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