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 }
1645 #endif // INCLUDE_ALL_GCS
1646
1647 void set_object_alignment() {
1648 // Object alignment.
1649 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1650 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1651 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1652 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1653 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1654 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1655
1656 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1657 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1658
1659 // Oop encoding heap max
1660 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1661
1662 if (SurvivorAlignmentInBytes == 0) {
1663 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1664 }
1665
1666 #if INCLUDE_ALL_GCS
1667 // Set CMS global values
1668 CompactibleFreeListSpace::set_cms_values();
1669 #endif // INCLUDE_ALL_GCS
1670 }
1671
1672 size_t Arguments::max_heap_for_compressed_oops() {
1673 // Avoid sign flip.
1674 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1675 // We need to fit both the NULL page and the heap into the memory budget, while
1676 // keeping alignment constraints of the heap. To guarantee the latter, as the
1677 // NULL page is located before the heap, we pad the NULL page to the conservative
1678 // maximum alignment that the GC may ever impose upon the heap.
1679 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1680 _conservative_max_heap_alignment);
1681
1682 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1683 NOT_LP64(ShouldNotReachHere(); return 0);
1684 }
1685
1686 bool Arguments::should_auto_select_low_pause_collector() {
1687 if (UseAutoGCSelectPolicy &&
1688 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1689 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1690 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1691 return true;
1692 }
1693 return false;
1694 }
1695
1696 void Arguments::set_use_compressed_oops() {
1697 #ifndef ZERO
1698 #ifdef _LP64
1699 // MaxHeapSize is not set up properly at this point, but
1700 // the only value that can override MaxHeapSize if we are
1701 // to use UseCompressedOops is InitialHeapSize.
1702 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1703
1704 if (max_heap_size <= max_heap_for_compressed_oops()) {
1705 #if !defined(COMPILER1) || defined(TIERED)
1706 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1707 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1708 }
1709 #endif
1710 } else {
1711 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1712 warning("Max heap size too large for Compressed Oops");
1713 FLAG_SET_DEFAULT(UseCompressedOops, false);
1714 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1715 }
1716 }
1717 #endif // _LP64
1718 #endif // ZERO
1719 }
1720
1721
1722 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1723 // set_use_compressed_oops().
1724 void Arguments::set_use_compressed_klass_ptrs() {
1725 #ifndef ZERO
1726 #ifdef _LP64
1727 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1728 if (!UseCompressedOops) {
1729 if (UseCompressedClassPointers) {
1730 warning("UseCompressedClassPointers requires UseCompressedOops");
1731 }
1732 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1733 } else {
1734 // Turn on UseCompressedClassPointers too
1735 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1736 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1737 }
1738 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1739 if (UseCompressedClassPointers) {
1740 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1741 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1742 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1743 }
1744 }
1745 }
1746 #endif // _LP64
1747 #endif // !ZERO
1748 }
1749
1750 void Arguments::set_conservative_max_heap_alignment() {
1751 // The conservative maximum required alignment for the heap is the maximum of
1752 // the alignments imposed by several sources: any requirements from the heap
1753 // itself, the collector policy and the maximum page size we may run the VM
1754 // with.
1755 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1756 #if INCLUDE_ALL_GCS
1757 if (UseParallelGC) {
1758 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1759 } else if (UseG1GC) {
1760 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1761 }
1762 #endif // INCLUDE_ALL_GCS
1763 _conservative_max_heap_alignment = MAX4(heap_alignment,
1764 (size_t)os::vm_allocation_granularity(),
1765 os::max_page_size(),
1766 CollectorPolicy::compute_heap_alignment());
1767 }
1768
1769 bool Arguments::gc_selected() {
1770 #if INCLUDE_ALL_GCS
1771 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1772 #else
1773 return UseSerialGC;
1774 #endif // INCLUDE_ALL_GCS
1775 }
1776
1777 void Arguments::select_gc_ergonomically() {
1778 #if INCLUDE_ALL_GCS
1779 if (os::is_server_class_machine()) {
1780 if (should_auto_select_low_pause_collector()) {
1781 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1782 } else {
1783 #if defined(JAVASE_EMBEDDED)
1784 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1785 #else
1786 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1787 #endif
1788 }
1789 } else {
1790 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1791 }
1792 #else
1793 UNSUPPORTED_OPTION(UseG1GC);
1794 UNSUPPORTED_OPTION(UseParallelGC);
1795 UNSUPPORTED_OPTION(UseParallelOldGC);
1796 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1797 UNSUPPORTED_OPTION(UseParNewGC);
1798 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1799 #endif // INCLUDE_ALL_GCS
1800 }
1801
1802 void Arguments::select_gc() {
1803 if (!gc_selected()) {
1804 select_gc_ergonomically();
1805 if (!gc_selected()) {
1806 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1807 }
1808 }
1809 }
1810
1811 void Arguments::set_ergonomics_flags() {
1812 select_gc();
1813
1814 #if defined(COMPILER2) || INCLUDE_JVMCI
1815 // Shared spaces work fine with other GCs but causes bytecode rewriting
1816 // to be disabled, which hurts interpreter performance and decreases
1817 // server performance. When -server is specified, keep the default off
1818 // unless it is asked for. Future work: either add bytecode rewriting
1819 // at link time, or rewrite bytecodes in non-shared methods.
1820 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1821 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1822 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1823 }
1824 #endif
1825
1826 set_conservative_max_heap_alignment();
1827
1828 #ifndef ZERO
1829 #ifdef _LP64
1830 set_use_compressed_oops();
1831
1832 // set_use_compressed_klass_ptrs() must be called after calling
1833 // set_use_compressed_oops().
1834 set_use_compressed_klass_ptrs();
1835
1836 // Also checks that certain machines are slower with compressed oops
1837 // in vm_version initialization code.
1838 #endif // _LP64
1839 #endif // !ZERO
1840
1841 CodeCacheExtensions::set_ergonomics_flags();
1842 }
1843
1844 void Arguments::set_parallel_gc_flags() {
1845 assert(UseParallelGC || UseParallelOldGC, "Error");
1846 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1847 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1848 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1849 }
1850 FLAG_SET_DEFAULT(UseParallelGC, true);
1851
1852 // If no heap maximum was requested explicitly, use some reasonable fraction
1853 // of the physical memory, up to a maximum of 1GB.
1854 FLAG_SET_DEFAULT(ParallelGCThreads,
1855 Abstract_VM_Version::parallel_worker_threads());
1856 if (ParallelGCThreads == 0) {
1857 jio_fprintf(defaultStream::error_stream(),
1858 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1859 vm_exit(1);
1860 }
1861
1862 if (UseAdaptiveSizePolicy) {
1863 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1864 // unless the user actually sets these flags.
1865 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1866 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1867 }
1868 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1869 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1870 }
1871 }
1872
1873 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1874 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1875 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1876 // See CR 6362902 for details.
1877 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1878 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1879 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1880 }
1881 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1882 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1883 }
1884 }
1885
1886 if (UseParallelOldGC) {
1887 // Par compact uses lower default values since they are treated as
1888 // minimums. These are different defaults because of the different
1889 // interpretation and are not ergonomically set.
1890 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1891 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1892 }
1893 }
1894 }
1895
1896 void Arguments::set_g1_gc_flags() {
1897 assert(UseG1GC, "Error");
1898 #if defined(COMPILER1) || INCLUDE_JVMCI
1899 FastTLABRefill = false;
1900 #endif
1901 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1902 if (ParallelGCThreads == 0) {
1903 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1904 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1905 }
1906
1907 #if INCLUDE_ALL_GCS
1908 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1909 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1910 }
1911 #endif
1912
1913 // MarkStackSize will be set (if it hasn't been set by the user)
1914 // when concurrent marking is initialized.
1915 // Its value will be based upon the number of parallel marking threads.
1916 // But we do set the maximum mark stack size here.
1917 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1918 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1919 }
1920
1921 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1922 // In G1, we want the default GC overhead goal to be higher than
1923 // it is for PS, or the heap might be expanded too aggressively.
1924 // We set it here to ~8%.
1925 FLAG_SET_DEFAULT(GCTimeRatio, 12);
1926 }
1927
1928 // Below, we might need to calculate the pause time interval based on
1929 // the pause target. When we do so we are going to give G1 maximum
1930 // flexibility and allow it to do pauses when it needs to. So, we'll
1931 // arrange that the pause interval to be pause time target + 1 to
1932 // ensure that a) the pause time target is maximized with respect to
1933 // the pause interval and b) we maintain the invariant that pause
1934 // time target < pause interval. If the user does not want this
1935 // maximum flexibility, they will have to set the pause interval
1936 // explicitly.
1937
1938 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1939 // The default pause time target in G1 is 200ms
1940 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1941 }
1942
1943 // Then, if the interval parameter was not set, set it according to
1944 // the pause time target (this will also deal with the case when the
1945 // pause time target is the default value).
1946 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1947 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1948 }
1949
1950 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1951 }
1952
1953 void Arguments::set_gc_specific_flags() {
1954 #if INCLUDE_ALL_GCS
1955 // Set per-collector flags
1956 if (UseParallelGC || UseParallelOldGC) {
1957 set_parallel_gc_flags();
1958 } else if (UseConcMarkSweepGC) {
1959 set_cms_and_parnew_gc_flags();
1960 } else if (UseG1GC) {
1961 set_g1_gc_flags();
1962 }
1963 if (AssumeMP && !UseSerialGC) {
1964 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1965 warning("If the number of processors is expected to increase from one, then"
1966 " you should configure the number of parallel GC threads appropriately"
1967 " using -XX:ParallelGCThreads=N");
1968 }
1969 }
1970 if (MinHeapFreeRatio == 100) {
1971 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1972 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1973 }
1974 #endif // INCLUDE_ALL_GCS
1975 }
1976
1977 julong Arguments::limit_by_allocatable_memory(julong limit) {
1978 julong max_allocatable;
1979 julong result = limit;
1980 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1981 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1982 }
1983 return result;
1984 }
1985
1986 // Use static initialization to get the default before parsing
1987 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1988
1989 void Arguments::set_heap_size() {
1990 const julong phys_mem =
1991 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1992 : (julong)MaxRAM;
1993
1994 // If the maximum heap size has not been set with -Xmx,
1995 // then set it as fraction of the size of physical memory,
1996 // respecting the maximum and minimum sizes of the heap.
1997 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1998 julong reasonable_max = phys_mem / MaxRAMFraction;
1999
2000 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2001 // Small physical memory, so use a minimum fraction of it for the heap
2002 reasonable_max = phys_mem / MinRAMFraction;
2003 } else {
2004 // Not-small physical memory, so require a heap at least
2005 // as large as MaxHeapSize
2006 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2007 }
2008 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2009 // Limit the heap size to ErgoHeapSizeLimit
2010 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2011 }
2012 if (UseCompressedOops) {
2013 // Limit the heap size to the maximum possible when using compressed oops
2014 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2015
2016 // HeapBaseMinAddress can be greater than default but not less than.
2017 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2018 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2019 // matches compressed oops printing flags
2020 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2021 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2022 DefaultHeapBaseMinAddress,
2023 DefaultHeapBaseMinAddress/G,
2024 HeapBaseMinAddress);
2025 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2026 }
2027 }
2028
2029 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2030 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2031 // but it should be not less than default MaxHeapSize.
2032 max_coop_heap -= HeapBaseMinAddress;
2033 }
2034 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2035 }
2036 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2037
2038 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2039 // An initial heap size was specified on the command line,
2040 // so be sure that the maximum size is consistent. Done
2041 // after call to limit_by_allocatable_memory because that
2042 // method might reduce the allocation size.
2043 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2044 }
2045
2046 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2047 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2048 }
2049
2050 // If the minimum or initial heap_size have not been set or requested to be set
2051 // ergonomically, set them accordingly.
2052 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2053 julong reasonable_minimum = (julong)(OldSize + NewSize);
2054
2055 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2056
2057 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2058
2059 if (InitialHeapSize == 0) {
2060 julong reasonable_initial = phys_mem / InitialRAMFraction;
2061
2062 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2063 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2064
2065 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2066
2067 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2068 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2069 }
2070 // If the minimum heap size has not been set (via -Xms),
2071 // synchronize with InitialHeapSize to avoid errors with the default value.
2072 if (min_heap_size() == 0) {
2073 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2074 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2075 }
2076 }
2077 }
2078
2079 // This option inspects the machine and attempts to set various
2080 // parameters to be optimal for long-running, memory allocation
2081 // intensive jobs. It is intended for machines with large
2082 // amounts of cpu and memory.
2083 jint Arguments::set_aggressive_heap_flags() {
2084 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2085 // VM, but we may not be able to represent the total physical memory
2086 // available (like having 8gb of memory on a box but using a 32bit VM).
2087 // Thus, we need to make sure we're using a julong for intermediate
2088 // calculations.
2089 julong initHeapSize;
2090 julong total_memory = os::physical_memory();
2091
2092 if (total_memory < (julong) 256 * M) {
2093 jio_fprintf(defaultStream::error_stream(),
2094 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2095 vm_exit(1);
2096 }
2097
2098 // The heap size is half of available memory, or (at most)
2099 // all of possible memory less 160mb (leaving room for the OS
2100 // when using ISM). This is the maximum; because adaptive sizing
2101 // is turned on below, the actual space used may be smaller.
2102
2103 initHeapSize = MIN2(total_memory / (julong) 2,
2104 total_memory - (julong) 160 * M);
2105
2106 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2107
2108 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2109 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2110 return JNI_EINVAL;
2111 }
2112 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2113 return JNI_EINVAL;
2114 }
2115 // Currently the minimum size and the initial heap sizes are the same.
2116 set_min_heap_size(initHeapSize);
2117 }
2118 if (FLAG_IS_DEFAULT(NewSize)) {
2119 // Make the young generation 3/8ths of the total heap.
2120 if (FLAG_SET_CMDLINE(size_t, NewSize,
2121 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2122 return JNI_EINVAL;
2123 }
2124 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2125 return JNI_EINVAL;
2126 }
2127 }
2128
2129 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2130 FLAG_SET_DEFAULT(UseLargePages, true);
2131 #endif
2132
2133 // Increase some data structure sizes for efficiency
2134 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2135 return JNI_EINVAL;
2136 }
2137 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2138 return JNI_EINVAL;
2139 }
2140 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2141 return JNI_EINVAL;
2142 }
2143
2144 // See the OldPLABSize comment below, but replace 'after promotion'
2145 // with 'after copying'. YoungPLABSize is the size of the survivor
2146 // space per-gc-thread buffers. The default is 4kw.
2147 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2148 return JNI_EINVAL;
2149 }
2150
2151 // OldPLABSize is the size of the buffers in the old gen that
2152 // UseParallelGC uses to promote live data that doesn't fit in the
2153 // survivor spaces. At any given time, there's one for each gc thread.
2154 // The default size is 1kw. These buffers are rarely used, since the
2155 // survivor spaces are usually big enough. For specjbb, however, there
2156 // are occasions when there's lots of live data in the young gen
2157 // and we end up promoting some of it. We don't have a definite
2158 // explanation for why bumping OldPLABSize helps, but the theory
2159 // is that a bigger PLAB results in retaining something like the
2160 // original allocation order after promotion, which improves mutator
2161 // locality. A minor effect may be that larger PLABs reduce the
2162 // number of PLAB allocation events during gc. The value of 8kw
2163 // was arrived at by experimenting with specjbb.
2164 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2165 return JNI_EINVAL;
2166 }
2167
2168 // Enable parallel GC and adaptive generation sizing
2169 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2170 return JNI_EINVAL;
2171 }
2172 FLAG_SET_DEFAULT(ParallelGCThreads,
2173 Abstract_VM_Version::parallel_worker_threads());
2174
2175 // Encourage steady state memory management
2176 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2177 return JNI_EINVAL;
2178 }
2179
2180 // This appears to improve mutator locality
2181 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2182 return JNI_EINVAL;
2183 }
2184
2185 // Get around early Solaris scheduling bug
2186 // (affinity vs other jobs on system)
2187 // but disallow DR and offlining (5008695).
2188 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2189 return JNI_EINVAL;
2190 }
2191
2192 return JNI_OK;
2193 }
2194
2195 // This must be called after ergonomics.
2196 void Arguments::set_bytecode_flags() {
2197 if (!RewriteBytecodes) {
2198 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2199 }
2200 }
2201
2202 // Aggressive optimization flags -XX:+AggressiveOpts
2203 jint Arguments::set_aggressive_opts_flags() {
2204 #ifdef COMPILER2
2205 if (AggressiveUnboxing) {
2206 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2207 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2208 } else if (!EliminateAutoBox) {
2209 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2210 AggressiveUnboxing = false;
2211 }
2212 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2213 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2214 } else if (!DoEscapeAnalysis) {
2215 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2216 AggressiveUnboxing = false;
2217 }
2218 }
2219 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2220 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2221 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2222 }
2223 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2224 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2225 }
2226
2227 // Feed the cache size setting into the JDK
2228 char buffer[1024];
2229 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2230 if (!add_property(buffer)) {
2231 return JNI_ENOMEM;
2232 }
2233 }
2234 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2235 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2236 }
2237 #endif
2238
2239 if (AggressiveOpts) {
2240 // Sample flag setting code
2241 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2242 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2243 // }
2244 }
2245
2246 return JNI_OK;
2247 }
2248
2249 //===========================================================================================================
2250 // Parsing of java.compiler property
2251
2252 void Arguments::process_java_compiler_argument(const char* arg) {
2253 // For backwards compatibility, Djava.compiler=NONE or ""
2254 // causes us to switch to -Xint mode UNLESS -Xdebug
2255 // is also specified.
2256 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2257 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2258 }
2259 }
2260
2261 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2262 _sun_java_launcher = os::strdup_check_oom(launcher);
2263 }
2264
2265 bool Arguments::created_by_java_launcher() {
2266 assert(_sun_java_launcher != NULL, "property must have value");
2267 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2268 }
2269
2270 bool Arguments::sun_java_launcher_is_altjvm() {
2271 return _sun_java_launcher_is_altjvm;
2272 }
2273
2274 //===========================================================================================================
2275 // Parsing of main arguments
2276
2277 #if INCLUDE_JVMCI
2278 // Check consistency of jvmci vm argument settings.
2279 bool Arguments::check_jvmci_args_consistency() {
2280 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2281 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2282 return false;
2283 }
2284 return true;
2285 }
2286 #endif //INCLUDE_JVMCI
2287
2288 // Check consistency of GC selection
2289 bool Arguments::check_gc_consistency() {
2290 // Ensure that the user has not selected conflicting sets
2291 // of collectors.
2292 uint i = 0;
2293 if (UseSerialGC) i++;
2294 if (UseConcMarkSweepGC) i++;
2295 if (UseParallelGC || UseParallelOldGC) i++;
2296 if (UseG1GC) i++;
2297 if (i > 1) {
2298 jio_fprintf(defaultStream::error_stream(),
2299 "Conflicting collector combinations in option list; "
2300 "please refer to the release notes for the combinations "
2301 "allowed\n");
2302 return false;
2303 }
2304
2305 if (UseConcMarkSweepGC && !UseParNewGC) {
2306 jio_fprintf(defaultStream::error_stream(),
2307 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2308 return false;
2309 }
2310
2311 if (UseParNewGC && !UseConcMarkSweepGC) {
2312 jio_fprintf(defaultStream::error_stream(),
2313 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2314 return false;
2315 }
2316
2317 return true;
2318 }
2319
2320 // Check the consistency of vm_init_args
2321 bool Arguments::check_vm_args_consistency() {
2322 // Method for adding checks for flag consistency.
2323 // The intent is to warn the user of all possible conflicts,
2324 // before returning an error.
2325 // Note: Needs platform-dependent factoring.
2326 bool status = true;
2327
2328 if (TLABRefillWasteFraction == 0) {
2329 jio_fprintf(defaultStream::error_stream(),
2330 "TLABRefillWasteFraction should be a denominator, "
2331 "not " SIZE_FORMAT "\n",
2332 TLABRefillWasteFraction);
2333 status = false;
2334 }
2335
2336 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2337 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2338 }
2339
2340 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2341 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2342 }
2343
2344 if (GCTimeLimit == 100) {
2345 // Turn off gc-overhead-limit-exceeded checks
2346 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2347 }
2348
2349 status = status && check_gc_consistency();
2350
2351 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2352 // insists that we hold the requisite locks so that the iteration is
2353 // MT-safe. For the verification at start-up and shut-down, we don't
2354 // yet have a good way of acquiring and releasing these locks,
2355 // which are not visible at the CollectedHeap level. We want to
2356 // be able to acquire these locks and then do the iteration rather
2357 // than just disable the lock verification. This will be fixed under
2358 // bug 4788986.
2359 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2360 if (VerifyDuringStartup) {
2361 warning("Heap verification at start-up disabled "
2362 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2363 VerifyDuringStartup = false; // Disable verification at start-up
2364 }
2365
2366 if (VerifyBeforeExit) {
2367 warning("Heap verification at shutdown disabled "
2368 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2369 VerifyBeforeExit = false; // Disable verification at shutdown
2370 }
2371 }
2372
2373 if (PrintNMTStatistics) {
2374 #if INCLUDE_NMT
2375 if (MemTracker::tracking_level() == NMT_off) {
2376 #endif // INCLUDE_NMT
2377 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2378 PrintNMTStatistics = false;
2379 #if INCLUDE_NMT
2380 }
2381 #endif
2382 }
2383 #if INCLUDE_JVMCI
2384
2385 status = status && check_jvmci_args_consistency();
2386
2387 if (EnableJVMCI) {
2388 if (!ScavengeRootsInCode) {
2389 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2390 ScavengeRootsInCode = 1;
2391 }
2392 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2393 TypeProfileLevel = 0;
2394 }
2395 if (UseJVMCICompiler) {
2396 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2397 TypeProfileWidth = 8;
2398 }
2399 }
2400 }
2401 #endif
2402
2403 // Check lower bounds of the code cache
2404 // Template Interpreter code is approximately 3X larger in debug builds.
2405 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2406 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2407 jio_fprintf(defaultStream::error_stream(),
2408 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2409 os::vm_page_size()/K);
2410 status = false;
2411 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2412 jio_fprintf(defaultStream::error_stream(),
2413 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2414 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2415 status = false;
2416 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2417 jio_fprintf(defaultStream::error_stream(),
2418 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2419 min_code_cache_size/K);
2420 status = false;
2421 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2422 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2423 jio_fprintf(defaultStream::error_stream(),
2424 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2425 CODE_CACHE_SIZE_LIMIT/M);
2426 status = false;
2427 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2430 min_code_cache_size/K);
2431 status = false;
2432 }
2433
2434 #ifdef _LP64
2435 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2436 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2437 }
2438 #endif
2439
2440 #ifndef SUPPORT_RESERVED_STACK_AREA
2441 if (StackReservedPages != 0) {
2442 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2443 warning("Reserved Stack Area not supported on this platform");
2444 }
2445 #endif
2446
2447 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2448 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2449 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2450 }
2451 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2452 }
2453 if (UseCompiler && is_interpreter_only()) {
2454 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2455 warning("UseCompiler disabled due to -Xint.");
2456 }
2457 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2458 }
2459 #ifdef COMPILER2
2460 if (PostLoopMultiversioning && !RangeCheckElimination) {
2461 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2462 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2463 }
2464 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2465 }
2466 #endif
2467 return status;
2468 }
2469
2470 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2471 const char* option_type) {
2472 if (ignore) return false;
2473
2474 const char* spacer = " ";
2475 if (option_type == NULL) {
2476 option_type = ++spacer; // Set both to the empty string.
2477 }
2478
2479 if (os::obsolete_option(option)) {
2480 jio_fprintf(defaultStream::error_stream(),
2481 "Obsolete %s%soption: %s\n", option_type, spacer,
2482 option->optionString);
2483 return false;
2484 } else {
2485 jio_fprintf(defaultStream::error_stream(),
2486 "Unrecognized %s%soption: %s\n", option_type, spacer,
2487 option->optionString);
2488 return true;
2489 }
2490 }
2491
2492 static const char* user_assertion_options[] = {
2493 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2494 };
2495
2496 static const char* system_assertion_options[] = {
2497 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2498 };
2499
2500 bool Arguments::parse_uintx(const char* value,
2501 uintx* uintx_arg,
2502 uintx min_size) {
2503
2504 // Check the sign first since atojulong() parses only unsigned values.
2505 bool value_is_positive = !(*value == '-');
2506
2507 if (value_is_positive) {
2508 julong n;
2509 bool good_return = atojulong(value, &n);
2510 if (good_return) {
2511 bool above_minimum = n >= min_size;
2512 bool value_is_too_large = n > max_uintx;
2513
2514 if (above_minimum && !value_is_too_large) {
2515 *uintx_arg = n;
2516 return true;
2517 }
2518 }
2519 }
2520 return false;
2521 }
2522
2523 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2524 julong* long_arg,
2525 julong min_size) {
2526 if (!atojulong(s, long_arg)) return arg_unreadable;
2527 return check_memory_size(*long_arg, min_size);
2528 }
2529
2530 // Parse JavaVMInitArgs structure
2531
2532 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2533 const JavaVMInitArgs *java_options_args,
2534 const JavaVMInitArgs *cmd_line_args) {
2535 bool xpatch_javabase = false;
2536
2537 // Save default settings for some mode flags
2538 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2539 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2540 Arguments::_ClipInlining = ClipInlining;
2541 Arguments::_BackgroundCompilation = BackgroundCompilation;
2542 if (TieredCompilation) {
2543 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2544 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2545 }
2546
2547 // Setup flags for mixed which is the default
2548 set_mode_flags(_mixed);
2549
2550 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2551 // variable (if present).
2552 jint result = parse_each_vm_init_arg(java_tool_options_args, &xpatch_javabase, Flag::ENVIRON_VAR);
2553 if (result != JNI_OK) {
2554 return result;
2555 }
2556
2557 // Parse args structure generated from the command line flags.
2558 result = parse_each_vm_init_arg(cmd_line_args, &xpatch_javabase, Flag::COMMAND_LINE);
2559 if (result != JNI_OK) {
2560 return result;
2561 }
2562
2563 // Parse args structure generated from the _JAVA_OPTIONS environment
2564 // variable (if present) (mimics classic VM)
2565 result = parse_each_vm_init_arg(java_options_args, &xpatch_javabase, Flag::ENVIRON_VAR);
2566 if (result != JNI_OK) {
2567 return result;
2568 }
2569
2570 // Do final processing now that all arguments have been parsed
2571 result = finalize_vm_init_args();
2572 if (result != JNI_OK) {
2573 return result;
2574 }
2575
2576 return JNI_OK;
2577 }
2578
2579 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2580 // represents a valid JDWP agent. is_path==true denotes that we
2581 // are dealing with -agentpath (case where name is a path), otherwise with
2582 // -agentlib
2583 bool valid_jdwp_agent(char *name, bool is_path) {
2584 char *_name;
2585 const char *_jdwp = "jdwp";
2586 size_t _len_jdwp, _len_prefix;
2587
2588 if (is_path) {
2589 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2590 return false;
2591 }
2592
2593 _name++; // skip past last path separator
2594 _len_prefix = strlen(JNI_LIB_PREFIX);
2595
2596 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2597 return false;
2598 }
2599
2600 _name += _len_prefix;
2601 _len_jdwp = strlen(_jdwp);
2602
2603 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2604 _name += _len_jdwp;
2605 }
2606 else {
2607 return false;
2608 }
2609
2610 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2611 return false;
2612 }
2613
2614 return true;
2615 }
2616
2617 if (strcmp(name, _jdwp) == 0) {
2618 return true;
2619 }
2620
2621 return false;
2622 }
2623
2624 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* xpatch_javabase, Flag::Flags origin) {
2625 // For match_option to return remaining or value part of option string
2626 const char* tail;
2627
2628 // iterate over arguments
2629 for (int index = 0; index < args->nOptions; index++) {
2630 bool is_absolute_path = false; // for -agentpath vs -agentlib
2631
2632 const JavaVMOption* option = args->options + index;
2633
2634 if (!match_option(option, "-Djava.class.path", &tail) &&
2635 !match_option(option, "-Dsun.java.command", &tail) &&
2636 !match_option(option, "-Dsun.java.launcher", &tail)) {
2637
2638 // add all jvm options to the jvm_args string. This string
2639 // is used later to set the java.vm.args PerfData string constant.
2640 // the -Djava.class.path and the -Dsun.java.command options are
2641 // omitted from jvm_args string as each have their own PerfData
2642 // string constant object.
2643 build_jvm_args(option->optionString);
2644 }
2645
2646 // -verbose:[class/gc/jni]
2647 if (match_option(option, "-verbose", &tail)) {
2648 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2649 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2650 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2651 } else if (!strcmp(tail, ":gc")) {
2652 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2653 } else if (!strcmp(tail, ":jni")) {
2654 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2655 return JNI_EINVAL;
2656 }
2657 }
2658 // -da / -ea / -disableassertions / -enableassertions
2659 // These accept an optional class/package name separated by a colon, e.g.,
2660 // -da:java.lang.Thread.
2661 } else if (match_option(option, user_assertion_options, &tail, true)) {
2662 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2663 if (*tail == '\0') {
2664 JavaAssertions::setUserClassDefault(enable);
2665 } else {
2666 assert(*tail == ':', "bogus match by match_option()");
2667 JavaAssertions::addOption(tail + 1, enable);
2668 }
2669 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2670 } else if (match_option(option, system_assertion_options, &tail, false)) {
2671 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2672 JavaAssertions::setSystemClassDefault(enable);
2673 // -bootclasspath:
2674 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2675 jio_fprintf(defaultStream::output_stream(),
2676 "-Xbootclasspath is no longer a supported option.\n");
2677 return JNI_EINVAL;
2678 // -bootclasspath/a:
2679 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2680 Arguments::set_bootclassloader_append_index((int)strlen(Arguments::get_sysclasspath())+1);
2681 Arguments::append_sysclasspath(tail);
2682 // -bootclasspath/p:
2683 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2684 jio_fprintf(defaultStream::output_stream(),
2685 "-Xbootclasspath/p is no longer a supported option.\n");
2686 return JNI_EINVAL;
2687 // -Xrun
2688 } else if (match_option(option, "-Xrun", &tail)) {
2689 if (tail != NULL) {
2690 const char* pos = strchr(tail, ':');
2691 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2692 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2693 name[len] = '\0';
2694
2695 char *options = NULL;
2696 if(pos != NULL) {
2697 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2698 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2699 }
2700 #if !INCLUDE_JVMTI
2701 if (strcmp(name, "jdwp") == 0) {
2702 jio_fprintf(defaultStream::error_stream(),
2703 "Debugging agents are not supported in this VM\n");
2704 return JNI_ERR;
2705 }
2706 #endif // !INCLUDE_JVMTI
2707 add_init_library(name, options);
2708 }
2709 // -agentlib and -agentpath
2710 } else if (match_option(option, "-agentlib:", &tail) ||
2711 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2712 if(tail != NULL) {
2713 const char* pos = strchr(tail, '=');
2714 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2715 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2716 name[len] = '\0';
2717
2718 char *options = NULL;
2719 if(pos != NULL) {
2720 options = os::strdup_check_oom(pos + 1, mtArguments);
2721 }
2722 #if !INCLUDE_JVMTI
2723 if (valid_jdwp_agent(name, is_absolute_path)) {
2724 jio_fprintf(defaultStream::error_stream(),
2725 "Debugging agents are not supported in this VM\n");
2726 return JNI_ERR;
2727 }
2728 #endif // !INCLUDE_JVMTI
2729 add_init_agent(name, options, is_absolute_path);
2730 }
2731 // -javaagent
2732 } else if (match_option(option, "-javaagent:", &tail)) {
2733 #if !INCLUDE_JVMTI
2734 jio_fprintf(defaultStream::error_stream(),
2735 "Instrumentation agents are not supported in this VM\n");
2736 return JNI_ERR;
2737 #else
2738 if (tail != NULL) {
2739 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2740 add_init_agent("instrument", options, false);
2741 // java agents need module java.instrument
2742 if (!Arguments::append_to_addmods_property("java.instrument")) {
2743 return JNI_ENOMEM;
2744 }
2745 }
2746 #endif // !INCLUDE_JVMTI
2747 // -Xnoclassgc
2748 } else if (match_option(option, "-Xnoclassgc")) {
2749 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 // -Xconcgc
2753 } else if (match_option(option, "-Xconcgc")) {
2754 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2755 return JNI_EINVAL;
2756 }
2757 // -Xnoconcgc
2758 } else if (match_option(option, "-Xnoconcgc")) {
2759 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 // -Xbatch
2763 } else if (match_option(option, "-Xbatch")) {
2764 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2765 return JNI_EINVAL;
2766 }
2767 // -Xmn for compatibility with other JVM vendors
2768 } else if (match_option(option, "-Xmn", &tail)) {
2769 julong long_initial_young_size = 0;
2770 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2771 if (errcode != arg_in_range) {
2772 jio_fprintf(defaultStream::error_stream(),
2773 "Invalid initial young generation size: %s\n", option->optionString);
2774 describe_range_error(errcode);
2775 return JNI_EINVAL;
2776 }
2777 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 // -Xms
2784 } else if (match_option(option, "-Xms", &tail)) {
2785 julong long_initial_heap_size = 0;
2786 // an initial heap size of 0 means automatically determine
2787 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2788 if (errcode != arg_in_range) {
2789 jio_fprintf(defaultStream::error_stream(),
2790 "Invalid initial heap size: %s\n", option->optionString);
2791 describe_range_error(errcode);
2792 return JNI_EINVAL;
2793 }
2794 set_min_heap_size((size_t)long_initial_heap_size);
2795 // Currently the minimum size and the initial heap sizes are the same.
2796 // Can be overridden with -XX:InitialHeapSize.
2797 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 // -Xmx
2801 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2802 julong long_max_heap_size = 0;
2803 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2804 if (errcode != arg_in_range) {
2805 jio_fprintf(defaultStream::error_stream(),
2806 "Invalid maximum heap size: %s\n", option->optionString);
2807 describe_range_error(errcode);
2808 return JNI_EINVAL;
2809 }
2810 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2811 return JNI_EINVAL;
2812 }
2813 // Xmaxf
2814 } else if (match_option(option, "-Xmaxf", &tail)) {
2815 char* err;
2816 int maxf = (int)(strtod(tail, &err) * 100);
2817 if (*err != '\0' || *tail == '\0') {
2818 jio_fprintf(defaultStream::error_stream(),
2819 "Bad max heap free percentage size: %s\n",
2820 option->optionString);
2821 return JNI_EINVAL;
2822 } else {
2823 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2824 return JNI_EINVAL;
2825 }
2826 }
2827 // Xminf
2828 } else if (match_option(option, "-Xminf", &tail)) {
2829 char* err;
2830 int minf = (int)(strtod(tail, &err) * 100);
2831 if (*err != '\0' || *tail == '\0') {
2832 jio_fprintf(defaultStream::error_stream(),
2833 "Bad min heap free percentage size: %s\n",
2834 option->optionString);
2835 return JNI_EINVAL;
2836 } else {
2837 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2838 return JNI_EINVAL;
2839 }
2840 }
2841 // -Xss
2842 } else if (match_option(option, "-Xss", &tail)) {
2843 julong long_ThreadStackSize = 0;
2844 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2845 if (errcode != arg_in_range) {
2846 jio_fprintf(defaultStream::error_stream(),
2847 "Invalid thread stack size: %s\n", option->optionString);
2848 describe_range_error(errcode);
2849 return JNI_EINVAL;
2850 }
2851 // Internally track ThreadStackSize in units of 1024 bytes.
2852 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2853 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2857 } else if (match_option(option, "-Xoss", &tail) ||
2858 match_option(option, "-Xsqnopause") ||
2859 match_option(option, "-Xoptimize") ||
2860 match_option(option, "-Xboundthreads") ||
2861 match_option(option, "-Xusealtsigs")) {
2862 // All these options are deprecated in JDK 9 and will be removed in a future release
2863 char version[256];
2864 JDK_Version::jdk(9).to_string(version, sizeof(version));
2865 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2866 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2867 julong long_CodeCacheExpansionSize = 0;
2868 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2869 if (errcode != arg_in_range) {
2870 jio_fprintf(defaultStream::error_stream(),
2871 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2872 os::vm_page_size()/K);
2873 return JNI_EINVAL;
2874 }
2875 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2876 return JNI_EINVAL;
2877 }
2878 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2879 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2880 julong long_ReservedCodeCacheSize = 0;
2881
2882 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2883 if (errcode != arg_in_range) {
2884 jio_fprintf(defaultStream::error_stream(),
2885 "Invalid maximum code cache size: %s.\n", option->optionString);
2886 return JNI_EINVAL;
2887 }
2888 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2889 return JNI_EINVAL;
2890 }
2891 // -XX:NonNMethodCodeHeapSize=
2892 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2893 julong long_NonNMethodCodeHeapSize = 0;
2894
2895 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2896 if (errcode != arg_in_range) {
2897 jio_fprintf(defaultStream::error_stream(),
2898 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2899 return JNI_EINVAL;
2900 }
2901 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2902 return JNI_EINVAL;
2903 }
2904 // -XX:ProfiledCodeHeapSize=
2905 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2906 julong long_ProfiledCodeHeapSize = 0;
2907
2908 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2909 if (errcode != arg_in_range) {
2910 jio_fprintf(defaultStream::error_stream(),
2911 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2912 return JNI_EINVAL;
2913 }
2914 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 // -XX:NonProfiledCodeHeapSizee=
2918 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2919 julong long_NonProfiledCodeHeapSize = 0;
2920
2921 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2922 if (errcode != arg_in_range) {
2923 jio_fprintf(defaultStream::error_stream(),
2924 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2925 return JNI_EINVAL;
2926 }
2927 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2928 return JNI_EINVAL;
2929 }
2930 // -green
2931 } else if (match_option(option, "-green")) {
2932 jio_fprintf(defaultStream::error_stream(),
2933 "Green threads support not available\n");
2934 return JNI_EINVAL;
2935 // -native
2936 } else if (match_option(option, "-native")) {
2937 // HotSpot always uses native threads, ignore silently for compatibility
2938 // -Xrs
2939 } else if (match_option(option, "-Xrs")) {
2940 // Classic/EVM option, new functionality
2941 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2942 return JNI_EINVAL;
2943 }
2944 // -Xprof
2945 } else if (match_option(option, "-Xprof")) {
2946 #if INCLUDE_FPROF
2947 _has_profile = true;
2948 #else // INCLUDE_FPROF
2949 jio_fprintf(defaultStream::error_stream(),
2950 "Flat profiling is not supported in this VM.\n");
2951 return JNI_ERR;
2952 #endif // INCLUDE_FPROF
2953 // -Xconcurrentio
2954 } else if (match_option(option, "-Xconcurrentio")) {
2955 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2965 return JNI_EINVAL;
2966 }
2967 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2968 return JNI_EINVAL;
2969 }
2970
2971 // -Xinternalversion
2972 } else if (match_option(option, "-Xinternalversion")) {
2973 jio_fprintf(defaultStream::output_stream(), "%s\n",
2974 VM_Version::internal_vm_info_string());
2975 vm_exit(0);
2976 #ifndef PRODUCT
2977 // -Xprintflags
2978 } else if (match_option(option, "-Xprintflags")) {
2979 CommandLineFlags::printFlags(tty, false);
2980 vm_exit(0);
2981 #endif
2982 // -D
2983 } else if (match_option(option, "-D", &tail)) {
2984 const char* value;
2985 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2986 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2987 // abort if -Djava.endorsed.dirs is set
2988 jio_fprintf(defaultStream::output_stream(),
2989 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2990 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2991 return JNI_EINVAL;
2992 }
2993 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2994 *value != '\0' && strcmp(value, "\"\"") != 0) {
2995 // abort if -Djava.ext.dirs is set
2996 jio_fprintf(defaultStream::output_stream(),
2997 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2998 return JNI_EINVAL;
2999 }
3000
3001 if (!add_property(tail)) {
3002 return JNI_ENOMEM;
3003 }
3004 // Out of the box management support
3005 if (match_option(option, "-Dcom.sun.management", &tail)) {
3006 #if INCLUDE_MANAGEMENT
3007 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 // management agent in module java.management
3011 if (!Arguments::append_to_addmods_property("java.management")) {
3012 return JNI_ENOMEM;
3013 }
3014 #else
3015 jio_fprintf(defaultStream::output_stream(),
3016 "-Dcom.sun.management is not supported in this VM.\n");
3017 return JNI_ERR;
3018 #endif
3019 }
3020 if (match_option(option, "-Djdk.launcher.patch.", &tail)) {
3021 // -Djdk.launcher.patch.#=<module>=<file>(<pathsep><file>)*
3022 // The number, #, specified will be increasing with each -Xpatch
3023 // specified on the command line.
3024 // Pick up module name, following the -D property's equal sign.
3025 const char* property_equal = strchr(tail, '=');
3026 if (property_equal == NULL) {
3027 jio_fprintf(defaultStream::output_stream(), "Missing '=' in -Xpatch specification\n");
3028 return JNI_ERR;
3029 } else {
3030 // Find the equal sign between the module name and the path specification
3031 const char* module_equal = strchr(property_equal + 1, '=');
3032 if (module_equal == NULL) {
3033 jio_fprintf(defaultStream::output_stream(), "Bad value for -Xpatch, no module name specified\n");
3034 return JNI_ERR;
3035 } else {
3036 // Pick out the module name, in between the two equal signs
3037 size_t module_len = module_equal - property_equal - 1;
3038 char* module_name = NEW_C_HEAP_ARRAY(char, module_len+1, mtArguments);
3039 memcpy(module_name, property_equal + 1, module_len);
3040 *(module_name + module_len) = '\0';
3041 // The path piece begins one past the module_equal sign
3042 Arguments::add_xpatchprefix(module_name, module_equal + 1, xpatch_javabase);
3043 FREE_C_HEAP_ARRAY(char, module_name);
3044 }
3045 }
3046 }
3047 // -Xint
3048 } else if (match_option(option, "-Xint")) {
3049 set_mode_flags(_int);
3050 // -Xmixed
3051 } else if (match_option(option, "-Xmixed")) {
3052 set_mode_flags(_mixed);
3053 // -Xcomp
3054 } else if (match_option(option, "-Xcomp")) {
3055 // for testing the compiler; turn off all flags that inhibit compilation
3056 set_mode_flags(_comp);
3057 // -Xshare:dump
3058 } else if (match_option(option, "-Xshare:dump")) {
3059 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3060 return JNI_EINVAL;
3061 }
3062 set_mode_flags(_int); // Prevent compilation, which creates objects
3063 // -Xshare:on
3064 } else if (match_option(option, "-Xshare:on")) {
3065 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3069 return JNI_EINVAL;
3070 }
3071 // -Xshare:auto
3072 } else if (match_option(option, "-Xshare:auto")) {
3073 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3074 return JNI_EINVAL;
3075 }
3076 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3077 return JNI_EINVAL;
3078 }
3079 // -Xshare:off
3080 } else if (match_option(option, "-Xshare:off")) {
3081 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3082 return JNI_EINVAL;
3083 }
3084 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3085 return JNI_EINVAL;
3086 }
3087 // -Xverify
3088 } else if (match_option(option, "-Xverify", &tail)) {
3089 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3090 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3091 return JNI_EINVAL;
3092 }
3093 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3094 return JNI_EINVAL;
3095 }
3096 } else if (strcmp(tail, ":remote") == 0) {
3097 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3098 return JNI_EINVAL;
3099 }
3100 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3101 return JNI_EINVAL;
3102 }
3103 } else if (strcmp(tail, ":none") == 0) {
3104 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3105 return JNI_EINVAL;
3106 }
3107 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3108 return JNI_EINVAL;
3109 }
3110 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3111 return JNI_EINVAL;
3112 }
3113 // -Xdebug
3114 } else if (match_option(option, "-Xdebug")) {
3115 // note this flag has been used, then ignore
3116 set_xdebug_mode(true);
3117 // -Xnoagent
3118 } else if (match_option(option, "-Xnoagent")) {
3119 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3120 } else if (match_option(option, "-Xloggc:", &tail)) {
3121 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3122 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3123 _gc_log_filename = os::strdup_check_oom(tail);
3124 } else if (match_option(option, "-Xlog", &tail)) {
3125 bool ret = false;
3126 if (strcmp(tail, ":help") == 0) {
3127 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3128 vm_exit(0);
3129 } else if (strcmp(tail, ":disable") == 0) {
3130 LogConfiguration::disable_logging();
3131 ret = true;
3132 } else if (*tail == '\0') {
3133 ret = LogConfiguration::parse_command_line_arguments();
3134 assert(ret, "-Xlog without arguments should never fail to parse");
3135 } else if (*tail == ':') {
3136 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3137 }
3138 if (ret == false) {
3139 jio_fprintf(defaultStream::error_stream(),
3140 "Invalid -Xlog option '-Xlog%s'\n",
3141 tail);
3142 return JNI_EINVAL;
3143 }
3144 // JNI hooks
3145 } else if (match_option(option, "-Xcheck", &tail)) {
3146 if (!strcmp(tail, ":jni")) {
3147 #if !INCLUDE_JNI_CHECK
3148 warning("JNI CHECKING is not supported in this VM");
3149 #else
3150 CheckJNICalls = true;
3151 #endif // INCLUDE_JNI_CHECK
3152 } else if (is_bad_option(option, args->ignoreUnrecognized,
3153 "check")) {
3154 return JNI_EINVAL;
3155 }
3156 } else if (match_option(option, "vfprintf")) {
3157 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3158 } else if (match_option(option, "exit")) {
3159 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3160 } else if (match_option(option, "abort")) {
3161 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3162 // -XX:+AggressiveHeap
3163 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3164 jint result = set_aggressive_heap_flags();
3165 if (result != JNI_OK) {
3166 return result;
3167 }
3168 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3169 // and the last option wins.
3170 } else if (match_option(option, "-XX:+NeverTenure")) {
3171 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3175 return JNI_EINVAL;
3176 }
3177 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3181 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3182 return JNI_EINVAL;
3183 }
3184 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3185 return JNI_EINVAL;
3186 }
3187 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3188 return JNI_EINVAL;
3189 }
3190 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3191 uintx max_tenuring_thresh = 0;
3192 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3193 jio_fprintf(defaultStream::error_stream(),
3194 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3195 return JNI_EINVAL;
3196 }
3197
3198 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3199 return JNI_EINVAL;
3200 }
3201
3202 if (MaxTenuringThreshold == 0) {
3203 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3207 return JNI_EINVAL;
3208 }
3209 } else {
3210 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3211 return JNI_EINVAL;
3212 }
3213 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3214 return JNI_EINVAL;
3215 }
3216 }
3217 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3218 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3219 return JNI_EINVAL;
3220 }
3221 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3222 return JNI_EINVAL;
3223 }
3224 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3225 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3226 return JNI_EINVAL;
3227 }
3228 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3229 return JNI_EINVAL;
3230 }
3231 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3232 #if defined(DTRACE_ENABLED)
3233 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3234 return JNI_EINVAL;
3235 }
3236 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3237 return JNI_EINVAL;
3238 }
3239 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3240 return JNI_EINVAL;
3241 }
3242 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3243 return JNI_EINVAL;
3244 }
3245 #else // defined(DTRACE_ENABLED)
3246 jio_fprintf(defaultStream::error_stream(),
3247 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3248 return JNI_EINVAL;
3249 #endif // defined(DTRACE_ENABLED)
3250 #ifdef ASSERT
3251 } else if (match_option(option, "-XX:+FullGCALot")) {
3252 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3253 return JNI_EINVAL;
3254 }
3255 // disable scavenge before parallel mark-compact
3256 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3257 return JNI_EINVAL;
3258 }
3259 #endif
3260 #if !INCLUDE_MANAGEMENT
3261 } else if (match_option(option, "-XX:+ManagementServer")) {
3262 jio_fprintf(defaultStream::error_stream(),
3263 "ManagementServer is not supported in this VM.\n");
3264 return JNI_ERR;
3265 #endif // INCLUDE_MANAGEMENT
3266 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3267 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3268 // already been handled
3269 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3270 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3271 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3272 return JNI_EINVAL;
3273 }
3274 }
3275 // Unknown option
3276 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3277 return JNI_ERR;
3278 }
3279 }
3280
3281 // PrintSharedArchiveAndExit will turn on
3282 // -Xshare:on
3283 // -Xlog:class+path=info
3284 if (PrintSharedArchiveAndExit) {
3285 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3286 return JNI_EINVAL;
3287 }
3288 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3289 return JNI_EINVAL;
3290 }
3291 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3292 }
3293
3294 // Change the default value for flags which have different default values
3295 // when working with older JDKs.
3296 #ifdef LINUX
3297 if (JDK_Version::current().compare_major(6) <= 0 &&
3298 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3299 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3300 }
3301 #endif // LINUX
3302 fix_appclasspath();
3303 return JNI_OK;
3304 }
3305
3306 void Arguments::add_xpatchprefix(const char* module_name, const char* path, bool* xpatch_javabase) {
3307 // For java.base check for duplicate -Xpatch options being specified on the command line.
3308 // This check is only required for java.base, all other duplicate module specifications
3309 // will be checked during module system initialization. The module system initialization
3310 // will throw an ExceptionInInitializerError if this situation occurs.
3311 if (strcmp(module_name, "java.base") == 0) {
3312 if (*xpatch_javabase) {
3313 vm_exit_during_initialization("Cannot specify java.base more than once to -Xpatch");
3314 } else {
3315 *xpatch_javabase = true;
3316 }
3317 }
3318
3319 // Create GrowableArray lazily, only if -Xpatch has been specified
3320 if (_xpatchprefix == NULL) {
3321 _xpatchprefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModuleXPatchPath*>(10, true);
3322 }
3323
3324 _xpatchprefix->push(new ModuleXPatchPath(module_name, path));
3325 }
3326
3327 // Set property jdk.boot.class.path.append to the contents of the bootclasspath
3328 // that follows either the jimage file or exploded module directories. The
3329 // property will contain -Xbootclasspath/a and/or jvmti appended additions.
3330 void Arguments::set_jdkbootclasspath_append() {
3331 char *sysclasspath = get_sysclasspath();
3332 assert(sysclasspath != NULL, "NULL sysclasspath");
3333 int bcp_a_idx = bootclassloader_append_index();
3334 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) {
3335 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx);
3336 }
3337 }
3338
3339 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3340 //
3341 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3342 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3343 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3344 // path is treated as the current directory.
3345 //
3346 // This causes problems with CDS, which requires that all directories specified in the classpath
3347 // must be empty. In most cases, applications do NOT want to load classes from the current
3348 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3349 // scripts compatible with CDS.
3350 void Arguments::fix_appclasspath() {
3351 if (IgnoreEmptyClassPaths) {
3352 const char separator = *os::path_separator();
3353 const char* src = _java_class_path->value();
3354
3355 // skip over all the leading empty paths
3356 while (*src == separator) {
3357 src ++;
3358 }
3359
3360 char* copy = os::strdup_check_oom(src, mtArguments);
3361
3362 // trim all trailing empty paths
3363 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3364 *tail = '\0';
3365 }
3366
3367 char from[3] = {separator, separator, '\0'};
3368 char to [2] = {separator, '\0'};
3369 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3370 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3371 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3372 }
3373
3374 _java_class_path->set_writeable_value(copy);
3375 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3376 }
3377 }
3378
3379 static bool has_jar_files(const char* directory) {
3380 DIR* dir = os::opendir(directory);
3381 if (dir == NULL) return false;
3382
3383 struct dirent *entry;
3384 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3385 bool hasJarFile = false;
3386 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3387 const char* name = entry->d_name;
3388 const char* ext = name + strlen(name) - 4;
3389 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3390 }
3391 FREE_C_HEAP_ARRAY(char, dbuf);
3392 os::closedir(dir);
3393 return hasJarFile ;
3394 }
3395
3396 static int check_non_empty_dirs(const char* path) {
3397 const char separator = *os::path_separator();
3398 const char* const end = path + strlen(path);
3399 int nonEmptyDirs = 0;
3400 while (path < end) {
3401 const char* tmp_end = strchr(path, separator);
3402 if (tmp_end == NULL) {
3403 if (has_jar_files(path)) {
3404 nonEmptyDirs++;
3405 jio_fprintf(defaultStream::output_stream(),
3406 "Non-empty directory: %s\n", path);
3407 }
3408 path = end;
3409 } else {
3410 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3411 memcpy(dirpath, path, tmp_end - path);
3412 dirpath[tmp_end - path] = '\0';
3413 if (has_jar_files(dirpath)) {
3414 nonEmptyDirs++;
3415 jio_fprintf(defaultStream::output_stream(),
3416 "Non-empty directory: %s\n", dirpath);
3417 }
3418 FREE_C_HEAP_ARRAY(char, dirpath);
3419 path = tmp_end + 1;
3420 }
3421 }
3422 return nonEmptyDirs;
3423 }
3424
3425 jint Arguments::finalize_vm_init_args() {
3426 // check if the default lib/endorsed directory exists; if so, error
3427 char path[JVM_MAXPATHLEN];
3428 const char* fileSep = os::file_separator();
3429 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3430
3431 if (CheckEndorsedAndExtDirs) {
3432 int nonEmptyDirs = 0;
3433 // check endorsed directory
3434 nonEmptyDirs += check_non_empty_dirs(path);
3435 // check the extension directories
3436 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3437 if (nonEmptyDirs > 0) {
3438 return JNI_ERR;
3439 }
3440 }
3441
3442 DIR* dir = os::opendir(path);
3443 if (dir != NULL) {
3444 jio_fprintf(defaultStream::output_stream(),
3445 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3446 "in modular form will be supported via the concept of upgradeable modules.\n");
3447 os::closedir(dir);
3448 return JNI_ERR;
3449 }
3450
3451 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3452 dir = os::opendir(path);
3453 if (dir != NULL) {
3454 jio_fprintf(defaultStream::output_stream(),
3455 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3456 "Use -classpath instead.\n.");
3457 os::closedir(dir);
3458 return JNI_ERR;
3459 }
3460
3461 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1);
3462
3463 // This must be done after all arguments have been processed.
3464 // java_compiler() true means set to "NONE" or empty.
3465 if (java_compiler() && !xdebug_mode()) {
3466 // For backwards compatibility, we switch to interpreted mode if
3467 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3468 // not specified.
3469 set_mode_flags(_int);
3470 }
3471
3472 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3473 // but like -Xint, leave compilation thresholds unaffected.
3474 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3475 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3476 set_mode_flags(_int);
3477 }
3478
3479 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3480 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3481 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3482 }
3483
3484 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3485 // Don't degrade server performance for footprint
3486 if (FLAG_IS_DEFAULT(UseLargePages) &&
3487 MaxHeapSize < LargePageHeapSizeThreshold) {
3488 // No need for large granularity pages w/small heaps.
3489 // Note that large pages are enabled/disabled for both the
3490 // Java heap and the code cache.
3491 FLAG_SET_DEFAULT(UseLargePages, false);
3492 }
3493
3494 #elif defined(COMPILER2)
3495 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3496 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3497 }
3498 #endif
3499
3500 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3501 UNSUPPORTED_OPTION(ProfileInterpreter);
3502 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3503 #endif
3504
3505 #ifndef TIERED
3506 // Tiered compilation is undefined.
3507 UNSUPPORTED_OPTION(TieredCompilation);
3508 #endif
3509
3510 #if INCLUDE_JVMCI
3511 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) {
3512 return JNI_ENOMEM;
3513 }
3514 #endif
3515
3516 // If we are running in a headless jre, force java.awt.headless property
3517 // to be true unless the property has already been set.
3518 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3519 if (os::is_headless_jre()) {
3520 const char* headless = Arguments::get_property("java.awt.headless");
3521 if (headless == NULL) {
3522 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3523 if (headless_env == NULL) {
3524 if (!add_property("java.awt.headless=true")) {
3525 return JNI_ENOMEM;
3526 }
3527 } else {
3528 char buffer[256];
3529 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3530 if (!add_property(buffer)) {
3531 return JNI_ENOMEM;
3532 }
3533 }
3534 }
3535 }
3536
3537 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3538 // CMS can only be used with ParNew
3539 FLAG_SET_ERGO(bool, UseParNewGC, true);
3540 }
3541
3542 if (!check_vm_args_consistency()) {
3543 return JNI_ERR;
3544 }
3545
3546 return JNI_OK;
3547 }
3548
3549 // Helper class for controlling the lifetime of JavaVMInitArgs
3550 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3551 // deleted on the destruction of the ScopedVMInitArgs object.
3552 class ScopedVMInitArgs : public StackObj {
3553 private:
3554 JavaVMInitArgs _args;
3555 char* _container_name;
3556 bool _is_set;
3557 char* _vm_options_file_arg;
3558
3559 public:
3560 ScopedVMInitArgs(const char *container_name) {
3561 _args.version = JNI_VERSION_1_2;
3562 _args.nOptions = 0;
3563 _args.options = NULL;
3564 _args.ignoreUnrecognized = false;
3565 _container_name = (char *)container_name;
3566 _is_set = false;
3567 _vm_options_file_arg = NULL;
3568 }
3569
3570 // Populates the JavaVMInitArgs object represented by this
3571 // ScopedVMInitArgs object with the arguments in options. The
3572 // allocated memory is deleted by the destructor. If this method
3573 // returns anything other than JNI_OK, then this object is in a
3574 // partially constructed state, and should be abandoned.
3575 jint set_args(GrowableArray<JavaVMOption>* options) {
3576 _is_set = true;
3577 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3578 JavaVMOption, options->length(), mtArguments);
3579 if (options_arr == NULL) {
3580 return JNI_ENOMEM;
3581 }
3582 _args.options = options_arr;
3583
3584 for (int i = 0; i < options->length(); i++) {
3585 options_arr[i] = options->at(i);
3586 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3587 if (options_arr[i].optionString == NULL) {
3588 // Rely on the destructor to do cleanup.
3589 _args.nOptions = i;
3590 return JNI_ENOMEM;
3591 }
3592 }
3593
3594 _args.nOptions = options->length();
3595 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3596 return JNI_OK;
3597 }
3598
3599 JavaVMInitArgs* get() { return &_args; }
3600 char* container_name() { return _container_name; }
3601 bool is_set() { return _is_set; }
3602 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3603 char* vm_options_file_arg() { return _vm_options_file_arg; }
3604
3605 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3606 if (_vm_options_file_arg != NULL) {
3607 os::free(_vm_options_file_arg);
3608 }
3609 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3610 }
3611
3612 ~ScopedVMInitArgs() {
3613 if (_vm_options_file_arg != NULL) {
3614 os::free(_vm_options_file_arg);
3615 }
3616 if (_args.options == NULL) return;
3617 for (int i = 0; i < _args.nOptions; i++) {
3618 os::free(_args.options[i].optionString);
3619 }
3620 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3621 }
3622
3623 // Insert options into this option list, to replace option at
3624 // vm_options_file_pos (-XX:VMOptionsFile)
3625 jint insert(const JavaVMInitArgs* args,
3626 const JavaVMInitArgs* args_to_insert,
3627 const int vm_options_file_pos) {
3628 assert(_args.options == NULL, "shouldn't be set yet");
3629 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3630 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3631
3632 int length = args->nOptions + args_to_insert->nOptions - 1;
3633 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3634 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3635 for (int i = 0; i < args->nOptions; i++) {
3636 if (i == vm_options_file_pos) {
3637 // insert the new options starting at the same place as the
3638 // -XX:VMOptionsFile option
3639 for (int j = 0; j < args_to_insert->nOptions; j++) {
3640 options->push(args_to_insert->options[j]);
3641 }
3642 } else {
3643 options->push(args->options[i]);
3644 }
3645 }
3646 // make into options array
3647 jint result = set_args(options);
3648 delete options;
3649 return result;
3650 }
3651 };
3652
3653 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3654 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3655 }
3656
3657 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3658 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3659 }
3660
3661 jint Arguments::parse_options_environment_variable(const char* name,
3662 ScopedVMInitArgs* vm_args) {
3663 char *buffer = ::getenv(name);
3664
3665 // Don't check this environment variable if user has special privileges
3666 // (e.g. unix su command).
3667 if (buffer == NULL || os::have_special_privileges()) {
3668 return JNI_OK;
3669 }
3670
3671 if ((buffer = os::strdup(buffer)) == NULL) {
3672 return JNI_ENOMEM;
3673 }
3674
3675 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3676
3677 os::free(buffer);
3678 return retcode;
3679 }
3680
3681 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3682 // read file into buffer
3683 int fd = ::open(file_name, O_RDONLY);
3684 if (fd < 0) {
3685 jio_fprintf(defaultStream::error_stream(),
3686 "Could not open options file '%s'\n",
3687 file_name);
3688 return JNI_ERR;
3689 }
3690
3691 struct stat stbuf;
3692 int retcode = os::stat(file_name, &stbuf);
3693 if (retcode != 0) {
3694 jio_fprintf(defaultStream::error_stream(),
3695 "Could not stat options file '%s'\n",
3696 file_name);
3697 os::close(fd);
3698 return JNI_ERR;
3699 }
3700
3701 if (stbuf.st_size == 0) {
3702 // tell caller there is no option data and that is ok
3703 os::close(fd);
3704 return JNI_OK;
3705 }
3706
3707 // '+ 1' for NULL termination even with max bytes
3708 size_t bytes_alloc = stbuf.st_size + 1;
3709
3710 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3711 if (NULL == buf) {
3712 jio_fprintf(defaultStream::error_stream(),
3713 "Could not allocate read buffer for options file parse\n");
3714 os::close(fd);
3715 return JNI_ENOMEM;
3716 }
3717
3718 memset(buf, 0, bytes_alloc);
3719
3720 // Fill buffer
3721 // Use ::read() instead of os::read because os::read()
3722 // might do a thread state transition
3723 // and it is too early for that here
3724
3725 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3726 os::close(fd);
3727 if (bytes_read < 0) {
3728 FREE_C_HEAP_ARRAY(char, buf);
3729 jio_fprintf(defaultStream::error_stream(),
3730 "Could not read options file '%s'\n", file_name);
3731 return JNI_ERR;
3732 }
3733
3734 if (bytes_read == 0) {
3735 // tell caller there is no option data and that is ok
3736 FREE_C_HEAP_ARRAY(char, buf);
3737 return JNI_OK;
3738 }
3739
3740 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3741
3742 FREE_C_HEAP_ARRAY(char, buf);
3743 return retcode;
3744 }
3745
3746 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3747 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3748
3749 // some pointers to help with parsing
3750 char *buffer_end = buffer + buf_len;
3751 char *opt_hd = buffer;
3752 char *wrt = buffer;
3753 char *rd = buffer;
3754
3755 // parse all options
3756 while (rd < buffer_end) {
3757 // skip leading white space from the input string
3758 while (rd < buffer_end && isspace(*rd)) {
3759 rd++;
3760 }
3761
3762 if (rd >= buffer_end) {
3763 break;
3764 }
3765
3766 // Remember this is where we found the head of the token.
3767 opt_hd = wrt;
3768
3769 // Tokens are strings of non white space characters separated
3770 // by one or more white spaces.
3771 while (rd < buffer_end && !isspace(*rd)) {
3772 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3773 int quote = *rd; // matching quote to look for
3774 rd++; // don't copy open quote
3775 while (rd < buffer_end && *rd != quote) {
3776 // include everything (even spaces)
3777 // up until the close quote
3778 *wrt++ = *rd++; // copy to option string
3779 }
3780
3781 if (rd < buffer_end) {
3782 rd++; // don't copy close quote
3783 } else {
3784 // did not see closing quote
3785 jio_fprintf(defaultStream::error_stream(),
3786 "Unmatched quote in %s\n", name);
3787 delete options;
3788 return JNI_ERR;
3789 }
3790 } else {
3791 *wrt++ = *rd++; // copy to option string
3792 }
3793 }
3794
3795 // steal a white space character and set it to NULL
3796 *wrt++ = '\0';
3797 // We now have a complete token
3798
3799 JavaVMOption option;
3800 option.optionString = opt_hd;
3801 option.extraInfo = NULL;
3802
3803 options->append(option); // Fill in option
3804
3805 rd++; // Advance to next character
3806 }
3807
3808 // Fill out JavaVMInitArgs structure.
3809 jint status = vm_args->set_args(options);
3810
3811 delete options;
3812 return status;
3813 }
3814
3815 void Arguments::set_shared_spaces_flags() {
3816 if (DumpSharedSpaces) {
3817 if (Arguments::get_xpatchprefix() != NULL) {
3818 vm_exit_during_initialization(
3819 "Cannot use the following option when dumping the shared archive", "-Xpatch");
3820 }
3821
3822 if (RequireSharedSpaces) {
3823 warning("Cannot dump shared archive while using shared archive");
3824 }
3825 UseSharedSpaces = false;
3826 #ifdef _LP64
3827 if (!UseCompressedOops || !UseCompressedClassPointers) {
3828 vm_exit_during_initialization(
3829 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3830 }
3831 } else {
3832 if (!UseCompressedOops || !UseCompressedClassPointers) {
3833 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3834 }
3835 #endif
3836 }
3837 }
3838
3839 // Sharing support
3840 // Construct the path to the archive
3841 static char* get_shared_archive_path() {
3842 char *shared_archive_path;
3843 if (SharedArchiveFile == NULL) {
3844 char jvm_path[JVM_MAXPATHLEN];
3845 os::jvm_path(jvm_path, sizeof(jvm_path));
3846 char *end = strrchr(jvm_path, *os::file_separator());
3847 if (end != NULL) *end = '\0';
3848 size_t jvm_path_len = strlen(jvm_path);
3849 size_t file_sep_len = strlen(os::file_separator());
3850 const size_t len = jvm_path_len + file_sep_len + 20;
3851 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3852 if (shared_archive_path != NULL) {
3853 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3854 jvm_path, os::file_separator());
3855 }
3856 } else {
3857 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3858 }
3859 return shared_archive_path;
3860 }
3861
3862 #ifndef PRODUCT
3863 // Determine whether LogVMOutput should be implicitly turned on.
3864 static bool use_vm_log() {
3865 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3866 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3867 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3868 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3869 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3870 return true;
3871 }
3872
3873 #ifdef COMPILER1
3874 if (PrintC1Statistics) {
3875 return true;
3876 }
3877 #endif // COMPILER1
3878
3879 #ifdef COMPILER2
3880 if (PrintOptoAssembly || PrintOptoStatistics) {
3881 return true;
3882 }
3883 #endif // COMPILER2
3884
3885 return false;
3886 }
3887
3888 #endif // PRODUCT
3889
3890 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3891 for (int index = 0; index < args->nOptions; index++) {
3892 const JavaVMOption* option = args->options + index;
3893 const char* tail;
3894 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3895 return true;
3896 }
3897 }
3898 return false;
3899 }
3900
3901 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3902 const char* vm_options_file,
3903 const int vm_options_file_pos,
3904 ScopedVMInitArgs* vm_options_file_args,
3905 ScopedVMInitArgs* args_out) {
3906 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3907 if (code != JNI_OK) {
3908 return code;
3909 }
3910
3911 if (vm_options_file_args->get()->nOptions < 1) {
3912 return JNI_OK;
3913 }
3914
3915 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3916 jio_fprintf(defaultStream::error_stream(),
3917 "A VM options file may not refer to a VM options file. "
3918 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3919 "options file '%s' in options container '%s' is an error.\n",
3920 vm_options_file_args->vm_options_file_arg(),
3921 vm_options_file_args->container_name());
3922 return JNI_EINVAL;
3923 }
3924
3925 return args_out->insert(args, vm_options_file_args->get(),
3926 vm_options_file_pos);
3927 }
3928
3929 // Expand -XX:VMOptionsFile found in args_in as needed.
3930 // mod_args and args_out parameters may return values as needed.
3931 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3932 ScopedVMInitArgs* mod_args,
3933 JavaVMInitArgs** args_out) {
3934 jint code = match_special_option_and_act(args_in, mod_args);
3935 if (code != JNI_OK) {
3936 return code;
3937 }
3938
3939 if (mod_args->is_set()) {
3940 // args_in contains -XX:VMOptionsFile and mod_args contains the
3941 // original options from args_in along with the options expanded
3942 // from the VMOptionsFile. Return a short-hand to the caller.
3943 *args_out = mod_args->get();
3944 } else {
3945 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3946 }
3947 return JNI_OK;
3948 }
3949
3950 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3951 ScopedVMInitArgs* args_out) {
3952 // Remaining part of option string
3953 const char* tail;
3954 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3955
3956 for (int index = 0; index < args->nOptions; index++) {
3957 const JavaVMOption* option = args->options + index;
3958 if (ArgumentsExt::process_options(option)) {
3959 continue;
3960 }
3961 if (match_option(option, "-XX:Flags=", &tail)) {
3962 Arguments::set_jvm_flags_file(tail);
3963 continue;
3964 }
3965 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3966 if (vm_options_file_args.found_vm_options_file_arg()) {
3967 jio_fprintf(defaultStream::error_stream(),
3968 "The option '%s' is already specified in the options "
3969 "container '%s' so the specification of '%s' in the "
3970 "same options container is an error.\n",
3971 vm_options_file_args.vm_options_file_arg(),
3972 vm_options_file_args.container_name(),
3973 option->optionString);
3974 return JNI_EINVAL;
3975 }
3976 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3977 // If there's a VMOptionsFile, parse that
3978 jint code = insert_vm_options_file(args, tail, index,
3979 &vm_options_file_args, args_out);
3980 if (code != JNI_OK) {
3981 return code;
3982 }
3983 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3984 if (args_out->is_set()) {
3985 // The VMOptions file inserted some options so switch 'args'
3986 // to the new set of options, and continue processing which
3987 // preserves "last option wins" semantics.
3988 args = args_out->get();
3989 // The first option from the VMOptionsFile replaces the
3990 // current option. So we back track to process the
3991 // replacement option.
3992 index--;
3993 }
3994 continue;
3995 }
3996 if (match_option(option, "-XX:+PrintVMOptions")) {
3997 PrintVMOptions = true;
3998 continue;
3999 }
4000 if (match_option(option, "-XX:-PrintVMOptions")) {
4001 PrintVMOptions = false;
4002 continue;
4003 }
4004 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4005 IgnoreUnrecognizedVMOptions = true;
4006 continue;
4007 }
4008 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4009 IgnoreUnrecognizedVMOptions = false;
4010 continue;
4011 }
4012 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4013 CommandLineFlags::printFlags(tty, false);
4014 vm_exit(0);
4015 }
4016 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4017 #if INCLUDE_NMT
4018 // The launcher did not setup nmt environment variable properly.
4019 if (!MemTracker::check_launcher_nmt_support(tail)) {
4020 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4021 }
4022
4023 // Verify if nmt option is valid.
4024 if (MemTracker::verify_nmt_option()) {
4025 // Late initialization, still in single-threaded mode.
4026 if (MemTracker::tracking_level() >= NMT_summary) {
4027 MemTracker::init();
4028 }
4029 } else {
4030 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4031 }
4032 continue;
4033 #else
4034 jio_fprintf(defaultStream::error_stream(),
4035 "Native Memory Tracking is not supported in this VM\n");
4036 return JNI_ERR;
4037 #endif
4038 }
4039
4040 #ifndef PRODUCT
4041 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4042 CommandLineFlags::printFlags(tty, true);
4043 vm_exit(0);
4044 }
4045 #endif
4046 }
4047 return JNI_OK;
4048 }
4049
4050 static void print_options(const JavaVMInitArgs *args) {
4051 const char* tail;
4052 for (int index = 0; index < args->nOptions; index++) {
4053 const JavaVMOption *option = args->options + index;
4054 if (match_option(option, "-XX:", &tail)) {
4055 logOption(tail);
4056 }
4057 }
4058 }
4059
4060 bool Arguments::handle_deprecated_print_gc_flags() {
4061 if (PrintGC) {
4062 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4063 }
4064 if (PrintGCDetails) {
4065 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4066 }
4067
4068 if (_gc_log_filename != NULL) {
4069 // -Xloggc was used to specify a filename
4070 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4071 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4072 } else if (PrintGC || PrintGCDetails) {
4073 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4074 }
4075 return true;
4076 }
4077
4078 // Parse entry point called from JNI_CreateJavaVM
4079
4080 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4081 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4082
4083 // Initialize ranges, constraints and writeables
4084 CommandLineFlagRangeList::init();
4085 CommandLineFlagConstraintList::init();
4086 CommandLineFlagWriteableList::init();
4087
4088 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4089 const char* hotspotrc = ".hotspotrc";
4090 bool settings_file_specified = false;
4091 bool needs_hotspotrc_warning = false;
4092 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4093 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4094
4095 // Pointers to current working set of containers
4096 JavaVMInitArgs* cur_cmd_args;
4097 JavaVMInitArgs* cur_java_options_args;
4098 JavaVMInitArgs* cur_java_tool_options_args;
4099
4100 // Containers for modified/expanded options
4101 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4102 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4103 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4104
4105
4106 jint code =
4107 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4108 if (code != JNI_OK) {
4109 return code;
4110 }
4111
4112 code = parse_java_options_environment_variable(&initial_java_options_args);
4113 if (code != JNI_OK) {
4114 return code;
4115 }
4116
4117 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4118 &mod_java_tool_options_args,
4119 &cur_java_tool_options_args);
4120 if (code != JNI_OK) {
4121 return code;
4122 }
4123
4124 code = expand_vm_options_as_needed(initial_cmd_args,
4125 &mod_cmd_args,
4126 &cur_cmd_args);
4127 if (code != JNI_OK) {
4128 return code;
4129 }
4130
4131 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4132 &mod_java_options_args,
4133 &cur_java_options_args);
4134 if (code != JNI_OK) {
4135 return code;
4136 }
4137
4138 const char* flags_file = Arguments::get_jvm_flags_file();
4139 settings_file_specified = (flags_file != NULL);
4140
4141 if (IgnoreUnrecognizedVMOptions) {
4142 cur_cmd_args->ignoreUnrecognized = true;
4143 cur_java_tool_options_args->ignoreUnrecognized = true;
4144 cur_java_options_args->ignoreUnrecognized = true;
4145 }
4146
4147 // Parse specified settings file
4148 if (settings_file_specified) {
4149 if (!process_settings_file(flags_file, true,
4150 cur_cmd_args->ignoreUnrecognized)) {
4151 return JNI_EINVAL;
4152 }
4153 } else {
4154 #ifdef ASSERT
4155 // Parse default .hotspotrc settings file
4156 if (!process_settings_file(".hotspotrc", false,
4157 cur_cmd_args->ignoreUnrecognized)) {
4158 return JNI_EINVAL;
4159 }
4160 #else
4161 struct stat buf;
4162 if (os::stat(hotspotrc, &buf) == 0) {
4163 needs_hotspotrc_warning = true;
4164 }
4165 #endif
4166 }
4167
4168 if (PrintVMOptions) {
4169 print_options(cur_java_tool_options_args);
4170 print_options(cur_cmd_args);
4171 print_options(cur_java_options_args);
4172 }
4173
4174 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4175 jint result = parse_vm_init_args(cur_java_tool_options_args,
4176 cur_java_options_args,
4177 cur_cmd_args);
4178
4179 if (result != JNI_OK) {
4180 return result;
4181 }
4182
4183 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4184 SharedArchivePath = get_shared_archive_path();
4185 if (SharedArchivePath == NULL) {
4186 return JNI_ENOMEM;
4187 }
4188
4189 // Set up VerifySharedSpaces
4190 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4191 VerifySharedSpaces = true;
4192 }
4193
4194 // Delay warning until here so that we've had a chance to process
4195 // the -XX:-PrintWarnings flag
4196 if (needs_hotspotrc_warning) {
4197 warning("%s file is present but has been ignored. "
4198 "Run with -XX:Flags=%s to load the file.",
4199 hotspotrc, hotspotrc);
4200 }
4201
4202 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4203 UNSUPPORTED_OPTION(UseLargePages);
4204 #endif
4205
4206 ArgumentsExt::report_unsupported_options();
4207
4208 #ifndef PRODUCT
4209 if (TraceBytecodesAt != 0) {
4210 TraceBytecodes = true;
4211 }
4212 if (CountCompiledCalls) {
4213 if (UseCounterDecay) {
4214 warning("UseCounterDecay disabled because CountCalls is set");
4215 UseCounterDecay = false;
4216 }
4217 }
4218 #endif // PRODUCT
4219
4220 if (ScavengeRootsInCode == 0) {
4221 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4222 warning("Forcing ScavengeRootsInCode non-zero");
4223 }
4224 ScavengeRootsInCode = 1;
4225 }
4226
4227 if (!handle_deprecated_print_gc_flags()) {
4228 return JNI_EINVAL;
4229 }
4230
4231 // Set object alignment values.
4232 set_object_alignment();
4233
4234 #if !INCLUDE_CDS
4235 if (DumpSharedSpaces || RequireSharedSpaces) {
4236 jio_fprintf(defaultStream::error_stream(),
4237 "Shared spaces are not supported in this VM\n");
4238 return JNI_ERR;
4239 }
4240 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4241 warning("Shared spaces are not supported in this VM");
4242 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4243 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4244 }
4245 no_shared_spaces("CDS Disabled");
4246 #endif // INCLUDE_CDS
4247
4248 return JNI_OK;
4249 }
4250
4251 jint Arguments::apply_ergo() {
4252
4253 // Set flags based on ergonomics.
4254 set_ergonomics_flags();
4255
4256 set_shared_spaces_flags();
4257
4258 // Check the GC selections again.
4259 if (!check_gc_consistency()) {
4260 return JNI_EINVAL;
4261 }
4262
4263 if (TieredCompilation) {
4264 set_tiered_flags();
4265 } else {
4266 int max_compilation_policy_choice = 1;
4267 #ifdef COMPILER2
4268 max_compilation_policy_choice = 2;
4269 #endif
4270 // Check if the policy is valid.
4271 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4272 vm_exit_during_initialization(
4273 "Incompatible compilation policy selected", NULL);
4274 }
4275 // Scale CompileThreshold
4276 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4277 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4278 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4279 }
4280 }
4281
4282 #ifdef COMPILER2
4283 #ifndef PRODUCT
4284 if (PrintIdealGraphLevel > 0) {
4285 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4286 }
4287 #endif
4288 #endif
4289
4290 // Set heap size based on available physical memory
4291 set_heap_size();
4292
4293 ArgumentsExt::set_gc_specific_flags();
4294
4295 // Initialize Metaspace flags and alignments
4296 Metaspace::ergo_initialize();
4297
4298 // Set bytecode rewriting flags
4299 set_bytecode_flags();
4300
4301 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4302 jint code = set_aggressive_opts_flags();
4303 if (code != JNI_OK) {
4304 return code;
4305 }
4306
4307 // Turn off biased locking for locking debug mode flags,
4308 // which are subtly different from each other but neither works with
4309 // biased locking
4310 if (UseHeavyMonitors
4311 #ifdef COMPILER1
4312 || !UseFastLocking
4313 #endif // COMPILER1
4314 #if INCLUDE_JVMCI
4315 || !JVMCIUseFastLocking
4316 #endif
4317 ) {
4318 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4319 // flag set to true on command line; warn the user that they
4320 // can't enable biased locking here
4321 warning("Biased Locking is not supported with locking debug flags"
4322 "; ignoring UseBiasedLocking flag." );
4323 }
4324 UseBiasedLocking = false;
4325 }
4326
4327 #ifdef CC_INTERP
4328 // Clear flags not supported on zero.
4329 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4330 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4331 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4332 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4333 #endif // CC_INTERP
4334
4335 #ifdef COMPILER2
4336 if (!EliminateLocks) {
4337 EliminateNestedLocks = false;
4338 }
4339 if (!Inline) {
4340 IncrementalInline = false;
4341 }
4342 #ifndef PRODUCT
4343 if (!IncrementalInline) {
4344 AlwaysIncrementalInline = false;
4345 }
4346 #endif
4347 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4348 // nothing to use the profiling, turn if off
4349 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4350 }
4351 #endif
4352
4353 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4354 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4355 DebugNonSafepoints = true;
4356 }
4357
4358 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4359 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4360 }
4361
4362 if (UseOnStackReplacement && !UseLoopCounter) {
4363 warning("On-stack-replacement requires loop counters; enabling loop counters");
4364 FLAG_SET_DEFAULT(UseLoopCounter, true);
4365 }
4366
4367 #ifndef PRODUCT
4368 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4369 if (use_vm_log()) {
4370 LogVMOutput = true;
4371 }
4372 }
4373 #endif // PRODUCT
4374
4375 if (PrintCommandLineFlags) {
4376 CommandLineFlags::printSetFlags(tty);
4377 }
4378
4379 // Apply CPU specific policy for the BiasedLocking
4380 if (UseBiasedLocking) {
4381 if (!VM_Version::use_biased_locking() &&
4382 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4383 UseBiasedLocking = false;
4384 }
4385 }
4386 #ifdef COMPILER2
4387 if (!UseBiasedLocking || EmitSync != 0) {
4388 UseOptoBiasInlining = false;
4389 }
4390 #endif
4391
4392 return JNI_OK;
4393 }
4394
4395 jint Arguments::adjust_after_os() {
4396 if (UseNUMA) {
4397 if (UseParallelGC || UseParallelOldGC) {
4398 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4399 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4400 }
4401 }
4402 // UseNUMAInterleaving is set to ON for all collectors and
4403 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4404 // such as the parallel collector for Linux and Solaris will
4405 // interleave old gen and survivor spaces on top of NUMA
4406 // allocation policy for the eden space.
4407 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4408 // all platforms and ParallelGC on Windows will interleave all
4409 // of the heap spaces across NUMA nodes.
4410 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4411 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4412 }
4413 }
4414 return JNI_OK;
4415 }
4416
4417 int Arguments::PropertyList_count(SystemProperty* pl) {
4418 int count = 0;
4419 while(pl != NULL) {
4420 count++;
4421 pl = pl->next();
4422 }
4423 return count;
4424 }
4425
4426 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4427 assert(key != NULL, "just checking");
4428 SystemProperty* prop;
4429 for (prop = pl; prop != NULL; prop = prop->next()) {
4430 if (strcmp(key, prop->key()) == 0) return prop->value();
4431 }
4432 return NULL;
4433 }
4434
4435 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4436 int count = 0;
4437 const char* ret_val = NULL;
4438
4439 while(pl != NULL) {
4440 if(count >= index) {
4441 ret_val = pl->key();
4442 break;
4443 }
4444 count++;
4445 pl = pl->next();
4446 }
4447
4448 return ret_val;
4449 }
4450
4451 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4452 int count = 0;
4453 char* ret_val = NULL;
4454
4455 while(pl != NULL) {
4456 if(count >= index) {
4457 ret_val = pl->value();
4458 break;
4459 }
4460 count++;
4461 pl = pl->next();
4462 }
4463
4464 return ret_val;
4465 }
4466
4467 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4468 SystemProperty* p = *plist;
4469 if (p == NULL) {
4470 *plist = new_p;
4471 } else {
4472 while (p->next() != NULL) {
4473 p = p->next();
4474 }
4475 p->set_next(new_p);
4476 }
4477 }
4478
4479 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4480 if (plist == NULL)
4481 return;
4482
4483 SystemProperty* new_p = new SystemProperty(k, v, true);
4484 PropertyList_add(plist, new_p);
4485 }
4486
4487 void Arguments::PropertyList_add(SystemProperty *element) {
4488 PropertyList_add(&_system_properties, element);
4489 }
4490
4491 // This add maintains unique property key in the list.
4492 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4493 if (plist == NULL)
4494 return;
4495
4496 // If property key exist then update with new value.
4497 SystemProperty* prop;
4498 for (prop = *plist; prop != NULL; prop = prop->next()) {
4499 if (strcmp(k, prop->key()) == 0) {
4500 if (append) {
4501 prop->append_value(v);
4502 } else {
4503 prop->set_writeable_value(v);
4504 }
4505 return;
4506 }
4507 }
4508
4509 PropertyList_add(plist, k, v);
4510 }
4511
4512 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4513 // Returns true if all of the source pointed by src has been copied over to
4514 // the destination buffer pointed by buf. Otherwise, returns false.
4515 // Notes:
4516 // 1. If the length (buflen) of the destination buffer excluding the
4517 // NULL terminator character is not long enough for holding the expanded
4518 // pid characters, it also returns false instead of returning the partially
4519 // expanded one.
4520 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4521 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4522 char* buf, size_t buflen) {
4523 const char* p = src;
4524 char* b = buf;
4525 const char* src_end = &src[srclen];
4526 char* buf_end = &buf[buflen - 1];
4527
4528 while (p < src_end && b < buf_end) {
4529 if (*p == '%') {
4530 switch (*(++p)) {
4531 case '%': // "%%" ==> "%"
4532 *b++ = *p++;
4533 break;
4534 case 'p': { // "%p" ==> current process id
4535 // buf_end points to the character before the last character so
4536 // that we could write '\0' to the end of the buffer.
4537 size_t buf_sz = buf_end - b + 1;
4538 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4539
4540 // if jio_snprintf fails or the buffer is not long enough to hold
4541 // the expanded pid, returns false.
4542 if (ret < 0 || ret >= (int)buf_sz) {
4543 return false;
4544 } else {
4545 b += ret;
4546 assert(*b == '\0', "fail in copy_expand_pid");
4547 if (p == src_end && b == buf_end + 1) {
4548 // reach the end of the buffer.
4549 return true;
4550 }
4551 }
4552 p++;
4553 break;
4554 }
4555 default :
4556 *b++ = '%';
4557 }
4558 } else {
4559 *b++ = *p++;
4560 }
4561 }
4562 *b = '\0';
4563 return (p == src_end); // return false if not all of the source was copied
4564 }