) v;
725 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
726 } else {
727 return false;
728 }
729 }
730
731 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
732 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
733 // Contract: CommandLineFlags always returns a pointer that needs freeing.
734 FREE_C_HEAP_ARRAY(char, value);
735 return true;
736 }
737
738 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
739 const char* old_value = "";
740 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
741 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
742 size_t new_len = strlen(new_value);
743 const char* value;
744 char* free_this_too = NULL;
745 if (old_len == 0) {
746 value = new_value;
747 } else if (new_len == 0) {
748 value = old_value;
749 } else {
750 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments);
751 // each new setting adds another LINE to the switch:
752 sprintf(buf, "%s\n%s", old_value, new_value);
753 value = buf;
754 free_this_too = buf;
755 }
756 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
757 // CommandLineFlags always returns a pointer that needs freeing.
758 FREE_C_HEAP_ARRAY(char, value);
759 if (free_this_too != NULL) {
760 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
761 FREE_C_HEAP_ARRAY(char, free_this_too);
762 }
763 return true;
764 }
765
766 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
767 const char* real_name = real_flag_name(arg);
768 JDK_Version since = JDK_Version();
769 switch (is_deprecated_flag(arg, &since)) {
770 case -1:
771 return NULL; // obsolete or expired, don't process normally
772 case 0:
773 return real_name;
774 case 1: {
775 if (warn) {
776 char version[256];
777 since.to_string(version, sizeof(version));
778 if (real_name != arg) {
779 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
780 arg, version, real_name);
781 } else {
782 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
783 arg, version);
784 }
785 }
786 return real_name;
787 }
788 }
789 ShouldNotReachHere();
790 return NULL;
791 }
792
793 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
794 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
795 // Set tagset string buffer at max size of 256, large enough for any alias tagset
796 const int max_tagset_size = 256;
797 int max_tagset_len = max_tagset_size - 1;
798 char tagset_buffer[max_tagset_size];
799 tagset_buffer[0] = '\0';
800
801 // Write tag-set for aliased logging option, in string list form
802 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
803 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
804 if (i > 0) {
805 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
806 }
807 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
808 }
809 if (!alf.exactMatch) {
810 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
811 }
812 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
813 (on) ? "+" : "-",
814 name,
815 tagset_buffer,
816 (on) ? LogLevel::name(alf.level) : "off");
817 }
818
819 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
820 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
821 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
822 if (strcmp(alf.alias_name, name) == 0) {
823 log_deprecated_flag(name, on, alf);
824 return alf;
825 }
826 }
827 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
828 return a;
829 }
830
831 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
832
833 // range of acceptable characters spelled out for portability reasons
834 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
835 #define BUFLEN 255
836 char name[BUFLEN+1];
837 char dummy;
838 const char* real_name;
839 bool warn_if_deprecated = true;
840
841 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
842 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
843 if (alf.alias_name != NULL){
844 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
845 return true;
846 }
847 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
848 if (real_name == NULL) {
849 return false;
850 }
851 return set_bool_flag(real_name, false, origin);
852 }
853 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
854 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
855 if (alf.alias_name != NULL){
856 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
857 return true;
858 }
859 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
860 if (real_name == NULL) {
861 return false;
862 }
863 return set_bool_flag(real_name, true, origin);
864 }
865
866 char punct;
867 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
868 const char* value = strchr(arg, '=') + 1;
869 Flag* flag;
870
871 // this scanf pattern matches both strings (handled here) and numbers (handled later))
872 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
873 if (alf.alias_name != NULL) {
874 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
875 return true;
876 }
877 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
878 if (real_name == NULL) {
879 return false;
880 }
881 flag = Flag::find_flag(real_name);
882 if (flag != NULL && flag->is_ccstr()) {
883 if (flag->ccstr_accumulates()) {
884 return append_to_string_flag(real_name, value, origin);
885 } else {
886 if (value[0] == '\0') {
887 value = NULL;
888 }
889 return set_string_flag(real_name, value, origin);
890 }
891 } else {
892 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
893 }
894 }
895
896 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
897 const char* value = strchr(arg, '=') + 1;
898 // -XX:Foo:=xxx will reset the string flag to the given value.
899 if (value[0] == '\0') {
900 value = NULL;
901 }
902 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
903 if (real_name == NULL) {
904 return false;
905 }
906 return set_string_flag(real_name, value, origin);
907 }
908
909 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
910 #define SIGNED_NUMBER_RANGE "[-0123456789]"
911 #define NUMBER_RANGE "[0123456789eE+-]"
912 char value[BUFLEN + 1];
913 char value2[BUFLEN + 1];
914 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
915 // Looks like a floating-point number -- try again with more lenient format string
916 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
917 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
918 if (real_name == NULL) {
919 return false;
920 }
921 return set_fp_numeric_flag(real_name, value, origin);
922 }
923 }
924
925 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
926 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
927 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
928 if (real_name == NULL) {
929 return false;
930 }
931 return set_numeric_flag(real_name, value, origin);
932 }
933
934 return false;
935 }
936
937 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
938 assert(bldarray != NULL, "illegal argument");
939
940 if (arg == NULL) {
941 return;
942 }
943
944 int new_count = *count + 1;
945
946 // expand the array and add arg to the last element
947 if (*bldarray == NULL) {
948 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
949 } else {
950 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
951 }
952 (*bldarray)[*count] = os::strdup_check_oom(arg);
953 *count = new_count;
954 }
955
956 void Arguments::build_jvm_args(const char* arg) {
957 add_string(&_jvm_args_array, &_num_jvm_args, arg);
958 }
959
960 void Arguments::build_jvm_flags(const char* arg) {
961 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
962 }
963
964 // utility function to return a string that concatenates all
965 // strings in a given char** array
966 const char* Arguments::build_resource_string(char** args, int count) {
967 if (args == NULL || count == 0) {
968 return NULL;
969 }
970 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
971 for (int i = 1; i < count; i++) {
972 length += strlen(args[i]) + 1; // add 1 for a space
973 }
974 char* s = NEW_RESOURCE_ARRAY(char, length);
975 strcpy(s, args[0]);
976 for (int j = 1; j < count; j++) {
977 strcat(s, " ");
978 strcat(s, args[j]);
979 }
980 return (const char*) s;
981 }
982
983 void Arguments::print_on(outputStream* st) {
984 st->print_cr("VM Arguments:");
985 if (num_jvm_flags() > 0) {
986 st->print("jvm_flags: "); print_jvm_flags_on(st);
987 st->cr();
988 }
989 if (num_jvm_args() > 0) {
990 st->print("jvm_args: "); print_jvm_args_on(st);
991 st->cr();
992 }
993 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
994 if (_java_class_path != NULL) {
995 char* path = _java_class_path->value();
996 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
997 }
998 st->print_cr("Launcher Type: %s", _sun_java_launcher);
999 }
1000
1001 void Arguments::print_summary_on(outputStream* st) {
1002 // Print the command line. Environment variables that are helpful for
1003 // reproducing the problem are written later in the hs_err file.
1004 // flags are from setting file
1005 if (num_jvm_flags() > 0) {
1006 st->print_raw("Settings File: ");
1007 print_jvm_flags_on(st);
1008 st->cr();
1009 }
1010 // args are the command line and environment variable arguments.
1011 st->print_raw("Command Line: ");
1012 if (num_jvm_args() > 0) {
1013 print_jvm_args_on(st);
1014 }
1015 // this is the classfile and any arguments to the java program
1016 if (java_command() != NULL) {
1017 st->print("%s", java_command());
1018 }
1019 st->cr();
1020 }
1021
1022 void Arguments::print_jvm_flags_on(outputStream* st) {
1023 if (_num_jvm_flags > 0) {
1024 for (int i=0; i < _num_jvm_flags; i++) {
1025 st->print("%s ", _jvm_flags_array[i]);
1026 }
1027 }
1028 }
1029
1030 void Arguments::print_jvm_args_on(outputStream* st) {
1031 if (_num_jvm_args > 0) {
1032 for (int i=0; i < _num_jvm_args; i++) {
1033 st->print("%s ", _jvm_args_array[i]);
1034 }
1035 }
1036 }
1037
1038 bool Arguments::process_argument(const char* arg,
1039 jboolean ignore_unrecognized,
1040 Flag::Flags origin) {
1041 JDK_Version since = JDK_Version();
1042
1043 if (parse_argument(arg, origin)) {
1044 return true;
1045 }
1046
1047 // Determine if the flag has '+', '-', or '=' characters.
1048 bool has_plus_minus = (*arg == '+' || *arg == '-');
1049 const char* const argname = has_plus_minus ? arg + 1 : arg;
1050
1051 size_t arg_len;
1052 const char* equal_sign = strchr(argname, '=');
1053 if (equal_sign == NULL) {
1054 arg_len = strlen(argname);
1055 } else {
1056 arg_len = equal_sign - argname;
1057 }
1058
1059 // Only make the obsolete check for valid arguments.
1060 if (arg_len <= BUFLEN) {
1061 // Construct a string which consists only of the argument name without '+', '-', or '='.
1062 char stripped_argname[BUFLEN+1];
1063 strncpy(stripped_argname, argname, arg_len);
1064 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1065 if (is_obsolete_flag(stripped_argname, &since)) {
1066 char version[256];
1067 since.to_string(version, sizeof(version));
1068 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1069 return true;
1070 }
1071 #ifndef PRODUCT
1072 else {
1073 const char* replacement;
1074 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1075 log_warning(arguments)("%s has been removed. Please use %s instead.",
1076 stripped_argname,
1077 replacement);
1078 return false;
1079 }
1080 }
1081 #endif //PRODUCT
1082 }
1083
1084 // For locked flags, report a custom error message if available.
1085 // Otherwise, report the standard unrecognized VM option.
1086 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1087 if (found_flag != NULL) {
1088 char locked_message_buf[BUFLEN];
1089 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1090 if (strlen(locked_message_buf) == 0) {
1091 if (found_flag->is_bool() && !has_plus_minus) {
1092 jio_fprintf(defaultStream::error_stream(),
1093 "Missing +/- setting for VM option '%s'\n", argname);
1094 } else if (!found_flag->is_bool() && has_plus_minus) {
1095 jio_fprintf(defaultStream::error_stream(),
1096 "Unexpected +/- setting in VM option '%s'\n", argname);
1097 } else {
1098 jio_fprintf(defaultStream::error_stream(),
1099 "Improperly specified VM option '%s'\n", argname);
1100 }
1101 } else {
1102 #ifdef PRODUCT
1103 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1104 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1105 if (ignore_unrecognized && mismatched) {
1106 return true;
1107 }
1108 #endif
1109 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1110 }
1111 } else {
1112 if (ignore_unrecognized) {
1113 return true;
1114 }
1115 jio_fprintf(defaultStream::error_stream(),
1116 "Unrecognized VM option '%s'\n", argname);
1117 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1118 if (fuzzy_matched != NULL) {
1119 jio_fprintf(defaultStream::error_stream(),
1120 "Did you mean '%s%s%s'? ",
1121 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1122 fuzzy_matched->_name,
1123 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1124 }
1125 }
1126
1127 // allow for commandline "commenting out" options like -XX:#+Verbose
1128 return arg[0] == '#';
1129 }
1130
1131 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1132 FILE* stream = fopen(file_name, "rb");
1133 if (stream == NULL) {
1134 if (should_exist) {
1135 jio_fprintf(defaultStream::error_stream(),
1136 "Could not open settings file %s\n", file_name);
1137 return false;
1138 } else {
1139 return true;
1140 }
1141 }
1142
1143 char token[1024];
1144 int pos = 0;
1145
1146 bool in_white_space = true;
1147 bool in_comment = false;
1148 bool in_quote = false;
1149 char quote_c = 0;
1150 bool result = true;
1151
1152 int c = getc(stream);
1153 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1154 if (in_white_space) {
1155 if (in_comment) {
1156 if (c == '\n') in_comment = false;
1157 } else {
1158 if (c == '#') in_comment = true;
1159 else if (!isspace(c)) {
1160 in_white_space = false;
1161 token[pos++] = c;
1162 }
1163 }
1164 } else {
1165 if (c == '\n' || (!in_quote && isspace(c))) {
1166 // token ends at newline, or at unquoted whitespace
1167 // this allows a way to include spaces in string-valued options
1168 token[pos] = '\0';
1169 logOption(token);
1170 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1171 build_jvm_flags(token);
1172 pos = 0;
1173 in_white_space = true;
1174 in_quote = false;
1175 } else if (!in_quote && (c == '\'' || c == '"')) {
1176 in_quote = true;
1177 quote_c = c;
1178 } else if (in_quote && (c == quote_c)) {
1179 in_quote = false;
1180 } else {
1181 token[pos++] = c;
1182 }
1183 }
1184 c = getc(stream);
1185 }
1186 if (pos > 0) {
1187 token[pos] = '\0';
1188 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1189 build_jvm_flags(token);
1190 }
1191 fclose(stream);
1192 return result;
1193 }
1194
1195 //=============================================================================================================
1196 // Parsing of properties (-D)
1197
1198 const char* Arguments::get_property(const char* key) {
1199 return PropertyList_get_value(system_properties(), key);
1200 }
1201
1202 bool Arguments::add_property(const char* prop) {
1203 const char* eq = strchr(prop, '=');
1204 const char* key;
1205 const char* value = "";
1206
1207 if (eq == NULL) {
1208 // property doesn't have a value, thus use passed string
1209 key = prop;
1210 } else {
1211 // property have a value, thus extract it and save to the
1212 // allocated string
1213 size_t key_len = eq - prop;
1214 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1215
1216 strncpy(tmp_key, prop, key_len);
1217 tmp_key[key_len] = '\0';
1218 key = tmp_key;
1219
1220 value = &prop[key_len + 1];
1221 }
1222
1223 if (strcmp(key, "java.compiler") == 0) {
1224 process_java_compiler_argument(value);
1225 // Record value in Arguments, but let it get passed to Java.
1226 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1227 strcmp(key, "sun.java.launcher.pid") == 0) {
1228 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1229 // private and are processed in process_sun_java_launcher_properties();
1230 // the sun.java.launcher property is passed on to the java application
1231 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1232 PropertyList_unique_add(&_system_properties, key, value, true);
1233 } else {
1234 if (strcmp(key, "sun.java.command") == 0) {
1235 char *old_java_command = _java_command;
1236 _java_command = os::strdup_check_oom(value, mtArguments);
1237 if (old_java_command != NULL) {
1238 os::free(old_java_command);
1239 }
1240 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1241 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1242 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1243 // its value without going through the property list or making a Java call.
1244 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1245 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1246 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1247 os::free((void *)old_java_vendor_url_bug);
1248 }
1249 }
1250
1251 // Create new property and add at the end of the list
1252 PropertyList_unique_add(&_system_properties, key, value);
1253 }
1254
1255 if (key != prop) {
1256 // SystemProperty copy passed value, thus free previously allocated
1257 // memory
1258 FreeHeap((void *)key);
1259 }
1260
1261 return true;
1262 }
1263
1264 // sets or adds a module name to the jdk.launcher.addmods property
1265 bool Arguments::append_to_addmods_property(const char* module_name) {
1266 const char* key = "jdk.launcher.addmods";
1267 const char* old_value = Arguments::get_property(key);
1268 size_t buf_len = strlen(key) + strlen(module_name) + 2;
1269 if (old_value != NULL) {
1270 buf_len += strlen(old_value) + 1;
1271 }
1272 char* new_value = AllocateHeap(buf_len, mtArguments);
1273 if (new_value == NULL) {
1274 return false;
1275 }
1276 if (old_value == NULL) {
1277 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name);
1278 } else {
1279 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name);
1280 }
1281 bool added = add_property(new_value);
1282 FreeHeap(new_value);
1283 return added;
1284 }
1285
1286 #if INCLUDE_CDS
1287 void Arguments::check_unsupported_dumping_properties() {
1288 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1289 const char* unsupported_properties[5] = { "jdk.module.main",
1290 "jdk.module.path",
1291 "jdk.upgrade.module.path",
1292 "jdk.launcher.addmods",
1293 "jdk.launcher.limitmods" };
1294 const char* unsupported_options[5] = { "-m",
1295 "-modulepath",
1296 "-upgrademodulepath",
1297 "-addmods",
1298 "-limitmods" };
1299 SystemProperty* sp = system_properties();
1300 while (sp != NULL) {
1301 for (int i = 0; i < 5; i++) {
1302 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1303 vm_exit_during_initialization(
1304 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1305 }
1306 }
1307 sp = sp->next();
1308 }
1309 }
1310 #endif
1311
1312 //===========================================================================================================
1313 // Setting int/mixed/comp mode flags
1314
1315 void Arguments::set_mode_flags(Mode mode) {
1316 // Set up default values for all flags.
1317 // If you add a flag to any of the branches below,
1318 // add a default value for it here.
1319 set_java_compiler(false);
1320 _mode = mode;
1321
1322 // Ensure Agent_OnLoad has the correct initial values.
1323 // This may not be the final mode; mode may change later in onload phase.
1324 PropertyList_unique_add(&_system_properties, "java.vm.info",
1325 VM_Version::vm_info_string(), false);
1326
1327 UseInterpreter = true;
1328 UseCompiler = true;
1329 UseLoopCounter = true;
1330
1331 // Default values may be platform/compiler dependent -
1332 // use the saved values
1333 ClipInlining = Arguments::_ClipInlining;
1334 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1335 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1336 BackgroundCompilation = Arguments::_BackgroundCompilation;
1337 if (TieredCompilation) {
1338 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1339 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1340 }
1341 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1342 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1343 }
1344 }
1345
1346 // Change from defaults based on mode
1347 switch (mode) {
1348 default:
1349 ShouldNotReachHere();
1350 break;
1351 case _int:
1352 UseCompiler = false;
1353 UseLoopCounter = false;
1354 AlwaysCompileLoopMethods = false;
1355 UseOnStackReplacement = false;
1356 break;
1357 case _mixed:
1358 // same as default
1359 break;
1360 case _comp:
1361 UseInterpreter = false;
1362 BackgroundCompilation = false;
1363 ClipInlining = false;
1364 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1365 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1366 // compile a level 4 (C2) and then continue executing it.
1367 if (TieredCompilation) {
1368 Tier3InvokeNotifyFreqLog = 0;
1369 Tier4InvocationThreshold = 0;
1370 }
1371 break;
1372 }
1373 }
1374
1375 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1376 // Conflict: required to use shared spaces (-Xshare:on), but
1377 // incompatible command line options were chosen.
1378
1379 static void no_shared_spaces(const char* message) {
1380 if (RequireSharedSpaces) {
1381 jio_fprintf(defaultStream::error_stream(),
1382 "Class data sharing is inconsistent with other specified options.\n");
1383 vm_exit_during_initialization("Unable to use shared archive.", message);
1384 } else {
1385 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1386 }
1387 }
1388 #endif
1389
1390 // Returns threshold scaled with the value of scale.
1391 // If scale < 0.0, threshold is returned without scaling.
1392 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1393 if (scale == 1.0 || scale < 0.0) {
1394 return threshold;
1395 } else {
1396 return (intx)(threshold * scale);
1397 }
1398 }
1399
1400 // Returns freq_log scaled with the value of scale.
1401 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1402 // If scale < 0.0, freq_log is returned without scaling.
1403 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1404 // Check if scaling is necessary or if negative value was specified.
1405 if (scale == 1.0 || scale < 0.0) {
1406 return freq_log;
1407 }
1408 // Check values to avoid calculating log2 of 0.
1409 if (scale == 0.0 || freq_log == 0) {
1410 return 0;
1411 }
1412 // Determine the maximum notification frequency value currently supported.
1413 // The largest mask value that the interpreter/C1 can handle is
1414 // of length InvocationCounter::number_of_count_bits. Mask values are always
1415 // one bit shorter then the value of the notification frequency. Set
1416 // max_freq_bits accordingly.
1417 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1418 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1419 if (scaled_freq == 0) {
1420 // Return 0 right away to avoid calculating log2 of 0.
1421 return 0;
1422 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1423 return max_freq_bits;
1424 } else {
1425 return log2_intptr(scaled_freq);
1426 }
1427 }
1428
1429 void Arguments::set_tiered_flags() {
1430 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1431 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1432 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1433 }
1434 if (CompilationPolicyChoice < 2) {
1435 vm_exit_during_initialization(
1436 "Incompatible compilation policy selected", NULL);
1437 }
1438 // Increase the code cache size - tiered compiles a lot more.
1439 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1440 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1441 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1442 }
1443 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1444 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1445 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1446 }
1447 if (!UseInterpreter) { // -Xcomp
1448 Tier3InvokeNotifyFreqLog = 0;
1449 Tier4InvocationThreshold = 0;
1450 }
1451
1452 if (CompileThresholdScaling < 0) {
1453 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1454 }
1455
1456 // Scale tiered compilation thresholds.
1457 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1458 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1459 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1460 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1461
1462 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1463 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1464 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1465 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1466
1467 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1468 // once these thresholds become supported.
1469
1470 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1471 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1472
1473 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1474 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1475
1476 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1477
1478 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1479 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1480 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1481 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1482 }
1483 }
1484
1485 #if INCLUDE_ALL_GCS
1486 static void disable_adaptive_size_policy(const char* collector_name) {
1487 if (UseAdaptiveSizePolicy) {
1488 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1489 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1490 collector_name);
1491 }
1492 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1493 }
1494 }
1495
1496 void Arguments::set_parnew_gc_flags() {
1497 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1498 "control point invariant");
1499 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1500 assert(UseParNewGC, "ParNew should always be used with CMS");
1501
1502 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1503 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1504 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1505 } else if (ParallelGCThreads == 0) {
1506 jio_fprintf(defaultStream::error_stream(),
1507 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1508 vm_exit(1);
1509 }
1510
1511 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1512 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1513 // we set them to 1024 and 1024.
1514 // See CR 6362902.
1515 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1516 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1517 }
1518 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1519 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1520 }
1521
1522 // When using compressed oops, we use local overflow stacks,
1523 // rather than using a global overflow list chained through
1524 // the klass word of the object's pre-image.
1525 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1526 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1527 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1528 }
1529 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1530 }
1531 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1532 }
1533
1534 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1535 // sparc/solaris for certain applications, but would gain from
1536 // further optimization and tuning efforts, and would almost
1537 // certainly gain from analysis of platform and environment.
1538 void Arguments::set_cms_and_parnew_gc_flags() {
1539 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1540 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1541 assert(UseParNewGC, "ParNew should always be used with CMS");
1542
1543 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1544 disable_adaptive_size_policy("UseConcMarkSweepGC");
1545
1546 set_parnew_gc_flags();
1547
1548 size_t max_heap = align_size_down(MaxHeapSize,
1549 CardTableRS::ct_max_alignment_constraint());
1550
1551 // Now make adjustments for CMS
1552 intx tenuring_default = (intx)6;
1553 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1554
1555 // Preferred young gen size for "short" pauses:
1556 // upper bound depends on # of threads and NewRatio.
1557 const size_t preferred_max_new_size_unaligned =
1558 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1559 size_t preferred_max_new_size =
1560 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1561
1562 // Unless explicitly requested otherwise, size young gen
1563 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1564
1565 // If either MaxNewSize or NewRatio is set on the command line,
1566 // assume the user is trying to set the size of the young gen.
1567 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1568
1569 // Set MaxNewSize to our calculated preferred_max_new_size unless
1570 // NewSize was set on the command line and it is larger than
1571 // preferred_max_new_size.
1572 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1573 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1574 } else {
1575 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1576 }
1577 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1578
1579 // Code along this path potentially sets NewSize and OldSize
1580 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1581 min_heap_size(), InitialHeapSize, max_heap);
1582 size_t min_new = preferred_max_new_size;
1583 if (FLAG_IS_CMDLINE(NewSize)) {
1584 min_new = NewSize;
1585 }
1586 if (max_heap > min_new && min_heap_size() > min_new) {
1587 // Unless explicitly requested otherwise, make young gen
1588 // at least min_new, and at most preferred_max_new_size.
1589 if (FLAG_IS_DEFAULT(NewSize)) {
1590 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1591 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1592 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1593 }
1594 // Unless explicitly requested otherwise, size old gen
1595 // so it's NewRatio x of NewSize.
1596 if (FLAG_IS_DEFAULT(OldSize)) {
1597 if (max_heap > NewSize) {
1598 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1599 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1600 }
1601 }
1602 }
1603 }
1604 // Unless explicitly requested otherwise, definitely
1605 // promote all objects surviving "tenuring_default" scavenges.
1606 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1607 FLAG_IS_DEFAULT(SurvivorRatio)) {
1608 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1609 }
1610 // If we decided above (or user explicitly requested)
1611 // `promote all' (via MaxTenuringThreshold := 0),
1612 // prefer minuscule survivor spaces so as not to waste
1613 // space for (non-existent) survivors
1614 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1615 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1616 }
1617
1618 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1619 // but rather the number of free blocks of a given size that are used when
1620 // replenishing the local per-worker free list caches.
1621 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1622 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1623 // OldPLAB sizing manually turned off: Use a larger default setting,
1624 // unless it was manually specified. This is because a too-low value
1625 // will slow down scavenges.
1626 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1627 } else {
1628 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1629 }
1630 }
1631
1632 // If either of the static initialization defaults have changed, note this
1633 // modification.
1634 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1635 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1636 }
1637
1638 if (!ClassUnloading) {
1639 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1640 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1641 }
1642
1643 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1644 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1645 }
1646 #endif // INCLUDE_ALL_GCS
1647
1648 void set_object_alignment() {
1649 // Object alignment.
1650 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1651 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1652 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1653 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1654 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1655 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1656
1657 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1658 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1659
1660 // Oop encoding heap max
1661 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1662
1663 if (SurvivorAlignmentInBytes == 0) {
1664 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1665 }
1666
1667 #if INCLUDE_ALL_GCS
1668 // Set CMS global values
1669 CompactibleFreeListSpace::set_cms_values();
1670 #endif // INCLUDE_ALL_GCS
1671 }
1672
1673 size_t Arguments::max_heap_for_compressed_oops() {
1674 // Avoid sign flip.
1675 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1676 // We need to fit both the NULL page and the heap into the memory budget, while
1677 // keeping alignment constraints of the heap. To guarantee the latter, as the
1678 // NULL page is located before the heap, we pad the NULL page to the conservative
1679 // maximum alignment that the GC may ever impose upon the heap.
1680 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1681 _conservative_max_heap_alignment);
1682
1683 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1684 NOT_LP64(ShouldNotReachHere(); return 0);
1685 }
1686
1687 bool Arguments::should_auto_select_low_pause_collector() {
1688 if (UseAutoGCSelectPolicy &&
1689 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1690 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1691 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1692 return true;
1693 }
1694 return false;
1695 }
1696
1697 void Arguments::set_use_compressed_oops() {
1698 #ifndef ZERO
1699 #ifdef _LP64
1700 // MaxHeapSize is not set up properly at this point, but
1701 // the only value that can override MaxHeapSize if we are
1702 // to use UseCompressedOops is InitialHeapSize.
1703 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1704
1705 if (max_heap_size <= max_heap_for_compressed_oops()) {
1706 #if !defined(COMPILER1) || defined(TIERED)
1707 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1708 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1709 }
1710 #endif
1711 } else {
1712 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1713 warning("Max heap size too large for Compressed Oops");
1714 FLAG_SET_DEFAULT(UseCompressedOops, false);
1715 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1716 }
1717 }
1718 #endif // _LP64
1719 #endif // ZERO
1720 }
1721
1722
1723 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1724 // set_use_compressed_oops().
1725 void Arguments::set_use_compressed_klass_ptrs() {
1726 #ifndef ZERO
1727 #ifdef _LP64
1728 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1729 if (!UseCompressedOops) {
1730 if (UseCompressedClassPointers) {
1731 warning("UseCompressedClassPointers requires UseCompressedOops");
1732 }
1733 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1734 } else {
1735 // Turn on UseCompressedClassPointers too
1736 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1737 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1738 }
1739 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1740 if (UseCompressedClassPointers) {
1741 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1742 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1743 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1744 }
1745 }
1746 }
1747 #endif // _LP64
1748 #endif // !ZERO
1749 }
1750
1751 void Arguments::set_conservative_max_heap_alignment() {
1752 // The conservative maximum required alignment for the heap is the maximum of
1753 // the alignments imposed by several sources: any requirements from the heap
1754 // itself, the collector policy and the maximum page size we may run the VM
1755 // with.
1756 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1757 #if INCLUDE_ALL_GCS
1758 if (UseParallelGC) {
1759 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1760 } else if (UseG1GC) {
1761 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1762 }
1763 #endif // INCLUDE_ALL_GCS
1764 _conservative_max_heap_alignment = MAX4(heap_alignment,
1765 (size_t)os::vm_allocation_granularity(),
1766 os::max_page_size(),
1767 CollectorPolicy::compute_heap_alignment());
1768 }
1769
1770 bool Arguments::gc_selected() {
1771 #if INCLUDE_ALL_GCS
1772 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1773 #else
1774 return UseSerialGC;
1775 #endif // INCLUDE_ALL_GCS
1776 }
1777
1778 void Arguments::select_gc_ergonomically() {
1779 #if INCLUDE_ALL_GCS
1780 if (os::is_server_class_machine()) {
1781 if (should_auto_select_low_pause_collector()) {
1782 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1783 } else {
1784 #if defined(JAVASE_EMBEDDED)
1785 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1786 #else
1787 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1788 #endif
1789 }
1790 } else {
1791 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1792 }
1793 #else
1794 UNSUPPORTED_OPTION(UseG1GC);
1795 UNSUPPORTED_OPTION(UseParallelGC);
1796 UNSUPPORTED_OPTION(UseParallelOldGC);
1797 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1798 UNSUPPORTED_OPTION(UseParNewGC);
1799 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1800 #endif // INCLUDE_ALL_GCS
1801 }
1802
1803 void Arguments::select_gc() {
1804 if (!gc_selected()) {
1805 select_gc_ergonomically();
1806 if (!gc_selected()) {
1807 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1808 }
1809 }
1810 }
1811
1812 void Arguments::set_ergonomics_flags() {
1813 select_gc();
1814
1815 #if defined(COMPILER2) || INCLUDE_JVMCI
1816 // Shared spaces work fine with other GCs but causes bytecode rewriting
1817 // to be disabled, which hurts interpreter performance and decreases
1818 // server performance. When -server is specified, keep the default off
1819 // unless it is asked for. Future work: either add bytecode rewriting
1820 // at link time, or rewrite bytecodes in non-shared methods.
1821 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1822 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1823 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1824 }
1825 #endif
1826
1827 set_conservative_max_heap_alignment();
1828
1829 #ifndef ZERO
1830 #ifdef _LP64
1831 set_use_compressed_oops();
1832
1833 // set_use_compressed_klass_ptrs() must be called after calling
1834 // set_use_compressed_oops().
1835 set_use_compressed_klass_ptrs();
1836
1837 // Also checks that certain machines are slower with compressed oops
1838 // in vm_version initialization code.
1839 #endif // _LP64
1840 #endif // !ZERO
1841
1842 CodeCacheExtensions::set_ergonomics_flags();
1843 }
1844
1845 void Arguments::set_parallel_gc_flags() {
1846 assert(UseParallelGC || UseParallelOldGC, "Error");
1847 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1848 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1849 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1850 }
1851 FLAG_SET_DEFAULT(UseParallelGC, true);
1852
1853 // If no heap maximum was requested explicitly, use some reasonable fraction
1854 // of the physical memory, up to a maximum of 1GB.
1855 FLAG_SET_DEFAULT(ParallelGCThreads,
1856 Abstract_VM_Version::parallel_worker_threads());
1857 if (ParallelGCThreads == 0) {
1858 jio_fprintf(defaultStream::error_stream(),
1859 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1860 vm_exit(1);
1861 }
1862
1863 if (UseAdaptiveSizePolicy) {
1864 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1865 // unless the user actually sets these flags.
1866 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1867 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1868 }
1869 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1870 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1871 }
1872 }
1873
1874 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1875 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1876 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1877 // See CR 6362902 for details.
1878 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1879 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1880 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1881 }
1882 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1883 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1884 }
1885 }
1886
1887 if (UseParallelOldGC) {
1888 // Par compact uses lower default values since they are treated as
1889 // minimums. These are different defaults because of the different
1890 // interpretation and are not ergonomically set.
1891 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1892 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1893 }
1894 }
1895 }
1896
1897 void Arguments::set_g1_gc_flags() {
1898 assert(UseG1GC, "Error");
1899 #if defined(COMPILER1) || INCLUDE_JVMCI
1900 FastTLABRefill = false;
1901 #endif
1902 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1903 if (ParallelGCThreads == 0) {
1904 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1905 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1906 }
1907
1908 #if INCLUDE_ALL_GCS
1909 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1910 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1911 }
1912 #endif
1913
1914 // MarkStackSize will be set (if it hasn't been set by the user)
1915 // when concurrent marking is initialized.
1916 // Its value will be based upon the number of parallel marking threads.
1917 // But we do set the maximum mark stack size here.
1918 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1919 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1920 }
1921
1922 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1923 // In G1, we want the default GC overhead goal to be higher than
1924 // it is for PS, or the heap might be expanded too aggressively.
1925 // We set it here to ~8%.
1926 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1927 }
1928
1929 // Below, we might need to calculate the pause time interval based on
1930 // the pause target. When we do so we are going to give G1 maximum
1931 // flexibility and allow it to do pauses when it needs to. So, we'll
1932 // arrange that the pause interval to be pause time target + 1 to
1933 // ensure that a) the pause time target is maximized with respect to
1934 // the pause interval and b) we maintain the invariant that pause
1935 // time target < pause interval. If the user does not want this
1936 // maximum flexibility, they will have to set the pause interval
1937 // explicitly.
1938
1939 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1940 // The default pause time target in G1 is 200ms
1941 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1942 }
1943
1944 // Then, if the interval parameter was not set, set it according to
1945 // the pause time target (this will also deal with the case when the
1946 // pause time target is the default value).
1947 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1948 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1949 }
1950
1951 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1952 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1953 }
1954
1955 void Arguments::set_gc_specific_flags() {
1956 #if INCLUDE_ALL_GCS
1957 // Set per-collector flags
1958 if (UseParallelGC || UseParallelOldGC) {
1959 set_parallel_gc_flags();
1960 } else if (UseConcMarkSweepGC) {
1961 set_cms_and_parnew_gc_flags();
1962 } else if (UseG1GC) {
1963 set_g1_gc_flags();
1964 }
1965 if (AssumeMP && !UseSerialGC) {
1966 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1967 warning("If the number of processors is expected to increase from one, then"
1968 " you should configure the number of parallel GC threads appropriately"
1969 " using -XX:ParallelGCThreads=N");
1970 }
1971 }
1972 if (MinHeapFreeRatio == 100) {
1973 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1974 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1975 }
1976 #endif // INCLUDE_ALL_GCS
1977 }
1978
1979 julong Arguments::limit_by_allocatable_memory(julong limit) {
1980 julong max_allocatable;
1981 julong result = limit;
1982 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1983 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1984 }
1985 return result;
1986 }
1987
1988 // Use static initialization to get the default before parsing
1989 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1990
1991 void Arguments::set_heap_size() {
1992 const julong phys_mem =
1993 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1994 : (julong)MaxRAM;
1995
1996 // If the maximum heap size has not been set with -Xmx,
1997 // then set it as fraction of the size of physical memory,
1998 // respecting the maximum and minimum sizes of the heap.
1999 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2000 julong reasonable_max = phys_mem / MaxRAMFraction;
2001
2002 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2003 // Small physical memory, so use a minimum fraction of it for the heap
2004 reasonable_max = phys_mem / MinRAMFraction;
2005 } else {
2006 // Not-small physical memory, so require a heap at least
2007 // as large as MaxHeapSize
2008 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2009 }
2010 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2011 // Limit the heap size to ErgoHeapSizeLimit
2012 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2013 }
2014 if (UseCompressedOops) {
2015 // Limit the heap size to the maximum possible when using compressed oops
2016 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2017
2018 // HeapBaseMinAddress can be greater than default but not less than.
2019 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2020 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2021 // matches compressed oops printing flags
2022 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2023 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2024 DefaultHeapBaseMinAddress,
2025 DefaultHeapBaseMinAddress/G,
2026 HeapBaseMinAddress);
2027 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2028 }
2029 }
2030
2031 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2032 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2033 // but it should be not less than default MaxHeapSize.
2034 max_coop_heap -= HeapBaseMinAddress;
2035 }
2036 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2037 }
2038 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2039
2040 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2041 // An initial heap size was specified on the command line,
2042 // so be sure that the maximum size is consistent. Done
2043 // after call to limit_by_allocatable_memory because that
2044 // method might reduce the allocation size.
2045 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2046 }
2047
2048 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2049 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2050 }
2051
2052 // If the minimum or initial heap_size have not been set or requested to be set
2053 // ergonomically, set them accordingly.
2054 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2055 julong reasonable_minimum = (julong)(OldSize + NewSize);
2056
2057 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2058
2059 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2060
2061 if (InitialHeapSize == 0) {
2062 julong reasonable_initial = phys_mem / InitialRAMFraction;
2063
2064 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2065 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2066
2067 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2068
2069 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2070 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2071 }
2072 // If the minimum heap size has not been set (via -Xms),
2073 // synchronize with InitialHeapSize to avoid errors with the default value.
2074 if (min_heap_size() == 0) {
2075 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2076 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2077 }
2078 }
2079 }
2080
2081 // This option inspects the machine and attempts to set various
2082 // parameters to be optimal for long-running, memory allocation
2083 // intensive jobs. It is intended for machines with large
2084 // amounts of cpu and memory.
2085 jint Arguments::set_aggressive_heap_flags() {
2086 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2087 // VM, but we may not be able to represent the total physical memory
2088 // available (like having 8gb of memory on a box but using a 32bit VM).
2089 // Thus, we need to make sure we're using a julong for intermediate
2090 // calculations.
2091 julong initHeapSize;
2092 julong total_memory = os::physical_memory();
2093
2094 if (total_memory < (julong) 256 * M) {
2095 jio_fprintf(defaultStream::error_stream(),
2096 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2097 vm_exit(1);
2098 }
2099
2100 // The heap size is half of available memory, or (at most)
2101 // all of possible memory less 160mb (leaving room for the OS
2102 // when using ISM). This is the maximum; because adaptive sizing
2103 // is turned on below, the actual space used may be smaller.
2104
2105 initHeapSize = MIN2(total_memory / (julong) 2,
2106 total_memory - (julong) 160 * M);
2107
2108 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2109
2110 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2111 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2112 return JNI_EINVAL;
2113 }
2114 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2115 return JNI_EINVAL;
2116 }
2117 // Currently the minimum size and the initial heap sizes are the same.
2118 set_min_heap_size(initHeapSize);
2119 }
2120 if (FLAG_IS_DEFAULT(NewSize)) {
2121 // Make the young generation 3/8ths of the total heap.
2122 if (FLAG_SET_CMDLINE(size_t, NewSize,
2123 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2124 return JNI_EINVAL;
2125 }
2126 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2127 return JNI_EINVAL;
2128 }
2129 }
2130
2131 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2132 FLAG_SET_DEFAULT(UseLargePages, true);
2133 #endif
2134
2135 // Increase some data structure sizes for efficiency
2136 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2137 return JNI_EINVAL;
2138 }
2139 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2140 return JNI_EINVAL;
2141 }
2142 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2143 return JNI_EINVAL;
2144 }
2145
2146 // See the OldPLABSize comment below, but replace 'after promotion'
2147 // with 'after copying'. YoungPLABSize is the size of the survivor
2148 // space per-gc-thread buffers. The default is 4kw.
2149 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2150 return JNI_EINVAL;
2151 }
2152
2153 // OldPLABSize is the size of the buffers in the old gen that
2154 // UseParallelGC uses to promote live data that doesn't fit in the
2155 // survivor spaces. At any given time, there's one for each gc thread.
2156 // The default size is 1kw. These buffers are rarely used, since the
2157 // survivor spaces are usually big enough. For specjbb, however, there
2158 // are occasions when there's lots of live data in the young gen
2159 // and we end up promoting some of it. We don't have a definite
2160 // explanation for why bumping OldPLABSize helps, but the theory
2161 // is that a bigger PLAB results in retaining something like the
2162 // original allocation order after promotion, which improves mutator
2163 // locality. A minor effect may be that larger PLABs reduce the
2164 // number of PLAB allocation events during gc. The value of 8kw
2165 // was arrived at by experimenting with specjbb.
2166 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2167 return JNI_EINVAL;
2168 }
2169
2170 // Enable parallel GC and adaptive generation sizing
2171 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2172 return JNI_EINVAL;
2173 }
2174 FLAG_SET_DEFAULT(ParallelGCThreads,
2175 Abstract_VM_Version::parallel_worker_threads());
2176
2177 // Encourage steady state memory management
2178 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2179 return JNI_EINVAL;
2180 }
2181
2182 // This appears to improve mutator locality
2183 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2184 return JNI_EINVAL;
2185 }
2186
2187 // Get around early Solaris scheduling bug
2188 // (affinity vs other jobs on system)
2189 // but disallow DR and offlining (5008695).
2190 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2191 return JNI_EINVAL;
2192 }
2193
2194 return JNI_OK;
2195 }
2196
2197 // This must be called after ergonomics.
2198 void Arguments::set_bytecode_flags() {
2199 if (!RewriteBytecodes) {
2200 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2201 }
2202 }
2203
2204 // Aggressive optimization flags -XX:+AggressiveOpts
2205 jint Arguments::set_aggressive_opts_flags() {
2206 #ifdef COMPILER2
2207 if (AggressiveUnboxing) {
2208 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2209 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2210 } else if (!EliminateAutoBox) {
2211 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2212 AggressiveUnboxing = false;
2213 }
2214 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2215 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2216 } else if (!DoEscapeAnalysis) {
2217 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2218 AggressiveUnboxing = false;
2219 }
2220 }
2221 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2222 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2223 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2224 }
2225 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2226 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2227 }
2228
2229 // Feed the cache size setting into the JDK
2230 char buffer[1024];
2231 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2232 if (!add_property(buffer)) {
2233 return JNI_ENOMEM;
2234 }
2235 }
2236 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2237 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2238 }
2239 #endif
2240
2241 if (AggressiveOpts) {
2242 // Sample flag setting code
2243 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2244 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2245 // }
2246 }
2247
2248 return JNI_OK;
2249 }
2250
2251 //===========================================================================================================
2252 // Parsing of java.compiler property
2253
2254 void Arguments::process_java_compiler_argument(const char* arg) {
2255 // For backwards compatibility, Djava.compiler=NONE or ""
2256 // causes us to switch to -Xint mode UNLESS -Xdebug
2257 // is also specified.
2258 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2259 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2260 }
2261 }
2262
2263 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2264 _sun_java_launcher = os::strdup_check_oom(launcher);
2265 }
2266
2267 bool Arguments::created_by_java_launcher() {
2268 assert(_sun_java_launcher != NULL, "property must have value");
2269 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2270 }
2271
2272 bool Arguments::sun_java_launcher_is_altjvm() {
2273 return _sun_java_launcher_is_altjvm;
2274 }
2275
2276 //===========================================================================================================
2277 // Parsing of main arguments
2278
2279 #if INCLUDE_JVMCI
2280 // Check consistency of jvmci vm argument settings.
2281 bool Arguments::check_jvmci_args_consistency() {
2282 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2283 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2284 return false;
2285 }
2286 return true;
2287 }
2288 #endif //INCLUDE_JVMCI
2289
2290 // Check consistency of GC selection
2291 bool Arguments::check_gc_consistency() {
2292 // Ensure that the user has not selected conflicting sets
2293 // of collectors.
2294 uint i = 0;
2295 if (UseSerialGC) i++;
2296 if (UseConcMarkSweepGC) i++;
2297 if (UseParallelGC || UseParallelOldGC) i++;
2298 if (UseG1GC) i++;
2299 if (i > 1) {
2300 jio_fprintf(defaultStream::error_stream(),
2301 "Conflicting collector combinations in option list; "
2302 "please refer to the release notes for the combinations "
2303 "allowed\n");
2304 return false;
2305 }
2306
2307 if (UseConcMarkSweepGC && !UseParNewGC) {
2308 jio_fprintf(defaultStream::error_stream(),
2309 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2310 return false;
2311 }
2312
2313 if (UseParNewGC && !UseConcMarkSweepGC) {
2314 jio_fprintf(defaultStream::error_stream(),
2315 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2316 return false;
2317 }
2318
2319 return true;
2320 }
2321
2322 // Check the consistency of vm_init_args
2323 bool Arguments::check_vm_args_consistency() {
2324 // Method for adding checks for flag consistency.
2325 // The intent is to warn the user of all possible conflicts,
2326 // before returning an error.
2327 // Note: Needs platform-dependent factoring.
2328 bool status = true;
2329
2330 if (TLABRefillWasteFraction == 0) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "TLABRefillWasteFraction should be a denominator, "
2333 "not " SIZE_FORMAT "\n",
2334 TLABRefillWasteFraction);
2335 status = false;
2336 }
2337
2338 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2339 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2340 }
2341
2342 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2343 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2344 }
2345
2346 if (GCTimeLimit == 100) {
2347 // Turn off gc-overhead-limit-exceeded checks
2348 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2349 }
2350
2351 status = status && check_gc_consistency();
2352
2353 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2354 // insists that we hold the requisite locks so that the iteration is
2355 // MT-safe. For the verification at start-up and shut-down, we don't
2356 // yet have a good way of acquiring and releasing these locks,
2357 // which are not visible at the CollectedHeap level. We want to
2358 // be able to acquire these locks and then do the iteration rather
2359 // than just disable the lock verification. This will be fixed under
2360 // bug 4788986.
2361 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2362 if (VerifyDuringStartup) {
2363 warning("Heap verification at start-up disabled "
2364 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2365 VerifyDuringStartup = false; // Disable verification at start-up
2366 }
2367
2368 if (VerifyBeforeExit) {
2369 warning("Heap verification at shutdown disabled "
2370 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2371 VerifyBeforeExit = false; // Disable verification at shutdown
2372 }
2373 }
2374
2375 if (PrintNMTStatistics) {
2376 #if INCLUDE_NMT
2377 if (MemTracker::tracking_level() == NMT_off) {
2378 #endif // INCLUDE_NMT
2379 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2380 PrintNMTStatistics = false;
2381 #if INCLUDE_NMT
2382 }
2383 #endif
2384 }
2385 #if INCLUDE_JVMCI
2386
2387 status = status && check_jvmci_args_consistency();
2388
2389 if (EnableJVMCI) {
2390 if (!ScavengeRootsInCode) {
2391 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2392 ScavengeRootsInCode = 1;
2393 }
2394 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2395 TypeProfileLevel = 0;
2396 }
2397 if (UseJVMCICompiler) {
2398 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2399 TypeProfileWidth = 8;
2400 }
2401 }
2402 }
2403 #endif
2404
2405 // Check lower bounds of the code cache
2406 // Template Interpreter code is approximately 3X larger in debug builds.
2407 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2408 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2409 jio_fprintf(defaultStream::error_stream(),
2410 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2411 os::vm_page_size()/K);
2412 status = false;
2413 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2414 jio_fprintf(defaultStream::error_stream(),
2415 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2416 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2417 status = false;
2418 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2419 jio_fprintf(defaultStream::error_stream(),
2420 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2421 min_code_cache_size/K);
2422 status = false;
2423 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2424 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2425 jio_fprintf(defaultStream::error_stream(),
2426 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2427 CODE_CACHE_SIZE_LIMIT/M);
2428 status = false;
2429 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2432 min_code_cache_size/K);
2433 status = false;
2434 }
2435
2436 #ifdef _LP64
2437 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2438 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2439 }
2440 #endif
2441
2442 #ifndef SUPPORT_RESERVED_STACK_AREA
2443 if (StackReservedPages != 0) {
2444 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2445 warning("Reserved Stack Area not supported on this platform");
2446 }
2447 #endif
2448
2449 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2450 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2451 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2452 }
2453 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2454 }
2455 if (UseCompiler && is_interpreter_only()) {
2456 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2457 warning("UseCompiler disabled due to -Xint.");
2458 }
2459 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2460 }
2461 #ifdef COMPILER2
2462 if (PostLoopMultiversioning && !RangeCheckElimination) {
2463 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2464 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2465 }
2466 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2467 }
2468 #endif
2469 return status;
2470 }
2471
2472 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2473 const char* option_type) {
2474 if (ignore) return false;
2475
2476 const char* spacer = " ";
2477 if (option_type == NULL) {
2478 option_type = ++spacer; // Set both to the empty string.
2479 }
2480
2481 if (os::obsolete_option(option)) {
2482 jio_fprintf(defaultStream::error_stream(),
2483 "Obsolete %s%soption: %s\n", option_type, spacer,
2484 option->optionString);
2485 return false;
2486 } else {
2487 jio_fprintf(defaultStream::error_stream(),
2488 "Unrecognized %s%soption: %s\n", option_type, spacer,
2489 option->optionString);
2490 return true;
2491 }
2492 }
2493
2494 static const char* user_assertion_options[] = {
2495 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2496 };
2497
2498 static const char* system_assertion_options[] = {
2499 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2500 };
2501
2502 bool Arguments::parse_uintx(const char* value,
2503 uintx* uintx_arg,
2504 uintx min_size) {
2505
2506 // Check the sign first since atojulong() parses only unsigned values.
2507 bool value_is_positive = !(*value == '-');
2508
2509 if (value_is_positive) {
2510 julong n;
2511 bool good_return = atojulong(value, &n);
2512 if (good_return) {
2513 bool above_minimum = n >= min_size;
2514 bool value_is_too_large = n > max_uintx;
2515
2516 if (above_minimum && !value_is_too_large) {
2517 *uintx_arg = n;
2518 return true;
2519 }
2520 }
2521 }
2522 return false;
2523 }
2524
2525 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2526 julong* long_arg,
2527 julong min_size) {
2528 if (!atojulong(s, long_arg)) return arg_unreadable;
2529 return check_memory_size(*long_arg, min_size);
2530 }
2531
2532 // Parse JavaVMInitArgs structure
2533
2534 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2535 const JavaVMInitArgs *java_options_args,
2536 const JavaVMInitArgs *cmd_line_args) {
2537 bool xpatch_javabase = false;
2538
2539 // Save default settings for some mode flags
2540 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2541 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2542 Arguments::_ClipInlining = ClipInlining;
2543 Arguments::_BackgroundCompilation = BackgroundCompilation;
2544 if (TieredCompilation) {
2545 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2546 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2547 }
2548
2549 // Setup flags for mixed which is the default
2550 set_mode_flags(_mixed);
2551
2552 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2553 // variable (if present).
2554 jint result = parse_each_vm_init_arg(java_tool_options_args, &xpatch_javabase, Flag::ENVIRON_VAR);
2555 if (result != JNI_OK) {
2556 return result;
2557 }
2558
2559 // Parse args structure generated from the command line flags.
2560 result = parse_each_vm_init_arg(cmd_line_args, &xpatch_javabase, Flag::COMMAND_LINE);
2561 if (result != JNI_OK) {
2562 return result;
2563 }
2564
2565 // Parse args structure generated from the _JAVA_OPTIONS environment
2566 // variable (if present) (mimics classic VM)
2567 result = parse_each_vm_init_arg(java_options_args, &xpatch_javabase, Flag::ENVIRON_VAR);
2568 if (result != JNI_OK) {
2569 return result;
2570 }
2571
2572 // Do final processing now that all arguments have been parsed
2573 result = finalize_vm_init_args();
2574 if (result != JNI_OK) {
2575 return result;
2576 }
2577
2578 return JNI_OK;
2579 }
2580
2581 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2582 // represents a valid JDWP agent. is_path==true denotes that we
2583 // are dealing with -agentpath (case where name is a path), otherwise with
2584 // -agentlib
2585 bool valid_jdwp_agent(char *name, bool is_path) {
2586 char *_name;
2587 const char *_jdwp = "jdwp";
2588 size_t _len_jdwp, _len_prefix;
2589
2590 if (is_path) {
2591 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2592 return false;
2593 }
2594
2595 _name++; // skip past last path separator
2596 _len_prefix = strlen(JNI_LIB_PREFIX);
2597
2598 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2599 return false;
2600 }
2601
2602 _name += _len_prefix;
2603 _len_jdwp = strlen(_jdwp);
2604
2605 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2606 _name += _len_jdwp;
2607 }
2608 else {
2609 return false;
2610 }
2611
2612 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2613 return false;
2614 }
2615
2616 return true;
2617 }
2618
2619 if (strcmp(name, _jdwp) == 0) {
2620 return true;
2621 }
2622
2623 return false;
2624 }
2625
2626 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* xpatch_javabase, Flag::Flags origin) {
2627 // For match_option to return remaining or value part of option string
2628 const char* tail;
2629
2630 // iterate over arguments
2631 for (int index = 0; index < args->nOptions; index++) {
2632 bool is_absolute_path = false; // for -agentpath vs -agentlib
2633
2634 const JavaVMOption* option = args->options + index;
2635
2636 if (!match_option(option, "-Djava.class.path", &tail) &&
2637 !match_option(option, "-Dsun.java.command", &tail) &&
2638 !match_option(option, "-Dsun.java.launcher", &tail)) {
2639
2640 // add all jvm options to the jvm_args string. This string
2641 // is used later to set the java.vm.args PerfData string constant.
2642 // the -Djava.class.path and the -Dsun.java.command options are
2643 // omitted from jvm_args string as each have their own PerfData
2644 // string constant object.
2645 build_jvm_args(option->optionString);
2646 }
2647
2648 // -verbose:[class/gc/jni]
2649 if (match_option(option, "-verbose", &tail)) {
2650 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2651 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2652 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2653 } else if (!strcmp(tail, ":gc")) {
2654 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2655 } else if (!strcmp(tail, ":jni")) {
2656 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2657 return JNI_EINVAL;
2658 }
2659 }
2660 // -da / -ea / -disableassertions / -enableassertions
2661 // These accept an optional class/package name separated by a colon, e.g.,
2662 // -da:java.lang.Thread.
2663 } else if (match_option(option, user_assertion_options, &tail, true)) {
2664 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2665 if (*tail == '\0') {
2666 JavaAssertions::setUserClassDefault(enable);
2667 } else {
2668 assert(*tail == ':', "bogus match by match_option()");
2669 JavaAssertions::addOption(tail + 1, enable);
2670 }
2671 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2672 } else if (match_option(option, system_assertion_options, &tail, false)) {
2673 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2674 JavaAssertions::setSystemClassDefault(enable);
2675 // -bootclasspath:
2676 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2677 jio_fprintf(defaultStream::output_stream(),
2678 "-Xbootclasspath is no longer a supported option.\n");
2679 return JNI_EINVAL;
2680 // -bootclasspath/a:
2681 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2682 Arguments::set_bootclassloader_append_index((int)strlen(Arguments::get_sysclasspath())+1);
2683 Arguments::append_sysclasspath(tail);
2684 // -bootclasspath/p:
2685 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2686 jio_fprintf(defaultStream::output_stream(),
2687 "-Xbootclasspath/p is no longer a supported option.\n");
2688 return JNI_EINVAL;
2689 // -Xrun
2690 } else if (match_option(option, "-Xrun", &tail)) {
2691 if (tail != NULL) {
2692 const char* pos = strchr(tail, ':');
2693 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2694 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2695 name[len] = '\0';
2696
2697 char *options = NULL;
2698 if(pos != NULL) {
2699 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2700 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2701 }
2702 #if !INCLUDE_JVMTI
2703 if (strcmp(name, "jdwp") == 0) {
2704 jio_fprintf(defaultStream::error_stream(),
2705 "Debugging agents are not supported in this VM\n");
2706 return JNI_ERR;
2707 }
2708 #endif // !INCLUDE_JVMTI
2709 add_init_library(name, options);
2710 }
2711 // -agentlib and -agentpath
2712 } else if (match_option(option, "-agentlib:", &tail) ||
2713 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2714 if(tail != NULL) {
2715 const char* pos = strchr(tail, '=');
2716 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2717 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2718 name[len] = '\0';
2719
2720 char *options = NULL;
2721 if(pos != NULL) {
2722 options = os::strdup_check_oom(pos + 1, mtArguments);
2723 }
2724 #if !INCLUDE_JVMTI
2725 if (valid_jdwp_agent(name, is_absolute_path)) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "Debugging agents are not supported in this VM\n");
2728 return JNI_ERR;
2729 }
2730 #endif // !INCLUDE_JVMTI
2731 add_init_agent(name, options, is_absolute_path);
2732 }
2733 // -javaagent
2734 } else if (match_option(option, "-javaagent:", &tail)) {
2735 #if !INCLUDE_JVMTI
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Instrumentation agents are not supported in this VM\n");
2738 return JNI_ERR;
2739 #else
2740 if (tail != NULL) {
2741 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2742 add_init_agent("instrument", options, false);
2743 // java agents need module java.instrument
2744 if (!Arguments::append_to_addmods_property("java.instrument")) {
2745 return JNI_ENOMEM;
2746 }
2747 }
2748 #endif // !INCLUDE_JVMTI
2749 // -Xnoclassgc
2750 } else if (match_option(option, "-Xnoclassgc")) {
2751 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 // -Xconcgc
2755 } else if (match_option(option, "-Xconcgc")) {
2756 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 // -Xnoconcgc
2760 } else if (match_option(option, "-Xnoconcgc")) {
2761 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 // -Xbatch
2765 } else if (match_option(option, "-Xbatch")) {
2766 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 // -Xmn for compatibility with other JVM vendors
2770 } else if (match_option(option, "-Xmn", &tail)) {
2771 julong long_initial_young_size = 0;
2772 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2773 if (errcode != arg_in_range) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Invalid initial young generation size: %s\n", option->optionString);
2776 describe_range_error(errcode);
2777 return JNI_EINVAL;
2778 }
2779 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2780 return JNI_EINVAL;
2781 }
2782 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2783 return JNI_EINVAL;
2784 }
2785 // -Xms
2786 } else if (match_option(option, "-Xms", &tail)) {
2787 julong long_initial_heap_size = 0;
2788 // an initial heap size of 0 means automatically determine
2789 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2790 if (errcode != arg_in_range) {
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Invalid initial heap size: %s\n", option->optionString);
2793 describe_range_error(errcode);
2794 return JNI_EINVAL;
2795 }
2796 set_min_heap_size((size_t)long_initial_heap_size);
2797 // Currently the minimum size and the initial heap sizes are the same.
2798 // Can be overridden with -XX:InitialHeapSize.
2799 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2800 return JNI_EINVAL;
2801 }
2802 // -Xmx
2803 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2804 julong long_max_heap_size = 0;
2805 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2806 if (errcode != arg_in_range) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Invalid maximum heap size: %s\n", option->optionString);
2809 describe_range_error(errcode);
2810 return JNI_EINVAL;
2811 }
2812 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 // Xmaxf
2816 } else if (match_option(option, "-Xmaxf", &tail)) {
2817 char* err;
2818 int maxf = (int)(strtod(tail, &err) * 100);
2819 if (*err != '\0' || *tail == '\0') {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "Bad max heap free percentage size: %s\n",
2822 option->optionString);
2823 return JNI_EINVAL;
2824 } else {
2825 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 }
2829 // Xminf
2830 } else if (match_option(option, "-Xminf", &tail)) {
2831 char* err;
2832 int minf = (int)(strtod(tail, &err) * 100);
2833 if (*err != '\0' || *tail == '\0') {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Bad min heap free percentage size: %s\n",
2836 option->optionString);
2837 return JNI_EINVAL;
2838 } else {
2839 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2840 return JNI_EINVAL;
2841 }
2842 }
2843 // -Xss
2844 } else if (match_option(option, "-Xss", &tail)) {
2845 julong long_ThreadStackSize = 0;
2846 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2847 if (errcode != arg_in_range) {
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Invalid thread stack size: %s\n", option->optionString);
2850 describe_range_error(errcode);
2851 return JNI_EINVAL;
2852 }
2853 // Internally track ThreadStackSize in units of 1024 bytes.
2854 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2855 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2856 return JNI_EINVAL;
2857 }
2858 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2859 } else if (match_option(option, "-Xoss", &tail) ||
2860 match_option(option, "-Xsqnopause") ||
2861 match_option(option, "-Xoptimize") ||
2862 match_option(option, "-Xboundthreads") ||
2863 match_option(option, "-Xusealtsigs")) {
2864 // All these options are deprecated in JDK 9 and will be removed in a future release
2865 char version[256];
2866 JDK_Version::jdk(9).to_string(version, sizeof(version));
2867 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2868 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2869 julong long_CodeCacheExpansionSize = 0;
2870 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2871 if (errcode != arg_in_range) {
2872 jio_fprintf(defaultStream::error_stream(),
2873 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2874 os::vm_page_size()/K);
2875 return JNI_EINVAL;
2876 }
2877 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2881 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2882 julong long_ReservedCodeCacheSize = 0;
2883
2884 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2885 if (errcode != arg_in_range) {
2886 jio_fprintf(defaultStream::error_stream(),
2887 "Invalid maximum code cache size: %s.\n", option->optionString);
2888 return JNI_EINVAL;
2889 }
2890 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2891 return JNI_EINVAL;
2892 }
2893 // -XX:NonNMethodCodeHeapSize=
2894 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2895 julong long_NonNMethodCodeHeapSize = 0;
2896
2897 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2898 if (errcode != arg_in_range) {
2899 jio_fprintf(defaultStream::error_stream(),
2900 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2901 return JNI_EINVAL;
2902 }
2903 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 // -XX:ProfiledCodeHeapSize=
2907 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2908 julong long_ProfiledCodeHeapSize = 0;
2909
2910 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2911 if (errcode != arg_in_range) {
2912 jio_fprintf(defaultStream::error_stream(),
2913 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2914 return JNI_EINVAL;
2915 }
2916 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2917 return JNI_EINVAL;
2918 }
2919 // -XX:NonProfiledCodeHeapSizee=
2920 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2921 julong long_NonProfiledCodeHeapSize = 0;
2922
2923 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2924 if (errcode != arg_in_range) {
2925 jio_fprintf(defaultStream::error_stream(),
2926 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2927 return JNI_EINVAL;
2928 }
2929 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 // -green
2933 } else if (match_option(option, "-green")) {
2934 jio_fprintf(defaultStream::error_stream(),
2935 "Green threads support not available\n");
2936 return JNI_EINVAL;
2937 // -native
2938 } else if (match_option(option, "-native")) {
2939 // HotSpot always uses native threads, ignore silently for compatibility
2940 // -Xrs
2941 } else if (match_option(option, "-Xrs")) {
2942 // Classic/EVM option, new functionality
2943 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 // -Xprof
2947 } else if (match_option(option, "-Xprof")) {
2948 #if INCLUDE_FPROF
2949 _has_profile = true;
2950 #else // INCLUDE_FPROF
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Flat profiling is not supported in this VM.\n");
2953 return JNI_ERR;
2954 #endif // INCLUDE_FPROF
2955 // -Xconcurrentio
2956 } else if (match_option(option, "-Xconcurrentio")) {
2957 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2958 return JNI_EINVAL;
2959 }
2960 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2967 return JNI_EINVAL;
2968 }
2969 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2970 return JNI_EINVAL;
2971 }
2972
2973 // -Xinternalversion
2974 } else if (match_option(option, "-Xinternalversion")) {
2975 jio_fprintf(defaultStream::output_stream(), "%s\n",
2976 VM_Version::internal_vm_info_string());
2977 vm_exit(0);
2978 #ifndef PRODUCT
2979 // -Xprintflags
2980 } else if (match_option(option, "-Xprintflags")) {
2981 CommandLineFlags::printFlags(tty, false);
2982 vm_exit(0);
2983 #endif
2984 // -D
2985 } else if (match_option(option, "-D", &tail)) {
2986 const char* value;
2987 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2988 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2989 // abort if -Djava.endorsed.dirs is set
2990 jio_fprintf(defaultStream::output_stream(),
2991 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2992 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2993 return JNI_EINVAL;
2994 }
2995 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2996 *value != '\0' && strcmp(value, "\"\"") != 0) {
2997 // abort if -Djava.ext.dirs is set
2998 jio_fprintf(defaultStream::output_stream(),
2999 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3000 return JNI_EINVAL;
3001 }
3002
3003 if (!add_property(tail)) {
3004 return JNI_ENOMEM;
3005 }
3006 // Out of the box management support
3007 if (match_option(option, "-Dcom.sun.management", &tail)) {
3008 #if INCLUDE_MANAGEMENT
3009 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3010 return JNI_EINVAL;
3011 }
3012 // management agent in module java.management
3013 if (!Arguments::append_to_addmods_property("java.management")) {
3014 return JNI_ENOMEM;
3015 }
3016 #else
3017 jio_fprintf(defaultStream::output_stream(),
3018 "-Dcom.sun.management is not supported in this VM.\n");
3019 return JNI_ERR;
3020 #endif
3021 }
3022 if (match_option(option, "-Djdk.launcher.patch.", &tail)) {
3023 // -Djdk.launcher.patch.#=<module>=<file>(<pathsep><file>)*
3024 // The number, #, specified will be increasing with each -Xpatch
3025 // specified on the command line.
3026 // Pick up module name, following the -D property's equal sign.
3027 const char* property_equal = strchr(tail, '=');
3028 if (property_equal == NULL) {
3029 jio_fprintf(defaultStream::output_stream(), "Missing '=' in -Xpatch specification\n");
3030 return JNI_ERR;
3031 } else {
3032 // Find the equal sign between the module name and the path specification
3033 const char* module_equal = strchr(property_equal + 1, '=');
3034 if (module_equal == NULL) {
3035 jio_fprintf(defaultStream::output_stream(), "Bad value for -Xpatch, no module name specified\n");
3036 return JNI_ERR;
3037 } else {
3038 // Pick out the module name, in between the two equal signs
3039 size_t module_len = module_equal - property_equal - 1;
3040 char* module_name = NEW_C_HEAP_ARRAY(char, module_len+1, mtArguments);
3041 memcpy(module_name, property_equal + 1, module_len);
3042 *(module_name + module_len) = '\0';
3043 // The path piece begins one past the module_equal sign
3044 Arguments::add_xpatchprefix(module_name, module_equal + 1, xpatch_javabase);
3045 FREE_C_HEAP_ARRAY(char, module_name);
3046 }
3047 }
3048 }
3049 // -Xint
3050 } else if (match_option(option, "-Xint")) {
3051 set_mode_flags(_int);
3052 // -Xmixed
3053 } else if (match_option(option, "-Xmixed")) {
3054 set_mode_flags(_mixed);
3055 // -Xcomp
3056 } else if (match_option(option, "-Xcomp")) {
3057 // for testing the compiler; turn off all flags that inhibit compilation
3058 set_mode_flags(_comp);
3059 // -Xshare:dump
3060 } else if (match_option(option, "-Xshare:dump")) {
3061 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3062 return JNI_EINVAL;
3063 }
3064 set_mode_flags(_int); // Prevent compilation, which creates objects
3065 // -Xshare:on
3066 } else if (match_option(option, "-Xshare:on")) {
3067 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 // -Xshare:auto
3074 } else if (match_option(option, "-Xshare:auto")) {
3075 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3076 return JNI_EINVAL;
3077 }
3078 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3079 return JNI_EINVAL;
3080 }
3081 // -Xshare:off
3082 } else if (match_option(option, "-Xshare:off")) {
3083 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3084 return JNI_EINVAL;
3085 }
3086 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3087 return JNI_EINVAL;
3088 }
3089 // -Xverify
3090 } else if (match_option(option, "-Xverify", &tail)) {
3091 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3092 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3093 return JNI_EINVAL;
3094 }
3095 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3096 return JNI_EINVAL;
3097 }
3098 } else if (strcmp(tail, ":remote") == 0) {
3099 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3100 return JNI_EINVAL;
3101 }
3102 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3103 return JNI_EINVAL;
3104 }
3105 } else if (strcmp(tail, ":none") == 0) {
3106 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3107 return JNI_EINVAL;
3108 }
3109 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3110 return JNI_EINVAL;
3111 }
3112 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3113 return JNI_EINVAL;
3114 }
3115 // -Xdebug
3116 } else if (match_option(option, "-Xdebug")) {
3117 // note this flag has been used, then ignore
3118 set_xdebug_mode(true);
3119 // -Xnoagent
3120 } else if (match_option(option, "-Xnoagent")) {
3121 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3122 } else if (match_option(option, "-Xloggc:", &tail)) {
3123 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3124 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3125 _gc_log_filename = os::strdup_check_oom(tail);
3126 } else if (match_option(option, "-Xlog", &tail)) {
3127 bool ret = false;
3128 if (strcmp(tail, ":help") == 0) {
3129 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3130 vm_exit(0);
3131 } else if (strcmp(tail, ":disable") == 0) {
3132 LogConfiguration::disable_logging();
3133 ret = true;
3134 } else if (*tail == '\0') {
3135 ret = LogConfiguration::parse_command_line_arguments();
3136 assert(ret, "-Xlog without arguments should never fail to parse");
3137 } else if (*tail == ':') {
3138 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3139 }
3140 if (ret == false) {
3141 jio_fprintf(defaultStream::error_stream(),
3142 "Invalid -Xlog option '-Xlog%s'\n",
3143 tail);
3144 return JNI_EINVAL;
3145 }
3146 // JNI hooks
3147 } else if (match_option(option, "-Xcheck", &tail)) {
3148 if (!strcmp(tail, ":jni")) {
3149 #if !INCLUDE_JNI_CHECK
3150 warning("JNI CHECKING is not supported in this VM");
3151 #else
3152 CheckJNICalls = true;
3153 #endif // INCLUDE_JNI_CHECK
3154 } else if (is_bad_option(option, args->ignoreUnrecognized,
3155 "check")) {
3156 return JNI_EINVAL;
3157 }
3158 } else if (match_option(option, "vfprintf")) {
3159 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3160 } else if (match_option(option, "exit")) {
3161 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3162 } else if (match_option(option, "abort")) {
3163 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3164 // -XX:+AggressiveHeap
3165 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3166 jint result = set_aggressive_heap_flags();
3167 if (result != JNI_OK) {
3168 return result;
3169 }
3170 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3171 // and the last option wins.
3172 } else if (match_option(option, "-XX:+NeverTenure")) {
3173 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3174 return JNI_EINVAL;
3175 }
3176 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3177 return JNI_EINVAL;
3178 }
3179 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3180 return JNI_EINVAL;
3181 }
3182 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3183 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3184 return JNI_EINVAL;
3185 }
3186 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3187 return JNI_EINVAL;
3188 }
3189 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3193 uintx max_tenuring_thresh = 0;
3194 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3195 jio_fprintf(defaultStream::error_stream(),
3196 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3197 return JNI_EINVAL;
3198 }
3199
3200 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3201 return JNI_EINVAL;
3202 }
3203
3204 if (MaxTenuringThreshold == 0) {
3205 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3206 return JNI_EINVAL;
3207 }
3208 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 } else {
3212 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3213 return JNI_EINVAL;
3214 }
3215 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3216 return JNI_EINVAL;
3217 }
3218 }
3219 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3220 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3221 return JNI_EINVAL;
3222 }
3223 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3224 return JNI_EINVAL;
3225 }
3226 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3227 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3228 return JNI_EINVAL;
3229 }
3230 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3231 return JNI_EINVAL;
3232 }
3233 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3234 #if defined(DTRACE_ENABLED)
3235 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3236 return JNI_EINVAL;
3237 }
3238 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3239 return JNI_EINVAL;
3240 }
3241 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3242 return JNI_EINVAL;
3243 }
3244 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3245 return JNI_EINVAL;
3246 }
3247 #else // defined(DTRACE_ENABLED)
3248 jio_fprintf(defaultStream::error_stream(),
3249 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3250 return JNI_EINVAL;
3251 #endif // defined(DTRACE_ENABLED)
3252 #ifdef ASSERT
3253 } else if (match_option(option, "-XX:+FullGCALot")) {
3254 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3255 return JNI_EINVAL;
3256 }
3257 // disable scavenge before parallel mark-compact
3258 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3259 return JNI_EINVAL;
3260 }
3261 #endif
3262 #if !INCLUDE_MANAGEMENT
3263 } else if (match_option(option, "-XX:+ManagementServer")) {
3264 jio_fprintf(defaultStream::error_stream(),
3265 "ManagementServer is not supported in this VM.\n");
3266 return JNI_ERR;
3267 #endif // INCLUDE_MANAGEMENT
3268 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3269 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3270 // already been handled
3271 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3272 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3273 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3274 return JNI_EINVAL;
3275 }
3276 }
3277 // Unknown option
3278 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3279 return JNI_ERR;
3280 }
3281 }
3282
3283 // PrintSharedArchiveAndExit will turn on
3284 // -Xshare:on
3285 // -Xlog:class+path=info
3286 if (PrintSharedArchiveAndExit) {
3287 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3288 return JNI_EINVAL;
3289 }
3290 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3291 return JNI_EINVAL;
3292 }
3293 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3294 }
3295
3296 // Change the default value for flags which have different default values
3297 // when working with older JDKs.
3298 #ifdef LINUX
3299 if (JDK_Version::current().compare_major(6) <= 0 &&
3300 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3301 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3302 }
3303 #endif // LINUX
3304 fix_appclasspath();
3305 return JNI_OK;
3306 }
3307
3308 void Arguments::add_xpatchprefix(const char* module_name, const char* path, bool* xpatch_javabase) {
3309 // For java.base check for duplicate -Xpatch options being specified on the command line.
3310 // This check is only required for java.base, all other duplicate module specifications
3311 // will be checked during module system initialization. The module system initialization
3312 // will throw an ExceptionInInitializerError if this situation occurs.
3313 if (strcmp(module_name, "java.base") == 0) {
3314 if (*xpatch_javabase) {
3315 vm_exit_during_initialization("Cannot specify java.base more than once to -Xpatch");
3316 } else {
3317 *xpatch_javabase = true;
3318 }
3319 }
3320
3321 // Create GrowableArray lazily, only if -Xpatch has been specified
3322 if (_xpatchprefix == NULL) {
3323 _xpatchprefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModuleXPatchPath*>(10, true);
3324 }
3325
3326 _xpatchprefix->push(new ModuleXPatchPath(module_name, path));
3327 }
3328
3329 // Set property jdk.boot.class.path.append to the contents of the bootclasspath
3330 // that follows either the jimage file or exploded module directories. The
3331 // property will contain -Xbootclasspath/a and/or jvmti appended additions.
3332 void Arguments::set_jdkbootclasspath_append() {
3333 char *sysclasspath = get_sysclasspath();
3334 assert(sysclasspath != NULL, "NULL sysclasspath");
3335 int bcp_a_idx = bootclassloader_append_index();
3336 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) {
3337 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx);
3338 }
3339 }
3340
3341 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3342 //
3343 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3344 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3345 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3346 // path is treated as the current directory.
3347 //
3348 // This causes problems with CDS, which requires that all directories specified in the classpath
3349 // must be empty. In most cases, applications do NOT want to load classes from the current
3350 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3351 // scripts compatible with CDS.
3352 void Arguments::fix_appclasspath() {
3353 if (IgnoreEmptyClassPaths) {
3354 const char separator = *os::path_separator();
3355 const char* src = _java_class_path->value();
3356
3357 // skip over all the leading empty paths
3358 while (*src == separator) {
3359 src ++;
3360 }
3361
3362 char* copy = os::strdup_check_oom(src, mtArguments);
3363
3364 // trim all trailing empty paths
3365 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3366 *tail = '\0';
3367 }
3368
3369 char from[3] = {separator, separator, '\0'};
3370 char to [2] = {separator, '\0'};
3371 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3372 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3373 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3374 }
3375
3376 _java_class_path->set_writeable_value(copy);
3377 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3378 }
3379 }
3380
3381 static bool has_jar_files(const char* directory) {
3382 DIR* dir = os::opendir(directory);
3383 if (dir == NULL) return false;
3384
3385 struct dirent *entry;
3386 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3387 bool hasJarFile = false;
3388 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3389 const char* name = entry->d_name;
3390 const char* ext = name + strlen(name) - 4;
3391 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3392 }
3393 FREE_C_HEAP_ARRAY(char, dbuf);
3394 os::closedir(dir);
3395 return hasJarFile ;
3396 }
3397
3398 static int check_non_empty_dirs(const char* path) {
3399 const char separator = *os::path_separator();
3400 const char* const end = path + strlen(path);
3401 int nonEmptyDirs = 0;
3402 while (path < end) {
3403 const char* tmp_end = strchr(path, separator);
3404 if (tmp_end == NULL) {
3405 if (has_jar_files(path)) {
3406 nonEmptyDirs++;
3407 jio_fprintf(defaultStream::output_stream(),
3408 "Non-empty directory: %s\n", path);
3409 }
3410 path = end;
3411 } else {
3412 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3413 memcpy(dirpath, path, tmp_end - path);
3414 dirpath[tmp_end - path] = '\0';
3415 if (has_jar_files(dirpath)) {
3416 nonEmptyDirs++;
3417 jio_fprintf(defaultStream::output_stream(),
3418 "Non-empty directory: %s\n", dirpath);
3419 }
3420 FREE_C_HEAP_ARRAY(char, dirpath);
3421 path = tmp_end + 1;
3422 }
3423 }
3424 return nonEmptyDirs;
3425 }
3426
3427 jint Arguments::finalize_vm_init_args() {
3428 // check if the default lib/endorsed directory exists; if so, error
3429 char path[JVM_MAXPATHLEN];
3430 const char* fileSep = os::file_separator();
3431 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3432
3433 if (CheckEndorsedAndExtDirs) {
3434 int nonEmptyDirs = 0;
3435 // check endorsed directory
3436 nonEmptyDirs += check_non_empty_dirs(path);
3437 // check the extension directories
3438 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3439 if (nonEmptyDirs > 0) {
3440 return JNI_ERR;
3441 }
3442 }
3443
3444 DIR* dir = os::opendir(path);
3445 if (dir != NULL) {
3446 jio_fprintf(defaultStream::output_stream(),
3447 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3448 "in modular form will be supported via the concept of upgradeable modules.\n");
3449 os::closedir(dir);
3450 return JNI_ERR;
3451 }
3452
3453 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3454 dir = os::opendir(path);
3455 if (dir != NULL) {
3456 jio_fprintf(defaultStream::output_stream(),
3457 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3458 "Use -classpath instead.\n.");
3459 os::closedir(dir);
3460 return JNI_ERR;
3461 }
3462
3463 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1);
3464
3465 // This must be done after all arguments have been processed.
3466 // java_compiler() true means set to "NONE" or empty.
3467 if (java_compiler() && !xdebug_mode()) {
3468 // For backwards compatibility, we switch to interpreted mode if
3469 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3470 // not specified.
3471 set_mode_flags(_int);
3472 }
3473
3474 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3475 // but like -Xint, leave compilation thresholds unaffected.
3476 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3477 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3478 set_mode_flags(_int);
3479 }
3480
3481 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3482 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3483 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3484 }
3485
3486 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3487 // Don't degrade server performance for footprint
3488 if (FLAG_IS_DEFAULT(UseLargePages) &&
3489 MaxHeapSize < LargePageHeapSizeThreshold) {
3490 // No need for large granularity pages w/small heaps.
3491 // Note that large pages are enabled/disabled for both the
3492 // Java heap and the code cache.
3493 FLAG_SET_DEFAULT(UseLargePages, false);
3494 }
3495
3496 #elif defined(COMPILER2)
3497 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3498 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3499 }
3500 #endif
3501
3502 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3503 UNSUPPORTED_OPTION(ProfileInterpreter);
3504 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3505 #endif
3506
3507 #ifndef TIERED
3508 // Tiered compilation is undefined.
3509 UNSUPPORTED_OPTION(TieredCompilation);
3510 #endif
3511
3512 #if INCLUDE_JVMCI
3513 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) {
3514 return JNI_ENOMEM;
3515 }
3516 #endif
3517
3518 // If we are running in a headless jre, force java.awt.headless property
3519 // to be true unless the property has already been set.
3520 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3521 if (os::is_headless_jre()) {
3522 const char* headless = Arguments::get_property("java.awt.headless");
3523 if (headless == NULL) {
3524 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3525 if (headless_env == NULL) {
3526 if (!add_property("java.awt.headless=true")) {
3527 return JNI_ENOMEM;
3528 }
3529 } else {
3530 char buffer[256];
3531 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3532 if (!add_property(buffer)) {
3533 return JNI_ENOMEM;
3534 }
3535 }
3536 }
3537 }
3538
3539 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3540 // CMS can only be used with ParNew
3541 FLAG_SET_ERGO(bool, UseParNewGC, true);
3542 }
3543
3544 if (!check_vm_args_consistency()) {
3545 return JNI_ERR;
3546 }
3547
3548 if (!FLAG_IS_DEFAULT(FSDirForHeap)) {
3549 FLAG_SET_CMDLINE(bool, ForceNUMA, false);
3550 FLAG_SET_CMDLINE(bool, UseNUMA, false);
3551 }
3552
3553 return JNI_OK;
3554 }
3555
3556 // Helper class for controlling the lifetime of JavaVMInitArgs
3557 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3558 // deleted on the destruction of the ScopedVMInitArgs object.
3559 class ScopedVMInitArgs : public StackObj {
3560 private:
3561 JavaVMInitArgs _args;
3562 char* _container_name;
3563 bool _is_set;
3564 char* _vm_options_file_arg;
3565
3566 public:
3567 ScopedVMInitArgs(const char *container_name) {
3568 _args.version = JNI_VERSION_1_2;
3569 _args.nOptions = 0;
3570 _args.options = NULL;
3571 _args.ignoreUnrecognized = false;
3572 _container_name = (char *)container_name;
3573 _is_set = false;
3574 _vm_options_file_arg = NULL;
3575 }
3576
3577 // Populates the JavaVMInitArgs object represented by this
3578 // ScopedVMInitArgs object with the arguments in options. The
3579 // allocated memory is deleted by the destructor. If this method
3580 // returns anything other than JNI_OK, then this object is in a
3581 // partially constructed state, and should be abandoned.
3582 jint set_args(GrowableArray<JavaVMOption>* options) {
3583 _is_set = true;
3584 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3585 JavaVMOption, options->length(), mtArguments);
3586 if (options_arr == NULL) {
3587 return JNI_ENOMEM;
3588 }
3589 _args.options = options_arr;
3590
3591 for (int i = 0; i < options->length(); i++) {
3592 options_arr[i] = options->at(i);
3593 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3594 if (options_arr[i].optionString == NULL) {
3595 // Rely on the destructor to do cleanup.
3596 _args.nOptions = i;
3597 return JNI_ENOMEM;
3598 }
3599 }
3600
3601 _args.nOptions = options->length();
3602 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3603 return JNI_OK;
3604 }
3605
3606 JavaVMInitArgs* get() { return &_args; }
3607 char* container_name() { return _container_name; }
3608 bool is_set() { return _is_set; }
3609 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3610 char* vm_options_file_arg() { return _vm_options_file_arg; }
3611
3612 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3613 if (_vm_options_file_arg != NULL) {
3614 os::free(_vm_options_file_arg);
3615 }
3616 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3617 }
3618
3619 ~ScopedVMInitArgs() {
3620 if (_vm_options_file_arg != NULL) {
3621 os::free(_vm_options_file_arg);
3622 }
3623 if (_args.options == NULL) return;
3624 for (int i = 0; i < _args.nOptions; i++) {
3625 os::free(_args.options[i].optionString);
3626 }
3627 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3628 }
3629
3630 // Insert options into this option list, to replace option at
3631 // vm_options_file_pos (-XX:VMOptionsFile)
3632 jint insert(const JavaVMInitArgs* args,
3633 const JavaVMInitArgs* args_to_insert,
3634 const int vm_options_file_pos) {
3635 assert(_args.options == NULL, "shouldn't be set yet");
3636 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3637 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3638
3639 int length = args->nOptions + args_to_insert->nOptions - 1;
3640 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3641 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3642 for (int i = 0; i < args->nOptions; i++) {
3643 if (i == vm_options_file_pos) {
3644 // insert the new options starting at the same place as the
3645 // -XX:VMOptionsFile option
3646 for (int j = 0; j < args_to_insert->nOptions; j++) {
3647 options->push(args_to_insert->options[j]);
3648 }
3649 } else {
3650 options->push(args->options[i]);
3651 }
3652 }
3653 // make into options array
3654 jint result = set_args(options);
3655 delete options;
3656 return result;
3657 }
3658 };
3659
3660 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3661 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3662 }
3663
3664 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3665 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3666 }
3667
3668 jint Arguments::parse_options_environment_variable(const char* name,
3669 ScopedVMInitArgs* vm_args) {
3670 char *buffer = ::getenv(name);
3671
3672 // Don't check this environment variable if user has special privileges
3673 // (e.g. unix su command).
3674 if (buffer == NULL || os::have_special_privileges()) {
3675 return JNI_OK;
3676 }
3677
3678 if ((buffer = os::strdup(buffer)) == NULL) {
3679 return JNI_ENOMEM;
3680 }
3681
3682 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3683
3684 os::free(buffer);
3685 return retcode;
3686 }
3687
3688 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3689 // read file into buffer
3690 int fd = ::open(file_name, O_RDONLY);
3691 if (fd < 0) {
3692 jio_fprintf(defaultStream::error_stream(),
3693 "Could not open options file '%s'\n",
3694 file_name);
3695 return JNI_ERR;
3696 }
3697
3698 struct stat stbuf;
3699 int retcode = os::stat(file_name, &stbuf);
3700 if (retcode != 0) {
3701 jio_fprintf(defaultStream::error_stream(),
3702 "Could not stat options file '%s'\n",
3703 file_name);
3704 os::close(fd);
3705 return JNI_ERR;
3706 }
3707
3708 if (stbuf.st_size == 0) {
3709 // tell caller there is no option data and that is ok
3710 os::close(fd);
3711 return JNI_OK;
3712 }
3713
3714 // '+ 1' for NULL termination even with max bytes
3715 size_t bytes_alloc = stbuf.st_size + 1;
3716
3717 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3718 if (NULL == buf) {
3719 jio_fprintf(defaultStream::error_stream(),
3720 "Could not allocate read buffer for options file parse\n");
3721 os::close(fd);
3722 return JNI_ENOMEM;
3723 }
3724
3725 memset(buf, 0, bytes_alloc);
3726
3727 // Fill buffer
3728 // Use ::read() instead of os::read because os::read()
3729 // might do a thread state transition
3730 // and it is too early for that here
3731
3732 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3733 os::close(fd);
3734 if (bytes_read < 0) {
3735 FREE_C_HEAP_ARRAY(char, buf);
3736 jio_fprintf(defaultStream::error_stream(),
3737 "Could not read options file '%s'\n", file_name);
3738 return JNI_ERR;
3739 }
3740
3741 if (bytes_read == 0) {
3742 // tell caller there is no option data and that is ok
3743 FREE_C_HEAP_ARRAY(char, buf);
3744 return JNI_OK;
3745 }
3746
3747 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3748
3749 FREE_C_HEAP_ARRAY(char, buf);
3750 return retcode;
3751 }
3752
3753 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3754 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3755
3756 // some pointers to help with parsing
3757 char *buffer_end = buffer + buf_len;
3758 char *opt_hd = buffer;
3759 char *wrt = buffer;
3760 char *rd = buffer;
3761
3762 // parse all options
3763 while (rd < buffer_end) {
3764 // skip leading white space from the input string
3765 while (rd < buffer_end && isspace(*rd)) {
3766 rd++;
3767 }
3768
3769 if (rd >= buffer_end) {
3770 break;
3771 }
3772
3773 // Remember this is where we found the head of the token.
3774 opt_hd = wrt;
3775
3776 // Tokens are strings of non white space characters separated
3777 // by one or more white spaces.
3778 while (rd < buffer_end && !isspace(*rd)) {
3779 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3780 int quote = *rd; // matching quote to look for
3781 rd++; // don't copy open quote
3782 while (rd < buffer_end && *rd != quote) {
3783 // include everything (even spaces)
3784 // up until the close quote
3785 *wrt++ = *rd++; // copy to option string
3786 }
3787
3788 if (rd < buffer_end) {
3789 rd++; // don't copy close quote
3790 } else {
3791 // did not see closing quote
3792 jio_fprintf(defaultStream::error_stream(),
3793 "Unmatched quote in %s\n", name);
3794 delete options;
3795 return JNI_ERR;
3796 }
3797 } else {
3798 *wrt++ = *rd++; // copy to option string
3799 }
3800 }
3801
3802 // steal a white space character and set it to NULL
3803 *wrt++ = '\0';
3804 // We now have a complete token
3805
3806 JavaVMOption option;
3807 option.optionString = opt_hd;
3808 option.extraInfo = NULL;
3809
3810 options->append(option); // Fill in option
3811
3812 rd++; // Advance to next character
3813 }
3814
3815 // Fill out JavaVMInitArgs structure.
3816 jint status = vm_args->set_args(options);
3817
3818 delete options;
3819 return status;
3820 }
3821
3822 void Arguments::set_shared_spaces_flags() {
3823 if (DumpSharedSpaces) {
3824 if (Arguments::get_xpatchprefix() != NULL) {
3825 vm_exit_during_initialization(
3826 "Cannot use the following option when dumping the shared archive", "-Xpatch");
3827 }
3828
3829 if (RequireSharedSpaces) {
3830 warning("Cannot dump shared archive while using shared archive");
3831 }
3832 UseSharedSpaces = false;
3833 #ifdef _LP64
3834 if (!UseCompressedOops || !UseCompressedClassPointers) {
3835 vm_exit_during_initialization(
3836 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3837 }
3838 } else {
3839 if (!UseCompressedOops || !UseCompressedClassPointers) {
3840 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3841 }
3842 #endif
3843 }
3844 }
3845
3846 // Sharing support
3847 // Construct the path to the archive
3848 static char* get_shared_archive_path() {
3849 char *shared_archive_path;
3850 if (SharedArchiveFile == NULL) {
3851 char jvm_path[JVM_MAXPATHLEN];
3852 os::jvm_path(jvm_path, sizeof(jvm_path));
3853 char *end = strrchr(jvm_path, *os::file_separator());
3854 if (end != NULL) *end = '\0';
3855 size_t jvm_path_len = strlen(jvm_path);
3856 size_t file_sep_len = strlen(os::file_separator());
3857 const size_t len = jvm_path_len + file_sep_len + 20;
3858 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3859 if (shared_archive_path != NULL) {
3860 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3861 jvm_path, os::file_separator());
3862 }
3863 } else {
3864 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3865 }
3866 return shared_archive_path;
3867 }
3868
3869 #ifndef PRODUCT
3870 // Determine whether LogVMOutput should be implicitly turned on.
3871 static bool use_vm_log() {
3872 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3873 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3874 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3875 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3876 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3877 return true;
3878 }
3879
3880 #ifdef COMPILER1
3881 if (PrintC1Statistics) {
3882 return true;
3883 }
3884 #endif // COMPILER1
3885
3886 #ifdef COMPILER2
3887 if (PrintOptoAssembly || PrintOptoStatistics) {
3888 return true;
3889 }
3890 #endif // COMPILER2
3891
3892 return false;
3893 }
3894
3895 #endif // PRODUCT
3896
3897 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3898 for (int index = 0; index < args->nOptions; index++) {
3899 const JavaVMOption* option = args->options + index;
3900 const char* tail;
3901 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3902 return true;
3903 }
3904 }
3905 return false;
3906 }
3907
3908 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3909 const char* vm_options_file,
3910 const int vm_options_file_pos,
3911 ScopedVMInitArgs* vm_options_file_args,
3912 ScopedVMInitArgs* args_out) {
3913 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3914 if (code != JNI_OK) {
3915 return code;
3916 }
3917
3918 if (vm_options_file_args->get()->nOptions < 1) {
3919 return JNI_OK;
3920 }
3921
3922 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3923 jio_fprintf(defaultStream::error_stream(),
3924 "A VM options file may not refer to a VM options file. "
3925 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3926 "options file '%s' in options container '%s' is an error.\n",
3927 vm_options_file_args->vm_options_file_arg(),
3928 vm_options_file_args->container_name());
3929 return JNI_EINVAL;
3930 }
3931
3932 return args_out->insert(args, vm_options_file_args->get(),
3933 vm_options_file_pos);
3934 }
3935
3936 // Expand -XX:VMOptionsFile found in args_in as needed.
3937 // mod_args and args_out parameters may return values as needed.
3938 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3939 ScopedVMInitArgs* mod_args,
3940 JavaVMInitArgs** args_out) {
3941 jint code = match_special_option_and_act(args_in, mod_args);
3942 if (code != JNI_OK) {
3943 return code;
3944 }
3945
3946 if (mod_args->is_set()) {
3947 // args_in contains -XX:VMOptionsFile and mod_args contains the
3948 // original options from args_in along with the options expanded
3949 // from the VMOptionsFile. Return a short-hand to the caller.
3950 *args_out = mod_args->get();
3951 } else {
3952 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3953 }
3954 return JNI_OK;
3955 }
3956
3957 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3958 ScopedVMInitArgs* args_out) {
3959 // Remaining part of option string
3960 const char* tail;
3961 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3962
3963 for (int index = 0; index < args->nOptions; index++) {
3964 const JavaVMOption* option = args->options + index;
3965 if (ArgumentsExt::process_options(option)) {
3966 continue;
3967 }
3968 if (match_option(option, "-XX:Flags=", &tail)) {
3969 Arguments::set_jvm_flags_file(tail);
3970 continue;
3971 }
3972 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3973 if (vm_options_file_args.found_vm_options_file_arg()) {
3974 jio_fprintf(defaultStream::error_stream(),
3975 "The option '%s' is already specified in the options "
3976 "container '%s' so the specification of '%s' in the "
3977 "same options container is an error.\n",
3978 vm_options_file_args.vm_options_file_arg(),
3979 vm_options_file_args.container_name(),
3980 option->optionString);
3981 return JNI_EINVAL;
3982 }
3983 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3984 // If there's a VMOptionsFile, parse that
3985 jint code = insert_vm_options_file(args, tail, index,
3986 &vm_options_file_args, args_out);
3987 if (code != JNI_OK) {
3988 return code;
3989 }
3990 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3991 if (args_out->is_set()) {
3992 // The VMOptions file inserted some options so switch 'args'
3993 // to the new set of options, and continue processing which
3994 // preserves "last option wins" semantics.
3995 args = args_out->get();
3996 // The first option from the VMOptionsFile replaces the
3997 // current option. So we back track to process the
3998 // replacement option.
3999 index--;
4000 }
4001 continue;
4002 }
4003 if (match_option(option, "-XX:+PrintVMOptions")) {
4004 PrintVMOptions = true;
4005 continue;
4006 }
4007 if (match_option(option, "-XX:-PrintVMOptions")) {
4008 PrintVMOptions = false;
4009 continue;
4010 }
4011 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4012 IgnoreUnrecognizedVMOptions = true;
4013 continue;
4014 }
4015 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4016 IgnoreUnrecognizedVMOptions = false;
4017 continue;
4018 }
4019 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4020 CommandLineFlags::printFlags(tty, false);
4021 vm_exit(0);
4022 }
4023 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4024 #if INCLUDE_NMT
4025 // The launcher did not setup nmt environment variable properly.
4026 if (!MemTracker::check_launcher_nmt_support(tail)) {
4027 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4028 }
4029
4030 // Verify if nmt option is valid.
4031 if (MemTracker::verify_nmt_option()) {
4032 // Late initialization, still in single-threaded mode.
4033 if (MemTracker::tracking_level() >= NMT_summary) {
4034 MemTracker::init();
4035 }
4036 } else {
4037 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4038 }
4039 continue;
4040 #else
4041 jio_fprintf(defaultStream::error_stream(),
4042 "Native Memory Tracking is not supported in this VM\n");
4043 return JNI_ERR;
4044 #endif
4045 }
4046
4047 #ifndef PRODUCT
4048 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4049 CommandLineFlags::printFlags(tty, true);
4050 vm_exit(0);
4051 }
4052 #endif
4053 }
4054 return JNI_OK;
4055 }
4056
4057 static void print_options(const JavaVMInitArgs *args) {
4058 const char* tail;
4059 for (int index = 0; index < args->nOptions; index++) {
4060 const JavaVMOption *option = args->options + index;
4061 if (match_option(option, "-XX:", &tail)) {
4062 logOption(tail);
4063 }
4064 }
4065 }
4066
4067 bool Arguments::handle_deprecated_print_gc_flags() {
4068 if (PrintGC) {
4069 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4070 }
4071 if (PrintGCDetails) {
4072 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4073 }
4074
4075 if (_gc_log_filename != NULL) {
4076 // -Xloggc was used to specify a filename
4077 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4078 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4079 } else if (PrintGC || PrintGCDetails) {
4080 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4081 }
4082 return true;
4083 }
4084
4085 // Parse entry point called from JNI_CreateJavaVM
4086
4087 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4088 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4089
4090 // Initialize ranges, constraints and writeables
4091 CommandLineFlagRangeList::init();
4092 CommandLineFlagConstraintList::init();
4093 CommandLineFlagWriteableList::init();
4094
4095 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4096 const char* hotspotrc = ".hotspotrc";
4097 bool settings_file_specified = false;
4098 bool needs_hotspotrc_warning = false;
4099 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4100 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4101
4102 // Pointers to current working set of containers
4103 JavaVMInitArgs* cur_cmd_args;
4104 JavaVMInitArgs* cur_java_options_args;
4105 JavaVMInitArgs* cur_java_tool_options_args;
4106
4107 // Containers for modified/expanded options
4108 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4109 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4110 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4111
4112
4113 jint code =
4114 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4115 if (code != JNI_OK) {
4116 return code;
4117 }
4118
4119 code = parse_java_options_environment_variable(&initial_java_options_args);
4120 if (code != JNI_OK) {
4121 return code;
4122 }
4123
4124 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4125 &mod_java_tool_options_args,
4126 &cur_java_tool_options_args);
4127 if (code != JNI_OK) {
4128 return code;
4129 }
4130
4131 code = expand_vm_options_as_needed(initial_cmd_args,
4132 &mod_cmd_args,
4133 &cur_cmd_args);
4134 if (code != JNI_OK) {
4135 return code;
4136 }
4137
4138 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4139 &mod_java_options_args,
4140 &cur_java_options_args);
4141 if (code != JNI_OK) {
4142 return code;
4143 }
4144
4145 const char* flags_file = Arguments::get_jvm_flags_file();
4146 settings_file_specified = (flags_file != NULL);
4147
4148 if (IgnoreUnrecognizedVMOptions) {
4149 cur_cmd_args->ignoreUnrecognized = true;
4150 cur_java_tool_options_args->ignoreUnrecognized = true;
4151 cur_java_options_args->ignoreUnrecognized = true;
4152 }
4153
4154 // Parse specified settings file
4155 if (settings_file_specified) {
4156 if (!process_settings_file(flags_file, true,
4157 cur_cmd_args->ignoreUnrecognized)) {
4158 return JNI_EINVAL;
4159 }
4160 } else {
4161 #ifdef ASSERT
4162 // Parse default .hotspotrc settings file
4163 if (!process_settings_file(".hotspotrc", false,
4164 cur_cmd_args->ignoreUnrecognized)) {
4165 return JNI_EINVAL;
4166 }
4167 #else
4168 struct stat buf;
4169 if (os::stat(hotspotrc, &buf) == 0) {
4170 needs_hotspotrc_warning = true;
4171 }
4172 #endif
4173 }
4174
4175 if (PrintVMOptions) {
4176 print_options(cur_java_tool_options_args);
4177 print_options(cur_cmd_args);
4178 print_options(cur_java_options_args);
4179 }
4180
4181 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4182 jint result = parse_vm_init_args(cur_java_tool_options_args,
4183 cur_java_options_args,
4184 cur_cmd_args);
4185
4186 if (result != JNI_OK) {
4187 return result;
4188 }
4189
4190 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4191 SharedArchivePath = get_shared_archive_path();
4192 if (SharedArchivePath == NULL) {
4193 return JNI_ENOMEM;
4194 }
4195
4196 // Set up VerifySharedSpaces
4197 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4198 VerifySharedSpaces = true;
4199 }
4200
4201 // Delay warning until here so that we've had a chance to process
4202 // the -XX:-PrintWarnings flag
4203 if (needs_hotspotrc_warning) {
4204 warning("%s file is present but has been ignored. "
4205 "Run with -XX:Flags=%s to load the file.",
4206 hotspotrc, hotspotrc);
4207 }
4208
4209 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4210 UNSUPPORTED_OPTION(UseLargePages);
4211 #endif
4212
4213 ArgumentsExt::report_unsupported_options();
4214
4215 #ifndef PRODUCT
4216 if (TraceBytecodesAt != 0) {
4217 TraceBytecodes = true;
4218 }
4219 if (CountCompiledCalls) {
4220 if (UseCounterDecay) {
4221 warning("UseCounterDecay disabled because CountCalls is set");
4222 UseCounterDecay = false;
4223 }
4224 }
4225 #endif // PRODUCT
4226
4227 if (ScavengeRootsInCode == 0) {
4228 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4229 warning("Forcing ScavengeRootsInCode non-zero");
4230 }
4231 ScavengeRootsInCode = 1;
4232 }
4233
4234 if (!handle_deprecated_print_gc_flags()) {
4235 return JNI_EINVAL;
4236 }
4237
4238 // Set object alignment values.
4239 set_object_alignment();
4240
4241 #if !INCLUDE_CDS
4242 if (DumpSharedSpaces || RequireSharedSpaces) {
4243 jio_fprintf(defaultStream::error_stream(),
4244 "Shared spaces are not supported in this VM\n");
4245 return JNI_ERR;
4246 }
4247 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4248 warning("Shared spaces are not supported in this VM");
4249 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4250 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4251 }
4252 no_shared_spaces("CDS Disabled");
4253 #endif // INCLUDE_CDS
4254
4255 return JNI_OK;
4256 }
4257
4258 jint Arguments::apply_ergo() {
4259
4260 // Set flags based on ergonomics.
4261 set_ergonomics_flags();
4262
4263 set_shared_spaces_flags();
4264
4265 // Check the GC selections again.
4266 if (!check_gc_consistency()) {
4267 return JNI_EINVAL;
4268 }
4269
4270 if (TieredCompilation) {
4271 set_tiered_flags();
4272 } else {
4273 int max_compilation_policy_choice = 1;
4274 #ifdef COMPILER2
4275 max_compilation_policy_choice = 2;
4276 #endif
4277 // Check if the policy is valid.
4278 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4279 vm_exit_during_initialization(
4280 "Incompatible compilation policy selected", NULL);
4281 }
4282 // Scale CompileThreshold
4283 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4284 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4285 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4286 }
4287 }
4288
4289 #ifdef COMPILER2
4290 #ifndef PRODUCT
4291 if (PrintIdealGraphLevel > 0) {
4292 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4293 }
4294 #endif
4295 #endif
4296
4297 // Set heap size based on available physical memory
4298 set_heap_size();
4299
4300 ArgumentsExt::set_gc_specific_flags();
4301
4302 // Initialize Metaspace flags and alignments
4303 Metaspace::ergo_initialize();
4304
4305 // Set bytecode rewriting flags
4306 set_bytecode_flags();
4307
4308 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4309 jint code = set_aggressive_opts_flags();
4310 if (code != JNI_OK) {
4311 return code;
4312 }
4313
4314 // Turn off biased locking for locking debug mode flags,
4315 // which are subtly different from each other but neither works with
4316 // biased locking
4317 if (UseHeavyMonitors
4318 #ifdef COMPILER1
4319 || !UseFastLocking
4320 #endif // COMPILER1
4321 #if INCLUDE_JVMCI
4322 || !JVMCIUseFastLocking
4323 #endif
4324 ) {
4325 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4326 // flag set to true on command line; warn the user that they
4327 // can't enable biased locking here
4328 warning("Biased Locking is not supported with locking debug flags"
4329 "; ignoring UseBiasedLocking flag." );
4330 }
4331 UseBiasedLocking = false;
4332 }
4333
4334 #ifdef CC_INTERP
4335 // Clear flags not supported on zero.
4336 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4337 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4338 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4339 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4340 #endif // CC_INTERP
4341
4342 #ifdef COMPILER2
4343 if (!EliminateLocks) {
4344 EliminateNestedLocks = false;
4345 }
4346 if (!Inline) {
4347 IncrementalInline = false;
4348 }
4349 #ifndef PRODUCT
4350 if (!IncrementalInline) {
4351 AlwaysIncrementalInline = false;
4352 }
4353 #endif
4354 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4355 // nothing to use the profiling, turn if off
4356 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4357 }
4358 #endif
4359
4360 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4361 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4362 DebugNonSafepoints = true;
4363 }
4364
4365 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4366 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4367 }
4368
4369 if (UseOnStackReplacement && !UseLoopCounter) {
4370 warning("On-stack-replacement requires loop counters; enabling loop counters");
4371 FLAG_SET_DEFAULT(UseLoopCounter, true);
4372 }
4373
4374 #ifndef PRODUCT
4375 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4376 if (use_vm_log()) {
4377 LogVMOutput = true;
4378 }
4379 }
4380 #endif // PRODUCT
4381
4382 if (PrintCommandLineFlags) {
4383 CommandLineFlags::printSetFlags(tty);
4384 }
4385
4386 // Apply CPU specific policy for the BiasedLocking
4387 if (UseBiasedLocking) {
4388 if (!VM_Version::use_biased_locking() &&
4389 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4390 UseBiasedLocking = false;
4391 }
4392 }
4393 #ifdef COMPILER2
4394 if (!UseBiasedLocking || EmitSync != 0) {
4395 UseOptoBiasInlining = false;
4396 }
4397 #endif
4398
4399 return JNI_OK;
4400 }
4401
4402 jint Arguments::adjust_after_os() {
4403 if (UseNUMA) {
4404 if (UseParallelGC || UseParallelOldGC) {
4405 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4406 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4407 }
4408 }
4409 // UseNUMAInterleaving is set to ON for all collectors and
4410 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4411 // such as the parallel collector for Linux and Solaris will
4412 // interleave old gen and survivor spaces on top of NUMA
4413 // allocation policy for the eden space.
4414 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4415 // all platforms and ParallelGC on Windows will interleave all
4416 // of the heap spaces across NUMA nodes.
4417 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4418 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4419 }
4420 }
4421 return JNI_OK;
4422 }
4423
4424 int Arguments::PropertyList_count(SystemProperty* pl) {
4425 int count = 0;
4426 while(pl != NULL) {
4427 count++;
4428 pl = pl->next();
4429 }
4430 return count;
4431 }
4432
4433 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4434 assert(key != NULL, "just checking");
4435 SystemProperty* prop;
4436 for (prop = pl; prop != NULL; prop = prop->next()) {
4437 if (strcmp(key, prop->key()) == 0) return prop->value();
4438 }
4439 return NULL;
4440 }
4441
4442 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4443 int count = 0;
4444 const char* ret_val = NULL;
4445
4446 while(pl != NULL) {
4447 if(count >= index) {
4448 ret_val = pl->key();
4449 break;
4450 }
4451 count++;
4452 pl = pl->next();
4453 }
4454
4455 return ret_val;
4456 }
4457
4458 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4459 int count = 0;
4460 char* ret_val = NULL;
4461
4462 while(pl != NULL) {
4463 if(count >= index) {
4464 ret_val = pl->value();
4465 break;
4466 }
4467 count++;
4468 pl = pl->next();
4469 }
4470
4471 return ret_val;
4472 }
4473
4474 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4475 SystemProperty* p = *plist;
4476 if (p == NULL) {
4477 *plist = new_p;
4478 } else {
4479 while (p->next() != NULL) {
4480 p = p->next();
4481 }
4482 p->set_next(new_p);
4483 }
4484 }
4485
4486 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4487 if (plist == NULL)
4488 return;
4489
4490 SystemProperty* new_p = new SystemProperty(k, v, true);
4491 PropertyList_add(plist, new_p);
4492 }
4493
4494 void Arguments::PropertyList_add(SystemProperty *element) {
4495 PropertyList_add(&_system_properties, element);
4496 }
4497
4498 // This add maintains unique property key in the list.
4499 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4500 if (plist == NULL)
4501 return;
4502
4503 // If property key exist then update with new value.
4504 SystemProperty* prop;
4505 for (prop = *plist; prop != NULL; prop = prop->next()) {
4506 if (strcmp(k, prop->key()) == 0) {
4507 if (append) {
4508 prop->append_value(v);
4509 } else {
4510 prop->set_writeable_value(v);
4511 }
4512 return;
4513 }
4514 }
4515
4516 PropertyList_add(plist, k, v);
4517 }
4518
4519 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4520 // Returns true if all of the source pointed by src has been copied over to
4521 // the destination buffer pointed by buf. Otherwise, returns false.
4522 // Notes:
4523 // 1. If the length (buflen) of the destination buffer excluding the
4524 // NULL terminator character is not long enough for holding the expanded
4525 // pid characters, it also returns false instead of returning the partially
4526 // expanded one.
4527 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4528 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4529 char* buf, size_t buflen) {
4530 const char* p = src;
4531 char* b = buf;
4532 const char* src_end = &src[srclen];
4533 char* buf_end = &buf[buflen - 1];
4534
4535 while (p < src_end && b < buf_end) {
4536 if (*p == '%') {
4537 switch (*(++p)) {
4538 case '%': // "%%" ==> "%"
4539 *b++ = *p++;
4540 break;
4541 case 'p': { // "%p" ==> current process id
4542 // buf_end points to the character before the last character so
4543 // that we could write '\0' to the end of the buffer.
4544 size_t buf_sz = buf_end - b + 1;
4545 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4546
4547 // if jio_snprintf fails or the buffer is not long enough to hold
4548 // the expanded pid, returns false.
4549 if (ret < 0 || ret >= (int)buf_sz) {
4550 return false;
4551 } else {
4552 b += ret;
4553 assert(*b == '\0', "fail in copy_expand_pid");
4554 if (p == src_end && b == buf_end + 1) {
4555 // reach the end of the buffer.
4556 return true;
4557 }
4558 }
4559 p++;
4560 break;
4561 }
4562 default :
4563 *b++ = '%';
4564 }
4565 } else {
4566 *b++ = *p++;
4567 }
4568 }
4569 *b = '\0';
4570 return (p == src_end); // return false if not all of the source was copied
4571 }